release 2.6

(for pre-extracted native libs in NetBeans)

.gitbugtraq

@@ -0,0 +1,8 @@
+# links issue numbers in git commit messages to issue tracker 
+# https://github.com/mstrap/bugtraq
+# for SmartGit - https://www.syntevo.com/smartgit/
+
+[bugtraq]
+url = "https://github.com/JFormDesigner/FlatLaf/issues/%BUGID%"
+loglinkregex = "#[0-9]{1,5}"
+logregex = "[0-9]{1,5}"

.github/workflows/ci.yml

@@ -19,45 +19,36 @@ jobs:
     strategy:
       matrix:
         # test against
-        # - Java 1.8 (minimum requirement)
-        # - Java 9 (first version with JPMS)
+        # - Java 8 (minimum requirement)
         # - Java LTS versions (11, 17, ...)
         # - lastest Java version(s)
         java:
-          - 1.8
-          - 9
+          - 8
           - 11  # LTS
-          - 14
-          - 15
+          - 17  # LTS
+        toolchain: [""]
+        include:
+          - java: 17
+            toolchain: 19  # latest
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - uses: gradle/wrapper-validation-action@v1
+        if: matrix.java == '8'
 
       - name: Setup Java ${{ matrix.java }}
-        uses: actions/setup-java@v1
+        uses: actions/setup-java@v3
         with:
           java-version: ${{ matrix.java }}
-
-      - name: Cache Gradle wrapper
-        uses: actions/cache@v1
-        with:
-          path: ~/.gradle/wrapper
-          key: ${{ runner.os }}-gradle-wrapper-${{ hashFiles('gradle/wrapper/gradle-wrapper.properties') }}
-
-      - name: Cache Gradle cache
-        uses: actions/cache@v2
-        with:
-          path: ~/.gradle/caches
-          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle.kts') }}
-          restore-keys: ${{ runner.os }}-gradle
+          distribution: adopt  # Java 8 and 11 are pre-installed on ubuntu-latest
+          cache: gradle
 
       - name: Build with Gradle
-        run: ./gradlew build
+        run: ./gradlew build -Dtoolchain=${{ matrix.toolchain }}
 
       - name: Upload artifacts
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         if: matrix.java == '11'
         with:
           name: FlatLaf-build-artifacts
@@ -72,36 +63,36 @@ jobs:
     needs: build
     if: |
       github.event_name == 'push' &&
-      github.ref == 'refs/heads/main' &&
+      (github.ref == 'refs/heads/main' || startsWith( github.ref, 'refs/heads/develop-' )) &&
       github.repository == 'JFormDesigner/FlatLaf'
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - name: Setup Java 11
-        uses: actions/setup-java@v1
+        uses: actions/setup-java@v3
         with:
           java-version: 11
-
-      - name: Cache Gradle wrapper
-        uses: actions/cache@v1
-        with:
-          path: ~/.gradle/wrapper
-          key: ${{ runner.os }}-gradle-wrapper-${{ hashFiles('gradle/wrapper/gradle-wrapper.properties') }}
-
-      - name: Cache Gradle cache
-        uses: actions/cache@v2
-        with:
-          path: ~/.gradle/caches
-          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle.kts') }}
-          restore-keys: ${{ runner.os }}-gradle
+          distribution: adopt  # pre-installed on ubuntu-latest
+          cache: gradle
 
       - name: Publish snapshot to oss.sonatype.org
-        run: ./gradlew publish -Dorg.gradle.internal.publish.checksums.insecure=true
+        run: ./gradlew publish :flatlaf-theme-editor:build -Dorg.gradle.internal.publish.checksums.insecure=true
         env:
           OSSRH_USERNAME: ${{ secrets.OSSRH_USERNAME }}
           OSSRH_PASSWORD: ${{ secrets.OSSRH_PASSWORD }}
 
+      - name: Upload theme editor
+        uses: sebastianpopp/ftp-action@releases/v2
+        with:
+          host: ${{ secrets.FTP_SERVER }}
+          user: ${{ secrets.FTP_USERNAME }}
+          password: ${{ secrets.FTP_PASSWORD }}
+          forceSsl: true
+          localDir: "flatlaf-theme-editor/build/libs"
+          remoteDir: "snapshots"
+          options: "--only-newer --no-recursion --verbose=1"
+
 
   release:
     runs-on: ubuntu-latest
@@ -112,28 +103,17 @@ jobs:
       github.repository == 'JFormDesigner/FlatLaf'
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - name: Setup Java 11
-        uses: actions/setup-java@v1
+        uses: actions/setup-java@v3
         with:
           java-version: 11
-
-      - name: Cache Gradle wrapper
-        uses: actions/cache@v1
-        with:
-          path: ~/.gradle/wrapper
-          key: ${{ runner.os }}-gradle-wrapper-${{ hashFiles('gradle/wrapper/gradle-wrapper.properties') }}
-
-      - name: Cache Gradle cache
-        uses: actions/cache@v2
-        with:
-          path: ~/.gradle/caches
-          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle.kts') }}
-          restore-keys: ${{ runner.os }}-gradle
+          distribution: adopt  # pre-installed on ubuntu-latest
+          cache: gradle
 
       - name: Release a new stable version to Maven Central
-        run: ./gradlew publish :flatlaf-demo:build -Drelease=true
+        run: ./gradlew publish :flatlaf-demo:build :flatlaf-theme-editor:build -Drelease=true
         env:
           OSSRH_USERNAME: ${{ secrets.OSSRH_USERNAME }}
           OSSRH_PASSWORD: ${{ secrets.OSSRH_PASSWORD }}
@@ -150,3 +130,14 @@ jobs:
           localDir: "flatlaf-demo/build/libs"
           remoteDir: "."
           options: "--only-newer --no-recursion --verbose=1"
+
+      - name: Upload theme editor
+        uses: sebastianpopp/ftp-action@releases/v2
+        with:
+          host: ${{ secrets.FTP_SERVER }}
+          user: ${{ secrets.FTP_USERNAME }}
+          password: ${{ secrets.FTP_PASSWORD }}
+          forceSsl: true
+          localDir: "flatlaf-theme-editor/build/libs"
+          remoteDir: "."
+          options: "--only-newer --no-recursion --verbose=1"

.github/workflows/natives.yml

@@ -9,48 +9,48 @@ on:
         tags:
             - '[0-9]*'
         paths:
-            - 'flatlaf-natives/flatlaf-natives-windows/**'
+            - 'flatlaf-natives/**'
             - '.github/workflows/natives.yml'
+            - 'gradle/wrapper/gradle-wrapper.properties'
     pull_request:
         branches:
             - '*'
         paths:
-            - 'flatlaf-natives/flatlaf-natives-windows/**'
+            - 'flatlaf-natives/**'
             - '.github/workflows/natives.yml'
+            - 'gradle/wrapper/gradle-wrapper.properties'
 
 jobs:
-    Windows:
-        runs-on: windows-latest
+    Natives:
+        strategy:
+            matrix:
+                os:
+                    - windows
+                    - ubuntu
+
+        runs-on: ${{ matrix.os }}-latest
 
         steps:
-            - uses: actions/checkout@v2
+            - uses: actions/checkout@v3
 
             - uses: gradle/wrapper-validation-action@v1
 
-            - name: Setup Java 1.8
-              uses: actions/setup-java@v1
+            - name: Setup Java 11
+              uses: actions/setup-java@v3
               with:
-                  java-version: 1.8
-
-            - name: Cache Gradle wrapper
-              uses: actions/cache@v1
-              with:
-                  path: ~/.gradle/wrapper
-                  key: ${{ runner.os }}-gradle-wrapper-${{ hashFiles('gradle/wrapper/gradle-wrapper.properties') }}
-
-            - name: Cache Gradle cache
-              uses: actions/cache@v2
-              with:
-                  path: ~/.gradle/caches
-                  key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle.kts') }}
-                  restore-keys: ${{ runner.os }}-gradle
+                  java-version: 11
+                  distribution: adopt
+                  cache: gradle
 
             - name: Build with Gradle
-              run: ./gradlew :flatlaf-natives-windows:build
+              # --no-daemon is necessary on Windows otherwise caching Gradle would fail with:
+              #   tar.exe: Couldn't open ~/.gradle/caches/modules-2/modules-2.lock: Permission denied
+              run: ./gradlew build-natives --no-daemon
 
             - name: Upload artifacts
-              uses: actions/upload-artifact@v2
+              uses: actions/upload-artifact@v3
               with:
-                  name: FlatLaf-natives-windows-build-artifacts
+                  name: FlatLaf-natives-build-artifacts-${{ matrix.os }}
                   path: |
-                      flatlaf-natives/flatlaf-natives-windows/build
+                      flatlaf-core/src/main/resources/com/formdev/flatlaf/natives
+                      flatlaf-natives/flatlaf-natives-*/build

CHANGELOG.md

@@ -1,6 +1,677 @@
 FlatLaf Change Log
 ==================
 
+## 2.6
+
+#### New features and improvements
+
+- If value of system property `flatlaf.nativeLibraryPath` is `system`, then
+  `System.loadLibrary(String)` is used to load the native library.
+- TabbedPane: Switch and close tabs on left mouse click only. (PR #595)
+
+#### Fixed bugs
+
+- ComboBox and Spinner: Fixed missing arrow buttons if preferred height is zero.
+  Minimum width of arrow buttons is 3/4 of default width.
+- MenuBar: Fixed NPE in `FlatMenuItemRenderer.getTopLevelFont()` if menu item
+  does not have a parent. (issue #600; regression since implementing #589 in
+  FlatLaf 2.5)
+- ScrollBar: Show "pressed" feedback on track/thumb only for left mouse button.
+  If absolute positioning is enabled (the default), then also for middle mouse
+  button.
+- Arrow buttons in ComboBox, Spinner, ScrollBar and TabbedPane: Show "pressed"
+  feedback only for left mouse button.
+- ScaledImageIcon: Do not throw exceptions if image was has invalid size (e.g.
+  not found). Instead, paint a red rectangle (similar to `FlatSVGIcon`).
+- Fixed NPE in `FlatUIUtils.isCellEditor()`. (issue #601)
+
+
+## 2.5
+
+#### New features and improvements
+
+- Linux: Use X11 window manager events to move window and to show window menu
+  (right-click on window title bar), if custom window decorations are enabled.
+  This gives FlatLaf windows a more "native" feeling. (issue #482)
+- MenuBar: Support different menu selection style UI defaults for `MenuBar` and
+  `MenuItem`. (issue #587)
+- MenuBar: Top level menus now use `MenuBar.font` instead of `Menu.font`. (issue
+  #589)
+- PasswordField: Reveal button is now hidden (and turned off) if password field
+  is disabled. (issue #501)
+- TabbedPane: New option to disable tab run rotation in wrap layout. Set UI
+  value `TabbedPane.rotateTabRuns` to `false`. (issue #574)
+- Window decorations:
+  - Added client property to mark components in embedded menu bar as "caption"
+    (allow moving window). (issue #569)
+  - Option to show window icon only in frames, but not in dialogs. Set UI value
+    `TitlePane.showIconInDialogs` to `false`. (issue #589)
+  - Added UI value `TitlePane.font` to customize window title font. (issue #589)
+- Added system property `flatlaf.updateUIOnSystemFontChange` to allow disabling
+  automatic UI update when system font changes. (issue #580)
+
+#### Fixed bugs
+
+- Fixed missing UI value `MenuItem.acceleratorDelimiter` on macOS. (was `null`,
+  is now an empty string)
+- Fixed possible exception in `FlatUIUtils.resetRenderingHints()`. (issue #575)
+- Fixed AWT components on macOS, which use Swing components internally. (issue
+  #583)
+- SwingX: Fixed missing highlighting of "today" in `JXMonthView` and
+  `JXDatePicker`.
+
+
+## 2.4
+
+#### New features and improvements
+
+- Native window decorations (Windows 10/11 only):
+  - There is now a small area at top of the embedded menu bar to resize the
+    window.
+  - Improved window title bar layout for small window widths:
+    - Width of iconify/maximize/close buttons is reduced (if necessary) to give
+      more space to embedded menu bar and title.
+    - Window title now has a minimum width to always allow moving window
+      (click-and-drag on window title). Instead, embedded menu bar is made
+      smaller.
+    - Option to show window icon beside window title, if menu bar is embedded or
+      title is centered. Set UI value `TitlePane.showIconBesideTitle` to `true`.
+  - No longer reduce height of window title bar if it has an embedded menu bar
+    and is maximized.
+
+#### Fixed bugs
+
+- ComboBox: Fixed vertical alignment of text in popup list with text in combo
+  box in IntelliJ/Darcula themes.
+- Menus: Fixed application freeze under very special conditions (invoking
+  `FlatLaf.initialize()` twice in NetBeans GUI builder) and using menu that has
+  submenus. See
+  [NetBeans issue #4231](https://github.com/apache/netbeans/issues/4231#issuecomment-1179611682)
+  for details.
+- MenuItem: Fixed sometimes wrapped HTML text on HiDPI screens on Windows.
+- TableHeader: Fixed exception when changing table structure (e.g. removing
+  column) from a table header popup menu action. (issue #532)
+- `HiDPIUtils.paintAtScale1x()` now supports rotated graphics. (issue #557)
+- Typography: No longer use `Consolas` or `Courier New` as monospaced font on
+  Windows because they have bad vertically placement.
+- Native window decorations (Windows 10/11 only):
+  - Do not center window title if embedded menu bar is empty or has no menus at
+    left side, but some components at right side. (issue #558)
+  - Do not use window decorations if system property `sun.java2d.opengl` is
+    `true` on Windows 10. (issue #540)
+  - Fixed missing top window border in dark themes if window drop shadows are
+    disabled in system settings. (issue #554; Windows 10 only)
+  - Right-to-left component orientation of title bar was lost when switching
+    theme.
+
+
+## 2.3
+
+#### New features and improvements
+
+- FileChooser: Added (optional) shortcuts panel. On Windows it contains "Recent
+  Items", "Desktop", "Documents", "This PC" and "Network". On macOS and Linux it
+  is empty/hidden. (issue #100)
+- Button and ToggleButton: Added missing foreground colors for hover, pressed,
+  focused and selected states. (issue #535)
+- Table: Optionally paint alternating rows below table if table is smaller than
+  scroll pane. Set UI value `Table.paintOutsideAlternateRows` to `true`.
+  Requires that `Table.alternateRowColor` is set to a color. (issue #504)
+- ToggleButton: Made the underline placement of tab-style toggle buttons
+  configurable. (PR #530; issue #529)
+- Added spanish translation. (PR #525)
+
+#### Fixed bugs
+
+- IntelliJ Themes: Fixed `TitledBorder` text color in "Monokai Pro" theme.
+  (issue #524)
+
+
+## 2.2
+
+#### New features and improvements
+
+- SplitPane: Allow limiting one-touch expanding to a single side (set client
+  property `JSplitPane.expandableSide` to `"left"` or `"right"`). (issue #355)
+- TabbedPane: Selected tab underline color now changes depending on whether the
+  focus is within the tab content. (issue #398)
+- IntelliJ Themes:
+  - Added "Monokai Pro" and "Xcode-Dark" themes.
+  - TabbedPane now use different background color for selected tabs in all "Arc"
+    themes, in "Hiberbee Dark" and in all "Material UI Lite" themes.
+
+#### Fixed bugs
+
+- Native window decorations (Windows 10/11 only): Fixed wrong window title
+  character encoding used in Windows taskbar. (issue #502)
+- Button: Fixed icon layout and preferred width of default buttons that use bold
+  font. (issue #506)
+- FileChooser: Enabled full row selection for details view to fix alternate row
+  coloring. (issue #512)
+- SplitPane: Fixed `StackOverflowError` caused by layout loop that may occur
+  under special circumstances. (issue #513)
+- Table: Slightly changed grid colors to make grid better recognizable. (issue
+  #514)
+- ToolBar: Fixed endless loop in focus navigation that may occur under special
+  circumstances. (issue #505)
+- IntelliJ Themes: `Component.accentColor` UI property now has useful theme
+  specific values. (issue #507)
+
+
+## 2.1
+
+#### New features and improvements
+
+- Menus: Improved usability of submenus. (PR #490; issue #247)
+- Menus: Scroll large menus using mouse wheel or up/down arrows. (issue #225)
+- Linux: Support using custom window decorations. Enable with
+  `JFrame.setDefaultLookAndFeelDecorated(true)` and
+  `JDialog.setDefaultLookAndFeelDecorated(true)` before creating a window.
+  (issue #482)
+- ScrollBar: Added UI value `ScrollBar.minimumButtonSize` to specify minimum
+  scroll arrow button size (if shown). (issue #493)
+
+#### Fixed bugs
+
+- PasswordField: Fixed reveal button appearance in IntelliJ themes. (issue #494)
+- ScrollBar: Center and scale arrows in scroll up/down buttons (if shown).
+  (issue #493)
+- TextArea, TextPane and EditorPane: No longer select all text when component is
+  focused for the first time. (issue #498; regression in FlatLaf 2.0)
+- TabbedPane: Disable all items in "Show Hidden Tabs" popup menu if tabbed pane
+  is disabled.
+
+#### Incompatibilities
+
+- Method `FlatUIUtils.paintArrow()` (and class `FlatArrowButton`) now paints
+  arrows one pixel smaller than before. To fix this, increase parameter
+  `arrowSize` by one.
+
+
+## 2.0.2
+
+- Native window decorations (Windows 10/11 only): Fixed rendering artifacts on
+  HiDPI screens when dragging window partly offscreen and back into screen
+  bounds. (issue #477)
+- Repaint component when setting client property `JComponent.outline` (issue
+  #480).
+- macOS: Fixed NPE when using some icons in main menu items. (issue #483)
+
+
+## 2.0.1
+
+- Fixed memory leak in Panel, Separator and ToolBarSeparator. (issue #471;
+  regression in FlatLaf 2.0)
+- ToolTip: Fixed wrong tooltip location if component overrides
+  `JComponent.getToolTipLocation()` and wants place tooltip under mouse
+  location. (issue #468)
+- Extras: Added copy constructor to `FlatSVGIcon`. (issue #465)
+- Moved `module-info.class` from `META-INF\versions\9\` to root folder of JARs.
+  (issue #466)
+
+
+## 2.0
+
+- Added system property `flatlaf.nativeLibraryPath` to load native libraries
+  from a directory. (PR #453)
+- Fixed "endless recursion in font" exception in
+  `FlatLaf$ActiveFont.createValue()` if `UIManager.getFont()` is invoked from
+  multiple threads. (issue #456)
+- PasswordField: Preserve reveal button state when switching theme. (PR #442;
+  issue #173)
+- PasswordField: Reveal button did not show password if
+  `JPasswordField.setEchoChar()` was invoked from application. (PR #442; issue
+  #173)
+- Slider: Fixed/improved focused indicator color when changing accent color. (PR
+  #375)
+- TextField:
+  - Improved hover/pressed/selected colors of leading/trailing buttons (e.g.
+    "reveal" button in password field). (issue #452)
+  - Clear button no longer paints over round border. (issue #451)
+- Extras: Fixed concurrent loading of SVG icons on multiple threads. (issue
+  #459)
+- Use FlatLaf native window decorations by default when running in
+  [JetBrains Runtime](https://github.com/JetBrains/JetBrainsRuntime/wiki)
+  (instead of using JetBrains custom decorations). System variable
+  `flatlaf.useJetBrainsCustomDecorations` is now `false` by default (was `true`
+  in FlatLaf 1.x). (issue #454)
+- Native window decorations:
+  - Fixed blurry iconify/maximize/close button hover rectangles at 125%, 150% or
+    175% scaling. (issue #431)
+  - Updated maximize and restore icons for Windows 11 style. (requires Java
+    8u321, 11.0.14, 17.0.2 or 18+)
+  - Updated hover and pressed colors of iconify/maximize/close buttons for
+    Windows 11 style.
+
+
+## 2.0-rc1
+
+#### New features and improvements
+
+- Styling:
+  - Styling individual components using string in CSS syntax or `java.util.Map`.
+    (PR #341)\
+    E.g.: `mySlider.putClientProperty( "FlatLaf.style", "trackWidth: 2" );`
+  - Style classes allow defining style rules at a single place (in UI defaults)
+    and use them in any component. (PR #388)\
+    E.g.: `mySlider.putClientProperty( "FlatLaf.styleClass", "myclass" );`
+- Typography defines several font styles for headers and various text sizes,
+  which makes it easy to use consistent font styles across the application. (PR
+  #396)
+- Native window decorations (Windows 10/11 only):
+  - Unified backgrounds for window title bar is now enabled by default (window
+    title bar has now same background color as window content). Bottom separator
+    for menu bars is no longer painted (if unified background is enabled).
+  - Show Windows 11 snap layouts menu when hovering the mouse over the maximize
+    button. (issues #397 and #407)
+  - Possibility to hide window title bar icon (for single window set client
+    property `JRootPane.titleBarShowIcon` to `false`; for all windows set UI
+    value `TitlePane.showIcon` to `false`).
+  - OptionPane: Hide window title bar icon by default. Can be made visibly by
+    setting UI default `OptionPane.showIcon` to `true`. (issue #416)
+  - No longer show the Java "duke/cup" icon if no window icon image is set.
+    (issue #416)
+- TextField, FormattedTextField and PasswordField:
+  - Support leading and trailing icons (set client property
+    `JTextField.leadingIcon` or `JTextField.trailingIcon` to a
+    `javax.swing.Icon`). (PR #378; issue #368)
+  - Support leading and trailing components (set client property
+    `JTextField.leadingComponent` or `JTextField.trailingComponent` to a
+    `java.awt.Component`). (PR #386)
+  - Support "clear" (or "cancel") button to empty text field. Only shown if text
+    field is not empty, editable and enabled. (set client property
+    `JTextField.showClearButton` to `true`). (PR #442)
+- PasswordField: Support reveal (or "eye") button to show password. (see UI
+  value `PasswordField.showRevealButton`) (PR #442; issue #173)
+- TextComponents: Double/triple-click-and-drag now extends selection by whole
+  words/lines.
+- Theming improvements: Reworks core themes to make it easier to create new
+  themes (e.g. reduced explicit colors by using color functions). **Note**:
+  There are minor incompatible changes in FlatLaf properties files. (PR #390)
+- ToolBar:
+  - Toolbars are no longer floatable by default (dots on left side of toolbar
+    that allows dragging toolbar). Use `UIManager.put( "ToolBar.floatable", true
+    )` if you want the old behavior.
+  - Skip components with empty input map (e.g. `JLabel`) when using arrow keys
+    to navigate in focusable buttons (if UI value `ToolBar.focusableButtons` is
+    `true`).
+  - Support arrow-keys-only navigation within focusable buttons of toolbar (if
+    UI value `ToolBar.focusableButtons` is `true`):
+    - arrow keys move focus within toolbar
+    - tab-key moves focus out of toolbar
+    - if moving focus into the toolbar, focus recently focused toolbar button
+- ComboBox, Spinner, TextField and subclasses: Support specifying width of
+  border (see UI value `Component.borderWidth`).
+- CheckBox and RadioButton:
+  - Made selected icon better recognizable in **FlatLaf Light** (use blue
+    border), **Dark** and **Darcula** (use lighter border) themes. **IntelliJ**
+    theme is not changed.
+  - Support specifying width of icon border (see UI value
+    `CheckBox.icon.borderWidth`).
+  - Reworked icon UI defaults and added missing ones. **Note**: There are minor
+    incompatible changes in FlatLaf properties files.
+- Slider: Support specifying width of thumb border (see UI value
+  `Slider.thumbBorderWidth`).
+- TabbedPane: Optionally paint selected tab as card. (PR #343)
+- MenuItem:
+  - Paint the selected icon when the item is selected. (PR #415)
+  - Vertically align text if icons have different widths. (issue #437)
+- Panel: Support painting background with rounded corners. (issue #367)
+- Added more color functions to class `ColorFunctions` for easy use in
+  applications: `lighten()`, `darken()`, `saturate()`, `desaturate()`, `spin()`,
+  `tint()`, `shade()` and `luma()`.
+- Support defining fonts in FlatLaf properties files. (issue #384)
+- Added method `FlatLaf.registerCustomDefaultsSource(URL packageUrl)` for JPMS.
+  (issue #325)
+- Extras:
+  - Added class `FlatDesktop` for easy integration into macOS screen menu
+    (About, Preferences and Quit) when using Java 8.
+  - `FlatSVGIcon`: Support loading SVG from `URL` (for JPMS), `URI`, `File` or
+    `InputStream`. (issues #419 and #325)
+  - `FlatSVGUtils`: Support loading SVG from `URL` (for JPMS). (issue #325)
+- SwingX:
+  - New "column control" icon for `JXTable` that scales and uses antialiasing.
+    (issue #434)
+
+#### Fixed bugs
+
+- Native window decorations: Fixed `UnsatisfiedLinkError` on Windows 11 for ARM
+  processors. (issue #443)
+- MenuBar: Do not fill background if non-opaque and having custom background
+  color. (issue #409)
+- InternalFrame: Fill background to avoid that parent may shine through internal
+  frame if it contains non-opaque components. (better fix for issue #274)
+- SwingX: Fixed `NullPointerException` in `FlatCaret` when using
+  `org.jdesktop.swingx.prompt.PromptSupport.setPrompt()` on a text field and
+  then switching theme.
+
+
+## 1.6.5
+
+#### Fixed bugs
+
+- Linux: Fixed font problems when running on Oracle Java (OpenJDK is not
+  affected):
+  - oversized text if system font is "Inter" (issue #427)
+  - missing text if system font is "Cantarell" (on Fedora)
+- MenuItem: Changed accelerator delimiter from `-` to `+`. (Windows and Linux).
+- ComboBox: Fixed occasional `StackOverflowError` when modifying combo box not
+  on AWT thread. (issue #432)
+- macOS: Fixed `NullPointerException` when using AWT component
+  `java.awt.Choice`. (issue #439)
+- Native window decorations: Do not exit application with `UnsatisfiedLinkError`
+  in case that FlatLaf DLL cannot be executed because of restrictions on
+  temporary directory. Instead, continue with default window decorations. (issue
+  #436)
+
+
+## 1.6.4
+
+#### Fixed bugs
+
+- ComboBox: Fixed regression in FlatLaf 1.6.3 that makes selected item invisible
+  in popup list if `DefaultListCellRenderer` is used as renderer. If using
+  default renderer, it works. (issue #426)
+
+
+## 1.6.3
+
+#### Fixed bugs
+
+- ComboBox (not editable): Fixed regression in FlatLaf 1.6.2 that may display
+  text in non-editable combo boxes in bold. (issue #423)
+- Tree: Fixed editing cell issue with custom cell renderer and cell editor that
+  use same component for rendering and editing. (issue #385)
+
+
+## 1.6.2
+
+#### Fixed bugs
+
+- ComboBox (not editable): Fixed background painted outside of border if round
+  edges are enabled (client property `JComponent.roundRect` is `true`). (similar
+  to issue #382; regression since fixing #330 in FlatLaf 1.4)
+- ComboBox: Fixed `NullPointerException`, which may occur under special
+  circumstances. (issue #408)
+- Table: Do not select text in cell editor when it gets focus (when
+  `JTable.surrendersFocusOnKeystroke` is `true`) and
+  `TextComponent.selectAllOnFocusPolicy` is `once` (the default) or `always`.
+  (issue #395)
+- Linux: Fixed NPE when using `java.awt.TrayIcon`. (issue #405)
+- FileChooser: Workaround for crash on Windows with Java 17 32-bit (disabled
+  Windows icons). Java 17 64-bit is not affected. (issue #403)
+- Native window decorations: Fixed layout loop, which may occur under special
+  circumstances and slows down the application. (issue #420)
+
+
+## 1.6.1
+
+#### Fixed bugs
+
+- Native window decorations: Catch `UnsatisfiedLinkError` when trying to load
+  `jawt.dll` to avoid an application crash (Java 8 on Windows 10 only).
+
+
+## 1.6
+
+#### New features and improvements
+
+- InternalFrame: Double-click on icon in internal frame title bar now closes the
+  internal frame. (issue #374)
+- IntelliJ Themes: Removed deprecated `install()` methods.
+
+#### Fixed bugs
+
+- Menus: Fixed missing modifiers flags in `ActionEvent` (e.g. `Ctrl` key
+  pressed) when running in Java 9+ on Linux, macOS. Occurs also on Windows in
+  large popup menus that do not fit into the window. (issue #371; regression
+  since FlatLaf 1.3)
+- OptionPane: Fixed `OptionPane.sameSizeButtons`, which did not work as expected
+  when setting to `false`.
+- OptionPane: Fixed rendering of longer HTML text if it is passed as
+  `StringBuilder`, `StringBuffer`, or any other object that returns HTML text in
+  method `toString()`. (similar to issue #12)
+- ComboBox: Fixed popup border painting on HiDPI screens (e.g. at 150% scaling).
+- ComboBox: Fixed popup location if shown above of combo box (Java 8 only).
+- ComboBox (editable): Fixed wrong border of internal text field under special
+  circumstances.
+- Spinner: Fixed painting of border corners on left side. (issue #382;
+  regression since fixing #330 in FlatLaf 1.4)
+- TableHeader: Do not show resize cursor for last column if resizing last column
+  is not possible because auto resize mode of table is not off. (issue #332)
+- TableHeader: Fixed missing trailing vertical separator line if used in upper
+  left corner of scroll pane. (issue #332)
+- TextField, FormattedTextField, PasswordField and ComboBox: Fixed alignment of
+  placeholder text in right-to-left component orientation.
+- Slider: Fixed calculation of baseline, which was wrong under some
+  circumstances.
+
+
+## 1.5
+
+#### New features and improvements
+
+- SwingX: Added search and clear icons to `JXSearchField`. (issue #359)
+
+#### Fixed bugs
+
+- Button and TextComponent: Do not apply minimum width/height if margins are
+  set. (issue #364)
+- ComboBox and Spinner: Limit arrow button width if component has large
+  preferred height. (issue #361)
+- FileChooser: Fixed missing (localized) texts when FlatLaf is loaded in special
+  classloader (e.g. plugin system in Apache NetBeans).
+- InternalFrame: Limit internal frame bounds to parent bounds on resize. Also
+  honor maximum size of internal frame. (issue #362)
+- Popup: Fixed incorrectly placed drop shadow for medium-weight popups in
+  maximized windows. (issue #358)
+- Native window decorations (Windows 10 only):
+  - Fixed occasional application crash in `flatlaf-windows.dll`. (issue #357)
+  - When window is initially shown, fill background with window background color
+    (instead of white), which avoids flickering in dark themes. (issue 339)
+  - When resizing a window at the right/bottom edge, then first fill the new
+    space with the window background color (instead of black) before the layout
+    is updated.
+  - When resizing a window at the left/top edge, then first fill the new space
+    with the window background color (instead of garbage) before the layout is
+    updated.
+
+
+## 1.4
+
+#### New features and improvements
+
+- TextField, FormattedTextField and PasswordField: Support adding extra padding
+  (set client property `JTextField.padding` to an `Insets`).
+- PasswordField: UI delegate `FlatPasswordFieldUI` now extends `FlatTextFieldUI`
+  (instead of `BasicPasswordFieldUI`) to avoid duplicate code and for easier
+  extensibility.
+- Table and PopupFactory: Use `StackWalker` in Java 9+ for better performance.
+  (issue #334)
+- ToolBar: Paint focus indicator for focused button in toolbar. (issue #346)
+- ToolBar: Support focusable buttons in toolbar (set UI value
+  `ToolBar.focusableButtons` to `true`). (issue #346)
+
+#### Fixed bugs
+
+- ComboBox (editable) and Spinner: Increased size of internal text field to the
+  component border so that it behaves like plain text field (mouse click to left
+  of text now positions caret to first character instead of opening ComboBox
+  popup; mouse cursor is now of type "text" within the whole component, except
+  for arrow buttons). (issue #330)
+- ComboBox (not editable): Increased size of internal renderer pane to the
+  component border so that it can paint within the whole component. Also
+  increase combo box size if a custom renderer uses a border with insets that
+  are larger than the default combo box padding (`2,6,2,6`).
+- Fixed component heights at `1.25x`, `1.75x` and `2.25x` scaling factors (Java
+  8 only) so that Button, ComboBox, Spinner and TextField components (including
+  subclasses) have same heights. This increases heights of Button and TextField
+  components by:
+  - `2px` at `1.75x` in **Light** and **Dark** themes
+  - `2px` at `1.25x` and `2.25x` in **IntelliJ** and **Darcula** themes
+- OptionPane: Do not make child components, which are derived from `JPanel`,
+  non-opaque. (issue #349)
+- OptionPane: Align wrapped lines to the right if component orientation is
+  right-to-left. (issue #350)
+- PasswordField: Caps lock icon no longer painted over long text. (issue #172)
+- PasswordField: Paint caps lock icon on left side in right-to-left component
+  orientation.
+- Window decorations: Window title bar width is no longer considered when
+  calculating preferred/minimum width of window. (issue #351)
+
+
+## 1.3
+
+#### New features and improvements
+
+- TextComponents, ComboBox and Spinner: Support different background color when
+  component is focused (use UI values `TextField.focusedBackground`,
+  `PasswordField.focusedBackground`, `FormattedTextField.focusedBackground`,
+  `TextArea.focusedBackground`, `TextPane.focusedBackground`,
+  `EditorPane.focusedBackground`, `ComboBox.focusedBackground`,
+  `ComboBox.buttonFocusedBackground`, `ComboBox.popupBackground` and
+  `Spinner.focusedBackground`). (issue #335)
+
+#### Fixed bugs
+
+- Fixed white lines at bottom and right side of window (in dark themes on HiDPI
+  screens with scaling enabled).
+- ScrollBar: Fixed left/top arrow icon location (if visible). (issue #329)
+- Spinner: Fixed up/down arrow icon location.
+- ToolTip: Fixed positioning of huge tooltips. (issue #333)
+
+
+## 1.2
+
+#### New features and improvements
+
+- Renamed `Flat*Laf.install()` methods to `Flat*Laf.setup()` to avoid confusion
+  with `UIManager.installLookAndFeel(LookAndFeelInfo info)`. The old
+  `Flat*Laf.install()` methods are still there, but marked as deprecated. They
+  will be removed in a future version.
+- Button and ToggleButton: Support borderless button style (set client property
+  `JButton.buttonType` to `borderless`). (PR #276)
+- ComboBox: Support using as cell renderer (e.g. in `JTable`).
+- DesktopPane: Improved layout of iconified internal frames in dock:
+  - Always placed at bottom-left in desktop pane.
+  - Newly iconified frames are added to the right side of the dock.
+  - If frame is deiconified, dock is compacted (icons move to the left).
+  - If dock is wider than desktop width, additional rows are used.
+  - If desktop pane is resized, layout of dock is updated.
+- TableHeader: Moved table header column border painting from
+  `FlatTableHeaderUI` to new border `FlatTableHeaderBorder` to improve
+  compatibility with custom table header implementations. (issue #228)
+- Linux: Enable text anti-aliasing if no Gnome or KDE Desktop properties are
+  available. (issue #218)
+- IntelliJ Themes: Added "Material Theme UI Lite / GitHub Dark" theme.
+- JIDE Common Layer: Improved support for `JideTabbedPane`. (PR #306)
+- Extras: `FlatSVGIcon` improvements:
+  - Each icon can now have its own color filter. (PR #303)
+  - Use mapper function in color filter to dynamically map colors. (PR #303)
+  - Color filter supports light and dark themes.
+  - Getters for icon name, classloader, etc.
+- Extras: UI Inspector: Show class hierarchies when pressing <kbd>Alt</kbd> key
+  and prettified class names (dimmed package name).
+- Extras: `FlatSVGUtils.createWindowIconImages()` now returns a single
+  multi-resolution image that creates requested image sizes on demand from SVG
+  (only on Windows with Java 9+).
+
+#### Fixed bugs
+
+- CheckBox and RadioButton: Do not fill background if used as cell renderer,
+  except if cell is selected or has different background color. (issue #311)
+- DesktopPane:
+  - Fixed missing preview of iconified internal frames in dock when using a
+    custom desktop manager. (PR #294)
+  - Fixed incomplete preview of iconified internal frames in dock when switching
+    LaF.
+  - On HiDPI screens, use high-resolution images for preview of iconified
+    internal frames in dock.
+- PopupFactory: Fixed occasional `NullPointerException` in
+  `FlatPopupFactory.fixToolTipLocation()`. (issue #305)
+- Tree: Fill cell background if
+  `DefaultTreeCellRenderer.setBackgroundNonSelectionColor(Color)` was used.
+  (issue #322)
+- IntelliJ Themes: Fixed background colors of DesktopPane and DesktopIcon in all
+  themes.
+- Native window decorations:
+  - Fixed slow application startup under particular conditions. (e.g. incomplete
+    custom JRE) (issue #319)
+  - Fixed occasional double window title bar when creating many frames or
+    dialogs. (issue #315)
+  - Fixed broken maximizing window (under special conditions) when restoring
+    frame state at startup.
+  - Title icon: For multi-resolution images now use `getResolutionVariant(width,
+    height)` (instead of `getResolutionVariants()`) to allow creation of
+    requested size on demand. This also avoids creation of all resolution
+    variants.
+  - Double-click at upper-left corner of maximized frame did not close window.
+    (issue #326)
+- Linux: Fixed/improved detection of user font settings. (issue #309)
+
+
+## 1.1.2
+
+#### New features and improvements
+
+- Native window decorations: Added API to check whether current platform
+  supports window decorations (`FlatLaf.supportsNativeWindowDecorations()`) and
+  to toggle window decorations of all windows
+  (`FlatLaf.setUseNativeWindowDecorations(boolean)`).
+- Native window decorations: Support changing title bar background and
+  foreground colors per window. (set client properties
+  `JRootPane.titleBarBackground` and `JRootPane.titleBarForeground` on root pane
+  to a `java.awt.Color`).
+
+#### Fixed bugs
+
+- Native window decorations: Fixed loading of native library when using Java
+  Platform Module System (JPMS) for application. (issue #289)
+- Native window decorations: Removed superfluous pixel-line at top of screen
+  when window is maximized. (issue #296)
+- Window decorations: Fixed random window title bar background in cases were
+  background is not filled by custom window or root pane components and unified
+  background is enabled.
+- IntelliJ Themes: Fixed window title bar background if unified background is
+  enabled.
+- IntelliJ Themes: Fixed system colors.
+- Button and ToggleButton: Do not paint background of disabled (and unselected)
+  toolBar buttons. (issue #292; regression since fixing #112)
+- ComboBox and Spinner: Fixed too wide arrow button if component is higher than
+  preferred. (issue #302)
+- SplitPane: `JSplitPane.setContinuousLayout(false)` did not work. (issue #301)
+- TabbedPane: Fixed NPE when creating/modifying in another thread. (issue #299)
+- Fixed crash when running in Webswing. (issue #290)
+
+
+## 1.1.1
+
+#### New features and improvements
+
+- Native window decorations: Support disabling native window decorations per
+  window. (set client property `JRootPane.useWindowDecorations` on root pane to
+  `false`).
+- Support running on WinPE. (issue #279)
+
+#### Fixed bugs
+
+- Native window decorations: Fixed missing animations when minimizing,
+  maximizing or restoring a window using window title bar buttons. (issue #282)
+- Native window decorations: Fixed broken maximizing window when restoring frame
+  state at startup. (issue #283)
+- Native window decorations: Fixed double window title bar when first disposing
+  a window with `frame.dispose()` and then showing it again with
+  `frame.setVisible(true)`. (issue #277)
+- Custom window decorations: Fixed NPE in `FlatTitlePane.findHorizontalGlue()`.
+  (issue #275)
+- Custom window decorations: Fixed right aligned progress bar in embedded menu
+  bar was overlapping window title. (issue #272)
+- Fixed missing focus indicators in heavy-weight popups. (issue #273)
+- InternalFrame: Fixed translucent internal frame menu bar background if
+  `TitlePane.unifiedBackground` is `true`. (issue #274)
+- Extras: UI Inspector: Fixed `InaccessibleObjectException` when running in Java 16.
+
+
 ## 1.1
 
 #### New features and improvements
@@ -102,7 +773,7 @@ FlatLaf Change Log
 - CheckBox and RadioButton: Fill component background as soon as background
   color is different to default background color, even if component is not
   opaque (which is the default). This paints selection if using the component as
-  cell renderer a Table, Tree or List.
+  cell renderer in Table, Tree or List.
 - TextComponents: Border of focused non-editable text components had wrong
   color.
 - Custom window decorations: Fixed top window border in dark themes when running

README.md

@@ -11,9 +11,9 @@ scales on **HiDPI** displays and runs on Java 8 or newer.
 The look is heavily inspired by **Darcula** and **IntelliJ** themes from
 IntelliJ IDEA 2019.2+ and uses almost the same colors and icons.
 
-![Flat Light](images/flat_light.png)
+![FlatLaf Light](images/flat_light.png)
 
-![Flat Dark](images/flat_dark.png)
+![FlatLaf Dark](images/flat_dark.png)
 
 
 IntelliJ Platform Themes
@@ -67,20 +67,23 @@ docs).
 Addons
 ------
 
-- [IntelliJ Themes Pack](flatlaf-intellij-themes)
-- [Extras](flatlaf-extras)
-- [SwingX](flatlaf-swingx)
-- [JIDE Common Layer](flatlaf-jide-oss)
+- [IntelliJ Themes Pack](flatlaf-intellij-themes) - bundles many popular
+  open-source 3rd party themes
+- [Extras](flatlaf-extras) - SVG icon, tri-state check box, UI inspectors, and
+  more
+- [SwingX](flatlaf-swingx) - support for SwingX components
+- [JIDE Common Layer](flatlaf-jide-oss) - support for JIDE Common Layer
+  components
 
 
 Getting started
 ---------------
 
-To enable FlatLaf, add following code to your main method before you create any
+To use FlatLaf, add following code to your main method before you create any
 Swing component:
 
 ~~~java
-FlatLightLaf.install();
+FlatLightLaf.setup();
 
 // create UI here...
 ~~~
@@ -96,20 +99,40 @@ For more information and documentation visit
 - [Customizing](https://www.formdev.com/flatlaf/customizing/)
 - [How to Customize](https://www.formdev.com/flatlaf/how-to-customize/)
 - [Properties Files](https://www.formdev.com/flatlaf/properties-files/)
+- [Components UI Properties](https://www.formdev.com/flatlaf/components/)
+- [Typography](https://www.formdev.com/flatlaf/typography/)
 - [Client Properties](https://www.formdev.com/flatlaf/client-properties/)
 - [System Properties](https://www.formdev.com/flatlaf/system-properties/)
 
 
+Theme Editor
+------------
+
+The Theme Editor that supports editing FlatLaf theme properties files. See
+[Theme Editor documentation](https://www.formdev.com/flatlaf/theme-editor/) for
+details and downloads.
+
+![Theme Editor](images/theme-editor@1.5x.png)
+
+
 Buzz
 ----
 
 - [What others say about FlatLaf on Twitter](https://twitter.com/search?f=live&q=flatlaf)
+- [FlatLaf 1.0 announcement on Reddit](https://www.reddit.com/r/java/comments/lsbcwe/flatlaf_10_swing_look_and_feel/)
 - [FlatLaf announcement on Reddit](https://www.reddit.com/r/java/comments/dl0hu3/flatlaf_flat_look_and_feel/)
 
 
 Applications using FlatLaf
 --------------------------
 
+- ![New](images/new.svg) [Ultorg](https://www.ultorg.com/) (**commercial**) - a
+  visual query system for relational databases
+- ![New](images/new.svg) [MooInfo](https://github.com/rememberber/MooInfo) -
+  visual implementation of OSHI, to view information about the system and
+  hardware
+- ![New](images/new.svg) [Jailer](https://github.com/Wisser/Jailer) 11.2 -
+  database subsetting and relational data browsing tool
 - [Apache NetBeans](https://netbeans.apache.org/) 11.3 - IDE for Java, PHP, HTML
   and much more
 - [jclasslib bytecode viewer](https://github.com/ingokegel/jclasslib) 5.5
@@ -137,13 +160,16 @@ Applications using FlatLaf
   [OpenStreetMap](https://www.openstreetmap.org/) (requires FlatLaf JOSM plugin)
 - [jAlbum](https://jalbum.net/) 21 (**commercial**) - creates photo album
   websites
+- ![New](images/new.svg) [PDF Studio](https://www.qoppa.com/pdfstudio/) 2021
+  (**commercial**) - create, review and edit PDF documents
 - [XMLmind XML Editor](https://www.xmlmind.com/xmleditor/) 9.3 (**commercial**)
 - [Total Validator](https://www.totalvalidator.com/) 15 (**commercial**) -
   checks your website
 - [j-lawyer](https://github.com/jlawyerorg/j-lawyer-org) - Kanzleisoftware
-- [MegaMek](https://github.com/MegaMek/megamek) v0.47.4 and
-  [MekHQ](https://github.com/MegaMek/mekhq) v0.47.5 - a turn-based sci-fi board
-  game
+- [MegaMek](https://github.com/MegaMek/megamek),
+  [MegaMekLab](https://github.com/MegaMek/megameklab) and
+  [MekHQ](https://github.com/MegaMek/mekhq) v0.47.5+ - a sci-fi tabletop
+  BattleTech simulator suite handling battles, unit building, and campaigns
 - [GUIslice Builder](https://github.com/ImpulseAdventure/GUIslice-Builder)
   0.13.b024 - GUI builder for
   [GUIslice](https://github.com/ImpulseAdventure/GUIslice), a lightweight GUI
@@ -169,7 +195,7 @@ Applications using FlatLaf
   systems development platform
 - [JPass](https://github.com/gaborbata/jpass) - password manager with strong
   encryption
-- [Jes - Die Java-E<EFBFBD>R](https://www.jes-eur.de)
+- [Jes - Die Java-EÜR](https://www.jes-eur.de)
 - [Mapton](https://mapton.org/) 2.0
   ([source code](https://github.com/trixon/mapton)) - some kind of map
   application (based on NetBeans platform)

build.gradle.kts

@@ -14,8 +14,8 @@
  * limitations under the License.
  */
 
-val releaseVersion = "1.1"
-val developmentVersion = "1.2-SNAPSHOT"
+val releaseVersion = "2.6"
+val developmentVersion = "3.0-SNAPSHOT"
 
 version = if( java.lang.Boolean.getBoolean( "release" ) ) releaseVersion else developmentVersion
 
@@ -37,6 +37,9 @@ println( "----------------------------------------------------------------------
 println( "FlatLaf Version: ${version}" )
 println( "Gradle ${gradle.gradleVersion} at ${gradle.gradleHomeDir}" )
 println( "Java ${System.getProperty( "java.version" )}" )
+val toolchainJavaVersion = System.getProperty( "toolchain" )
+if( !toolchainJavaVersion.isNullOrEmpty() )
+	println( "Java toolchain ${toolchainJavaVersion}" )
 println()
 
 
@@ -47,19 +50,35 @@ allprojects {
 			targetCompatibility = "1.8"
 
 			options.encoding = "ISO-8859-1"
+			options.isDeprecation = false
 		}
 
 		withType<Jar>().configureEach {
 			// manifest for all created JARs
-			manifest.attributes(mapOf(
+			manifest.attributes(
 				"Implementation-Vendor" to "FormDev Software GmbH",
 				"Implementation-Copyright" to "Copyright (C) 2019-${java.time.LocalDate.now().year} FormDev Software GmbH. All rights reserved.",
-				"Implementation-Version" to project.version))
+				"Implementation-Version" to project.version
+			)
 
 			// add META-INF/LICENSE to all created JARs
-			from("${rootDir}/LICENSE") {
-				into("META-INF")
+			from( "${rootDir}/LICENSE" ) {
+				into( "META-INF" )
 			}
 		}
+
+		withType<Javadoc>().configureEach {
+			options {
+				this as StandardJavadocDocletOptions
+
+				title = "${project.name} $version"
+				header = title
+				isUse = true
+				tags = listOf( "uiDefault", "clientProperty" )
+				addStringOption( "Xdoclint:all,-missing", "-Xdoclint:all,-missing" )
+				links( "https://docs.oracle.com/en/java/javase/11/docs/api/" )
+			}
+			isFailOnError = false
+		}
 	}
 }

buildSrc/src/main/kotlin/flatlaf-cpp-library.gradle.kts

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2022 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+plugins {
+	`cpp-library`
+}
+
+library {
+	// disable debuggable for release builds to make shared libraries smaller
+	binaries.configureEach( CppSharedLibrary::class ) {
+		with( compileTask.get() ) {
+			if( name.contains( "Release" ) )
+				isDebuggable = false
+		}
+		with( linkTask.get() ) {
+			if( name.contains( "Release" ) )
+				debuggable.set( false )
+		}
+	}
+}
+
+tasks {
+	withType<CppCompile>().configureEach {
+		doFirst {
+			println( "Used Tool Chain:" )
+			println( "  - ${toolChain.get()}" )
+			println( "Available Tool Chains:" )
+			toolChains.forEach {
+				println( "  - $it" )
+			}
+		}
+	}
+}

buildSrc/src/main/kotlin/flatlaf-java9.gradle.kts

@@ -28,7 +28,7 @@ if( JavaVersion.current() >= JavaVersion.VERSION_1_9 ) {
 	}
 
 	dependencies {
-		add( "java9Compile", sourceSets.main.get().output )
+		add( "java9Implementation", sourceSets.main.get().output )
 	}
 
 	tasks {

buildSrc/src/main/kotlin/flatlaf-jni-headers.gradle.kts

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2022 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+open class JniHeadersExtension {
+	var headers: List<String> = emptyList()
+}
+
+val extension = project.extensions.create<JniHeadersExtension>( "flatlafJniHeaders" )
+
+
+tasks {
+	register<Copy>( "jni-headers" ) {
+		// depend on :flatlaf-core:compileJava because it generates the JNI headers
+		dependsOn( ":flatlaf-core:compileJava" )
+
+		from( project( ":flatlaf-core" ).buildDir.resolve( "generated/jni-headers" ) )
+		into( "src/main/headers" )
+		include( extension.headers )
+		filter<org.apache.tools.ant.filters.FixCrLfFilter>(
+			"eol" to org.apache.tools.ant.filters.FixCrLfFilter.CrLf.newInstance( "lf" )
+		)
+	}
+}

buildSrc/src/main/kotlin/flatlaf-module-info.gradle.kts

@@ -61,12 +61,8 @@ if( JavaVersion.current() >= JavaVersion.VERSION_1_9 ) {
 		}
 
 		jar {
-			manifest.attributes( "Multi-Release" to "true" )
-
-			into( "META-INF/versions/9" ) {
-				from( sourceSets["module-info"].output ) {
-					include( "module-info.class" )
-				}
+			from( sourceSets["module-info"].output ) {
+				include( "module-info.class" )
 			}
 		}
 	}

buildSrc/src/main/kotlin/flatlaf-toolchain.gradle.kts

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2022 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+plugins {
+	java
+}
+
+val toolchainJavaVersion = System.getProperty( "toolchain" )
+if( !toolchainJavaVersion.isNullOrEmpty() ) {
+	java.toolchain {
+		languageVersion.set( JavaLanguageVersion.of( toolchainJavaVersion ) )
+	}
+}

flatlaf-core/build.gradle.kts

@@ -16,11 +16,23 @@
 
 plugins {
 	`java-library`
+	`flatlaf-toolchain`
 	`flatlaf-module-info`
 	`flatlaf-java9`
 	`flatlaf-publish`
 }
 
+val sigtest = configurations.create( "sigtest" )
+
+dependencies {
+	testImplementation( "org.junit.jupiter:junit-jupiter-api:5.7.2" )
+	testImplementation( "org.junit.jupiter:junit-jupiter-params" )
+	testRuntimeOnly( "org.junit.jupiter:junit-jupiter-engine" )
+
+	// https://github.com/jtulach/netbeans-apitest
+	sigtest( "org.netbeans.tools:sigtest-maven-plugin:1.7" )
+}
+
 java {
 	withSourcesJar()
 	withJavadocJar()
@@ -32,11 +44,6 @@ tasks {
 		options.headerOutputDirectory.set( buildDir.resolve( "generated/jni-headers" ) )
 	}
 
-	processResources {
-		// build native libraries
-		dependsOn( ":flatlaf-natives-windows:assemble" )
-	}
-
 	jar {
 		archiveBaseName.set( "flatlaf" )
 
@@ -45,22 +52,70 @@ tasks {
 		}
 	}
 
-	javadoc {
-		options {
-			this as StandardJavadocDocletOptions
-			use( true )
-			tags = listOf( "uiDefault", "clientProperty" )
-			addStringOption( "Xdoclint:all,-missing", "-Xdoclint:all,-missing" )
+	named<Jar>( "sourcesJar" ) {
+		archiveBaseName.set( "flatlaf" )
+	}
+
+	named<Jar>( "javadocJar" ) {
+		archiveBaseName.set( "flatlaf" )
+	}
+
+	check {
+		dependsOn( "sigtestCheck" )
+	}
+
+	test {
+		useJUnitPlatform()
+		testLogging.exceptionFormat = org.gradle.api.tasks.testing.logging.TestExceptionFormat.FULL
+
+		if( JavaVersion.current() >= JavaVersion.VERSION_1_9 )
+			jvmArgs( listOf( "--add-opens", "java.desktop/javax.swing.plaf.basic=ALL-UNNAMED" ) )
+	}
+
+	register( "sigtestGenerate" ) {
+		group = "verification"
+		dependsOn( "jar" )
+
+		doLast {
+			ant.withGroovyBuilder {
+				"taskdef"(
+					"name" to "sigtest",
+					"classname" to "org.netbeans.apitest.Sigtest",
+					"classpath" to sigtest.asPath )
+
+				"sigtest"(
+					"action" to "generate",
+					"fileName" to "${project.name}-sigtest.txt",
+					"classpath" to jar.get().outputs.files.asPath,
+					"packages" to "com.formdev.flatlaf,com.formdev.flatlaf.util",
+					"version" to version,
+					"release" to "1.8", // Java version
+					"failonerror" to "true" )
+			}
 		}
-		isFailOnError = false
 	}
 
-	named<Jar>("sourcesJar" ) {
-		archiveBaseName.set( "flatlaf" )
-	}
+	register( "sigtestCheck" ) {
+		group = "verification"
+		dependsOn( "jar" )
 
-	named<Jar>("javadocJar" ) {
-		archiveBaseName.set( "flatlaf" )
+		doLast {
+			ant.withGroovyBuilder {
+				"taskdef"(
+					"name" to "sigtest",
+					"classname" to "org.netbeans.apitest.Sigtest",
+					"classpath" to sigtest.asPath )
+
+				"sigtest"(
+					"action" to "check",
+					"fileName" to "${project.name}-sigtest.txt",
+					"classpath" to jar.get().outputs.files.asPath,
+					"packages" to "com.formdev.flatlaf,com.formdev.flatlaf.util",
+					"version" to version,
+					"release" to "1.8", // Java version
+					"failonerror" to "true" )
+			}
+		}
 	}
 }
 

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatClientProperties.java

@@ -39,8 +39,9 @@ public interface FlatClientProperties
 	 *     {@link #BUTTON_TYPE_SQUARE},
 	 *     {@link #BUTTON_TYPE_ROUND_RECT},
 	 *     {@link #BUTTON_TYPE_TAB},
-	 *     {@link #BUTTON_TYPE_HELP} or
-	 *     {@link BUTTON_TYPE_TOOLBAR_BUTTON}
+	 *     {@link #BUTTON_TYPE_HELP},
+	 *     {@link #BUTTON_TYPE_TOOLBAR_BUTTON} or
+	 *     {@link #BUTTON_TYPE_BORDERLESS}
 	 */
 	String BUTTON_TYPE = "JButton.buttonType";
 
@@ -89,6 +90,16 @@ public interface FlatClientProperties
 	 */
 	String BUTTON_TYPE_TOOLBAR_BUTTON = "toolBarButton";
 
+	/**
+	 * Paint the button without a border in the unfocused state.
+	 * <p>
+	 * <strong>Components</strong> {@link javax.swing.JButton} and {@link javax.swing.JToggleButton}
+	 *
+	 * @see #BUTTON_TYPE
+	 * @since 1.2
+	 */
+	String BUTTON_TYPE_BORDERLESS = "borderless";
+
 	/**
 	 * Specifies selected state of a checkbox.
 	 * <p>
@@ -115,6 +126,57 @@ public interface FlatClientProperties
 
 	//---- JComponent ---------------------------------------------------------
 
+	/**
+	 * Specifies the style of a component as String in CSS syntax ("key1: value1; key2: value2; ...")
+	 * or as {@link java.util.Map}&lt;String, Object&gt; with binary values.
+	 * <p>
+	 * The keys are the same as used in UI defaults, but without component type prefix.
+	 * E.g. for UI default {@code Slider.thumbSize} use key {@code thumbSize}.
+	 * <p>
+	 * The syntax of the CSS values is the same as used in FlatLaf properties files
+	 * (<a href="https://www.formdev.com/flatlaf/properties-files/">https://www.formdev.com/flatlaf/properties-files/</a>),
+	 * but some features are not supported (e.g. variables).
+	 * When using a map, the values are not parsed from a string. They must be binary.
+	 * <p>
+	 * <strong>Components</strong> {@link javax.swing.JComponent}<br>
+	 * <strong>Value type</strong> {@link java.lang.String} or {@link java.util.Map}&lt;String, Object&gt;<br>
+	 *
+	 * @since 2
+	 */
+	String STYLE = "FlatLaf.style";
+
+	/**
+	 * Specifies the style class(es) of a component as String (single class or multiple classes separated by space characters)
+	 * or as {@code String[]} or {@link java.util.List}&lt;String&gt; (multiple classes).
+	 * <p>
+	 * The style rules must be defined in UI defaults either as strings (in CSS syntax)
+	 * or as {@link java.util.Map}&lt;String, Object&gt; (with binary values).
+	 * The key must be in syntax: {@code [style]type.styleClass}, where the type is optional.
+	 * E.g. in FlatLaf properties file:
+	 * <pre>{@code
+	 * [style]Button.primary = borderColor: #08f; background: #08f; foreground: #fff
+	 * [style].secondary = borderColor: #0f8; background: #0f8
+	 * }</pre>
+	 * or in Java code:
+	 * <pre>{@code
+	 * UIManager.put( "[style]Button.primary", "borderColor: #08f; background: #08f; foreground: #fff" );
+	 * UIManager.put( "[style].secondary", "borderColor: #0f8; background: #0f8" );
+	 * }</pre>
+	 * The rule "Button.primary" can be applied to buttons only.
+	 * The rule ".secondary" can be applied to any component.
+	 * <p>
+	 * To have similar behavior as in CSS, first the rule without type is applied,
+	 * then the rule with type.
+	 * E.g. setting style class to "foo" on a {@code JButton} uses rules
+	 * from UI default keys "[style].foo" and "[style]Button.foo".
+	 * <p>
+	 * <strong>Components</strong> {@link javax.swing.JComponent}<br>
+	 * <strong>Value type</strong> {@link java.lang.String}, {@code String[]} or {@link java.util.List}&lt;String&gt;<br>
+	 *
+	 * @since 2
+	 */
+	String STYLE_CLASS = "FlatLaf.styleClass";
+
 	/**
 	 * Specifies minimum width of a component.
 	 * <p>
@@ -191,6 +253,19 @@ public interface FlatClientProperties
 	 */
 	String COMPONENT_FOCUS_OWNER = "JComponent.focusOwner";
 
+	/**
+	 * Specifies whether a component in an embedded menu bar should behave as caption
+	 * (left-click allows moving window, right-click shows window system menu).
+	 * The component does not receive mouse pressed/released/clicked/dragged events,
+	 * but it gets mouse entered/exited/moved events.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JComponent}<br>
+	 * <strong>Value type</strong> {@link java.lang.Boolean}
+	 *
+	 * @since 2.5
+	 */
+	String COMPONENT_TITLE_BAR_CAPTION = "JComponent.titleBarCaption";
+
 	//---- Popup --------------------------------------------------------------
 
 	/**
@@ -232,14 +307,85 @@ public interface FlatClientProperties
 	//---- JRootPane ----------------------------------------------------------
 
 	/**
-	 * Specifies whether the menu bar is embedded into the title pane if custom
-	 * window decorations are enabled. Default is {@code true}.
+	 * Specifies whether FlatLaf native window decorations should be used
+	 * for {@code JFrame} or {@code JDialog}.
+	 * <p>
+	 * Setting this enables/disables using FlatLaf native window decorations
+	 * for the window that contains the root pane.
+	 * <p>
+	 * This client property has lower priority than system property
+	 * {@link FlatSystemProperties#USE_WINDOW_DECORATIONS}, but higher priority
+	 * than UI default {@code TitlePane.useWindowDecorations}.
+	 * <p>
+	 * (requires Window 10)
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JRootPane}<br>
+	 * <strong>Value type</strong> {@link java.lang.Boolean}
+	 *
+	 * @since 1.1.1
+	 */
+	String USE_WINDOW_DECORATIONS = "JRootPane.useWindowDecorations";
+
+	/**
+	 * Specifies whether the menu bar is embedded into the window title pane
+	 * if window decorations are enabled.
+	 * <p>
+	 * Setting this enables/disables embedding
+	 * for the window that contains the root pane.
+	 * <p>
+	 * This client property has lower priority than system property
+	 * {@link FlatSystemProperties#MENUBAR_EMBEDDED}, but higher priority
+	 * than UI default {@code TitlePane.menuBarEmbedded}.
+	 * <p>
+	 * (requires Window 10)
 	 * <p>
 	 * <strong>Component</strong> {@link javax.swing.JRootPane}<br>
 	 * <strong>Value type</strong> {@link java.lang.Boolean}
 	 */
 	String MENU_BAR_EMBEDDED = "JRootPane.menuBarEmbedded";
 
+	/**
+	 * Specifies whether the window icon should be shown in the window title bar
+	 * (requires enabled window decorations).
+	 * <p>
+	 * Setting this shows/hides the windows icon
+	 * for the {@code JFrame} or {@code JDialog} that contains the root pane.
+	 * <p>
+	 * This client property has higher priority than UI default {@code TitlePane.showIcon}.
+	 * <p>
+	 * (requires Window 10)
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JRootPane}<br>
+	 * <strong>Value type</strong> {@link java.lang.Boolean}
+	 *
+	 * @since 2
+	 */
+	String TITLE_BAR_SHOW_ICON = "JRootPane.titleBarShowIcon";
+
+	/**
+	 * Background color of window title bar (requires enabled window decorations).
+	 * <p>
+	 * (requires Window 10)
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JRootPane}<br>
+	 * <strong>Value type</strong> {@link java.awt.Color}
+	 *
+	 * @since 1.1.2
+	 */
+	String TITLE_BAR_BACKGROUND = "JRootPane.titleBarBackground";
+
+	/**
+	 * Foreground color of window title bar (requires enabled window decorations).
+	 * <p>
+	 * (requires Window 10)
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JRootPane}<br>
+	 * <strong>Value type</strong> {@link java.awt.Color}
+	 *
+	 * @since 1.1.2
+	 */
+	String TITLE_BAR_FOREGROUND = "JRootPane.titleBarForeground";
+
 	//---- JScrollBar / JScrollPane -------------------------------------------
 
 	/**
@@ -258,8 +404,71 @@ public interface FlatClientProperties
 	 */
 	String SCROLL_PANE_SMOOTH_SCROLLING = "JScrollPane.smoothScrolling";
 
+	//---- JSplitPane ---------------------------------------------------------
+
+	/**
+	 * Specifies what side of the spilt pane is allowed to expand
+	 * via one-touch expanding arrow buttons.
+	 * Requires that one-touch expanding is enabled with
+	 * {@link javax.swing.JSplitPane#setOneTouchExpandable(boolean)}.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JSplitPane}<br>
+	 * <strong>Value type</strong> {@link java.lang.String}<br>
+	 * <strong>Allowed Values</strong>
+	 *     {@link #SPLIT_PANE_EXPANDABLE_SIDE_LEFT} or
+	 *     {@link #SPLIT_PANE_EXPANDABLE_SIDE_RIGHT}
+	 *
+	 * @since 2.2
+	 */
+	String SPLIT_PANE_EXPANDABLE_SIDE = "JSplitPane.expandableSide";
+
+	/**
+	 * Allow expanding only left/top side of the split pane.
+	 *
+	 * @see #SPLIT_PANE_EXPANDABLE_SIDE
+	 * @since 2.2
+	 */
+	String SPLIT_PANE_EXPANDABLE_SIDE_LEFT = "left";
+
+	/**
+	 * Allow expanding only right/bottom side of the split pane.
+	 *
+	 * @see #SPLIT_PANE_EXPANDABLE_SIDE
+	 * @since 2.2
+	 */
+	String SPLIT_PANE_EXPANDABLE_SIDE_RIGHT = "right";
+
 	//---- JTabbedPane --------------------------------------------------------
 
+	/**
+	 * Specifies type of the selected tab.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JTabbedPane}<br>
+	 * <strong>Value type</strong> {@link java.lang.String}<br>
+	 * <strong>Allowed Values</strong>
+	 *     {@link #TABBED_PANE_TAB_TYPE_UNDERLINED} or
+	 *     {@link #TABBED_PANE_TAB_TYPE_CARD}
+	 *
+	 * @since 2
+	 */
+	String TABBED_PANE_TAB_TYPE = "JTabbedPane.tabType";
+
+	/**
+	 * Paint the selected tab underlined.
+	 *
+	 * @see #TABBED_PANE_TAB_TYPE
+	 * @since 2
+	 */
+	String TABBED_PANE_TAB_TYPE_UNDERLINED = "underlined";
+
+	/**
+	 * Paint the selected tab as card.
+	 *
+	 * @see #TABBED_PANE_TAB_TYPE
+	 * @since 2
+	 */
+	String TABBED_PANE_TAB_TYPE_CARD = "card";
+
 	/**
 	 * Specifies whether separators are shown between tabs.
 	 * <p>
@@ -601,9 +810,9 @@ public interface FlatClientProperties
 	/**
 	 * Specifies a component that will be placed at the leading edge of the tabs area.
 	 * <p>
-	 * For top and bottom tab placement, the layed out component size will be
+	 * For top and bottom tab placement, the laid out component size will be
 	 * the preferred component width and the tab area height.<br>
-	 * For left and right tab placement, the layed out component size will be
+	 * For left and right tab placement, the laid out component size will be
 	 * the tab area width and the preferred component height.
 	 * <p>
 	 * <strong>Component</strong> {@link javax.swing.JTabbedPane}<br>
@@ -614,9 +823,9 @@ public interface FlatClientProperties
 	/**
 	 * Specifies a component that will be placed at the trailing edge of the tabs area.
 	 * <p>
-	 * For top and bottom tab placement, the layed out component size will be
+	 * For top and bottom tab placement, the laid out component size will be
 	 * the available horizontal space (minimum is preferred component width) and the tab area height.<br>
-	 * For left and right tab placement, the layed out component size will be
+	 * For left and right tab placement, the laid out component size will be
 	 * the tab area width and the available vertical space (minimum is preferred component height).
 	 * <p>
 	 * <strong>Component</strong> {@link javax.swing.JTabbedPane}<br>
@@ -669,10 +878,149 @@ public interface FlatClientProperties
 	 */
 	String PLACEHOLDER_TEXT = "JTextField.placeholderText";
 
+	/**
+	 * Specifies the padding of the text.
+	 * This changes the location and size of the text view within the component bounds,
+	 * but does not affect the size of the component.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JTextField} (and subclasses)<br>
+	 * <strong>Value type</strong> {@link java.awt.Insets}
+	 *
+	 * @since 1.4
+	 */
+	String TEXT_FIELD_PADDING = "JTextField.padding";
+
+	/**
+	 * Specifies an icon that will be placed at the leading edge of the text field.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JTextField} (and subclasses)<br>
+	 * <strong>Value type</strong> {@link javax.swing.Icon}
+	 *
+	 * @since 2
+	 */
+	String TEXT_FIELD_LEADING_ICON = "JTextField.leadingIcon";
+
+	/**
+	 * Specifies an icon that will be placed at the trailing edge of the text field.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JTextField} (and subclasses)<br>
+	 * <strong>Value type</strong> {@link javax.swing.Icon}
+	 *
+	 * @since 2
+	 */
+	String TEXT_FIELD_TRAILING_ICON = "JTextField.trailingIcon";
+
+	/**
+	 * Specifies a component that will be placed at the leading edge of the text field.
+	 * <p>
+	 * The component will be positioned inside and aligned to the visible text field border.
+	 * There is no gap between the visible border and the component.
+	 * The laid out component size will be the preferred component width
+	 * and the inner text field height.
+	 * <p>
+	 * The component should be not opaque because the text field border is painted
+	 * slightly inside the usually visible border in some cases.
+	 * E.g. when focused (in some themes) or when an outline color is specified
+	 * (see {@link #OUTLINE}).
+	 * <p>
+	 * The component is prepared in the following way:
+	 * <ul>
+	 * <li>Component client property {@link #STYLE_CLASS} is set to {@code inTextField}.
+	 * <li>If component is a button or toggle button, client property {@link #BUTTON_TYPE}
+	 *     is set to {@link #BUTTON_TYPE_TOOLBAR_BUTTON}
+	 *     and button cursor is set to default cursor (if not set).
+	 * <li>If component is a toolbar, client property {@link #STYLE_CLASS}
+	 *     is set to {@code inTextField} on all toolbar children
+	 *     and toolbar cursor is set to default cursor (if not set).
+	 * </ul>
+	 * Because text fields use the text cursor by default and the cursor is inherited by child components,
+	 * it may be necessary to explicitly set component cursor if you e.g. need the default arrow cursor.
+	 * E.g. {@code comp.setCursor( Cursor.getDefaultCursor() )}.
+	 * <p>
+	 * Styling is used to modify insets/margins and appearance of buttons and toolbars
+	 * so that they fit nicely into the text field and do not increase text field height.
+	 * See styles {@code [style]Button.inTextField} and {@code [style]ToolBar.inTextField}
+	 * in {@code Flat[Light|Dark]Laf.properties}.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JTextField} (and subclasses)<br>
+	 * <strong>Value type</strong> {@link javax.swing.JComponent}
+	 *
+	 * @since 2
+	 */
+	String TEXT_FIELD_LEADING_COMPONENT = "JTextField.leadingComponent";
+
+	/**
+	 * Specifies a component that will be placed at the trailing edge of the text field.
+	 * <p>
+	 * See {@link #TEXT_FIELD_LEADING_COMPONENT} for details.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JTextField} (and subclasses)<br>
+	 * <strong>Value type</strong> {@link javax.swing.JComponent}
+	 *
+	 * @since 2
+	 */
+	String TEXT_FIELD_TRAILING_COMPONENT = "JTextField.trailingComponent";
+
+	/**
+	 * Specifies whether a "clear" (or "cancel") button is shown on the trailing side
+	 * if the text field is not empty, editable and enabled. Default is {@code false}.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JTextField} (and subclasses)<br>
+	 * <strong>Value type</strong> {@link java.lang.Boolean}
+	 *
+	 * @since 2
+	 */
+	String TEXT_FIELD_SHOW_CLEAR_BUTTON = "JTextField.showClearButton";
+
+	/**
+	 * Specifies the callback that is invoked when a "clear" (or "cancel") button is clicked.
+	 * If a callback is specified than it is responsible for clearing the text field.
+	 * Without callback, the text field clears itself.
+	 * <p>
+	 * Either use a {@link java.lang.Runnable}:
+	 * <pre>{@code
+	 * myTextField.putClientProperty( "JTextField.clearCallback",
+	 *     (Runnable) () -> {
+	 *         // clear field here or cancel search
+	 *     } );
+	 * }</pre>
+	 * Or use a {@link java.util.function.Consumer}&lt;javax.swing.text.JTextComponent&gt;
+	 * that receives the text field as parameter:
+	 * <pre>{@code
+	 * myTextField.putClientProperty( "JTextField.clearCallback",
+	 *     (Consumer<JTextComponent>) textField -> {
+	 *         // clear field here or cancel search
+	 *     } );
+	 * }</pre>
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JTextField} (and subclasses)<br>
+	 * <strong>Value type</strong> {@link java.lang.Runnable}
+	 * or {@link java.util.function.Consumer}&lt;javax.swing.text.JTextComponent&gt;
+	 *
+	 * @see #TEXT_FIELD_SHOW_CLEAR_BUTTON
+	 * @since 2
+	 */
+	String TEXT_FIELD_CLEAR_CALLBACK = "JTextField.clearCallback";
+
 	//---- JToggleButton ------------------------------------------------------
 
 	/**
-	 * Height of underline if toggle button type is {@link #BUTTON_TYPE_TAB}.
+	 * Placement of underline if toggle button type is {@link #BUTTON_TYPE_TAB}
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JToggleButton}<br>
+	 * <strong>Value type</strong> {@link java.lang.Integer}<br>
+	 * <strong>SupportedValues:</strong>
+	 *     {@link SwingConstants#BOTTOM} (default)
+	 *     {@link SwingConstants#TOP},
+	 *     {@link SwingConstants#LEFT} or
+	 *     {@link SwingConstants#RIGHT}
+	 *
+	 * @since 2.3
+	 */
+	String TAB_BUTTON_UNDERLINE_PLACEMENT = "JToggleButton.tab.underlinePlacement";
+
+	/**
+	 * Thickness of underline if toggle button type is {@link #BUTTON_TYPE_TAB}.
 	 * <p>
 	 * <strong>Component</strong> {@link javax.swing.JToggleButton}<br>
 	 * <strong>Value type</strong> {@link java.lang.Integer}
@@ -737,8 +1085,7 @@ public interface FlatClientProperties
 	 * If the client property is not set, or not a {@link Boolean}, defaultValue is returned.
 	 */
 	static Boolean clientPropertyBooleanStrict( JComponent c, String key, Boolean defaultValue ) {
-		Object value = c.getClientProperty( key );
-		return (value instanceof Boolean) ? (Boolean) value : defaultValue;
+		return clientProperty( c, key, defaultValue, Boolean.class );
 	}
 
 	/**
@@ -755,7 +1102,18 @@ public interface FlatClientProperties
 	 * If the client property is not set, or not a color, defaultValue is returned.
 	 */
 	static Color clientPropertyColor( JComponent c, String key, Color defaultValue ) {
+		return clientProperty( c, key, defaultValue, Color.class );
+	}
+
+	/**
+	 * Returns the value of the specified client property if it is an instance of
+	 * the specified type. Otherwise, defaultValue is returned.
+	 *
+	 * @since 2
+	 */
+	@SuppressWarnings( "unchecked" )
+	static <T> T clientProperty( JComponent c, String key, T defaultValue, Class<T> type ) {
 		Object value = c.getClientProperty( key );
-		return (value instanceof Color) ? (Color) value : defaultValue;
+		return type.isInstance( value ) ? (T) value : defaultValue;
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatDarculaLaf.java

@@ -16,6 +16,8 @@
 
 package com.formdev.flatlaf;
 
+import javax.swing.UIManager;
+
 /**
  * A Flat LaF that has a dark color scheme and looks like Darcula LaF.
  * <p>
@@ -29,10 +31,30 @@ public class FlatDarculaLaf
 {
 	public static final String NAME = "FlatLaf Darcula";
 
-	public static boolean install() {
-		return install( new FlatDarculaLaf() );
+	/**
+	 * Sets the application look and feel to this LaF
+	 * using {@link UIManager#setLookAndFeel(javax.swing.LookAndFeel)}.
+	 *
+	 * @since 1.2
+	 */
+	public static boolean setup() {
+		return setup( new FlatDarculaLaf() );
 	}
 
+	/**
+	 * @deprecated use {@link #setup()} instead; this method will be removed in a future version
+	 */
+	@Deprecated
+	public static boolean install() {
+		return setup();
+	}
+
+	/**
+	 * Adds this look and feel to the set of available look and feels.
+	 * <p>
+	 * Useful if your application uses {@link UIManager#getInstalledLookAndFeels()}
+	 * to query available LaFs and display them to the user in a combobox.
+	 */
 	public static void installLafInfo() {
 		installLafInfo( NAME, FlatDarculaLaf.class );
 	}

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatDarkLaf.java

@@ -33,9 +33,19 @@ public class FlatDarkLaf
 	/**
 	 * Sets the application look and feel to this LaF
 	 * using {@link UIManager#setLookAndFeel(javax.swing.LookAndFeel)}.
+	 *
+	 * @since 1.2
 	 */
+	public static boolean setup() {
+		return setup( new FlatDarkLaf() );
+	}
+
+	/**
+	 * @deprecated use {@link #setup()} instead; this method will be removed in a future version
+	 */
+	@Deprecated
 	public static boolean install() {
-		return install( new FlatDarkLaf() );
+		return setup();
 	}
 
 	/**

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatDefaultsAddon.java

@@ -26,7 +26,7 @@ import javax.swing.UIDefaults;
  * Allows loading of additional .properties files from addon JARs.
  * {@link java.util.ServiceLoader} is used to load extensions of this class from addon JARs.
  * <p>
- * If you extend this class in a addon JAR, you also have to add a text file named
+ * If you extend this class in an addon JAR, you also have to add a text file named
  * {@code META-INF/services/com.formdev.flatlaf.FlatDefaultsAddon}
  * to the addon JAR. The file must contain a single line with the class name.
  * <p>
@@ -61,7 +61,7 @@ public abstract class FlatDefaultsAddon
 
 	/**
 	 * Returns the priority used to sort addon loading.
-	 * The order is only important if you want overwrite UI defaults of other addons.
+	 * The order is only important if you want to overwrite UI defaults of other addons.
 	 * Lower numbers mean higher priority.
 	 * Returns 10000 by default.
 	 */

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatIconColors.java

@@ -19,7 +19,7 @@ package com.formdev.flatlaf;
 /**
  * Default color palette for action icons and object icons.
  * <p>
- * The idea is to use only this well defined set of colors in SVG icons and
+ * The idea is to use only this well-defined set of colors in SVG icons, and
  * then they are replaced at runtime to dark variants or to other theme colors.
  * Then a single SVG icon (light variant) can be used for dark themes too.
  * IntelliJ Platform uses this mechanism to allow themes to change IntelliJ Platform icons.
@@ -35,7 +35,7 @@ package com.formdev.flatlaf;
  * <p>
  * You may use these colors also in your application (outside of SVG icons), but do
  * not use the RGB values defined in this enum.<br>
- * Instead use {@code UIManager.getColor( FlatIconColors.ACTIONS_GREY.key )}.
+ * Instead, use {@code UIManager.getColor( FlatIconColors.ACTIONS_GREY.key )}.
  *
  * @author Karl Tauber
  */

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatInputMaps.java

@@ -596,7 +596,7 @@ class FlatInputMaps
 	//---- class LazyInputMapEx -----------------------------------------------
 
 	/**
-	 * Lazily creates a input map.
+	 * Lazily creates an input map.
 	 * Similar to {@link UIDefaults.LazyInputMap}, but can use multiple bindings arrays.
 	 */
 	private static class LazyInputMapEx

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatIntelliJLaf.java

@@ -16,6 +16,8 @@
 
 package com.formdev.flatlaf;
 
+import javax.swing.UIManager;
+
 /**
  * A Flat LaF that has a light color scheme and looks like IntelliJ LaF.
  * <p>
@@ -29,10 +31,30 @@ public class FlatIntelliJLaf
 {
 	public static final String NAME = "FlatLaf IntelliJ";
 
-	public static boolean install() {
-		return install( new FlatIntelliJLaf() );
+	/**
+	 * Sets the application look and feel to this LaF
+	 * using {@link UIManager#setLookAndFeel(javax.swing.LookAndFeel)}.
+	 *
+	 * @since 1.2
+	 */
+	public static boolean setup() {
+		return setup( new FlatIntelliJLaf() );
 	}
 
+	/**
+	 * @deprecated use {@link #setup()} instead; this method will be removed in a future version
+	 */
+	@Deprecated
+	public static boolean install() {
+		return setup();
+	}
+
+	/**
+	 * Adds this look and feel to the set of available look and feels.
+	 * <p>
+	 * Useful if your application uses {@link UIManager#getInstalledLookAndFeels()}
+	 * to query available LaFs and display them to the user in a combobox.
+	 */
 	public static void installLafInfo() {
 		installLafInfo( NAME, FlatIntelliJLaf.class );
 	}

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatLightLaf.java

@@ -33,9 +33,19 @@ public class FlatLightLaf
 	/**
 	 * Sets the application look and feel to this LaF
 	 * using {@link UIManager#setLookAndFeel(javax.swing.LookAndFeel)}.
+	 *
+	 * @since 1.2
 	 */
+	public static boolean setup() {
+		return setup( new FlatLightLaf() );
+	}
+
+	/**
+	 * @deprecated use {@link #setup()} instead; this method will be removed in a future version
+	 */
+	@Deprecated
 	public static boolean install() {
-		return install( new FlatLightLaf() );
+		return setup();
 	}
 
 	/**

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatSystemProperties.java

@@ -16,6 +16,9 @@
 
 package com.formdev.flatlaf;
 
+import javax.swing.SwingUtilities;
+import com.formdev.flatlaf.util.UIScale;
+
 /**
  * Defines/documents own system properties used in FlatLaf.
  *
@@ -32,6 +35,8 @@ public interface FlatSystemProperties
 	 * To replace the Java 9+ system scale factor, use system property "sun.java2d.uiScale",
 	 * which has the same syntax as this one.
 	 * <p>
+	 * Since FlatLaf 1.1.2: Scale factors less than 100% are allowed.
+	 * <p>
 	 * <strong>Allowed Values</strong> e.g. {@code 1.5}, {@code 1.5x}, {@code 150%} or {@code 144dpi} (96dpi is 100%)<br>
 	 */
 	String UI_SCALE = "flatlaf.uiScale";
@@ -44,6 +49,17 @@ public interface FlatSystemProperties
 	 */
 	String UI_SCALE_ENABLED = "flatlaf.uiScale.enabled";
 
+	/**
+	 * Specifies whether values smaller than 100% are allowed for the user scale factor
+	 * (see {@link UIScale#getUserScaleFactor()}).
+	 * <p>
+	 * <strong>Allowed Values</strong> {@code false} and {@code true}<br>
+	 * <strong>Default</strong> {@code false}
+	 *
+	 * @since 1.1.2
+	 */
+	String UI_SCALE_ALLOW_SCALE_DOWN = "flatlaf.uiScale.allowScaleDown";
+
 	/**
 	 * Specifies whether Ubuntu font should be used on Ubuntu Linux.
 	 * By default, if not running in a JetBrains Runtime, the Liberation Sans font
@@ -55,15 +71,18 @@ public interface FlatSystemProperties
 	String USE_UBUNTU_FONT = "flatlaf.useUbuntuFont";
 
 	/**
-	 * Specifies whether FlatLaf native window decorations should be used
+	 * Specifies whether native window decorations should be used
 	 * when creating {@code JFrame} or {@code JDialog}.
 	 * <p>
-	 * Setting this to {@code true} forces using FlatLaf native window decorations
-	 * even if they are not enabled by the application.
+	 * Setting this to {@code true} forces using native window decorations
+	 * even if they are not enabled by the application.<br>
+	 * Setting this to {@code false} disables using native window decorations.
 	 * <p>
-	 * Setting this to {@code false} disables using FlatLaf native window decorations.
+	 * This system property has higher priority than client property
+	 * {@link FlatClientProperties#USE_WINDOW_DECORATIONS} and
+	 * UI default {@code TitlePane.useWindowDecorations}.
 	 * <p>
-	 * (requires Window 10)
+	 * (requires Window 10/11)
 	 * <p>
 	 * <strong>Allowed Values</strong> {@code false} and {@code true}<br>
 	 * <strong>Default</strong> none
@@ -74,28 +93,34 @@ public interface FlatSystemProperties
 	 * Specifies whether JetBrains Runtime custom window decorations should be used
 	 * when creating {@code JFrame} or {@code JDialog}.
 	 * Requires that the application runs in a
-	 * <a href="https://confluence.jetbrains.com/display/JBR/JetBrains+Runtime">JetBrains Runtime</a>
+	 * <a href="https://github.com/JetBrains/JetBrainsRuntime/wiki">JetBrains Runtime</a>
 	 * (based on OpenJDK).
 	 * <p>
-	 * Setting this to {@code true} forces using JetBrains Runtime custom window decorations
-	 * even if they are not enabled by the application.
-	 * <p>
 	 * Setting this to {@code false} disables using JetBrains Runtime custom window decorations.
+	 * Then FlatLaf native window decorations are used.
 	 * <p>
-	 * (requires Window 10)
+	 * (requires Window 10/11)
 	 * <p>
 	 * <strong>Allowed Values</strong> {@code false} and {@code true}<br>
-	 * <strong>Default</strong> none
+	 * <strong>Default</strong> {@code false} (since v2; was {@code true} in v1)
 	 */
 	String USE_JETBRAINS_CUSTOM_DECORATIONS = "flatlaf.useJetBrainsCustomDecorations";
 
 	/**
-	 * Specifies whether menubar is embedded into custom window decorations.
+	 * Specifies whether the menu bar is embedded into the window title pane
+	 * if window decorations are enabled.
 	 * <p>
-	 * (requires Window 10)
+	 * Setting this to {@code true} forces embedding.<br>
+	 * Setting this to {@code false} disables embedding.
+	 * <p>
+	 * This system property has higher priority than client property
+	 * {@link FlatClientProperties#MENU_BAR_EMBEDDED} and
+	 * UI default {@code TitlePane.menuBarEmbedded}.
+	 * <p>
+	 * (requires Window 10/11)
 	 * <p>
 	 * <strong>Allowed Values</strong> {@code false} and {@code true}<br>
-	 * <strong>Default</strong> {@code true}
+	 * <strong>Default</strong> none
 	 */
 	String MENUBAR_EMBEDDED = "flatlaf.menuBarEmbedded";
 
@@ -115,6 +140,39 @@ public interface FlatSystemProperties
 	 */
 	String USE_TEXT_Y_CORRECTION = "flatlaf.useTextYCorrection";
 
+	/**
+	 * Specifies whether FlatLaf updates the UI when the system font changes.
+	 * If {@code true}, {@link SwingUtilities#updateComponentTreeUI(java.awt.Component)}
+	 * gets invoked for all windows if the system font has changed.
+	 * This is the similar to when switching to another look and feel (theme).
+	 * Applications that do not work correctly when switching look and feel,
+	 * should disable this option to avoid corrupted UI.
+	 * <p>
+	 * <strong>Allowed Values</strong> {@code false} and {@code true}<br>
+	 * <strong>Default</strong> {@code true}
+	 * @since 2.5
+	 */
+	String UPDATE_UI_ON_SYSTEM_FONT_CHANGE = "flatlaf.updateUIOnSystemFontChange";
+
+	/**
+	 * Specifies a directory in which the native FlatLaf libraries have been extracted.
+	 * The path can be absolute or relative to current application working directory.
+	 * This can be used to avoid extraction of the native libraries to the temporary directory at runtime.
+	 * <p>
+	 * If the value is {@code "system"}, then {@link System#loadLibrary(String)} is
+	 * used to load the native library.
+	 * Searches for the native library in classloader of caller
+	 * (using {@link ClassLoader#findLibrary(String)}) and in paths specified
+	 * in system properties {@code sun.boot.library.path} and {@code java.library.path}.
+	 * (supported since FlatLaf 2.6)
+	 * <p>
+	 * If the native library can not loaded from the given path (or via {@link System#loadLibrary(String)}),
+	 * then the embedded native library is extracted to the temporary directory and loaded from there.
+	 *
+	 * @since 2
+	 */
+	String NATIVE_LIBRARY_PATH = "flatlaf.nativeLibraryPath";
+
 	/**
 	 * Checks whether a system property is set and returns {@code true} if its value
 	 * is {@code "true"} (case-insensitive), otherwise it returns {@code false}.

flatlaf-core/src/main/java/com/formdev/flatlaf/IntelliJTheme.java

@@ -34,8 +34,10 @@ import javax.swing.UIDefaults;
 import javax.swing.plaf.ColorUIResource;
 import com.formdev.flatlaf.json.Json;
 import com.formdev.flatlaf.json.ParseException;
+import com.formdev.flatlaf.util.ColorFunctions;
 import com.formdev.flatlaf.util.LoggingFacade;
 import com.formdev.flatlaf.util.StringUtils;
+import com.formdev.flatlaf.util.SystemInfo;
 
 /**
  * This class supports loading IntelliJ .theme.json files and using them as a Laf.
@@ -67,20 +69,30 @@ public class IntelliJTheme
 
 	/**
 	 * Loads a IntelliJ .theme.json file from the given input stream,
-	 * creates a Laf instance for it and installs it.
+	 * creates a Laf instance for it and sets it up.
 	 *
 	 * The input stream is automatically closed.
 	 * Using a buffered input stream is not necessary.
+	 *
+	 * @since 1.2
 	 */
-	public static boolean install( InputStream in ) {
+	public static boolean setup( InputStream in ) {
 		try {
-		    return FlatLaf.install( createLaf( in ) );
+		    return FlatLaf.setup( createLaf( in ) );
 		} catch( Exception ex ) {
 			LoggingFacade.INSTANCE.logSevere(  "FlatLaf: Failed to load IntelliJ theme", ex );
 		    return false;
 		}
 	}
 
+	/**
+	 * @deprecated use {@link #setup(InputStream)} instead; this method will be removed in a future version
+	 */
+	@Deprecated
+	public static boolean install( InputStream in ) {
+		return setup( in );
+	}
+
 	/**
 	 * Loads a IntelliJ .theme.json file from the given input stream and
 	 * creates a Laf instance for it.
@@ -153,8 +165,11 @@ public class IntelliJTheme
 		applyCheckBoxColors( defaults );
 
 		// copy values
-		for( Map.Entry<String, String> e : uiKeyCopying.entrySet() )
-			defaults.put( e.getKey(), defaults.get( e.getValue() ) );
+		for( Map.Entry<String, String> e : uiKeyCopying.entrySet() ) {
+			Object value = defaults.get( e.getValue() );
+			if( value != null )
+				defaults.put( e.getKey(), value );
+		}
 
 		// IDEA does not paint button background if disabled, but FlatLaf does
 		Object panelBackground = defaults.get( "Panel.background" );
@@ -166,7 +181,7 @@ public class IntelliJTheme
 		defaults.put( "Button.hoverBorderColor", defaults.get( "Button.focusedBorderColor" ) );
 		defaults.put( "HelpButton.hoverBorderColor", defaults.get( "Button.focusedBorderColor" ) );
 
-		// IDEA uses a SVG icon for the help button, but paints the background with Button.startBackground and Button.endBackground
+		// IDEA uses an SVG icon for the help button, but paints the background with Button.startBackground and Button.endBackground
 		Object helpButtonBackground = defaults.get( "Button.startBackground" );
 		Object helpButtonBorderColor = defaults.get( "Button.startBorderColor" );
 		if( helpButtonBackground == null )
@@ -215,6 +230,12 @@ public class IntelliJTheme
 		if( !uiKeys.contains( "ToggleButton.foreground" ) && uiKeys.contains( "Button.foreground" ) )
 			defaults.put( "ToggleButton.foreground", defaults.get( "Button.foreground" ) );
 
+		// fix DesktopPane background (use Panel.background and make it 5% darker/lighter)
+		Color desktopBackgroundBase = defaults.getColor( "Panel.background" );
+		Color desktopBackground = ColorFunctions.applyFunctions( desktopBackgroundBase,
+			new ColorFunctions.HSLIncreaseDecrease( 2, dark, 5, false, true ) );
+		defaults.put( "Desktop.background", new ColorUIResource( desktopBackground ) );
+
 		// fix List and Table background colors in Material UI Lite themes
 		if( isMaterialUILite ) {
 			defaults.put( "List.background", defaults.get( "Tree.background" ) );
@@ -227,23 +248,36 @@ public class IntelliJTheme
 			defaults.put( "Tree.rowHeight", 22 );
 
 		// apply theme specific UI defaults at the end to allow overwriting
-		defaults.putAll( themeSpecificDefaults );
+		for( Map.Entry<Object, Object> e : themeSpecificDefaults.entrySet() ) {
+			Object key = e.getKey();
+			Object value = e.getValue();
+
+			// append styles to existing styles
+			if( key instanceof String && ((String)key).startsWith( "[style]" ) ) {
+				Object oldValue = defaults.get( key );
+				if( oldValue != null )
+					value = oldValue + "; " + value;
+			}
+
+			defaults.put( key, value );
+		}
 	}
 
 	private Map<Object, Object> removeThemeSpecificDefaults( UIDefaults defaults ) {
 		// search for theme specific UI defaults keys
 		ArrayList<String> themeSpecificKeys = new ArrayList<>();
 		for( Object key : defaults.keySet() ) {
-			if( key instanceof String && ((String)key).startsWith( "[" ) )
+			if( key instanceof String && ((String)key).startsWith( "[" ) && !((String)key).startsWith( "[style]" ) )
 				themeSpecificKeys.add( (String) key );
 		}
 
 		// remove theme specific UI defaults and remember only those for current theme
 		Map<Object, Object> themeSpecificDefaults = new HashMap<>();
 		String currentThemePrefix = '[' + name.replace( ' ', '_' ) + ']';
+		String currentThemeAndAuthorPrefix = '[' + name.replace( ' ', '_' ) + "---" + author.replace( ' ', '_' ) + ']';
 		String currentAuthorPrefix = "[author-" + author.replace( ' ', '_' ) + ']';
 		String allThemesPrefix = "[*]";
-		String[] prefixes = { currentThemePrefix, currentAuthorPrefix, allThemesPrefix };
+		String[] prefixes = { currentThemePrefix, currentThemeAndAuthorPrefix, currentAuthorPrefix, allThemesPrefix };
 		for( String key : themeSpecificKeys ) {
 			Object value = defaults.remove( key );
 			for( String prefix : prefixes ) {
@@ -283,8 +317,19 @@ public class IntelliJTheme
 	@SuppressWarnings( "unchecked" )
 	private void apply( String key, Object value, UIDefaults defaults, ArrayList<Object> defaultsKeysCache, Set<String> uiKeys ) {
 		if( value instanceof Map ) {
-			for( Map.Entry<String, Object> e : ((Map<String, Object>)value).entrySet() )
-				apply( key + '.' + e.getKey(), e.getValue(), defaults, defaultsKeysCache, uiKeys );
+			Map<String, Object> map = (Map<String, Object>)value;
+			if( map.containsKey( "os.default" ) || map.containsKey( "os.windows" ) || map.containsKey( "os.mac" ) || map.containsKey( "os.linux" ) ) {
+				String osKey = SystemInfo.isWindows ? "os.windows"
+					: SystemInfo.isMacOS ? "os.mac"
+					: SystemInfo.isLinux ? "os.linux" : null;
+				if( osKey != null && map.containsKey( osKey ) )
+					apply( key, map.get( osKey ), defaults, defaultsKeysCache, uiKeys );
+				else if( map.containsKey( "os.default" ) )
+					apply( key, map.get( "os.default" ), defaults, defaultsKeysCache, uiKeys );
+			} else {
+				for( Map.Entry<String, Object> e : map.entrySet() )
+					apply( key + '.' + e.getKey(), e.getValue(), defaults, defaultsKeysCache, uiKeys );
+			}
 		} else {
 			if( "".equals( value ) )
 				return; // ignore empty value
@@ -322,7 +367,7 @@ public class IntelliJTheme
 
 				// parse value
 				try {
-					uiValue = UIDefaultsLoader.parseValue( key, valueStr );
+					uiValue = UIDefaultsLoader.parseValue( key, valueStr, null );
 				} catch( RuntimeException ex ) {
 					UIDefaultsLoader.logParseError( key, valueStr, ex, false );
 					return; // ignore invalid value
@@ -344,6 +389,10 @@ public class IntelliJTheme
 
 				// replace all values in UI defaults that match the wildcard key
 				for( Object k : defaultsKeysCache ) {
+					if( k.equals( "Desktop.background" ) ||
+						k.equals( "DesktopIcon.background" ) )
+					  continue;
+
 					if( k instanceof String ) {
 						// support replacing of mapped keys
 						// (e.g. set ComboBox.buttonEditableBackground to *.background
@@ -484,7 +533,7 @@ public class IntelliJTheme
 			// for filled checkbox/radiobutton used in light themes
 			defaults.remove( "CheckBox.icon[filled].focusWidth" );
 			defaults.put( "CheckBox.icon[filled].hoverBorderColor", defaults.get( "CheckBox.icon[filled].focusedBorderColor" ) );
-			defaults.put( "CheckBox.icon[filled].selectedFocusedBackground", defaults.get( "CheckBox.icon[filled].selectedBackground" ) );
+			defaults.put( "CheckBox.icon[filled].focusedSelectedBackground", defaults.get( "CheckBox.icon[filled].selectedBackground" ) );
 
 			if( dark ) {
 				// IDEA Darcula checkBoxFocused.svg, checkBoxSelectedFocused.svg,
@@ -493,9 +542,9 @@ public class IntelliJTheme
 				// --> add alpha to focused border colors
 				String[] focusedBorderColorKeys = new String[] {
 					"CheckBox.icon.focusedBorderColor",
-					"CheckBox.icon.selectedFocusedBorderColor",
+					"CheckBox.icon.focusedSelectedBorderColor",
 					"CheckBox.icon[filled].focusedBorderColor",
-					"CheckBox.icon[filled].selectedFocusedBorderColor",
+					"CheckBox.icon[filled].focusedSelectedBorderColor",
 				};
 				for( String key : focusedBorderColorKeys ) {
 					Color color = defaults.getColor( key );
@@ -514,12 +563,12 @@ public class IntelliJTheme
 	}
 
 	/** Rename UI default keys (key --> value). */
-	private static Map<String, String> uiKeyMapping = new HashMap<>();
+	private static final Map<String, String> uiKeyMapping = new HashMap<>();
 	/** Copy UI default keys (value --> key). */
-	private static Map<String, String> uiKeyCopying = new HashMap<>();
-	private static Map<String, String> uiKeyInverseMapping = new HashMap<>();
-	private static Map<String, String> checkboxKeyMapping = new HashMap<>();
-	private static Map<String, String> checkboxDuplicateColors = new HashMap<>();
+	private static final Map<String, String> uiKeyCopying = new HashMap<>();
+	private static final Map<String, String> uiKeyInverseMapping = new HashMap<>();
+	private static final Map<String, String> checkboxKeyMapping = new HashMap<>();
+	private static final Map<String, String> checkboxDuplicateColors = new HashMap<>();
 
 	static {
 		// ComboBox
@@ -529,6 +578,8 @@ public class IntelliJTheme
 		uiKeyMapping.put( "ComboBox.ArrowButton.disabledIconColor",     "ComboBox.buttonDisabledArrowColor" );
 		uiKeyMapping.put( "ComboBox.ArrowButton.iconColor",             "ComboBox.buttonArrowColor" );
 		uiKeyMapping.put( "ComboBox.ArrowButton.nonEditableBackground", "ComboBox.buttonBackground" );
+		uiKeyCopying.put( "ComboBox.buttonSeparatorColor",              "Component.borderColor" );
+		uiKeyCopying.put( "ComboBox.buttonDisabledSeparatorColor",      "Component.disabledBorderColor" );
 
 		// Component
 		uiKeyMapping.put( "Component.inactiveErrorFocusColor",   "Component.error.borderColor" );
@@ -574,6 +625,15 @@ public class IntelliJTheme
 		uiKeyCopying.put( "Slider.thumbColor", "ProgressBar.foreground" );
 		uiKeyCopying.put( "Slider.trackColor", "ProgressBar.background" );
 
+		// Spinner
+		uiKeyCopying.put( "Spinner.buttonSeparatorColor",         "Component.borderColor" );
+		uiKeyCopying.put( "Spinner.buttonDisabledSeparatorColor", "Component.disabledBorderColor" );
+
+		// TabbedPane
+		uiKeyCopying.put( "TabbedPane.selectedBackground",     "DefaultTabs.underlinedTabBackground" );
+		uiKeyCopying.put( "TabbedPane.selectedForeground",     "DefaultTabs.underlinedTabForeground" );
+		uiKeyCopying.put( "TabbedPane.inactiveUnderlineColor", "DefaultTabs.inactiveUnderlineColor" );
+
 		// TitlePane
 		uiKeyCopying.put( "TitlePane.inactiveBackground",     "TitlePane.background" );
 		uiKeyMapping.put( "TitlePane.infoForeground",         "TitlePane.foreground" );
@@ -598,7 +658,7 @@ public class IntelliJTheme
 		checkboxKeyMapping.put( "Checkbox.Background.Selected", "CheckBox.icon.selectedBackground" );
 		checkboxKeyMapping.put( "Checkbox.Border.Selected",     "CheckBox.icon.selectedBorderColor" );
 		checkboxKeyMapping.put( "Checkbox.Foreground.Selected", "CheckBox.icon.checkmarkColor" );
-		checkboxKeyMapping.put( "Checkbox.Focus.Thin.Selected", "CheckBox.icon.selectedFocusedBorderColor" );
+		checkboxKeyMapping.put( "Checkbox.Focus.Thin.Selected", "CheckBox.icon.focusedSelectedBorderColor" );
 
 		checkboxDuplicateColors.put( "Checkbox.Background.Default.Dark", "Checkbox.Background.Selected.Dark" );
 		checkboxDuplicateColors.put( "Checkbox.Border.Default.Dark",     "Checkbox.Border.Selected.Dark" );

flatlaf-core/src/main/java/com/formdev/flatlaf/LinuxFontPolicy.java

@@ -17,6 +17,7 @@
 package com.formdev.flatlaf;
 
 import java.awt.Font;
+import java.awt.FontMetrics;
 import java.awt.GraphicsConfiguration;
 import java.awt.GraphicsEnvironment;
 import java.awt.Toolkit;
@@ -28,7 +29,7 @@ import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 import java.util.StringTokenizer;
-
+import javax.swing.text.StyleContext;
 import com.formdev.flatlaf.util.LoggingFacade;
 import com.formdev.flatlaf.util.StringUtils;
 import com.formdev.flatlaf.util.SystemInfo;
@@ -55,24 +56,38 @@ class LinuxFontPolicy
 
 		String family = "";
 		int style = Font.PLAIN;
-		int size = 10;
+		double dsize = 10;
 
+		// parse pango font description
+		// see https://developer.gnome.org/pango/1.46/pango-Fonts.html#pango-font-description-from-string
 		StringTokenizer st = new StringTokenizer( (String) fontName );
 		while( st.hasMoreTokens() ) {
 			String word = st.nextToken();
 
-			if( word.equalsIgnoreCase( "italic" ) )
+			// remove trailing ',' (e.g. in "Ubuntu Condensed, 11" or "Ubuntu Condensed, Bold 11")
+			if( word.endsWith( "," ) )
+				word = word.substring( 0, word.length() - 1 ).trim();
+
+			String lword = word.toLowerCase();
+			if( lword.equals( "italic" ) || lword.equals( "oblique" ) )
 				style |= Font.ITALIC;
-			else if( word.equalsIgnoreCase( "bold" ) )
+			else if( lword.equals( "bold" ) )
 				style |= Font.BOLD;
 			else if( Character.isDigit( word.charAt( 0 ) ) ) {
 				try {
-					size = Integer.parseInt( word );
+					dsize = Double.parseDouble( word );
 				} catch( NumberFormatException ex ) {
 					// ignore
 				}
-			} else
+			} else {
+				// remove '-' from "Semi-Bold", "Extra-Light", etc
+				if( lword.startsWith( "semi-" ) || lword.startsWith( "demi-" ) )
+					word = word.substring( 0, 4 ) + word.substring( 5 );
+				else if( lword.startsWith( "extra-" ) || lword.startsWith( "ultra-" ) )
+					word = word.substring( 0, 5 ) + word.substring( 6 );
+
 				family = family.isEmpty() ? word : (family + ' ' + word);
+			}
 		}
 
 		// Ubuntu font is rendered poorly (except if running in JetBrains VM)
@@ -83,8 +98,8 @@ class LinuxFontPolicy
 		  family = "Liberation Sans";
 
 		// scale font size
-		double dsize = size * getGnomeFontScale();
-		size = (int) (dsize + 0.5);
+		dsize *= getGnomeFontScale();
+		int size = (int) (dsize + 0.5);
 		if( size < 1 )
 			size = 1;
 
@@ -93,7 +108,48 @@ class LinuxFontPolicy
 		if( logicalFamily != null )
 			family = logicalFamily;
 
-		return createFont( family, style, size, dsize );
+		return createFontEx( family, style, size, dsize );
+	}
+
+	/**
+	 * Create a font for the given family, style and size.
+	 * If the font family does not match any font on the system,
+	 * then the last word (usually a font weight) from the family name is removed and tried again.
+	 * E.g. family 'URW Bookman Light' is not found, but 'URW Bookman' is found.
+	 * If still not found, then font of family 'Dialog' is returned.
+	 */
+	private static Font createFontEx( String family, int style, int size, double dsize ) {
+		for(;;) {
+			Font font = createFont( family, style, size, dsize );
+
+			if( Font.DIALOG.equals( family ) )
+				return font;
+
+			// if the font family does not match any font on the system, "Dialog" family is returned
+			if( !Font.DIALOG.equals( font.getFamily() ) ) {
+				// check for font problems
+				// - font height much larger than expected (e.g. font Inter; Oracle Java 8)
+				// - character width is zero (e.g. font Cantarell; Fedora; Oracle Java 8)
+				FontMetrics fm = StyleContext.getDefaultStyleContext().getFontMetrics( font );
+				if( fm.getHeight() > size * 2 || fm.stringWidth( "a" ) == 0 )
+					return createFont( Font.DIALOG, style, size, dsize );
+
+				return font;
+			}
+
+			// find last word in family
+			int index = family.lastIndexOf( ' ' );
+			if( index < 0 )
+				return createFont( Font.DIALOG, style, size, dsize );
+
+			// check whether last work contains some font weight (e.g. Ultra-Bold or Heavy)
+			String lastWord = family.substring( index + 1 ).toLowerCase();
+			if( lastWord.contains( "bold" ) || lastWord.contains( "heavy" ) || lastWord.contains( "black" ) )
+				style |= Font.BOLD;
+
+			// remove last word from family and try again
+			family = family.substring( 0, index );
+		}
 	}
 
 	private static Font createFont( String family, int style, int size, double dsize ) {
@@ -114,7 +170,7 @@ class LinuxFontPolicy
 
 		Object value = Toolkit.getDefaultToolkit().getDesktopProperty( "gnome.Xft/DPI" );
 		if( value instanceof Integer ) {
-			int dpi = ((Integer)value).intValue() / 1024;
+			int dpi = (Integer) value / 1024;
 			if( dpi == -1 )
 				dpi = 96;
 			if( dpi < 50 )
@@ -141,7 +197,7 @@ class LinuxFontPolicy
 	}
 
 	/**
-	 * Gets the default font for KDE for KDE configuration files.
+	 * Gets the default font for KDE from KDE configuration files.
 	 *
 	 * The Swing fonts are not updated when the user changes system font size
 	 * (System Settings > Fonts > Force Font DPI). A application restart is necessary.
@@ -222,7 +278,7 @@ class LinuxFontPolicy
 		// read config file
 		ArrayList<String> lines = new ArrayList<>( 200 );
 		try( BufferedReader reader = new BufferedReader( new FileReader( file ) ) ) {
-			String line = null;
+			String line;
 			while( (line = reader.readLine()) != null )
 				lines.add( line );
 		} catch( IOException ex ) {
@@ -265,6 +321,9 @@ class LinuxFontPolicy
 	 *   - running on JetBrains Runtime 11 or later and scaling is enabled in system Settings
 	 */
 	private static boolean isSystemScaling() {
+		if( GraphicsEnvironment.isHeadless() )
+			return true;
+
 		GraphicsConfiguration gc = GraphicsEnvironment.getLocalGraphicsEnvironment()
 			.getDefaultScreenDevice().getDefaultConfiguration();
 		return UIScale.getSystemScaleFactor( gc ) > 1;

flatlaf-core/src/main/java/com/formdev/flatlaf/MnemonicHandler.java

@@ -28,6 +28,7 @@ import java.awt.event.WindowEvent;
 import java.awt.event.WindowListener;
 import java.lang.ref.WeakReference;
 import javax.swing.AbstractButton;
+import javax.swing.JDialog;
 import javax.swing.JFrame;
 import javax.swing.JLabel;
 import javax.swing.JMenu;
@@ -137,10 +138,17 @@ class MnemonicHandler
 					// get menu bar and first menu
 					Component c = e.getComponent();
 					JRootPane rootPane = SwingUtilities.getRootPane( c );
-					Window window = (rootPane != null) ? SwingUtilities.getWindowAncestor( rootPane ) : null;
 					JMenuBar menuBar = (rootPane != null) ? rootPane.getJMenuBar() : null;
-					if( menuBar == null && window instanceof JFrame )
-						menuBar = ((JFrame)window).getJMenuBar();
+					if( menuBar == null ) {
+						// get menu bar from frame/dialog because there
+						// may be multiple nested root panes in a frame/dialog
+						// (e.g. each internal frame has its own root pane)
+						Window window = SwingUtilities.getWindowAncestor( c );
+						if( window instanceof JFrame )
+							menuBar = ((JFrame)window).getJMenuBar();
+						else if( window instanceof JDialog )
+							menuBar = ((JDialog)window).getJMenuBar();
+					}
 					JMenu firstMenu = (menuBar != null) ? menuBar.getMenu( 0 ) : null;
 
 					// select first menu and show mnemonics

flatlaf-core/src/main/java/com/formdev/flatlaf/SubMenuUsabilityHelper.java

@@ -0,0 +1,336 @@
+/*
+ * Copyright 2022 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf;
+
+import java.awt.AWTEvent;
+import java.awt.Color;
+import java.awt.Component;
+import java.awt.Container;
+import java.awt.Dimension;
+import java.awt.EventQueue;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.MouseInfo;
+import java.awt.Point;
+import java.awt.PointerInfo;
+import java.awt.Polygon;
+import java.awt.Rectangle;
+import java.awt.Toolkit;
+import java.awt.Window;
+import java.awt.event.MouseEvent;
+import javax.swing.JComponent;
+import javax.swing.JLayeredPane;
+import javax.swing.JMenu;
+import javax.swing.JPopupMenu;
+import javax.swing.MenuElement;
+import javax.swing.MenuSelectionManager;
+import javax.swing.RootPaneContainer;
+import javax.swing.SwingUtilities;
+import javax.swing.Timer;
+import javax.swing.UIManager;
+import javax.swing.event.ChangeEvent;
+import javax.swing.event.ChangeListener;
+import com.formdev.flatlaf.ui.FlatUIUtils;
+
+/**
+ * Improves usability of submenus by using a
+ * <a href="https://height.app/blog/guide-to-build-context-menus#safe-triangle">safe triangle</a>
+ * to avoid that the submenu closes while the user moves the mouse to it.
+ *
+ * @author Karl Tauber
+ */
+class SubMenuUsabilityHelper
+	implements ChangeListener
+{
+	private static final String KEY_USE_SAFE_TRIANGLE = "Menu.useSafeTriangle";
+	private static final String KEY_SHOW_SAFE_TRIANGLE = "FlatLaf.debug.menu.showSafeTriangle";
+
+	// Using a static field to ensure that there is only one instance in the system.
+	// Multiple instances would freeze the application.
+	// https://github.com/apache/netbeans/issues/4231#issuecomment-1179616607
+	private static SubMenuUsabilityHelper instance;
+
+	private SubMenuEventQueue subMenuEventQueue;
+	private SafeTrianglePainter safeTrianglePainter;
+	private boolean changePending;
+
+	// mouse location in screen coordinates
+	private int mouseX;
+	private int mouseY;
+
+	// target popup bounds in screen coordinates
+	private int targetX;
+	private int targetTopY;
+	private int targetBottomY;
+
+	private Rectangle invokerBounds;
+
+	static synchronized boolean install() {
+		if( instance != null )
+			return false;
+
+		instance = new SubMenuUsabilityHelper();
+		MenuSelectionManager.defaultManager().addChangeListener( instance );
+		return true;
+	}
+
+	static synchronized void uninstall() {
+		if( instance == null )
+			return;
+
+		MenuSelectionManager.defaultManager().removeChangeListener( instance );
+		instance.uninstallEventQueue();
+		instance = null;
+	}
+
+	@Override
+	public void stateChanged( ChangeEvent e ) {
+		if( !FlatUIUtils.getUIBoolean( KEY_USE_SAFE_TRIANGLE, true ))
+			return;
+
+		// handle menu selection change later, but only once in case of temporary changes
+		// e.g. moving mouse from one menu item to another one, fires two events:
+		//    1. old menu item is removed from menu selection
+		//    2. new menu item is added to menu selection
+		synchronized( this ) {
+			if( changePending )
+				return;
+			changePending = true;
+		}
+
+		EventQueue.invokeLater( () -> {
+			synchronized( this ) {
+				changePending = false;
+			}
+			menuSelectionChanged();
+		} );
+	}
+
+	private void menuSelectionChanged() {
+		MenuElement[] path = MenuSelectionManager.defaultManager().getSelectedPath();
+
+/*debug
+		System.out.println( "--- " + path.length );
+		for( int i = 0; i < path.length; i++ )
+			System.out.println( "   " + i + ": " + path[i].getClass().getName() );
+debug*/
+
+		// find submenu in menu selection
+		int subMenuIndex = findSubMenu( path );
+
+		// uninstall if there is no submenu in selection
+		if( subMenuIndex < 0 || subMenuIndex != path.length - 1 ) {
+			uninstallEventQueue();
+			return;
+		}
+
+		// get current mouse location
+		PointerInfo pointerInfo = MouseInfo.getPointerInfo();
+		Point mouseLocation = (pointerInfo != null) ? pointerInfo.getLocation() : new Point();
+		mouseX = mouseLocation.x;
+		mouseY = mouseLocation.y;
+
+		// check whether popup is showing, which is e.g. not the case if it is empty
+		JPopupMenu popup = (JPopupMenu) path[subMenuIndex];
+		if( !popup.isShowing() ) {
+			uninstallEventQueue();
+			return;
+		}
+
+		// get invoker screen bounds
+		Component invoker = popup.getInvoker();
+		invokerBounds = (invoker != null)
+			? new Rectangle( invoker.getLocationOnScreen(), invoker.getSize() )
+			: null;
+
+		// check whether mouse location is within invoker
+		if( invokerBounds != null && !invokerBounds.contains( mouseX, mouseY ) ) {
+			uninstallEventQueue();
+			return;
+		}
+
+		// compute top/bottom target locations
+		Point popupLocation = popup.getLocationOnScreen();
+		Dimension popupSize = popup.getSize();
+		targetX = (mouseX < popupLocation.x + (popupSize.width / 2))
+			? popupLocation.x
+			: popupLocation.x + popupSize.width;
+		targetTopY = popupLocation.y;
+		targetBottomY = popupLocation.y + popupSize.height;
+
+		// install own event queue to supress mouse events when mouse is moved within safe triangle
+		if( subMenuEventQueue == null )
+			subMenuEventQueue = new SubMenuEventQueue();
+
+		// create safe triangle painter
+		if( safeTrianglePainter == null && UIManager.getBoolean( KEY_SHOW_SAFE_TRIANGLE ) )
+			safeTrianglePainter = new SafeTrianglePainter( popup );
+	}
+
+	private void uninstallEventQueue() {
+		if( subMenuEventQueue != null ) {
+			subMenuEventQueue.uninstall();
+			subMenuEventQueue = null;
+		}
+
+		if( safeTrianglePainter != null ) {
+			safeTrianglePainter.uninstall();
+			safeTrianglePainter = null;
+		}
+	}
+
+	private int findSubMenu( MenuElement[] path ) {
+		for( int i = path.length - 1; i >= 1; i-- ) {
+			if( path[i] instanceof JPopupMenu &&
+				path[i - 1] instanceof JMenu &&
+				!((JMenu)path[i - 1]).isTopLevelMenu() )
+			  return i;
+		}
+		return -1;
+	}
+
+	private Polygon createSafeTriangle() {
+		return new Polygon(
+			new int[] { mouseX, targetX, targetX },
+			new int[] { mouseY, targetTopY, targetBottomY },
+			3 );
+	}
+
+	//---- class SubMenuEventQueue --------------------------------------------
+
+	private class SubMenuEventQueue
+		extends EventQueue
+	{
+		private Timer mouseUpdateTimer;
+		private Timer timeoutTimer;
+
+		private int newMouseX;
+		private int newMouseY;
+		private AWTEvent lastMouseEvent;
+
+		SubMenuEventQueue() {
+			// timer used to slightly delay update of mouse location used for safe triangle
+			mouseUpdateTimer = new Timer( 50, e -> {
+				mouseX = newMouseX;
+				mouseY = newMouseY;
+
+				if( safeTrianglePainter != null )
+					safeTrianglePainter.repaint();
+			} );
+			mouseUpdateTimer.setRepeats( false );
+
+			// timer used to timeout safe triangle when mouse stops moving
+			timeoutTimer = new Timer( 200, e -> {
+				if( invokerBounds != null && !invokerBounds.contains( newMouseX, newMouseY ) ) {
+					// post last mouse event, which selects menu item at mouse location
+					if( lastMouseEvent != null ) {
+						postEvent( lastMouseEvent );
+						lastMouseEvent = null;
+					}
+
+					uninstallEventQueue();
+					return;
+				}
+			} );
+			timeoutTimer.setRepeats( false );
+
+			Toolkit.getDefaultToolkit().getSystemEventQueue().push( this );
+		}
+
+		void uninstall() {
+			mouseUpdateTimer.stop();
+			mouseUpdateTimer = null;
+
+			timeoutTimer.stop();
+			timeoutTimer = null;
+
+			lastMouseEvent = null;
+
+			super.pop();
+		}
+
+		@Override
+		protected void dispatchEvent( AWTEvent e ) {
+			int id = e.getID();
+
+			if( e instanceof MouseEvent &&
+				(id == MouseEvent.MOUSE_MOVED || id == MouseEvent.MOUSE_DRAGGED) )
+			{
+				newMouseX = ((MouseEvent)e).getXOnScreen();
+				newMouseY = ((MouseEvent)e).getYOnScreen();
+
+				if( safeTrianglePainter != null )
+					safeTrianglePainter.repaint();
+
+				mouseUpdateTimer.stop();
+				timeoutTimer.stop();
+
+				// check whether mouse moved within safe triangle
+				if( createSafeTriangle().contains( newMouseX, newMouseY ) ) {
+					// update mouse location delayed (this changes the safe triangle)
+					mouseUpdateTimer.start();
+
+					timeoutTimer.start();
+
+					// remember last mouse event, which will be posted if the mouse stops moving
+					lastMouseEvent = e;
+
+					// ignore mouse event
+					return;
+				}
+
+				// update mouse location immediately (this changes the safe triangle)
+				mouseX = newMouseX;
+				mouseY = newMouseY;
+			}
+
+			super.dispatchEvent( e );
+		}
+	}
+
+	//---- class SafeTrianglePainter ------------------------------------------
+
+	private class SafeTrianglePainter
+		extends JComponent
+	{
+		SafeTrianglePainter( JPopupMenu popup ) {
+			Window window = SwingUtilities.windowForComponent( popup.getInvoker() );
+			if( window instanceof RootPaneContainer ) {
+				JLayeredPane layeredPane = ((RootPaneContainer)window).getLayeredPane();
+				setSize( layeredPane.getSize() );
+				layeredPane.add( this, Integer.valueOf( JLayeredPane.POPUP_LAYER + 1 ) );
+			}
+		}
+
+		void uninstall() {
+			Container parent = getParent();
+			if( parent != null ) {
+				parent.remove( this );
+				parent.repaint();
+			}
+		}
+
+		@Override
+		protected void paintComponent( Graphics g ) {
+			Point locationOnScreen = getLocationOnScreen();
+			g.translate( -locationOnScreen.x, -locationOnScreen.y );
+
+			g.setColor( Color.red );
+			((Graphics2D)g).draw( createSafeTriangle() );
+		}
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/UIDefaultsLoader.java

@@ -18,11 +18,16 @@ package com.formdev.flatlaf;
 
 import java.awt.Color;
 import java.awt.Dimension;
+import java.awt.Font;
 import java.awt.Insets;
 import java.io.File;
 import java.io.FileInputStream;
+import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
+import java.io.StreamTokenizer;
+import java.io.StringReader;
+import java.net.URL;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.HashMap;
@@ -33,8 +38,10 @@ import java.util.Map;
 import java.util.Map.Entry;
 import java.util.Properties;
 import java.util.function.Function;
+import javax.swing.Icon;
 import javax.swing.UIDefaults;
 import javax.swing.UIManager;
+import javax.swing.border.Border;
 import javax.swing.UIDefaults.ActiveValue;
 import javax.swing.UIDefaults.LazyValue;
 import javax.swing.plaf.ColorUIResource;
@@ -48,6 +55,7 @@ import com.formdev.flatlaf.util.DerivedColor;
 import com.formdev.flatlaf.util.GrayFilter;
 import com.formdev.flatlaf.util.HSLColor;
 import com.formdev.flatlaf.util.LoggingFacade;
+import com.formdev.flatlaf.util.SoftCache;
 import com.formdev.flatlaf.util.StringUtils;
 import com.formdev.flatlaf.util.SystemInfo;
 import com.formdev.flatlaf.util.UIScale;
@@ -72,8 +80,12 @@ class UIDefaultsLoader
 	private static final String OPTIONAL_PREFIX = "?";
 	private static final String WILDCARD_PREFIX = "*.";
 
+	static final String KEY_VARIABLES = "FlatLaf.internal.variables";
+
 	private static int parseColorDepth;
 
+	private static final SoftCache<String, Object> fontCache = new SoftCache<>();
+
 	static void loadDefaultsFromProperties( Class<?> lookAndFeelClass, List<FlatDefaultsAddon> addons,
 		Properties additionalDefaults, boolean dark, UIDefaults defaults )
 	{
@@ -146,6 +158,18 @@ class UIDefaultsLoader
 								properties.load( in );
 						}
 					}
+				} else if( source instanceof URL ) {
+					// load from package URL
+					URL packageUrl = (URL) source;
+					for( Class<?> lafClass : lafClasses ) {
+						URL propertiesUrl = new URL( packageUrl + lafClass.getSimpleName() + ".properties" );
+
+						try( InputStream in = propertiesUrl.openStream() ) {
+							properties.load( in );
+						} catch( FileNotFoundException ex ) {
+							// ignore
+						}
+					}
 				} else if( source instanceof File ) {
 					// load from folder
 					File folder = (File) source;
@@ -234,18 +258,24 @@ class UIDefaultsLoader
 			};
 
 			// parse and add properties to UI defaults
+			Map<String, String> variables = new HashMap<>( 50 );
 			for( Map.Entry<Object, Object> e : properties.entrySet() ) {
 				String key = (String) e.getKey();
-				if( key.startsWith( VARIABLE_PREFIX ) )
+				if( key.startsWith( VARIABLE_PREFIX ) ) {
+					variables.put( key, (String) e.getValue() );
 					continue;
+				}
 
 				String value = resolveValue( (String) e.getValue(), propertiesGetter );
 				try {
-					defaults.put( key, parseValue( key, value, null, resolver, addonClassLoaders ) );
+					defaults.put( key, parseValue( key, value, null, null, resolver, addonClassLoaders ) );
 				} catch( RuntimeException ex ) {
 					logParseError( key, value, ex, true );
 				}
 			}
+
+			// remember variables in defaults to allow using them in styles
+			defaults.put( KEY_VARIABLES, variables );
 		} catch( IOException ex ) {
 			LoggingFacade.INSTANCE.logSevere( "FlatLaf: Failed to load properties files.", ex );
 		}
@@ -288,87 +318,204 @@ class UIDefaultsLoader
 		return resolveValue( newValue, propertiesGetter );
 	}
 
-	enum ValueType { UNKNOWN, STRING, BOOLEAN, CHARACTER, INTEGER, FLOAT, BORDER, ICON, INSETS, DIMENSION, COLOR,
-		SCALEDINTEGER, SCALEDFLOAT, SCALEDINSETS, SCALEDDIMENSION, INSTANCE, CLASS, GRAYFILTER, NULL, LAZY }
+	static String resolveValueFromUIManager( String value ) {
+		if( value.startsWith( VARIABLE_PREFIX ) ) {
+			@SuppressWarnings( "unchecked" )
+			Map<String, String> variables = (Map<String, String>) UIManager.get( KEY_VARIABLES );
+			String newValue = (variables != null) ? variables.get( value ) : null;
+			if( newValue == null )
+				throw new IllegalArgumentException( "variable '" + value + "' not found" );
 
-	private static ValueType[] tempResultValueType = new ValueType[1];
+			return newValue;
+		}
 
-	static Object parseValue( String key, String value ) {
-		return parseValue( key, value, null, v -> v, Collections.emptyList() );
+		if( !value.startsWith( PROPERTY_PREFIX ) )
+			return value;
+
+		String key = value.substring( PROPERTY_PREFIX.length() );
+		Object newValue = UIManager.get( key );
+		if( newValue == null )
+			throw new IllegalArgumentException( "property '" + key + "' not found" );
+
+		// convert binary color to string
+		if( newValue instanceof Color ) {
+			Color color = (Color) newValue;
+			int alpha = color.getAlpha();
+			return String.format( (alpha != 255) ? "#%06x%02x" : "#%06x", color.getRGB() & 0xffffff, alpha );
+		}
+
+		throw new IllegalArgumentException( "property value type '" + newValue.getClass().getName() + "' not supported in references" );
 	}
 
-	static Object parseValue( String key, String value, ValueType[] resultValueType,
+	enum ValueType { UNKNOWN, STRING, BOOLEAN, CHARACTER, INTEGER, INTEGERORFLOAT, FLOAT, BORDER, ICON, INSETS, DIMENSION, COLOR, FONT,
+		SCALEDINTEGER, SCALEDFLOAT, SCALEDINSETS, SCALEDDIMENSION, INSTANCE, CLASS, GRAYFILTER, NULL, LAZY }
+
+	private static final ValueType[] tempResultValueType = new ValueType[1];
+	private static Map<Class<?>, ValueType> javaValueTypes;
+	private static Map<String, ValueType> knownValueTypes;
+
+	static Object parseValue( String key, String value, Class<?> valueType ) {
+		return parseValue( key, value, valueType, null, v -> v, Collections.emptyList() );
+	}
+
+	static Object parseValue( String key, String value, Class<?> javaValueType, ValueType[] resultValueType,
 		Function<String, String> resolver, List<ClassLoader> addonClassLoaders )
 	{
 		if( resultValueType == null )
 			resultValueType = tempResultValueType;
 
-		value = value.trim();
-
-		// null, false, true
-		switch( value ) {
-			case "null":	resultValueType[0] = ValueType.NULL; return null;
-			case "false":	resultValueType[0] = ValueType.BOOLEAN; return false;
-			case "true":	resultValueType[0] = ValueType.BOOLEAN; return true;
+		// do not parse styles here
+		if( key.startsWith( "[style]" ) ) {
+			resultValueType[0] = ValueType.STRING;
+			return value;
 		}
 
-		// check for function "lazy"
-		//     Syntax: lazy(uiKey)
-		if( value.startsWith( "lazy(" ) && value.endsWith( ")" ) ) {
-			resultValueType[0] = ValueType.LAZY;
-			String uiKey = value.substring( 5, value.length() - 1 ).trim();
-			return (LazyValue) t -> {
-				return lazyUIManagerGet( uiKey );
-			};
+		value = value.trim();
+
+		// null
+		if( value.equals( "null" ) || value.isEmpty() ) {
+			resultValueType[0] = ValueType.NULL;
+			return null;
+		}
+
+		// check for function "if"
+		//     Syntax: if(condition,trueValue,falseValue)
+		//       - condition: evaluates to true if:
+		//           - is not "null"
+		//           - is not "false"
+		//           - is not an integer with zero value
+		//       - trueValue: used if condition is true
+		//       - falseValue: used if condition is false
+		if( value.startsWith( "if(" ) && value.endsWith( ")" ) ) {
+			List<String> params = splitFunctionParams( value.substring( 3, value.length() - 1 ), ',' );
+			if( params.size() != 3 )
+				throwMissingParametersException( value );
+
+			boolean ifCondition = parseCondition( params.get( 0 ), resolver, addonClassLoaders );
+			String ifValue = params.get( ifCondition ? 1 : 2 );
+			return parseValue( key, resolver.apply( ifValue ), javaValueType, resultValueType, resolver, addonClassLoaders );
 		}
 
 		ValueType valueType = ValueType.UNKNOWN;
 
-		// check whether value type is specified in the value
-		if( value.startsWith( "#" ) )
-			valueType = ValueType.COLOR;
-		else if( value.startsWith( "\"" ) && value.endsWith( "\"" ) ) {
-			valueType = ValueType.STRING;
-			value = value.substring( 1, value.length() - 1 );
-		} else if( value.startsWith( TYPE_PREFIX ) ) {
-			int end = value.indexOf( TYPE_PREFIX_END );
-			if( end != -1 ) {
-				try {
-					String typeStr = value.substring( TYPE_PREFIX.length(), end );
-					valueType = ValueType.valueOf( typeStr.toUpperCase( Locale.ENGLISH ) );
+		if( javaValueType != null ) {
+			if( javaValueTypes == null ) {
+				// create lazy
+				javaValueTypes = new HashMap<>();
+				javaValueTypes.put( String.class, ValueType.STRING );
+				javaValueTypes.put( boolean.class, ValueType.BOOLEAN );
+				javaValueTypes.put( Boolean.class, ValueType.BOOLEAN );
+				javaValueTypes.put( char.class, ValueType.CHARACTER );
+				javaValueTypes.put( Character.class, ValueType.CHARACTER );
+				javaValueTypes.put( int.class, ValueType.INTEGER );
+				javaValueTypes.put( Integer.class, ValueType.INTEGER );
+				javaValueTypes.put( float.class, ValueType.FLOAT );
+				javaValueTypes.put( Float.class, ValueType.FLOAT );
+				javaValueTypes.put( Border.class, ValueType.BORDER );
+				javaValueTypes.put( Icon.class, ValueType.ICON );
+				javaValueTypes.put( Insets.class, ValueType.INSETS );
+				javaValueTypes.put( Dimension.class, ValueType.DIMENSION );
+				javaValueTypes.put( Color.class, ValueType.COLOR );
+				javaValueTypes.put( Font.class, ValueType.FONT );
+			}
 
-					// remove type from value
-					value = value.substring( end + TYPE_PREFIX_END.length() );
-				} catch( IllegalArgumentException ex ) {
-					// ignore
+			// map java value type to parser value type
+			valueType = javaValueTypes.get( javaValueType );
+			if( valueType == null )
+				throw new IllegalArgumentException( "unsupported value type '" + javaValueType.getName() + "'" );
+
+			// remove '"' from strings
+			if( valueType == ValueType.STRING && value.startsWith( "\"" ) && value.endsWith( "\"" ) )
+				value = value.substring( 1, value.length() - 1 );
+		} else {
+			// false, true
+			switch( value ) {
+				case "false":	resultValueType[0] = ValueType.BOOLEAN; return false;
+				case "true":	resultValueType[0] = ValueType.BOOLEAN; return true;
+			}
+
+			// check for function "lazy"
+			//     Syntax: lazy(uiKey)
+			if( value.startsWith( "lazy(" ) && value.endsWith( ")" ) ) {
+				resultValueType[0] = ValueType.LAZY;
+				String uiKey = StringUtils.substringTrimmed( value, 5, value.length() - 1 );
+				return (LazyValue) t -> {
+					return lazyUIManagerGet( uiKey );
+				};
+			}
+
+			// check whether value type is specified in the value
+			if( value.startsWith( "#" ) )
+				valueType = ValueType.COLOR;
+			else if( value.startsWith( TYPE_PREFIX ) ) {
+				int end = value.indexOf( TYPE_PREFIX_END );
+				if( end != -1 ) {
+					try {
+						String typeStr = value.substring( TYPE_PREFIX.length(), end );
+						valueType = ValueType.valueOf( typeStr.toUpperCase( Locale.ENGLISH ) );
+
+						// remove type from value
+						value = value.substring( end + TYPE_PREFIX_END.length() );
+					} catch( IllegalArgumentException ex ) {
+						// ignore
+					}
 				}
 			}
-		}
 
-		// determine value type from key
-		if( valueType == ValueType.UNKNOWN ) {
-			if( key.endsWith( "UI" ) )
-				valueType = ValueType.STRING;
-			else if( key.endsWith( "Color" ) ||
-				(key.endsWith( "ground" ) &&
-				 (key.endsWith( ".background" ) || key.endsWith( "Background" ) ||
-				  key.endsWith( ".foreground" ) || key.endsWith( "Foreground" ))) )
-				valueType = ValueType.COLOR;
-			else if( key.endsWith( ".border" ) || key.endsWith( "Border" ) )
-				valueType = ValueType.BORDER;
-			else if( key.endsWith( ".icon" ) || key.endsWith( "Icon" ) )
-				valueType = ValueType.ICON;
-			else if( key.endsWith( ".margin" ) || key.endsWith( ".padding" ) ||
-					 key.endsWith( "Margins" ) || key.endsWith( "Insets" ) )
-				valueType = ValueType.INSETS;
-			else if( key.endsWith( "Size" ) )
-				valueType = ValueType.DIMENSION;
-			else if( key.endsWith( "Width" ) || key.endsWith( "Height" ) )
-				valueType = ValueType.INTEGER;
-			else if( key.endsWith( "Char" ) )
-				valueType = ValueType.CHARACTER;
-			else if( key.endsWith( "grayFilter" ) )
-				valueType = ValueType.GRAYFILTER;
+			if( valueType == ValueType.UNKNOWN ) {
+				if( knownValueTypes == null ) {
+					// create lazy
+					knownValueTypes = new HashMap<>();
+					// system colors
+					knownValueTypes.put( "activeCaptionBorder", ValueType.COLOR );
+					knownValueTypes.put( "inactiveCaptionBorder", ValueType.COLOR );
+					knownValueTypes.put( "windowBorder", ValueType.COLOR );
+					// SplitPane
+					knownValueTypes.put( "SplitPane.dividerSize", ValueType.INTEGER );
+					knownValueTypes.put( "SplitPaneDivider.gripDotSize", ValueType.INTEGER );
+					knownValueTypes.put( "dividerSize", ValueType.INTEGER );
+					knownValueTypes.put( "gripDotSize", ValueType.INTEGER );
+					// TabbedPane
+					knownValueTypes.put( "TabbedPane.closeCrossPlainSize", ValueType.FLOAT );
+					knownValueTypes.put( "TabbedPane.closeCrossFilledSize", ValueType.FLOAT );
+					knownValueTypes.put( "closeCrossPlainSize", ValueType.FLOAT );
+					knownValueTypes.put( "closeCrossFilledSize", ValueType.FLOAT );
+					// Table
+					knownValueTypes.put( "Table.intercellSpacing", ValueType.DIMENSION );
+					knownValueTypes.put( "intercellSpacing", ValueType.DIMENSION );
+				}
+
+				valueType = knownValueTypes.getOrDefault( key, ValueType.UNKNOWN );
+			}
+
+			// determine value type from key
+			if( valueType == ValueType.UNKNOWN ) {
+				if( key.endsWith( "UI" ) )
+					valueType = ValueType.STRING;
+				else if( key.endsWith( "Color" ) ||
+					(key.endsWith( "ground" ) &&
+					 (key.endsWith( ".background" ) || key.endsWith( "Background" ) || key.equals( "background" ) ||
+					  key.endsWith( ".foreground" ) || key.endsWith( "Foreground" ) || key.equals( "foreground" ))) )
+					valueType = ValueType.COLOR;
+				else if( key.endsWith( ".font" ) || key.endsWith( "Font" ) || key.equals( "font" ) )
+					valueType = ValueType.FONT;
+				else if( key.endsWith( ".border" ) || key.endsWith( "Border" ) || key.equals( "border" ) )
+					valueType = ValueType.BORDER;
+				else if( key.endsWith( ".icon" ) || key.endsWith( "Icon" ) || key.equals( "icon" ) )
+					valueType = ValueType.ICON;
+				else if( key.endsWith( ".margin" ) || key.equals( "margin" ) ||
+						 key.endsWith( ".padding" ) || key.equals( "padding" ) ||
+						 key.endsWith( "Margins" ) || key.endsWith( "Insets" ) )
+					valueType = ValueType.INSETS;
+				else if( key.endsWith( "Size" ) )
+					valueType = ValueType.DIMENSION;
+				else if( key.endsWith( "Width" ) || key.endsWith( "Height" ) )
+					valueType = ValueType.INTEGERORFLOAT;
+				else if( key.endsWith( "Char" ) )
+					valueType = ValueType.CHARACTER;
+				else if( key.endsWith( "grayFilter" ) )
+					valueType = ValueType.GRAYFILTER;
+			}
 		}
 
 		resultValueType[0] = valueType;
@@ -376,14 +523,17 @@ class UIDefaultsLoader
 		// parse value
 		switch( valueType ) {
 			case STRING:		return value;
+			case BOOLEAN:		return parseBoolean( value );
 			case CHARACTER:		return parseCharacter( value );
 			case INTEGER:		return parseInteger( value, true );
+			case INTEGERORFLOAT:return parseIntegerOrFloat( value, true );
 			case FLOAT:			return parseFloat( value, true );
 			case BORDER:		return parseBorder( value, resolver, addonClassLoaders );
 			case ICON:			return parseInstance( value, addonClassLoaders );
 			case INSETS:		return parseInsets( value );
 			case DIMENSION:		return parseDimension( value );
 			case COLOR:			return parseColorOrFunction( value, resolver, true );
+			case FONT:			return parseFont( value );
 			case SCALEDINTEGER:	return parseScaledInteger( value );
 			case SCALEDFLOAT:	return parseScaledFloat( value );
 			case SCALEDINSETS:	return parseScaledInsets( value );
@@ -393,6 +543,12 @@ class UIDefaultsLoader
 			case GRAYFILTER:	return parseGrayFilter( value );
 			case UNKNOWN:
 			default:
+				// string
+				if( value.startsWith( "\"" ) && value.endsWith( "\"" ) ) {
+					resultValueType[0] = ValueType.STRING;
+					return value.substring( 1, value.length() - 1 );
+				}
+
 				// colors
 				Object color = parseColorOrFunction( value, resolver, false );
 				if( color != null ) {
@@ -420,19 +576,34 @@ class UIDefaultsLoader
 		}
 	}
 
+	private static boolean parseCondition( String condition,
+		Function<String, String> resolver, List<ClassLoader> addonClassLoaders )
+	{
+		try {
+			Object conditionValue = parseValue( "", resolver.apply( condition ), null, null, resolver, addonClassLoaders );
+			return (conditionValue != null &&
+				!conditionValue.equals( false ) &&
+				!conditionValue.equals( 0 ) );
+		} catch( IllegalArgumentException ex ) {
+			// ignore errors (e.g. variable or property not found) and evaluate to false
+			return false;
+		}
+	}
+
 	private static Object parseBorder( String value, Function<String, String> resolver, List<ClassLoader> addonClassLoaders ) {
 		if( value.indexOf( ',' ) >= 0 ) {
-			// top,left,bottom,right[,lineColor[,lineThickness]]
-			List<String> parts = split( value, ',' );
+			// top,left,bottom,right[,lineColor[,lineThickness[,arc]]]
+			List<String> parts = splitFunctionParams( value, ',' );
 			Insets insets = parseInsets( value );
 			ColorUIResource lineColor = (parts.size() >= 5)
 				? (ColorUIResource) parseColorOrFunction( resolver.apply( parts.get( 4 ) ), resolver, true )
 				: null;
-			float lineThickness = (parts.size() >= 6) ? parseFloat( parts.get( 5 ), true ) : 1f;
+			float lineThickness = (parts.size() >= 6 && !parts.get( 5 ).isEmpty()) ? parseFloat( parts.get( 5 ), true ) : 1f;
+			int arc = (parts.size() >= 7) ? parseInteger( parts.get( 6 ), true ) : 0;
 
 			return (LazyValue) t -> {
 				return (lineColor != null)
-					? new FlatLineBorder( insets, lineColor, lineThickness )
+					? new FlatLineBorder( insets, lineColor, lineThickness, arc )
 					: new FlatEmptyBorder( insets );
 			};
 		} else
@@ -442,8 +613,8 @@ class UIDefaultsLoader
 	private static Object parseInstance( String value, List<ClassLoader> addonClassLoaders ) {
 		return (LazyValue) t -> {
 			try {
-				return findClass( value, addonClassLoaders ).newInstance();
-			} catch( InstantiationException | IllegalAccessException | ClassNotFoundException ex ) {
+				return findClass( value, addonClassLoaders ).getDeclaredConstructor().newInstance();
+			} catch( Exception ex ) {
 				LoggingFacade.INSTANCE.logSevere( "FlatLaf: Failed to instantiate '" + value + "'.", ex );
 				return null;
 			}
@@ -480,7 +651,7 @@ class UIDefaultsLoader
 	}
 
 	private static Insets parseInsets( String value ) {
-		List<String> numbers = split( value, ',' );
+		List<String> numbers = StringUtils.split( value, ',', true, false );
 		try {
 			return new InsetsUIResource(
 				Integer.parseInt( numbers.get( 0 ) ),
@@ -493,7 +664,7 @@ class UIDefaultsLoader
 	}
 
 	private static Dimension parseDimension( String value ) {
-		List<String> numbers = split( value, ',' );
+		List<String> numbers = StringUtils.split( value, ',', true, false );
 		try {
 			return new DimensionUIResource(
 				Integer.parseInt( numbers.get( 0 ) ),
@@ -581,10 +752,10 @@ class UIDefaultsLoader
 			return null;
 		}
 
-		String function = value.substring( 0, paramsStart ).trim();
+		String function = StringUtils.substringTrimmed( value, 0, paramsStart );
 		List<String> params = splitFunctionParams( value.substring( paramsStart + 1, value.length() - 1 ), ',' );
 		if( params.isEmpty() )
-			throw new IllegalArgumentException( "missing parameters in function '" + value + "'" );
+			throwMissingParametersException( value );
 
 		if( parseColorDepth > 100 )
 			throw new IllegalArgumentException( "endless recursion in color function '" + value + "'" );
@@ -592,6 +763,7 @@ class UIDefaultsLoader
 		parseColorDepth++;
 		try {
 			switch( function ) {
+				case "if":			return parseColorIf( value, params, resolver, reportError );
 				case "rgb":			return parseColorRgbOrRgba( false, params, resolver, reportError );
 				case "rgba":		return parseColorRgbOrRgba( true, params, resolver, reportError );
 				case "hsl":			return parseColorHslOrHsla( false, params );
@@ -604,6 +776,15 @@ class UIDefaultsLoader
 				case "fadeout":		return parseColorHSLIncreaseDecrease( 3, false, params, resolver, reportError );
 				case "fade":		return parseColorFade( params, resolver, reportError );
 				case "spin":		return parseColorSpin( params, resolver, reportError );
+				case "changeHue":		return parseColorChange( 0, params, resolver, reportError );
+				case "changeSaturation":return parseColorChange( 1, params, resolver, reportError );
+				case "changeLightness":	return parseColorChange( 2, params, resolver, reportError );
+				case "changeAlpha":		return parseColorChange( 3, params, resolver, reportError );
+				case "mix":				return parseColorMix( null, params, resolver, reportError );
+				case "tint":			return parseColorMix( "#fff", params, resolver, reportError );
+				case "shade":			return parseColorMix( "#000", params, resolver, reportError );
+				case "contrast":		return parseColorContrast( params, resolver, reportError );
+				case "over":			return parseColorOver( params, resolver, reportError );
 			}
 		} finally {
 			parseColorDepth--;
@@ -612,6 +793,21 @@ class UIDefaultsLoader
 		throw new IllegalArgumentException( "unknown color function '" + value + "'" );
 	}
 
+	/**
+	 * Syntax: if(condition,trueValue,falseValue)
+	 * <p>
+	 * This "if" function is only used if the "if" is passed as parameter to another
+	 * color function. Otherwise, the general "if" function is used.
+	 */
+	private static Object parseColorIf( String value, List<String> params, Function<String, String> resolver, boolean reportError ) {
+		if( params.size() != 3 )
+			throwMissingParametersException( value );
+
+		boolean ifCondition = parseCondition( params.get( 0 ), resolver, Collections.emptyList() );
+		String ifValue = params.get( ifCondition ? 1 : 2 );
+		return parseColorOrFunction( resolver.apply( ifValue ), resolver, reportError );
+	}
+
 	/**
 	 * Syntax: rgb(red,green,blue) or rgba(red,green,blue,alpha)
 	 *   - red:   an integer 0-255 or a percentage 0-100%
@@ -656,7 +852,7 @@ class UIDefaultsLoader
 		int lightness = parsePercentage( params.get( 2 ) );
 		int alpha = hasAlpha ? parsePercentage( params.get( 3 ) ) : 100;
 
-		float[] hsl = new float[] { hue, saturation, lightness };
+		float[] hsl = { hue, saturation, lightness };
 		return new ColorUIResource( HSLColor.toRGB( hsl, alpha / 100f ) );
 	}
 
@@ -711,21 +907,32 @@ class UIDefaultsLoader
 	 * Syntax: fade(color,amount[,options])
 	 *   - color: a color (e.g. #f00) or a color function
 	 *   - amount: percentage 0-100%
-	 *   - options: [derived]
+	 *   - options: [derived] [lazy]
 	 */
 	private static Object parseColorFade( List<String> params, Function<String, String> resolver, boolean reportError ) {
 		String colorStr = params.get( 0 );
 		int amount = parsePercentage( params.get( 1 ) );
 		boolean derived = false;
+		boolean lazy = false;
 
 		if( params.size() > 2 ) {
 			String options = params.get( 2 );
 			derived = options.contains( "derived" );
+			lazy = options.contains( "lazy" );
 		}
 
 		// create function
 		ColorFunction function = new ColorFunctions.Fade( amount );
 
+		if( lazy ) {
+			return (LazyValue) t -> {
+				Object color = lazyUIManagerGet( colorStr );
+				return (color instanceof Color)
+					? new ColorUIResource( ColorFunctions.applyFunctions( (Color) color, function ) )
+					: null;
+			};
+		}
+
 		// parse base color, apply function and create derived color
 		return parseFunctionBaseColor( colorStr, function, derived, resolver, reportError );
 	}
@@ -753,6 +960,120 @@ class UIDefaultsLoader
 		return parseFunctionBaseColor( colorStr, function, derived, resolver, reportError );
 	}
 
+	/**
+	 * Syntax: changeHue(color,value[,options]) or
+	 *         changeSaturation(color,value[,options]) or
+	 *         changeLightness(color,value[,options]) or
+	 *         changeAlpha(color,value[,options])
+	 *   - color: a color (e.g. #f00) or a color function
+	 *   - value: for hue: number of degrees; otherwise: percentage 0-100%
+	 *   - options: [derived]
+	 */
+	private static Object parseColorChange( int hslIndex,
+		List<String> params, Function<String, String> resolver, boolean reportError )
+	{
+		String colorStr = params.get( 0 );
+		int value = (hslIndex == 0)
+			? parseInteger( params.get( 1 ), true )
+			: parsePercentage( params.get( 1 ) );
+		boolean derived = false;
+
+		if( params.size() > 2 ) {
+			String options = params.get( 2 );
+			derived = options.contains( "derived" );
+		}
+
+		// create function
+		ColorFunction function = new ColorFunctions.HSLChange( hslIndex, value );
+
+		// parse base color, apply function and create derived color
+		return parseFunctionBaseColor( colorStr, function, derived, resolver, reportError );
+	}
+
+	/**
+	 * Syntax: mix(color1,color2[,weight]) or
+	 *         tint(color[,weight]) or
+	 *         shade(color[,weight])
+	 *   - color1: a color (e.g. #f00) or a color function
+	 *   - color2: a color (e.g. #f00) or a color function
+	 *   - weight: the weight (in range 0-100%) to mix the two colors
+	 *             larger weight uses more of first color, smaller weight more of second color
+	 */
+	private static Object parseColorMix( String color1Str, List<String> params, Function<String, String> resolver, boolean reportError ) {
+		int i = 0;
+		if( color1Str == null )
+			color1Str = params.get( i++ );
+		String color2Str = params.get( i++ );
+		int weight = (params.size() > i) ? parsePercentage( params.get( i ) ) : 50;
+
+		// parse second color
+		ColorUIResource color2 = (ColorUIResource) parseColorOrFunction( resolver.apply( color2Str ), resolver, reportError );
+		if( color2 == null )
+			return null;
+
+		// create function
+		ColorFunction function = new ColorFunctions.Mix( color2, weight );
+
+		// parse first color, apply function and create mixed color
+		return parseFunctionBaseColor( color1Str, function, false, resolver, reportError );
+	}
+
+	/**
+	 * Syntax: contrast(color,dark,light[,threshold])
+	 *   - color: a color to compare against
+	 *   - dark: a designated dark color (e.g. #000) or a color function
+	 *   - light: a designated light color (e.g. #fff) or a color function
+	 *   - threshold: the threshold (in range 0-100%) to specify where the transition
+	 *                from "dark" to "light" is (default is 43%)
+	 */
+	private static Object parseColorContrast( List<String> params, Function<String, String> resolver, boolean reportError ) {
+		String colorStr = params.get( 0 );
+		String darkStr = params.get( 1 );
+		String lightStr = params.get( 2 );
+		int threshold = (params.size() > 3) ? parsePercentage( params.get( 3 ) ) : 43;
+
+		// parse color to compare against
+		ColorUIResource color = (ColorUIResource) parseColorOrFunction( resolver.apply( colorStr ), resolver, reportError );
+		if( color == null )
+			return null;
+
+		// check luma and determine whether to use dark or light color
+		String darkOrLightColor = (ColorFunctions.luma( color ) * 100 < threshold)
+			? lightStr
+			: darkStr;
+
+		// parse dark or light color
+		return parseColorOrFunction( resolver.apply( darkOrLightColor ), resolver, reportError );
+	}
+
+	/**
+	 * Syntax: over(foreground,background)
+	 *   - foreground: a foreground color (e.g. #f00) or a color function;
+	 *                 the alpha of this color is used as weight to mix the two colors
+	 *   - background: a background color (e.g. #f00) or a color function
+	 */
+	private static ColorUIResource parseColorOver( List<String> params, Function<String, String> resolver, boolean reportError ) {
+		String foregroundStr = params.get( 0 );
+		String backgroundStr = params.get( 1 );
+
+		// parse foreground color
+		ColorUIResource foreground = (ColorUIResource) parseColorOrFunction( resolver.apply( foregroundStr ), resolver, reportError );
+		if( foreground == null || foreground.getAlpha() == 255 )
+			return foreground;
+
+		// foreground color without alpha
+		ColorUIResource foreground2 = new ColorUIResource( foreground.getRGB() );
+
+		// parse background color
+		ColorUIResource background = (ColorUIResource) parseColorOrFunction( resolver.apply( backgroundStr ), resolver, reportError );
+		if( background == null )
+			return foreground2;
+
+		// create new color
+		float weight = foreground.getAlpha() / 255f;
+		return new ColorUIResource( ColorFunctions.mix( foreground2, background, weight ) );
+	}
+
 	private static Object parseFunctionBaseColor( String colorStr, ColorFunction function,
 		boolean derived, Function<String, String> resolver, boolean reportError )
 	{
@@ -783,6 +1104,107 @@ class UIDefaultsLoader
 		return new ColorUIResource( newColor );
 	}
 
+	/**
+	 * Syntax: [normal] [bold|+bold|-bold] [italic|+italic|-italic] [<size>|+<incr>|-<decr>|<percent>%] [family[, family]] [$baseFontKey]
+	 */
+	private static Object parseFont( String value ) {
+		Object font = fontCache.get( value );
+		if( font != null )
+			return font;
+
+		int style = -1;
+		int styleChange = 0;
+		int absoluteSize = 0;
+		int relativeSize = 0;
+		float scaleSize = 0;
+		List<String> families = null;
+		String baseFontKey = null;
+
+		// use StreamTokenizer to split string because it supports quoted strings
+		StreamTokenizer st = new StreamTokenizer( new StringReader( value ) );
+		st.resetSyntax();
+		st.wordChars( ' ' + 1, 255 );
+		st.whitespaceChars( 0, ' ' );
+		st.whitespaceChars( ',', ',' ); // ignore ','
+		st.quoteChar( '"' );
+		st.quoteChar( '\'' );
+
+		try {
+			while( st.nextToken() != StreamTokenizer.TT_EOF ) {
+				String param = st.sval;
+				switch( param ) {
+					// font style
+					case "normal":
+						style = 0;
+						break;
+
+					case "bold":
+						if( style == -1 )
+							style = 0;
+						style |= Font.BOLD;
+						break;
+
+					case "italic":
+						if( style == -1 )
+							style = 0;
+						style |= Font.ITALIC;
+						break;
+
+					case "+bold":   styleChange |= Font.BOLD; break;
+					case "-bold":   styleChange |= Font.BOLD << 16; break;
+					case "+italic": styleChange |= Font.ITALIC; break;
+					case "-italic": styleChange |= Font.ITALIC << 16; break;
+
+					default:
+						char firstChar = param.charAt( 0 );
+						if( Character.isDigit( firstChar ) || firstChar == '+' || firstChar == '-' ) {
+							// font size
+							if( absoluteSize != 0 || relativeSize != 0 || scaleSize != 0 )
+								throw new IllegalArgumentException( "size specified more than once in '" + value + "'" );
+
+							if( firstChar == '+' || firstChar == '-' )
+								relativeSize = parseInteger( param, true );
+							else if( param.endsWith( "%" ) )
+								scaleSize = parseInteger( param.substring( 0, param.length() - 1 ), true ) / 100f;
+							else
+								absoluteSize = parseInteger( param, true );
+						} else if( firstChar == '$' ) {
+							// reference to base font
+							if( baseFontKey != null )
+								throw new IllegalArgumentException( "baseFontKey specified more than once in '" + value + "'" );
+
+							baseFontKey = param.substring( 1 );
+						} else {
+							// font family
+							if( families == null )
+								families = Collections.singletonList( param );
+							else {
+								if( families.size() == 1 )
+									families = new ArrayList<>( families );
+								families.add( param );
+							}
+						}
+						break;
+				}
+			}
+		} catch( IOException ex ) {
+			throw new IllegalArgumentException( ex );
+		}
+
+		if( style != -1 && styleChange != 0 )
+			throw new IllegalArgumentException( "can not mix absolute style (e.g. 'bold') with derived style (e.g. '+italic') in '" + value + "'" );
+		if( styleChange != 0 ) {
+			if( (styleChange & Font.BOLD) != 0 && (styleChange & (Font.BOLD << 16)) != 0 )
+				throw new IllegalArgumentException( "can not use '+bold' and '-bold' in '" + value + "'" );
+			if( (styleChange & Font.ITALIC) != 0 && (styleChange & (Font.ITALIC << 16)) != 0 )
+				throw new IllegalArgumentException( "can not use '+italic' and '-italic' in '" + value + "'" );
+		}
+
+		font = new FlatLaf.ActiveFont( baseFontKey, families, style, styleChange, absoluteSize, relativeSize, scaleSize );
+		fontCache.put( value, font );
+		return font;
+	}
+
 	private static int parsePercentage( String value ) {
 		if( !value.endsWith( "%" ) )
 			throw new NumberFormatException( "invalid percentage '" + value + "'" );
@@ -799,6 +1221,14 @@ class UIDefaultsLoader
 		return val;
 	}
 
+	private static Boolean parseBoolean( String value ) {
+		switch( value ) {
+			case "false":	return false;
+			case "true":	return true;
+		}
+		throw new IllegalArgumentException( "invalid boolean '" + value + "'" );
+	}
+
 	private static Character parseCharacter( String value ) {
 		if( value.length() != 1 )
 			throw new IllegalArgumentException( "invalid character '" + value + "'" );
@@ -812,7 +1242,7 @@ class UIDefaultsLoader
 		}
 
 		Integer integer = parseInteger( value, true );
-		if( integer.intValue() < min || integer.intValue() > max )
+		if( integer < min || integer > max )
 			throw new NumberFormatException( "integer '" + value + "' out of range (" + min + '-' + max + ')' );
 		return integer;
 	}
@@ -827,6 +1257,20 @@ class UIDefaultsLoader
 		return null;
 	}
 
+	private static Number parseIntegerOrFloat( String value, boolean reportError ) {
+		try {
+			return Integer.parseInt( value );
+		} catch( NumberFormatException ex ) {
+			try {
+				return Float.parseFloat( value );
+			} catch( NumberFormatException ex2 ) {
+				if( reportError )
+					throw new NumberFormatException( "invalid integer or float '" + value + "'" );
+			}
+		}
+		return null;
+	}
+
 	private static Float parseFloat( String value, boolean reportError ) {
 		try {
 			return Float.parseFloat( value );
@@ -839,34 +1283,34 @@ class UIDefaultsLoader
 
 	private static ActiveValue parseScaledInteger( String value ) {
 		int val = parseInteger( value, true );
-		return (ActiveValue) t -> {
+		return t -> {
 			return UIScale.scale( val );
 		};
 	}
 
 	private static ActiveValue parseScaledFloat( String value ) {
 		float val = parseFloat( value, true );
-		return (ActiveValue) t -> {
+		return t -> {
 			return UIScale.scale( val );
 		};
 	}
 
 	private static ActiveValue parseScaledInsets( String value ) {
 		Insets insets = parseInsets( value );
-		return (ActiveValue) t -> {
+		return t -> {
 			return UIScale.scale( insets );
 		};
 	}
 
 	private static ActiveValue parseScaledDimension( String value ) {
 		Dimension dimension = parseDimension( value );
-		return (ActiveValue) t -> {
+		return t -> {
 			return UIScale.scale( dimension );
 		};
 	}
 
 	private static Object parseGrayFilter( String value ) {
-		List<String> numbers = split( value, ',' );
+		List<String> numbers = StringUtils.split( value, ',', true, false );
 		try {
 			int brightness = Integer.parseInt( numbers.get( 0 ) );
 			int contrast = Integer.parseInt( numbers.get( 1 ) );
@@ -880,20 +1324,6 @@ class UIDefaultsLoader
 		}
 	}
 
-	/**
-	 * Split string and trim parts.
-	 */
-	private static List<String> split( String str, char delim ) {
-		List<String> result = StringUtils.split( str, delim );
-
-		// trim strings
-		int size = result.size();
-		for( int i = 0; i < size; i++ )
-			result.set( i, result.get( i ).trim() );
-
-		return result;
-	}
-
 	/**
 	 * Splits function parameters and allows using functions as parameters.
 	 * In other words: Delimiters surrounded by '(' and ')' are ignored.
@@ -910,11 +1340,11 @@ class UIDefaultsLoader
 			else if( ch == ')' )
 				nestLevel--;
 			else if( nestLevel == 0 && ch == delim ) {
-				strs.add( str.substring( start, i ).trim() );
+				strs.add( StringUtils.substringTrimmed( str, start, i ) );
 				start = i + 1;
 			}
 		}
-		strs.add( str.substring( start ).trim() );
+		strs.add( StringUtils.substringTrimmed( str, start ) );
 
 		return strs;
 	}
@@ -923,7 +1353,7 @@ class UIDefaultsLoader
 	 * For use in LazyValue to get value for given key from UIManager and report error
 	 * if not found. If key is prefixed by '?', then no error is reported.
 	 */
-	private static Object lazyUIManagerGet( String uiKey ) {
+	static Object lazyUIManagerGet( String uiKey ) {
 		boolean optional = false;
 		if( uiKey.startsWith( OPTIONAL_PREFIX ) ) {
 			uiKey = uiKey.substring( OPTIONAL_PREFIX.length() );
@@ -935,4 +1365,8 @@ class UIDefaultsLoader
 			LoggingFacade.INSTANCE.logSevere( "FlatLaf: '" + uiKey + "' not found in UI defaults.", null );
 		return value;
 	}
+
+	private static void throwMissingParametersException( String value ) {
+		throw new IllegalArgumentException( "missing parameters in function '" + value + "'" );
+	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatAbstractIcon.java

@@ -39,7 +39,7 @@ public abstract class FlatAbstractIcon
 {
 	protected final int width;
 	protected final int height;
-	protected final Color color;
+	protected Color color;
 
 	public FlatAbstractIcon( int width, int height, Color color ) {
 		this.width = width;

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatAnimatedIcon.java

@@ -23,13 +23,13 @@ import java.awt.Graphics2D;
 import com.formdev.flatlaf.util.AnimatedIcon;
 
 /**
- * Base class for animated icons that scales width and height, creates and initializes
+ * Base class for animated icons that scale width and height, creates and initializes
  * a scaled graphics context for icon painting.
  * <p>
  * Subclasses do not need to scale icon painting.
  * <p>
  * This class does not store any state information (needed for animation) in its instance.
- * Instead a client property is set on the painted component.
+ * Instead, a client property is set on the painted component.
  * This makes it possible to use a share icon instance for multiple components.
  *
  * @author Karl Tauber

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatAscendingSortIcon.java

@@ -21,7 +21,11 @@ import java.awt.Color;
 import java.awt.Component;
 import java.awt.Graphics2D;
 import java.awt.geom.Path2D;
+import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
+import javax.swing.plaf.TableHeaderUI;
+import javax.swing.table.JTableHeader;
+import com.formdev.flatlaf.ui.FlatTableHeaderUI;
 import com.formdev.flatlaf.ui.FlatUIUtils;
 
 /**
@@ -35,8 +39,8 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
 public class FlatAscendingSortIcon
 	extends FlatAbstractIcon
 {
-	protected final boolean chevron = FlatUIUtils.isChevron( UIManager.getString( "Component.arrowType" ) );
-	protected final Color sortIconColor = UIManager.getColor( "Table.sortIconColor" );
+	protected boolean chevron = FlatUIUtils.isChevron( UIManager.getString( "Component.arrowType" ) );
+	protected Color sortIconColor = UIManager.getColor( "Table.sortIconColor" );
 
 	public FlatAscendingSortIcon() {
 		super( 10, 5, null );
@@ -44,7 +48,28 @@ public class FlatAscendingSortIcon
 
 	@Override
 	protected void paintIcon( Component c, Graphics2D g ) {
+		boolean chevron = this.chevron;
+		Color sortIconColor = this.sortIconColor;
+
+		// Because this icon is always shared for all table headers,
+		// get icon specific style from FlatTableHeaderUI.
+		JTableHeader tableHeader = (JTableHeader) SwingUtilities.getAncestorOfClass( JTableHeader.class, c );
+		if( tableHeader != null ) {
+			TableHeaderUI ui = tableHeader.getUI();
+			if( ui instanceof FlatTableHeaderUI ) {
+				FlatTableHeaderUI fui = (FlatTableHeaderUI) ui;
+				if( fui.arrowType != null )
+					chevron = FlatUIUtils.isChevron( fui.arrowType );
+				if( fui.sortIconColor != null )
+					sortIconColor = fui.sortIconColor;
+			}
+		}
+
 		g.setColor( sortIconColor );
+		paintArrow( c, g, chevron );
+	}
+
+	protected void paintArrow( Component c, Graphics2D g, boolean chevron ) {
 		if( chevron ) {
 			// chevron arrow
 			Path2D path = FlatUIUtils.createPath( false, 1,4, 5,0, 9,4 );

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatCapsLockIcon.java

@@ -16,12 +16,14 @@
 
 package com.formdev.flatlaf.icons;
 
+import java.awt.Color;
 import java.awt.Component;
 import java.awt.Graphics2D;
 import java.awt.geom.Path2D;
 import java.awt.geom.Rectangle2D;
 import java.awt.geom.RoundRectangle2D;
 import javax.swing.UIManager;
+import com.formdev.flatlaf.ui.FlatStylingSupport.UnknownStyleException;
 import com.formdev.flatlaf.ui.FlatUIUtils;
 
 /**
@@ -38,13 +40,30 @@ public class FlatCapsLockIcon
 		super( 16, 16, UIManager.getColor( "PasswordField.capsLockIconColor" ) );
 	}
 
+	/** @since 2 */
+	public Object applyStyleProperty( String key, Object value ) {
+		Object oldValue;
+		switch( key ) {
+			case "capsLockIconColor": oldValue = color; color = (Color) value; return oldValue;
+			default: throw new UnknownStyleException( key );
+		}
+	}
+
+	/** @since 2.5 */
+	public Object getStyleableValue( String key ) {
+		switch( key ) {
+			case "capsLockIconColor": return color;
+			default: return null;
+		}
+	}
+
 	@Override
 	protected void paintIcon( Component c, Graphics2D g ) {
 		/*
 			<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16">
 			  <g fill="none" fill-rule="evenodd">
 			    <rect width="16" height="16" fill="#6E6E6E" rx="3"/>
-			    <rect width="6" height="2" x="5" y="12" fill="#FFF"/>
+			    <rect width="6" height="2" x="5" y="11.5" fill="#FFF"/>
     			<path fill="#FFF" d="M2,8 L8,2 L14,8 L11,8 L11,10 L5,10 L5,8 L2,8 Z"/>
 			  </g>
 			</svg>
@@ -52,7 +71,7 @@ public class FlatCapsLockIcon
 
 		Path2D path = new Path2D.Float( Path2D.WIND_EVEN_ODD );
 		path.append( new RoundRectangle2D.Float( 0, 0, 16, 16, 6, 6 ), false );
-		path.append( new Rectangle2D.Float( 5, 12, 6, 2 ), false );
+		path.append( new Rectangle2D.Float( 5, 11.5f, 6, 2 ), false );
 		path.append( FlatUIUtils.createPath( 2,8, 8,2, 14,8, 11,8, 11,10, 5,10, 5,8 ), false );
 		g.fill( path );
 	}

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatCheckBoxIcon.java

@@ -23,83 +23,115 @@ import java.awt.Component;
 import java.awt.Graphics2D;
 import java.awt.geom.Path2D;
 import java.awt.geom.RoundRectangle2D;
+import java.util.Map;
 import javax.swing.AbstractButton;
 import javax.swing.JComponent;
 import javax.swing.UIManager;
 import com.formdev.flatlaf.ui.FlatButtonUI;
+import com.formdev.flatlaf.ui.FlatStylingSupport;
+import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
 import com.formdev.flatlaf.ui.FlatUIUtils;
 
 /**
  * Icon for {@link javax.swing.JCheckBox}.
- *
- * Note: If Component.focusWidth is greater than zero, then the outline focus border
+ * <p>
+ * <strong>Note</strong>:
+ *       If Component.focusWidth is greater than zero, then the outer focus border
  *       is painted outside of the icon bounds. Make sure that the checkbox
  *       has margins, which are equal or greater than focusWidth.
  *
- * @uiDefault CheckBox.icon.style						String	optional; "outline"/null (default) or "filled"
+ * @uiDefault CheckBox.icon.style						String	optional; "outlined"/null (default) or "filled"
  * @uiDefault Component.focusWidth						int
+ * @uiDefault Component.borderWidth						int
  * @uiDefault Component.focusColor						Color
- * @uiDefault CheckBox.icon.focusWidth					int		optional; defaults to Component.focusWidth
+ * @uiDefault CheckBox.icon.focusWidth					int or float	optional; defaults to Component.focusWidth
+ * @uiDefault CheckBox.icon.borderWidth					int or float	optional; defaults to Component.borderWidth
+ * @uiDefault CheckBox.icon.selectedBorderWidth			int or float	optional; defaults to CheckBox.icon.borderWidth
+ * @uiDefault CheckBox.icon.disabledSelectedBorderWidth	int or float	optional; defaults to CheckBox.icon.selectedBorderWidth
+ * @uiDefault CheckBox.arc								int
+ *
  * @uiDefault CheckBox.icon.focusColor					Color	optional; defaults to Component.focusColor
  * @uiDefault CheckBox.icon.borderColor					Color
  * @uiDefault CheckBox.icon.background					Color
  * @uiDefault CheckBox.icon.selectedBorderColor			Color
  * @uiDefault CheckBox.icon.selectedBackground			Color
  * @uiDefault CheckBox.icon.checkmarkColor				Color
+ *
  * @uiDefault CheckBox.icon.disabledBorderColor			Color
  * @uiDefault CheckBox.icon.disabledBackground			Color
+ * @uiDefault CheckBox.icon.disabledSelectedBorderColor	Color	optional; CheckBox.icon.disabledBorderColor is used if not specified
+ * @uiDefault CheckBox.icon.disabledSelectedBackground	Color	optional; CheckBox.icon.disabledBackground is used if not specified
  * @uiDefault CheckBox.icon.disabledCheckmarkColor		Color
+ *
  * @uiDefault CheckBox.icon.focusedBorderColor			Color	optional
  * @uiDefault CheckBox.icon.focusedBackground			Color	optional
- * @uiDefault CheckBox.icon.selectedFocusedBorderColor	Color	optional; CheckBox.icon.focusedBorderColor is used if not specified
- * @uiDefault CheckBox.icon.selectedFocusedBackground	Color	optional; CheckBox.icon.focusedBackground is used if not specified
- * @uiDefault CheckBox.icon.selectedFocusedCheckmarkColor	Color	optional; CheckBox.icon.checkmarkColor is used if not specified
+ * @uiDefault CheckBox.icon.focusedSelectedBorderColor	Color	optional; CheckBox.icon.focusedBorderColor is used if not specified
+ * @uiDefault CheckBox.icon.focusedSelectedBackground	Color	optional; CheckBox.icon.focusedBackground is used if not specified
+ * @uiDefault CheckBox.icon.focusedCheckmarkColor		Color	optional; CheckBox.icon.checkmarkColor is used if not specified
+ *
  * @uiDefault CheckBox.icon.hoverBorderColor			Color	optional
  * @uiDefault CheckBox.icon.hoverBackground				Color	optional
- * @uiDefault CheckBox.icon.selectedHoverBackground		Color	optional; CheckBox.icon.hoverBackground is used if not specified
+ * @uiDefault CheckBox.icon.hoverSelectedBorderColor	Color	optional; CheckBox.icon.hoverBorderColor is used if not specified
+ * @uiDefault CheckBox.icon.hoverSelectedBackground		Color	optional; CheckBox.icon.hoverBackground is used if not specified
+ * @uiDefault CheckBox.icon.hoverCheckmarkColor			Color	optional; CheckBox.icon.checkmarkColor is used if not specified
+ *
+ * @uiDefault CheckBox.icon.pressedBorderColor			Color	optional
  * @uiDefault CheckBox.icon.pressedBackground			Color	optional
- * @uiDefault CheckBox.icon.selectedPressedBackground	Color	optional; CheckBox.icon.pressedBackground is used if not specified
- * @uiDefault CheckBox.arc								int
+ * @uiDefault CheckBox.icon.pressedSelectedBorderColor	Color	optional; CheckBox.icon.pressedBorderColor is used if not specified
+ * @uiDefault CheckBox.icon.pressedSelectedBackground	Color	optional; CheckBox.icon.pressedBackground is used if not specified
+ * @uiDefault CheckBox.icon.pressedCheckmarkColor		Color	optional; CheckBox.icon.checkmarkColor is used if not specified
  *
  * @author Karl Tauber
  */
 public class FlatCheckBoxIcon
 	extends FlatAbstractIcon
 {
-	protected final String style = UIManager.getString( "CheckBox.icon.style" );
-	public final int focusWidth = getUIInt( "CheckBox.icon.focusWidth",
-		UIManager.getInt( "Component.focusWidth" ), style );
-	protected final Color focusColor = FlatUIUtils.getUIColor( "CheckBox.icon.focusColor",
-		UIManager.getColor( "Component.focusColor" ) );
-	protected final int arc = FlatUIUtils.getUIInt( "CheckBox.arc", 2 );
+	protected final String style = UIManager.getString( getPropertyPrefix() + "icon.style" );
+	@Styleable protected float focusWidth = getUIFloat( "CheckBox.icon.focusWidth", UIManager.getInt( "Component.focusWidth" ), style );
+	@Styleable protected Color focusColor = FlatUIUtils.getUIColor( "CheckBox.icon.focusColor", UIManager.getColor( "Component.focusColor" ) );
+	/** @since 2 */ @Styleable protected float borderWidth = getUIFloat( "CheckBox.icon.borderWidth", FlatUIUtils.getUIFloat( "Component.borderWidth", 1 ), style );
+	/** @since 2 */ @Styleable protected float selectedBorderWidth = getUIFloat( "CheckBox.icon.selectedBorderWidth", Float.MIN_VALUE, style );
+	/** @since 2 */ @Styleable protected float disabledSelectedBorderWidth = getUIFloat( "CheckBox.icon.disabledSelectedBorderWidth", Float.MIN_VALUE, style );
+	@Styleable protected int arc = FlatUIUtils.getUIInt( "CheckBox.arc", 2 );
 
 	// enabled
-	protected final Color borderColor = getUIColor( "CheckBox.icon.borderColor", style );
-	protected final Color background = getUIColor( "CheckBox.icon.background", style );
-	protected final Color selectedBorderColor = getUIColor( "CheckBox.icon.selectedBorderColor", style );
-	protected final Color selectedBackground = getUIColor( "CheckBox.icon.selectedBackground", style );
-	protected final Color checkmarkColor = getUIColor( "CheckBox.icon.checkmarkColor", style );
+	@Styleable protected Color borderColor = getUIColor( "CheckBox.icon.borderColor", style );
+	@Styleable protected Color background = getUIColor( "CheckBox.icon.background", style );
+	@Styleable protected Color selectedBorderColor = getUIColor( "CheckBox.icon.selectedBorderColor", style );
+	@Styleable protected Color selectedBackground = getUIColor( "CheckBox.icon.selectedBackground", style );
+	@Styleable protected Color checkmarkColor = getUIColor( "CheckBox.icon.checkmarkColor", style );
 
 	// disabled
-	protected final Color disabledBorderColor = getUIColor( "CheckBox.icon.disabledBorderColor", style );
-	protected final Color disabledBackground = getUIColor( "CheckBox.icon.disabledBackground", style );
-	protected final Color disabledCheckmarkColor = getUIColor( "CheckBox.icon.disabledCheckmarkColor", style );
+	@Styleable protected Color disabledBorderColor = getUIColor( "CheckBox.icon.disabledBorderColor", style );
+	@Styleable protected Color disabledBackground = getUIColor( "CheckBox.icon.disabledBackground", style );
+	/** @since 2 */ @Styleable protected Color disabledSelectedBorderColor = getUIColor( "CheckBox.icon.disabledSelectedBorderColor", style );
+	/** @since 2 */ @Styleable protected Color disabledSelectedBackground = getUIColor( "CheckBox.icon.disabledSelectedBackground", style );
+	@Styleable protected Color disabledCheckmarkColor = getUIColor( "CheckBox.icon.disabledCheckmarkColor", style );
 
 	// focused
-	protected final Color focusedBorderColor = getUIColor( "CheckBox.icon.focusedBorderColor", style );
-	protected final Color focusedBackground = getUIColor( "CheckBox.icon.focusedBackground", style );
-	protected final Color selectedFocusedBorderColor = getUIColor( "CheckBox.icon.selectedFocusedBorderColor", style );
-	protected final Color selectedFocusedBackground = getUIColor( "CheckBox.icon.selectedFocusedBackground", style );
-	protected final Color selectedFocusedCheckmarkColor = getUIColor( "CheckBox.icon.selectedFocusedCheckmarkColor", style );
+	@Styleable protected Color focusedBorderColor = getUIColor( "CheckBox.icon.focusedBorderColor", style );
+	@Styleable protected Color focusedBackground = getUIColor( "CheckBox.icon.focusedBackground", style );
+	/** @since 2 */ @Styleable protected Color focusedSelectedBorderColor = getUIColor( "CheckBox.icon.focusedSelectedBorderColor", style );
+	/** @since 2 */ @Styleable protected Color focusedSelectedBackground = getUIColor( "CheckBox.icon.focusedSelectedBackground", style );
+	/** @since 2 */ @Styleable protected Color focusedCheckmarkColor = getUIColor( "CheckBox.icon.focusedCheckmarkColor", style );
 
 	// hover
-	protected final Color hoverBorderColor = getUIColor( "CheckBox.icon.hoverBorderColor", style );
-	protected final Color hoverBackground = getUIColor( "CheckBox.icon.hoverBackground", style );
-	protected final Color selectedHoverBackground = getUIColor( "CheckBox.icon.selectedHoverBackground", style );
+	@Styleable protected Color hoverBorderColor = getUIColor( "CheckBox.icon.hoverBorderColor", style );
+	@Styleable protected Color hoverBackground = getUIColor( "CheckBox.icon.hoverBackground", style );
+	/** @since 2 */ @Styleable protected Color hoverSelectedBorderColor = getUIColor( "CheckBox.icon.hoverSelectedBorderColor", style );
+	/** @since 2 */ @Styleable protected Color hoverSelectedBackground = getUIColor( "CheckBox.icon.hoverSelectedBackground", style );
+	/** @since 2 */ @Styleable protected Color hoverCheckmarkColor = getUIColor( "CheckBox.icon.hoverCheckmarkColor", style );
 
 	// pressed
-	protected final Color pressedBackground = getUIColor( "CheckBox.icon.pressedBackground", style );
-	protected final Color selectedPressedBackground = getUIColor( "CheckBox.icon.selectedPressedBackground", style );
+	/** @since 2 */ @Styleable protected Color pressedBorderColor = getUIColor( "CheckBox.icon.pressedBorderColor", style );
+	@Styleable protected Color pressedBackground = getUIColor( "CheckBox.icon.pressedBackground", style );
+	/** @since 2 */ @Styleable protected Color pressedSelectedBorderColor = getUIColor( "CheckBox.icon.pressedSelectedBorderColor", style );
+	/** @since 2 */ @Styleable protected Color pressedSelectedBackground = getUIColor( "CheckBox.icon.pressedSelectedBackground", style );
+	/** @since 2 */ @Styleable protected Color pressedCheckmarkColor = getUIColor( "CheckBox.icon.pressedCheckmarkColor", style );
+
+	protected String getPropertyPrefix() {
+		return "CheckBox.";
+	}
 
 	protected static Color getUIColor( String key, String style ) {
 		if( style != null ) {
@@ -110,13 +142,14 @@ public class FlatCheckBoxIcon
 		return UIManager.getColor( key );
 	}
 
-	protected static int getUIInt( String key, int defaultValue, String style ) {
+	/** @since 2 */
+	protected static float getUIFloat( String key, float defaultValue, String style ) {
 		if( style != null ) {
-			Object value = UIManager.get( styleKey( key, style ) );
-			if( value instanceof Integer )
-				return (Integer) value;
+			float value = FlatUIUtils.getUIFloat( styleKey( key, style ), Float.MIN_VALUE );
+			if( value != Float.MIN_VALUE )
+				return value;
 		}
-		return FlatUIUtils.getUIInt( key, defaultValue );
+		return FlatUIUtils.getUIFloat( key, defaultValue );
 	}
 
 	private static String styleKey( String key, String style ) {
@@ -129,11 +162,31 @@ public class FlatCheckBoxIcon
 		super( ICON_SIZE, ICON_SIZE, null );
 	}
 
+	/** @since 2 */
+	public Object applyStyleProperty( String key, Object value ) {
+		return FlatStylingSupport.applyToAnnotatedObject( this, key, value );
+	}
+
+	/** @since 2 */
+	public Map<String, Class<?>> getStyleableInfos() {
+		return FlatStylingSupport.getAnnotatedStyleableInfos( this );
+	}
+
+	/** @since 2.5 */
+	public Object getStyleableValue( String key ) {
+		return FlatStylingSupport.getAnnotatedStyleableValue( this, key );
+	}
+
 	@Override
 	protected void paintIcon( Component c, Graphics2D g ) {
 		boolean indeterminate = isIndeterminate( c );
 		boolean selected = indeterminate || isSelected( c );
 		boolean isFocused = FlatUIUtils.isPermanentFocusOwner( c );
+		float bw = selected
+			? (disabledSelectedBorderWidth != Float.MIN_VALUE && !c.isEnabled()
+				? disabledSelectedBorderWidth
+				: (selectedBorderWidth != Float.MIN_VALUE ? selectedBorderWidth : borderWidth))
+			: borderWidth;
 
 		// paint focused border
 		if( isFocused && focusWidth > 0 && FlatButtonUI.isFocusPainted( c ) ) {
@@ -143,7 +196,7 @@ public class FlatCheckBoxIcon
 
 		// paint border
 		g.setColor( getBorderColor( c, selected ) );
-		paintBorder( c, g );
+		paintBorder( c, g, bw );
 
 		// paint background
 		Color bg = FlatUIUtils.deriveColor( getBackground( c, selected ),
@@ -151,14 +204,14 @@ public class FlatCheckBoxIcon
 		if( bg.getAlpha() < 255 ) {
 			// fill background with default color before filling with non-opaque background
 			g.setColor( selected ? selectedBackground : background );
-			paintBackground( c, g );
+			paintBackground( c, g, bw );
 		}
 		g.setColor( bg );
-		paintBackground( c, g );
+		paintBackground( c, g, bw );
 
 		// paint checkmark
-		if( selected || indeterminate ) {
-			g.setColor( getCheckmarkColor( c, selected, isFocused ) );
+		if( selected ) {
+			g.setColor( getCheckmarkColor( c ) );
 			if( indeterminate )
 				paintIndeterminate( c, g );
 			else
@@ -167,20 +220,25 @@ public class FlatCheckBoxIcon
 	}
 
 	protected void paintFocusBorder( Component c, Graphics2D g ) {
-		// the outline focus border is painted outside of the icon
-		int wh = ICON_SIZE - 1 + (focusWidth * 2);
-		int arcwh = arc + (focusWidth * 2);
-		g.fillRoundRect( -focusWidth + 1, -focusWidth, wh, wh, arcwh, arcwh );
+		// the outer focus border is painted outside of the icon
+		float wh = ICON_SIZE - 1 + (focusWidth * 2);
+		float arcwh = arc + (focusWidth * 2);
+		g.fill( new RoundRectangle2D.Float( -focusWidth + 1, -focusWidth, wh, wh, arcwh, arcwh ) );
 	}
 
-	protected void paintBorder( Component c, Graphics2D g ) {
+	protected void paintBorder( Component c, Graphics2D g, float borderWidth ) {
+		if( borderWidth == 0 )
+			return;
+
 		int arcwh = arc;
 		g.fillRoundRect( 1, 0, 14, 14, arcwh, arcwh );
 	}
 
-	protected void paintBackground( Component c, Graphics2D g ) {
-		int arcwh = arc - 1;
-		g.fillRoundRect( 2, 1, 12, 12, arcwh, arcwh );
+	protected void paintBackground( Component c, Graphics2D g, float borderWidth ) {
+		float xy = borderWidth;
+		float wh = 14 - (borderWidth * 2);
+		float arcwh = arc - borderWidth;
+		g.fill( new RoundRectangle2D.Float( 1 + xy, xy, wh, wh, arcwh, arcwh ) );
 	}
 
 	protected void paintCheckmark( Component c, Graphics2D g ) {
@@ -205,6 +263,11 @@ public class FlatCheckBoxIcon
 		return c instanceof AbstractButton && ((AbstractButton)c).isSelected();
 	}
 
+	/** @since 2 */
+	public float getFocusWidth() {
+		return focusWidth;
+	}
+
 	protected Color getFocusColor( Component c ) {
 		return focusColor;
 	}
@@ -212,26 +275,27 @@ public class FlatCheckBoxIcon
 	protected Color getBorderColor( Component c, boolean selected ) {
 		return FlatButtonUI.buttonStateColor( c,
 			selected ? selectedBorderColor : borderColor,
-			disabledBorderColor,
-			selected && selectedFocusedBorderColor != null ? selectedFocusedBorderColor : focusedBorderColor,
-			hoverBorderColor,
-			null );
+			(selected && disabledSelectedBorderColor != null) ? disabledSelectedBorderColor : disabledBorderColor,
+			(selected && focusedSelectedBorderColor != null) ? focusedSelectedBorderColor : focusedBorderColor,
+			(selected && hoverSelectedBorderColor != null) ? hoverSelectedBorderColor : hoverBorderColor,
+			(selected && pressedSelectedBorderColor != null) ? pressedSelectedBorderColor : pressedBorderColor );
 	}
 
 	protected Color getBackground( Component c, boolean selected ) {
 		return FlatButtonUI.buttonStateColor( c,
 			selected ? selectedBackground : background,
-			disabledBackground,
-			(selected && selectedFocusedBackground != null) ? selectedFocusedBackground : focusedBackground,
-			(selected && selectedHoverBackground != null) ? selectedHoverBackground : hoverBackground,
-			(selected && selectedPressedBackground != null) ? selectedPressedBackground : pressedBackground );
+			(selected && disabledSelectedBackground != null) ? disabledSelectedBackground : disabledBackground,
+			(selected && focusedSelectedBackground != null) ? focusedSelectedBackground : focusedBackground,
+			(selected && hoverSelectedBackground != null) ? hoverSelectedBackground : hoverBackground,
+			(selected && pressedSelectedBackground != null) ? pressedSelectedBackground : pressedBackground );
 	}
 
-	protected Color getCheckmarkColor( Component c, boolean selected, boolean isFocused ) {
-		return c.isEnabled()
-			? ((selected && isFocused && selectedFocusedCheckmarkColor != null)
-				? selectedFocusedCheckmarkColor
-				: checkmarkColor)
-			: disabledCheckmarkColor;
+	protected Color getCheckmarkColor( Component c ) {
+		return FlatButtonUI.buttonStateColor( c,
+			checkmarkColor,
+			disabledCheckmarkColor,
+			focusedCheckmarkColor,
+			hoverCheckmarkColor,
+			pressedCheckmarkColor );
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatCheckBoxMenuItemIcon.java

@@ -21,15 +21,18 @@ import java.awt.Color;
 import java.awt.Component;
 import java.awt.Graphics2D;
 import java.awt.geom.Path2D;
+import java.util.Map;
 import javax.swing.AbstractButton;
 import javax.swing.JMenuItem;
 import javax.swing.UIManager;
+import com.formdev.flatlaf.ui.FlatStylingSupport;
+import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
 
 /**
  * Icon for {@link javax.swing.JCheckBoxMenuItem}.
  *
- * @uiDefault MenuItemCheckBox.icon.checkmarkColor				Color
- * @uiDefault MenuItemCheckBox.icon.disabledCheckmarkColor		Color
+ * @uiDefault CheckBoxMenuItem.icon.checkmarkColor				Color
+ * @uiDefault CheckBoxMenuItem.icon.disabledCheckmarkColor		Color
  * @uiDefault MenuItem.selectionForeground						Color
  * @uiDefault MenuItem.selectionType							String
  *
@@ -38,14 +41,29 @@ import javax.swing.UIManager;
 public class FlatCheckBoxMenuItemIcon
 	extends FlatAbstractIcon
 {
-	protected final Color checkmarkColor = UIManager.getColor( "MenuItemCheckBox.icon.checkmarkColor" );
-	protected final Color disabledCheckmarkColor = UIManager.getColor( "MenuItemCheckBox.icon.disabledCheckmarkColor" );
-	protected final Color selectionForeground = UIManager.getColor( "MenuItem.selectionForeground" );
+	@Styleable protected Color checkmarkColor = UIManager.getColor( "CheckBoxMenuItem.icon.checkmarkColor" );
+	@Styleable protected Color disabledCheckmarkColor = UIManager.getColor( "CheckBoxMenuItem.icon.disabledCheckmarkColor" );
+	@Styleable protected Color selectionForeground = UIManager.getColor( "MenuItem.selectionForeground" );
 
 	public FlatCheckBoxMenuItemIcon() {
 		super( 15, 15, null );
 	}
 
+	/** @since 2 */
+	public Object applyStyleProperty( String key, Object value ) {
+		return FlatStylingSupport.applyToAnnotatedObject( this, key, value );
+	}
+
+	/** @since 2 */
+	public Map<String, Class<?>> getStyleableInfos() {
+		return FlatStylingSupport.getAnnotatedStyleableInfos( this );
+	}
+
+	/** @since 2.5 */
+	public Object getStyleableValue( String key ) {
+		return FlatStylingSupport.getAnnotatedStyleableValue( this, key );
+	}
+
 	@Override
 	protected void paintIcon( Component c, Graphics2D g2 ) {
 		boolean selected = (c instanceof AbstractButton) && ((AbstractButton)c).isSelected();

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatClearIcon.java

@@ -0,0 +1,111 @@
+/*
+ * Copyright 2021 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.icons;
+
+import java.awt.Color;
+import java.awt.Component;
+import java.awt.Graphics2D;
+import java.awt.geom.Ellipse2D;
+import java.awt.geom.Line2D;
+import java.awt.geom.Path2D;
+import java.util.Map;
+import javax.swing.AbstractButton;
+import javax.swing.ButtonModel;
+import javax.swing.UIManager;
+import com.formdev.flatlaf.ui.FlatStylingSupport;
+import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
+import com.formdev.flatlaf.ui.FlatUIUtils;
+
+/**
+ * "clear" icon for search fields.
+ *
+ * @uiDefault SearchField.clearIconColor				Color
+ * @uiDefault SearchField.clearIconHoverColor			Color
+ * @uiDefault SearchField.clearIconPressedColor			Color
+ *
+ * @author Karl Tauber
+ * @since 1.5
+ */
+public class FlatClearIcon
+	extends FlatAbstractIcon
+{
+	@Styleable protected Color clearIconColor = UIManager.getColor( "SearchField.clearIconColor" );
+	@Styleable protected Color clearIconHoverColor = UIManager.getColor( "SearchField.clearIconHoverColor" );
+	@Styleable protected Color clearIconPressedColor = UIManager.getColor( "SearchField.clearIconPressedColor" );
+
+	private final boolean ignoreButtonState;
+
+	public FlatClearIcon() {
+		this( false );
+	}
+
+	/** @since 2 */
+	public FlatClearIcon( boolean ignoreButtonState ) {
+		super( 16, 16, null );
+		this.ignoreButtonState = ignoreButtonState;
+	}
+
+	/** @since 2 */
+	public Object applyStyleProperty( String key, Object value ) {
+		return FlatStylingSupport.applyToAnnotatedObject( this, key, value );
+	}
+
+	/** @since 2 */
+	public Map<String, Class<?>> getStyleableInfos() {
+		return FlatStylingSupport.getAnnotatedStyleableInfos( this );
+	}
+
+	/** @since 2.5 */
+	public Object getStyleableValue( String key ) {
+		return FlatStylingSupport.getAnnotatedStyleableValue( this, key );
+	}
+
+	@Override
+	protected void paintIcon( Component c, Graphics2D g ) {
+		if( !ignoreButtonState && c instanceof AbstractButton ) {
+			ButtonModel model = ((AbstractButton)c).getModel();
+			if( model.isPressed() || model.isRollover() ) {
+				/*
+					<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16">
+					  <path fill="#7F8B91" fill-opacity=".5" fill-rule="evenodd" d="M8,1.75 C11.4517797,1.75 14.25,4.54822031 14.25,8 C14.25,11.4517797 11.4517797,14.25 8,14.25 C4.54822031,14.25 1.75,11.4517797 1.75,8 C1.75,4.54822031 4.54822031,1.75 8,1.75 Z M10.5,4.5 L8,7 L5.5,4.5 L4.5,5.5 L7,8 L4.5,10.5 L5.5,11.5 L8,9 L10.5,11.5 L11.5,10.5 L9,8 L11.5,5.5 L10.5,4.5 Z"/>
+					</svg>
+				*/
+
+				// paint filled circle with cross
+				g.setColor( model.isPressed() ? clearIconPressedColor : clearIconHoverColor );
+				Path2D path = new Path2D.Float( Path2D.WIND_EVEN_ODD );
+				path.append( new Ellipse2D.Float( 1.75f, 1.75f, 12.5f, 12.5f ), false );
+				path.append( FlatUIUtils.createPath( 4.5,5.5, 5.5,4.5, 8,7,  10.5,4.5, 11.5,5.5, 9,8,  11.5,10.5, 10.5,11.5, 8,9,  5.5,11.5, 4.5,10.5, 7,8 ), false );
+				g.fill( path );
+				return;
+			}
+		}
+
+		/*
+			<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16">
+			  <path fill="none" stroke="#7F8B91" stroke-linecap="square" stroke-opacity=".5" d="M5,5 L11,11 M5,11 L11,5"/>
+			</svg>
+		*/
+
+		// paint cross
+		g.setColor( clearIconColor );
+		Path2D path = new Path2D.Float( Path2D.WIND_EVEN_ODD );
+		path.append( new Line2D.Float( 5,5, 11,11 ), false );
+		path.append( new Line2D.Float( 5,11, 11,5 ), false );
+		g.draw( path );
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatDescendingSortIcon.java

@@ -17,11 +17,9 @@
 package com.formdev.flatlaf.icons;
 
 import java.awt.BasicStroke;
-import java.awt.Color;
 import java.awt.Component;
 import java.awt.Graphics2D;
 import java.awt.geom.Path2D;
-import javax.swing.UIManager;
 import com.formdev.flatlaf.ui.FlatUIUtils;
 
 /**
@@ -33,18 +31,14 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
  * @author Karl Tauber
  */
 public class FlatDescendingSortIcon
-	extends FlatAbstractIcon
+	extends FlatAscendingSortIcon
 {
-	protected final boolean chevron = FlatUIUtils.isChevron( UIManager.getString( "Component.arrowType" ) );
-	protected final Color sortIconColor = UIManager.getColor( "Table.sortIconColor" );
-
 	public FlatDescendingSortIcon() {
-		super( 10, 5, null );
+		super();
 	}
 
 	@Override
-	protected void paintIcon( Component c, Graphics2D g ) {
-		g.setColor( sortIconColor );
+	protected void paintArrow( Component c, Graphics2D g, boolean chevron ) {
 		if( chevron ) {
 			// chevron arrow
 			Path2D path = FlatUIUtils.createPath( false, 1,0, 5,4, 9,0 );

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatHelpButtonIcon.java

@@ -22,8 +22,11 @@ import java.awt.Component;
 import java.awt.Graphics2D;
 import java.awt.geom.Ellipse2D;
 import java.awt.geom.Path2D;
+import java.util.Map;
 import javax.swing.UIManager;
 import com.formdev.flatlaf.ui.FlatButtonUI;
+import com.formdev.flatlaf.ui.FlatStylingSupport;
+import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
 import com.formdev.flatlaf.ui.FlatUIUtils;
 
 /**
@@ -50,29 +53,42 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
 public class FlatHelpButtonIcon
 	extends FlatAbstractIcon
 {
-	protected final int focusWidth = UIManager.getInt( "Component.focusWidth" );
-	protected final Color focusColor = UIManager.getColor( "Component.focusColor" );
-	protected final float innerFocusWidth = FlatUIUtils.getUIFloat( "HelpButton.innerFocusWidth", FlatUIUtils.getUIFloat( "Component.innerFocusWidth", 0 ) );
-	protected final int borderWidth = FlatUIUtils.getUIInt( "HelpButton.borderWidth", 1 );
+	@Styleable protected int focusWidth = UIManager.getInt( "Component.focusWidth" );
+	@Styleable protected Color focusColor = UIManager.getColor( "Component.focusColor" );
+	@Styleable protected float innerFocusWidth = FlatUIUtils.getUIFloat( "HelpButton.innerFocusWidth", FlatUIUtils.getUIFloat( "Component.innerFocusWidth", 0 ) );
+	@Styleable protected int borderWidth = FlatUIUtils.getUIInt( "HelpButton.borderWidth", 1 );
 
-	protected final Color borderColor = UIManager.getColor( "HelpButton.borderColor" );
-	protected final Color disabledBorderColor = UIManager.getColor( "HelpButton.disabledBorderColor" );
-	protected final Color focusedBorderColor = UIManager.getColor( "HelpButton.focusedBorderColor" );
-	protected final Color hoverBorderColor = UIManager.getColor( "HelpButton.hoverBorderColor" );
-	protected final Color background = UIManager.getColor( "HelpButton.background" );
-	protected final Color disabledBackground = UIManager.getColor( "HelpButton.disabledBackground" );
-	protected final Color focusedBackground = UIManager.getColor( "HelpButton.focusedBackground" );
-	protected final Color hoverBackground = UIManager.getColor( "HelpButton.hoverBackground" );
-	protected final Color pressedBackground = UIManager.getColor( "HelpButton.pressedBackground" );
-	protected final Color questionMarkColor = UIManager.getColor( "HelpButton.questionMarkColor" );
-	protected final Color disabledQuestionMarkColor = UIManager.getColor( "HelpButton.disabledQuestionMarkColor" );
-
-	protected final int iconSize = 22 + (focusWidth * 2);
+	@Styleable protected Color borderColor = UIManager.getColor( "HelpButton.borderColor" );
+	@Styleable protected Color disabledBorderColor = UIManager.getColor( "HelpButton.disabledBorderColor" );
+	@Styleable protected Color focusedBorderColor = UIManager.getColor( "HelpButton.focusedBorderColor" );
+	@Styleable protected Color hoverBorderColor = UIManager.getColor( "HelpButton.hoverBorderColor" );
+	@Styleable protected Color background = UIManager.getColor( "HelpButton.background" );
+	@Styleable protected Color disabledBackground = UIManager.getColor( "HelpButton.disabledBackground" );
+	@Styleable protected Color focusedBackground = UIManager.getColor( "HelpButton.focusedBackground" );
+	@Styleable protected Color hoverBackground = UIManager.getColor( "HelpButton.hoverBackground" );
+	@Styleable protected Color pressedBackground = UIManager.getColor( "HelpButton.pressedBackground" );
+	@Styleable protected Color questionMarkColor = UIManager.getColor( "HelpButton.questionMarkColor" );
+	@Styleable protected Color disabledQuestionMarkColor = UIManager.getColor( "HelpButton.disabledQuestionMarkColor" );
 
 	public FlatHelpButtonIcon() {
 		super( 0, 0, null );
 	}
 
+	/** @since 2 */
+	public Object applyStyleProperty( String key, Object value ) {
+		return FlatStylingSupport.applyToAnnotatedObject( this, key, value );
+	}
+
+	/** @since 2 */
+	public Map<String, Class<?>> getStyleableInfos() {
+		return FlatStylingSupport.getAnnotatedStyleableInfos( this );
+	}
+
+	/** @since 2.5 */
+	public Object getStyleableValue( String key ) {
+		return FlatStylingSupport.getAnnotatedStyleableValue( this, key );
+	}
+
 	@Override
 	protected void paintIcon( Component c, Graphics2D g2 ) {
 		/*
@@ -85,11 +101,11 @@ public class FlatHelpButtonIcon
 			</svg>
 		*/
 
-		boolean enabled = c.isEnabled();
-		boolean focused = FlatUIUtils.isPermanentFocusOwner( c );
+		boolean enabled = c == null || c.isEnabled();
+		boolean focused = c != null && FlatUIUtils.isPermanentFocusOwner( c );
 
 		float xy = 0.5f;
-		float wh = iconSize - 1;
+		float wh = iconSize() - 1;
 
 		// paint outer focus border
 		if( focused && FlatButtonUI.isFocusPainted( c ) ) {
@@ -151,11 +167,15 @@ public class FlatHelpButtonIcon
 
 	@Override
 	public int getIconWidth() {
-		return scale( iconSize );
+		return scale( iconSize() );
 	}
 
 	@Override
 	public int getIconHeight() {
-		return scale( iconSize );
+		return scale( iconSize() );
+	}
+
+	private int iconSize() {
+		return 22 + (focusWidth * 2);
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatMenuArrowIcon.java

@@ -21,9 +21,12 @@ import java.awt.Color;
 import java.awt.Component;
 import java.awt.Graphics2D;
 import java.awt.geom.Path2D;
+import java.util.Map;
 import javax.swing.JMenu;
 import javax.swing.UIManager;
+import com.formdev.flatlaf.ui.FlatStylingSupport;
 import com.formdev.flatlaf.ui.FlatUIUtils;
+import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
 
 /**
  * "arrow" icon for {@link javax.swing.JMenu}.
@@ -39,22 +42,37 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
 public class FlatMenuArrowIcon
 	extends FlatAbstractIcon
 {
-	protected final boolean chevron = FlatUIUtils.isChevron( UIManager.getString( "Component.arrowType" ) );
-	protected final Color arrowColor = UIManager.getColor( "Menu.icon.arrowColor" );
-	protected final Color disabledArrowColor = UIManager.getColor( "Menu.icon.disabledArrowColor" );
-	protected final Color selectionForeground = UIManager.getColor( "Menu.selectionForeground" );
+	@Styleable protected String arrowType = UIManager.getString( "Component.arrowType" );
+	@Styleable protected Color arrowColor = UIManager.getColor( "Menu.icon.arrowColor" );
+	@Styleable protected Color disabledArrowColor = UIManager.getColor( "Menu.icon.disabledArrowColor" );
+	@Styleable protected Color selectionForeground = UIManager.getColor( "Menu.selectionForeground" );
 
 	public FlatMenuArrowIcon() {
 		super( 6, 10, null );
 	}
 
+	/** @since 2 */
+	public Object applyStyleProperty( String key, Object value ) {
+		return FlatStylingSupport.applyToAnnotatedObject( this, key, value );
+	}
+
+	/** @since 2 */
+	public Map<String, Class<?>> getStyleableInfos() {
+		return FlatStylingSupport.getAnnotatedStyleableInfos( this );
+	}
+
+	/** @since 2.5 */
+	public Object getStyleableValue( String key ) {
+		return FlatStylingSupport.getAnnotatedStyleableValue( this, key );
+	}
+
 	@Override
 	protected void paintIcon( Component c, Graphics2D g ) {
-		if( !c.getComponentOrientation().isLeftToRight() )
+		if( c != null && !c.getComponentOrientation().isLeftToRight() )
 			g.rotate( Math.toRadians( 180 ), width / 2., height / 2. );
 
 		g.setColor( getArrowColor( c ) );
-		if( chevron ) {
+		if( FlatUIUtils.isChevron( arrowType ) ) {
 			// chevron arrow
 			Path2D path = FlatUIUtils.createPath( false, 1,1, 5,5, 1,9 );
 			g.setStroke( new BasicStroke( 1f ) );
@@ -69,7 +87,7 @@ public class FlatMenuArrowIcon
 		if( c instanceof JMenu && ((JMenu)c).isSelected() && !isUnderlineSelection() )
 			return selectionForeground;
 
-		return c.isEnabled() ? arrowColor : disabledArrowColor;
+		return c == null || c.isEnabled() ? arrowColor : disabledArrowColor;
 	}
 
 	protected boolean isUnderlineSelection() {

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatMenuItemArrowIcon.java

@@ -21,14 +21,16 @@ import java.awt.Graphics;
 import java.awt.Graphics2D;
 
 /**
- * "arrow" icon for {@link javax.swing.JMenuItem}.
+ * "arrow" icon for {@link javax.swing.JMenuItem}, {@link javax.swing.JCheckBoxMenuItem}
+ * and {@link javax.swing.JRadioButtonMenuItem}.
  *
  * @author Karl Tauber
  */
 public class FlatMenuItemArrowIcon
-	extends FlatMenuArrowIcon
+	extends FlatAbstractIcon
 {
 	public FlatMenuItemArrowIcon() {
+		super( 6, 10, null );
 	}
 
 	@Override

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatRadioButtonIcon.java

@@ -19,38 +19,51 @@ package com.formdev.flatlaf.icons;
 import java.awt.Component;
 import java.awt.Graphics2D;
 import java.awt.geom.Ellipse2D;
+import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
 
 /**
  * Icon for {@link javax.swing.JRadioButton}.
- *
- * Note: If Component.focusWidth is greater than zero, then the outline focus border
+ * <p>
+ * <strong>Note</strong>:
+ *       If Component.focusWidth is greater than zero, then the outer focus border
  *       is painted outside of the icon bounds. Make sure that the radiobutton
  *       has margins, which are equal or greater than focusWidth.
  *
- * @uiDefault RadioButton.icon.centerDiameter			int
+ * @uiDefault RadioButton.icon.style					String	optional; "outlined"/null (default) or "filled"
+ * @uiDefault RadioButton.icon.centerDiameter			int or float
  *
  * @author Karl Tauber
  */
 public class FlatRadioButtonIcon
 	extends FlatCheckBoxIcon
 {
-	protected final int centerDiameter = getUIInt( "RadioButton.icon.centerDiameter", 8, style );
+	@Styleable protected float centerDiameter = getUIFloat( "RadioButton.icon.centerDiameter", 8, style );
 
 	@Override
-	protected void paintFocusBorder( Component c, Graphics2D g ) {
-		// the outline focus border is painted outside of the icon
-		int wh = ICON_SIZE + (focusWidth * 2);
-		g.fillOval( -focusWidth, -focusWidth, wh, wh );
+	protected String getPropertyPrefix() {
+		return "RadioButton.";
 	}
 
 	@Override
-	protected void paintBorder( Component c, Graphics2D g ) {
+	protected void paintFocusBorder( Component c, Graphics2D g ) {
+		// the outer focus border is painted outside of the icon
+		float wh = ICON_SIZE + (focusWidth * 2);
+		g.fill( new Ellipse2D.Float( -focusWidth, -focusWidth, wh, wh ) );
+	}
+
+	@Override
+	protected void paintBorder( Component c, Graphics2D g, float borderWidth ) {
+		if( borderWidth == 0 )
+			return;
+
 		g.fillOval( 0, 0, 15, 15 );
 	}
 
 	@Override
-	protected void paintBackground( Component c, Graphics2D g ) {
-		g.fillOval( 1, 1, 13, 13 );
+	protected void paintBackground( Component c, Graphics2D g, float borderWidth ) {
+		float xy = borderWidth;
+		float wh = 15 - (borderWidth * 2);
+		g.fill( new Ellipse2D.Float( xy, xy, wh, wh ) );
 	}
 
 	@Override

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatRevealIcon.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2021 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.icons;
+
+import java.awt.Component;
+import java.awt.Graphics2D;
+import java.awt.geom.Area;
+import java.awt.geom.Ellipse2D;
+import java.awt.geom.Path2D;
+import java.awt.geom.Rectangle2D;
+import javax.swing.UIManager;
+
+/**
+ * "eye" icon for {@link javax.swing.JPasswordField}.
+ *
+ * @uiDefault PasswordField.revealIconColor				Color
+ *
+ * @author Karl Tauber
+ * @since 2
+ */
+public class FlatRevealIcon
+	extends FlatAbstractIcon
+{
+	public FlatRevealIcon() {
+		super( 16, 16, UIManager.getColor( "PasswordField.revealIconColor" ) );
+	}
+
+	@Override
+	protected void paintIcon( Component c, Graphics2D g ) {
+		Path2D path = new Path2D.Float( Path2D.WIND_EVEN_ODD );
+		path.append( new Ellipse2D.Float( 5.15f, 6.15f, 5.7f, 5.7f ), false );
+		path.append( new Ellipse2D.Float( 6, 7, 4, 4 ), false );
+		g.fill( path );
+
+		Path2D path2 = new Path2D.Float( Path2D.WIND_EVEN_ODD );
+		path2.append( new Ellipse2D.Float( 2.15f, 4.15f, 11.7f, 11.7f ), false );
+		path2.append( new Ellipse2D.Float( 3, 5, 10, 10 ), false );
+		Area area = new Area( path2 );
+		area.subtract( new Area( new Rectangle2D.Float( 0, 9.5f, 16, 16 ) ) );
+		g.fill( area );
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatSearchIcon.java

@@ -0,0 +1,97 @@
+/*
+ * Copyright 2021 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.icons;
+
+import java.awt.Color;
+import java.awt.Component;
+import java.awt.Graphics2D;
+import java.awt.geom.Area;
+import java.awt.geom.Ellipse2D;
+import java.util.Map;
+import javax.swing.UIManager;
+import com.formdev.flatlaf.ui.FlatButtonUI;
+import com.formdev.flatlaf.ui.FlatStylingSupport;
+import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
+import com.formdev.flatlaf.ui.FlatUIUtils;
+
+/**
+ * "search" icon for search fields.
+ *
+ * @uiDefault SearchField.searchIconColor				Color
+ * @uiDefault SearchField.searchIconHoverColor			Color
+ * @uiDefault SearchField.searchIconPressedColor		Color
+ *
+ * @author Karl Tauber
+ * @since 1.5
+ */
+public class FlatSearchIcon
+	extends FlatAbstractIcon
+{
+	@Styleable protected Color searchIconColor = UIManager.getColor( "SearchField.searchIconColor" );
+	@Styleable protected Color searchIconHoverColor = UIManager.getColor( "SearchField.searchIconHoverColor" );
+	@Styleable protected Color searchIconPressedColor = UIManager.getColor( "SearchField.searchIconPressedColor" );
+
+	private final boolean ignoreButtonState;
+
+	public FlatSearchIcon() {
+		this( false );
+	}
+
+	/** @since 2 */
+	public FlatSearchIcon( boolean ignoreButtonState ) {
+		super( 16, 16, null );
+		this.ignoreButtonState = ignoreButtonState;
+	}
+
+	/** @since 2 */
+	public Object applyStyleProperty( String key, Object value ) {
+		return FlatStylingSupport.applyToAnnotatedObject( this, key, value );
+	}
+
+	/** @since 2 */
+	public Map<String, Class<?>> getStyleableInfos() {
+		return FlatStylingSupport.getAnnotatedStyleableInfos( this );
+	}
+
+	/** @since 2.5 */
+	public Object getStyleableValue( String key ) {
+		return FlatStylingSupport.getAnnotatedStyleableValue( this, key );
+	}
+
+	@Override
+	protected void paintIcon( Component c, Graphics2D g ) {
+		/*
+			<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16">
+			  <g fill="none" fill-opacity=".9" fill-rule="evenodd">
+			    <polygon fill="#7F8B91" points="10.813 9.75 14 12.938 12.938 14 9.75 10.813"/>
+			    <path fill="#7F8B91" d="M7,2 C9.76142375,2 12,4.23857625 12,7 C12,9.76142375 9.76142375,12 7,12 C4.23857625,12 2,9.76142375 2,7 C2,4.23857625 4.23857625,2 7,2 Z M7,3 C4.790861,3 3,4.790861 3,7 C3,9.209139 4.790861,11 7,11 C9.209139,11 11,9.209139 11,7 C11,4.790861 9.209139,3 7,3 Z"/>
+			  </g>
+			</svg>
+		*/
+
+		g.setColor( ignoreButtonState
+			? searchIconColor
+			: FlatButtonUI.buttonStateColor( c, searchIconColor, searchIconColor,
+				null, searchIconHoverColor, searchIconPressedColor ) );
+
+		// paint magnifier
+		Area area = new Area( new Ellipse2D.Float( 2, 2, 10, 10 ) );
+		area.subtract( new Area( new Ellipse2D.Float( 3, 3, 8, 8 ) ) );
+		area.add( new Area( FlatUIUtils.createPath( 10.813,9.75, 14,12.938, 12.938,14, 9.75,10.813 ) ) );
+		g.fill( area );
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatSearchWithHistoryIcon.java

@@ -0,0 +1,61 @@
+/*
+ * Copyright 2021 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.icons;
+
+import java.awt.Component;
+import java.awt.Graphics2D;
+import com.formdev.flatlaf.ui.FlatUIUtils;
+
+/**
+ * "search with history" icon for search fields.
+ *
+ * @author Karl Tauber
+ * @since 1.5
+ */
+public class FlatSearchWithHistoryIcon
+	extends FlatSearchIcon
+{
+	public FlatSearchWithHistoryIcon() {
+		this( false );
+	}
+
+	/** @since 2 */
+	public FlatSearchWithHistoryIcon( boolean ignoreButtonState ) {
+		super( ignoreButtonState );
+	}
+
+	@Override
+	protected void paintIcon( Component c, Graphics2D g ) {
+		/*
+			<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16">
+			  <g fill="none" fill-opacity=".9" fill-rule="evenodd">
+			    <polygon fill="#7F8B91" points="8.813 9.75 12 12.938 10.938 14 7.75 10.813"/>
+			    <path fill="#7F8B91" d="M5,2 C7.76142375,2 10,4.23857625 10,7 C10,9.76142375 7.76142375,12 5,12 C2.23857625,12 0,9.76142375 0,7 C0,4.23857625 2.23857625,2 5,2 Z M5,3 C2.790861,3 1,4.790861 1,7 C1,9.209139 2.790861,11 5,11 C7.209139,11 9,9.209139 9,7 C9,4.790861 7.209139,3 5,3 Z"/>
+			    <polygon fill="#7F8B91" points="11 7 16 7 13.5 10"/>
+			  </g>
+			</svg>
+		*/
+
+		// paint magnifier
+		g.translate( -2, 0 );
+		super.paintIcon( c, g );
+		g.translate( 2, 0 );
+
+		// paint history arrow
+		g.fill( FlatUIUtils.createPath( 11,7, 16,7, 13.5,10 ) );
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatTabbedPaneCloseIcon.java

@@ -23,8 +23,11 @@ import java.awt.Dimension;
 import java.awt.Graphics2D;
 import java.awt.geom.Line2D;
 import java.awt.geom.Path2D;
+import java.util.Map;
 import javax.swing.UIManager;
 import com.formdev.flatlaf.ui.FlatButtonUI;
+import com.formdev.flatlaf.ui.FlatStylingSupport;
+import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
 import com.formdev.flatlaf.ui.FlatUIUtils;
 
 /**
@@ -47,39 +50,54 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
 public class FlatTabbedPaneCloseIcon
 	extends FlatAbstractIcon
 {
-	protected final Dimension size = UIManager.getDimension( "TabbedPane.closeSize" );
-	protected final int arc = UIManager.getInt( "TabbedPane.closeArc" );
-	protected final float crossPlainSize = FlatUIUtils.getUIFloat( "TabbedPane.closeCrossPlainSize", 7.5f );
-	protected final float crossFilledSize = FlatUIUtils.getUIFloat( "TabbedPane.closeCrossFilledSize", crossPlainSize );
-	protected final float closeCrossLineWidth = FlatUIUtils.getUIFloat( "TabbedPane.closeCrossLineWidth", 1f );
-	protected final Color background = UIManager.getColor( "TabbedPane.closeBackground" );
-	protected final Color foreground = UIManager.getColor( "TabbedPane.closeForeground" );
-	protected final Color hoverBackground = UIManager.getColor( "TabbedPane.closeHoverBackground" );
-	protected final Color hoverForeground = UIManager.getColor( "TabbedPane.closeHoverForeground" );
-	protected final Color pressedBackground = UIManager.getColor( "TabbedPane.closePressedBackground" );
-	protected final Color pressedForeground = UIManager.getColor( "TabbedPane.closePressedForeground" );
+	@Styleable protected Dimension closeSize = UIManager.getDimension( "TabbedPane.closeSize" );
+	@Styleable protected int closeArc = UIManager.getInt( "TabbedPane.closeArc" );
+	@Styleable protected float closeCrossPlainSize = FlatUIUtils.getUIFloat( "TabbedPane.closeCrossPlainSize", 7.5f );
+	@Styleable protected float closeCrossFilledSize = FlatUIUtils.getUIFloat( "TabbedPane.closeCrossFilledSize", closeCrossPlainSize );
+	@Styleable protected float closeCrossLineWidth = FlatUIUtils.getUIFloat( "TabbedPane.closeCrossLineWidth", 1f );
+	@Styleable protected Color closeBackground = UIManager.getColor( "TabbedPane.closeBackground" );
+	@Styleable protected Color closeForeground = UIManager.getColor( "TabbedPane.closeForeground" );
+	@Styleable protected Color closeHoverBackground = UIManager.getColor( "TabbedPane.closeHoverBackground" );
+	@Styleable protected Color closeHoverForeground = UIManager.getColor( "TabbedPane.closeHoverForeground" );
+	@Styleable protected Color closePressedBackground = UIManager.getColor( "TabbedPane.closePressedBackground" );
+	@Styleable protected Color closePressedForeground = UIManager.getColor( "TabbedPane.closePressedForeground" );
 
 	public FlatTabbedPaneCloseIcon() {
 		super( 16, 16, null );
 	}
 
+	/** @since 2 */
+	public Object applyStyleProperty( String key, Object value ) {
+		return FlatStylingSupport.applyToAnnotatedObject( this, key, value );
+	}
+
+	/** @since 2 */
+	public Map<String, Class<?>> getStyleableInfos() {
+		return FlatStylingSupport.getAnnotatedStyleableInfos( this );
+	}
+
+	/** @since 2.5 */
+	public Object getStyleableValue( String key ) {
+		return FlatStylingSupport.getAnnotatedStyleableValue( this, key );
+	}
+
 	@Override
 	protected void paintIcon( Component c, Graphics2D g ) {
 		// paint background
-		Color bg = FlatButtonUI.buttonStateColor( c, background, null, null, hoverBackground, pressedBackground );
+		Color bg = FlatButtonUI.buttonStateColor( c, closeBackground, null, null, closeHoverBackground, closePressedBackground );
 		if( bg != null ) {
 			g.setColor( FlatUIUtils.deriveColor( bg, c.getBackground() ) );
-			g.fillRoundRect( (width - size.width) / 2, (height - size.height) / 2,
-				size.width, size.height, arc, arc );
+			g.fillRoundRect( (width - closeSize.width) / 2, (height - closeSize.height) / 2,
+				closeSize.width, closeSize.height, closeArc, closeArc );
 		}
 
 		// set cross color
-		Color fg = FlatButtonUI.buttonStateColor( c, foreground, null, null, hoverForeground, pressedForeground );
+		Color fg = FlatButtonUI.buttonStateColor( c, closeForeground, null, null, closeHoverForeground, closePressedForeground );
 		g.setColor( FlatUIUtils.deriveColor( fg, c.getForeground() ) );
 
 		float mx = width / 2;
 		float my = height / 2;
-		float r = ((bg != null) ? crossFilledSize : crossPlainSize) / 2;
+		float r = ((bg != null) ? closeCrossFilledSize : closeCrossPlainSize) / 2;
 
 		// paint cross
 		Path2D path = new Path2D.Float( Path2D.WIND_EVEN_ODD );

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatTreeClosedIcon.java

@@ -37,6 +37,8 @@ public class FlatTreeClosedIcon
 
 	@Override
 	protected void paintIcon( Component c, Graphics2D g ) {
+		FlatTreeCollapsedIcon.setStyleColorFromTreeUI( c, g, ui -> ui.iconClosedColor );
+
 		/*
 			<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16">
 			  <polygon fill="#6E6E6E" fill-rule="evenodd" points="1 2 6 2 8 4 15 4 15 13 1 13"/>

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatTreeCollapsedIcon.java

@@ -19,7 +19,12 @@ package com.formdev.flatlaf.icons;
 import java.awt.Color;
 import java.awt.Component;
 import java.awt.Graphics2D;
+import java.util.function.Function;
+import javax.swing.JTree;
+import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
+import javax.swing.plaf.TreeUI;
+import com.formdev.flatlaf.ui.FlatTreeUI;
 import com.formdev.flatlaf.ui.FlatUIUtils;
 
 /**
@@ -46,8 +51,12 @@ public class FlatTreeCollapsedIcon
 
 	@Override
 	protected void paintIcon( Component c, Graphics2D g ) {
+		setStyleColorFromTreeUI( c, g );
 		rotate( c, g );
 
+		String arrowType = getStyleFromTreeUI( c, ui -> ui.iconArrowType );
+		boolean chevron = (arrowType != null) ? FlatUIUtils.isChevron( arrowType ) : this.chevron;
+
 		if( chevron ) {
 			// chevron arrow
 			g.fill( FlatUIUtils.createPath( 3,1, 3,2.5, 6,5.5, 3,8.5, 3,10, 4.5,10, 9,5.5, 4.5,1 ) );
@@ -57,8 +66,34 @@ public class FlatTreeCollapsedIcon
 		}
 	}
 
+	void setStyleColorFromTreeUI( Component c, Graphics2D g ) {
+		setStyleColorFromTreeUI( c, g, ui -> ui.iconCollapsedColor );
+	}
+
 	void rotate( Component c, Graphics2D g ) {
 		if( !c.getComponentOrientation().isLeftToRight() )
 			g.rotate( Math.toRadians( 180 ), width / 2., height / 2. );
 	}
+
+	/**
+	 * Because this icon is always shared for all trees,
+	 * get icon specific style from FlatTreeUI.
+	 */
+	static <T> T getStyleFromTreeUI( Component c, Function<FlatTreeUI, T> f ) {
+		JTree tree = (c instanceof JTree)
+			? (JTree) c
+			: (JTree) SwingUtilities.getAncestorOfClass( JTree.class, c );
+		if( tree != null ) {
+			TreeUI ui = tree.getUI();
+			if( ui instanceof FlatTreeUI )
+				return f.apply( (FlatTreeUI) ui );
+		}
+		return null;
+	}
+
+	static void setStyleColorFromTreeUI( Component c, Graphics2D g, Function<FlatTreeUI, Color> f ) {
+		Color color = getStyleFromTreeUI( c, f );
+		if( color != null )
+			g.setColor( color );
+	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatTreeExpandedIcon.java

@@ -34,6 +34,11 @@ public class FlatTreeExpandedIcon
 		super( UIManager.getColor( "Tree.icon.expandedColor" ) );
 	}
 
+	@Override
+	void setStyleColorFromTreeUI( Component c, Graphics2D g ) {
+		setStyleColorFromTreeUI( c, g, ui -> ui.iconExpandedColor );
+	}
+
 	@Override
 	void rotate( Component c, Graphics2D g ) {
 		g.rotate( Math.toRadians( 90 ), width / 2., height / 2. );

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatTreeLeafIcon.java

@@ -37,6 +37,8 @@ public class FlatTreeLeafIcon
 
 	@Override
 	protected void paintIcon( Component c, Graphics2D g ) {
+		FlatTreeCollapsedIcon.setStyleColorFromTreeUI( c, g, ui -> ui.iconLeafColor );
+
 		/*
 			<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16">
 			  <g fill="none" fill-rule="evenodd">

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatTreeOpenIcon.java

@@ -37,6 +37,8 @@ public class FlatTreeOpenIcon
 
 	@Override
 	protected void paintIcon( Component c, Graphics2D g ) {
+		FlatTreeCollapsedIcon.setStyleColorFromTreeUI( c, g, ui -> ui.iconOpenColor );
+
 		/*
 			<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16">
 			  <g fill="none" fill-rule="evenodd">

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatWindowAbstractIcon.java

@@ -20,6 +20,7 @@ import java.awt.Color;
 import java.awt.Component;
 import java.awt.Dimension;
 import java.awt.Graphics2D;
+import java.awt.RenderingHints;
 import javax.swing.UIManager;
 import com.formdev.flatlaf.ui.FlatButtonUI;
 import com.formdev.flatlaf.ui.FlatUIUtils;
@@ -65,8 +66,14 @@ public abstract class FlatWindowAbstractIcon
 	protected void paintBackground( Component c, Graphics2D g ) {
 		Color background = FlatButtonUI.buttonStateColor( c, null, null, null, hoverBackground, pressedBackground );
 		if( background != null ) {
+			// disable antialiasing for background rectangle painting to avoid blury edges when scaled (e.g. at 125% or 175%)
+			Object oldHint = g.getRenderingHint( RenderingHints.KEY_ANTIALIASING );
+			g.setRenderingHint( RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_OFF );
+
 			g.setColor( FlatUIUtils.deriveColor( background, c.getBackground() ) );
 			g.fillRect( 0, 0, width, height );
+
+			g.setRenderingHint( RenderingHints.KEY_ANTIALIASING, oldHint );
 		}
 	}
 

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatWindowCloseIcon.java

@@ -24,6 +24,7 @@ import java.awt.geom.Line2D;
 import java.awt.geom.Path2D;
 import javax.swing.UIManager;
 import com.formdev.flatlaf.ui.FlatButtonUI;
+import com.formdev.flatlaf.util.SystemInfo;
 
 /**
  * "close" icon for windows (frames and dialogs).
@@ -54,7 +55,7 @@ public class FlatWindowCloseIcon
 		int iy = y + ((height - iwh) / 2);
 		int ix2 = ix + iwh - 1;
 		int iy2 = iy + iwh - 1;
-		int thickness = (int) scaleFactor;
+		float thickness = SystemInfo.isWindows_11_orLater ? (float) scaleFactor : (int) scaleFactor;
 
 		Path2D path = new Path2D.Float( Path2D.WIND_EVEN_ODD );
 		path.append( new Line2D.Float( ix, iy, ix2, iy2 ), false );

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatWindowMaximizeIcon.java

@@ -18,6 +18,7 @@ package com.formdev.flatlaf.icons;
 
 import java.awt.Graphics2D;
 import com.formdev.flatlaf.ui.FlatUIUtils;
+import com.formdev.flatlaf.util.SystemInfo;
 
 /**
  * "maximize" icon for windows (frames and dialogs).
@@ -35,8 +36,11 @@ public class FlatWindowMaximizeIcon
 		int iwh = (int) (10 * scaleFactor);
 		int ix = x + ((width - iwh) / 2);
 		int iy = y + ((height - iwh) / 2);
-		int thickness = (int) scaleFactor;
+		float thickness = SystemInfo.isWindows_11_orLater ? (float) scaleFactor : (int) scaleFactor;
+		int arc = Math.max( (int) (1.5 * scaleFactor), 2 );
 
-		g.fill( FlatUIUtils.createRectangle( ix, iy, iwh, iwh, thickness ) );
+		g.fill( SystemInfo.isWindows_11_orLater
+			? FlatUIUtils.createRoundRectangle( ix, iy, iwh, iwh, thickness, arc, arc, arc, arc )
+			: FlatUIUtils.createRectangle( ix, iy, iwh, iwh, thickness ) );
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/icons/FlatWindowRestoreIcon.java

@@ -21,6 +21,7 @@ import java.awt.geom.Area;
 import java.awt.geom.Path2D;
 import java.awt.geom.Rectangle2D;
 import com.formdev.flatlaf.ui.FlatUIUtils;
+import com.formdev.flatlaf.util.SystemInfo;
 
 /**
  * "restore" icon for windows (frames and dialogs).
@@ -38,18 +39,33 @@ public class FlatWindowRestoreIcon
 		int iwh = (int) (10 * scaleFactor);
 		int ix = x + ((width - iwh) / 2);
 		int iy = y + ((height - iwh) / 2);
-		int thickness = (int) scaleFactor;
+		float thickness = SystemInfo.isWindows_11_orLater ? (float) scaleFactor : (int) scaleFactor;
+		int arc = Math.max( (int) (1.5 * scaleFactor), 2 );
+		int arcOuter = (int) (arc + (1.5 * scaleFactor));
 
 		int rwh = (int) (8 * scaleFactor);
 		int ro2 = iwh - rwh;
 
-		Path2D r1 = FlatUIUtils.createRectangle( ix + ro2, iy, rwh, rwh, thickness );
-		Path2D r2 = FlatUIUtils.createRectangle( ix, iy + ro2, rwh, rwh, thickness );
+		// upper-right rectangle
+		Path2D r1 = SystemInfo.isWindows_11_orLater
+			? FlatUIUtils.createRoundRectangle( ix + ro2, iy, rwh, rwh, thickness, arc, arcOuter, arc, arc )
+			: FlatUIUtils.createRectangle( ix + ro2, iy, rwh, rwh, thickness );
 
+		// lower-left rectangle
+		Path2D r2 = SystemInfo.isWindows_11_orLater
+			? FlatUIUtils.createRoundRectangle( ix, iy + ro2, rwh, rwh, thickness, arc, arc, arc, arc )
+			: FlatUIUtils.createRectangle( ix, iy + ro2, rwh, rwh, thickness );
+
+		// paint upper-right rectangle
 		Area area = new Area( r1 );
-		area.subtract( new Area( new Rectangle2D.Float( ix, iy + ro2, rwh, rwh ) ) );
+		if( SystemInfo.isWindows_11_orLater ) {
+			area.subtract( new Area( new Rectangle2D.Float( ix, (float) (iy + scaleFactor), rwh, rwh ) ) );
+			area.subtract( new Area( new Rectangle2D.Float( (float) (ix + scaleFactor), iy + ro2, rwh, rwh ) ) );
+		} else
+			area.subtract( new Area( new Rectangle2D.Float( ix, iy + ro2, rwh, rwh ) ) );
 		g.fill( area );
 
+		// paint lower-left rectangle
 		g.fill( r2 );
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/resources/EmptyPackage.java

@@ -0,0 +1,28 @@
+/*
+ * Copyright 2021 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.resources;
+
+/**
+ * The only purpose of this file is to add a .class file to this package to make it non-empty.
+ * Otherwise, the compiler outputs a warning because this package is opened in module-info.java.
+ * Also, when using --patch-module (e.g. from an IDE), an error would occur for empty packages.
+ *
+ * @author Karl Tauber
+ */
+interface EmptyPackage
+{
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatArrowButton.java

@@ -25,6 +25,7 @@ import java.awt.Graphics2D;
 import java.awt.event.MouseAdapter;
 import java.awt.event.MouseEvent;
 import javax.swing.JComponent;
+import javax.swing.SwingUtilities;
 import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicArrowButton;
 
@@ -37,19 +38,19 @@ public class FlatArrowButton
 	extends BasicArrowButton
 	implements UIResource
 {
-	public static final int DEFAULT_ARROW_WIDTH = 8;
+	public static final int DEFAULT_ARROW_WIDTH = 9;
 
-	protected final boolean chevron;
-	protected final Color foreground;
-	protected final Color disabledForeground;
-	protected final Color hoverForeground;
-	protected final Color hoverBackground;
-	protected final Color pressedForeground;
-	protected final Color pressedBackground;
+	protected boolean chevron;
+	protected Color foreground;
+	protected Color disabledForeground;
+	protected Color hoverForeground;
+	protected Color hoverBackground;
+	protected Color pressedForeground;
+	protected Color pressedBackground;
 
 	private int arrowWidth = DEFAULT_ARROW_WIDTH;
-	private int xOffset = 0;
-	private int yOffset = 0;
+	private float xOffset = 0;
+	private float yOffset = 0;
 
 	private boolean hover;
 	private boolean pressed;
@@ -58,14 +59,8 @@ public class FlatArrowButton
 		Color hoverForeground, Color hoverBackground, Color pressedForeground, Color pressedBackground )
 	{
 		super( direction, Color.WHITE, Color.WHITE, Color.WHITE, Color.WHITE );
-
-		this.chevron = FlatUIUtils.isChevron( type );
-		this.foreground = foreground;
-		this.disabledForeground = disabledForeground;
-		this.hoverForeground = hoverForeground;
-		this.hoverBackground = hoverBackground;
-		this.pressedForeground = pressedForeground;
-		this.pressedBackground = pressedBackground;
+		updateStyle( type, foreground, disabledForeground, hoverForeground, hoverBackground,
+			pressedForeground, pressedBackground );
 
 		setOpaque( false );
 		setBorder( null );
@@ -88,19 +83,36 @@ public class FlatArrowButton
 
 				@Override
 				public void mousePressed( MouseEvent e ) {
-					pressed = true;
-					repaint();
+					if( SwingUtilities.isLeftMouseButton( e ) ) {
+						pressed = true;
+						repaint();
+					}
 				}
 
 				@Override
 				public void mouseReleased( MouseEvent e ) {
-					pressed = false;
-					repaint();
+					if( SwingUtilities.isLeftMouseButton( e ) ) {
+						pressed = false;
+						repaint();
+					}
 				}
 			} );
 		}
 	}
 
+	/** @since 2 */
+	public void updateStyle( String type, Color foreground, Color disabledForeground,
+		Color hoverForeground, Color hoverBackground, Color pressedForeground, Color pressedBackground )
+	{
+		this.chevron = FlatUIUtils.isChevron( type );
+		this.foreground = foreground;
+		this.disabledForeground = disabledForeground;
+		this.hoverForeground = hoverForeground;
+		this.hoverBackground = hoverBackground;
+		this.pressedForeground = pressedForeground;
+		this.pressedBackground = pressedBackground;
+	}
+
 	public int getArrowWidth() {
 		return arrowWidth;
 	}
@@ -117,19 +129,19 @@ public class FlatArrowButton
 		return pressed;
 	}
 
-	public int getXOffset() {
+	public float getXOffset() {
 		return xOffset;
 	}
 
-	public void setXOffset( int xOffset ) {
+	public void setXOffset( float xOffset ) {
 		this.xOffset = xOffset;
 	}
 
-	public int getYOffset() {
+	public float getYOffset() {
 		return yOffset;
 	}
 
-	public void setYOffset( int yOffset ) {
+	public void setYOffset( float yOffset ) {
 		this.yOffset = yOffset;
 	}
 
@@ -141,6 +153,21 @@ public class FlatArrowButton
 		return FlatUIUtils.deriveColor( foreground, this.foreground );
 	}
 
+	/**
+	 * Returns the color used to paint the arrow.
+	 *
+	 * @since 1.2
+	 */
+	protected Color getArrowColor() {
+		return isEnabled()
+			? (pressedForeground != null && isPressed()
+				? pressedForeground
+				: (hoverForeground != null && isHover()
+					? hoverForeground
+					: foreground))
+			: disabledForeground;
+	}
+
 	@Override
 	public Dimension getPreferredSize() {
 		return scale( super.getPreferredSize() );
@@ -170,13 +197,7 @@ public class FlatArrowButton
 		}
 
 		// paint arrow
-		g.setColor( deriveForeground( isEnabled()
-			? (pressedForeground != null && isPressed()
-				? pressedForeground
-				: (hoverForeground != null && isHover()
-					? hoverForeground
-					: foreground))
-			: disabledForeground ) );
+		g.setColor( deriveForeground( getArrowColor() ) );
 		paintArrow( (Graphics2D) g );
 
 		FlatUIUtils.resetRenderingHints( g, oldRenderingHints );
@@ -195,6 +216,6 @@ public class FlatArrowButton
 		if( vert && parent instanceof JComponent && FlatUIUtils.hasRoundBorder( (JComponent) parent ) )
 			x -= scale( parent.getComponentOrientation().isLeftToRight() ? 1 : -1 );
 
-		FlatUIUtils.paintArrow( g, x, 0, getWidth(), getHeight(), getDirection(), chevron, arrowWidth, xOffset, yOffset );
+		FlatUIUtils.paintArrow( g, x, 0, getWidth(), getHeight(), getDirection(), chevron, getArrowWidth(), getXOffset(), getYOffset() );
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatBorder.java

@@ -22,34 +22,35 @@ import java.awt.Component;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
 import java.awt.Insets;
-import java.awt.KeyboardFocusManager;
 import java.awt.Paint;
+import java.util.Map;
 import javax.swing.JComboBox;
 import javax.swing.JComponent;
 import javax.swing.JScrollPane;
 import javax.swing.JSpinner;
-import javax.swing.JTable;
-import javax.swing.JTextField;
-import javax.swing.JTree;
 import javax.swing.JViewport;
-import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
 import javax.swing.plaf.basic.BasicBorders;
 import com.formdev.flatlaf.FlatClientProperties;
+import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableBorder;
 import com.formdev.flatlaf.util.DerivedColor;
 
 /**
  * Border for various components (e.g. {@link javax.swing.JTextField}).
- *
+ * <p>
  * There is empty space around the component border, if Component.focusWidth is greater than zero,
  * which is used to paint outer focus border.
- *
+ * <p>
  * Because there is empty space (if outer focus border is not painted),
  * UI delegates that use this border (or subclasses) must invoke
- * {@link FlatUIUtils#paintParentBackground} to paint the empty space correctly.
+ * {@link FlatUIUtils#paintParentBackground} to fill the empty space correctly.
  *
  * @uiDefault Component.focusWidth						int
  * @uiDefault Component.innerFocusWidth					int or float
+ * @uiDefault Component.innerOutlineWidth				int or float
+ * @uiDefault Component.borderWidth						int or float
+ *
  * @uiDefault Component.focusColor						Color
  * @uiDefault Component.borderColor						Color
  * @uiDefault Component.disabledBorderColor				Color
@@ -65,20 +66,46 @@ import com.formdev.flatlaf.util.DerivedColor;
  */
 public class FlatBorder
 	extends BasicBorders.MarginBorder
+	implements StyleableBorder
 {
-	protected final int focusWidth = UIManager.getInt( "Component.focusWidth" );
-	protected final float innerFocusWidth = FlatUIUtils.getUIFloat( "Component.innerFocusWidth", 0 );
-	protected final float innerOutlineWidth = FlatUIUtils.getUIFloat( "Component.innerOutlineWidth", 0 );
-	protected final Color focusColor = UIManager.getColor( "Component.focusColor" );
-	protected final Color borderColor = UIManager.getColor( "Component.borderColor" );
-	protected final Color disabledBorderColor = UIManager.getColor( "Component.disabledBorderColor" );
-	protected final Color focusedBorderColor = UIManager.getColor( "Component.focusedBorderColor" );
+	@Styleable protected int focusWidth = UIManager.getInt( "Component.focusWidth" );
+	@Styleable protected float innerFocusWidth = FlatUIUtils.getUIFloat( "Component.innerFocusWidth", 0 );
+	@Styleable protected float innerOutlineWidth = FlatUIUtils.getUIFloat( "Component.innerOutlineWidth", 0 );
+	/** @since 2 */ @Styleable protected float borderWidth = FlatUIUtils.getUIFloat( "Component.borderWidth", 1 );
 
-	protected final Color errorBorderColor = UIManager.getColor( "Component.error.borderColor" );
-	protected final Color errorFocusedBorderColor = UIManager.getColor( "Component.error.focusedBorderColor" );
-	protected final Color warningBorderColor = UIManager.getColor( "Component.warning.borderColor" );
-	protected final Color warningFocusedBorderColor = UIManager.getColor( "Component.warning.focusedBorderColor" );
-	protected final Color customBorderColor = UIManager.getColor( "Component.custom.borderColor" );
+	@Styleable protected Color focusColor = UIManager.getColor( "Component.focusColor" );
+	@Styleable protected Color borderColor = UIManager.getColor( "Component.borderColor" );
+	@Styleable protected Color disabledBorderColor = UIManager.getColor( "Component.disabledBorderColor" );
+	@Styleable protected Color focusedBorderColor = UIManager.getColor( "Component.focusedBorderColor" );
+
+	@Styleable(dot=true) protected Color errorBorderColor = UIManager.getColor( "Component.error.borderColor" );
+	@Styleable(dot=true) protected Color errorFocusedBorderColor = UIManager.getColor( "Component.error.focusedBorderColor" );
+	@Styleable(dot=true) protected Color warningBorderColor = UIManager.getColor( "Component.warning.borderColor" );
+	@Styleable(dot=true) protected Color warningFocusedBorderColor = UIManager.getColor( "Component.warning.focusedBorderColor" );
+	@Styleable(dot=true) protected Color customBorderColor = UIManager.getColor( "Component.custom.borderColor" );
+
+	// only used via styling (not in UI defaults, but has likewise client properties)
+	/** @since 2 */ @Styleable protected String outline;
+	/** @since 2 */ @Styleable protected Color outlineColor;
+	/** @since 2 */ @Styleable protected Color outlineFocusedColor;
+
+	/** @since 2 */
+	@Override
+	public Object applyStyleProperty( String key, Object value ) {
+		return FlatStylingSupport.applyToAnnotatedObject( this, key, value );
+	}
+
+	/** @since 2 */
+	@Override
+	public Map<String, Class<?>> getStyleableInfos() {
+		return FlatStylingSupport.getAnnotatedStyleableInfos( this );
+	}
+
+	/** @since 2.5 */
+	@Override
+	public Object getStyleableValue( String key ) {
+		return FlatStylingSupport.getAnnotatedStyleableValue( this, key );
+	}
 
 	@Override
 	public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
@@ -87,9 +114,11 @@ public class FlatBorder
 			FlatUIUtils.setRenderingHints( g2 );
 
 			float focusWidth = scale( (float) getFocusWidth( c ) );
-			float borderWidth = scale( (float) getBorderWidth( c ) );
+			float focusInnerWidth = 0;
+			float borderWidth = scale( getBorderWidth( c ) );
 			float arc = scale( (float) getArc( c ) );
 			Color outlineColor = getOutlineColor( c );
+			Color focusColor = null;
 
 			// paint outer border
 			if( outlineColor != null || isFocused( c ) ) {
@@ -98,15 +127,16 @@ public class FlatBorder
 					: 0;
 
 				if( focusWidth > 0 || innerWidth > 0 ) {
-					g2.setColor( (outlineColor != null) ? outlineColor : getFocusColor( c ) );
-					FlatUIUtils.paintComponentOuterBorder( g2, x, y, width, height,
-						focusWidth, borderWidth + scale( innerWidth ), arc );
+					focusColor = (outlineColor != null) ? outlineColor : getFocusColor( c );
+					focusInnerWidth = borderWidth + scale( innerWidth );
 				}
 			}
 
 			// paint border
-			g2.setPaint( (outlineColor != null) ? outlineColor : getBorderColor( c ) );
-			FlatUIUtils.paintComponentBorder( g2, x, y, width, height, focusWidth, borderWidth, arc );
+			Paint borderColor = (outlineColor != null) ? outlineColor : getBorderColor( c );
+			FlatUIUtils.paintOutlinedComponent( g2, x, y, width, height,
+				focusWidth, 1, focusInnerWidth, borderWidth, arc,
+				focusColor, borderColor, null );
 		} finally {
 			g2.dispose();
 		}
@@ -121,6 +151,17 @@ public class FlatBorder
 			return null;
 
 		Object outline = ((JComponent)c).getClientProperty( FlatClientProperties.OUTLINE );
+		if( outline == null )
+			outline = this.outline;
+		if( outline == null ) {
+			if( outlineColor != null && outlineFocusedColor != null )
+				outline = new Color[] { outlineFocusedColor, outlineColor };
+			else if( outlineColor != null )
+				outline = outlineColor;
+			else if( outlineFocusedColor != null )
+				outline = outlineFocusedColor;
+		}
+
 		if( outline instanceof String ) {
 			switch( (String) outline ) {
 				case FlatClientProperties.OUTLINE_ERROR:
@@ -164,37 +205,13 @@ public class FlatBorder
 	}
 
 	protected boolean isFocused( Component c ) {
-		if( c instanceof JScrollPane ) {
-			JViewport viewport = ((JScrollPane)c).getViewport();
-			Component view = (viewport != null) ? viewport.getView() : null;
-			if( view != null ) {
-				if( FlatUIUtils.isPermanentFocusOwner( view ) )
-					return true;
-
-				if( (view instanceof JTable && ((JTable)view).isEditing()) ||
-					(view instanceof JTree && ((JTree)view).isEditing()) )
-				{
-					Component focusOwner = KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner();
-					if( focusOwner != null )
-						return SwingUtilities.isDescendingFrom( focusOwner, view );
-				}
-			}
-			return false;
-		} else if( c instanceof JComboBox && ((JComboBox<?>)c).isEditable() ) {
-			Component editorComponent = ((JComboBox<?>)c).getEditor().getEditorComponent();
-			return (editorComponent != null) ? FlatUIUtils.isPermanentFocusOwner( editorComponent ) : false;
-		} else if( c instanceof JSpinner ) {
-			if( FlatUIUtils.isPermanentFocusOwner( c ) )
-				return true;
-
-			JComponent editor = ((JSpinner)c).getEditor();
-			if( editor instanceof JSpinner.DefaultEditor ) {
-				JTextField textField = ((JSpinner.DefaultEditor)editor).getTextField();
-				if( textField != null )
-					return FlatUIUtils.isPermanentFocusOwner( textField );
-			}
-			return false;
-		} else
+		if( c instanceof JScrollPane )
+			return FlatScrollPaneUI.isPermanentFocusOwner( (JScrollPane) c );
+		else if( c instanceof JComboBox )
+			return FlatComboBoxUI.isPermanentFocusOwner( (JComboBox<?>) c );
+		else if( c instanceof JSpinner )
+			return FlatSpinnerUI.isPermanentFocusOwner( (JSpinner) c );
+		else
 			return FlatUIUtils.isPermanentFocusOwner( c );
 	}
 
@@ -205,13 +222,14 @@ public class FlatBorder
 	@Override
 	public Insets getBorderInsets( Component c, Insets insets ) {
 		float focusWidth = scale( (float) getFocusWidth( c ) );
-		float ow = focusWidth + scale( (float) getLineWidth( c ) );
+		int ow = Math.round( focusWidth + scale( (float) getLineWidth( c ) ) );
 
 		insets = super.getBorderInsets( c, insets );
-		insets.top = Math.round( scale( (float) insets.top ) + ow );
-		insets.left = Math.round( scale( (float) insets.left ) + ow );
-		insets.bottom = Math.round( scale( (float) insets.bottom ) + ow );
-		insets.right = Math.round( scale( (float) insets.right ) + ow );
+
+		insets.top = scale( insets.top ) + ow;
+		insets.left = scale( insets.left ) + ow;
+		insets.bottom = scale( insets.bottom ) + ow;
+		insets.right = scale( insets.right ) + ow;
 
 		if( isCellEditor( c ) ) {
 			// remove top and bottom insets if used as cell editor
@@ -256,8 +274,8 @@ public class FlatBorder
 	 * Returns the (unscaled) line thickness used to paint the border.
 	 * This may be different to {@link #getLineWidth}.
 	 */
-	protected int getBorderWidth( Component c ) {
-		return getLineWidth( c );
+	protected float getBorderWidth( Component c ) {
+		return borderWidth;
 	}
 
 	/**

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatButtonBorder.java

@@ -20,69 +20,115 @@ import java.awt.Color;
 import java.awt.Component;
 import java.awt.GradientPaint;
 import java.awt.Graphics;
+import java.awt.Graphics2D;
 import java.awt.Insets;
 import java.awt.Paint;
 import javax.swing.AbstractButton;
 import javax.swing.UIManager;
 import javax.swing.plaf.UIResource;
+import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
 import com.formdev.flatlaf.util.UIScale;
 
 /**
  * Border for {@link javax.swing.JButton}.
  *
+ * @uiDefault Button.arc						int
+ * @uiDefault Button.innerFocusWidth			int or float	optional; defaults to Component.innerFocusWidth
+ * @uiDefault Button.borderWidth				int or float	optional; defaults to Component.borderWidth
+ *
  * @uiDefault Button.borderColor				Color
  * @uiDefault Button.startBorderColor			Color	optional; if set, a gradient paint is used and Button.borderColor is ignored
  * @uiDefault Button.endBorderColor				Color	optional; if set, a gradient paint is used
  * @uiDefault Button.disabledBorderColor		Color
  * @uiDefault Button.focusedBorderColor			Color
  * @uiDefault Button.hoverBorderColor			Color	optional
+ *
+ * @uiDefault Button.default.borderWidth		int or float
  * @uiDefault Button.default.borderColor		Color
  * @uiDefault Button.default.startBorderColor	Color	optional; if set, a gradient paint is used and Button.default.borderColor is ignored
  * @uiDefault Button.default.endBorderColor		Color	optional; if set, a gradient paint is used
- * @uiDefault Button.default.hoverBorderColor	Color	optional
  * @uiDefault Button.default.focusedBorderColor	Color
  * @uiDefault Button.default.focusColor			Color
- * @uiDefault Button.borderWidth				int
- * @uiDefault Button.default.borderWidth		int
- * @uiDefault Button.innerFocusWidth			int or float	optional; defaults to Component.innerFocusWidth
+ * @uiDefault Button.default.hoverBorderColor	Color	optional
+ *
+ * @uiDefault Button.toolbar.focusWidth			int or float		optional; default is 1.5
+ * @uiDefault Button.toolbar.focusColor			Color	optional; defaults to Component.focusColor
  * @uiDefault Button.toolbar.margin				Insets
  * @uiDefault Button.toolbar.spacingInsets		Insets
- * @uiDefault Button.arc						int
  *
  * @author Karl Tauber
  */
 public class FlatButtonBorder
 	extends FlatBorder
 {
-	protected final Color borderColor = FlatUIUtils.getUIColor( "Button.startBorderColor", "Button.borderColor" );
-	protected final Color endBorderColor = UIManager.getColor( "Button.endBorderColor" );
-	protected final Color disabledBorderColor = UIManager.getColor( "Button.disabledBorderColor" );
-	protected final Color focusedBorderColor = UIManager.getColor( "Button.focusedBorderColor" );
-	protected final Color hoverBorderColor = UIManager.getColor( "Button.hoverBorderColor" );
-	protected final Color defaultBorderColor = FlatUIUtils.getUIColor( "Button.default.startBorderColor", "Button.default.borderColor" );
-	protected final Color defaultEndBorderColor = UIManager.getColor( "Button.default.endBorderColor" );
-	protected final Color defaultHoverBorderColor = UIManager.getColor( "Button.default.hoverBorderColor" );
-	protected final Color defaultFocusedBorderColor = UIManager.getColor( "Button.default.focusedBorderColor" );
-	protected final Color defaultFocusColor = UIManager.getColor( "Button.default.focusColor" );
-	protected final int borderWidth = UIManager.getInt( "Button.borderWidth" );
-	protected final int defaultBorderWidth = UIManager.getInt( "Button.default.borderWidth" );
-	protected final float buttonInnerFocusWidth = FlatUIUtils.getUIFloat( "Button.innerFocusWidth", innerFocusWidth );
-	protected final Insets toolbarMargin = UIManager.getInsets( "Button.toolbar.margin" );
-	protected final Insets toolbarSpacingInsets = UIManager.getInsets( "Button.toolbar.spacingInsets" );
-	protected final int arc = UIManager.getInt( "Button.arc" );
+	@Styleable protected int arc = UIManager.getInt( "Button.arc" );
+
+	protected Color endBorderColor = UIManager.getColor( "Button.endBorderColor" );
+	@Styleable protected Color hoverBorderColor = UIManager.getColor( "Button.hoverBorderColor" );
+
+	@Styleable(dot=true) protected float defaultBorderWidth = FlatUIUtils.getUIFloat( "Button.default.borderWidth", 1 );
+	@Styleable(dot=true) protected Color defaultBorderColor = FlatUIUtils.getUIColor( "Button.default.startBorderColor", "Button.default.borderColor" );
+	protected Color defaultEndBorderColor = UIManager.getColor( "Button.default.endBorderColor" );
+	@Styleable(dot=true) protected Color defaultFocusedBorderColor = UIManager.getColor( "Button.default.focusedBorderColor" );
+	@Styleable(dot=true) protected Color defaultFocusColor = UIManager.getColor( "Button.default.focusColor" );
+	@Styleable(dot=true) protected Color defaultHoverBorderColor = UIManager.getColor( "Button.default.hoverBorderColor" );
+
+	/** @since 1.4 */ @Styleable(dot=true) protected float toolbarFocusWidth = FlatUIUtils.getUIFloat( "Button.toolbar.focusWidth", 1.5f );
+	/** @since 1.4 */ @Styleable(dot=true) protected Color toolbarFocusColor = UIManager.getColor( "Button.toolbar.focusColor" );
+	@Styleable(dot=true) protected Insets toolbarMargin = UIManager.getInsets( "Button.toolbar.margin" );
+	@Styleable(dot=true) protected Insets toolbarSpacingInsets = UIManager.getInsets( "Button.toolbar.spacingInsets" );
+
+	public FlatButtonBorder() {
+		innerFocusWidth = FlatUIUtils.getUIFloat( "Button.innerFocusWidth", innerFocusWidth );
+		borderWidth = FlatUIUtils.getUIFloat( "Button.borderWidth", borderWidth );
+
+		borderColor = FlatUIUtils.getUIColor( "Button.startBorderColor", "Button.borderColor" );
+		disabledBorderColor = UIManager.getColor( "Button.disabledBorderColor" );
+		focusedBorderColor = UIManager.getColor( "Button.focusedBorderColor" );
+	}
 
 	@Override
 	public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
 		if( FlatButtonUI.isContentAreaFilled( c ) &&
 			!FlatButtonUI.isToolBarButton( c ) &&
+			(!FlatButtonUI.isBorderlessButton( c ) || FlatUIUtils.isPermanentFocusOwner( c )) &&
 			!FlatButtonUI.isHelpButton( c ) &&
 			!FlatToggleButtonUI.isTabButton( c ) )
 		  super.paintBorder( c, g, x, y, width, height );
+		else if( FlatButtonUI.isToolBarButton( c ) && isFocused( c ) )
+			paintToolBarFocus( c, g, x, y, width, height );
+	}
+
+	/** @since 1.4 */
+	protected void paintToolBarFocus( Component c, Graphics g, int x, int y, int width, int height ) {
+		Graphics2D g2 = (Graphics2D) g.create();
+		try {
+			FlatUIUtils.setRenderingHints( g2 );
+
+			float focusWidth = UIScale.scale( toolbarFocusWidth );
+			float arc = UIScale.scale( (float) getArc( c ) );
+			Color outlineColor = getOutlineColor( c );
+
+			Insets spacing = UIScale.scale( toolbarSpacingInsets );
+			x += spacing.left;
+			y += spacing.top;
+			width -= spacing.left + spacing.right;
+			height -= spacing.top + spacing.bottom;
+
+			Color color = (outlineColor != null) ? outlineColor : getFocusColor( c );
+			// not using focus border painting of paintOutlinedComponent() here
+			// because its round edges look too "thick"
+			FlatUIUtils.paintOutlinedComponent( g2, x, y, width, height, 0, 0, 0, focusWidth, arc, null, color, null );
+		} finally {
+			g2.dispose();
+		}
 	}
 
 	@Override
 	protected Color getFocusColor( Component c ) {
-		return FlatButtonUI.isDefaultButton( c ) ? defaultFocusColor : super.getFocusColor( c );
+		return (toolbarFocusColor != null && FlatButtonUI.isToolBarButton( c ))
+			? toolbarFocusColor
+			: (FlatButtonUI.isDefaultButton( c ) ? defaultFocusColor : super.getFocusColor( c ));
 	}
 
 	@Override
@@ -113,7 +159,7 @@ public class FlatButtonBorder
 	public Insets getBorderInsets( Component c, Insets insets ) {
 		if( FlatButtonUI.isToolBarButton( c ) ) {
 			// In toolbars, use button margin only if explicitly set.
-			// Otherwise use toolbar margin specified in UI defaults.
+			// Otherwise, use toolbar margin specified in UI defaults.
 			Insets margin = (c instanceof AbstractButton)
 				? ((AbstractButton)c).getMargin()
 				: null;
@@ -137,12 +183,7 @@ public class FlatButtonBorder
 	}
 
 	@Override
-	protected float getInnerFocusWidth( Component c ) {
-		return buttonInnerFocusWidth;
-	}
-
-	@Override
-	protected int getBorderWidth( Component c ) {
+	protected float getBorderWidth( Component c ) {
 		return FlatButtonUI.isDefaultButton( c ) ? defaultBorderWidth : borderWidth;
 	}
 

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatButtonUI.java

@@ -30,20 +30,33 @@ import java.awt.Insets;
 import java.awt.Rectangle;
 import java.awt.geom.RoundRectangle2D;
 import java.beans.PropertyChangeEvent;
+import java.util.Map;
+import java.util.Objects;
+import java.util.concurrent.atomic.AtomicBoolean;
 import javax.swing.AbstractButton;
 import javax.swing.ButtonModel;
 import javax.swing.Icon;
 import javax.swing.JButton;
 import javax.swing.JComponent;
+import javax.swing.JTextField;
 import javax.swing.JToggleButton;
 import javax.swing.JToolBar;
 import javax.swing.LookAndFeel;
+import javax.swing.SwingConstants;
+import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
+import javax.swing.plaf.ButtonUI;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicButtonListener;
 import javax.swing.plaf.basic.BasicButtonUI;
+import com.formdev.flatlaf.FlatClientProperties;
 import com.formdev.flatlaf.FlatLaf;
+import com.formdev.flatlaf.icons.FlatHelpButtonIcon;
+import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableUI;
+import com.formdev.flatlaf.ui.FlatStylingSupport.UnknownStyleException;
+import com.formdev.flatlaf.util.LoggingFacade;
 import com.formdev.flatlaf.util.UIScale;
 
 /**
@@ -65,20 +78,27 @@ import com.formdev.flatlaf.util.UIScale;
  * @uiDefault Button.startBackground			Color	optional; if set, a gradient paint is used and Button.background is ignored
  * @uiDefault Button.endBackground				Color	optional; if set, a gradient paint is used
  * @uiDefault Button.focusedBackground			Color	optional
+ * @uiDefault Button.focusedForeground			Color	optional
  * @uiDefault Button.hoverBackground			Color	optional
+ * @uiDefault Button.hoverForeground			Color	optional
  * @uiDefault Button.pressedBackground			Color	optional
+ * @uiDefault Button.pressedForeground			Color	optional
  * @uiDefault Button.selectedBackground			Color
  * @uiDefault Button.selectedForeground			Color
  * @uiDefault Button.disabledBackground			Color	optional
  * @uiDefault Button.disabledText				Color
  * @uiDefault Button.disabledSelectedBackground	Color
+ * @uiDefault Button.disabledSelectedForeground	Color	optional
  * @uiDefault Button.default.background			Color
  * @uiDefault Button.default.startBackground	Color	optional; if set, a gradient paint is used and Button.default.background is ignored
  * @uiDefault Button.default.endBackground		Color	optional; if set, a gradient paint is used
  * @uiDefault Button.default.foreground			Color
  * @uiDefault Button.default.focusedBackground	Color	optional
+ * @uiDefault Button.default.focusedForeground	Color	optional
  * @uiDefault Button.default.hoverBackground	Color	optional
+ * @uiDefault Button.default.hoverForeground	Color	optional
  * @uiDefault Button.default.pressedBackground	Color	optional
+ * @uiDefault Button.default.pressedForeground	Color	optional
  * @uiDefault Button.default.boldText			boolean
  * @uiDefault Button.paintShadow				boolean	default is false
  * @uiDefault Button.shadowWidth				int		default is 2
@@ -86,15 +106,21 @@ import com.formdev.flatlaf.util.UIScale;
  * @uiDefault Button.default.shadowColor		Color	optional
  * @uiDefault Button.toolbar.spacingInsets		Insets
  * @uiDefault Button.toolbar.hoverBackground	Color
+ * @uiDefault Button.toolbar.hoverForeground	Color	optional
  * @uiDefault Button.toolbar.pressedBackground	Color
+ * @uiDefault Button.toolbar.pressedForeground	Color	optional
  * @uiDefault Button.toolbar.selectedBackground	Color
+ * @uiDefault Button.toolbar.selectedForeground	Color	optional
+ * @uiDefault Button.toolbar.disabledSelectedBackground	Color	optional
+ * @uiDefault Button.toolbar.disabledSelectedForeground	Color	optional
  *
  * @author Karl Tauber
  */
 public class FlatButtonUI
 	extends BasicButtonUI
+	implements StyleableUI
 {
-	protected int minimumWidth;
+	@Styleable protected int minimumWidth;
 	protected int iconTextGap;
 
 	protected Color background;
@@ -102,38 +128,81 @@ public class FlatButtonUI
 
 	protected Color startBackground;
 	protected Color endBackground;
-	protected Color focusedBackground;
-	protected Color hoverBackground;
-	protected Color pressedBackground;
-	protected Color selectedBackground;
-	protected Color selectedForeground;
-	protected Color disabledBackground;
-	protected Color disabledText;
-	protected Color disabledSelectedBackground;
+	@Styleable protected Color focusedBackground;
+	/** @since 2.3 */ @Styleable protected Color focusedForeground;
+	@Styleable protected Color hoverBackground;
+	/** @since 2.3 */ @Styleable protected Color hoverForeground;
+	@Styleable protected Color pressedBackground;
+	/** @since 2.3 */ @Styleable protected Color pressedForeground;
+	@Styleable protected Color selectedBackground;
+	@Styleable protected Color selectedForeground;
+	@Styleable protected Color disabledBackground;
+	@Styleable protected Color disabledText;
+	@Styleable protected Color disabledSelectedBackground;
+	/** @since 2.3 */ @Styleable protected Color disabledSelectedForeground;
 
-	protected Color defaultBackground;
+	@Styleable(dot=true) protected Color defaultBackground;
 	protected Color defaultEndBackground;
-	protected Color defaultForeground;
-	protected Color defaultFocusedBackground;
-	protected Color defaultHoverBackground;
-	protected Color defaultPressedBackground;
-	protected boolean defaultBoldText;
+	@Styleable(dot=true) protected Color defaultForeground;
+	@Styleable(dot=true) protected Color defaultFocusedBackground;
+	/** @since 2.3 */ @Styleable(dot=true) protected Color defaultFocusedForeground;
+	@Styleable(dot=true) protected Color defaultHoverBackground;
+	/** @since 2.3 */ @Styleable(dot=true) protected Color defaultHoverForeground;
+	@Styleable(dot=true) protected Color defaultPressedBackground;
+	/** @since 2.3 */ @Styleable(dot=true) protected Color defaultPressedForeground;
+	@Styleable(dot=true) protected boolean defaultBoldText;
 
-	protected int shadowWidth;
-	protected Color shadowColor;
-	protected Color defaultShadowColor;
+	@Styleable protected boolean paintShadow;
+	@Styleable protected int shadowWidth;
+	@Styleable protected Color shadowColor;
+	@Styleable(dot=true) protected Color defaultShadowColor;
 
-	protected Insets toolbarSpacingInsets;
-	protected Color toolbarHoverBackground;
-	protected Color toolbarPressedBackground;
-	protected Color toolbarSelectedBackground;
+	@Styleable(dot=true) protected Color toolbarHoverBackground;
+	/** @since 2.3 */ @Styleable(dot=true) protected Color toolbarHoverForeground;
+	@Styleable(dot=true) protected Color toolbarPressedBackground;
+	/** @since 2.3 */ @Styleable(dot=true) protected Color toolbarPressedForeground;
+	@Styleable(dot=true) protected Color toolbarSelectedBackground;
+	/** @since 2.3 */ @Styleable(dot=true) protected Color toolbarSelectedForeground;
+	/** @since 2.3 */ @Styleable(dot=true) protected Color toolbarDisabledSelectedBackground;
+	/** @since 2.3 */ @Styleable(dot=true) protected Color toolbarDisabledSelectedForeground;
+
+	// only used via styling (not in UI defaults, but has likewise client properties)
+	/** @since 2 */ @Styleable protected String buttonType;
+	/** @since 2 */ @Styleable protected boolean squareSize;
+	/** @since 2 */ @Styleable protected int minimumHeight;
 
 	private Icon helpButtonIcon;
+	private Insets defaultMargin;
 
+	private final boolean shared;
+	private boolean helpButtonIconShared = true;
 	private boolean defaults_initialized = false;
+	private Map<String, Object> oldStyleValues;
+	private AtomicBoolean borderShared;
 
 	public static ComponentUI createUI( JComponent c ) {
-		return FlatUIUtils.createSharedUI( FlatButtonUI.class, FlatButtonUI::new );
+		return FlatUIUtils.canUseSharedUI( c ) && !FlatUIUtils.needsLightAWTPeer( c )
+			? FlatUIUtils.createSharedUI( FlatButtonUI.class, () -> new FlatButtonUI( true ) )
+			: new FlatButtonUI( false );
+	}
+
+	/** @since 2 */
+	protected FlatButtonUI( boolean shared ) {
+		this.shared = shared;
+	}
+
+	@Override
+	public void installUI( JComponent c ) {
+		if( FlatUIUtils.needsLightAWTPeer( c ) )
+			FlatUIUtils.runWithLightAWTPeerUIDefaults( () -> installUIImpl( c ) );
+		else
+			installUIImpl( c );
+	}
+
+	private void installUIImpl( JComponent c ) {
+		super.installUI( c );
+
+		installStyle( (AbstractButton) c );
 	}
 
 	@Override
@@ -152,39 +221,47 @@ public class FlatButtonUI
 			startBackground = UIManager.getColor( prefix + "startBackground" );
 			endBackground = UIManager.getColor( prefix + "endBackground" );
 			focusedBackground = UIManager.getColor( prefix + "focusedBackground" );
+			focusedForeground = UIManager.getColor( prefix + "focusedForeground" );
 			hoverBackground = UIManager.getColor( prefix + "hoverBackground" );
+			hoverForeground = UIManager.getColor( prefix + "hoverForeground" );
 			pressedBackground = UIManager.getColor( prefix + "pressedBackground" );
+			pressedForeground = UIManager.getColor( prefix + "pressedForeground" );
 			selectedBackground = UIManager.getColor( prefix + "selectedBackground" );
 			selectedForeground = UIManager.getColor( prefix + "selectedForeground" );
 			disabledBackground = UIManager.getColor( prefix + "disabledBackground" );
 			disabledText = UIManager.getColor( prefix + "disabledText" );
 			disabledSelectedBackground = UIManager.getColor( prefix + "disabledSelectedBackground" );
-
-			if( UIManager.getBoolean( "Button.paintShadow" ) ) {
-				shadowWidth = FlatUIUtils.getUIInt( "Button.shadowWidth", 2 );
-				shadowColor = UIManager.getColor( "Button.shadowColor" );
-				defaultShadowColor = UIManager.getColor( "Button.default.shadowColor" );
-			} else {
-				shadowWidth = 0;
-				shadowColor = null;
-				defaultShadowColor = null;
-			}
+			disabledSelectedForeground = UIManager.getColor( prefix + "disabledSelectedForeground" );
 
 			defaultBackground = FlatUIUtils.getUIColor( "Button.default.startBackground", "Button.default.background" );
 			defaultEndBackground = UIManager.getColor( "Button.default.endBackground" );
 			defaultForeground = UIManager.getColor( "Button.default.foreground" );
 			defaultFocusedBackground = UIManager.getColor( "Button.default.focusedBackground" );
+			defaultFocusedForeground = UIManager.getColor( "Button.default.focusedForeground" );
 			defaultHoverBackground = UIManager.getColor( "Button.default.hoverBackground" );
+			defaultHoverForeground = UIManager.getColor( "Button.default.hoverForeground" );
 			defaultPressedBackground = UIManager.getColor( "Button.default.pressedBackground" );
+			defaultPressedForeground = UIManager.getColor( "Button.default.pressedForeground" );
 			defaultBoldText = UIManager.getBoolean( "Button.default.boldText" );
 
-			toolbarSpacingInsets = UIManager.getInsets( "Button.toolbar.spacingInsets" );
+			paintShadow = UIManager.getBoolean( "Button.paintShadow" );
+			shadowWidth = FlatUIUtils.getUIInt( "Button.shadowWidth", 2 );
+			shadowColor = UIManager.getColor( "Button.shadowColor" );
+			defaultShadowColor = UIManager.getColor( "Button.default.shadowColor" );
+
 			toolbarHoverBackground = UIManager.getColor( prefix + "toolbar.hoverBackground" );
+			toolbarHoverForeground = UIManager.getColor( prefix + "toolbar.hoverForeground" );
 			toolbarPressedBackground = UIManager.getColor( prefix + "toolbar.pressedBackground" );
+			toolbarPressedForeground = UIManager.getColor( prefix + "toolbar.pressedForeground" );
 			toolbarSelectedBackground = UIManager.getColor( prefix + "toolbar.selectedBackground" );
+			toolbarSelectedForeground = UIManager.getColor( prefix + "toolbar.selectedForeground" );
+			toolbarDisabledSelectedBackground = UIManager.getColor( prefix + "toolbar.disabledSelectedBackground" );
+			toolbarDisabledSelectedForeground = UIManager.getColor( prefix + "toolbar.disabledSelectedForeground" );
 
 			helpButtonIcon = UIManager.getIcon( "HelpButton.icon" );
+			defaultMargin = UIManager.getInsets( prefix + "margin" );
 
+			helpButtonIconShared = true;
 			defaults_initialized = true;
 		}
 
@@ -204,6 +281,9 @@ public class FlatButtonUI
 	protected void uninstallDefaults( AbstractButton b ) {
 		super.uninstallDefaults( b );
 
+		oldStyleValues = null;
+		borderShared = null;
+
 		MigLayoutVisualPadding.uninstall( b );
 		defaults_initialized = false;
 	}
@@ -225,9 +305,86 @@ public class FlatButtonUI
 				b.revalidate();
 				b.repaint();
 				break;
+
+			case OUTLINE:
+				b.repaint();
+				break;
+
+			case STYLE:
+			case STYLE_CLASS:
+				if( shared && FlatStylingSupport.hasStyleProperty( b ) ) {
+					// unshare component UI if necessary
+					// updateUI() invokes installStyle() from installUI()
+					b.updateUI();
+				} else
+					installStyle( b );
+				b.revalidate();
+				b.repaint();
+				break;
 		}
 	}
 
+	/** @since 2 */
+	protected void installStyle( AbstractButton b ) {
+		try {
+			applyStyle( b, FlatStylingSupport.getResolvedStyle( b, getStyleType() ) );
+		} catch( RuntimeException ex ) {
+			LoggingFacade.INSTANCE.logSevere( null, ex );
+		}
+	}
+
+	/** @since 2 */
+	String getStyleType() {
+		return "Button";
+	}
+
+	/** @since 2 */
+	protected void applyStyle( AbstractButton b, Object style ) {
+		oldStyleValues = FlatStylingSupport.parseAndApply( oldStyleValues, style,
+			(key, value) -> applyStyleProperty( b, key, value ) );
+	}
+
+	/** @since 2 */
+	protected Object applyStyleProperty( AbstractButton b, String key, Object value ) {
+		if( key.startsWith( "help." ) ) {
+			if( !(helpButtonIcon instanceof FlatHelpButtonIcon) )
+				return new UnknownStyleException( key );
+
+			if( helpButtonIconShared ) {
+				helpButtonIcon = FlatStylingSupport.cloneIcon( helpButtonIcon );
+				helpButtonIconShared = false;
+			}
+
+			key = key.substring( "help.".length() );
+			return ((FlatHelpButtonIcon)helpButtonIcon).applyStyleProperty( key, value );
+		}
+
+		if( borderShared == null )
+			borderShared = new AtomicBoolean( true );
+		return FlatStylingSupport.applyToAnnotatedObjectOrBorder( this, key, value, b, borderShared );
+	}
+
+	/** @since 2 */
+	@Override
+	public Map<String, Class<?>> getStyleableInfos( JComponent c ) {
+		Map<String, Class<?>> infos = FlatStylingSupport.getAnnotatedStyleableInfos( this, c.getBorder() );
+		if( helpButtonIcon instanceof FlatHelpButtonIcon )
+			FlatStylingSupport.putAllPrefixKey( infos, "help.", ((FlatHelpButtonIcon)helpButtonIcon).getStyleableInfos() );
+		return infos;
+	}
+
+	/** @since 2.5 */
+	@Override
+	public Object getStyleableValue( JComponent c, String key ) {
+		if( key.startsWith( "help." ) ) {
+			return (helpButtonIcon instanceof FlatHelpButtonIcon)
+				? ((FlatHelpButtonIcon)helpButtonIcon).getStyleableValue( key.substring( "help.".length() ) )
+				: null;
+		}
+
+		return FlatStylingSupport.getAnnotatedStyleableValue( this, c.getBorder(), key );
+	}
+
 	static boolean isContentAreaFilled( Component c ) {
 		return !(c instanceof AbstractButton) || ((AbstractButton)c).isContentAreaFilled();
 	}
@@ -242,7 +399,7 @@ public class FlatButtonUI
 
 	/**
 	 * Returns true if the button has an icon but no text,
-	 * or it it does not have an icon and the text is either "..." or one character.
+	 * or it does not have an icon and the text is either "..." or one character.
 	 */
 	static boolean isIconOnlyOrSingleCharacterButton( Component c ) {
 		if( !(c instanceof JButton) && !(c instanceof JToggleButton) )
@@ -265,11 +422,11 @@ public class FlatButtonUI
 		if( !(c instanceof AbstractButton) )
 			return TYPE_OTHER;
 
-		Object value = ((AbstractButton)c).getClientProperty( BUTTON_TYPE );
-		if( !(value instanceof String) )
+		String value = getButtonTypeStr( (AbstractButton) c );
+		if( value == null )
 			return TYPE_OTHER;
 
-		switch( (String) value ) {
+		switch( value ) {
 			case BUTTON_TYPE_SQUARE:		return TYPE_SQUARE;
 			case BUTTON_TYPE_ROUND_RECT:	return TYPE_ROUND_RECT;
 			default:						return TYPE_OTHER;
@@ -277,12 +434,27 @@ public class FlatButtonUI
 	}
 
 	static boolean isHelpButton( Component c ) {
-		return c instanceof JButton && clientPropertyEquals( (JButton) c, BUTTON_TYPE, BUTTON_TYPE_HELP );
+		return c instanceof JButton && BUTTON_TYPE_HELP.equals( getButtonTypeStr( (JButton) c ) );
 	}
 
 	static boolean isToolBarButton( Component c ) {
 		return c.getParent() instanceof JToolBar ||
-			(c instanceof AbstractButton && clientPropertyEquals( (AbstractButton) c, BUTTON_TYPE, BUTTON_TYPE_TOOLBAR_BUTTON ));
+			(c instanceof AbstractButton && BUTTON_TYPE_TOOLBAR_BUTTON.equals( getButtonTypeStr( (AbstractButton) c ) ));
+	}
+
+	static boolean isBorderlessButton( Component c ) {
+		return c instanceof AbstractButton && BUTTON_TYPE_BORDERLESS.equals( getButtonTypeStr( (AbstractButton) c ) );
+	}
+
+	static String getButtonTypeStr( AbstractButton c ) {
+		// get from client property
+		Object value = c.getClientProperty( BUTTON_TYPE );
+		if( value instanceof String )
+			return (String) value;
+
+		// get from styling property
+		ButtonUI ui = c.getUI();
+		return (ui instanceof FlatButtonUI) ? ((FlatButtonUI)ui).buttonType : null;
 	}
 
 	@Override
@@ -311,29 +483,48 @@ public class FlatButtonUI
 		try {
 			FlatUIUtils.setRenderingHints( g2 );
 
+			boolean def = isDefaultButton( c );
 			boolean isToolBarButton = isToolBarButton( c );
 			float focusWidth = isToolBarButton ? 0 : FlatUIUtils.getBorderFocusWidth( c );
 			float arc = FlatUIUtils.getBorderArc( c );
+			float textFieldArc = 0;
 
-			boolean def = isDefaultButton( c );
+			// if toolbar button is in leading/trailing component of a text field,
+			// increase toolbar button arc to match text field arc (if necessary)
+			if( isToolBarButton &&
+				FlatClientProperties.clientProperty( c, STYLE_CLASS, "", String.class ).contains( "inTextField" ) )
+			{
+				JTextField textField = (JTextField) SwingUtilities.getAncestorOfClass( JTextField.class, c );
+				if( textField != null )
+					textFieldArc = FlatUIUtils.getBorderArc( textField );
+			}
 
 			int x = 0;
 			int y = 0;
 			int width = c.getWidth();
 			int height = c.getHeight();
 
-			if( isToolBarButton ) {
-				Insets spacing = UIScale.scale( toolbarSpacingInsets );
+			if( isToolBarButton && c.getBorder() instanceof FlatButtonBorder ) {
+				Insets spacing = UIScale.scale( ((FlatButtonBorder)c.getBorder()).toolbarSpacingInsets );
 				x += spacing.left;
 				y += spacing.top;
 				width -= spacing.left + spacing.right;
 				height -= spacing.top + spacing.bottom;
+
+				// reduce text field arc
+				textFieldArc -= spacing.top + spacing.bottom;
 			}
 
+			// increase toolbar button arc to match text field arc (if necessary)
+			if( arc < textFieldArc )
+				arc = textFieldArc;
+
 			// paint shadow
 			Color shadowColor = def ? defaultShadowColor : this.shadowColor;
-			if( !isToolBarButton && shadowColor != null && shadowWidth > 0 && focusWidth > 0 &&
-				!(isFocusPainted( c ) && FlatUIUtils.isPermanentFocusOwner( c )) && c.isEnabled() )
+			if( paintShadow &&
+				shadowColor != null && shadowWidth > 0 && focusWidth > 0 && c.isEnabled() &&
+				!isToolBarButton && !isBorderlessButton( c ) &&
+				!(isFocusPainted( c ) && FlatUIUtils.isPermanentFocusOwner( c )) )
 			{
 				g2.setColor( shadowColor );
 				g2.fill( new RoundRectangle2D.Float( focusWidth, focusWidth + UIScale.scale( (float) shadowWidth ),
@@ -359,6 +550,23 @@ public class FlatButtonUI
 		super.paint( FlatLabelUI.createGraphicsHTMLTextYCorrection( g, c ), c );
 	}
 
+	@Override
+	protected void paintIcon( Graphics g, JComponent c, Rectangle iconRect ) {
+		// correct icon location when using bold font for default button
+		int xOffset = defaultBoldPlainWidthDiff( c ) / 2;
+		if( xOffset > 0 ) {
+			boolean ltr = c.getComponentOrientation().isLeftToRight();
+			switch( ((AbstractButton)c).getHorizontalTextPosition() ) {
+				case SwingConstants.RIGHT:    iconRect.x -= xOffset; break;
+				case SwingConstants.LEFT:     iconRect.x += xOffset; break;
+				case SwingConstants.TRAILING: iconRect.x -= ltr ? xOffset : -xOffset; break;
+				case SwingConstants.LEADING:  iconRect.x += ltr ? xOffset : -xOffset; break;
+			}
+		}
+
+		super.paintIcon( g, c, iconRect );
+	}
+
 	@Override
 	protected void paintText( Graphics g, AbstractButton b, Rectangle textRect, String text ) {
 		if( isHelpButton( b ) )
@@ -379,6 +587,8 @@ public class FlatButtonUI
 	}
 
 	public static void paintText( Graphics g, AbstractButton b, Rectangle textRect, String text, Color foreground ) {
+		if(foreground == null)
+			foreground=Color.red;
 		FontMetrics fm = b.getFontMetrics( b.getFont() );
 		int mnemonicIndex = FlatLaf.isShowMnemonics() ? b.getDisplayedMnemonicIndex() : -1;
 
@@ -388,47 +598,47 @@ public class FlatButtonUI
 	}
 
 	protected Color getBackground( JComponent c ) {
+		boolean toolBarButton = isToolBarButton( c ) || isBorderlessButton( c );
+
+		// selected state
 		if( ((AbstractButton)c).isSelected() ) {
-			// in toolbar use same colors for disabled and enabled because
+			// in toolbar, if toolbarDisabledSelectedBackground is null,
+			// use same background colors for disabled and enabled because
 			// we assume that toolbar icon is shown disabled
-			boolean toolBarButton = isToolBarButton( c );
 			return buttonStateColor( c,
 				toolBarButton ? toolbarSelectedBackground : selectedBackground,
-				toolBarButton ? toolbarSelectedBackground : disabledSelectedBackground,
-				null, null,
+				toolBarButton
+					? (toolbarDisabledSelectedBackground != null ? toolbarDisabledSelectedBackground : toolbarSelectedBackground)
+					: disabledSelectedBackground,
+				null,
+				null,
 				toolBarButton ? toolbarPressedBackground : pressedBackground );
 		}
 
-		if( !c.isEnabled() )
-			return disabledBackground;
-
 		// toolbar button
-		if( isToolBarButton( c ) ) {
-			ButtonModel model = ((AbstractButton)c).getModel();
-			if( model.isPressed() )
-				return toolbarPressedBackground;
-			if( model.isRollover() )
-				return toolbarHoverBackground;
-
-			// use component background if explicitly set
+		if( toolBarButton ) {
 			Color bg = c.getBackground();
-			if( isCustomBackground( bg ) )
-				return bg;
-
-			// do not paint background
-			return null;
+			return buttonStateColor( c,
+				isCustomBackground( bg ) ? bg : null,
+				null,
+				null,
+				toolbarHoverBackground,
+				toolbarPressedBackground );
 		}
 
 		boolean def = isDefaultButton( c );
 		return buttonStateColor( c,
 			getBackgroundBase( c, def ),
-			null,
+			disabledBackground,
 			isCustomBackground( c.getBackground() ) ? null : (def ? defaultFocusedBackground : focusedBackground),
 			def ? defaultHoverBackground : hoverBackground,
 			def ? defaultPressedBackground : pressedBackground );
 	}
 
 	protected Color getBackgroundBase( JComponent c, boolean def ) {
+		if( FlatUIUtils.isAWTPeer( c ) )
+			return background;
+
 		// use component background if explicitly set
 		Color bg = c.getBackground();
 		if( isCustomBackground( bg ) )
@@ -444,16 +654,21 @@ public class FlatButtonUI
 	public static Color buttonStateColor( Component c, Color enabledColor, Color disabledColor,
 		Color focusedColor, Color hoverColor, Color pressedColor )
 	{
-		AbstractButton b = (c instanceof AbstractButton) ? (AbstractButton) c : null;
+		if( c == null )
+			return enabledColor;
 
 		if( !c.isEnabled() )
 			return disabledColor;
 
-		if( pressedColor != null && b != null && b.getModel().isPressed() )
-			return pressedColor;
+		if( c instanceof AbstractButton ) {
+			ButtonModel model = ((AbstractButton)c).getModel();
 
-		if( hoverColor != null && b != null && b.getModel().isRollover() )
-			return hoverColor;
+			if( pressedColor != null && model.isPressed() )
+				return pressedColor;
+
+			if( hoverColor != null && model.isRollover() )
+				return hoverColor;
+		}
 
 		if( focusedColor != null && isFocusPainted( c ) && FlatUIUtils.isPermanentFocusOwner( c ) )
 			return focusedColor;
@@ -462,18 +677,48 @@ public class FlatButtonUI
 	}
 
 	protected Color getForeground( JComponent c ) {
-		if( !c.isEnabled() )
-			return disabledText;
+		boolean toolBarButton = isToolBarButton( c ) || isBorderlessButton( c );
 
-		if( ((AbstractButton)c).isSelected() && !isToolBarButton( c ) )
-			return selectedForeground;
+		// selected state
+		if( ((AbstractButton)c).isSelected() ) {
+			return buttonStateColor( c,
+				toolBarButton
+					? (toolbarSelectedForeground != null ? toolbarSelectedForeground : c.getForeground())
+					: selectedForeground,
+				toolBarButton
+					? (toolbarDisabledSelectedForeground != null ? toolbarDisabledSelectedForeground : disabledText)
+					: (disabledSelectedForeground != null ? disabledSelectedForeground : disabledText),
+				null,
+				null,
+				toolBarButton ? toolbarPressedForeground : pressedForeground );
+		}
 
+		// toolbar button
+		if( toolBarButton ) {
+			return buttonStateColor( c,
+				c.getForeground(),
+				disabledText,
+				null,
+				toolbarHoverForeground,
+				toolbarPressedForeground );
+		}
+
+		boolean def = isDefaultButton( c );
+		return buttonStateColor( c,
+			getForegroundBase( c, def ),
+			disabledText,
+			isCustomForeground( c.getForeground() ) ? null : (def ? defaultFocusedForeground : focusedForeground),
+			def ? defaultHoverForeground : hoverForeground,
+			def ? defaultPressedForeground : pressedForeground );
+	}
+
+	/** @since 2.3 */
+	protected Color getForegroundBase( JComponent c, boolean def ) {
 		// use component foreground if explicitly set
 		Color fg = c.getForeground();
 		if( isCustomForeground( fg ) )
 			return fg;
 
-		boolean def = isDefaultButton( c );
 		return def ? defaultForeground : fg;
 	}
 
@@ -490,24 +735,51 @@ public class FlatButtonUI
 		if( prefSize == null )
 			return null;
 
+		// increase width when using bold font for default button
+		prefSize.width += defaultBoldPlainWidthDiff( c );
+
 		// make square or apply minimum width/height
 		boolean isIconOnlyOrSingleCharacter = isIconOnlyOrSingleCharacterButton( c );
-		if( clientPropertyBoolean( c, SQUARE_SIZE, false ) ) {
+		if( clientPropertyBoolean( c, SQUARE_SIZE, squareSize ) ) {
 			// make button square (increase width or height so that they are equal)
 			prefSize.width = prefSize.height = Math.max( prefSize.width, prefSize.height );
 		} else if( isIconOnlyOrSingleCharacter && ((AbstractButton)c).getIcon() == null ) {
 			// make single-character-no-icon button square (increase width)
 			prefSize.width = Math.max( prefSize.width, prefSize.height );
-		} else if( !isIconOnlyOrSingleCharacter && !isToolBarButton( c ) && c.getBorder() instanceof FlatButtonBorder ) {
+		} else if( !isIconOnlyOrSingleCharacter && !isToolBarButton( c ) &&
+			c.getBorder() instanceof FlatButtonBorder && hasDefaultMargins( c ) )
+		{
 			// apply minimum width/height
-			float focusWidth = FlatUIUtils.getBorderFocusWidth( c );
-			prefSize.width = Math.max( prefSize.width, scale( FlatUIUtils.minimumWidth( c, minimumWidth ) ) + Math.round( focusWidth * 2 ) );
-			prefSize.height = Math.max( prefSize.height, scale( FlatUIUtils.minimumHeight( c, 0 ) ) + Math.round( focusWidth * 2 ) );
+			int fw = Math.round( FlatUIUtils.getBorderFocusWidth( c ) * 2 );
+			prefSize.width = Math.max( prefSize.width, scale( FlatUIUtils.minimumWidth( c, minimumWidth ) ) + fw );
+			prefSize.height = Math.max( prefSize.height, scale( FlatUIUtils.minimumHeight( c, minimumHeight ) ) + fw );
 		}
 
 		return prefSize;
 	}
 
+	private int defaultBoldPlainWidthDiff( JComponent c ) {
+		if( defaultBoldText && isDefaultButton( c ) && c.getFont() instanceof UIResource ) {
+			String text = ((AbstractButton)c).getText();
+			if( text == null || text.isEmpty() )
+				return 0;
+
+			Font font = c.getFont();
+			Font boldFont = font.deriveFont( Font.BOLD );
+			int boldWidth = c.getFontMetrics( boldFont ).stringWidth( text );
+			int plainWidth = c.getFontMetrics( font ).stringWidth( text );
+			if( boldWidth > plainWidth )
+				return boldWidth - plainWidth;
+		}
+
+		return 0;
+	}
+
+	private boolean hasDefaultMargins( JComponent c ) {
+		Insets margin = ((AbstractButton)c).getMargin();
+		return margin instanceof UIResource && Objects.equals( margin, defaultMargin );
+	}
+
 	//---- class FlatButtonListener -------------------------------------------
 
 	protected class FlatButtonListener

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatCaret.java

@@ -18,16 +18,27 @@ package com.formdev.flatlaf.ui;
 
 import static com.formdev.flatlaf.FlatClientProperties.*;
 import java.awt.EventQueue;
+import java.awt.Rectangle;
+import java.awt.event.ActionEvent;
 import java.awt.event.FocusEvent;
 import java.awt.event.MouseEvent;
+import javax.swing.Action;
+import javax.swing.ActionMap;
 import javax.swing.JFormattedTextField;
+import javax.swing.SwingUtilities;
+import javax.swing.UIManager;
 import javax.swing.plaf.UIResource;
+import javax.swing.text.BadLocationException;
 import javax.swing.text.DefaultCaret;
+import javax.swing.text.DefaultEditorKit;
 import javax.swing.text.Document;
 import javax.swing.text.JTextComponent;
+import javax.swing.text.Utilities;
 
 /**
  * Caret that can select all text on focus gained.
+ * Also fixes Swing's double-click-and-drag behavior so that dragging after
+ * a double-click extends selection by whole words.
  *
  * @author Karl Tauber
  */
@@ -35,12 +46,19 @@ public class FlatCaret
 	extends DefaultCaret
 	implements UIResource
 {
+	private static final String KEY_CARET_INFO = "FlatLaf.internal.caretInfo";
+
 	private final String selectAllOnFocusPolicy;
 	private final boolean selectAllOnMouseClick;
 
+	private boolean inInstall;
 	private boolean wasFocused;
 	private boolean wasTemporaryLost;
 	private boolean isMousePressed;
+	private boolean isWordSelection;
+	private boolean isLineSelection;
+	private int dragSelectionStart;
+	private int dragSelectionEnd;
 
 	public FlatCaret( String selectAllOnFocusPolicy, boolean selectAllOnMouseClick ) {
 		this.selectAllOnFocusPolicy = selectAllOnFocusPolicy;
@@ -49,21 +67,82 @@ public class FlatCaret
 
 	@Override
 	public void install( JTextComponent c ) {
-		super.install( c );
+		// get caret info if switched theme
+		long[] ci = (long[]) c.getClientProperty( KEY_CARET_INFO );
+		if( ci != null ) {
+			c.putClientProperty( KEY_CARET_INFO, null );
 
-		// the dot and mark are lost when switching LaF
-		// --> move dot to end of text so that all text may be selected when it gains focus
-		Document doc = c.getDocument();
-		if( doc != null && getDot() == 0 && getMark() == 0 ) {
-			int length = doc.getLength();
-			if( length > 0 )
-				setDot( length );
+			// if caret info is too old assume that switched from FlatLaf
+			// to another Laf and back to FlatLaf
+			if( System.currentTimeMillis() - 500 > ci[3] )
+				ci = null;
+		}
+		if( ci != null ) {
+			// when switching theme, it is necessary to set blink rate before
+			// invoking super.install() otherwise the caret does not blink
+			setBlinkRate( (int) ci[2] );
+		}
+
+		inInstall = true;
+		try {
+			super.install( c );
+		} finally {
+			inInstall = false;
+		}
+
+		if( ci != null ) {
+			// restore selection
+			select( (int) ci[1], (int) ci[0] );
+
+			// if text component is focused, then caret and selection are visible,
+			// but when switching theme, the component does not yet have
+			// a highlighter and the selection is not painted
+			// --> make selection temporary invisible later, then the caret
+			//     adds selection highlights to the text component highlighter
+			if( isSelectionVisible() ) {
+				EventQueue.invokeLater( () -> {
+					if( getComponent() == null )
+						return; // was deinstalled
+
+					if( isSelectionVisible() ) {
+						setSelectionVisible( false );
+						setSelectionVisible( true );
+					}
+				} );
+			}
 		}
 	}
 
+	@Override
+	public void deinstall( JTextComponent c ) {
+		// remember dot and mark (the selection) when switching theme
+		c.putClientProperty( KEY_CARET_INFO, new long[] {
+			getDot(),
+			getMark(),
+			getBlinkRate(),
+			System.currentTimeMillis(),
+		} );
+
+		super.deinstall( c );
+	}
+
+	@Override
+	protected void adjustVisibility( Rectangle nloc ) {
+		JTextComponent c = getComponent();
+		if( c != null && c.getUI() instanceof FlatTextFieldUI ) {
+			// need to fix x location because JTextField.scrollRectToVisible() uses insets.left
+			// (as BasicTextUI.getVisibleEditorRect() does),
+			// but FlatTextFieldUI.getVisibleEditorRect() may add some padding
+			Rectangle r = ((FlatTextFieldUI)c.getUI()).getVisibleEditorRect();
+			if( r != null )
+				nloc.x -= r.x - c.getInsets().left;
+		}
+		super.adjustVisibility( nloc );
+	}
+
 	@Override
 	public void focusGained( FocusEvent e ) {
-		if( !wasTemporaryLost && (!isMousePressed || selectAllOnMouseClick) )
+		if( !inInstall && !wasTemporaryLost && (!isMousePressed || selectAllOnMouseClick) )
 			selectAllOnFocusGained();
 		wasTemporaryLost = false;
 		wasFocused = true;
@@ -81,25 +160,83 @@ public class FlatCaret
 	public void mousePressed( MouseEvent e ) {
 		isMousePressed = true;
 		super.mousePressed( e );
+
+		JTextComponent c = getComponent();
+
+		// left double-click starts word selection
+		isWordSelection = e.getClickCount() == 2 && SwingUtilities.isLeftMouseButton( e ) && !e.isConsumed();
+
+		// left triple-click starts line selection
+		isLineSelection = e.getClickCount() == 3 && SwingUtilities.isLeftMouseButton( e ) && (!e.isConsumed() || c.getDragEnabled());
+
+		// select line
+		// (this is also done in DefaultCaret.mouseClicked(), but this event is
+		// sent when the mouse is released, which is too late for triple-click-and-drag)
+		if( isLineSelection ) {
+			ActionMap actionMap = c.getActionMap();
+			Action selectLineAction = (actionMap != null)
+				? actionMap.get( DefaultEditorKit.selectLineAction )
+				: null;
+			if( selectLineAction != null ) {
+				selectLineAction.actionPerformed( new ActionEvent( c,
+					ActionEvent.ACTION_PERFORMED, null, e.getWhen(), e.getModifiers() ) );
+			}
+		}
+
+		// remember selection where word/line selection starts to keep it always selected while dragging
+		if( isWordSelection || isLineSelection ) {
+			int mark = getMark();
+			int dot = getDot();
+			dragSelectionStart = Math.min( dot, mark );
+			dragSelectionEnd = Math.max( dot, mark );
+		}
 	}
 
 	@Override
 	public void mouseReleased( MouseEvent e ) {
 		isMousePressed = false;
+		isWordSelection = false;
+		isLineSelection = false;
 		super.mouseReleased( e );
 	}
 
+	@Override
+	public void mouseDragged( MouseEvent e ) {
+		if( (isWordSelection || isLineSelection) &&
+			!e.isConsumed() && SwingUtilities.isLeftMouseButton( e ) )
+		{
+			// fix Swing's double/triple-click-and-drag behavior so that dragging after
+			// a double/triple-click extends selection by whole words/lines
+			JTextComponent c = getComponent();
+			int pos = c.viewToModel( e.getPoint() );
+			if( pos < 0 )
+				return;
+
+			try {
+				if( pos > dragSelectionEnd )
+					select( dragSelectionStart, isWordSelection ? Utilities.getWordEnd( c, pos ) : Utilities.getRowEnd( c, pos ) );
+				else if( pos < dragSelectionStart )
+					select( dragSelectionEnd, isWordSelection ? Utilities.getWordStart( c, pos ) : Utilities.getRowStart( c, pos ) );
+				else
+					select( dragSelectionStart, dragSelectionEnd );
+			} catch( BadLocationException ex ) {
+				UIManager.getLookAndFeel().provideErrorFeedback( c );
+			}
+		} else
+			super.mouseDragged( e );
+	}
+
 	protected void selectAllOnFocusGained() {
 		JTextComponent c = getComponent();
 		Document doc = c.getDocument();
-		if( doc == null || !c.isEnabled() || !c.isEditable() )
+		if( doc == null || !c.isEnabled() || !c.isEditable() || FlatUIUtils.isCellEditor( c ) )
 			return;
 
 		Object selectAllOnFocusPolicy = c.getClientProperty( SELECT_ALL_ON_FOCUS_POLICY );
 		if( selectAllOnFocusPolicy == null )
 			selectAllOnFocusPolicy = this.selectAllOnFocusPolicy;
 
-		if( SELECT_ALL_ON_FOCUS_POLICY_NEVER.equals( selectAllOnFocusPolicy ) )
+		if( selectAllOnFocusPolicy == null || SELECT_ALL_ON_FOCUS_POLICY_NEVER.equals( selectAllOnFocusPolicy ) )
 			return;
 
 		if( !SELECT_ALL_ON_FOCUS_POLICY_ALWAYS.equals( selectAllOnFocusPolicy ) ) {
@@ -119,12 +256,37 @@ public class FlatCaret
 		// select all
 		if( c instanceof JFormattedTextField ) {
 			EventQueue.invokeLater( () -> {
-				setDot( 0 );
-				moveDot( doc.getLength() );
+				if( getComponent() == null )
+					return; // was deinstalled
+
+				select( 0, doc.getLength() );
 			} );
 		} else {
-			setDot( 0 );
-			moveDot( doc.getLength() );
+			select( 0, doc.getLength() );
+		}
+	}
+
+	private void select( int mark, int dot ) {
+		if( mark != getMark() )
+			setDot( mark );
+		if( dot != getDot() )
+			moveDot( dot );
+	}
+
+	/** @since 1.4 */
+	public void scrollCaretToVisible() {
+		JTextComponent c = getComponent();
+		if( c == null || c.getUI() == null )
+			return;
+
+		try {
+			Rectangle loc = c.getUI().modelToView( c, getDot(), getDotBias() );
+			if( loc != null ) {
+				adjustVisibility( loc );
+				damage( loc );
+			}
+		} catch( BadLocationException ex ) {
+			// ignore
 		}
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatCheckBoxMenuItemUI.java

@@ -18,11 +18,19 @@ package com.formdev.flatlaf.ui;
 
 import java.awt.Dimension;
 import java.awt.Graphics;
+import java.beans.PropertyChangeListener;
+import java.lang.invoke.MethodHandles;
+import java.util.Map;
 import javax.swing.Icon;
 import javax.swing.JComponent;
 import javax.swing.LookAndFeel;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicCheckBoxMenuItemUI;
+import javax.swing.plaf.basic.BasicMenuItemUI;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableField;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableLookupProvider;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableUI;
+import com.formdev.flatlaf.util.LoggingFacade;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JCheckBoxMenuItem}.
@@ -52,15 +60,30 @@ import javax.swing.plaf.basic.BasicCheckBoxMenuItemUI;
  *
  * @author Karl Tauber
  */
+@StyleableField( cls=BasicMenuItemUI.class, key="selectionBackground" )
+@StyleableField( cls=BasicMenuItemUI.class, key="selectionForeground" )
+@StyleableField( cls=BasicMenuItemUI.class, key="disabledForeground" )
+@StyleableField( cls=BasicMenuItemUI.class, key="acceleratorForeground" )
+@StyleableField( cls=BasicMenuItemUI.class, key="acceleratorSelectionForeground" )
+
 public class FlatCheckBoxMenuItemUI
 	extends BasicCheckBoxMenuItemUI
+	implements StyleableUI, StyleableLookupProvider
 {
 	private FlatMenuItemRenderer renderer;
+	private Map<String, Object> oldStyleValues;
 
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatCheckBoxMenuItemUI();
 	}
 
+	@Override
+	public void installUI( JComponent c ) {
+		super.installUI( c );
+
+		installStyle();
+	}
+
 	@Override
 	protected void installDefaults() {
 		super.installDefaults();
@@ -74,13 +97,59 @@ public class FlatCheckBoxMenuItemUI
 	protected void uninstallDefaults() {
 		super.uninstallDefaults();
 
+		FlatMenuItemRenderer.clearClientProperties( menuItem.getParent() );
 		renderer = null;
+		oldStyleValues = null;
 	}
 
 	protected FlatMenuItemRenderer createRenderer() {
 		return new FlatMenuItemRenderer( menuItem, checkIcon, arrowIcon, acceleratorFont, acceleratorDelimiter );
 	}
 
+	@Override
+	protected PropertyChangeListener createPropertyChangeListener( JComponent c ) {
+		return FlatStylingSupport.createPropertyChangeListener( c, this::installStyle, super.createPropertyChangeListener( c ) );
+	}
+
+	/** @since 2 */
+	protected void installStyle() {
+		try {
+			applyStyle( FlatStylingSupport.getResolvedStyle( menuItem, "CheckBoxMenuItem" ) );
+		} catch( RuntimeException ex ) {
+			LoggingFacade.INSTANCE.logSevere( null, ex );
+		}
+	}
+
+	/** @since 2 */
+	protected void applyStyle( Object style ) {
+		oldStyleValues = FlatStylingSupport.parseAndApply( oldStyleValues, style, this::applyStyleProperty );
+	}
+
+	/** @since 2 */
+	protected Object applyStyleProperty( String key, Object value ) {
+		return FlatMenuItemUI.applyStyleProperty( menuItem, this, renderer, key, value );
+	}
+
+	/** @since 2 */
+	@Override
+	public Map<String, Class<?>> getStyleableInfos( JComponent c ) {
+		return FlatMenuItemUI.getStyleableInfos( this, renderer );
+	}
+
+	/** @since 2.5 */
+	@Override
+	public Object getStyleableValue( JComponent c, String key ) {
+		return FlatMenuItemUI.getStyleableValue( this, renderer, key );
+	}
+
+	/** @since 2.5 */
+	@Override
+	public MethodHandles.Lookup getLookupForStyling() {
+		// MethodHandles.lookup() is caller sensitive and must be invoked in this class,
+		// otherwise it is not possible to access protected fields in JRE superclass
+		return MethodHandles.lookup();
+	}
+
 	@Override
 	protected Dimension getPreferredMenuItemSize( JComponent c, Icon checkIcon, Icon arrowIcon, int defaultTextIconGap ) {
 		return renderer.getPreferredMenuItemSize();

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatCheckBoxUI.java

@@ -43,11 +43,24 @@ public class FlatCheckBoxUI
 	extends FlatRadioButtonUI
 {
 	public static ComponentUI createUI( JComponent c ) {
-		return FlatUIUtils.createSharedUI( FlatCheckBoxUI.class, FlatCheckBoxUI::new );
+		return FlatUIUtils.canUseSharedUI( c ) && !FlatUIUtils.needsLightAWTPeer( c )
+			? FlatUIUtils.createSharedUI( FlatCheckBoxUI.class, () -> new FlatCheckBoxUI( true ) )
+			: new FlatCheckBoxUI( false );
+	}
+
+	/** @since 2 */
+	protected FlatCheckBoxUI( boolean shared ) {
+		super( shared );
 	}
 
 	@Override
 	public String getPropertyPrefix() {
 		return "CheckBox.";
 	}
+
+	/** @since 2 */
+	@Override
+	String getStyleType() {
+		return "CheckBox";
+	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatComboBoxUI.java

@@ -16,12 +16,15 @@
 
 package com.formdev.flatlaf.ui;
 
+import static com.formdev.flatlaf.FlatClientProperties.*;
 import static com.formdev.flatlaf.util.UIScale.scale;
+import static com.formdev.flatlaf.util.UIScale.unscale;
 import java.awt.Color;
 import java.awt.Component;
 import java.awt.ComponentOrientation;
 import java.awt.Container;
 import java.awt.Dimension;
+import java.awt.FontMetrics;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
 import java.awt.GraphicsConfiguration;
@@ -39,10 +42,12 @@ import java.awt.event.MouseEvent;
 import java.awt.event.MouseListener;
 import java.awt.geom.Rectangle2D;
 import java.beans.PropertyChangeListener;
-import java.lang.ref.WeakReference;
+import java.lang.invoke.MethodHandles;
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicBoolean;
 import javax.swing.AbstractAction;
 import javax.swing.BorderFactory;
-import javax.swing.ComboBoxEditor;
+import javax.swing.CellRendererPane;
 import javax.swing.DefaultListCellRenderer;
 import javax.swing.InputMap;
 import javax.swing.JButton;
@@ -60,13 +65,17 @@ import javax.swing.UIManager;
 import javax.swing.border.AbstractBorder;
 import javax.swing.border.Border;
 import javax.swing.plaf.ComponentUI;
+import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicComboBoxUI;
 import javax.swing.plaf.basic.BasicComboPopup;
 import javax.swing.plaf.basic.ComboPopup;
 import javax.swing.text.JTextComponent;
-import com.formdev.flatlaf.FlatClientProperties;
+import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableField;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableLookupProvider;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableUI;
+import com.formdev.flatlaf.util.LoggingFacade;
 import com.formdev.flatlaf.util.SystemInfo;
-import com.formdev.flatlaf.util.UIScale;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JComboBox}.
@@ -80,6 +89,11 @@ import com.formdev.flatlaf.util.UIScale;
  * @uiDefault ComboBox.padding					Insets
  * @uiDefault ComboBox.squareButton				boolean	default is true
  *
+ * <!-- BasicComboPopup -->
+ *
+ * @uiDefault ComboBox.selectionBackground		Color
+ * @uiDefault ComboBox.selectionForeground		Color
+ *
  * <!-- FlatComboBoxUI -->
  *
  * @uiDefault ComboBox.minimumWidth				int
@@ -88,52 +102,82 @@ import com.formdev.flatlaf.util.UIScale;
  * @uiDefault ComboBox.buttonStyle				String	auto (default), button or none
  * @uiDefault Component.arrowType				String	chevron (default) or triangle
  * @uiDefault Component.isIntelliJTheme			boolean
- * @uiDefault Component.borderColor				Color
- * @uiDefault Component.disabledBorderColor		Color
  * @uiDefault ComboBox.editableBackground		Color	optional; defaults to ComboBox.background
+ * @uiDefault ComboBox.focusedBackground		Color	optional
  * @uiDefault ComboBox.disabledBackground		Color
  * @uiDefault ComboBox.disabledForeground		Color
- * @uiDefault ComboBox.buttonBackground			Color
- * @uiDefault ComboBox.buttonEditableBackground	Color
+ * @uiDefault ComboBox.buttonBackground			Color	optional
+ * @uiDefault ComboBox.buttonEditableBackground	Color	optional
+ * @uiDefault ComboBox.buttonFocusedBackground	Color	optional; defaults to ComboBox.focusedBackground
+ * @uiDefault ComboBox.buttonSeparatorWidth		int or float	optional; defaults to Component.borderWidth
+ * @uiDefault ComboBox.buttonSeparatorColor		Color	optional
+ * @uiDefault ComboBox.buttonDisabledSeparatorColor Color	optional
  * @uiDefault ComboBox.buttonArrowColor			Color
  * @uiDefault ComboBox.buttonDisabledArrowColor	Color
  * @uiDefault ComboBox.buttonHoverArrowColor	Color
  * @uiDefault ComboBox.buttonPressedArrowColor	Color
+ * @uiDefault ComboBox.popupBackground			Color	optional
  *
  * @author Karl Tauber
  */
+@StyleableField( cls=BasicComboBoxUI.class, key="padding" )
+
 public class FlatComboBoxUI
 	extends BasicComboBoxUI
+	implements StyleableUI, StyleableLookupProvider
 {
-	protected int minimumWidth;
-	protected int editorColumns;
-	protected String buttonStyle;
-	protected String arrowType;
+	@Styleable protected int minimumWidth;
+	@Styleable protected int editorColumns;
+	@Styleable protected String buttonStyle;
+	@Styleable protected String arrowType;
 	protected boolean isIntelliJTheme;
-	protected Color borderColor;
-	protected Color disabledBorderColor;
 
-	protected Color editableBackground;
-	protected Color disabledBackground;
-	protected Color disabledForeground;
+	private Color background;
+	@Styleable protected Color editableBackground;
+	@Styleable protected Color focusedBackground;
+	@Styleable protected Color disabledBackground;
+	@Styleable protected Color disabledForeground;
 
-	protected Color buttonBackground;
-	protected Color buttonEditableBackground;
-	protected Color buttonArrowColor;
-	protected Color buttonDisabledArrowColor;
-	protected Color buttonHoverArrowColor;
-	protected Color buttonPressedArrowColor;
+	@Styleable protected Color buttonBackground;
+	@Styleable protected Color buttonEditableBackground;
+	@Styleable protected Color buttonFocusedBackground;
+	/** @since 2 */ @Styleable protected float buttonSeparatorWidth;
+	/** @since 2 */ @Styleable protected Color buttonSeparatorColor;
+	/** @since 2 */ @Styleable protected Color buttonDisabledSeparatorColor;
+	@Styleable protected Color buttonArrowColor;
+	@Styleable protected Color buttonDisabledArrowColor;
+	@Styleable protected Color buttonHoverArrowColor;
+	@Styleable protected Color buttonPressedArrowColor;
+
+	@Styleable protected Color popupBackground;
 
 	private MouseListener hoverListener;
 	protected boolean hover;
 	protected boolean pressed;
 
-	private WeakReference<Component> lastRendererComponent;
+	private CellPaddingBorder paddingBorder;
+
+	private Map<String, Object> oldStyleValues;
+	private AtomicBoolean borderShared;
 
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatComboBoxUI();
 	}
 
+	@Override
+	public void installUI( JComponent c ) {
+		if( FlatUIUtils.needsLightAWTPeer( c ) )
+			FlatUIUtils.runWithLightAWTPeerUIDefaults( () -> installUIImpl( c ) );
+		else
+			installUIImpl( c );
+	}
+
+	private void installUIImpl( JComponent c ) {
+		super.installUI( c );
+
+		installStyle();
+	}
+
 	@Override
 	protected void installListeners() {
 		super.installListeners();
@@ -190,27 +234,32 @@ public class FlatComboBoxUI
 		buttonStyle = UIManager.getString( "ComboBox.buttonStyle" );
 		arrowType = UIManager.getString( "Component.arrowType" );
 		isIntelliJTheme = UIManager.getBoolean( "Component.isIntelliJTheme" );
-		borderColor = UIManager.getColor( "Component.borderColor" );
-		disabledBorderColor = UIManager.getColor( "Component.disabledBorderColor" );
 
+		background = UIManager.getColor( "ComboBox.background" );
 		editableBackground = UIManager.getColor( "ComboBox.editableBackground" );
+		focusedBackground = UIManager.getColor( "ComboBox.focusedBackground" );
 		disabledBackground = UIManager.getColor( "ComboBox.disabledBackground" );
 		disabledForeground = UIManager.getColor( "ComboBox.disabledForeground" );
 
 		buttonBackground = UIManager.getColor( "ComboBox.buttonBackground" );
+		buttonFocusedBackground = UIManager.getColor( "ComboBox.buttonFocusedBackground" );
 		buttonEditableBackground = UIManager.getColor( "ComboBox.buttonEditableBackground" );
+		buttonSeparatorWidth = FlatUIUtils.getUIFloat( "ComboBox.buttonSeparatorWidth", FlatUIUtils.getUIFloat( "Component.borderWidth", 1 ) );
+		buttonSeparatorColor = UIManager.getColor( "ComboBox.buttonSeparatorColor" );
+		buttonDisabledSeparatorColor = UIManager.getColor( "ComboBox.buttonDisabledSeparatorColor" );
 		buttonArrowColor = UIManager.getColor( "ComboBox.buttonArrowColor" );
 		buttonDisabledArrowColor = UIManager.getColor( "ComboBox.buttonDisabledArrowColor" );
 		buttonHoverArrowColor = UIManager.getColor( "ComboBox.buttonHoverArrowColor" );
 		buttonPressedArrowColor = UIManager.getColor( "ComboBox.buttonPressedArrowColor" );
 
+		popupBackground = UIManager.getColor( "ComboBox.popupBackground" );
+
 		// set maximumRowCount
 		int maximumRowCount = UIManager.getInt( "ComboBox.maximumRowCount" );
 		if( maximumRowCount > 0 && maximumRowCount != 8 && comboBox.getMaximumRowCount() == 8 )
 			comboBox.setMaximumRowCount( maximumRowCount );
 
-		// scale
-		padding = UIScale.scale( padding );
+		paddingBorder = new CellPaddingBorder( padding );
 
 		MigLayoutVisualPadding.install( comboBox );
 	}
@@ -219,20 +268,29 @@ public class FlatComboBoxUI
 	protected void uninstallDefaults() {
 		super.uninstallDefaults();
 
-		borderColor = null;
-		disabledBorderColor = null;
-
+		background = null;
 		editableBackground = null;
+		focusedBackground = null;
 		disabledBackground = null;
 		disabledForeground = null;
 
 		buttonBackground = null;
 		buttonEditableBackground = null;
+		buttonFocusedBackground = null;
+		buttonSeparatorColor = null;
+		buttonDisabledSeparatorColor = null;
 		buttonArrowColor = null;
 		buttonDisabledArrowColor = null;
 		buttonHoverArrowColor = null;
 		buttonPressedArrowColor = null;
 
+		popupBackground = null;
+
+		paddingBorder.uninstall();
+
+		oldStyleValues = null;
+		borderShared = null;
+
 		MigLayoutVisualPadding.uninstall( comboBox );
 	}
 
@@ -243,9 +301,31 @@ public class FlatComboBoxUI
 			public void layoutContainer( Container parent ) {
 				super.layoutContainer( parent );
 
-				if ( editor != null && padding != null ) {
-					// fix editor bounds by subtracting padding
-					editor.setBounds( FlatUIUtils.subtractInsets( editor.getBounds(), padding ) );
+				// on macOS, a Swing combo box is used for AWT component java.awt.Choice
+				// and the font may be (temporary) null
+
+				if( arrowButton != null && comboBox.getFont() != null ) {
+					// limit button width to height of a raw combobox (without insets)
+					FontMetrics fm = comboBox.getFontMetrics( comboBox.getFont() );
+					int maxButtonWidth = fm.getHeight() + scale( padding.top ) + scale( padding.bottom );
+					int minButtonWidth = (maxButtonWidth * 3) / 4;
+
+					// make button square (except if width is limited)
+					Insets insets = getInsets();
+					int buttonWidth = Math.min( Math.max( parent.getHeight() - insets.top - insets.bottom, minButtonWidth ), maxButtonWidth );
+
+					if( buttonWidth != arrowButton.getWidth() ) {
+						// set width of arrow button
+						int xOffset = comboBox.getComponentOrientation().isLeftToRight()
+							? arrowButton.getWidth() - buttonWidth
+							: 0;
+						arrowButton.setBounds( arrowButton.getX() + xOffset, arrowButton.getY(),
+							buttonWidth, arrowButton.getHeight() );
+
+						// update editor bounds
+						if( editor != null )
+							editor.setBounds( rectangleForCurrentValue() );
+					}
 				}
 			}
 		};
@@ -289,12 +369,30 @@ public class FlatComboBoxUI
 			} else if( editor != null && source == comboBox && propertyName == "componentOrientation" ) {
 				ComponentOrientation o = (ComponentOrientation) e.getNewValue();
 				editor.applyComponentOrientation( o );
-			} else if( editor != null && FlatClientProperties.PLACEHOLDER_TEXT.equals( propertyName ) )
-				editor.repaint();
-			else if( FlatClientProperties.COMPONENT_ROUND_RECT.equals( propertyName ) )
-				comboBox.repaint();
-			else if( FlatClientProperties.MINIMUM_WIDTH.equals( propertyName ) )
-				comboBox.revalidate();
+			} else {
+				switch( propertyName ) {
+					case PLACEHOLDER_TEXT:
+						if( editor != null )
+							editor.repaint();
+						break;
+
+					case COMPONENT_ROUND_RECT:
+					case OUTLINE:
+						comboBox.repaint();
+						break;
+
+					case MINIMUM_WIDTH:
+						comboBox.revalidate();
+						break;
+
+					case STYLE:
+					case STYLE_CLASS:
+						installStyle();
+						comboBox.revalidate();
+						comboBox.repaint();
+						break;
+				}
+			}
 		};
 	}
 
@@ -304,39 +402,32 @@ public class FlatComboBoxUI
 	}
 
 	@Override
-	protected ComboBoxEditor createEditor() {
-		ComboBoxEditor comboBoxEditor = super.createEditor();
+	protected void configureEditor() {
+		super.configureEditor();
 
-		Component editor = comboBoxEditor.getEditorComponent();
 		if( editor instanceof JTextField ) {
 			JTextField textField = (JTextField) editor;
 			textField.setColumns( editorColumns );
 
-			// assign a non-null and non-javax.swing.plaf.UIResource border to the text field,
-			// otherwise it is replaced with default text field border when switching LaF
-			// because javax.swing.plaf.basic.BasicComboBoxEditor.BorderlessTextField.setBorder()
-			// uses "border instanceof javax.swing.plaf.basic.BasicComboBoxEditor.UIResource"
-			// instead of "border instanceof javax.swing.plaf.UIResource"
-			textField.setBorder( BorderFactory.createEmptyBorder() );
+			// remove default text field border from editor
+			Border border = textField.getBorder();
+			if( border == null || border instanceof UIResource ) {
+				// assign a non-null and non-javax.swing.plaf.UIResource border to the text field,
+				// otherwise it is replaced with default text field border when switching LaF
+				// because javax.swing.plaf.basic.BasicComboBoxEditor.BorderlessTextField.setBorder()
+				// uses "border instanceof javax.swing.plaf.basic.BasicComboBoxEditor.UIResource"
+				// instead of "border instanceof javax.swing.plaf.UIResource"
+				textField.setBorder( BorderFactory.createEmptyBorder() );
+			}
 		}
 
-		return comboBoxEditor;
-	}
-
-	@Override
-	protected void configureEditor() {
-		super.configureEditor();
-
-		// remove default text field border from editor
-		if( editor instanceof JTextField && ((JTextField)editor).getBorder() instanceof FlatTextBorder )
-			((JTextField)editor).setBorder( BorderFactory.createEmptyBorder() );
-
 		// explicitly make non-opaque
 		if( editor instanceof JComponent )
 			((JComponent)editor).setOpaque( false );
 
 		editor.applyComponentOrientation( comboBox.getComponentOrientation() );
 
+		updateEditorPadding();
 		updateEditorColors();
 
 		// macOS
@@ -353,6 +444,25 @@ public class FlatComboBoxUI
 		}
 	}
 
+	private void updateEditorPadding() {
+		if( !(editor instanceof JTextField) )
+			return;
+
+		JTextField textField = (JTextField) editor;
+		Insets insets = textField.getInsets();
+		Insets pad = padding;
+		if( insets.top != 0 || insets.left != 0 || insets.bottom != 0 || insets.right != 0 ) {
+			// if text field has custom border, subtract text field insets from padding
+			pad = new Insets(
+				unscale( Math.max( scale( padding.top ) - insets.top, 0 ) ),
+				unscale( Math.max( scale( padding.left ) - insets.left, 0 ) ),
+				unscale( Math.max( scale( padding.bottom ) - insets.bottom, 0 ) ),
+				unscale( Math.max( scale( padding.right ) - insets.right, 0 ) )
+			);
+		}
+		textField.putClientProperty( TEXT_FIELD_PADDING, pad );
+	}
+
 	private void updateEditorColors() {
 		// use non-UIResource colors because when SwingUtilities.updateComponentTreeUI()
 		// is used, then the editor is updated after the combobox and the
@@ -369,10 +479,74 @@ public class FlatComboBoxUI
 		return new FlatComboBoxButton();
 	}
 
+	/** @since 2 */
+	protected void installStyle() {
+		try {
+			applyStyle( FlatStylingSupport.getResolvedStyle( comboBox, "ComboBox" ) );
+		} catch( RuntimeException ex ) {
+			LoggingFacade.INSTANCE.logSevere( null, ex );
+		}
+	}
+
+	/** @since 2 */
+	protected void applyStyle( Object style ) {
+		Insets oldPadding = padding;
+		int oldEditorColumns = editorColumns;
+
+		oldStyleValues = FlatStylingSupport.parseAndApply( oldStyleValues, style, this::applyStyleProperty );
+
+		if( !padding.equals( oldPadding ) ) {
+			paddingBorder.padding = padding;
+			updateEditorPadding();
+		}
+		if( arrowButton instanceof FlatComboBoxButton )
+			((FlatComboBoxButton)arrowButton).updateStyle();
+		if( popup instanceof FlatComboPopup )
+			((FlatComboPopup)popup).updateStyle();
+		if( editorColumns != oldEditorColumns && editor instanceof JTextField )
+			((JTextField)editor).setColumns( editorColumns );
+	}
+
+	/** @since 2 */
+	protected Object applyStyleProperty( String key, Object value ) {
+		if( borderShared == null )
+			borderShared = new AtomicBoolean( true );
+		return FlatStylingSupport.applyToAnnotatedObjectOrBorder( this, key, value, comboBox, borderShared );
+	}
+
+	/** @since 2 */
+	@Override
+	public Map<String, Class<?>> getStyleableInfos( JComponent c ) {
+		return FlatStylingSupport.getAnnotatedStyleableInfos( this, comboBox.getBorder() );
+	}
+
+	/** @since 2.5 */
+	@Override
+	public Object getStyleableValue( JComponent c, String key ) {
+		return FlatStylingSupport.getAnnotatedStyleableValue( this, comboBox.getBorder(), key );
+	}
+
+	/** @since 2.5 */
+	@Override
+	public MethodHandles.Lookup getLookupForStyling() {
+		// MethodHandles.lookup() is caller sensitive and must be invoked in this class,
+		// otherwise it is not possible to access protected fields in JRE superclass
+		return MethodHandles.lookup();
+	}
+
 	@Override
 	public void update( Graphics g, JComponent c ) {
 		float focusWidth = FlatUIUtils.getBorderFocusWidth( c );
 		float arc = FlatUIUtils.getBorderArc( c );
+		boolean paintBackground = true;
+
+		// check whether used as cell renderer
+		boolean isCellRenderer = c.getParent() instanceof CellRendererPane;
+		if( isCellRenderer ) {
+			focusWidth = 0;
+			arc = 0;
+			paintBackground = isCellRendererBackgroundChanged();
+		}
 
 		// fill background if opaque to avoid garbage if user sets opaque to true
 		if( c.isOpaque() && (focusWidth > 0 || arc > 0) )
@@ -390,27 +564,39 @@ public class FlatComboBoxUI
 		boolean isLeftToRight = comboBox.getComponentOrientation().isLeftToRight();
 
 		// paint background
-		g2.setColor( getBackground( enabled ) );
-		FlatUIUtils.paintComponentBackground( g2, 0, 0, width, height, focusWidth, arc );
-
-		// paint arrow button background
-		if( enabled ) {
-			g2.setColor( paintButton ? buttonEditableBackground : buttonBackground );
-			Shape oldClip = g2.getClip();
-			if( isLeftToRight )
-				g2.clipRect( arrowX, 0, width - arrowX, height );
-			else
-				g2.clipRect( 0, 0, arrowX + arrowWidth, height );
+		if( paintBackground || c.isOpaque() ) {
+			g2.setColor( getBackground( enabled ) );
 			FlatUIUtils.paintComponentBackground( g2, 0, 0, width, height, focusWidth, arc );
-			g2.setClip( oldClip );
-		}
 
-		// paint vertical line between value and arrow button
-		if( paintButton ) {
-			g2.setColor( enabled ? borderColor : disabledBorderColor );
-			float lw = scale( 1f );
-			float lx = isLeftToRight ? arrowX : arrowX + arrowWidth - lw;
-			g2.fill( new Rectangle2D.Float( lx, focusWidth, lw, height - 1 - (focusWidth * 2)) );
+			// paint arrow button background
+			if( enabled && !isCellRenderer ) {
+				Color buttonColor = paintButton
+					? buttonEditableBackground
+					: (buttonFocusedBackground != null || focusedBackground != null) && isPermanentFocusOwner( comboBox )
+						? (buttonFocusedBackground != null ? buttonFocusedBackground : focusedBackground)
+						: buttonBackground;
+				if( buttonColor != null ) {
+					g2.setColor( buttonColor );
+					Shape oldClip = g2.getClip();
+					if( isLeftToRight )
+						g2.clipRect( arrowX, 0, width - arrowX, height );
+					else
+						g2.clipRect( 0, 0, arrowX + arrowWidth, height );
+					FlatUIUtils.paintComponentBackground( g2, 0, 0, width, height, focusWidth, arc );
+					g2.setClip( oldClip );
+				}
+			}
+
+			// paint vertical line between value and arrow button
+			if( paintButton ) {
+				Color separatorColor = enabled ? buttonSeparatorColor : buttonDisabledSeparatorColor;
+				if( separatorColor != null && buttonSeparatorWidth > 0 ) {
+					g2.setColor( separatorColor );
+					float lw = scale( buttonSeparatorWidth );
+					float lx = isLeftToRight ? arrowX : arrowX + arrowWidth - lw;
+					g2.fill( new Rectangle2D.Float( lx, focusWidth, lw, height - 1 - (focusWidth * 2)) );
+				}
+			}
 		}
 
 		// avoid that the "current value" renderer is invoked with enabled antialiasing
@@ -422,30 +608,33 @@ public class FlatComboBoxUI
 	@Override
 	@SuppressWarnings( "unchecked" )
 	public void paintCurrentValue( Graphics g, Rectangle bounds, boolean hasFocus ) {
+		paddingBorder.uninstall();
+
 		ListCellRenderer<Object> renderer = comboBox.getRenderer();
-		uninstallCellPaddingBorder( renderer );
 		if( renderer == null )
 			renderer = new DefaultListCellRenderer();
 		Component c = renderer.getListCellRendererComponent( listBox, comboBox.getSelectedItem(), -1, false, false );
 		c.setFont( comboBox.getFont() );
 		c.applyComponentOrientation( comboBox.getComponentOrientation() );
-		uninstallCellPaddingBorder( c );
 
 		boolean enabled = comboBox.isEnabled();
 		c.setBackground( getBackground( enabled ) );
 		c.setForeground( getForeground( enabled ) );
 
+		// make renderer component temporary non-opaque to avoid that renderer paints
+		// background outside of border if combobox uses larger arc for edges
+		// (e.g. FlatClientProperties.COMPONENT_ROUND_RECT is true)
+		if( c instanceof JComponent )
+			((JComponent)c).setOpaque( false );
+
 		boolean shouldValidate = (c instanceof JPanel);
-		if( padding != null )
-			bounds = FlatUIUtils.subtractInsets( bounds, padding );
-
-		// increase the size of the rendering area to make sure that the text
-		// is vertically aligned with other component types (e.g. JTextField)
-		Insets rendererInsets = getRendererComponentInsets( c );
-		if( rendererInsets != null )
-			bounds = FlatUIUtils.addInsets( bounds, rendererInsets );
 
+		paddingBorder.install( c, 0 );
 		currentValuePane.paintComponent( g, c, comboBox, bounds.x, bounds.y, bounds.width, bounds.height, shouldValidate );
+		paddingBorder.uninstall();
+
+		if( c instanceof JComponent )
+			((JComponent)c).setOpaque( true );
 	}
 
 	@Override
@@ -454,9 +643,23 @@ public class FlatComboBoxUI
 	}
 
 	protected Color getBackground( boolean enabled ) {
-		return enabled
-			? (editableBackground != null && comboBox.isEditable() ? editableBackground : comboBox.getBackground())
-			: (isIntelliJTheme ? FlatUIUtils.getParentBackground( comboBox ) : disabledBackground);
+		if( enabled ) {
+			if( FlatUIUtils.isAWTPeer( comboBox ) )
+				return background;
+
+			Color background = comboBox.getBackground();
+
+			// always use explicitly set color
+			if( !(background instanceof UIResource) )
+				return background;
+
+			// focused
+			if( focusedBackground != null && isPermanentFocusOwner( comboBox ) )
+				return focusedBackground;
+
+			return (editableBackground != null && comboBox.isEditable()) ? editableBackground : background;
+		} else
+			return isIntelliJTheme ? FlatUIUtils.getParentBackground( comboBox ) : disabledBackground;
 	}
 
 	protected Color getForeground( boolean enabled ) {
@@ -466,75 +669,69 @@ public class FlatComboBoxUI
 	@Override
 	public Dimension getMinimumSize( JComponent c ) {
 		Dimension minimumSize = super.getMinimumSize( c );
-		minimumSize.width = Math.max( minimumSize.width, scale( FlatUIUtils.minimumWidth( c, minimumWidth ) ) );
+		int fw = Math.round( FlatUIUtils.getBorderFocusWidth( c ) * 2 );
+		minimumSize.width = Math.max( minimumSize.width, scale( FlatUIUtils.minimumWidth( c, minimumWidth ) ) + fw );
 		return minimumSize;
 	}
 
 	@Override
 	protected Dimension getDefaultSize() {
-		@SuppressWarnings( "unchecked" )
-		ListCellRenderer<Object> renderer = comboBox.getRenderer();
-		uninstallCellPaddingBorder( renderer );
-
+		paddingBorder.uninstall();
 		Dimension size = super.getDefaultSize();
-
-		uninstallCellPaddingBorder( renderer );
+		paddingBorder.uninstall();
 		return size;
 	}
 
 	@Override
 	protected Dimension getDisplaySize() {
-		@SuppressWarnings( "unchecked" )
-		ListCellRenderer<Object> renderer = comboBox.getRenderer();
-		uninstallCellPaddingBorder( renderer );
-
+		paddingBorder.uninstall();
 		Dimension displaySize = super.getDisplaySize();
+		paddingBorder.uninstall();
+
+		// remove padding added in super.getDisplaySize()
+		int displayWidth = displaySize.width - padding.left - padding.right;
+		int displayHeight = displaySize.height - padding.top - padding.bottom;
 
 		// recalculate width without hardcoded 100 under special conditions
-		if( displaySize.width == 100 + padding.left + padding.right &&
+		if( displayWidth == 100 &&
 			comboBox.isEditable() &&
 			comboBox.getItemCount() == 0 &&
 			comboBox.getPrototypeDisplayValue() == null )
 		{
-			int width = getDefaultSize().width;
-			width = Math.max( width, editor.getPreferredSize().width );
-			width += padding.left + padding.right;
-			displaySize = new Dimension( width, displaySize.height );
+			displayWidth = Math.max( getDefaultSize().width, editor.getPreferredSize().width );
 		}
 
-		uninstallCellPaddingBorder( renderer );
-		return displaySize;
+		return new Dimension( displayWidth, displayHeight );
 	}
 
 	@Override
 	protected Dimension getSizeForComponent( Component comp ) {
+		paddingBorder.install( comp, 0 );
 		Dimension size = super.getSizeForComponent( comp );
-
-		// remove the renderer border top/bottom insets from the size to make sure that
-		// the combobox gets the same height as other component types (e.g. JTextField)
-		Insets rendererInsets = getRendererComponentInsets( comp );
-		if( rendererInsets != null )
-			size = new Dimension( size.width, size.height - rendererInsets.top - rendererInsets.bottom );
-
+		paddingBorder.uninstall();
 		return size;
 	}
 
-	private Insets getRendererComponentInsets( Component rendererComponent ) {
-		if( rendererComponent instanceof JComponent ) {
-			Border rendererBorder = ((JComponent)rendererComponent).getBorder();
-			if( rendererBorder != null )
-				return rendererBorder.getBorderInsets( rendererComponent );
-		}
-
-		return null;
+	private boolean isCellRenderer() {
+		return comboBox.getParent() instanceof CellRendererPane;
 	}
 
-	private void uninstallCellPaddingBorder( Object o ) {
-		CellPaddingBorder.uninstall( o );
-		if( lastRendererComponent != null ) {
-			CellPaddingBorder.uninstall( lastRendererComponent );
-			lastRendererComponent = null;
-		}
+	private boolean isCellRendererBackgroundChanged() {
+		// parent is a CellRendererPane, parentParent is e.g. a JTable
+		Container parentParent = comboBox.getParent().getParent();
+		return parentParent != null && !comboBox.getBackground().equals( parentParent.getBackground() );
+	}
+
+	/** @since 1.3 */
+	public static boolean isPermanentFocusOwner( JComboBox<?> comboBox ) {
+		if( comboBox.isEditable() ) {
+			if( FlatUIUtils.isPermanentFocusOwner( comboBox ) )
+				return true;
+
+			Component editorComponent = comboBox.getEditor().getEditorComponent();
+			return editorComponent != null && FlatUIUtils.isPermanentFocusOwner( editorComponent );
+		} else
+			return FlatUIUtils.isPermanentFocusOwner( comboBox );
 	}
 
 	//---- class FlatComboBoxButton -------------------------------------------
@@ -554,6 +751,11 @@ public class FlatComboBoxUI
 				hoverForeground, hoverBackground, pressedForeground, pressedBackground );
 		}
 
+		protected void updateStyle() {
+			updateStyle( arrowType, buttonArrowColor, buttonDisabledArrowColor,
+				buttonHoverArrowColor, null, buttonPressedArrowColor, null );
+		}
+
 		@Override
 		protected boolean isHover() {
 			return super.isHover() || (!comboBox.isEditable() ? hover : false);
@@ -563,6 +765,14 @@ public class FlatComboBoxUI
 		protected boolean isPressed() {
 			return super.isPressed() || (!comboBox.isEditable() ? pressed : false);
 		}
+
+		@Override
+		protected Color getArrowColor() {
+			if( isCellRenderer() && isCellRendererBackgroundChanged() )
+				return comboBox.getForeground();
+
+			return super.getArrowColor();
+		}
 	}
 
 	//---- class FlatComboPopup -----------------------------------------------
@@ -571,13 +781,11 @@ public class FlatComboBoxUI
 	protected class FlatComboPopup
 		extends BasicComboPopup
 	{
-		private CellPaddingBorder paddingBorder;
-
 		protected FlatComboPopup( JComboBox combo ) {
 			super( combo );
 
 			// BasicComboPopup listens to JComboBox.componentOrientation and updates
-			// the component orientation of the list, scroller and popup, but when
+			// the component orientation of the list, scroll pane and popup, but when
 			// switching the LaF and a new combo popup is created, the component
 			// orientation is not applied.
 			ComponentOrientation o = comboBox.getComponentOrientation();
@@ -631,9 +839,15 @@ public class FlatComboBoxUI
 		protected void configurePopup() {
 			super.configurePopup();
 
+			// make opaque to avoid that background shines thru border (e.g. at 150% scaling)
+			setOpaque( true );
+
+	        // set popup border
+	        // use non-UIResource to avoid that it is overwritten when making
+	        // popup visible (see JPopupMenu.setInvoker()) in theme editor preview
 			Border border = UIManager.getBorder( "PopupMenu.border" );
 			if( border != null )
-				setBorder( border );
+				setBorder( FlatUIUtils.nonUIResource( border ) );
 		}
 
 		@Override
@@ -641,6 +855,17 @@ public class FlatComboBoxUI
 			super.configureList();
 
 			list.setCellRenderer( new PopupListCellRenderer() );
+			updateStyle();
+		}
+
+		void updateStyle() {
+			if( popupBackground != null )
+		        list.setBackground( popupBackground );
+
+	        // set popup background because it may shine thru when scaled (e.g. at 150%)
+	        // use non-UIResource to avoid that it is overwritten when making
+	        // popup visible (see JPopupMenu.setInvoker()) in theme editor preview
+	        setBackground( FlatUIUtils.nonUIResource( list.getBackground() ) );
 		}
 
 		@Override
@@ -654,6 +879,34 @@ public class FlatComboBoxUI
 			};
 		}
 
+		@Override
+		protected int getPopupHeightForRowCount( int maxRowCount ) {
+			int height = super.getPopupHeightForRowCount( maxRowCount );
+			paddingBorder.uninstall();
+			return height;
+		}
+
+		@Override
+		public void show( Component invoker, int x, int y ) {
+			// Java 8: fix y coordinate if popup is shown above the combobox
+			// (already fixed in Java 9+ https://bugs.openjdk.java.net/browse/JDK-7072653)
+			if( y < 0 && !SystemInfo.isJava_9_orLater ) {
+				Border popupBorder = getBorder();
+				if( popupBorder != null ) {
+					Insets insets = popupBorder.getBorderInsets( this );
+					y -= insets.top + insets.bottom;
+				}
+			}
+
+			super.show( invoker, x, y );
+		}
+
+		@Override
+		protected void paintChildren( Graphics g ) {
+			super.paintChildren( g );
+			paddingBorder.uninstall();
+		}
+
 		//---- class PopupListCellRenderer -----
 
 		private class PopupListCellRenderer
@@ -663,22 +916,15 @@ public class FlatComboBoxUI
 			public Component getListCellRendererComponent( JList list, Object value,
 				int index, boolean isSelected, boolean cellHasFocus )
 			{
-				ListCellRenderer renderer = comboBox.getRenderer();
-				CellPaddingBorder.uninstall( renderer );
-				CellPaddingBorder.uninstall( lastRendererComponent );
+				paddingBorder.uninstall();
 
+				ListCellRenderer renderer = comboBox.getRenderer();
 				if( renderer == null )
 					renderer = new DefaultListCellRenderer();
 				Component c = renderer.getListCellRendererComponent( list, value, index, isSelected, cellHasFocus );
 				c.applyComponentOrientation( comboBox.getComponentOrientation() );
 
-				if( c instanceof JComponent ) {
-					if( paddingBorder == null )
-						paddingBorder = new CellPaddingBorder( padding );
-					paddingBorder.install( (JComponent) c );
-				}
-
-				lastRendererComponent = (c != renderer) ? new WeakReference<>( c ) : null;
+				paddingBorder.install( c, Math.round( FlatUIUtils.getBorderFocusWidth( comboBox ) ) );
 
 				return c;
 			}
@@ -688,50 +934,75 @@ public class FlatComboBoxUI
 	//---- class CellPaddingBorder --------------------------------------------
 
 	/**
-	 * Cell padding border used only in popup list.
-	 *
+	 * Cell padding border used in popup list and for current value if not editable.
+	 * <p>
 	 * The insets are the union of the cell padding and the renderer border insets,
 	 * which vertically aligns text in popup list with text in combobox.
-	 *
-	 * The renderer border is painted on the outside of this border.
+	 * <p>
+	 * The renderer border is painted on the outer side of this border.
 	 */
 	private static class CellPaddingBorder
 		extends AbstractBorder
 	{
-		private final Insets padding;
+		private Insets padding;
+		private JComponent rendererComponent;
 		private Border rendererBorder;
+		private int focusWidth;
 
 		CellPaddingBorder( Insets padding ) {
 			this.padding = padding;
 		}
 
-		void install( JComponent rendererComponent ) {
-			Border oldBorder = rendererComponent.getBorder();
-			if( !(oldBorder instanceof CellPaddingBorder) ) {
-				rendererBorder = oldBorder;
-				rendererComponent.setBorder( this );
-			}
-		}
-
-		static void uninstall( Object o ) {
-			if( o instanceof WeakReference )
-				o = ((WeakReference<?>)o).get();
-
-			if( !(o instanceof JComponent) )
+		// using synchronized to avoid problems with code that modifies combo box
+		// (model, selection, etc) not on AWT thread (which should be not done)
+		synchronized void install( Component c, int focusWidth ) {
+			if( !(c instanceof JComponent) )
 				return;
 
-			JComponent rendererComponent = (JComponent) o;
-			Border border = rendererComponent.getBorder();
-			if( border instanceof CellPaddingBorder ) {
-				CellPaddingBorder paddingBorder = (CellPaddingBorder) border;
-				rendererComponent.setBorder( paddingBorder.rendererBorder );
-				paddingBorder.rendererBorder = null;
-			}
+			this.focusWidth = focusWidth;
+
+			JComponent jc = (JComponent) c;
+			Border oldBorder = jc.getBorder();
+			if( oldBorder == this )
+				return; // already installed
+
+			// component already has a padding border --> uninstall it
+			// (may happen if single renderer instance is used in multiple comboboxes)
+			if( oldBorder instanceof CellPaddingBorder )
+				((CellPaddingBorder)oldBorder).uninstall();
+
+			// this border can be installed only at one component
+			// (may happen if a renderer returns varying components)
+			uninstall();
+
+			// remember component where this border was installed for uninstall
+			rendererComponent = jc;
+
+			// remember old border and replace it
+			rendererBorder = jc.getBorder();
+			jc.setBorder( this );
+		}
+
+		/**
+		 * Uninstall border from previously installed component.
+		 * Because this border is installed in PopupListCellRenderer.getListCellRendererComponent(),
+		 * there is no single place to uninstall it.
+		 * This is the reason why this method is called from various places.
+		 */
+		synchronized void uninstall() {
+			if( rendererComponent == null )
+				return;
+
+			if( rendererComponent.getBorder() == this )
+				rendererComponent.setBorder( rendererBorder );
+			rendererComponent = null;
+			rendererBorder = null;
 		}
 
 		@Override
-		public Insets getBorderInsets( Component c, Insets insets ) {
-			if( rendererBorder != null ) {
+		synchronized public Insets getBorderInsets( Component c, Insets insets ) {
+			Insets padding = scale( this.padding );
+			if( rendererBorder != null && !(rendererBorder instanceof CellPaddingBorder) ) {
 				Insets insideInsets = rendererBorder.getBorderInsets( c );
 				insets.top = Math.max( padding.top, insideInsets.top );
 				insets.left = Math.max( padding.left, insideInsets.left );
@@ -743,6 +1014,12 @@ public class FlatComboBoxUI
 				insets.bottom = padding.bottom;
 				insets.right = padding.right;
 			}
+
+			// if used in popup list, add focus width for exact vertical alignment
+			// of text in popup list with text in combobox
+			insets.left += focusWidth;
+			insets.right += focusWidth;
+
 			return insets;
 		}
 

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatDesktopIconUI.java

@@ -16,10 +16,12 @@
 
 package com.formdev.flatlaf.ui;
 
+import java.awt.Color;
 import java.awt.Component;
 import java.awt.Container;
 import java.awt.Dimension;
 import java.awt.EventQueue;
+import java.awt.Graphics;
 import java.awt.Graphics2D;
 import java.awt.Image;
 import java.awt.Insets;
@@ -28,11 +30,13 @@ import java.awt.Point;
 import java.awt.event.ActionListener;
 import java.awt.event.MouseEvent;
 import java.awt.image.BufferedImage;
+import java.beans.PropertyChangeListener;
 import java.beans.PropertyVetoException;
 import javax.swing.BorderFactory;
 import javax.swing.ImageIcon;
 import javax.swing.JButton;
 import javax.swing.JComponent;
+import javax.swing.JDesktopPane;
 import javax.swing.event.MouseInputAdapter;
 import javax.swing.event.MouseInputListener;
 import javax.swing.JLabel;
@@ -45,6 +49,7 @@ import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicDesktopIconUI;
+import com.formdev.flatlaf.util.MultiResolutionImageSupport;
 import com.formdev.flatlaf.util.UIScale;
 
 /**
@@ -75,11 +80,21 @@ public class FlatDesktopIconUI
 	private JToolTip titleTip;
 	private ActionListener closeListener;
 	private MouseInputListener mouseInputListener;
+	private PropertyChangeListener ancestorListener;
 
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatDesktopIconUI();
 	}
 
+	@Override
+	public void installUI( JComponent c ) {
+		super.installUI( c );
+
+		// update dock icon preview if already iconified
+		if( c.isDisplayable() )
+			updateDockIconPreviewLater();
+	}
+
 	@Override
 	public void uninstallUI( JComponent c ) {
 		super.uninstallUI( c );
@@ -136,6 +151,17 @@ public class FlatDesktopIconUI
 		};
 		closeButton.addActionListener( closeListener );
 		closeButton.addMouseListener( mouseInputListener );
+
+		ancestorListener = e -> {
+			if( e.getNewValue() != null ) {
+				// update dock icon preview if desktopIcon is added to desktop (internal frame was iconified)
+				updateDockIconPreviewLater();
+			} else {
+				// remove preview icon to release memory
+				dockIcon.setIcon( null );
+			}
+		};
+		desktopIcon.addPropertyChangeListener( "ancestor", ancestorListener );
 	}
 
 	@Override
@@ -146,6 +172,9 @@ public class FlatDesktopIconUI
 		closeButton.removeMouseListener( mouseInputListener );
 		closeListener = null;
 		mouseInputListener = null;
+
+		desktopIcon.removePropertyChangeListener( "ancestor", ancestorListener );
+		ancestorListener = null;
 	}
 
 	@Override
@@ -228,15 +257,30 @@ public class FlatDesktopIconUI
 		return getPreferredSize( c );
 	}
 
-	void updateDockIcon() {
+	@Override
+	public void update( Graphics g, JComponent c ) {
+		if( c.isOpaque() ) {
+			// fill background with color derived from desktop pane
+			Color background = c.getBackground();
+			JDesktopPane desktopPane = desktopIcon.getDesktopPane();
+			g.setColor( (desktopPane != null)
+				? FlatUIUtils.deriveColor( background, desktopPane.getBackground() )
+				: background );
+			g.fillRect( 0, 0, c.getWidth(), c.getHeight() );
+		}
+
+		paint( g, c );
+	}
+
+	private void updateDockIconPreviewLater() {
 		// use invoke later to make sure that components are updated when switching LaF
 		EventQueue.invokeLater( () -> {
 			if( dockIcon != null )
-				updateDockIconLater();
+				updateDockIconPreview();
 		} );
 	}
 
-	private void updateDockIconLater() {
+	protected void updateDockIconPreview() {
 		// make sure that frame is not selected
 		if( frame.isSelected() ) {
 			try {
@@ -246,13 +290,22 @@ public class FlatDesktopIconUI
 			}
 		}
 
+		// layout internal frame title pane, which was recreated when switching Laf
+		// (directly invoke doLayout() because frame.validate() does not work here
+		// because frame is not displayable)
+		if( !frame.isValid() )
+			frame.doLayout();
+		for( Component c : frame.getComponents() ) {
+			if( !c.isValid() )
+				c.doLayout();
+		}
+
 		// paint internal frame to buffered image
 		int frameWidth = Math.max( frame.getWidth(), 1 );
 		int frameHeight = Math.max( frame.getHeight(), 1 );
 		BufferedImage frameImage = new BufferedImage( frameWidth, frameHeight, BufferedImage.TYPE_INT_ARGB );
 		Graphics2D g = frameImage.createGraphics();
 		try {
-			//TODO fix missing internal frame header when switching LaF
 			frame.paint( g );
 		} finally {
 			g.dispose();
@@ -270,6 +323,27 @@ public class FlatDesktopIconUI
 
 		// scale preview
 		Image previewImage = frameImage.getScaledInstance( previewWidth, previewHeight, Image.SCALE_SMOOTH );
+		if( MultiResolutionImageSupport.isAvailable() ) {
+			// On HiDPI screens, create preview images for 1x, 2x and current scale factor.
+			// The icon then chooses the best resolution for painting, which is usually
+			// the one for the current scale factor. But if changing scale factor or
+			// moving window to another screen with different scale factor, then another
+			// resolution may be used because the preview icon is not updated.
+			Image previewImage2x = frameImage.getScaledInstance( previewWidth * 2, previewHeight * 2, Image.SCALE_SMOOTH );
+			double scaleFactor = UIScale.getSystemScaleFactor( desktopIcon.getGraphicsConfiguration() );
+			if( scaleFactor != 1 && scaleFactor != 2 ) {
+				Image previewImageCurrent = frameImage.getScaledInstance(
+					(int) Math.round( previewWidth * scaleFactor ),
+					(int) Math.round( previewHeight * scaleFactor ),
+					Image.SCALE_SMOOTH );
+
+				// the images must be ordered by resolution
+				previewImage = (scaleFactor < 2)
+					? MultiResolutionImageSupport.create( 0, previewImage, previewImageCurrent, previewImage2x )
+					: MultiResolutionImageSupport.create( 0, previewImage, previewImage2x, previewImageCurrent );
+			} else
+				previewImage = MultiResolutionImageSupport.create( 0, previewImage, previewImage2x );
+		}
 		dockIcon.setIcon( new ImageIcon( previewImage ) );
 	}
 

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatDesktopPaneUI.java

@@ -16,11 +16,16 @@
 
 package com.formdev.flatlaf.ui;
 
-import javax.swing.DefaultDesktopManager;
+import java.awt.Component;
+import java.awt.Dimension;
+import java.awt.EventQueue;
+import java.awt.event.ComponentAdapter;
+import java.awt.event.ComponentEvent;
+import java.awt.event.ContainerEvent;
+import java.awt.event.ContainerListener;
 import javax.swing.JComponent;
-import javax.swing.JInternalFrame;
+import javax.swing.JInternalFrame.JDesktopIcon;
 import javax.swing.plaf.ComponentUI;
-import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicDesktopPaneUI;
 
 /**
@@ -36,30 +41,96 @@ import javax.swing.plaf.basic.BasicDesktopPaneUI;
 public class FlatDesktopPaneUI
 	extends BasicDesktopPaneUI
 {
+	private LayoutDockListener layoutDockListener;
+	private boolean layoutDockPending;
+
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatDesktopPaneUI();
 	}
 
 	@Override
-	protected void installDesktopManager() {
-		desktopManager = desktop.getDesktopManager();
-		if( desktopManager == null ) {
-			desktopManager = new FlatDesktopManager();
-			desktop.setDesktopManager( desktopManager );
+	public void installUI( JComponent c ) {
+		super.installUI( c );
+
+		layoutDockLaterOnce();
+	}
+
+	@Override
+	protected void installListeners() {
+		super.installListeners();
+
+		layoutDockListener = new LayoutDockListener();
+		desktop.addContainerListener( layoutDockListener );
+		desktop.addComponentListener( layoutDockListener );
+	}
+
+	@Override
+	protected void uninstallListeners() {
+		super.uninstallListeners();
+
+		desktop.removeContainerListener( layoutDockListener );
+		desktop.removeComponentListener( layoutDockListener );
+		layoutDockListener = null;
+	}
+
+	private void layoutDockLaterOnce() {
+		if( layoutDockPending )
+			return;
+		layoutDockPending = true;
+
+		EventQueue.invokeLater( () -> {
+			layoutDockPending = false;
+			if( desktop != null )
+				layoutDock();
+		} );
+	}
+
+	protected void layoutDock() {
+		Dimension desktopSize = desktop.getSize();
+		int x = 0;
+		int y = desktopSize.height;
+		int rowHeight = 0;
+
+		for( Component c : desktop.getComponents() ) {
+			if( !(c instanceof JDesktopIcon) )
+				continue;
+
+			JDesktopIcon icon = (JDesktopIcon) c;
+			Dimension iconSize = icon.getPreferredSize();
+
+			if( x + iconSize.width > desktopSize.width ) {
+				// new row
+				x = 0;
+				y -= rowHeight;
+				rowHeight = 0;
+			}
+
+			icon.setLocation( x, y - iconSize.height );
+
+			x += iconSize.width;
+			rowHeight = Math.max( iconSize.height, rowHeight );
 		}
 	}
 
-	//---- class FlatDesktopManager -------------------------------------------
+	//---- class LayoutDockListener -------------------------------------------
 
-	private class FlatDesktopManager
-		extends DefaultDesktopManager
-		implements UIResource
+	private class LayoutDockListener
+		extends ComponentAdapter
+		implements ContainerListener
 	{
 		@Override
-		public void iconifyFrame( JInternalFrame f ) {
-			super.iconifyFrame( f );
+		public void componentAdded( ContainerEvent e ) {
+			layoutDockLaterOnce();
+		}
 
-			((FlatDesktopIconUI)f.getDesktopIcon().getUI()).updateDockIcon();
+		@Override
+		public void componentRemoved( ContainerEvent e ) {
+			layoutDockLaterOnce();
+		}
+
+		@Override
+		public void componentResized( ComponentEvent e ) {
+			layoutDockLaterOnce();
 		}
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatDropShadowBorder.java

@@ -24,6 +24,9 @@ import java.awt.Image;
 import java.awt.Insets;
 import java.awt.RadialGradientPaint;
 import java.awt.image.BufferedImage;
+import java.util.Map;
+import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableBorder;
 import com.formdev.flatlaf.util.HiDPIUtils;
 import com.formdev.flatlaf.util.UIScale;
 
@@ -40,14 +43,17 @@ import com.formdev.flatlaf.util.UIScale;
  */
 public class FlatDropShadowBorder
 	extends FlatEmptyBorder
+	implements StyleableBorder
 {
-	private final Color shadowColor;
-	private final Insets shadowInsets;
-	private final float shadowOpacity;
+	@Styleable protected Color shadowColor;
+	@Styleable protected Insets shadowInsets;
+	@Styleable protected float shadowOpacity;
 
-	private final int shadowSize;
+	private int shadowSize;
 	private Image shadowImage;
 	private Color lastShadowColor;
+	private float lastShadowOpacity;
+	private int lastShadowSize;
 	private double lastSystemScaleFactor;
 	private float lastUserScaleFactor;
 
@@ -64,17 +70,49 @@ public class FlatDropShadowBorder
 	}
 
 	public FlatDropShadowBorder( Color shadowColor, Insets shadowInsets, float shadowOpacity ) {
-		super( Math.max( shadowInsets.top, 0 ), Math.max( shadowInsets.left, 0 ),
-			Math.max( shadowInsets.bottom, 0 ), Math.max( shadowInsets.right, 0 ) );
+		super( nonNegativeInsets( shadowInsets ) );
+
 		this.shadowColor = shadowColor;
 		this.shadowInsets = shadowInsets;
 		this.shadowOpacity = shadowOpacity;
 
-		shadowSize = Math.max(
+		shadowSize = maxInset( shadowInsets );
+	}
+
+	private static Insets nonNegativeInsets( Insets shadowInsets ) {
+		return new Insets( Math.max( shadowInsets.top, 0 ), Math.max( shadowInsets.left, 0 ),
+			Math.max( shadowInsets.bottom, 0 ), Math.max( shadowInsets.right, 0 ) );
+	}
+
+	private int maxInset( Insets shadowInsets ) {
+		return Math.max(
 			Math.max( shadowInsets.left, shadowInsets.right ),
 			Math.max( shadowInsets.top, shadowInsets.bottom ) );
 	}
 
+	/** @since 2 */
+	@Override
+	public Object applyStyleProperty( String key, Object value ) {
+		Object oldValue = FlatStylingSupport.applyToAnnotatedObject( this, key, value );
+		if( key.equals( "shadowInsets" ) ) {
+			applyStyleProperty( nonNegativeInsets( shadowInsets ) );
+			shadowSize = maxInset( shadowInsets );
+		}
+		return oldValue;
+	}
+
+	/** @since 2 */
+	@Override
+	public Map<String, Class<?>> getStyleableInfos() {
+		return FlatStylingSupport.getAnnotatedStyleableInfos( this );
+	}
+
+	/** @since 2.5 */
+	@Override
+	public Object getStyleableValue( String key ) {
+		return FlatStylingSupport.getAnnotatedStyleableValue( this, key );
+	}
+
 	@Override
 	public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
 		if( shadowSize <= 0 )
@@ -91,12 +129,16 @@ public class FlatDropShadowBorder
 		float userScaleFactor = UIScale.getUserScaleFactor();
 		if( shadowImage == null ||
 			!shadowColor.equals( lastShadowColor ) ||
+			lastShadowOpacity != shadowOpacity ||
+			lastShadowSize != shadowSize ||
 			lastSystemScaleFactor != scaleFactor ||
 			lastUserScaleFactor != userScaleFactor )
 		{
 			shadowImage = createShadowImage( shadowColor, shadowSize, shadowOpacity,
 				(float) (scaleFactor * userScaleFactor) );
 			lastShadowColor = shadowColor;
+			lastShadowOpacity = shadowOpacity;
+			lastShadowSize = shadowSize;
 			lastSystemScaleFactor = scaleFactor;
 			lastUserScaleFactor = userScaleFactor;
 		}

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatEditorPaneUI.java

@@ -17,19 +17,26 @@
 package com.formdev.flatlaf.ui;
 
 import static com.formdev.flatlaf.util.UIScale.scale;
+import java.awt.Color;
 import java.awt.Dimension;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
+import java.awt.Insets;
+import java.awt.event.FocusListener;
 import java.beans.PropertyChangeEvent;
+import java.util.Map;
 import javax.swing.JComponent;
 import javax.swing.JEditorPane;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
-import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicEditorPaneUI;
+import javax.swing.text.Caret;
 import javax.swing.text.JTextComponent;
 import com.formdev.flatlaf.FlatClientProperties;
+import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableUI;
 import com.formdev.flatlaf.util.HiDPIUtils;
+import com.formdev.flatlaf.util.LoggingFacade;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JEditorPane}.
@@ -37,8 +44,8 @@ import com.formdev.flatlaf.util.HiDPIUtils;
  * <!-- BasicEditorPaneUI -->
  *
  * @uiDefault EditorPane.font					Font
- * @uiDefault EditorPane.background				Color	also used if not editable
- * @uiDefault EditorPane.foreground				Color
+ * @uiDefault EditorPane.background				Color
+ * @uiDefault EditorPane.foreground				Color	also used if not editable
  * @uiDefault EditorPane.caretForeground		Color
  * @uiDefault EditorPane.selectionBackground	Color
  * @uiDefault EditorPane.selectionForeground	Color
@@ -53,27 +60,54 @@ import com.formdev.flatlaf.util.HiDPIUtils;
  *
  * @uiDefault Component.minimumWidth			int
  * @uiDefault Component.isIntelliJTheme			boolean
+ * @uiDefault EditorPane.focusedBackground		Color	optional
  *
  * @author Karl Tauber
  */
 public class FlatEditorPaneUI
 	extends BasicEditorPaneUI
+	implements StyleableUI
 {
-	protected int minimumWidth;
+	@Styleable protected int minimumWidth;
 	protected boolean isIntelliJTheme;
+	private Color background;
+	@Styleable protected Color disabledBackground;
+	@Styleable protected Color inactiveBackground;
+	@Styleable protected Color focusedBackground;
+
+	private Color oldDisabledBackground;
+	private Color oldInactiveBackground;
+
+	private Insets defaultMargin;
 
 	private Object oldHonorDisplayProperties;
+	private FocusListener focusListener;
+	private Map<String, Object> oldStyleValues;
 
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatEditorPaneUI();
 	}
 
+	@Override
+	public void installUI( JComponent c ) {
+		super.installUI( c );
+
+		installStyle();
+	}
+
 	@Override
 	protected void installDefaults() {
 		super.installDefaults();
 
+		String prefix = getPropertyPrefix();
 		minimumWidth = UIManager.getInt( "Component.minimumWidth" );
 		isIntelliJTheme = UIManager.getBoolean( "Component.isIntelliJTheme" );
+		background = UIManager.getColor( prefix + ".background" );
+		disabledBackground = UIManager.getColor( prefix + ".disabledBackground" );
+		inactiveBackground = UIManager.getColor( prefix + ".inactiveBackground" );
+		focusedBackground = UIManager.getColor( prefix + ".focusedBackground" );
+
+		defaultMargin = UIManager.getInsets( prefix + ".margin" );
 
 		// use component font and foreground for HTML text
 		oldHonorDisplayProperties = getComponent().getClientProperty( JEditorPane.HONOR_DISPLAY_PROPERTIES );
@@ -84,34 +118,124 @@ public class FlatEditorPaneUI
 	protected void uninstallDefaults() {
 		super.uninstallDefaults();
 
+		background = null;
+		disabledBackground = null;
+		inactiveBackground = null;
+		focusedBackground = null;
+
+		oldDisabledBackground = null;
+		oldInactiveBackground = null;
+
+		oldStyleValues = null;
+
 		getComponent().putClientProperty( JEditorPane.HONOR_DISPLAY_PROPERTIES, oldHonorDisplayProperties );
 	}
 
 	@Override
-	protected void propertyChange( PropertyChangeEvent e ) {
-		super.propertyChange( e );
-		propertyChange( getComponent(), e );
+	protected void installListeners() {
+		super.installListeners();
+
+		// necessary to update focus background
+		focusListener = new FlatUIUtils.RepaintFocusListener( getComponent(), c -> focusedBackground != null );
+		getComponent().addFocusListener( focusListener );
 	}
 
-	static void propertyChange( JTextComponent c, PropertyChangeEvent e ) {
+	@Override
+	protected void uninstallListeners() {
+		super.uninstallListeners();
+
+		getComponent().removeFocusListener( focusListener );
+		focusListener = null;
+	}
+
+	@Override
+	protected Caret createCaret() {
+		return new FlatCaret( null, false );
+	}
+
+	@Override
+	protected void propertyChange( PropertyChangeEvent e ) {
+		// invoke updateBackground() before super.propertyChange()
+		String propertyName = e.getPropertyName();
+		if( "editable".equals( propertyName ) || "enabled".equals( propertyName ) )
+			updateBackground();
+
+		super.propertyChange( e );
+		propertyChange( getComponent(), e, this::installStyle );
+	}
+
+	static void propertyChange( JTextComponent c, PropertyChangeEvent e, Runnable installStyle ) {
 		switch( e.getPropertyName() ) {
 			case FlatClientProperties.MINIMUM_WIDTH:
 				c.revalidate();
 				break;
+
+			case FlatClientProperties.STYLE:
+			case FlatClientProperties.STYLE_CLASS:
+				installStyle.run();
+				c.revalidate();
+				c.repaint();
+				break;
 		}
 	}
 
+	/** @since 2 */
+	protected void installStyle() {
+		try {
+			applyStyle( FlatStylingSupport.getResolvedStyle( getComponent(), "EditorPane" ) );
+		} catch( RuntimeException ex ) {
+			LoggingFacade.INSTANCE.logSevere( null, ex );
+		}
+	}
+
+	/** @since 2 */
+	protected void applyStyle( Object style ) {
+		oldDisabledBackground = disabledBackground;
+		oldInactiveBackground = inactiveBackground;
+
+		oldStyleValues = FlatStylingSupport.parseAndApply( oldStyleValues, style, this::applyStyleProperty );
+
+		updateBackground();
+	}
+
+	/** @since 2 */
+	protected Object applyStyleProperty( String key, Object value ) {
+		return FlatStylingSupport.applyToAnnotatedObjectOrComponent( this, getComponent(), key, value );
+	}
+
+	/** @since 2 */
+	@Override
+	public Map<String, Class<?>> getStyleableInfos( JComponent c ) {
+		return FlatStylingSupport.getAnnotatedStyleableInfos( this );
+	}
+
+	/** @since 2.5 */
+	@Override
+	public Object getStyleableValue( JComponent c, String key ) {
+		return FlatStylingSupport.getAnnotatedStyleableValue( this, key );
+	}
+
+	private void updateBackground() {
+		FlatTextFieldUI.updateBackground( getComponent(), background,
+			disabledBackground, inactiveBackground,
+			oldDisabledBackground, oldInactiveBackground );
+	}
+
 	@Override
 	public Dimension getPreferredSize( JComponent c ) {
-		return applyMinimumWidth( c, super.getPreferredSize( c ), minimumWidth );
+		return applyMinimumWidth( c, super.getPreferredSize( c ), minimumWidth, defaultMargin );
 	}
 
 	@Override
 	public Dimension getMinimumSize( JComponent c ) {
-		return applyMinimumWidth( c, super.getMinimumSize( c ), minimumWidth );
+		return applyMinimumWidth( c, super.getMinimumSize( c ), minimumWidth, defaultMargin );
 	}
 
-	static Dimension applyMinimumWidth( JComponent c, Dimension size, int minimumWidth ) {
+	static Dimension applyMinimumWidth( JComponent c, Dimension size, int minimumWidth, Insets defaultMargin ) {
+		// do not apply minimum width if JTextComponent.margin is set
+		if( !FlatTextFieldUI.hasDefaultMargins( c, defaultMargin ) )
+			return size;
+
 		// Assume that text area is in a scroll pane (that displays the border)
 		// and subtract 1px border line width.
 		// Using "(scale( 1 ) * 2)" instead of "scale( 2 )" to deal with rounding
@@ -128,14 +252,11 @@ public class FlatEditorPaneUI
 
 	@Override
 	protected void paintBackground( Graphics g ) {
-		JTextComponent c = getComponent();
+		paintBackground( g, getComponent(), isIntelliJTheme, focusedBackground );
+	}
 
-		// for compatibility with IntelliJ themes
-		if( isIntelliJTheme && (!c.isEnabled() || !c.isEditable()) && (c.getBackground() instanceof UIResource) ) {
-			FlatUIUtils.paintParentBackground( g, c );
-			return;
-		}
-
-		super.paintBackground( g );
+	static void paintBackground( Graphics g, JTextComponent c, boolean isIntelliJTheme, Color focusedBackground ) {
+		g.setColor( FlatTextFieldUI.getBackground( c, isIntelliJTheme, focusedBackground ) );
+		g.fillRect( 0, 0, c.getWidth(), c.getHeight() );
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatEmptyBorder.java

@@ -50,7 +50,13 @@ public class FlatEmptyBorder
 
 	@Override
 	public Insets getBorderInsets( Component c, Insets insets ) {
-		boolean leftToRight = left == right || c.getComponentOrientation().isLeftToRight();
+		return scaleInsets( c, insets, top, left, bottom, right );
+	}
+
+	protected static Insets scaleInsets( Component c, Insets insets,
+		int top, int left, int bottom, int right )
+	{
+		boolean leftToRight = left == right || c == null || c.getComponentOrientation().isLeftToRight();
 		insets.left = scale( leftToRight ? left : right );
 		insets.top = scale( top );
 		insets.right = scale( leftToRight ? right : left );
@@ -61,4 +67,18 @@ public class FlatEmptyBorder
 	public Insets getUnscaledBorderInsets() {
 		return super.getBorderInsets();
 	}
+
+	public Object applyStyleProperty( Insets insets ) {
+		Insets oldInsets = getUnscaledBorderInsets();
+		top = insets.top;
+		left = insets.left;
+		bottom = insets.bottom;
+		right = insets.right;
+		return oldInsets;
+	}
+
+	/** @since 2.5 */
+	public Insets getStyleableValue() {
+		return new Insets( top, left, bottom, right );
+	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatFileChooserUI.java

@@ -19,11 +19,21 @@ package com.formdev.flatlaf.ui;
 import java.awt.BorderLayout;
 import java.awt.Component;
 import java.awt.Dimension;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.Image;
 import java.awt.Insets;
+import java.awt.LayoutManager;
+import java.awt.RenderingHints;
+import java.beans.PropertyChangeEvent;
+import java.beans.PropertyChangeListener;
 import java.io.File;
+import java.lang.reflect.Method;
+import java.util.function.Function;
 import javax.swing.AbstractButton;
 import javax.swing.Box;
 import javax.swing.BoxLayout;
+import javax.swing.ButtonGroup;
 import javax.swing.Icon;
 import javax.swing.ImageIcon;
 import javax.swing.JButton;
@@ -34,12 +44,16 @@ import javax.swing.JPanel;
 import javax.swing.JScrollPane;
 import javax.swing.JTable;
 import javax.swing.JToggleButton;
+import javax.swing.JToolBar;
+import javax.swing.SwingConstants;
 import javax.swing.UIManager;
+import javax.swing.filechooser.FileSystemView;
 import javax.swing.filechooser.FileView;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.metal.MetalFileChooserUI;
 import javax.swing.table.TableCellRenderer;
 import com.formdev.flatlaf.FlatClientProperties;
+import com.formdev.flatlaf.util.LoggingFacade;
 import com.formdev.flatlaf.util.ScaledImageIcon;
 import com.formdev.flatlaf.util.SystemInfo;
 import com.formdev.flatlaf.util.UIScale;
@@ -133,12 +147,21 @@ import com.formdev.flatlaf.util.UIScale;
  * @uiDefault FileChooser.listViewActionLabelText				String
  * @uiDefault FileChooser.detailsViewActionLabelText			String
  *
+ * <!-- FlatFileChooserUI -->
+ *
+ * @uiDefault FileChooser.shortcuts.buttonSize					Dimension	optional; default is 84,64
+ * @uiDefault FileChooser.shortcuts.iconSize					Dimension	optional; default is 32,32
+ * @uiDefault FileChooser.shortcuts.filesFunction				Function&lt;File[], File[]&gt;
+ * @uiDefault FileChooser.shortcuts.displayNameFunction			Function&lt;File, String&gt;
+ * @uiDefault FileChooser.shortcuts.iconFunction				Function&lt;File, Icon&gt;
+ *
  * @author Karl Tauber
  */
 public class FlatFileChooserUI
 	extends MetalFileChooserUI
 {
 	private final FlatFileView fileView = new FlatFileView();
+	private FlatShortcutsPanel shortcutsPanel;
 
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatFileChooserUI( (JFileChooser) c );
@@ -153,6 +176,25 @@ public class FlatFileChooserUI
 		super.installComponents( fc );
 
 		patchUI( fc );
+
+		if( !UIManager.getBoolean( "FileChooser.noPlacesBar" ) ) { // same as in Windows L&F
+			FlatShortcutsPanel panel = createShortcutsPanel( fc );
+			if( panel.getComponentCount() > 0 ) {
+				shortcutsPanel = panel;
+				fc.add( shortcutsPanel, BorderLayout.LINE_START );
+				fc.addPropertyChangeListener( shortcutsPanel );
+			}
+		}
+	}
+
+	@Override
+	public void uninstallComponents( JFileChooser fc ) {
+		super.uninstallComponents( fc );
+
+		if( shortcutsPanel != null ) {
+			fc.removePropertyChangeListener( shortcutsPanel );
+			shortcutsPanel = null;
+		}
 	}
 
 	private void patchUI( JFileChooser fc ) {
@@ -192,6 +234,25 @@ public class FlatFileChooserUI
 		} catch( ArrayIndexOutOfBoundsException ex ) {
 			// ignore
 		}
+
+		// put north, center and south components into a new panel so that
+		// the shortcuts panel (at west) gets full height
+		LayoutManager layout = fc.getLayout();
+		if( layout instanceof BorderLayout ) {
+			BorderLayout borderLayout = (BorderLayout) layout;
+			borderLayout.setHgap( 8 );
+
+			Component north = borderLayout.getLayoutComponent( BorderLayout.NORTH );
+			Component center = borderLayout.getLayoutComponent( BorderLayout.CENTER );
+			Component south = borderLayout.getLayoutComponent( BorderLayout.SOUTH );
+			if( north != null && center != null && south != null ) {
+				JPanel p = new JPanel( new BorderLayout( 0, 11 ) );
+				p.add( north, BorderLayout.NORTH );
+				p.add( center, BorderLayout.CENTER );
+				p.add( south, BorderLayout.SOUTH );
+				fc.add( p, BorderLayout.CENTER );
+			}
+		}
 	}
 
 	@Override
@@ -250,9 +311,19 @@ public class FlatFileChooserUI
 		return p;
 	}
 
+	/** @since 2.3 */
+	protected FlatShortcutsPanel createShortcutsPanel( JFileChooser fc ) {
+		return new FlatShortcutsPanel( fc );
+	}
+
 	@Override
 	public Dimension getPreferredSize( JComponent c ) {
-		return UIScale.scale( super.getPreferredSize( c ) );
+		Dimension prefSize = super.getPreferredSize( c );
+		Dimension minSize = getMinimumSize( c );
+		int shortcutsPanelWidth = (shortcutsPanel != null) ? shortcutsPanel.getPreferredSize().width : 0;
+		return new Dimension(
+			Math.max( prefSize.width, minSize.width + shortcutsPanelWidth ),
+			Math.max( prefSize.height, minSize.height ) );
 	}
 
 	@Override
@@ -262,12 +333,23 @@ public class FlatFileChooserUI
 
 	@Override
 	public FileView getFileView( JFileChooser fc ) {
-		return fileView;
+		return doNotUseSystemIcons() ? super.getFileView( fc ) : fileView;
 	}
 
 	@Override
 	public void clearIconCache() {
-		fileView.clearIconCache();
+		if( doNotUseSystemIcons() )
+			super.clearIconCache();
+		else
+			fileView.clearIconCache();
+	}
+
+	private boolean doNotUseSystemIcons() {
+		// Java 17 32bit craches on Windows when using system icons
+		// fixed in Java 18+ (see https://bugs.openjdk.java.net/browse/JDK-8277299)
+		return SystemInfo.isWindows &&
+			SystemInfo.isX86 &&
+			(SystemInfo.isJava_17_orLater && !SystemInfo.isJava_18_orLater);
 	}
 
 	//---- class FlatFileView -------------------------------------------------
@@ -305,4 +387,234 @@ public class FlatFileChooserUI
 			return icon;
 		}
 	}
+
+	//---- class FlatShortcutsPanel -------------------------------------------
+
+	/** @since 2.3 */
+	public static class FlatShortcutsPanel
+		extends JToolBar
+		implements PropertyChangeListener
+	{
+		private final JFileChooser fc;
+
+		private final Dimension buttonSize;
+		private final Dimension iconSize;
+		private final Function<File[], File[]> filesFunction;
+		private final Function<File, String> displayNameFunction;
+		private final Function<File, Icon> iconFunction;
+
+		protected final File[] files;
+		protected final JToggleButton[] buttons;
+		protected final ButtonGroup buttonGroup;
+
+		@SuppressWarnings( "unchecked" )
+		public FlatShortcutsPanel( JFileChooser fc ) {
+			super( JToolBar.VERTICAL );
+			this.fc = fc;
+			setFloatable( false );
+
+			buttonSize = UIScale.scale( getUIDimension( "FileChooser.shortcuts.buttonSize", 84, 64 ) );
+			iconSize = getUIDimension( "FileChooser.shortcuts.iconSize", 32, 32 );
+
+			filesFunction = (Function<File[], File[]>) UIManager.get( "FileChooser.shortcuts.filesFunction" );
+			displayNameFunction = (Function<File, String>) UIManager.get( "FileChooser.shortcuts.displayNameFunction" );
+			iconFunction = (Function<File, Icon>) UIManager.get( "FileChooser.shortcuts.iconFunction" );
+
+			FileSystemView fsv = fc.getFileSystemView();
+			File[] files = getChooserShortcutPanelFiles( fsv );
+			if( filesFunction != null )
+				files = filesFunction.apply( files );
+			this.files = files;
+
+			// create toolbar buttons
+			buttons = new JToggleButton[files.length];
+			buttonGroup = new ButtonGroup();
+			for( int i = 0; i < files.length; i++ ) {
+				// wrap drive path
+				if( fsv.isFileSystemRoot( files[i] ) )
+					files[i] = fsv.createFileObject( files[i].getAbsolutePath() );
+
+				File file = files[i];
+				String name = getDisplayName( fsv, file );
+				Icon icon = getIcon( fsv, file );
+
+				// remove path from name
+				int lastSepIndex = name.lastIndexOf( File.separatorChar );
+				if( lastSepIndex >= 0 && lastSepIndex < name.length() - 1 )
+					name = name.substring( lastSepIndex + 1 );
+
+				// scale icon (if necessary)
+				if( icon instanceof ImageIcon )
+					icon = new ScaledImageIcon( (ImageIcon) icon, iconSize.width, iconSize.height );
+				else if( icon != null )
+					icon = new ShortcutIcon( icon, iconSize.width, iconSize.height );
+
+				// create button
+				JToggleButton button = createButton( name, icon );
+				button.addActionListener( e -> {
+					fc.setCurrentDirectory( file );
+				} );
+
+				add( button );
+				buttonGroup.add( button );
+				buttons[i] = button;
+			}
+
+			directoryChanged( fc.getCurrentDirectory() );
+		}
+
+		private Dimension getUIDimension( String key, int defaultWidth, int defaultHeight ) {
+			Dimension size = UIManager.getDimension( key );
+			if( size == null )
+				size = new Dimension( defaultWidth, defaultHeight );
+			return size;
+		}
+
+		protected JToggleButton createButton( String name, Icon icon ) {
+			JToggleButton button = new JToggleButton( name, icon );
+			button.setVerticalTextPosition( SwingConstants.BOTTOM );
+			button.setHorizontalTextPosition( SwingConstants.CENTER );
+			button.setAlignmentX( Component.CENTER_ALIGNMENT );
+			button.setIconTextGap( 0 );
+			button.setPreferredSize( buttonSize );
+			button.setMaximumSize( buttonSize );
+			return button;
+		}
+
+		protected File[] getChooserShortcutPanelFiles( FileSystemView fsv ) {
+			try {
+				if( SystemInfo.isJava_12_orLater ) {
+					Method m = fsv.getClass().getMethod( "getChooserShortcutPanelFiles" );
+					File[] files = (File[]) m.invoke( fsv );
+
+					// on macOS and Linux, files consists only of the user home directory
+					if( files.length == 1 && files[0].equals( new File( System.getProperty( "user.home" ) ) ) )
+						files = new File[0];
+
+					return files;
+				} else if( SystemInfo.isWindows ) {
+					Class<?> cls = Class.forName( "sun.awt.shell.ShellFolder" );
+					Method m = cls.getMethod( "get", String.class );
+					return (File[]) m.invoke( null, "fileChooserShortcutPanelFolders" );
+				}
+			} catch( IllegalAccessException ex ) {
+				// do not log because access may be denied via VM option '--illegal-access=deny'
+			} catch( Exception ex ) {
+				LoggingFacade.INSTANCE.logSevere( null, ex );
+			}
+
+			// fallback
+			return new File[0];
+		}
+
+		protected String getDisplayName( FileSystemView fsv, File file ) {
+			if( displayNameFunction != null ) {
+				String name = displayNameFunction.apply( file );
+				if( name != null )
+					return name;
+			}
+
+			return fsv.getSystemDisplayName( file );
+		}
+
+		protected Icon getIcon( FileSystemView fsv, File file ) {
+			if( iconFunction != null ) {
+				Icon icon = iconFunction.apply( file );
+				if( icon != null )
+					return icon;
+			}
+
+			// Java 17+ supports getting larger system icons
+			try {
+				if( SystemInfo.isJava_17_orLater ) {
+					Method m = fsv.getClass().getMethod( "getSystemIcon", File.class, int.class, int.class );
+					return (Icon) m.invoke( fsv, file, iconSize.width, iconSize.height );
+				} else if( iconSize.width > 16 || iconSize.height > 16 ) {
+					Class<?> cls = Class.forName( "sun.awt.shell.ShellFolder" );
+					if( cls.isInstance( file ) ) {
+						Method m = file.getClass().getMethod( "getIcon", boolean.class );
+						m.setAccessible( true );
+						Image image = (Image) m.invoke( file, true );
+						if( image != null )
+							return new ImageIcon( image );
+					}
+				}
+			} catch( IllegalAccessException ex ) {
+				// do not log because access may be denied via VM option '--illegal-access=deny'
+			} catch( Exception ex ) {
+				LoggingFacade.INSTANCE.logSevere( null, ex );
+			}
+
+			// get system icon in default size 16x16
+			return fsv.getSystemIcon( file );
+		}
+
+		protected void directoryChanged( File file ) {
+			if( file != null ) {
+				String absolutePath = file.getAbsolutePath();
+				for( int i = 0; i < files.length; i++ ) {
+					// also compare path because otherwise selecting "Documents"
+					// in "Look in" combobox would not select "Documents" shortcut item
+					if( files[i].equals( file ) || files[i].getAbsolutePath().equals( absolutePath ) ) {
+						buttons[i].setSelected( true );
+						return;
+					}
+				}
+			}
+
+			buttonGroup.clearSelection();
+		}
+
+		@Override
+		public void propertyChange( PropertyChangeEvent e ) {
+			switch( e.getPropertyName() ) {
+				case JFileChooser.DIRECTORY_CHANGED_PROPERTY:
+					directoryChanged( fc.getCurrentDirectory() );
+					break;
+			}
+		}
+	}
+
+	//---- class ShortcutIcon -------------------------------------------------
+
+	private static class ShortcutIcon
+		implements Icon
+	{
+		private final Icon icon;
+		private final int iconWidth;
+		private final int iconHeight;
+
+		ShortcutIcon( Icon icon, int iconWidth, int iconHeight ) {
+			this.icon = icon;
+			this.iconWidth = iconWidth;
+			this.iconHeight = iconHeight;
+		}
+
+		@Override
+		public void paintIcon( Component c, Graphics g, int x, int y ) {
+			Graphics2D g2 = (Graphics2D) g.create();
+			try {
+				// set rendering hint for the case that the icon is a bitmap (not used for vector icons)
+				g2.setRenderingHint( RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC );
+
+				double scale = (double) getIconWidth() / (double) icon.getIconWidth();
+				g2.translate( x, y );
+				g2.scale( scale, scale );
+
+				icon.paintIcon( c, g2, 0, 0 );
+			} finally {
+				g2.dispose();
+			}
+		}
+
+		@Override
+		public int getIconWidth() {
+			return UIScale.scale( iconWidth );
+		}
+
+		@Override
+		public int getIconHeight() {
+			return UIScale.scale( iconHeight );
+		}
+	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatFormattedTextFieldUI.java

@@ -39,11 +39,11 @@ import javax.swing.plaf.ComponentUI;
  *
  * <!-- FlatTextFieldUI -->
  *
- * @uiDefault TextComponent.arc							int
- * @uiDefault Component.focusWidth						int
  * @uiDefault Component.minimumWidth					int
  * @uiDefault Component.isIntelliJTheme					boolean
  * @uiDefault FormattedTextField.placeholderForeground	Color
+ * @uiDefault FormattedTextField.focusedBackground		Color	optional
+ * @uiDefault FormattedTextField.iconTextGap			int		optional, default is 4
  * @uiDefault TextComponent.selectAllOnFocusPolicy		String	never, once (default) or always
  * @uiDefault TextComponent.selectAllOnMouseClick		boolean
  *
@@ -60,4 +60,10 @@ public class FlatFormattedTextFieldUI
 	protected String getPropertyPrefix() {
 		return "FormattedTextField";
 	}
+
+	/** @since 2 */
+	@Override
+	String getStyleType() {
+		return "FormattedTextField";
+	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatInternalFrameTitlePane.java

@@ -21,6 +21,7 @@ import java.awt.Color;
 import java.awt.Dimension;
 import java.awt.Graphics;
 import java.awt.LayoutManager;
+import java.awt.Rectangle;
 import java.beans.PropertyChangeEvent;
 import java.beans.PropertyChangeListener;
 import javax.swing.BorderFactory;
@@ -146,6 +147,19 @@ public class FlatInternalFrameTitlePane
 		closeButton.setVisible( frame.isClosable() );
 	}
 
+	Rectangle getFrameIconBounds() {
+		Icon icon = titleLabel.getIcon();
+		if( icon == null )
+			return null;
+
+		int iconWidth = icon.getIconWidth();
+		int iconHeight = icon.getIconHeight();
+		boolean leftToRight = titleLabel.getComponentOrientation().isLeftToRight();
+		int x = titleLabel.getX() + (leftToRight ? 0 : (titleLabel.getWidth() - iconWidth));
+		int y = titleLabel.getY() + ((titleLabel.getHeight() - iconHeight) / 2);
+		return new Rectangle( x, y, iconWidth, iconHeight );
+	}
+
 	/**
 	 * Does nothing because FlatLaf internal frames do not have system menus.
 	 */
@@ -199,6 +213,13 @@ public class FlatInternalFrameTitlePane
 				case "componentOrientation":
 					applyComponentOrientation( frame.getComponentOrientation() );
 					break;
+
+				case "opaque":
+					// Do not invoke super.propertyChange() here because it always
+					// invokes repaint(), which would cause endless repainting.
+					// The opaque flag is temporary changed in FlatUIUtils.hasOpaqueBeenExplicitlySet(),
+					// invoked from FlatInternalFrameUI.update().
+					return;
 			}
 
 			super.propertyChange( e );

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatInternalFrameUI.java

@@ -22,12 +22,22 @@ import java.awt.Component;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
 import java.awt.Insets;
+import java.awt.Rectangle;
+import java.awt.event.MouseEvent;
+import java.beans.PropertyChangeListener;
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicBoolean;
 import javax.swing.JComponent;
 import javax.swing.JInternalFrame;
 import javax.swing.LookAndFeel;
 import javax.swing.UIManager;
+import javax.swing.event.MouseInputAdapter;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicInternalFrameUI;
+import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableBorder;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableUI;
+import com.formdev.flatlaf.util.LoggingFacade;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JInternalFrame}.
@@ -83,9 +93,13 @@ import javax.swing.plaf.basic.BasicInternalFrameUI;
  */
 public class FlatInternalFrameUI
 	extends BasicInternalFrameUI
+	implements StyleableUI
 {
 	protected FlatWindowResizer windowResizer;
 
+	private Map<String, Object> oldStyleValues;
+	private AtomicBoolean borderShared;
+
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatInternalFrameUI( (JInternalFrame) c );
 	}
@@ -101,6 +115,8 @@ public class FlatInternalFrameUI
 		LookAndFeel.installProperty( frame, "opaque", false );
 
 		windowResizer = createWindowResizer();
+
+		installStyle();
 	}
 
 	@Override
@@ -111,6 +127,9 @@ public class FlatInternalFrameUI
 			windowResizer.uninstall();
 			windowResizer = null;
 		}
+
+		oldStyleValues = null;
+		borderShared = null;
 	}
 
 	@Override
@@ -122,15 +141,80 @@ public class FlatInternalFrameUI
 		return new FlatWindowResizer.InternalFrameResizer( frame, this::getDesktopManager );
 	}
 
+	@Override
+	protected MouseInputAdapter createBorderListener( JInternalFrame w ) {
+		return new FlatBorderListener();
+	}
+
+	@Override
+	protected PropertyChangeListener createPropertyChangeListener() {
+		return FlatStylingSupport.createPropertyChangeListener( frame, this::installStyle,
+			super.createPropertyChangeListener() );
+	}
+
+	/** @since 2 */
+	protected void installStyle() {
+		try {
+			applyStyle( FlatStylingSupport.getResolvedStyle( frame, "InternalFrame" ) );
+		} catch( RuntimeException ex ) {
+			LoggingFacade.INSTANCE.logSevere( null, ex );
+		}
+	}
+
+	/** @since 2 */
+	protected void applyStyle( Object style ) {
+		oldStyleValues = FlatStylingSupport.parseAndApply( oldStyleValues, style, this::applyStyleProperty );
+	}
+
+	/** @since 2 */
+	protected Object applyStyleProperty( String key, Object value ) {
+		if( borderShared == null )
+			borderShared = new AtomicBoolean( true );
+		return FlatStylingSupport.applyToAnnotatedObjectOrBorder( this, key, value, frame, borderShared );
+	}
+
+	/** @since 2 */
+	@Override
+	public Map<String, Class<?>> getStyleableInfos( JComponent c ) {
+		return FlatStylingSupport.getAnnotatedStyleableInfos( this, frame.getBorder() );
+	}
+
+	/** @since 2.5 */
+	@Override
+	public Object getStyleableValue( JComponent c, String key ) {
+		return FlatStylingSupport.getAnnotatedStyleableValue( this, frame.getBorder(), key );
+	}
+
+	@Override
+	public void update( Graphics g, JComponent c ) {
+		// The internal frame actually should be opaque and fill its background,
+		// but it must be non-opaque to allow translucent resize handles (outside of visual bounds).
+		// To avoid that parent may shine through internal frame (e.g. if menu bar is non-opaque),
+		// fill background excluding insets (translucent resize handles),
+		// but only if opaque was not set explicitly by application to false.
+		// If applications has set internal frame opacity to false, do not fill background (for compatibility).
+		if( !c.isOpaque() && !FlatUIUtils.hasOpaqueBeenExplicitlySet( c ) ) {
+			Insets insets = c.getInsets();
+
+			g.setColor( c.getBackground() );
+			g.fillRect( insets.left, insets.top,
+				c.getWidth() - insets.left - insets.right,
+				c.getHeight() - insets.top - insets.bottom );
+		}
+
+		super.update( g, c );
+	}
+
 	//---- class FlatInternalFrameBorder --------------------------------------
 
 	public static class FlatInternalFrameBorder
 		extends FlatEmptyBorder
+		implements StyleableBorder
 	{
-		private final Color activeBorderColor = UIManager.getColor( "InternalFrame.activeBorderColor" );
-		private final Color inactiveBorderColor = UIManager.getColor( "InternalFrame.inactiveBorderColor" );
-		private final int borderLineWidth = FlatUIUtils.getUIInt( "InternalFrame.borderLineWidth", 1 );
-		private final boolean dropShadowPainted = UIManager.getBoolean( "InternalFrame.dropShadowPainted" );
+		@Styleable protected Color activeBorderColor = UIManager.getColor( "InternalFrame.activeBorderColor" );
+		@Styleable protected Color inactiveBorderColor = UIManager.getColor( "InternalFrame.inactiveBorderColor" );
+		@Styleable protected int borderLineWidth = FlatUIUtils.getUIInt( "InternalFrame.borderLineWidth", 1 );
+		@Styleable protected boolean dropShadowPainted = UIManager.getBoolean( "InternalFrame.dropShadowPainted" );
 
 		private final FlatDropShadowBorder activeDropShadowBorder = new FlatDropShadowBorder(
 			UIManager.getColor( "InternalFrame.activeDropShadowColor" ),
@@ -145,6 +229,53 @@ public class FlatInternalFrameUI
 			super( UIManager.getInsets( "InternalFrame.borderMargins" ) );
 		}
 
+		@Override
+		public Object applyStyleProperty( String key, Object value ) {
+			switch( key ) {
+				case "borderMargins": return applyStyleProperty( (Insets) value );
+
+				case "activeDropShadowColor": return activeDropShadowBorder.applyStyleProperty( "shadowColor", value );
+				case "activeDropShadowInsets": return activeDropShadowBorder.applyStyleProperty( "shadowInsets", value );
+				case "activeDropShadowOpacity": return activeDropShadowBorder.applyStyleProperty( "shadowOpacity", value );
+				case "inactiveDropShadowColor": return inactiveDropShadowBorder.applyStyleProperty( "shadowColor", value );
+				case "inactiveDropShadowInsets": return inactiveDropShadowBorder.applyStyleProperty( "shadowInsets", value );
+				case "inactiveDropShadowOpacity": return inactiveDropShadowBorder.applyStyleProperty( "shadowOpacity", value );
+			}
+
+			return FlatStylingSupport.applyToAnnotatedObject( this, key, value );
+		}
+
+		@Override
+		public Map<String, Class<?>> getStyleableInfos() {
+			Map<String, Class<?>> infos = new FlatStylingSupport.StyleableInfosMap<>();
+			FlatStylingSupport.collectAnnotatedStyleableInfos( this, infos );
+			infos.put( "borderMargins", Insets.class );
+			infos.put( "activeDropShadowColor", Color.class );
+			infos.put( "activeDropShadowInsets", Insets.class );
+			infos.put( "activeDropShadowOpacity", float.class );
+			infos.put( "inactiveDropShadowColor", Color.class );
+			infos.put( "inactiveDropShadowInsets", Insets.class );
+			infos.put( "inactiveDropShadowOpacity", float.class );
+			return infos;
+		}
+
+		/** @since 2.5 */
+		@Override
+		public Object getStyleableValue( String key ) {
+			switch( key ) {
+				case "borderMargins": return getStyleableValue();
+
+				case "activeDropShadowColor": return activeDropShadowBorder.getStyleableValue( "shadowColor" );
+				case "activeDropShadowInsets": return activeDropShadowBorder.getStyleableValue( "shadowInsets" );
+				case "activeDropShadowOpacity": return activeDropShadowBorder.getStyleableValue( "shadowOpacity" );
+				case "inactiveDropShadowColor": return inactiveDropShadowBorder.getStyleableValue( "shadowColor" );
+				case "inactiveDropShadowInsets": return inactiveDropShadowBorder.getStyleableValue( "shadowInsets" );
+				case "inactiveDropShadowOpacity": return inactiveDropShadowBorder.getStyleableValue( "shadowOpacity" );
+			}
+
+			return FlatStylingSupport.getAnnotatedStyleableValue( this, key );
+		}
+
 		@Override
 		public Insets getBorderInsets( Component c, Insets insets ) {
 			if( c instanceof JInternalFrame && ((JInternalFrame)c).isMaximum() ) {
@@ -195,4 +326,27 @@ public class FlatInternalFrameUI
 			}
 		}
 	}
+
+	//---- class FlatBorderListener -------------------------------------------
+
+	/** @since 1.6 */
+	protected class FlatBorderListener
+		extends BorderListener
+	{
+		@Override
+		public void mouseClicked( MouseEvent e ) {
+			if( e.getClickCount() == 2 && !frame.isIcon() &&
+				e.getSource() instanceof FlatInternalFrameTitlePane )
+			{
+				Rectangle iconBounds = ((FlatInternalFrameTitlePane)e.getSource()).getFrameIconBounds();
+				if( iconBounds != null && iconBounds.contains( e.getX(), e.getY() ) ) {
+					if( frame.isClosable() )
+						frame.doDefaultCloseAction();
+					return;
+				}
+			}
+
+			super.mouseClicked( e );
+		}
+	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatLabelUI.java

@@ -24,6 +24,7 @@ import java.awt.Rectangle;
 import java.beans.PropertyChangeEvent;
 import java.util.Arrays;
 import java.util.HashSet;
+import java.util.Map;
 import java.util.Set;
 import javax.swing.Icon;
 import javax.swing.JComponent;
@@ -33,8 +34,12 @@ import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicHTML;
 import javax.swing.plaf.basic.BasicLabelUI;
+import com.formdev.flatlaf.FlatClientProperties;
 import com.formdev.flatlaf.FlatLaf;
+import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableUI;
 import com.formdev.flatlaf.util.HiDPIUtils;
+import com.formdev.flatlaf.util.LoggingFacade;
 import com.formdev.flatlaf.util.UIScale;
 
 /**
@@ -54,13 +59,30 @@ import com.formdev.flatlaf.util.UIScale;
  */
 public class FlatLabelUI
 	extends BasicLabelUI
+	implements StyleableUI
 {
-	private Color disabledForeground;
+	@Styleable protected Color disabledForeground;
 
+	private final boolean shared;
 	private boolean defaults_initialized = false;
+	private Map<String, Object> oldStyleValues;
 
 	public static ComponentUI createUI( JComponent c ) {
-		return FlatUIUtils.createSharedUI( FlatLabelUI.class, FlatLabelUI::new );
+		return FlatUIUtils.canUseSharedUI( c )
+			? FlatUIUtils.createSharedUI( FlatLabelUI.class, () -> new FlatLabelUI( true ) )
+			: new FlatLabelUI( false );
+	}
+
+	/** @since 2 */
+	protected FlatLabelUI( boolean shared ) {
+		this.shared = shared;
+	}
+
+	@Override
+	public void installUI( JComponent c ) {
+		super.installUI( c );
+
+		installStyle( (JLabel) c );
 	}
 
 	@Override
@@ -77,7 +99,9 @@ public class FlatLabelUI
 	@Override
 	protected void uninstallDefaults( JLabel c ) {
 		super.uninstallDefaults( c );
+
 		defaults_initialized = false;
+		oldStyleValues = null;
 	}
 
 	@Override
@@ -94,10 +118,52 @@ public class FlatLabelUI
 		if( name == "text" || name == "font" || name == "foreground" ) {
 			JLabel label = (JLabel) e.getSource();
 			updateHTMLRenderer( label, label.getText(), true );
+		} else if( name.equals( FlatClientProperties.STYLE ) || name.equals( FlatClientProperties.STYLE_CLASS ) ) {
+			JLabel label = (JLabel) e.getSource();
+			if( shared && FlatStylingSupport.hasStyleProperty( label ) ) {
+				// unshare component UI if necessary
+				// updateUI() invokes installStyle() from installUI()
+				label.updateUI();
+			} else
+				installStyle( label );
+			label.revalidate();
+			label.repaint();
 		} else
 			super.propertyChange( e );
 	}
 
+	/** @since 2 */
+	protected void installStyle( JLabel c ) {
+		try {
+			applyStyle( c, FlatStylingSupport.getResolvedStyle( c, "Label" ) );
+		} catch( RuntimeException ex ) {
+			LoggingFacade.INSTANCE.logSevere( null, ex );
+		}
+	}
+
+	/** @since 2 */
+	protected void applyStyle( JLabel c, Object style ) {
+		oldStyleValues = FlatStylingSupport.parseAndApply( oldStyleValues, style,
+			(key, value) -> applyStyleProperty( c, key, value ) );
+	}
+
+	/** @since 2 */
+	protected Object applyStyleProperty( JLabel c, String key, Object value ) {
+		return FlatStylingSupport.applyToAnnotatedObjectOrComponent( this, c, key, value );
+	}
+
+	/** @since 2 */
+	@Override
+	public Map<String, Class<?>> getStyleableInfos( JComponent c ) {
+		return FlatStylingSupport.getAnnotatedStyleableInfos( this );
+	}
+
+	/** @since 2.5 */
+	@Override
+	public Object getStyleableValue( JComponent c, String key ) {
+		return FlatStylingSupport.getAnnotatedStyleableValue( this, key );
+	}
+
 	/**
 	 * Checks whether text contains HTML tags that use "absolute-size" keywords
 	 * (e.g. "x-large") for font-size in default style sheet

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatLineBorder.java

@@ -37,15 +37,18 @@ public class FlatLineBorder
 {
 	private final Color lineColor;
 	private final float lineThickness;
+	/** @since 2 */ private final int arc;
 
 	public FlatLineBorder( Insets insets, Color lineColor ) {
-		this( insets, lineColor, 1f );
+		this( insets, lineColor, 1f, 0 );
 	}
 
-	public FlatLineBorder( Insets insets, Color lineColor, float lineThickness ) {
+	/** @since 2 */
+	public FlatLineBorder( Insets insets, Color lineColor, float lineThickness, int arc ) {
 		super( insets );
 		this.lineColor = lineColor;
 		this.lineThickness = lineThickness;
+		this.arc = arc;
 	}
 
 	public Color getLineColor() {
@@ -56,13 +59,18 @@ public class FlatLineBorder
 		return lineThickness;
 	}
 
+	/** @since 2 */
+	public int getArc() {
+		return arc;
+	}
+
 	@Override
 	public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
 		Graphics2D g2 = (Graphics2D) g.create();
 		try {
 			FlatUIUtils.setRenderingHints( g2 );
-			g2.setColor( lineColor );
-			FlatUIUtils.paintComponentBorder( g2, x, y, width, height, 0f, scale( lineThickness ), 0f );
+			FlatUIUtils.paintOutlinedComponent( g2, x, y, width, height,
+				0, 0, 0, scale( getLineThickness() ), scale( getArc() ), null, getLineColor(), null );
 		} finally {
 			g2.dispose();
 		}

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatListCellBorder.java

@@ -16,11 +16,15 @@
 
 package com.formdev.flatlaf.ui;
 
+import java.awt.Color;
 import java.awt.Component;
 import java.awt.Graphics;
+import java.awt.Insets;
+import java.util.function.Function;
 import javax.swing.JList;
 import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
+import javax.swing.plaf.ListUI;
 
 /**
  * Cell border for {@link javax.swing.DefaultListCellRenderer}
@@ -33,12 +37,54 @@ import javax.swing.UIManager;
 public class FlatListCellBorder
 	extends FlatLineBorder
 {
-	final boolean showCellFocusIndicator = UIManager.getBoolean( "List.showCellFocusIndicator" );
+	/** @since 2 */ protected boolean showCellFocusIndicator = UIManager.getBoolean( "List.showCellFocusIndicator" );
+
+	private Component c;
 
 	protected FlatListCellBorder() {
 		super( UIManager.getInsets( "List.cellMargins" ), UIManager.getColor( "List.cellFocusColor" ) );
 	}
 
+	@Override
+	public Insets getBorderInsets( Component c, Insets insets ) {
+		Insets m = getStyleFromListUI( c, ui -> ui.cellMargins );
+		if( m != null )
+			return scaleInsets( c, insets, m.top, m.left, m.bottom, m.right );
+
+		return super.getBorderInsets( c, insets );
+	}
+
+	@Override
+	public Color getLineColor() {
+		if( c != null ) {
+			Color color = getStyleFromListUI( c, ui -> ui.cellFocusColor );
+			if( color != null )
+				return color;
+		}
+		return super.getLineColor();
+	}
+
+	@Override
+	public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
+		this.c = c;
+		super.paintBorder( c, g, x, y, width, height );
+		this.c = null;
+	}
+
+	/**
+	 * Because this border is always shared for all lists,
+	 * get border specific style from FlatListUI.
+	 */
+	static <T> T getStyleFromListUI( Component c, Function<FlatListUI, T> f ) {
+		JList<?> list = (JList<?>) SwingUtilities.getAncestorOfClass( JList.class, c );
+		if( list != null ) {
+			ListUI ui = list.getUI();
+			if( ui instanceof FlatListUI )
+				return f.apply( (FlatListUI) ui );
+		}
+		return null;
+	}
+
 	//---- class Default ------------------------------------------------------
 
 	/**
@@ -67,17 +113,19 @@ public class FlatListCellBorder
 
 	/**
 	 * Border for selected cell that uses margins and paints focus indicator border
-	 * if enabled (List.showCellFocusIndicator=true) and exactly one item is selected.
+	 * if enabled (List.showCellFocusIndicator=true) and multiple items are selected.
 	 */
 	public static class Selected
 		extends FlatListCellBorder
 	{
 		@Override
 		public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
+			Boolean b = getStyleFromListUI( c, ui -> ui.showCellFocusIndicator );
+			boolean showCellFocusIndicator = (b != null) ? b : this.showCellFocusIndicator;
 			if( !showCellFocusIndicator )
 				return;
 
-			// paint focus indicator border only if exactly one item is selected
+			// paint focus indicator border only if multiple items are selected
 			JList<?> list = (JList<?>) SwingUtilities.getAncestorOfClass( JList.class, c );
 			if( list != null && list.getMinSelectionIndex() == list.getMaxSelectionIndex() )
 				return;

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatListUI.java

@@ -18,12 +18,19 @@ package com.formdev.flatlaf.ui;
 
 import java.awt.Color;
 import java.awt.EventQueue;
+import java.awt.Insets;
 import java.awt.event.FocusEvent;
 import java.awt.event.FocusListener;
+import java.beans.PropertyChangeListener;
+import java.util.Map;
 import javax.swing.JComponent;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicListUI;
+import com.formdev.flatlaf.FlatClientProperties;
+import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableUI;
+import com.formdev.flatlaf.util.LoggingFacade;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JList}.
@@ -63,16 +70,38 @@ import javax.swing.plaf.basic.BasicListUI;
  */
 public class FlatListUI
 	extends BasicListUI
+	implements StyleableUI
 {
-	protected Color selectionBackground;
-	protected Color selectionForeground;
-	protected Color selectionInactiveBackground;
-	protected Color selectionInactiveForeground;
+	@Styleable protected Color selectionBackground;
+	@Styleable protected Color selectionForeground;
+	@Styleable protected Color selectionInactiveBackground;
+	@Styleable protected Color selectionInactiveForeground;
+
+	// for FlatListCellBorder
+	/** @since 2 */ @Styleable protected Insets cellMargins;
+	/** @since 2 */ @Styleable protected Color cellFocusColor;
+	/** @since 2 */ @Styleable protected Boolean showCellFocusIndicator;
+
+	private Map<String, Object> oldStyleValues;
 
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatListUI();
 	}
 
+	@Override
+	public void installUI( JComponent c ) {
+		if( FlatUIUtils.needsLightAWTPeer( c ) )
+			FlatUIUtils.runWithLightAWTPeerUIDefaults( () -> installUIImpl( c ) );
+		else
+			installUIImpl( c );
+	}
+
+	private void installUIImpl( JComponent c ) {
+		super.installUI( c );
+
+		installStyle();
+	}
+
 	@Override
 	protected void installDefaults() {
 		super.installDefaults();
@@ -93,6 +122,8 @@ public class FlatListUI
 		selectionForeground = null;
 		selectionInactiveBackground = null;
 		selectionInactiveForeground = null;
+
+		oldStyleValues = null;
 	}
 
 	@Override
@@ -116,10 +147,85 @@ public class FlatListUI
 		};
 	}
 
+	@Override
+	protected PropertyChangeListener createPropertyChangeListener() {
+		PropertyChangeListener superListener = super.createPropertyChangeListener();
+		return e -> {
+			superListener.propertyChange( e );
+
+			switch( e.getPropertyName() ) {
+				case FlatClientProperties.COMPONENT_FOCUS_OWNER:
+					toggleSelectionColors();
+					break;
+
+				case FlatClientProperties.STYLE:
+				case FlatClientProperties.STYLE_CLASS:
+					installStyle();
+					list.revalidate();
+					list.repaint();
+					break;
+			}
+		};
+	}
+
+	/** @since 2 */
+	protected void installStyle() {
+		try {
+			applyStyle( FlatStylingSupport.getResolvedStyle( list, "List" ) );
+		} catch( RuntimeException ex ) {
+			LoggingFacade.INSTANCE.logSevere( null, ex );
+		}
+	}
+
+	/** @since 2 */
+	protected void applyStyle( Object style ) {
+		Color oldSelectionBackground = selectionBackground;
+		Color oldSelectionForeground = selectionForeground;
+		Color oldSelectionInactiveBackground = selectionInactiveBackground;
+		Color oldSelectionInactiveForeground = selectionInactiveForeground;
+
+		oldStyleValues = FlatStylingSupport.parseAndApply( oldStyleValues, style, this::applyStyleProperty );
+
+		// update selection background
+		if( selectionBackground != oldSelectionBackground ) {
+			Color selBg = list.getSelectionBackground();
+			if( selBg == oldSelectionBackground )
+				list.setSelectionBackground( selectionBackground );
+			else if( selBg == oldSelectionInactiveBackground )
+				list.setSelectionBackground( selectionInactiveBackground );
+		}
+
+		// update selection foreground
+		if( selectionForeground != oldSelectionForeground ) {
+			Color selFg = list.getSelectionForeground();
+			if( selFg == oldSelectionForeground )
+				list.setSelectionForeground( selectionForeground );
+			else if( selFg == oldSelectionInactiveForeground )
+				list.setSelectionForeground( selectionInactiveForeground );
+		}
+	}
+
+	/** @since 2 */
+	protected Object applyStyleProperty( String key, Object value ) {
+		return FlatStylingSupport.applyToAnnotatedObjectOrComponent( this, list, key, value );
+	}
+
+	/** @since 2 */
+	@Override
+	public Map<String, Class<?>> getStyleableInfos( JComponent c ) {
+		return FlatStylingSupport.getAnnotatedStyleableInfos( this );
+	}
+
+	/** @since 2.5 */
+	@Override
+	public Object getStyleableValue( JComponent c, String key ) {
+		return FlatStylingSupport.getAnnotatedStyleableValue( this, key );
+	}
+
 	/**
 	 * Toggle selection colors from focused to inactive and vice versa.
 	 *
-	 * This is not a optimal solution but much easier than rewriting the whole paint methods.
+	 * This is not an optimal solution but much easier than rewriting the whole paint methods.
 	 *
 	 * Using a LaF specific renderer was avoided because often a custom renderer is
 	 * already used in applications. Then either the inactive colors are not used,

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatMarginBorder.java

@@ -29,7 +29,7 @@ import javax.swing.plaf.basic.BasicBorders;
 public class FlatMarginBorder
 	extends BasicBorders.MarginBorder
 {
-	private final int left, right, top, bottom;
+	protected int left, right, top, bottom;
 
 	public FlatMarginBorder() {
 		left = right = top = bottom = 0;

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatMenuBarBorder.java

@@ -21,8 +21,11 @@ import java.awt.Color;
 import java.awt.Component;
 import java.awt.Graphics;
 import java.awt.Insets;
+import java.util.Map;
 import javax.swing.JMenuBar;
 import javax.swing.UIManager;
+import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableBorder;
 
 /**
  * Border for {@link javax.swing.JMenuBar}.
@@ -33,11 +36,32 @@ import javax.swing.UIManager;
  */
 public class FlatMenuBarBorder
 	extends FlatMarginBorder
+	implements StyleableBorder
 {
-	private final Color borderColor = UIManager.getColor( "MenuBar.borderColor" );
+	@Styleable protected Color borderColor = UIManager.getColor( "MenuBar.borderColor" );
+
+	/** @since 2 */
+	@Override
+	public Object applyStyleProperty( String key, Object value ) {
+		return FlatStylingSupport.applyToAnnotatedObject( this, key, value );
+	}
+
+	@Override
+	public Map<String, Class<?>> getStyleableInfos() {
+		return FlatStylingSupport.getAnnotatedStyleableInfos( this );
+	}
+
+	/** @since 2.5 */
+	@Override
+	public Object getStyleableValue( String key ) {
+		return FlatStylingSupport.getAnnotatedStyleableValue( this, key );
+	}
 
 	@Override
 	public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
+		if( !showBottomSeparator( c ) )
+			return;
+
 		float lineHeight = scale( (float) 1 );
 		FlatUIUtils.paintFilledRectangle( g, borderColor, x, y + height - lineHeight, width, lineHeight );
 	}
@@ -53,4 +77,9 @@ public class FlatMenuBarBorder
 		insets.right = scale( margin.right );
 		return insets;
 	}
+
+	/** @since 2 */
+	protected boolean showBottomSeparator( Component c ) {
+		return !FlatMenuBarUI.useUnifiedBackground( c );
+	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatMenuBarUI.java

@@ -16,10 +16,20 @@
 
 package com.formdev.flatlaf.ui;
 
+import java.awt.Color;
+import java.awt.Component;
+import java.awt.Container;
 import java.awt.Graphics;
+import java.awt.Insets;
+import java.awt.LayoutManager;
+import java.awt.Window;
 import java.awt.event.ActionEvent;
+import java.beans.PropertyChangeListener;
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicBoolean;
 import javax.swing.AbstractAction;
 import javax.swing.ActionMap;
+import javax.swing.BoxLayout;
 import javax.swing.JComponent;
 import javax.swing.JMenu;
 import javax.swing.JMenuBar;
@@ -33,8 +43,13 @@ import javax.swing.plaf.ActionMapUIResource;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicMenuBarUI;
+import javax.swing.plaf.basic.DefaultMenuLayout;
 import com.formdev.flatlaf.FlatLaf;
+import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableUI;
+import com.formdev.flatlaf.util.LoggingFacade;
 import com.formdev.flatlaf.util.SystemInfo;
+import com.formdev.flatlaf.util.UIScale;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JMenuBar}.
@@ -45,14 +60,31 @@ import com.formdev.flatlaf.util.SystemInfo;
  * @uiDefault MenuBar.background						Color
  * @uiDefault MenuBar.foreground						Color
  * @uiDefault MenuBar.border							Border
+ *
+ * <!-- FlatMenuBarUI -->
+ *
  * @uiDefault TitlePane.unifiedBackground				boolean
  *
  * @author Karl Tauber
  */
 public class FlatMenuBarUI
 	extends BasicMenuBarUI
+	implements StyleableUI
 {
-	protected boolean unifiedBackground;
+	// used in FlatMenuItemBorder
+	/** @since 2 */ @Styleable protected Insets itemMargins;
+
+	// used in FlatMenuUI
+	/** @since 2 */ @Styleable protected Color hoverBackground;
+	/** @since 2.5 */ @Styleable protected Color selectionBackground;
+	/** @since 2.5 */ @Styleable protected Color selectionForeground;
+	/** @since 2 */ @Styleable protected Color underlineSelectionBackground;
+	/** @since 2 */ @Styleable protected Color underlineSelectionColor;
+	/** @since 2 */ @Styleable protected int underlineSelectionHeight = -1;
+
+	private PropertyChangeListener propertyChangeListener;
+	private Map<String, Object> oldStyleValues;
+	private AtomicBoolean borderShared;
 
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatMenuBarUI();
@@ -63,13 +95,46 @@ public class FlatMenuBarUI
 	 *          Do not add any functionality here.
 	 */
 
+	@Override
+	public void installUI( JComponent c ) {
+		super.installUI( c );
+
+		installStyle();
+	}
+
 	@Override
 	protected void installDefaults() {
 		super.installDefaults();
 
 		LookAndFeel.installProperty( menuBar, "opaque", false );
 
-		unifiedBackground = UIManager.getBoolean( "TitlePane.unifiedBackground" );
+		LayoutManager layout = menuBar.getLayout();
+		if( layout == null || layout instanceof UIResource )
+			menuBar.setLayout( new FlatMenuBarLayout( menuBar ) );
+	}
+
+	@Override
+	protected void uninstallDefaults() {
+		super.uninstallDefaults();
+
+		oldStyleValues = null;
+		borderShared = null;
+	}
+
+	@Override
+	protected void installListeners() {
+		super.installListeners();
+
+		propertyChangeListener = FlatStylingSupport.createPropertyChangeListener( menuBar, this::installStyle, null );
+		menuBar.addPropertyChangeListener( propertyChangeListener );
+	}
+
+	@Override
+	protected void uninstallListeners() {
+		super.uninstallListeners();
+
+		menuBar.removePropertyChangeListener( propertyChangeListener );
+		propertyChangeListener = null;
 	}
 
 	@Override
@@ -84,33 +149,217 @@ public class FlatMenuBarUI
 		map.put( "takeFocus", new TakeFocus() );
 	}
 
+	/** @since 2 */
+	protected void installStyle() {
+		try {
+			applyStyle( FlatStylingSupport.getResolvedStyle( menuBar, "MenuBar" ) );
+		} catch( RuntimeException ex ) {
+			LoggingFacade.INSTANCE.logSevere( null, ex );
+		}
+	}
+
+	/** @since 2 */
+	protected void applyStyle( Object style ) {
+		oldStyleValues = FlatStylingSupport.parseAndApply( oldStyleValues, style, this::applyStyleProperty );
+	}
+
+	/** @since 2 */
+	protected Object applyStyleProperty( String key, Object value ) {
+		if( borderShared == null )
+			borderShared = new AtomicBoolean( true );
+		return FlatStylingSupport.applyToAnnotatedObjectOrBorder( this, key, value, menuBar, borderShared );
+	}
+
+	/** @since 2 */
+	@Override
+	public Map<String, Class<?>> getStyleableInfos( JComponent c ) {
+		return FlatStylingSupport.getAnnotatedStyleableInfos( this, menuBar.getBorder() );
+	}
+
+	/** @since 2.5 */
+	@Override
+	public Object getStyleableValue( JComponent c, String key ) {
+		return FlatStylingSupport.getAnnotatedStyleableValue( this, menuBar.getBorder(), key );
+	}
+
 	@Override
 	public void update( Graphics g, JComponent c ) {
-		// do not fill background if menubar is embedded into title pane
-		if( isFillBackground( c ) ) {
-			g.setColor( c.getBackground() );
+		// paint background
+		Color background = getBackground( c );
+		if( background != null ) {
+			g.setColor( background );
 			g.fillRect( 0, 0, c.getWidth(), c.getHeight() );
 		}
 
 		paint( g, c );
 	}
 
-	protected boolean isFillBackground( JComponent c ) {
-		// paint background in opaque or having custom background color
-		if( c.isOpaque() || !(c.getBackground() instanceof UIResource) )
-			return true;
+	protected Color getBackground( JComponent c ) {
+		Color background = c.getBackground();
 
-		// do not paint background for unified title pane
-		if( unifiedBackground )
-			return false;
+		// paint background if opaque
+		if( c.isOpaque() )
+			return background;
+
+		// do not paint background if non-opaque and having custom background color
+		if( !(background instanceof UIResource) )
+			return null;
+
+		// paint background if menu bar is not the "main" menu bar (e.g. in internal frame)
+		JRootPane rootPane = SwingUtilities.getRootPane( c );
+		if( rootPane == null || !(rootPane.getParent() instanceof Window) || rootPane.getJMenuBar() != c )
+			return background;
+
+		// use parent background for unified title pane
+		if( useUnifiedBackground( c ) )
+			background = FlatUIUtils.getParentBackground( c );
 
 		// paint background in full screen mode
-		JRootPane rootPane = SwingUtilities.getRootPane( c );
-		if( rootPane == null || FlatUIUtils.isFullScreen( rootPane ) )
-			return true;
+		if( FlatUIUtils.isFullScreen( rootPane ) )
+			return background;
 
 		// do not paint background if menu bar is embedded into title pane
-		return rootPane.getJMenuBar() != c || !FlatRootPaneUI.isMenuBarEmbedded( rootPane );
+		return FlatRootPaneUI.isMenuBarEmbedded( rootPane ) ? null : background;
+	}
+
+	/**@since 2 */
+	static boolean useUnifiedBackground( Component c ) {
+		// check whether:
+		// - TitlePane.unifiedBackground is true and
+		// - menu bar is the "main" menu bar and
+		// - window root pane has custom decoration style
+
+		JRootPane rootPane;
+		// (not storing value of "TitlePane.unifiedBackground" in class to allow changing at runtime)
+		return UIManager.getBoolean( "TitlePane.unifiedBackground" ) &&
+			(rootPane = SwingUtilities.getRootPane( c )) != null &&
+			rootPane.getParent() instanceof Window &&
+			rootPane.getJMenuBar() == c &&
+			rootPane.getWindowDecorationStyle() != JRootPane.NONE;
+	}
+
+	//---- class FlatMenuBarLayout --------------------------------------------
+
+	/**
+	 * @since 2.4
+	 */
+	protected static class FlatMenuBarLayout
+		extends DefaultMenuLayout
+	{
+		public FlatMenuBarLayout( Container target ) {
+			super( target, BoxLayout.LINE_AXIS );
+		}
+
+		@Override
+		public void layoutContainer( Container target ) {
+			super.layoutContainer( target );
+
+
+			// The only purpose of the code below is to make sure that a horizontal glue,
+			// which can be used to move window and displays the window title in embedded menu bar,
+			// is always visible within the menu bar bounds and has a minimum width.
+			// If this is not the case, the horizontal glue is made larger and
+			// components that are on the left side of the glue are made smaller.
+
+
+			// get root pane and check whether this menu bar is the root pane menu bar
+			JRootPane rootPane = SwingUtilities.getRootPane( target );
+			if( rootPane == null || rootPane.getJMenuBar() != target )
+				return;
+
+			// get title pane and check whether menu bar is embedded
+			FlatTitlePane titlePane = FlatRootPaneUI.getTitlePane( rootPane );
+			if( titlePane == null || !titlePane.isMenuBarEmbedded() )
+				return;
+
+			// check whether there is a horizontal glue (used for window title in embedded menu bar)
+			// and check minimum width of horizontal glue
+			Component horizontalGlue = titlePane.findHorizontalGlue( (JMenuBar) target );
+			int minTitleWidth = UIScale.scale( titlePane.titleMinimumWidth );
+			if( horizontalGlue != null && horizontalGlue.getWidth() < minTitleWidth ) {
+				// get index of glue component
+				int glueIndex = -1;
+				Component[] components = target.getComponents();
+				for( int i = components.length - 1; i >= 0; i-- ) {
+					if( components[i] == horizontalGlue ) {
+						glueIndex = i;
+						break;
+					}
+				}
+				if( glueIndex < 0 )
+					return; // should never happen
+
+				if( target.getComponentOrientation().isLeftToRight() ) {
+					// left-to-right
+
+					// make horizontal glue wider (minimum title width)
+					int offset = minTitleWidth - horizontalGlue.getWidth();
+					horizontalGlue.setSize( minTitleWidth, horizontalGlue.getHeight() );
+
+					// check whether glue is fully visible
+					int minGlueX = target.getWidth() - target.getInsets().right - minTitleWidth;
+					if( minGlueX < horizontalGlue.getX() ) {
+						// move glue to the left to make it fully visible
+						offset -= (horizontalGlue.getX() - minGlueX);
+						horizontalGlue.setLocation( minGlueX, horizontalGlue.getY() );
+
+						// shrink and move components that are on the left side of the glue
+						for( int i = glueIndex - 1; i >= 0; i-- ) {
+							Component c = components[i];
+							if( c.getX() > minGlueX ) {
+								// move component and set width to zero
+								c.setBounds( minGlueX, c.getY(), 0, c.getHeight() );
+							} else {
+								// reduce size of component
+								c.setSize( minGlueX - c.getX(), c.getHeight() );
+								break;
+							}
+						}
+					}
+
+					// move components that are on the right side of the glue
+					for( int i = glueIndex + 1; i < components.length; i++ ) {
+						Component c = components[i];
+						c.setLocation( c.getX() + offset, c.getY() );
+					}
+				} else {
+					// right-to-left
+
+					// make horizontal glue wider (minimum title width)
+					int offset = minTitleWidth - horizontalGlue.getWidth();
+					horizontalGlue.setBounds( horizontalGlue.getX() - offset, horizontalGlue.getY(),
+						minTitleWidth, horizontalGlue.getHeight() );
+
+					// check whether glue is fully visible
+					int minGlueX = target.getInsets().left;
+					if( minGlueX > horizontalGlue.getX() ) {
+						// move glue to the right to make it fully visible
+						offset -= (horizontalGlue.getX() - minGlueX);
+						horizontalGlue.setLocation( minGlueX, horizontalGlue.getY() );
+
+						// shrink and move components that are on the right side of the glue
+						int x = horizontalGlue.getX() + horizontalGlue.getWidth();
+						for( int i = glueIndex - 1; i >= 0; i-- ) {
+							Component c = components[i];
+							if( c.getX() + c.getWidth() < x ) {
+								// move component and set width to zero
+								c.setBounds( x, c.getY(), 0, c.getHeight() );
+							} else {
+								// move component and reduce size
+								c.setBounds( x, c.getY(), c.getWidth() - (x - c.getX()), c.getHeight() );
+								break;
+							}
+						}
+					}
+
+					// move components that are on the left side of the glue
+					for( int i = glueIndex + 1; i < components.length; i++ ) {
+						Component c = components[i];
+						c.setLocation( c.getX() - offset, c.getY() );
+					}
+				}
+			}
+		}
 	}
 
 	//---- class TakeFocus ----------------------------------------------------

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatMenuItemBorder.java

@@ -18,9 +18,11 @@ package com.formdev.flatlaf.ui;
 
 import static com.formdev.flatlaf.util.UIScale.scale;
 import java.awt.Component;
+import java.awt.Container;
 import java.awt.Insets;
 import javax.swing.JMenuBar;
 import javax.swing.UIManager;
+import javax.swing.plaf.MenuBarUI;
 
 /**
  * Border for {@link javax.swing.JMenu}, {@link javax.swing.JMenuItem},
@@ -33,15 +35,22 @@ import javax.swing.UIManager;
 public class FlatMenuItemBorder
 	extends FlatMarginBorder
 {
+	// only used if parent menubar is not an instance of FlatMenuBarUI
 	private final Insets menuBarItemMargins = UIManager.getInsets( "MenuBar.itemMargins" );
 
 	@Override
 	public Insets getBorderInsets( Component c, Insets insets ) {
-		if( c.getParent() instanceof JMenuBar ) {
-			insets.top = scale( menuBarItemMargins.top );
-			insets.left = scale( menuBarItemMargins.left );
-			insets.bottom = scale( menuBarItemMargins.bottom );
-			insets.right = scale( menuBarItemMargins.right );
+		Container parent = c.getParent();
+		if( parent instanceof JMenuBar ) {
+			// get margins from FlatMenuBarUI to allow styling
+			MenuBarUI ui = ((JMenuBar)parent).getUI();
+			Insets margins = (ui instanceof FlatMenuBarUI && ((FlatMenuBarUI)ui).itemMargins != null)
+				? ((FlatMenuBarUI)ui).itemMargins
+				: this.menuBarItemMargins;
+			insets.top = scale( margins.top );
+			insets.left = scale( margins.left );
+			insets.bottom = scale( margins.bottom );
+			insets.right = scale( margins.right );
 			return insets;
 		} else
 			return super.getBorderInsets( c, insets );

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatMenuItemRenderer.java

@@ -19,6 +19,7 @@ package com.formdev.flatlaf.ui;
 import static com.formdev.flatlaf.util.UIScale.scale;
 import java.awt.Color;
 import java.awt.Component;
+import java.awt.Container;
 import java.awt.Dimension;
 import java.awt.Font;
 import java.awt.FontMetrics;
@@ -30,7 +31,9 @@ import java.awt.Rectangle;
 import java.awt.event.InputEvent;
 import java.awt.event.KeyEvent;
 import java.text.AttributedCharacterIterator;
+import java.util.Map;
 import javax.swing.Icon;
+import javax.swing.JComponent;
 import javax.swing.JMenu;
 import javax.swing.JMenuItem;
 import javax.swing.KeyStroke;
@@ -38,7 +41,12 @@ import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
 import javax.swing.plaf.basic.BasicHTML;
 import javax.swing.text.View;
+import com.formdev.flatlaf.FlatClientProperties;
 import com.formdev.flatlaf.FlatLaf;
+import com.formdev.flatlaf.icons.FlatCheckBoxMenuItemIcon;
+import com.formdev.flatlaf.icons.FlatMenuArrowIcon;
+import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
+import com.formdev.flatlaf.ui.FlatStylingSupport.UnknownStyleException;
 import com.formdev.flatlaf.util.DerivedColor;
 import com.formdev.flatlaf.util.Graphics2DProxy;
 import com.formdev.flatlaf.util.HiDPIUtils;
@@ -47,43 +55,49 @@ import com.formdev.flatlaf.util.SystemInfo;
 /**
  * Renderer for menu items.
  *
+ * @uiDefault MenuItem.verticallyAlignText							boolean
  * @uiDefault MenuItem.minimumWidth									int
  * @uiDefault MenuItem.minimumIconSize								Dimension
  * @uiDefault MenuItem.textAcceleratorGap							int
  * @uiDefault MenuItem.textNoAcceleratorGap							int
  * @uiDefault MenuItem.acceleratorArrowGap							int
  * @uiDefault MenuItem.checkBackground								Color
+ * @uiDefault MenuItem.checkMargins									Insets
+ * @uiDefault MenuItem.selectionType								String	null (default) or underline
  * @uiDefault MenuItem.underlineSelectionBackground					Color
  * @uiDefault MenuItem.underlineSelectionCheckBackground			Color
  * @uiDefault MenuItem.underlineSelectionColor						Color
  * @uiDefault MenuItem.underlineSelectionHeight						int
- * @uiDefault MenuItem.selectionBackground							Color
  *
  * @author Karl Tauber
  */
 public class FlatMenuItemRenderer
 {
+	private static final String KEY_MAX_ICONS_WIDTH = "FlatLaf.internal.FlatMenuItemRenderer.maxIconWidth";
+
 	protected final JMenuItem menuItem;
-	protected final Icon checkIcon;
-	protected final Icon arrowIcon;
-	protected final Font acceleratorFont;
+	protected Icon checkIcon;
+	protected Icon arrowIcon;
+	@Styleable protected Font acceleratorFont;
 	protected final String acceleratorDelimiter;
 
-	protected final int minimumWidth = UIManager.getInt( "MenuItem.minimumWidth" );
-	protected final Dimension minimumIconSize;
-	protected final int textAcceleratorGap = FlatUIUtils.getUIInt( "MenuItem.textAcceleratorGap", 28 );
-	protected final int textNoAcceleratorGap = FlatUIUtils.getUIInt( "MenuItem.textNoAcceleratorGap", 6 );
-	protected final int acceleratorArrowGap = FlatUIUtils.getUIInt( "MenuItem.acceleratorArrowGap", 2 );
+	/** @since 2 */ @Styleable protected boolean verticallyAlignText = FlatUIUtils.getUIBoolean( "MenuItem.verticallyAlignText", true );
+	@Styleable protected int minimumWidth = UIManager.getInt( "MenuItem.minimumWidth" );
+	@Styleable protected Dimension minimumIconSize;
+	@Styleable protected int textAcceleratorGap = FlatUIUtils.getUIInt( "MenuItem.textAcceleratorGap", 28 );
+	@Styleable protected int textNoAcceleratorGap = FlatUIUtils.getUIInt( "MenuItem.textNoAcceleratorGap", 6 );
+	@Styleable protected int acceleratorArrowGap = FlatUIUtils.getUIInt( "MenuItem.acceleratorArrowGap", 2 );
 
-	protected final Color checkBackground = UIManager.getColor( "MenuItem.checkBackground" );
-	protected final Insets checkMargins = UIManager.getInsets( "MenuItem.checkMargins" );
+	@Styleable protected Color checkBackground = UIManager.getColor( "MenuItem.checkBackground" );
+	@Styleable protected Insets checkMargins = UIManager.getInsets( "MenuItem.checkMargins" );
 
-	protected final Color underlineSelectionBackground = UIManager.getColor( "MenuItem.underlineSelectionBackground" );
-	protected final Color underlineSelectionCheckBackground = UIManager.getColor( "MenuItem.underlineSelectionCheckBackground" );
-	protected final Color underlineSelectionColor = UIManager.getColor( "MenuItem.underlineSelectionColor" );
-	protected final int underlineSelectionHeight = UIManager.getInt( "MenuItem.underlineSelectionHeight" );
+	@Styleable protected Color underlineSelectionBackground = UIManager.getColor( "MenuItem.underlineSelectionBackground" );
+	@Styleable protected Color underlineSelectionCheckBackground = UIManager.getColor( "MenuItem.underlineSelectionCheckBackground" );
+	@Styleable protected Color underlineSelectionColor = UIManager.getColor( "MenuItem.underlineSelectionColor" );
+	@Styleable protected int underlineSelectionHeight = UIManager.getInt( "MenuItem.underlineSelectionHeight" );
 
-	protected final Color selectionBackground = UIManager.getColor( "MenuItem.selectionBackground" );
+	private boolean iconsShared = true;
+	private final Font menuFont = UIManager.getFont( "Menu.font" );
 
 	protected FlatMenuItemRenderer( JMenuItem menuItem, Icon checkIcon, Icon arrowIcon,
 		Font acceleratorFont, String acceleratorDelimiter )
@@ -98,6 +112,77 @@ public class FlatMenuItemRenderer
 		this.minimumIconSize = (minimumIconSize != null) ? minimumIconSize : new Dimension( 16, 16 );
 	}
 
+	/** @since 2 */
+	protected Object applyStyleProperty( String key, Object value ) {
+		// style icon
+		if( key.startsWith( "icon." ) || key.equals( "selectionForeground" ) ) {
+			if( iconsShared ) {
+				if( checkIcon instanceof FlatCheckBoxMenuItemIcon )
+					checkIcon = FlatStylingSupport.cloneIcon( checkIcon );
+				if( arrowIcon instanceof FlatMenuArrowIcon )
+					arrowIcon = FlatStylingSupport.cloneIcon( arrowIcon );
+				iconsShared = false;
+			}
+
+			if( key.startsWith( "icon." ) ) {
+				String key2 = key.substring( "icon.".length() );
+
+				try {
+					if( checkIcon instanceof FlatCheckBoxMenuItemIcon )
+						return ((FlatCheckBoxMenuItemIcon)checkIcon).applyStyleProperty( key2, value );
+				} catch ( UnknownStyleException ex ) {
+					// ignore
+				}
+
+				try {
+					if( arrowIcon instanceof FlatMenuArrowIcon )
+						return ((FlatMenuArrowIcon)arrowIcon).applyStyleProperty( key2, value );
+				} catch ( UnknownStyleException ex ) {
+					// ignore
+				}
+
+				// keys with prefix "icon." are only for icons
+				throw new UnknownStyleException( key );
+			} else if( key.equals( "selectionForeground" ) ) {
+				// special case: same key is used in icons and in menuitem
+				if( checkIcon instanceof FlatCheckBoxMenuItemIcon )
+					((FlatCheckBoxMenuItemIcon)checkIcon).applyStyleProperty( key, value );
+				if( arrowIcon instanceof FlatMenuArrowIcon )
+					((FlatMenuArrowIcon)arrowIcon).applyStyleProperty( key, value );
+
+				// throw exception because the caller should also apply this key
+				throw new UnknownStyleException( key );
+			}
+		}
+
+		return FlatStylingSupport.applyToAnnotatedObject( this, key, value );
+	}
+
+	/** @since 2 */
+	public Map<String, Class<?>> getStyleableInfos() {
+		Map<String, Class<?>> infos = FlatStylingSupport.getAnnotatedStyleableInfos( this );
+		if( checkIcon instanceof FlatCheckBoxMenuItemIcon )
+			FlatStylingSupport.putAllPrefixKey( infos, "icon.", ((FlatCheckBoxMenuItemIcon)checkIcon).getStyleableInfos() );
+		infos.remove( "icon.selectionForeground" );
+		if( arrowIcon instanceof FlatMenuArrowIcon )
+			FlatStylingSupport.putAllPrefixKey( infos, "icon.", ((FlatMenuArrowIcon)arrowIcon).getStyleableInfos() );
+		infos.remove( "icon.selectionForeground" );
+		return infos;
+	}
+
+	/** @since 2.5 */
+	public Object getStyleableValue( String key ) {
+		if( key.startsWith( "icon." ) ) {
+			String key2 = key.substring( "icon.".length() );
+			if( checkIcon instanceof FlatCheckBoxMenuItemIcon )
+				return ((FlatCheckBoxMenuItemIcon)checkIcon).getStyleableValue( key2 );
+			if( arrowIcon instanceof FlatMenuArrowIcon )
+				return ((FlatMenuArrowIcon)arrowIcon).getStyleableValue( key2 );
+		}
+
+		return FlatStylingSupport.getAnnotatedStyleableValue( this, key );
+	}
+
 	protected Dimension getPreferredMenuItemSize() {
 		int width = 0;
 		int height = 0;
@@ -109,7 +194,8 @@ public class FlatMenuItemRenderer
 
 		// layout icon and text
 		SwingUtilities.layoutCompoundLabel( menuItem,
-			menuItem.getFontMetrics( menuItem.getFont() ), menuItem.getText(), getIconForLayout(),
+			menuItem.getFontMetrics( isTopLevelMenu ? getTopLevelFont() : menuItem.getFont() ),
+			menuItem.getText(), getIconForLayout(),
 			menuItem.getVerticalAlignment(), menuItem.getHorizontalAlignment(),
 			menuItem.getVerticalTextPosition(), menuItem.getHorizontalTextPosition(),
 			viewRect, iconRect, textRect, scale( menuItem.getIconTextGap() ) );
@@ -211,7 +297,8 @@ public class FlatMenuItemRenderer
 
 		// layout icon and text
 		SwingUtilities.layoutCompoundLabel( menuItem,
-			menuItem.getFontMetrics( menuItem.getFont() ), menuItem.getText(), getIconForLayout(),
+			menuItem.getFontMetrics( isTopLevelMenu ? getTopLevelFont() : menuItem.getFont() ),
+			menuItem.getText(), getIconForLayout(),
 			menuItem.getVerticalAlignment(), menuItem.getHorizontalAlignment(),
 			menuItem.getVerticalTextPosition(), menuItem.getHorizontalTextPosition(),
 			labelRect, iconRect, textRect, scale( menuItem.getIconTextGap() ) );
@@ -254,7 +341,7 @@ debug*/
 		paintBackground( g, underlineSelection ? underlineSelectionBackground : selectionBackground );
 		if( underlineSelection && isArmedOrSelected( menuItem ) )
 			paintUnderlineSelection( g, underlineSelectionColor, underlineSelectionHeight );
-		paintIcon( g, iconRect, getIconForPainting(), underlineSelection ? underlineSelectionCheckBackground : checkBackground );
+		paintIcon( g, iconRect, getIconForPainting(), underlineSelection ? underlineSelectionCheckBackground : checkBackground, selectionBackground );
 		paintText( g, textRect, menuItem.getText(), selectionForeground, disabledForeground );
 		paintAccelerator( g, accelRect, getAcceleratorText(), acceleratorForeground, acceleratorSelectionForeground, disabledForeground );
 		if( !isTopLevelMenu( menuItem ) )
@@ -301,7 +388,7 @@ debug*/
 		return FlatUIUtils.deriveColor( background, baseColor );
 	}
 
-	protected void paintIcon( Graphics g, Rectangle iconRect, Icon icon, Color checkBackground ) {
+	protected void paintIcon( Graphics g, Rectangle iconRect, Icon icon, Color checkBackground, Color selectionBackground ) {
 		// if checkbox/radiobutton menu item is selected and also has a custom icon,
 		// then use filled icon background to indicate selection (instead of using checkIcon)
 		if( menuItem.isSelected() && checkIcon != null && icon != checkIcon ) {
@@ -321,9 +408,10 @@ debug*/
 		}
 
 		int mnemonicIndex = FlatLaf.isShowMnemonics() ? menuItem.getDisplayedMnemonicIndex() : -1;
-		Color foreground = (isTopLevelMenu( menuItem ) ? menuItem.getParent() : menuItem).getForeground();
+		boolean isTopLevelMenu = isTopLevelMenu( menuItem );
+		Color foreground = (isTopLevelMenu ? menuItem.getParent() : menuItem).getForeground();
 
-		paintText( g, menuItem, textRect, text, mnemonicIndex, menuItem.getFont(),
+		paintText( g, menuItem, textRect, text, mnemonicIndex, isTopLevelMenu ? getTopLevelFont() : menuItem.getFont(),
 			foreground, isUnderlineSelection() ? foreground : selectionForeground, disabledForeground );
 	}
 
@@ -343,11 +431,10 @@ debug*/
 			return;
 
 		// center because the real icon may be smaller than dimension in iconRect
-		int x = iconRect.x + centerOffset( iconRect.width, icon.getIconWidth() );
 		int y = iconRect.y + centerOffset( iconRect.height, icon.getIconHeight() );
 
 		// paint
-		icon.paintIcon( menuItem, g, x, y );
+		icon.paintIcon( menuItem, g, iconRect.x, y );
 	}
 
 	protected static void paintText( Graphics g, JMenuItem menuItem,
@@ -376,12 +463,29 @@ debug*/
 	protected static void paintHTMLText( Graphics g, JMenuItem menuItem,
 		Rectangle textRect, View htmlView, Color selectionForeground )
 	{
+		// On Windows, using Segoe UI font, Java 15 or older and scaling greater than 1,
+		// the width of the HTML view may be initially too small (because component
+		// is not connected to a GraphicsConfiguration when getPreferredSize() is invoked).
+		// Since Java 16, this seems to be fixed somehow by doing popup menu layout twice.
+		//
+		// If using a too small width for htmlView.paint(), the view would rearrange
+		// its children and wrap them to two lines. To avoid this, use view preferred X span
+		// for painting. Core Lafs actually do the same in class MenuItemLayoutHelper.
+		//
+		// Example HTML text that causes the problem: "<html>some <b>HTML</b> <i>text</i></html>"
+		textRect = new Rectangle( textRect );
+		textRect.width = (int) htmlView.getPreferredSpan( View.X_AXIS );
+
 		if( isArmedOrSelected( menuItem ) && selectionForeground != null )
 			g = new GraphicsProxyWithTextColor( (Graphics2D) g, selectionForeground );
 
 		htmlView.paint( HiDPIUtils.createGraphicsTextYCorrection( (Graphics2D) g ), textRect );
 	}
 
+	/**
+	 * Returns {@code true} if either the menu item is armed (mouse over item)
+	 * or it is a {@code JMenu} and selected (shows submenu).
+	 */
 	protected static boolean isArmedOrSelected( JMenuItem menuItem ) {
 		return menuItem.isArmed() || (menuItem instanceof JMenu && menuItem.isSelected());
 	}
@@ -394,6 +498,15 @@ debug*/
 		return "underline".equals( UIManager.getString( "MenuItem.selectionType" ) );
 	}
 
+	private Font getTopLevelFont() {
+		Font font = menuItem.getFont();
+		// menu item parent may be null if JMenu.isTopLevelMenu() is overridden
+		// and does not check parent (e.g. com.jidesoft.swing.JideMenu.isTopLevelMenu())
+		return (font != menuFont || menuItem.getParent() == null)
+			? font
+			: menuItem.getParent().getFont();
+	}
+
 	private Icon getIconForPainting() {
 		Icon icon = menuItem.getIcon();
 
@@ -412,6 +525,12 @@ debug*/
 				return pressedIcon;
 		}
 
+		if( isArmedOrSelected( menuItem ) ) {
+			Icon selectedIcon = menuItem.getSelectedIcon();
+			if( selectedIcon != null )
+				return selectedIcon;
+		}
+
 		return icon;
 	}
 
@@ -498,6 +617,44 @@ debug*/
 		shiftGlyph = 0x21E7,
 		commandGlyph = 0x2318;
 
+	/**
+	 * Calculates the maximum width of all menu item icons in the popup.
+	 */
+	private int getMaxIconsWidth() {
+		if( !verticallyAlignText )
+			return 0;
+
+		Container parent = menuItem.getParent();
+		if( !(parent instanceof JComponent) )
+			return 0;
+
+		int maxWidth = FlatClientProperties.clientPropertyInt( (JComponent) parent, KEY_MAX_ICONS_WIDTH, -1 );
+		if( maxWidth >= 0 )
+			return maxWidth;
+
+		maxWidth = 0;
+
+		for( Component c : parent.getComponents() ) {
+			if( !(c instanceof JMenuItem) )
+				continue;
+
+			Icon icon = ((JMenuItem)c).getIcon();
+			if( icon != null )
+				maxWidth = Math.max( maxWidth, icon.getIconWidth() );
+		}
+
+		((JComponent)parent).putClientProperty( KEY_MAX_ICONS_WIDTH, maxWidth );
+		return maxWidth;
+	}
+
+	static void clearClientProperties( Component c ) {
+		if( !(c instanceof JComponent) )
+			return;
+
+		JComponent jc = (JComponent) c;
+		jc.putClientProperty( FlatMenuItemRenderer.KEY_MAX_ICONS_WIDTH, null );
+	}
+
 	//---- class MinSizeIcon --------------------------------------------------
 
 	private class MinSizeIcon
@@ -512,6 +669,7 @@ debug*/
 		@Override
 		public int getIconWidth() {
 			int iconWidth = (delegate != null) ? delegate.getIconWidth() : 0;
+			iconWidth = Math.max( iconWidth, getMaxIconsWidth() );
 			return Math.max( iconWidth, scale( minimumIconSize.width ) );
 		}
 

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatMenuItemUI.java

@@ -18,11 +18,20 @@ package com.formdev.flatlaf.ui;
 
 import java.awt.Dimension;
 import java.awt.Graphics;
+import java.beans.PropertyChangeListener;
+import java.lang.invoke.MethodHandles;
+import java.util.Map;
 import javax.swing.Icon;
 import javax.swing.JComponent;
+import javax.swing.JMenuItem;
 import javax.swing.LookAndFeel;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicMenuItemUI;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableField;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableLookupProvider;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableUI;
+import com.formdev.flatlaf.ui.FlatStylingSupport.UnknownStyleException;
+import com.formdev.flatlaf.util.LoggingFacade;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JMenuItem}.
@@ -52,15 +61,30 @@ import javax.swing.plaf.basic.BasicMenuItemUI;
  *
  * @author Karl Tauber
  */
+@StyleableField( cls=BasicMenuItemUI.class, key="selectionBackground" )
+@StyleableField( cls=BasicMenuItemUI.class, key="selectionForeground" )
+@StyleableField( cls=BasicMenuItemUI.class, key="disabledForeground" )
+@StyleableField( cls=BasicMenuItemUI.class, key="acceleratorForeground" )
+@StyleableField( cls=BasicMenuItemUI.class, key="acceleratorSelectionForeground" )
+
 public class FlatMenuItemUI
 	extends BasicMenuItemUI
+	implements StyleableUI, StyleableLookupProvider
 {
 	private FlatMenuItemRenderer renderer;
+	private Map<String, Object> oldStyleValues;
 
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatMenuItemUI();
 	}
 
+	@Override
+	public void installUI( JComponent c ) {
+		super.installUI( c );
+
+		installStyle();
+	}
+
 	@Override
 	protected void installDefaults() {
 		super.installDefaults();
@@ -74,13 +98,84 @@ public class FlatMenuItemUI
 	protected void uninstallDefaults() {
 		super.uninstallDefaults();
 
+		FlatMenuItemRenderer.clearClientProperties( menuItem.getParent() );
 		renderer = null;
+		oldStyleValues = null;
 	}
 
 	protected FlatMenuItemRenderer createRenderer() {
 		return new FlatMenuItemRenderer( menuItem, checkIcon, arrowIcon, acceleratorFont, acceleratorDelimiter );
 	}
 
+	@Override
+	protected PropertyChangeListener createPropertyChangeListener( JComponent c ) {
+		return FlatStylingSupport.createPropertyChangeListener( c, this::installStyle, super.createPropertyChangeListener( c ) );
+	}
+
+	/** @since 2 */
+	protected void installStyle() {
+		try {
+			applyStyle( FlatStylingSupport.getResolvedStyle( menuItem, "MenuItem" ) );
+		} catch( RuntimeException ex ) {
+			LoggingFacade.INSTANCE.logSevere( null, ex );
+		}
+	}
+
+	/** @since 2 */
+	protected void applyStyle( Object style ) {
+		oldStyleValues = FlatStylingSupport.parseAndApply( oldStyleValues, style, this::applyStyleProperty );
+	}
+
+	/** @since 2 */
+	protected Object applyStyleProperty( String key, Object value ) {
+		return applyStyleProperty( menuItem, this, renderer, key, value );
+	}
+
+	static Object applyStyleProperty( JMenuItem menuItem, BasicMenuItemUI ui,
+		FlatMenuItemRenderer renderer, String key, Object value )
+	{
+		try {
+			return renderer.applyStyleProperty( key, value );
+		} catch ( UnknownStyleException ex ) {
+			// ignore
+		}
+
+		return FlatStylingSupport.applyToAnnotatedObjectOrComponent( ui, menuItem, key, value );
+	}
+
+	/** @since 2 */
+	@Override
+	public Map<String, Class<?>> getStyleableInfos( JComponent c ) {
+		return getStyleableInfos( this, renderer );
+	}
+
+	static Map<String, Class<?>> getStyleableInfos( BasicMenuItemUI ui, FlatMenuItemRenderer renderer ) {
+		Map<String, Class<?>> infos = FlatStylingSupport.getAnnotatedStyleableInfos( ui );
+		infos.putAll( renderer.getStyleableInfos() );
+		return infos;
+	}
+
+	/** @since 2.5 */
+	@Override
+	public Object getStyleableValue( JComponent c, String key ) {
+		return getStyleableValue( this, renderer, key );
+	}
+
+	static Object getStyleableValue( BasicMenuItemUI ui, FlatMenuItemRenderer renderer, String key ) {
+		Object value = renderer.getStyleableValue( key );
+		if( value == null )
+			value = FlatStylingSupport.getAnnotatedStyleableValue( ui, key );
+		return value;
+	}
+
+	/** @since 2.5 */
+	@Override
+	public MethodHandles.Lookup getLookupForStyling() {
+		// MethodHandles.lookup() is caller sensitive and must be invoked in this class,
+		// otherwise it is not possible to access protected fields in JRE superclass
+		return MethodHandles.lookup();
+	}
+
 	@Override
 	protected Dimension getPreferredMenuItemSize( JComponent c, Icon checkIcon, Icon arrowIcon, int defaultTextIconGap ) {
 		return renderer.getPreferredMenuItemSize();

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatMenuUI.java

@@ -20,17 +20,29 @@ import java.awt.Color;
 import java.awt.Dimension;
 import java.awt.Font;
 import java.awt.Graphics;
+import java.awt.Rectangle;
 import java.awt.event.MouseEvent;
+import java.beans.PropertyChangeListener;
+import java.lang.invoke.MethodHandles;
+import java.util.Map;
+import java.util.function.Function;
 import javax.swing.ButtonModel;
 import javax.swing.Icon;
 import javax.swing.JComponent;
 import javax.swing.JMenu;
+import javax.swing.JMenuBar;
 import javax.swing.JMenuItem;
 import javax.swing.LookAndFeel;
 import javax.swing.UIManager;
 import javax.swing.event.MouseInputListener;
 import javax.swing.plaf.ComponentUI;
+import javax.swing.plaf.MenuBarUI;
+import javax.swing.plaf.basic.BasicMenuItemUI;
 import javax.swing.plaf.basic.BasicMenuUI;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableField;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableLookupProvider;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableUI;
+import com.formdev.flatlaf.util.LoggingFacade;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JMenu}.
@@ -60,26 +72,42 @@ import javax.swing.plaf.basic.BasicMenuUI;
  * <!-- FlatMenuUI -->
  *
  * @uiDefault MenuItem.iconTextGap									int
- * @uiDefault MenuBar.hoverBackground								Color
  *
  * <!-- FlatMenuRenderer -->
  *
+ * @uiDefault MenuBar.hoverBackground								Color
+ * @uiDefault MenuBar.selectionBackground							Color
+ * @uiDefault MenuBar.selectionForeground							Color
  * @uiDefault MenuBar.underlineSelectionBackground					Color
  * @uiDefault MenuBar.underlineSelectionColor						Color
  * @uiDefault MenuBar.underlineSelectionHeight						int
  *
  * @author Karl Tauber
  */
+@StyleableField( cls=BasicMenuItemUI.class, key="selectionBackground" )
+@StyleableField( cls=BasicMenuItemUI.class, key="selectionForeground" )
+@StyleableField( cls=BasicMenuItemUI.class, key="disabledForeground" )
+@StyleableField( cls=BasicMenuItemUI.class, key="acceleratorForeground" )
+@StyleableField( cls=BasicMenuItemUI.class, key="acceleratorSelectionForeground" )
+
 public class FlatMenuUI
 	extends BasicMenuUI
+	implements StyleableUI, StyleableLookupProvider
 {
-	private Color hoverBackground;
 	private FlatMenuItemRenderer renderer;
+	private Map<String, Object> oldStyleValues;
 
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatMenuUI();
 	}
 
+	@Override
+	public void installUI( JComponent c ) {
+		super.installUI( c );
+
+		installStyle();
+	}
+
 	@Override
 	protected void installDefaults() {
 		super.installDefaults();
@@ -88,7 +116,6 @@ public class FlatMenuUI
 
 		menuItem.setRolloverEnabled( true );
 
-		hoverBackground = UIManager.getColor( "MenuBar.hoverBackground" );
 		renderer = createRenderer();
 	}
 
@@ -96,8 +123,9 @@ public class FlatMenuUI
 	protected void uninstallDefaults() {
 		super.uninstallDefaults();
 
-		hoverBackground = null;
+		FlatMenuItemRenderer.clearClientProperties( menuItem.getParent() );
 		renderer = null;
+		oldStyleValues = null;
 	}
 
 	protected FlatMenuItemRenderer createRenderer() {
@@ -129,6 +157,50 @@ public class FlatMenuUI
 		};
 	}
 
+	@Override
+	protected PropertyChangeListener createPropertyChangeListener( JComponent c ) {
+		return FlatStylingSupport.createPropertyChangeListener( c, this::installStyle, super.createPropertyChangeListener( c ) );
+	}
+
+	/** @since 2 */
+	protected void installStyle() {
+		try {
+			applyStyle( FlatStylingSupport.getResolvedStyle( menuItem, "Menu" ) );
+		} catch( RuntimeException ex ) {
+			LoggingFacade.INSTANCE.logSevere( null, ex );
+		}
+	}
+
+	/** @since 2 */
+	protected void applyStyle( Object style ) {
+		oldStyleValues = FlatStylingSupport.parseAndApply( oldStyleValues, style, this::applyStyleProperty );
+	}
+
+	/** @since 2 */
+	protected Object applyStyleProperty( String key, Object value ) {
+		return FlatMenuItemUI.applyStyleProperty( menuItem, this, renderer, key, value );
+	}
+
+	/** @since 2 */
+	@Override
+	public Map<String, Class<?>> getStyleableInfos( JComponent c ) {
+		return FlatMenuItemUI.getStyleableInfos( this, renderer );
+	}
+
+	/** @since 2.5 */
+	@Override
+	public Object getStyleableValue( JComponent c, String key ) {
+		return FlatMenuItemUI.getStyleableValue( this, renderer, key );
+	}
+
+	/** @since 2.5 */
+	@Override
+	public MethodHandles.Lookup getLookupForStyling() {
+		// MethodHandles.lookup() is caller sensitive and must be invoked in this class,
+		// otherwise it is not possible to access protected fields in JRE superclass
+		return MethodHandles.lookup();
+	}
+
 	@Override
 	public Dimension getMinimumSize( JComponent c ) {
 		// avoid that top-level menus (in menu bar) are made smaller if horizontal space is rare
@@ -153,9 +225,12 @@ public class FlatMenuUI
 	protected class FlatMenuRenderer
 		extends FlatMenuItemRenderer
 	{
-		protected final Color menuBarUnderlineSelectionBackground = FlatUIUtils.getUIColor( "MenuBar.underlineSelectionBackground", underlineSelectionBackground );
-		protected final Color menuBarUnderlineSelectionColor = FlatUIUtils.getUIColor( "MenuBar.underlineSelectionColor", underlineSelectionColor );
-		protected final int menuBarUnderlineSelectionHeight = FlatUIUtils.getUIInt( "MenuBar.underlineSelectionHeight", underlineSelectionHeight );
+		protected Color hoverBackground = UIManager.getColor( "MenuBar.hoverBackground" );
+		protected Color menuBarSelectionBackground = UIManager.getColor( "MenuBar.selectionBackground" );
+		protected Color menuBarSelectionForeground = UIManager.getColor( "MenuBar.selectionForeground" );
+		protected Color menuBarUnderlineSelectionBackground = FlatUIUtils.getUIColor( "MenuBar.underlineSelectionBackground", underlineSelectionBackground );
+		protected Color menuBarUnderlineSelectionColor = FlatUIUtils.getUIColor( "MenuBar.underlineSelectionColor", underlineSelectionColor );
+		protected int menuBarUnderlineSelectionHeight = FlatUIUtils.getUIInt( "MenuBar.underlineSelectionHeight", underlineSelectionHeight );
 
 		protected FlatMenuRenderer( JMenuItem menuItem, Icon checkIcon, Icon arrowIcon,
 			Font acceleratorFont, String acceleratorDelimiter )
@@ -165,27 +240,53 @@ public class FlatMenuUI
 
 		@Override
 		protected void paintBackground( Graphics g, Color selectionBackground ) {
-			if( isUnderlineSelection() && ((JMenu)menuItem).isTopLevelMenu() )
-				selectionBackground = menuBarUnderlineSelectionBackground;
+			if( ((JMenu)menuItem).isTopLevelMenu() ) {
+				if( isUnderlineSelection() )
+					selectionBackground = getStyleFromMenuBarUI( ui -> ui.underlineSelectionBackground, menuBarUnderlineSelectionBackground );
+				else {
+					selectionBackground = getStyleFromMenuBarUI( ui -> ui.selectionBackground,
+						menuBarSelectionBackground != null ? menuBarSelectionBackground : selectionBackground );
+				}
 
-			ButtonModel model = menuItem.getModel();
-			if( model.isRollover() && !model.isArmed() && !model.isSelected() &&
-				model.isEnabled() && ((JMenu)menuItem).isTopLevelMenu() )
-			{
-				g.setColor( deriveBackground( hoverBackground ) );
-				g.fillRect( 0, 0, menuItem.getWidth(), menuItem.getHeight() );
-			} else
-				super.paintBackground( g, selectionBackground );
+				ButtonModel model = menuItem.getModel();
+				if( model.isRollover() && !model.isArmed() && !model.isSelected() && model.isEnabled() ) {
+					g.setColor( deriveBackground( getStyleFromMenuBarUI( ui -> ui.hoverBackground, hoverBackground ) ) );
+					g.fillRect( 0, 0, menuItem.getWidth(), menuItem.getHeight() );
+					return;
+				}
+			}
+
+			super.paintBackground( g, selectionBackground );
+		}
+
+		@Override
+		protected void paintText( Graphics g, Rectangle textRect, String text, Color selectionForeground, Color disabledForeground ) {
+			if( ((JMenu)menuItem).isTopLevelMenu() && !isUnderlineSelection() ) {
+				selectionForeground = getStyleFromMenuBarUI( ui -> ui.selectionForeground,
+					menuBarSelectionForeground != null ? menuBarSelectionForeground : selectionForeground );
+			}
+
+			super.paintText( g, textRect, text, selectionForeground, disabledForeground );
 		}
 
 		@Override
 		protected void paintUnderlineSelection( Graphics g, Color underlineSelectionColor, int underlineSelectionHeight ) {
 			if( ((JMenu)menuItem).isTopLevelMenu() ) {
-				underlineSelectionColor = menuBarUnderlineSelectionColor;
-				underlineSelectionHeight = menuBarUnderlineSelectionHeight;
+				underlineSelectionColor = getStyleFromMenuBarUI( ui -> ui.underlineSelectionColor, menuBarUnderlineSelectionColor );
+				underlineSelectionHeight = getStyleFromMenuBarUI( ui -> (ui.underlineSelectionHeight != -1)
+					? ui.underlineSelectionHeight : null, menuBarUnderlineSelectionHeight );
 			}
 
 			super.paintUnderlineSelection( g, underlineSelectionColor, underlineSelectionHeight );
 		}
+
+		private <T> T getStyleFromMenuBarUI( Function<FlatMenuBarUI, T> f, T defaultValue ) {
+			MenuBarUI ui = ((JMenuBar)menuItem.getParent()).getUI();
+			if( !(ui instanceof FlatMenuBarUI) )
+				return defaultValue;
+
+			T value = f.apply( (FlatMenuBarUI) ui );
+			return (value != null) ? value : defaultValue;
+		}
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatNativeLibrary.java

@@ -0,0 +1,115 @@
+/*
+ * Copyright 2022 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.ui;
+
+import java.io.File;
+import com.formdev.flatlaf.FlatSystemProperties;
+import com.formdev.flatlaf.util.LoggingFacade;
+import com.formdev.flatlaf.util.NativeLibrary;
+import com.formdev.flatlaf.util.SystemInfo;
+
+/**
+ * Helper class to load FlatLaf native library (.dll, .so or .dylib),
+ * if available for current operating system and CPU architecture.
+ *
+ * @author Karl Tauber
+ * @since 2.3
+ */
+class FlatNativeLibrary
+{
+	private static NativeLibrary nativeLibrary;
+
+	/**
+	 * Loads native library (if available) and returns whether loaded successfully.
+	 * Returns {@code false} if no native library is available.
+	 */
+	static synchronized boolean isLoaded() {
+		initialize();
+		return (nativeLibrary != null) ? nativeLibrary.isLoaded() : false;
+	}
+
+	private static void initialize() {
+		if( nativeLibrary != null )
+			return;
+
+		String libraryName;
+		if( SystemInfo.isWindows_10_orLater && (SystemInfo.isX86 || SystemInfo.isX86_64) ) {
+			// Windows: requires Windows 10/11 (x86 or x86_64)
+
+			libraryName = "flatlaf-windows-x86";
+			if( SystemInfo.isX86_64 )
+				libraryName += "_64";
+
+			// In Java 8, load jawt.dll (part of JRE) explicitly because it
+			// is not found when running application with <jdk>/bin/java.exe.
+			// When using <jdk>/jre/bin/java.exe, it is found.
+			// jawt.dll is located in <jdk>/jre/bin/.
+			// Java 9 and later do not have this problem,
+			// but load jawt.dll anyway to be on the safe side.
+			loadJAWT();
+		} else if( SystemInfo.isLinux && SystemInfo.isX86_64 ) {
+			// Linux: requires x86_64
+
+			libraryName = "flatlaf-linux-x86_64";
+
+			// Load libjawt.so (part of JRE) explicitly because it is not found
+			// in all Java versions/distributions.
+			// E.g. not found in Java 13 and later from openjdk.java.net.
+			// There seems to be also differences between distributions.
+			// E.g. Adoptium Java 17 does not need this, but Java 17 from openjdk.java.net does.
+			loadJAWT();
+		} else
+			return; // no native library available for current OS or CPU architecture
+
+		// load native library
+		nativeLibrary = createNativeLibrary( libraryName );
+	}
+
+	private static NativeLibrary createNativeLibrary( String libraryName ) {
+		String libraryPath = System.getProperty( FlatSystemProperties.NATIVE_LIBRARY_PATH );
+		if( libraryPath != null ) {
+			if( "system".equals( libraryPath ) ) {
+				NativeLibrary library = new NativeLibrary( libraryName, true );
+				if( library.isLoaded() )
+					return library;
+
+				LoggingFacade.INSTANCE.logSevere( "Did not find library " + libraryName + " in java.library.path, using extracted library instead", null );
+			} else {
+				File libraryFile = new File( libraryPath, System.mapLibraryName( libraryName ) );
+				if( libraryFile.exists() )
+					return new NativeLibrary( libraryFile, true );
+
+				LoggingFacade.INSTANCE.logSevere( "Did not find external library " + libraryFile + ", using extracted library instead", null );
+			}
+		}
+
+		return new NativeLibrary( "com/formdev/flatlaf/natives/" + libraryName, null, true );
+	}
+
+	private static void loadJAWT() {
+		try {
+			System.loadLibrary( "jawt" );
+		} catch( UnsatisfiedLinkError ex ) {
+			// log error only if native library jawt.dll not already loaded
+			String message = ex.getMessage();
+			if( message == null || !message.contains( "already loaded in another classloader" ) )
+				LoggingFacade.INSTANCE.logSevere( message, ex );
+		} catch( Exception ex ) {
+			LoggingFacade.INSTANCE.logSevere( ex.getMessage(), ex );
+		}
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatNativeLinuxLibrary.java

@@ -0,0 +1,104 @@
+/*
+ * Copyright 2022 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.ui;
+
+import java.awt.Point;
+import java.awt.Toolkit;
+import java.awt.Window;
+import java.awt.event.MouseEvent;
+import java.awt.geom.AffineTransform;
+import javax.swing.JDialog;
+import javax.swing.JFrame;
+
+/**
+ * Native methods for Linux.
+ * <p>
+ * <b>Note</b>: This is private API. Do not use!
+ *
+ * @author Karl Tauber
+ * @since 2.5
+ */
+class FlatNativeLinuxLibrary
+{
+	static boolean isLoaded() {
+		return FlatNativeLibrary.isLoaded();
+	}
+
+	// direction for _NET_WM_MOVERESIZE message
+	// see https://specifications.freedesktop.org/wm-spec/wm-spec-latest.html
+	static final int MOVE = 8;
+
+	private static Boolean isXWindowSystem;
+
+	private static boolean isXWindowSystem() {
+		if( isXWindowSystem == null )
+			isXWindowSystem = Toolkit.getDefaultToolkit().getClass().getName().endsWith( ".XToolkit" );
+		return isXWindowSystem;
+	}
+
+	static boolean isWMUtilsSupported( Window window ) {
+		return hasCustomDecoration( window ) && isXWindowSystem() && isLoaded();
+	}
+
+	static boolean moveOrResizeWindow( Window window, MouseEvent e, int direction ) {
+		Point pt = scale( window, e.getLocationOnScreen() );
+		return xMoveOrResizeWindow( window, pt.x, pt.y, direction );
+
+/*
+		try {
+			Class<?> cls = Class.forName( "com.formdev.flatlaf.natives.jna.linux.X11WmUtils" );
+			java.lang.reflect.Method m = cls.getMethod( "xMoveOrResizeWindow", Window.class, int.class, int.class, int.class );
+			return (Boolean) m.invoke( null, window, pt.x, pt.y, direction );
+		} catch (Exception ex) {
+			ex.printStackTrace();
+			return false;
+		}
+*/
+	}
+
+	static boolean showWindowMenu( Window window, MouseEvent e ) {
+		Point pt = scale( window, e.getLocationOnScreen() );
+		return xShowWindowMenu( window, pt.x, pt.y );
+
+/*
+		try {
+			Class<?> cls = Class.forName( "com.formdev.flatlaf.natives.jna.linux.X11WmUtils" );
+			java.lang.reflect.Method m = cls.getMethod( "xShowWindowMenu", Window.class, int.class, int.class );
+			return (Boolean) m.invoke( null, window, pt.x, pt.y );
+		} catch (Exception ex) {
+			ex.printStackTrace();
+			return false;
+		}
+*/
+	}
+
+	private static Point scale( Window window, Point pt ) {
+		AffineTransform transform = window.getGraphicsConfiguration().getDefaultTransform();
+		int x = (int) Math.round( pt.x * transform.getScaleX() );
+		int y = (int) Math.round( pt.y * transform.getScaleY() );
+		return new Point( x, y );
+	}
+
+	// X Window System
+	private static native boolean xMoveOrResizeWindow( Window window, int x, int y, int direction );
+	private static native boolean xShowWindowMenu( Window window, int x, int y );
+
+	private static boolean hasCustomDecoration( Window window ) {
+		return (window instanceof JFrame && JFrame.isDefaultLookAndFeelDecorated() && ((JFrame)window).isUndecorated()) ||
+			(window instanceof JDialog && JDialog.isDefaultLookAndFeelDecorated() && ((JDialog)window).isUndecorated());
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatNativeWindowBorder.java

@@ -17,6 +17,7 @@
 package com.formdev.flatlaf.ui;
 
 import java.awt.Color;
+import java.awt.Container;
 import java.awt.Rectangle;
 import java.awt.Window;
 import java.beans.PropertyChangeListener;
@@ -24,9 +25,9 @@ import java.util.List;
 import javax.swing.JDialog;
 import javax.swing.JFrame;
 import javax.swing.JRootPane;
-import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
 import javax.swing.event.ChangeListener;
+import com.formdev.flatlaf.FlatClientProperties;
 import com.formdev.flatlaf.FlatLaf;
 import com.formdev.flatlaf.FlatSystemProperties;
 import com.formdev.flatlaf.ui.JBRCustomDecorations.JBRWindowTopBorder;
@@ -40,9 +41,24 @@ import com.formdev.flatlaf.util.SystemInfo;
  */
 public class FlatNativeWindowBorder
 {
+	// can use window decorations if:
+	// - on Windows 10 or later
+	// - not if system property "sun.java2d.opengl" is true on Windows 10
+	// - not when running in JetBrains Projector, Webswing or WinPE
+	// - not disabled via system property
+	private static final boolean canUseWindowDecorations =
+		SystemInfo.isWindows_10_orLater &&
+		(SystemInfo.isWindows_11_orLater || !FlatSystemProperties.getBoolean( "sun.java2d.opengl", false )) &&
+		!SystemInfo.isProjector &&
+		!SystemInfo.isWebswing &&
+		!SystemInfo.isWinPE &&
+		FlatSystemProperties.getBoolean( FlatSystemProperties.USE_WINDOW_DECORATIONS, true );
+
 	// check this field before using class JBRCustomDecorations to avoid unnecessary loading of that class
-	private static final boolean canUseJBRCustomDecorations
-		= SystemInfo.isJetBrainsJVM_11_orLater && SystemInfo.isWindows_10_orLater;
+	private static final boolean canUseJBRCustomDecorations =
+		canUseWindowDecorations &&
+		SystemInfo.isJetBrainsJVM_11_orLater &&
+		FlatSystemProperties.getBoolean( FlatSystemProperties.USE_JETBRAINS_CUSTOM_DECORATIONS, false );
 
 	private static Boolean supported;
 	private static Provider nativeProvider;
@@ -62,25 +78,29 @@ public class FlatNativeWindowBorder
 		if( !isSupported() )
 			return null;
 
-		// Check whether root pane already has a window, which is the case when switching LaF.
+		// do nothing if root pane has a parent that is not a window (e.g. a JInternalFrame)
+		Container parent = rootPane.getParent();
+		if( parent != null && !(parent instanceof Window) )
+			return null;
+
+		// Check whether root pane already has a window, which is the case when
+		// switching from another LaF to FlatLaf.
 		// Also check whether the window is displayable, which is required to install
 		// FlatLaf native window border.
 		// If the window is not displayable, then it was probably closed/disposed but not yet removed
 		// from the list of windows that AWT maintains and returns with Window.getWindows().
 		// It could be also be a window that is currently hidden, but may be shown later.
-		Window window = SwingUtilities.windowForComponent( rootPane );
-		if( window != null && window.isDisplayable() ) {
-			install( window, FlatSystemProperties.USE_WINDOW_DECORATIONS );
-			return null;
-		}
+		if( parent instanceof Window && parent.isDisplayable() )
+			install( (Window) parent );
 
 		// Install FlatLaf native window border, which must be done late,
 		// when the native window is already created, because it needs access to the window.
+		// Uninstall FlatLaf native window border when window is disposed (or root pane removed).
 		// "ancestor" property change event is fired from JComponent.addNotify() and removeNotify().
 		PropertyChangeListener ancestorListener = e -> {
 			Object newValue = e.getNewValue();
 			if( newValue instanceof Window )
-				install( (Window) newValue, FlatSystemProperties.USE_WINDOW_DECORATIONS );
+				install( (Window) newValue );
 			else if( newValue == null && e.getOldValue() instanceof Window )
 				uninstall( (Window) e.getOldValue() );
 		};
@@ -88,7 +108,7 @@ public class FlatNativeWindowBorder
 		return ancestorListener;
 	}
 
-	static void install( Window window, String systemPropertyKey ) {
+	static void install( Window window ) {
 		if( hasCustomDecoration( window ) )
 			return;
 
@@ -98,13 +118,11 @@ public class FlatNativeWindowBorder
 
 		if( window instanceof JFrame ) {
 			JFrame frame = (JFrame) window;
+			JRootPane rootPane = frame.getRootPane();
 
-			// do not enable native window border if JFrame should use system window decorations
-			// and if not forced to use FlatLaf/JBR native window decorations
-			if( !JFrame.isDefaultLookAndFeelDecorated() &&
-				!UIManager.getBoolean( "TitlePane.useWindowDecorations" ) &&
-				!FlatSystemProperties.getBoolean( systemPropertyKey, false ) )
-			  return;
+			// check whether disabled via system property, client property or UI default
+			if( !useWindowDecorations( rootPane ) )
+				return;
 
 			// do not enable native window border if frame is undecorated
 			if( frame.isUndecorated() )
@@ -113,18 +131,20 @@ public class FlatNativeWindowBorder
 			// enable native window border for window
 			setHasCustomDecoration( frame, true );
 
+			// avoid double window title bar if enabling native window border failed
+			if( !hasCustomDecoration( frame ) )
+				return;
+
 			// enable Swing window decoration
-			frame.getRootPane().setWindowDecorationStyle( JRootPane.FRAME );
+			rootPane.setWindowDecorationStyle( JRootPane.FRAME );
 
 		} else if( window instanceof JDialog ) {
 			JDialog dialog = (JDialog) window;
+			JRootPane rootPane = dialog.getRootPane();
 
-			// do not enable native window border if JDialog should use system window decorations
-			// and if not forced to use FlatLaf/JBR native window decorations
-			if( !JDialog.isDefaultLookAndFeelDecorated() &&
-				!UIManager.getBoolean( "TitlePane.useWindowDecorations" ) &&
-				!FlatSystemProperties.getBoolean( systemPropertyKey, false ) )
-			  return;
+			// check whether disabled via system property, client property or UI default
+			if( !useWindowDecorations( rootPane ) )
+				return;
 
 			// do not enable native window border if dialog is undecorated
 			if( dialog.isUndecorated() )
@@ -133,8 +153,12 @@ public class FlatNativeWindowBorder
 			// enable native window border for window
 			setHasCustomDecoration( dialog, true );
 
+			// avoid double window title bar if enabling native window border failed
+			if( !hasCustomDecoration( dialog ) )
+				return;
+
 			// enable Swing window decoration
-			dialog.getRootPane().setWindowDecorationStyle( JRootPane.PLAIN_DIALOG );
+			rootPane.setWindowDecorationStyle( JRootPane.PLAIN_DIALOG );
 		}
 	}
 
@@ -144,24 +168,27 @@ public class FlatNativeWindowBorder
 			return;
 		}
 
+		if( !isSupported() )
+			return;
+
 		// remove listener
 		if( data instanceof PropertyChangeListener )
 			rootPane.removePropertyChangeListener( "ancestor", (PropertyChangeListener) data );
 
-		// uninstall native window border, except when switching to another FlatLaf theme
-		Window window = SwingUtilities.windowForComponent( rootPane );
-		if( window != null )
-			uninstall( window );
+		// do not uninstall when switching to another FlatLaf theme and if still enabled
+		if( UIManager.getLookAndFeel() instanceof FlatLaf && useWindowDecorations( rootPane ) )
+			return;
+
+		// uninstall native window border
+		Container parent = rootPane.getParent();
+		if( parent instanceof Window )
+			uninstall( (Window) parent );
 	}
 
 	private static void uninstall( Window window ) {
 		if( !hasCustomDecoration( window ) )
 			return;
 
-		// do not uninstall when switching to another FlatLaf theme
-		if( UIManager.getLookAndFeel() instanceof FlatLaf )
-			return;
-
 		// disable native window border for window
 		setHasCustomDecoration( window, false );
 
@@ -179,6 +206,14 @@ public class FlatNativeWindowBorder
 		}
 	}
 
+	private static boolean useWindowDecorations( JRootPane rootPane ) {
+		return FlatUIUtils.getBoolean( rootPane,
+			FlatSystemProperties.USE_WINDOW_DECORATIONS,
+			FlatClientProperties.USE_WINDOW_DECORATIONS,
+			"TitlePane.useWindowDecorations",
+			false );
+	}
+
 	public static boolean hasCustomDecoration( Window window ) {
 		if( canUseJBRCustomDecorations )
 			return JBRCustomDecorations.hasCustomDecoration( window );
@@ -202,7 +237,8 @@ public class FlatNativeWindowBorder
 	}
 
 	static void setTitleBarHeightAndHitTestSpots( Window window, int titleBarHeight,
-		List<Rectangle> hitTestSpots, Rectangle appIconBounds )
+		List<Rectangle> hitTestSpots, Rectangle appIconBounds, Rectangle minimizeButtonBounds,
+		Rectangle maximizeButtonBounds, Rectangle closeButtonBounds )
 	{
 		if( canUseJBRCustomDecorations ) {
 			JBRCustomDecorations.setTitleBarHeightAndHitTestSpots( window, titleBarHeight, hitTestSpots );
@@ -212,9 +248,15 @@ public class FlatNativeWindowBorder
 		if( !isSupported() )
 			return;
 
-		nativeProvider.setTitleBarHeight( window, titleBarHeight );
-		nativeProvider.setTitleBarHitTestSpots( window, hitTestSpots );
-		nativeProvider.setTitleBarAppIconBounds( window, appIconBounds );
+		nativeProvider.updateTitleBarInfo( window, titleBarHeight, hitTestSpots,
+			appIconBounds, minimizeButtonBounds, maximizeButtonBounds, closeButtonBounds );
+	}
+
+	static boolean showWindow( Window window, int cmd ) {
+		if( canUseJBRCustomDecorations || !isSupported() )
+			return false;
+
+		return nativeProvider.showWindow( window, cmd );
 	}
 
 	private static void initialize() {
@@ -222,41 +264,46 @@ public class FlatNativeWindowBorder
 			return;
 		supported = false;
 
-		// requires Windows 10
-		if( !SystemInfo.isWindows_10_orLater )
-			return;
-
-		// do not use when running in JetBrains Projector
-		if( SystemInfo.isProjector )
-			return;
-
-		// check whether disabled via system property
-		if( !FlatSystemProperties.getBoolean( FlatSystemProperties.USE_WINDOW_DECORATIONS, true ) )
+		if( !canUseWindowDecorations )
 			return;
 
 		try {
 /*
 			Class<?> cls = Class.forName( "com.formdev.flatlaf.natives.jna.windows.FlatWindowsNativeWindowBorder" );
-			Method m = cls.getMethod( "getInstance" );
-			nativeProvider = (Provider) m.invoke( null );
+			java.lang.reflect.Method m = cls.getMethod( "getInstance" );
+			setNativeProvider( (Provider) m.invoke( null ) );
 */
-			nativeProvider = FlatWindowsNativeWindowBorder.getInstance();
-
-			supported = (nativeProvider != null);
+			setNativeProvider( FlatWindowsNativeWindowBorder.getInstance() );
 		} catch( Exception ex ) {
 			// ignore
 		}
 	}
 
+	/** @since 1.1.1 */
+	public static void setNativeProvider( Provider provider ) {
+		if( nativeProvider != null )
+			throw new IllegalStateException();
+
+		nativeProvider = provider;
+		supported = (nativeProvider != null);
+	}
+
 	//---- interface Provider -------------------------------------------------
 
 	public interface Provider
 	{
 		boolean hasCustomDecoration( Window window );
 		void setHasCustomDecoration( Window window, boolean hasCustomDecoration );
-		void setTitleBarHeight( Window window, int titleBarHeight );
-		void setTitleBarHitTestSpots( Window window, List<Rectangle> hitTestSpots );
-		void setTitleBarAppIconBounds( Window window, Rectangle appIconBounds );
+		void updateTitleBarInfo( Window window, int titleBarHeight, List<Rectangle> hitTestSpots,
+			Rectangle appIconBounds, Rectangle minimizeButtonBounds, Rectangle maximizeButtonBounds,
+			Rectangle closeButtonBounds );
+
+		// commands for showWindow(); values must match Win32 API
+		// https://docs.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-showwindow
+		int SW_MAXIMIZE = 3;
+		int SW_MINIMIZE = 6;
+		int SW_RESTORE = 9;
+		boolean showWindow( Window window, int cmd );
 
 		boolean isColorizationColorAffectsBorders();
 		Color getColorizationColor();
@@ -268,6 +315,10 @@ public class FlatNativeWindowBorder
 
 	//---- class WindowTopBorder -------------------------------------------
 
+	/**
+	 * Window top border used on Windows 10.
+	 * No longer needed since Windows 11.
+	 */
 	static class WindowTopBorder
 		extends JBRCustomDecorations.JBRWindowTopBorder
 	{

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatOptionPaneUI.java

@@ -19,17 +19,24 @@ package com.formdev.flatlaf.ui;
 import java.awt.Component;
 import java.awt.Container;
 import java.awt.Dimension;
-import java.awt.Graphics;
 import java.awt.GridBagConstraints;
-import java.awt.Insets;
+import java.beans.PropertyChangeListener;
+import javax.swing.Box;
+import javax.swing.BoxLayout;
+import javax.swing.Icon;
 import javax.swing.JComponent;
+import javax.swing.JLabel;
 import javax.swing.JPanel;
+import javax.swing.JRootPane;
+import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
 import javax.swing.border.Border;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicHTML;
 import javax.swing.plaf.basic.BasicOptionPaneUI;
+import com.formdev.flatlaf.FlatClientProperties;
+import com.formdev.flatlaf.util.SwingUtils;
 import com.formdev.flatlaf.util.UIScale;
 
 /**
@@ -75,6 +82,7 @@ import com.formdev.flatlaf.util.UIScale;
  *
  * <!-- FlatOptionPaneUI -->
  *
+ * @uiDefault OptionPane.showIcon					boolean
  * @uiDefault OptionPane.iconMessageGap				int
  * @uiDefault OptionPane.messagePadding				int
  * @uiDefault OptionPane.maxCharactersPerLine		int
@@ -84,10 +92,12 @@ import com.formdev.flatlaf.util.UIScale;
 public class FlatOptionPaneUI
 	extends BasicOptionPaneUI
 {
+	/** @since 2 */ protected boolean showIcon;
 	protected int iconMessageGap;
 	protected int messagePadding;
 	protected int maxCharactersPerLine;
 	private int focusWidth;
+	private boolean sameSizeButtons;
 
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatOptionPaneUI();
@@ -97,10 +107,12 @@ public class FlatOptionPaneUI
 	protected void installDefaults() {
 		super.installDefaults();
 
+		showIcon = UIManager.getBoolean( "OptionPane.showIcon" );
 		iconMessageGap = UIManager.getInt( "OptionPane.iconMessageGap" );
 		messagePadding = UIManager.getInt( "OptionPane.messagePadding" );
 		maxCharactersPerLine = UIManager.getInt( "OptionPane.maxCharactersPerLine" );
 		focusWidth = UIManager.getInt( "Component.focusWidth" );
+		sameSizeButtons = FlatUIUtils.getUIBoolean( "OptionPane.sameSizeButtons", true );
 	}
 
 	@Override
@@ -110,6 +122,24 @@ public class FlatOptionPaneUI
 		updateChildPanels( optionPane );
 	}
 
+	@Override
+	protected PropertyChangeListener createPropertyChangeListener() {
+		PropertyChangeListener superListener = super.createPropertyChangeListener();
+		return e -> {
+			superListener.propertyChange( e );
+
+			// hide window title bar icon
+			// (only if showIcon is false, otherwise the default behavior is used)
+			if( !showIcon && "ancestor".equals( e.getPropertyName() ) && e.getNewValue() != null ) {
+				JRootPane rootPane = SwingUtilities.getRootPane( optionPane );
+				if( rootPane != null &&
+					rootPane.getContentPane().getComponentCount() > 0 &&
+					rootPane.getContentPane().getComponent( 0 ) == optionPane )
+				  rootPane.putClientProperty( FlatClientProperties.TITLE_BAR_SHOW_ICON, false );
+			}
+		};
+	}
+
 	@Override
 	public Dimension getMinimumOptionPaneSize() {
 		return UIScale.scale( super.getMinimumOptionPaneSize() );
@@ -127,7 +157,7 @@ public class FlatOptionPaneUI
 
 		// set icon-message gap
 		if( iconMessageGap > 0 ) {
-			Component iconMessageSeparator = findByName( messageArea, "OptionPane.separator" );
+			Component iconMessageSeparator = SwingUtils.getComponentByName( messageArea, "OptionPane.separator" );
 			if( iconMessageSeparator != null )
 				iconMessageSeparator.setPreferredSize( new Dimension( UIScale.scale( iconMessageGap ), 1 ) );
 		}
@@ -157,15 +187,40 @@ public class FlatOptionPaneUI
 			cons.insets.bottom = UIScale.scale( messagePadding );
 
 		// disable line wrapping for HTML
-		if( msg instanceof String && BasicHTML.isHTMLString( (String) msg ) )
-			maxll = Integer.MAX_VALUE;
+		if( msg != null &&
+			!(msg instanceof Component) &&
+			!(msg instanceof Object[]) &&
+			!(msg instanceof Icon) )
+		{
+			msg = msg.toString();
+			if( BasicHTML.isHTMLString( (String) msg ) )
+				maxll = Integer.MAX_VALUE;
+		}
+
+		// fix right-to-left alignment if super.addMessageComponents() breaks longer lines
+		// into multiple labels and puts them into a box that aligns them to the left
+		if( msg instanceof Box ) {
+			Box box = (Box) msg;
+			if( "OptionPane.verticalBox".equals( box.getName() ) &&
+				box.getLayout() instanceof BoxLayout &&
+				((BoxLayout)box.getLayout()).getAxis() == BoxLayout.Y_AXIS )
+			{
+				box.addPropertyChangeListener( "componentOrientation", e -> {
+					float alignX = box.getComponentOrientation().isLeftToRight() ? 0 : 1;
+					for( Component c : box.getComponents() ) {
+						if( c instanceof JLabel && "OptionPane.label".equals( c.getName() ) )
+							((JLabel)c).setAlignmentX( alignX );
+					}
+				} );
+			}
+		}
 
 		super.addMessageComponents( container, cons, msg, maxll, internallyCreated );
 	}
 
 	private void updateChildPanels( Container c ) {
 		for( Component child : c.getComponents() ) {
-			if( child instanceof JPanel ) {
+			if( child.getClass() == JPanel.class ) {
 				JPanel panel = (JPanel)child;
 
 				// make sub-panel non-opaque for OptionPane.background
@@ -174,53 +229,16 @@ public class FlatOptionPaneUI
 				// use non-UIResource borders to avoid that they are replaced when switching LaF
 				Border border = panel.getBorder();
 				if( border instanceof UIResource )
-					panel.setBorder( new NonUIResourceBorder( border ) );
+					panel.setBorder( FlatUIUtils.nonUIResource( border ) );
 			}
 
-			if( child instanceof Container ) {
+			if( child instanceof Container )
 				updateChildPanels( (Container) child );
-			}
 		}
 	}
 
-	private Component findByName( Container c, String name ) {
-		for( Component child : c.getComponents() ) {
-			if( name.equals( child.getName() ) )
-				return child;
-
-			if( child instanceof Container ) {
-				Component c2 = findByName( (Container) child, name );
-				if( c2 != null )
-					return c2;
-			}
-		}
-		return null;
-	}
-
-	//---- class NonUIResourceBorder ------------------------------------------
-
-	private static class NonUIResourceBorder
-		implements Border
-	{
-		private final Border delegate;
-
-		NonUIResourceBorder( Border delegate ) {
-			this.delegate = delegate;
-		}
-
-		@Override
-		public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
-			delegate.paintBorder( c, g, x, y, width, height );
-		}
-
-		@Override
-		public Insets getBorderInsets( Component c ) {
-			return delegate.getBorderInsets( c );
-		}
-
-		@Override
-		public boolean isBorderOpaque() {
-			return delegate.isBorderOpaque();
-		}
+	@Override
+	protected boolean getSizeButtonsToSameWidth() {
+		return sameSizeButtons;
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatPanelUI.java

@@ -16,9 +16,20 @@
 
 package com.formdev.flatlaf.ui;
 
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.beans.PropertyChangeEvent;
+import java.beans.PropertyChangeListener;
+import java.util.Map;
 import javax.swing.JComponent;
+import javax.swing.JPanel;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicPanelUI;
+import com.formdev.flatlaf.FlatClientProperties;
+import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableUI;
+import com.formdev.flatlaf.util.LoggingFacade;
+import com.formdev.flatlaf.util.UIScale;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JPanel}.
@@ -27,15 +38,128 @@ import javax.swing.plaf.basic.BasicPanelUI;
  *
  * @uiDefault Panel.font				Font	unused
  * @uiDefault Panel.background			Color	only used if opaque
- * @uiDefault Panel.foreground			Color
+ * @uiDefault Panel.foreground			Color	unused
  * @uiDefault Panel.border				Border
  *
  * @author Karl Tauber
  */
 public class FlatPanelUI
 	extends BasicPanelUI
+	implements StyleableUI, PropertyChangeListener
 {
+	// only used via styling (not in UI defaults)
+	/** @since 2 */ @Styleable protected int arc = -1;
+
+	private final boolean shared;
+	private Map<String, Object> oldStyleValues;
+
 	public static ComponentUI createUI( JComponent c ) {
-		return FlatUIUtils.createSharedUI( FlatPanelUI.class, FlatPanelUI::new );
+		return FlatUIUtils.canUseSharedUI( c )
+			? FlatUIUtils.createSharedUI( FlatPanelUI.class, () -> new FlatPanelUI( true ) )
+			: new FlatPanelUI( false );
+	}
+
+	/** @since 2 */
+	protected FlatPanelUI( boolean shared ) {
+		this.shared = shared;
+	}
+
+	@Override
+	public void installUI( JComponent c ) {
+		super.installUI( c );
+
+		c.addPropertyChangeListener( this );
+
+		installStyle( (JPanel) c );
+	}
+
+	@Override
+	public void uninstallUI( JComponent c ) {
+		super.uninstallUI( c );
+
+		c.removePropertyChangeListener( this );
+
+		oldStyleValues = null;
+	}
+
+	/** @since 2.0.1 */
+	@Override
+	public void propertyChange( PropertyChangeEvent e ) {
+		switch( e.getPropertyName() ) {
+			case FlatClientProperties.STYLE:
+			case FlatClientProperties.STYLE_CLASS:
+				JPanel c = (JPanel) e.getSource();
+				if( shared && FlatStylingSupport.hasStyleProperty( c ) ) {
+					// unshare component UI if necessary
+					// updateUI() invokes installStyle() from installUI()
+					c.updateUI();
+				} else
+					installStyle( c );
+				c.revalidate();
+				c.repaint();
+				break;
+		}
+	}
+
+	/** @since 2 */
+	protected void installStyle( JPanel c ) {
+		try {
+			applyStyle( c, FlatStylingSupport.getResolvedStyle( c, "Panel" ) );
+		} catch( RuntimeException ex ) {
+			LoggingFacade.INSTANCE.logSevere( null, ex );
+		}
+	}
+
+	/** @since 2 */
+	protected void applyStyle( JPanel c, Object style ) {
+		oldStyleValues = FlatStylingSupport.parseAndApply( oldStyleValues, style,
+			(key, value) -> applyStyleProperty( c, key, value ) );
+	}
+
+	/** @since 2 */
+	protected Object applyStyleProperty( JPanel c, String key, Object value ) {
+		return FlatStylingSupport.applyToAnnotatedObjectOrComponent( this, c, key, value );
+	}
+
+	/** @since 2 */
+	@Override
+	public Map<String, Class<?>> getStyleableInfos( JComponent c ) {
+		return FlatStylingSupport.getAnnotatedStyleableInfos( this );
+	}
+
+	/** @since 2.5 */
+	@Override
+	public Object getStyleableValue( JComponent c, String key ) {
+		return FlatStylingSupport.getAnnotatedStyleableValue( this, key );
+	}
+
+	@Override
+	public void update( Graphics g, JComponent c ) {
+		// fill background
+		if( c.isOpaque() ) {
+			int width = c.getWidth();
+			int height = c.getHeight();
+			int arc = (this.arc >= 0)
+				? this.arc
+				: ((c.getBorder() instanceof FlatLineBorder)
+					? ((FlatLineBorder)c.getBorder()).getArc()
+					: 0);
+
+			// fill background with parent color to avoid garbage in rounded corners
+			if( arc > 0 )
+				FlatUIUtils.paintParentBackground( g, c );
+
+			g.setColor( c.getBackground() );
+			if( arc > 0 ) {
+				// fill rounded rectangle if having rounded corners
+				Object[] oldRenderingHints = FlatUIUtils.setRenderingHints( g );
+				FlatUIUtils.paintComponentBackground( (Graphics2D) g, 0, 0, width, height,
+					0, UIScale.scale( arc ) );
+				FlatUIUtils.resetRenderingHints( g, oldRenderingHints );
+			} else
+				g.fillRect( 0, 0, width, height );
+		}
+
+		paint( g, c );
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatPasswordFieldUI.java

@@ -17,29 +17,38 @@
 package com.formdev.flatlaf.ui;
 
 import java.awt.Color;
-import java.awt.Dimension;
 import java.awt.Graphics;
-import java.awt.Graphics2D;
+import java.awt.Rectangle;
 import java.awt.Toolkit;
-import java.awt.event.FocusListener;
 import java.awt.event.KeyAdapter;
 import java.awt.event.KeyEvent;
 import java.awt.event.KeyListener;
 import java.beans.PropertyChangeEvent;
+import java.util.Map;
+import javax.swing.Action;
+import javax.swing.ActionMap;
 import javax.swing.Icon;
 import javax.swing.JComponent;
+import javax.swing.JPasswordField;
+import javax.swing.JToggleButton;
 import javax.swing.LookAndFeel;
+import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
-import javax.swing.plaf.basic.BasicPasswordFieldUI;
-import javax.swing.text.Caret;
+import javax.swing.text.DefaultEditorKit;
+import javax.swing.text.Element;
 import javax.swing.text.JTextComponent;
-import com.formdev.flatlaf.util.HiDPIUtils;
+import javax.swing.text.PasswordView;
+import javax.swing.text.View;
+import com.formdev.flatlaf.FlatClientProperties;
+import com.formdev.flatlaf.icons.FlatCapsLockIcon;
+import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
+import com.formdev.flatlaf.util.UIScale;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JPasswordField}.
  *
- * <!-- BasicPasswordFieldUI -->
+ * <!-- BasicTextFieldUI -->
  *
  * @uiDefault PasswordField.font					Font
  * @uiDefault PasswordField.background				Color
@@ -52,68 +61,98 @@ import com.formdev.flatlaf.util.HiDPIUtils;
  * @uiDefault PasswordField.inactiveForeground		Color	used if not enabled (yes, this is confusing; this should be named disabledForeground)
  * @uiDefault PasswordField.border					Border
  * @uiDefault PasswordField.margin					Insets
- * @uiDefault PasswordField.echoChar				character
  * @uiDefault PasswordField.caretBlinkRate			int		default is 500 milliseconds
  *
- * <!-- FlatPasswordFieldUI -->
+ * <!-- FlatTextFieldUI -->
  *
  * @uiDefault Component.minimumWidth				int
  * @uiDefault Component.isIntelliJTheme				boolean
  * @uiDefault PasswordField.placeholderForeground	Color
- * @uiDefault PasswordField.showCapsLock			boolean
- * @uiDefault PasswordField.capsLockIcon			Icon
+ * @uiDefault PasswordField.focusedBackground		Color	optional
+ * @uiDefault PasswordField.iconTextGap				int		optional, default is 4
  * @uiDefault TextComponent.selectAllOnFocusPolicy	String	never, once (default) or always
  * @uiDefault TextComponent.selectAllOnMouseClick	boolean
  *
+ * <!-- FlatPasswordFieldUI -->
+ *
+ * @uiDefault PasswordField.echoChar				character
+ * @uiDefault PasswordField.showCapsLock			boolean
+ * @uiDefault PasswordField.showRevealButton		boolean
+ * @uiDefault PasswordField.capsLockIcon			Icon
+ * @uiDefault PasswordField.revealIcon				Icon
+ *
  * @author Karl Tauber
  */
 public class FlatPasswordFieldUI
-	extends BasicPasswordFieldUI
+	extends FlatTextFieldUI
 {
-	protected int minimumWidth;
-	protected boolean isIntelliJTheme;
-	protected Color placeholderForeground;
-	protected boolean showCapsLock;
-	protected Icon capsLockIcon;
+	// used to preserve reveal button state when switching theme
+	private static final String KEY_REVEAL_SELECTED = "FlatLaf.internal.FlatPasswordFieldUI.revealSelected";
+
+	private Character echoChar;
+
+	@Styleable protected boolean showCapsLock;
+	/** @since 2 */ @Styleable protected boolean showRevealButton;
+	protected Icon capsLockIcon;
+	/** @since 2 */ protected Icon revealIcon;
 
-	private FocusListener focusListener;
 	private KeyListener capsLockListener;
+	private boolean capsLockIconShared = true;
+	private JToggleButton revealButton;
+	private boolean uninstallEchoChar;
 
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatPasswordFieldUI();
 	}
 
+	@Override
+	protected String getPropertyPrefix() {
+		return "PasswordField";
+	}
+
+	@Override
+	public void installUI( JComponent c ) {
+		super.installUI( c );
+
+		installRevealButton();
+	}
+
+	@Override
+	public void uninstallUI( JComponent c ) {
+		uninstallRevealButton();
+
+		super.uninstallUI( c );
+	}
+
 	@Override
 	protected void installDefaults() {
 		super.installDefaults();
 
 		String prefix = getPropertyPrefix();
-		minimumWidth = UIManager.getInt( "Component.minimumWidth" );
-		isIntelliJTheme = UIManager.getBoolean( "Component.isIntelliJTheme" );
-		placeholderForeground = UIManager.getColor( prefix + ".placeholderForeground" );
+		echoChar = (Character) UIManager.get( prefix + ".echoChar" );
+		if( echoChar != null )
+			LookAndFeel.installProperty( getComponent(), "echoChar", echoChar );
+
 		showCapsLock = UIManager.getBoolean( "PasswordField.showCapsLock" );
+		showRevealButton = UIManager.getBoolean( "PasswordField.showRevealButton" );
 		capsLockIcon = UIManager.getIcon( "PasswordField.capsLockIcon" );
-
-		LookAndFeel.installProperty( getComponent(), "opaque", false );
-
-		MigLayoutVisualPadding.install( getComponent() );
+		revealIcon = UIManager.getIcon( "PasswordField.revealIcon" );
+		capsLockIconShared = true;
 	}
 
 	@Override
 	protected void uninstallDefaults() {
 		super.uninstallDefaults();
 
-		placeholderForeground = null;
 		capsLockIcon = null;
-
-		MigLayoutVisualPadding.uninstall( getComponent() );
+		revealIcon = null;
 	}
 
 	@Override
 	protected void installListeners() {
 		super.installListeners();
 
-		focusListener = new FlatUIUtils.RepaintFocusListener( getComponent() );
+		// update caps lock indicator
 		capsLockListener = new KeyAdapter() {
 			@Override
 			public void keyPressed( KeyEvent e ) {
@@ -124,12 +163,13 @@ public class FlatPasswordFieldUI
 				repaint( e );
 			}
 			private void repaint( KeyEvent e ) {
-				if( e.getKeyCode() == KeyEvent.VK_CAPS_LOCK )
+				if( e.getKeyCode() == KeyEvent.VK_CAPS_LOCK ) {
 					e.getComponent().repaint();
+					scrollCaretToVisible();
+				}
 			}
 		};
 
-		getComponent().addFocusListener( focusListener );
 		getComponent().addKeyListener( capsLockListener );
 	}
 
@@ -137,59 +177,216 @@ public class FlatPasswordFieldUI
 	protected void uninstallListeners() {
 		super.uninstallListeners();
 
-		getComponent().removeFocusListener( focusListener );
 		getComponent().removeKeyListener( capsLockListener );
-		focusListener = null;
 		capsLockListener = null;
 	}
 
 	@Override
-	protected Caret createCaret() {
-		return new FlatCaret( UIManager.getString( "TextComponent.selectAllOnFocusPolicy" ),
-			UIManager.getBoolean( "TextComponent.selectAllOnMouseClick" ) );
+	protected void installKeyboardActions() {
+		super.installKeyboardActions();
+
+		// map "select-word" action (double-click) to "select-line" action
+		ActionMap map = SwingUtilities.getUIActionMap( getComponent() );
+		if( map != null && map.get( DefaultEditorKit.selectWordAction ) != null ) {
+			Action selectLineAction = map.get( DefaultEditorKit.selectLineAction );
+			if( selectLineAction != null )
+				map.put( DefaultEditorKit.selectWordAction, selectLineAction );
+		}
+	}
+
+	/** @since 2 */
+	@Override
+	String getStyleType() {
+		return "PasswordField";
+	}
+
+	@Override
+	protected void applyStyle( Object style ) {
+		boolean oldShowRevealButton = showRevealButton;
+
+		super.applyStyle( style );
+
+		if( showRevealButton != oldShowRevealButton ) {
+			uninstallRevealButton();
+			installRevealButton();
+		}
+	}
+
+	/** @since 2 */
+	@Override
+	protected Object applyStyleProperty( String key, Object value ) {
+		if( key.equals( "capsLockIconColor" ) && capsLockIcon instanceof FlatCapsLockIcon ) {
+			if( capsLockIconShared ) {
+				capsLockIcon = FlatStylingSupport.cloneIcon( capsLockIcon );
+				capsLockIconShared = false;
+			}
+			return ((FlatCapsLockIcon)capsLockIcon).applyStyleProperty( key, value );
+		}
+
+		return super.applyStyleProperty( key, value );
+	}
+
+	/** @since 2 */
+	@Override
+	public Map<String, Class<?>> getStyleableInfos( JComponent c ) {
+		Map<String, Class<?>> infos = super.getStyleableInfos( c );
+		infos.put( "capsLockIconColor", Color.class );
+		return infos;
+	}
+
+	@Override
+	public Object getStyleableValue( JComponent c, String key ) {
+		if( key.equals( "capsLockIconColor" ) && capsLockIcon instanceof FlatCapsLockIcon )
+			return ((FlatCapsLockIcon)capsLockIcon).getStyleableValue( key );
+
+		return super.getStyleableValue( c, key );
+	}
+
+	@Override
+	public View create( Element elem ) {
+		return new PasswordView( elem );
+	}
+
+	/** @since 2 */
+	@Override
+	protected void paintIcons( Graphics g, Rectangle r ) {
+		super.paintIcons( g, r );
+
+		if( isCapsLockVisible() )
+			paintCapsLock( g, r );
+	}
+
+	/** @since 2 */
+	protected void paintCapsLock( Graphics g, Rectangle r ) {
+		JTextComponent c = getComponent();
+		int x = c.getComponentOrientation().isLeftToRight()
+			? r.x + r.width - capsLockIcon.getIconWidth()
+			: r.x;
+		int y = r.y + Math.round( (r.height - capsLockIcon.getIconHeight()) / 2f );
+		capsLockIcon.paintIcon( c, g, x, y );
+	}
+
+	/** @since 2 */
+	@Override
+	protected boolean hasTrailingIcon() {
+		return super.hasTrailingIcon() || isCapsLockVisible();
+	}
+
+	/** @since 2 */
+	@Override
+	protected int getTrailingIconWidth() {
+		return super.getTrailingIconWidth()
+			+ (isCapsLockVisible() ? capsLockIcon.getIconWidth() + UIScale.scale( iconTextGap ) : 0);
+	}
+
+	/** @since 1.4 */
+	protected boolean isCapsLockVisible() {
+		if( !showCapsLock )
+			return false;
+
+		return FlatUIUtils.isPermanentFocusOwner( getComponent() ) &&
+			Toolkit.getDefaultToolkit().getLockingKeyState( KeyEvent.VK_CAPS_LOCK );
+	}
+
+	/** @since 2 */
+	protected void installRevealButton() {
+		if( showRevealButton ) {
+			revealButton = createRevealButton();
+			updateRevealButton();
+			installLayout();
+			getComponent().add( revealButton );
+		}
+	}
+
+	/** @since 2 */
+	protected JToggleButton createRevealButton() {
+		JPasswordField c = (JPasswordField) getComponent();
+		JToggleButton button = new JToggleButton( revealIcon, !c.echoCharIsSet() );
+		button.setName( "PasswordField.revealButton" );
+		prepareLeadingOrTrailingComponent( button );
+		button.putClientProperty( FlatClientProperties.STYLE_CLASS, "inTextField revealButton" );
+		if( FlatClientProperties.clientPropertyBoolean( c, KEY_REVEAL_SELECTED, false ) ) {
+			button.setSelected( true );
+			updateEchoChar( true );
+		}
+		button.addActionListener( e -> {
+			boolean selected = button.isSelected();
+			updateEchoChar( selected );
+			c.putClientProperty( KEY_REVEAL_SELECTED, selected );
+		} );
+		return button;
+	}
+
+	/** @since 2.5 */
+	protected void updateRevealButton() {
+		if( revealButton == null )
+			return;
+
+		JTextComponent c = getComponent();
+		boolean visible = c.isEnabled();
+		if( visible != revealButton.isVisible() ) {
+			revealButton.setVisible( visible );
+			c.revalidate();
+			c.repaint();
+
+			if( !visible ) {
+				revealButton.setSelected( false );
+				updateEchoChar( false );
+				getComponent().putClientProperty( KEY_REVEAL_SELECTED, null );
+			}
+		}
 	}
 
 	@Override
 	protected void propertyChange( PropertyChangeEvent e ) {
 		super.propertyChange( e );
-		FlatTextFieldUI.propertyChange( getComponent(), e );
+
+		switch( e.getPropertyName() ) {
+			case "enabled":
+				updateRevealButton();
+				break;
+		}
 	}
 
-	@Override
-	protected void paintSafely( Graphics g ) {
-		FlatTextFieldUI.paintBackground( g, getComponent(), isIntelliJTheme );
-		FlatTextFieldUI.paintPlaceholder( g, getComponent(), placeholderForeground );
-		paintCapsLock( g );
+	private void updateEchoChar( boolean selected ) {
+		char newEchoChar = selected
+			? 0
+			: (echoChar != null ? echoChar : '*');
 
-		super.paintSafely( HiDPIUtils.createGraphicsTextYCorrection( (Graphics2D) g ) );
-	}
-
-	protected void paintCapsLock( Graphics g ) {
-		if( !showCapsLock )
+		JPasswordField c = (JPasswordField) getComponent();
+		if( newEchoChar == c.getEchoChar() )
 			return;
 
-		JTextComponent c = getComponent();
-		if( !FlatUIUtils.isPermanentFocusOwner( c ) ||
-			!Toolkit.getDefaultToolkit().getLockingKeyState( KeyEvent.VK_CAPS_LOCK ) )
-		  return;
+		// set echo char
+		LookAndFeel.installProperty( c, "echoChar", newEchoChar );
 
-		int y = (c.getHeight() - capsLockIcon.getIconHeight()) / 2;
-		int x = c.getWidth() - capsLockIcon.getIconWidth() - y;
-		capsLockIcon.paintIcon( c, g, x, y );
+		// check whether was able to set echo char via LookAndFeel.installProperty()
+		// if not, then echo char was explicitly changed via JPasswordField.setEchoChar()
+		char actualEchoChar = c.getEchoChar();
+		if( actualEchoChar != newEchoChar ) {
+			if( selected && actualEchoChar != 0 ) {
+				// use explicitly set echo char
+				echoChar = actualEchoChar;
+				uninstallEchoChar = true;
+			}
+
+			c.setEchoChar( newEchoChar );
+		}
+	}
+
+	/** @since 2 */
+	protected void uninstallRevealButton() {
+		if( revealButton != null ) {
+			if( uninstallEchoChar && revealButton.isSelected() )
+				((JPasswordField)getComponent()).setEchoChar( echoChar );
+
+			getComponent().remove( revealButton );
+			revealButton = null;
+		}
 	}
 
 	@Override
-	protected void paintBackground( Graphics g ) {
-		// background is painted elsewhere
-	}
-
-	@Override
-	public Dimension getPreferredSize( JComponent c ) {
-		return FlatTextFieldUI.applyMinimumWidth( c, super.getPreferredSize( c ), minimumWidth );
-	}
-
-	@Override
-	public Dimension getMinimumSize( JComponent c ) {
-		return FlatTextFieldUI.applyMinimumWidth( c, super.getMinimumSize( c ), minimumWidth );
+	protected JComponent[] getTrailingComponents() {
+		return new JComponent[] { trailingComponent, revealButton, clearButton };
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatPopupFactory.java

@@ -16,19 +16,29 @@
 
 package com.formdev.flatlaf.ui;
 
+import java.awt.AWTEvent;
 import java.awt.Color;
 import java.awt.Component;
 import java.awt.Container;
 import java.awt.Dimension;
+import java.awt.EventQueue;
+import java.awt.GraphicsConfiguration;
+import java.awt.GraphicsDevice;
+import java.awt.GraphicsEnvironment;
 import java.awt.Insets;
 import java.awt.MouseInfo;
 import java.awt.Panel;
 import java.awt.Point;
+import java.awt.PointerInfo;
 import java.awt.Rectangle;
+import java.awt.Toolkit;
 import java.awt.Window;
 import java.awt.event.ComponentEvent;
 import java.awt.event.ComponentListener;
-import java.lang.reflect.InvocationTargetException;
+import java.awt.event.MouseEvent;
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodType;
 import java.lang.reflect.Method;
 import javax.swing.JComponent;
 import javax.swing.JLayeredPane;
@@ -39,6 +49,7 @@ import javax.swing.Popup;
 import javax.swing.PopupFactory;
 import javax.swing.RootPaneContainer;
 import javax.swing.SwingUtilities;
+import javax.swing.ToolTipManager;
 import javax.swing.UIManager;
 import javax.swing.border.Border;
 import com.formdev.flatlaf.FlatClientProperties;
@@ -55,14 +66,14 @@ import com.formdev.flatlaf.util.UIScale;
 public class FlatPopupFactory
 	extends PopupFactory
 {
-	private Method java8getPopupMethod;
-	private Method java9getPopupMethod;
+	private MethodHandle java8getPopupMethod;
+	private MethodHandle java9getPopupMethod;
 
 	@Override
 	public Popup getPopup( Component owner, Component contents, int x, int y )
 		throws IllegalArgumentException
 	{
-		Point pt = fixToolTipLocation( contents, x, y );
+		Point pt = fixToolTipLocation( owner, contents, x, y );
 		if( pt != null ) {
 			x = pt.x;
 			y = pt.y;
@@ -70,7 +81,7 @@ public class FlatPopupFactory
 
 		boolean forceHeavyWeight = isOptionEnabled( owner, contents, FlatClientProperties.POPUP_FORCE_HEAVY_WEIGHT, "Popup.forceHeavyWeight" );
 
-		if( !isOptionEnabled( owner, contents, FlatClientProperties.POPUP_DROP_SHADOW_PAINTED, "Popup.dropShadowPainted" ) || SystemInfo.isProjector )
+		if( !isOptionEnabled( owner, contents, FlatClientProperties.POPUP_DROP_SHADOW_PAINTED, "Popup.dropShadowPainted" ) || SystemInfo.isProjector || SystemInfo.isWebswing )
 			return new NonFlashingPopup( getPopupForScreenOfOwner( owner, contents, x, y, forceHeavyWeight ), contents );
 
 		// macOS and Linux adds drop shadow to heavy weight popups
@@ -115,6 +126,10 @@ public class FlatPopupFactory
 				popupWindow.getGraphicsConfiguration() == owner.getGraphicsConfiguration() )
 			  return popup;
 
+			// avoid endless loop (should newer happen; PopupFactory cache size is 5)
+			if( ++count > 10 )
+				return popup;
+
 			// remove contents component from popup window
 			if( popupWindow instanceof JWindow )
 				((JWindow)popupWindow).getContentPane().removeAll();
@@ -122,10 +137,6 @@ public class FlatPopupFactory
 			// dispose unused popup
 			// (do not invoke popup.hide() because this would cache the popup window)
 			popupWindow.dispose();
-
-			// avoid endless loop (should newer happen; PopupFactory cache size is 5)
-			if( ++count > 10 )
-				return popup;
 		}
 	}
 
@@ -134,7 +145,7 @@ public class FlatPopupFactory
 	 * <p>
 	 * On a dual screen setup, where screens use different scale factors, it may happen
 	 * that the window location changes when showing a heavy weight popup window.
-	 * E.g. when opening an dialog on the secondary screen and making combobox popup visible.
+	 * E.g. when opening a dialog on the secondary screen and making combobox popup visible.
 	 * <p>
 	 * This is a workaround for https://bugs.openjdk.java.net/browse/JDK-8224608
 	 */
@@ -183,40 +194,46 @@ public class FlatPopupFactory
 	{
 		try {
 			if( SystemInfo.isJava_9_orLater ) {
+				// Java 9: protected Popup getPopup( Component owner, Component contents, int x, int y, boolean isHeavyWeightPopup )
 				if( java9getPopupMethod == null ) {
-					java9getPopupMethod = PopupFactory.class.getDeclaredMethod(
-						"getPopup", Component.class, Component.class, int.class, int.class, boolean.class );
+					MethodType mt = MethodType.methodType( Popup.class, Component.class, Component.class, int.class, int.class, boolean.class );
+					java9getPopupMethod = MethodHandles.lookup().findVirtual( PopupFactory.class, "getPopup", mt );
 				}
 				return (Popup) java9getPopupMethod.invoke( this, owner, contents, x, y, true );
 			} else {
-				// Java 8
+				// Java 8: private Popup getPopup( Component owner, Component contents, int ownerX, int ownerY, int popupType )
 				if( java8getPopupMethod == null ) {
-					java8getPopupMethod = PopupFactory.class.getDeclaredMethod(
+					Method m = PopupFactory.class.getDeclaredMethod(
 						"getPopup", Component.class, Component.class, int.class, int.class, int.class );
-					java8getPopupMethod.setAccessible( true );
+					m.setAccessible( true );
+					java8getPopupMethod = MethodHandles.lookup().unreflect( m );
 				}
 				return (Popup) java8getPopupMethod.invoke( this, owner, contents, x, y, /*HEAVY_WEIGHT_POPUP*/ 2 );
 			}
-		} catch( NoSuchMethodException | SecurityException | IllegalAccessException | InvocationTargetException ex ) {
-			// ignore
-			return null;
+		} catch( Throwable ex ) {
+			// fallback
+			return super.getPopup( owner, contents, x, y );
 		}
 	}
 
 	/**
 	 * Usually ToolTipManager places a tooltip at (mouseLocation.x, mouseLocation.y + 20).
 	 * In case that the tooltip would be partly outside of the screen,
-	 * ToolTipManagerthe changes the location so that the entire tooltip fits on screen.
+	 * the ToolTipManager changes the location so that the entire tooltip fits on screen.
 	 * But this can place the tooltip under the mouse location and hide the owner component.
 	 * <p>
 	 * This method checks whether the current mouse location is within tooltip bounds
 	 * and corrects the y-location so that the tooltip is placed above the mouse location.
 	 */
-	private Point fixToolTipLocation( Component contents, int x, int y ) {
-		if( !(contents instanceof JToolTip) || !wasInvokedFromToolTipManager() )
+	private Point fixToolTipLocation( Component owner, Component contents, int x, int y ) {
+		if( !(contents instanceof JToolTip) || !wasInvokedFromToolTipManager() || hasTipLocation( owner ) )
 			return null;
 
-		Point mouseLocation = MouseInfo.getPointerInfo().getLocation();
+		PointerInfo pointerInfo = MouseInfo.getPointerInfo();
+		if( pointerInfo == null )
+			return null;
+
+		Point mouseLocation = pointerInfo.getLocation();
 		Dimension tipSize = contents.getPreferredSize();
 
 		// check whether mouse location is within tooltip bounds
@@ -224,18 +241,63 @@ public class FlatPopupFactory
 		if( !tipBounds.contains( mouseLocation ) )
 			return null;
 
-		// place tooltip above mouse location
-		return new Point( x, mouseLocation.y - tipSize.height - UIScale.scale( 20 ) );
+		// find GraphicsConfiguration at mouse location (similar to ToolTipManager.getDrawingGC())
+		GraphicsConfiguration gc = null;
+		for( GraphicsDevice device : GraphicsEnvironment.getLocalGraphicsEnvironment().getScreenDevices() ) {
+			GraphicsConfiguration dgc = device.getDefaultConfiguration();
+			if( dgc.getBounds().contains( mouseLocation ) ) {
+				gc = dgc;
+				break;
+			}
+		}
+		if( gc == null )
+			gc = owner.getGraphicsConfiguration();
+		if( gc == null )
+			return null;
+
+		Rectangle screenBounds = gc.getBounds();
+		Insets screenInsets = Toolkit.getDefaultToolkit().getScreenInsets( gc );
+		int screenTop = screenBounds.y + screenInsets.top;
+
+		// place tooltip above mouse location if there is enough space
+		int newY =  mouseLocation.y - tipSize.height - UIScale.scale( 20 );
+		if( newY < screenTop )
+			return null;
+
+		return new Point( x, newY );
 	}
 
 	private boolean wasInvokedFromToolTipManager() {
-		StackTraceElement[] stackTrace = Thread.currentThread().getStackTrace();
-		for( StackTraceElement stackTraceElement : stackTrace ) {
-			if( "javax.swing.ToolTipManager".equals( stackTraceElement.getClassName() ) &&
-				"showTipWindow".equals( stackTraceElement.getMethodName() ) )
-			  return true;
+		return StackUtils.wasInvokedFrom( ToolTipManager.class.getName(), "showTipWindow", 8 );
+	}
+
+	/**
+	 * Checks whether the owner component returns a tooltip location in
+	 * JComponent.getToolTipLocation(MouseEvent).
+	 */
+	private boolean hasTipLocation( Component owner ) {
+		if( !(owner instanceof JComponent) )
+			return false;
+
+		AWTEvent e = EventQueue.getCurrentEvent();
+		MouseEvent me;
+		if( e instanceof MouseEvent )
+			me = (MouseEvent) e;
+		else {
+			// no mouse event available because a timer is used to show the tooltip
+			// --> create mouse event from current mouse location
+			PointerInfo pointerInfo = MouseInfo.getPointerInfo();
+			if( pointerInfo == null )
+				return false;
+
+			Point location = new Point( pointerInfo.getLocation());
+			SwingUtilities.convertPointFromScreen( location, owner );
+			me = new MouseEvent( owner, MouseEvent.MOUSE_MOVED, System.currentTimeMillis(),
+				0, location.x, location.y, 0, false );
 		}
-		return false;
+
+		return me.getSource() == owner &&
+			((JComponent)owner).getToolTipLocation( me ) != null;
 	}
 
 	//---- class NonFlashingPopup ---------------------------------------------
@@ -463,6 +525,9 @@ public class FlatPopupFactory
 			JLayeredPane layeredPane = ((RootPaneContainer)window).getLayeredPane();
 			layeredPane.add( dropShadowPanel, JLayeredPane.POPUP_LAYER, 0 );
 
+			moveMediumWeightDropShadow();
+			resizeMediumWeightDropShadow();
+
 			mediumPanelListener = new ComponentListener() {
 				@Override
 				public void componentShown( ComponentEvent e ) {
@@ -478,17 +543,12 @@ public class FlatPopupFactory
 
 				@Override
 				public void componentMoved( ComponentEvent e ) {
-					if( dropShadowPanel != null && mediumWeightPanel != null ) {
-						Point location = mediumWeightPanel.getLocation();
-						Insets insets = dropShadowPanel.getInsets();
-						dropShadowPanel.setLocation( location.x - insets.left, location.y - insets.top );
-					}
+					moveMediumWeightDropShadow();
 				}
 
 				@Override
 				public void componentResized( ComponentEvent e ) {
-					if( dropShadowPanel != null )
-						dropShadowPanel.setSize( FlatUIUtils.addInsets( mediumWeightPanel.getSize(), dropShadowPanel.getInsets() ) );
+					resizeMediumWeightDropShadow();
 				}
 			};
 			mediumWeightPanel.addComponentListener( mediumPanelListener );
@@ -504,5 +564,18 @@ public class FlatPopupFactory
 				parent.repaint( bounds.x, bounds.y, bounds.width, bounds.height );
 			}
 		}
+
+		private void moveMediumWeightDropShadow() {
+			if( dropShadowPanel != null && mediumWeightPanel != null ) {
+				Point location = mediumWeightPanel.getLocation();
+				Insets insets = dropShadowPanel.getInsets();
+				dropShadowPanel.setLocation( location.x - insets.left, location.y - insets.top );
+			}
+		}
+
+		private void resizeMediumWeightDropShadow() {
+			if( dropShadowPanel != null && mediumWeightPanel != null )
+				dropShadowPanel.setSize( FlatUIUtils.addInsets( mediumWeightPanel.getSize(), dropShadowPanel.getInsets() ) );
+		}
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatPopupMenuBorder.java

@@ -16,11 +16,15 @@
 
 package com.formdev.flatlaf.ui;
 
+import java.awt.Color;
 import java.awt.Component;
 import java.awt.Container;
 import java.awt.Insets;
+import java.util.Map;
 import javax.swing.JScrollPane;
 import javax.swing.UIManager;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableBorder;
+import com.formdev.flatlaf.ui.FlatStylingSupport.UnknownStyleException;
 import com.formdev.flatlaf.util.UIScale;
 
 /**
@@ -33,12 +37,50 @@ import com.formdev.flatlaf.util.UIScale;
  */
 public class FlatPopupMenuBorder
 	extends FlatLineBorder
+	implements StyleableBorder
 {
+	private Color borderColor;
+
 	public FlatPopupMenuBorder() {
 		super( UIManager.getInsets( "PopupMenu.borderInsets" ),
 			UIManager.getColor( "PopupMenu.borderColor" ) );
 	}
 
+	/** @since 2 */
+	@Override
+	public Object applyStyleProperty( String key, Object value ) {
+		Object oldValue;
+		switch( key ) {
+			case "borderInsets": return applyStyleProperty( (Insets) value );
+			case "borderColor": oldValue = getLineColor(); borderColor = (Color) value; return oldValue;
+		}
+		throw new UnknownStyleException( key );
+	}
+
+	/** @since 2 */
+	@Override
+	public Map<String, Class<?>> getStyleableInfos() {
+		Map<String, Class<?>> infos = new FlatStylingSupport.StyleableInfosMap<>();
+		infos.put( "borderInsets", Insets.class );
+		infos.put( "borderColor", Color.class );
+		return infos;
+	}
+
+	/** @since 2.5 */
+	@Override
+	public Object getStyleableValue( String key ) {
+		switch( key ) {
+			case "borderInsets": return getStyleableValue();
+			case "borderColor": return borderColor;
+		}
+		return null;
+	}
+
+	@Override
+	public Color getLineColor() {
+		return (borderColor != null) ? borderColor : super.getLineColor();
+	}
+
 	@Override
 	public Insets getBorderInsets( Component c, Insets insets ) {
 		if( c instanceof Container &&

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatPopupMenuSeparatorUI.java

@@ -24,8 +24,8 @@ import javax.swing.plaf.ComponentUI;
  *
  * <!-- BasicSeparatorUI -->
  *
- * @uiDefault PopupMenuSeparator.background		Color	unused
- * @uiDefault PopupMenuSeparator.foreground		Color
+ * @uiDefault Separator.background				Color	unused
+ * @uiDefault Separator.foreground				Color
  *
  * <!-- FlatSeparatorUI -->
  *
@@ -39,11 +39,24 @@ public class FlatPopupMenuSeparatorUI
 	extends FlatSeparatorUI
 {
 	public static ComponentUI createUI( JComponent c ) {
-		return FlatUIUtils.createSharedUI( FlatPopupMenuSeparatorUI.class, FlatPopupMenuSeparatorUI::new );
+		return FlatUIUtils.canUseSharedUI( c )
+			? FlatUIUtils.createSharedUI( FlatPopupMenuSeparatorUI.class, () -> new FlatPopupMenuSeparatorUI( true ) )
+			: new FlatPopupMenuSeparatorUI( false );
+	}
+
+	/** @since 2 */
+	protected FlatPopupMenuSeparatorUI( boolean shared ) {
+		super( shared );
 	}
 
 	@Override
 	protected String getPropertyPrefix() {
 		return "PopupMenuSeparator";
 	}
+
+	/** @since 2 */
+	@Override
+	String getStyleType() {
+		return "PopupMenuSeparator";
+	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatPopupMenuUI.java

@@ -16,9 +16,60 @@
 
 package com.formdev.flatlaf.ui;
 
+import java.awt.BorderLayout;
+import java.awt.Color;
+import java.awt.Component;
+import java.awt.Container;
+import java.awt.Dimension;
+import java.awt.EventQueue;
+import java.awt.Graphics;
+import java.awt.GraphicsConfiguration;
+import java.awt.GraphicsDevice;
+import java.awt.GraphicsEnvironment;
+import java.awt.Insets;
+import java.awt.LayoutManager;
+import java.awt.Point;
+import java.awt.Rectangle;
+import java.awt.Toolkit;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseListener;
+import java.awt.event.MouseWheelEvent;
+import java.awt.event.MouseWheelListener;
+import java.beans.PropertyChangeListener;
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicBoolean;
+import javax.swing.BoxLayout;
+import javax.swing.JButton;
 import javax.swing.JComponent;
+import javax.swing.JMenuItem;
+import javax.swing.JPanel;
+import javax.swing.JPopupMenu;
+import javax.swing.JScrollPane;
+import javax.swing.JViewport;
+import javax.swing.MenuElement;
+import javax.swing.MenuSelectionManager;
+import javax.swing.Popup;
+import javax.swing.PopupFactory;
+import javax.swing.SwingConstants;
+import javax.swing.SwingUtilities;
+import javax.swing.Timer;
+import javax.swing.UIManager;
+import javax.swing.event.MenuKeyEvent;
+import javax.swing.event.MenuKeyListener;
+import javax.swing.event.PopupMenuEvent;
+import javax.swing.event.PopupMenuListener;
+import javax.swing.plaf.ButtonUI;
 import javax.swing.plaf.ComponentUI;
+import javax.swing.plaf.UIResource;
+import javax.swing.plaf.basic.BasicComboPopup;
+import javax.swing.plaf.basic.BasicMenuItemUI;
 import javax.swing.plaf.basic.BasicPopupMenuUI;
+import javax.swing.plaf.basic.DefaultMenuLayout;
+import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableUI;
+import com.formdev.flatlaf.util.LoggingFacade;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JPopupMenu}.
@@ -30,12 +81,380 @@ import javax.swing.plaf.basic.BasicPopupMenuUI;
  * @uiDefault PopupMenu.foreground						Color
  * @uiDefault PopupMenu.border							Border
  *
+ * <!-- FlatPopupMenuUI -->
+ *
+ * @uiDefault Component.arrowType					String	chevron (default) or triangle
+ * @uiDefault PopupMenu.scrollArrowColor			Color
+ * @uiDefault PopupMenu.hoverScrollArrowBackground	Color	optional
+ *
  * @author Karl Tauber
  */
 public class FlatPopupMenuUI
 	extends BasicPopupMenuUI
+	implements StyleableUI
 {
+	/** @since 2.1 */ @Styleable protected String arrowType;
+	/** @since 2.1 */ @Styleable protected Color scrollArrowColor;
+	/** @since 2.1 */ @Styleable protected Color hoverScrollArrowBackground;
+
+	private PropertyChangeListener propertyChangeListener;
+	private Map<String, Object> oldStyleValues;
+	private AtomicBoolean borderShared;
+
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatPopupMenuUI();
 	}
+
+	@Override
+	public void installUI( JComponent c ) {
+		super.installUI( c );
+
+		installStyle();
+	}
+
+	@Override
+	public void uninstallUI( JComponent c ) {
+		super.uninstallUI( c );
+
+		oldStyleValues = null;
+		borderShared = null;
+	}
+
+	@Override
+	public void installDefaults() {
+		super.installDefaults();
+
+		arrowType = UIManager.getString( "Component.arrowType" );
+		scrollArrowColor = UIManager.getColor( "PopupMenu.scrollArrowColor" );
+		hoverScrollArrowBackground = UIManager.getColor( "PopupMenu.hoverScrollArrowBackground" );
+
+		LayoutManager layout = popupMenu.getLayout();
+		if( layout == null || layout instanceof UIResource )
+			popupMenu.setLayout( new FlatPopupMenuLayout( popupMenu, BoxLayout.Y_AXIS ) );
+	}
+
+	@Override
+	protected void uninstallDefaults() {
+		super.uninstallDefaults();
+
+		scrollArrowColor = null;
+		hoverScrollArrowBackground = null;
+	}
+
+	@Override
+	protected void installListeners() {
+		super.installListeners();
+
+		propertyChangeListener = FlatStylingSupport.createPropertyChangeListener( popupMenu, this::installStyle, null );
+		popupMenu.addPropertyChangeListener( propertyChangeListener );
+	}
+
+	@Override
+	protected void uninstallListeners() {
+		super.uninstallListeners();
+
+		popupMenu.removePropertyChangeListener( propertyChangeListener );
+		propertyChangeListener = null;
+	}
+
+	/** @since 2 */
+	protected void installStyle() {
+		try {
+			applyStyle( FlatStylingSupport.getResolvedStyle( popupMenu, "PopupMenu" ) );
+		} catch( RuntimeException ex ) {
+			LoggingFacade.INSTANCE.logSevere( null, ex );
+		}
+	}
+
+	/** @since 2 */
+	protected void applyStyle( Object style ) {
+		oldStyleValues = FlatStylingSupport.parseAndApply( oldStyleValues, style, this::applyStyleProperty );
+	}
+
+	/** @since 2 */
+	protected Object applyStyleProperty( String key, Object value ) {
+		if( borderShared == null )
+			borderShared = new AtomicBoolean( true );
+		return FlatStylingSupport.applyToAnnotatedObjectOrBorder( this, key, value, popupMenu, borderShared );
+	}
+
+	/** @since 2 */
+	@Override
+	public Map<String, Class<?>> getStyleableInfos( JComponent c ) {
+		return FlatStylingSupport.getAnnotatedStyleableInfos( this, popupMenu.getBorder() );
+	}
+
+	/** @since 2.5 */
+	@Override
+	public Object getStyleableValue( JComponent c, String key ) {
+		return FlatStylingSupport.getAnnotatedStyleableValue( this, popupMenu.getBorder(), key );
+	}
+
+	@Override
+	public Popup getPopup( JPopupMenu popup, int x, int y ) {
+		// do not add scroller to combobox popups or to popups that already have a scroll pane
+		if( popup instanceof BasicComboPopup ||
+			(popup.getComponentCount() > 0 && popup.getComponent( 0 ) instanceof JScrollPane) )
+		  return super.getPopup( popup, x, y );
+
+		// do not add scroller if popup fits into screen
+		Dimension prefSize = popup.getPreferredSize();
+		int screenHeight = getScreenHeightAt( x, y );
+		if( prefSize.height <= screenHeight )
+			return super.getPopup( popup, x, y );
+
+		// create scroller
+		FlatPopupScroller scroller = new FlatPopupScroller( popup );
+		scroller.setPreferredSize( new Dimension( prefSize.width, screenHeight ) );
+
+		// create popup
+		PopupFactory popupFactory = PopupFactory.getSharedInstance();
+		return popupFactory.getPopup( popup.getInvoker(), scroller, x, y );
+	}
+
+	private int getScreenHeightAt( int x, int y ) {
+		// find GraphicsConfiguration at popup location (similar to JPopupMenu.getCurrentGraphicsConfiguration())
+		GraphicsConfiguration gc = null;
+		for( GraphicsDevice device : GraphicsEnvironment.getLocalGraphicsEnvironment().getScreenDevices() ) {
+			if( device.getType() == GraphicsDevice.TYPE_RASTER_SCREEN ) {
+				GraphicsConfiguration dgc = device.getDefaultConfiguration();
+				if( dgc.getBounds().contains( x, y ) ) {
+					gc = dgc;
+					break;
+				}
+			}
+		}
+		if( gc == null && popupMenu.getInvoker() != null )
+			gc = popupMenu.getInvoker().getGraphicsConfiguration();
+
+		// compute screen height
+		// (always subtract screen insets because there is no API to detect whether
+		// the popup can overlap the taskbar; see JPopupMenu.canPopupOverlapTaskBar())
+		Toolkit toolkit = Toolkit.getDefaultToolkit();
+		Rectangle screenBounds = (gc != null) ? gc.getBounds() : new Rectangle( toolkit.getScreenSize() );
+		Insets screenInsets = Toolkit.getDefaultToolkit().getScreenInsets( gc );
+		return screenBounds.height - screenInsets.top - screenInsets.bottom;
+	}
+
+	//---- class FlatPopupMenuLayout ------------------------------------------
+
+	/**
+	 * @since 2.4
+	 */
+	protected static class FlatPopupMenuLayout
+		extends DefaultMenuLayout
+	{
+		public FlatPopupMenuLayout( Container target, int axis ) {
+			super( target, axis );
+		}
+
+		@Override
+		public Dimension preferredLayoutSize( Container target ) {
+			FlatMenuItemRenderer.clearClientProperties( target );
+
+			return super.preferredLayoutSize( target );
+		}
+	}
+
+	//---- class FlatPopupScroller --------------------------------------------
+
+	private class FlatPopupScroller
+		extends JPanel
+		implements MouseWheelListener, PopupMenuListener, MenuKeyListener
+	{
+		private final JPopupMenu popup;
+
+		private final JScrollPane scrollPane;
+		private final JButton scrollUpButton;
+		private final JButton scrollDownButton;
+		private int unitIncrement;
+
+		FlatPopupScroller( JPopupMenu popup ) {
+			super( new BorderLayout() );
+			this.popup = popup;
+
+			// this panel is required to avoid that JPopupMenu.setLocation() will be invoked
+			// while scrolling, because this would call JPopupMenu.showPopup()
+			JPanel view = new JPanel( new BorderLayout() );
+			view.add( popup, BorderLayout.CENTER );
+
+			scrollPane = new JScrollPane( view, JScrollPane.VERTICAL_SCROLLBAR_NEVER, JScrollPane.HORIZONTAL_SCROLLBAR_NEVER );
+			scrollPane.setBorder( null );
+
+			scrollUpButton = new ArrowButton( SwingConstants.NORTH );
+			scrollDownButton = new ArrowButton( SwingConstants.SOUTH );
+
+			add( scrollPane, BorderLayout.CENTER );
+			add( scrollUpButton, BorderLayout.NORTH );
+			add( scrollDownButton, BorderLayout.SOUTH );
+
+			setBackground( popup.getBackground() );
+			setBorder( popup.getBorder() );
+			popup.setBorder( null );
+
+			popup.addPopupMenuListener( this );
+			popup.addMouseWheelListener( this );
+			popup.addMenuKeyListener( this );
+
+			updateArrowButtons();
+		}
+
+		void scroll( int unitsToScroll ) {
+			if( unitIncrement == 0 )
+				unitIncrement = new JMenuItem( "X" ).getPreferredSize().height;
+
+			JViewport viewport = scrollPane.getViewport();
+			Point viewPosition = viewport.getViewPosition();
+			int newY = viewPosition.y + (unitIncrement * unitsToScroll);
+			if( newY < 0 )
+				newY = 0;
+			else
+				newY = Math.min( newY, viewport.getViewSize().height - viewport.getExtentSize().height );
+			viewport.setViewPosition( new Point( viewPosition.x, newY ) );
+
+			updateArrowButtons();
+		}
+
+		void updateArrowButtons() {
+			JViewport viewport = scrollPane.getViewport();
+			Point viewPosition = viewport.getViewPosition();
+
+			scrollUpButton.setVisible( viewPosition.y > 0 );
+			scrollDownButton.setVisible( viewPosition.y < viewport.getViewSize().height - viewport.getExtentSize().height );
+		}
+
+		//---- interface PopupMenuListener ----
+
+		@Override
+		public void popupMenuWillBecomeInvisible( PopupMenuEvent e ) {
+			// restore popup border
+			popup.setBorder( getBorder() );
+
+			popup.removePopupMenuListener( this );
+			popup.removeMouseWheelListener( this );
+			popup.removeMenuKeyListener( this );
+		}
+
+		@Override public void popupMenuWillBecomeVisible( PopupMenuEvent e ) {}
+		@Override public void popupMenuCanceled( PopupMenuEvent e ) {}
+
+		//---- interface MouseWheelListener ----
+
+		/**
+		 * Scroll when user rotates mouse wheel.
+		 */
+		@Override
+		public void mouseWheelMoved( MouseWheelEvent e ) {
+			// convert mouse location before scrolling
+			Point mouseLocation = SwingUtilities.convertPoint( (Component) e.getSource(), e.getPoint(), this );
+
+			// scroll
+			scroll( e.getUnitsToScroll() );
+
+			// select menu item at mouse location
+			Component c = SwingUtilities.getDeepestComponentAt( this, mouseLocation.x, mouseLocation.y );
+			if( c instanceof JMenuItem ) {
+				ButtonUI ui = ((JMenuItem)c).getUI();
+				if( ui instanceof BasicMenuItemUI )
+					MenuSelectionManager.defaultManager().setSelectedPath( ((BasicMenuItemUI)ui).getPath() );
+			}
+
+			// this avoids that the popup is closed when running on Java 8
+			// https://bugs.openjdk.java.net/browse/JDK-8075063
+			e.consume();
+		}
+
+		//---- interface MenuKeyListener ----
+
+		/**
+		 * Scroll when user presses Up or Down keys.
+		 */
+		@Override
+		public void menuKeyPressed( MenuKeyEvent e ) {
+			// use invokeLater() because menu selection is not yet updated because
+			// this listener is invoked before another listener that updates the menu selection
+			EventQueue.invokeLater( () -> {
+				if( !isDisplayable() )
+					return;
+
+				MenuElement[] path = MenuSelectionManager.defaultManager().getSelectedPath();
+				if( path.length == 0 )
+					return;
+
+				// scroll selected menu item to visible area
+				Component c = path[path.length - 1].getComponent();
+				JViewport viewport = scrollPane.getViewport();
+				Point pt = SwingUtilities.convertPoint( c, 0, 0, viewport );
+				viewport.scrollRectToVisible( new Rectangle( pt, c.getSize() ) );
+
+				// update arrow buttons
+				boolean upVisible = scrollUpButton.isVisible();
+				updateArrowButtons();
+				if( !upVisible && scrollUpButton.isVisible() ) {
+					// if "up" button becomes visible, make sure that bottom menu item stays visible
+					Point viewPosition = viewport.getViewPosition();
+					int newY = viewPosition.y + scrollUpButton.getPreferredSize().height;
+					viewport.setViewPosition( new Point( viewPosition.x, newY ) );
+				}
+			} );
+		}
+
+		@Override public void menuKeyTyped( MenuKeyEvent e ) {}
+		@Override public void menuKeyReleased( MenuKeyEvent e ) {}
+
+		//---- class ArrowButton ----------------------------------------------
+
+		private class ArrowButton
+			extends FlatArrowButton
+			implements MouseListener, ActionListener
+		{
+			private Timer timer;
+
+			ArrowButton( int direction ) {
+				super( direction, arrowType, scrollArrowColor, null, null, hoverScrollArrowBackground, null, null );
+
+				addMouseListener( this );
+			}
+
+			@Override
+			public void paint( Graphics g ) {
+				// always fill background to paint over border on HiDPI screens
+				g.setColor( popup.getBackground() );
+				g.fillRect( 0, 0, getWidth(), getHeight() );
+
+				super.paint( g );
+			}
+
+			//---- interface MouseListener ----
+
+			@Override public void mouseClicked( MouseEvent e ) {}
+			@Override public void mousePressed( MouseEvent e ) {}
+			@Override public void mouseReleased( MouseEvent e ) {}
+
+			@Override
+			public void mouseEntered( MouseEvent e ) {
+				if( timer == null )
+					timer = new Timer( 50, this );
+				timer.start();
+			}
+
+			@Override
+			public void mouseExited( MouseEvent e ) {
+				if( timer != null )
+					timer.stop();
+			}
+
+			//---- interface ActionListener ----
+
+			@Override
+			public void actionPerformed( ActionEvent e ) {
+				if( timer != null && !isDisplayable() ) {
+					timer.stop();
+					return;
+				}
+
+				scroll( direction == SwingConstants.NORTH ? -1 : 1 );
+			}
+		}
+	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatProgressBarUI.java

@@ -25,13 +25,17 @@ import java.awt.Insets;
 import java.awt.geom.Area;
 import java.awt.geom.RoundRectangle2D;
 import java.beans.PropertyChangeListener;
+import java.util.Map;
 import javax.swing.JComponent;
 import javax.swing.JProgressBar;
 import javax.swing.LookAndFeel;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicProgressBarUI;
+import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableUI;
 import com.formdev.flatlaf.util.HiDPIUtils;
+import com.formdev.flatlaf.util.LoggingFacade;
 import com.formdev.flatlaf.util.UIScale;
 
 /**
@@ -58,17 +62,30 @@ import com.formdev.flatlaf.util.UIScale;
  */
 public class FlatProgressBarUI
 	extends BasicProgressBarUI
+	implements StyleableUI
 {
-	protected int arc;
-	protected Dimension horizontalSize;
-	protected Dimension verticalSize;
+	@Styleable protected int arc;
+	@Styleable protected Dimension horizontalSize;
+	@Styleable protected Dimension verticalSize;
+
+	// only used via styling (not in UI defaults, but has likewise client properties)
+	/** @since 2 */ @Styleable protected boolean largeHeight;
+	/** @since 2 */ @Styleable protected boolean square;
 
 	private PropertyChangeListener propertyChangeListener;
+	private Map<String, Object> oldStyleValues;
 
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatProgressBarUI();
 	}
 
+	@Override
+	public void installUI( JComponent c ) {
+		super.installUI( c );
+
+		installStyle();
+	}
+
 	@Override
 	protected void installDefaults() {
 		super.installDefaults();
@@ -80,6 +97,13 @@ public class FlatProgressBarUI
 		verticalSize = UIManager.getDimension( "ProgressBar.verticalSize" );
 	}
 
+	@Override
+	protected void uninstallDefaults() {
+		super.uninstallDefaults();
+
+		oldStyleValues = null;
+	}
+
 	@Override
 	protected void installListeners() {
 		super.installListeners();
@@ -91,6 +115,13 @@ public class FlatProgressBarUI
 					progressBar.revalidate();
 					progressBar.repaint();
 					break;
+
+				case STYLE:
+				case STYLE_CLASS:
+					installStyle();
+					progressBar.revalidate();
+					progressBar.repaint();
+					break;
 			}
 		};
 		progressBar.addPropertyChangeListener( propertyChangeListener );
@@ -104,11 +135,42 @@ public class FlatProgressBarUI
 		propertyChangeListener = null;
 	}
 
+	/** @since 2 */
+	protected void installStyle() {
+		try {
+			applyStyle( FlatStylingSupport.getResolvedStyle( progressBar, "ProgressBar" ) );
+		} catch( RuntimeException ex ) {
+			LoggingFacade.INSTANCE.logSevere( null, ex );
+		}
+	}
+
+	/** @since 2 */
+	protected void applyStyle( Object style ) {
+		oldStyleValues = FlatStylingSupport.parseAndApply( oldStyleValues, style, this::applyStyleProperty );
+	}
+
+	/** @since 2 */
+	protected Object applyStyleProperty( String key, Object value ) {
+		return FlatStylingSupport.applyToAnnotatedObjectOrComponent( this, progressBar, key, value );
+	}
+
+	/** @since 2 */
+	@Override
+	public Map<String, Class<?>> getStyleableInfos( JComponent c ) {
+		return FlatStylingSupport.getAnnotatedStyleableInfos( this );
+	}
+
+	/** @since 2.5 */
+	@Override
+	public Object getStyleableValue( JComponent c, String key ) {
+		return FlatStylingSupport.getAnnotatedStyleableValue( this, key );
+	}
+
 	@Override
 	public Dimension getPreferredSize( JComponent c ) {
 		Dimension size = super.getPreferredSize( c );
 
-		if( progressBar.isStringPainted() || clientPropertyBoolean( c, PROGRESS_BAR_LARGE_HEIGHT, false ) ) {
+		if( progressBar.isStringPainted() || clientPropertyBoolean( c, PROGRESS_BAR_LARGE_HEIGHT, largeHeight ) ) {
 			// recalculate progress height/width to make it smaller
 			Insets insets = progressBar.getInsets();
 			FontMetrics fm = progressBar.getFontMetrics( progressBar.getFont() );
@@ -151,7 +213,7 @@ public class FlatProgressBarUI
 			return;
 
 		boolean horizontal = (progressBar.getOrientation() == JProgressBar.HORIZONTAL);
-		int arc = clientPropertyBoolean( c, PROGRESS_BAR_SQUARE, false )
+		int arc = clientPropertyBoolean( c, PROGRESS_BAR_SQUARE, square )
 			? 0
 			: Math.min( UIScale.scale( this.arc ), horizontal ? height : width );
 

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatRadioButtonMenuItemUI.java

@@ -18,11 +18,19 @@ package com.formdev.flatlaf.ui;
 
 import java.awt.Dimension;
 import java.awt.Graphics;
+import java.beans.PropertyChangeListener;
+import java.lang.invoke.MethodHandles;
+import java.util.Map;
 import javax.swing.Icon;
 import javax.swing.JComponent;
 import javax.swing.LookAndFeel;
 import javax.swing.plaf.ComponentUI;
+import javax.swing.plaf.basic.BasicMenuItemUI;
 import javax.swing.plaf.basic.BasicRadioButtonMenuItemUI;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableField;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableLookupProvider;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableUI;
+import com.formdev.flatlaf.util.LoggingFacade;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JRadioButtonMenuItem}.
@@ -52,15 +60,30 @@ import javax.swing.plaf.basic.BasicRadioButtonMenuItemUI;
  *
  * @author Karl Tauber
  */
+@StyleableField( cls=BasicMenuItemUI.class, key="selectionBackground" )
+@StyleableField( cls=BasicMenuItemUI.class, key="selectionForeground" )
+@StyleableField( cls=BasicMenuItemUI.class, key="disabledForeground" )
+@StyleableField( cls=BasicMenuItemUI.class, key="acceleratorForeground" )
+@StyleableField( cls=BasicMenuItemUI.class, key="acceleratorSelectionForeground" )
+
 public class FlatRadioButtonMenuItemUI
 	extends BasicRadioButtonMenuItemUI
+	implements StyleableUI, StyleableLookupProvider
 {
 	private FlatMenuItemRenderer renderer;
+	private Map<String, Object> oldStyleValues;
 
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatRadioButtonMenuItemUI();
 	}
 
+	@Override
+	public void installUI( JComponent c ) {
+		super.installUI( c );
+
+		installStyle();
+	}
+
 	@Override
 	protected void installDefaults() {
 		super.installDefaults();
@@ -74,13 +97,59 @@ public class FlatRadioButtonMenuItemUI
 	protected void uninstallDefaults() {
 		super.uninstallDefaults();
 
+		FlatMenuItemRenderer.clearClientProperties( menuItem.getParent() );
 		renderer = null;
+		oldStyleValues = null;
 	}
 
 	protected FlatMenuItemRenderer createRenderer() {
 		return new FlatMenuItemRenderer( menuItem, checkIcon, arrowIcon, acceleratorFont, acceleratorDelimiter );
 	}
 
+	@Override
+	protected PropertyChangeListener createPropertyChangeListener( JComponent c ) {
+		return FlatStylingSupport.createPropertyChangeListener( c, this::installStyle, super.createPropertyChangeListener( c ) );
+	}
+
+	/** @since 2 */
+	protected void installStyle() {
+		try {
+			applyStyle( FlatStylingSupport.getResolvedStyle( menuItem, "RadioButtonMenuItem" ) );
+		} catch( RuntimeException ex ) {
+			LoggingFacade.INSTANCE.logSevere( null, ex );
+		}
+	}
+
+	/** @since 2 */
+	protected void applyStyle( Object style ) {
+		oldStyleValues = FlatStylingSupport.parseAndApply( oldStyleValues, style, this::applyStyleProperty );
+	}
+
+	/** @since 2 */
+	protected Object applyStyleProperty( String key, Object value ) {
+		return FlatMenuItemUI.applyStyleProperty( menuItem, this, renderer, key, value );
+	}
+
+	/** @since 2 */
+	@Override
+	public Map<String, Class<?>> getStyleableInfos( JComponent c ) {
+		return FlatMenuItemUI.getStyleableInfos( this, renderer );
+	}
+
+	/** @since 2.5 */
+	@Override
+	public Object getStyleableValue( JComponent c, String key ) {
+		return FlatMenuItemUI.getStyleableValue( this, renderer, key );
+	}
+
+	/** @since 2.5 */
+	@Override
+	public MethodHandles.Lookup getLookupForStyling() {
+		// MethodHandles.lookup() is caller sensitive and must be invoked in this class,
+		// otherwise it is not possible to access protected fields in JRE superclass
+		return MethodHandles.lookup();
+	}
+
 	@Override
 	protected Dimension getPreferredMenuItemSize( JComponent c, Icon checkIcon, Icon arrowIcon, int defaultTextIconGap ) {
 		return renderer.getPreferredMenuItemSize();

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatRadioButtonUI.java

@@ -18,17 +18,34 @@ package com.formdev.flatlaf.ui;
 
 import static com.formdev.flatlaf.util.UIScale.scale;
 import java.awt.Color;
+import java.awt.Component;
+import java.awt.Container;
 import java.awt.Dimension;
 import java.awt.Graphics;
 import java.awt.Insets;
 import java.awt.Rectangle;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+import java.beans.PropertyChangeEvent;
+import java.beans.PropertyChangeListener;
+import java.util.Map;
+import java.util.Objects;
 import javax.swing.AbstractButton;
+import javax.swing.CellRendererPane;
+import javax.swing.Icon;
 import javax.swing.JComponent;
 import javax.swing.LookAndFeel;
+import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
+import javax.swing.plaf.basic.BasicButtonListener;
 import javax.swing.plaf.basic.BasicRadioButtonUI;
+import com.formdev.flatlaf.FlatClientProperties;
 import com.formdev.flatlaf.icons.FlatCheckBoxIcon;
+import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableUI;
+import com.formdev.flatlaf.ui.FlatStylingSupport.UnknownStyleException;
+import com.formdev.flatlaf.util.LoggingFacade;
 import com.formdev.flatlaf.util.UIScale;
 
 /**
@@ -53,16 +70,52 @@ import com.formdev.flatlaf.util.UIScale;
  */
 public class FlatRadioButtonUI
 	extends BasicRadioButtonUI
+	implements StyleableUI
 {
 	protected int iconTextGap;
-	protected Color disabledText;
+	@Styleable protected Color disabledText;
 
 	private Color defaultBackground;
 
+	private final boolean shared;
+	private boolean iconShared = true;
 	private boolean defaults_initialized = false;
+	private Map<String, Object> oldStyleValues;
 
 	public static ComponentUI createUI( JComponent c ) {
-		return FlatUIUtils.createSharedUI( FlatRadioButtonUI.class, FlatRadioButtonUI::new );
+		return FlatUIUtils.canUseSharedUI( c ) && !FlatUIUtils.needsLightAWTPeer( c )
+			? FlatUIUtils.createSharedUI( FlatRadioButtonUI.class, () -> new FlatRadioButtonUI( true ) )
+			: new FlatRadioButtonUI( false );
+	}
+
+	/** @since 2 */
+	protected FlatRadioButtonUI( boolean shared ) {
+		this.shared = shared;
+	}
+
+	@Override
+	public void installUI( JComponent c ) {
+		if( FlatUIUtils.needsLightAWTPeer( c ) )
+			FlatUIUtils.runWithLightAWTPeerUIDefaults( () -> installUIImpl( c ) );
+		else
+			installUIImpl( c );
+	}
+
+	private void installUIImpl( JComponent c ) {
+		super.installUI( c );
+
+		if( FlatUIUtils.isAWTPeer( c ) )
+			AWTPeerMouseExitedFix.install( c );
+
+		installStyle( (AbstractButton) c );
+	}
+
+	@Override
+	public void uninstallUI( JComponent c ) {
+		super.uninstallUI( c );
+
+		if( FlatUIUtils.isAWTPeer( c ) )
+			AWTPeerMouseExitedFix.uninstall( c );
 	}
 
 	@Override
@@ -77,6 +130,7 @@ public class FlatRadioButtonUI
 
 			defaultBackground = UIManager.getColor( prefix + "background" );
 
+			iconShared = true;
 			defaults_initialized = true;
 		}
 
@@ -90,11 +144,98 @@ public class FlatRadioButtonUI
 	protected void uninstallDefaults( AbstractButton b ) {
 		super.uninstallDefaults( b );
 
+		oldStyleValues = null;
+
 		MigLayoutVisualPadding.uninstall( b );
 		defaults_initialized = false;
 	}
 
-	private static Insets tempInsets = new Insets( 0, 0, 0, 0 );
+	@Override
+	protected BasicButtonListener createButtonListener( AbstractButton b ) {
+		return new FlatRadioButtonListener( b );
+	}
+
+	/** @since 2 */
+	protected void propertyChange( AbstractButton b, PropertyChangeEvent e ) {
+		switch( e.getPropertyName() ) {
+			case FlatClientProperties.STYLE:
+			case FlatClientProperties.STYLE_CLASS:
+				if( shared && FlatStylingSupport.hasStyleProperty( b ) ) {
+					// unshare component UI if necessary
+					// updateUI() invokes installStyle() from installUI()
+					b.updateUI();
+				} else
+					installStyle( b );
+				b.revalidate();
+				b.repaint();
+				break;
+		}
+	}
+
+	/** @since 2 */
+	protected void installStyle( AbstractButton b ) {
+		try {
+			applyStyle( b, FlatStylingSupport.getResolvedStyle( b, getStyleType() ) );
+		} catch( RuntimeException ex ) {
+			LoggingFacade.INSTANCE.logSevere( null, ex );
+		}
+	}
+
+	/** @since 2 */
+	String getStyleType() {
+		return "RadioButton";
+	}
+
+	/** @since 2 */
+	protected void applyStyle( AbstractButton b, Object style ) {
+		oldStyleValues = FlatStylingSupport.parseAndApply( oldStyleValues, style,
+			(key, value) -> applyStyleProperty( b, key, value ) );
+	}
+
+	/** @since 2 */
+	protected Object applyStyleProperty( AbstractButton b, String key, Object value ) {
+		// style icon
+		if( key.startsWith( "icon." ) ) {
+			if( !(icon instanceof FlatCheckBoxIcon) )
+				return new UnknownStyleException( key );
+
+			if( iconShared ) {
+				icon = FlatStylingSupport.cloneIcon( icon );
+				iconShared = false;
+			}
+
+			key = key.substring( "icon.".length() );
+			return ((FlatCheckBoxIcon)icon).applyStyleProperty( key, value );
+		}
+
+		return FlatStylingSupport.applyToAnnotatedObjectOrComponent( this, b, key, value );
+	}
+
+	/** @since 2 */
+	@Override
+	public Map<String, Class<?>> getStyleableInfos( JComponent c ) {
+		Map<String, Class<?>> infos = FlatStylingSupport.getAnnotatedStyleableInfos( this );
+		if( icon instanceof FlatCheckBoxIcon ) {
+			for( Map.Entry<String, Class<?>> e : ((FlatCheckBoxIcon)icon).getStyleableInfos().entrySet() )
+				infos.put( "icon.".concat( e.getKey() ), e.getValue() );
+		}
+		return infos;
+	}
+
+	/** @since 2.5 */
+	@Override
+	public Object getStyleableValue( JComponent c, String key ) {
+		// style icon
+		if( key.startsWith( "icon." ) ) {
+			return (icon instanceof FlatCheckBoxIcon)
+				? ((FlatCheckBoxIcon)icon).getStyleableValue( key.substring( "icon.".length() ) )
+				: null;
+		}
+
+		return FlatStylingSupport.getAnnotatedStyleableValue( this, key );
+	}
+
+	private static final Insets tempInsets = new Insets( 0, 0, 0, 0 );
 
 	@Override
 	public Dimension getPreferredSize( JComponent c ) {
@@ -107,7 +248,7 @@ public class FlatRadioButtonUI
 		if( focusWidth > 0 ) {
 			// Increase preferred width and height if insets were explicitly reduced (e.g. with
 			// an EmptyBorder) and icon has a focus width, which is not included in icon size.
-			// Otherwise the component may be too small and outer focus border may be cut off.
+			// Otherwise, the component may be too small and outer focus border may be cut off.
 			Insets insets = c.getInsets( tempInsets );
 			size.width += Math.max( focusWidth - insets.left, 0 ) + Math.max( focusWidth - insets.right, 0 );
 			size.height += Math.max( focusWidth - insets.top, 0 ) + Math.max( focusWidth - insets.bottom, 0 );
@@ -120,10 +261,11 @@ public class FlatRadioButtonUI
 	public void paint( Graphics g, JComponent c ) {
 		// fill background even if not opaque if
 		// - contentAreaFilled is true and
-		// - if background was explicitly set to a non-UIResource color
+		// - if background color is different to default background color
+		// (this paints selection if using the component as cell renderer)
 		if( !c.isOpaque() &&
 			((AbstractButton)c).isContentAreaFilled() &&
-			!defaultBackground.equals( c.getBackground() ) )
+			!Objects.equals( c.getBackground(), getDefaultBackground( c ) ) )
 		{
 			g.setColor( c.getBackground() );
 			g.fillRect( 0, 0, c.getWidth(), c.getHeight() );
@@ -160,10 +302,111 @@ public class FlatRadioButtonUI
 		FlatButtonUI.paintText( g, b, textRect, text, b.isEnabled() ? b.getForeground() : disabledText );
 	}
 
+	/**
+	 * Returns the default background color of the component.
+	 * If the component is used as cell renderer (e.g. in JTable),
+	 * then the background color of the renderer container is returned.
+	 */
+	private Color getDefaultBackground( JComponent c ) {
+		Container parent = c.getParent();
+		return (parent instanceof CellRendererPane && parent.getParent() != null)
+			? parent.getParent().getBackground()
+			: defaultBackground;
+	}
+
 	private int getIconFocusWidth( JComponent c ) {
 		AbstractButton b = (AbstractButton) c;
-		return (b.getIcon() == null && getDefaultIcon() instanceof FlatCheckBoxIcon)
-			? UIScale.scale( ((FlatCheckBoxIcon)getDefaultIcon()).focusWidth )
+		Icon icon = b.getIcon();
+		if( icon == null )
+			icon = getDefaultIcon();
+
+		return (icon instanceof FlatCheckBoxIcon)
+			? Math.round( UIScale.scale( ((FlatCheckBoxIcon)icon).getFocusWidth() ) )
 			: 0;
 	}
+
+	//---- class FlatRadioButtonListener --------------------------------------
+
+	/** @since 2 */
+	protected class FlatRadioButtonListener
+		extends BasicButtonListener
+	{
+		private final AbstractButton b;
+
+		protected FlatRadioButtonListener( AbstractButton b ) {
+			super( b );
+			this.b = b;
+		}
+
+		@Override
+		public void propertyChange( PropertyChangeEvent e ) {
+			super.propertyChange( e );
+			FlatRadioButtonUI.this.propertyChange( b, e );
+		}
+	}
+
+	//---- class AWTPeerMouseExitedFix ----------------------------------------
+
+	/**
+	 * Hack for missing mouse-exited event for java.awt.Checkbox on macOS (to fix hover effect).
+	 *
+	 * On macOS, AWT components internally use Swing components.
+	 * This is implemented in class sun.lwawt.LWCheckboxPeer, which uses
+	 * a container component CheckboxDelegate that has a JCheckBox and a JRadioButton
+	 * as children. Only one of them is visible.
+	 *
+	 * The reason that mouse-exited event is not sent to the JCheckBox or JRadioButton
+	 * is that sun.lwawt.LWComponentPeer.createDelegateEvent() uses
+	 * SwingUtilities.getDeepestComponentAt() to find the event target,
+	 * which finds the container component CheckboxDelegate,
+	 * which receives the mouse-exited event.
+	 *
+	 * This class adds listeners and forwards the mouse-exited event
+	 * from CheckboxDelegate to JCheckBox or JRadioButton.
+	 */
+	private static class AWTPeerMouseExitedFix
+		extends MouseAdapter
+		implements PropertyChangeListener
+	{
+		private final JComponent button;
+
+		static void install( JComponent button ) {
+			AWTPeerMouseExitedFix l = new AWTPeerMouseExitedFix( button );
+			button.addPropertyChangeListener( "ancestor", l );
+			Container parent = button.getParent();
+			if( parent != null )
+				parent.addMouseListener( l );
+		}
+
+		static void uninstall( JComponent button ) {
+			for( PropertyChangeListener l : button.getPropertyChangeListeners( "ancestor" ) ) {
+				if( l instanceof AWTPeerMouseExitedFix ) {
+					button.removePropertyChangeListener( "ancestor", l );
+					Container parent = button.getParent();
+					if( parent != null )
+						parent.removeMouseListener( (AWTPeerMouseExitedFix) l );
+					break;
+				}
+			}
+		}
+
+		AWTPeerMouseExitedFix( JComponent button ) {
+			this.button = button;
+		}
+
+		@Override
+		public void propertyChange( PropertyChangeEvent e ) {
+			if( e.getOldValue() instanceof Component )
+				((Component)e.getOldValue()).removeMouseListener( this );
+			if( e.getNewValue() instanceof Component ) {
+				((Component)e.getNewValue()).removeMouseListener( this ); // avoid duplicate listeners
+				((Component)e.getNewValue()).addMouseListener( this );
+			}
+		}
+
+		@Override
+		public void mouseExited( MouseEvent e ) {
+			button.dispatchEvent( SwingUtilities.convertMouseEvent( e.getComponent(), e, button ) );
+		}
+	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatRootPaneUI.java

@@ -27,7 +27,11 @@ import java.awt.Insets;
 import java.awt.LayoutManager;
 import java.awt.LayoutManager2;
 import java.awt.Window;
+import java.awt.event.ComponentAdapter;
+import java.awt.event.ComponentEvent;
+import java.awt.event.ComponentListener;
 import java.beans.PropertyChangeEvent;
+import java.beans.PropertyChangeListener;
 import java.util.function.Function;
 import javax.swing.JComponent;
 import javax.swing.JDialog;
@@ -36,6 +40,7 @@ import javax.swing.JLayeredPane;
 import javax.swing.JMenuBar;
 import javax.swing.JRootPane;
 import javax.swing.LookAndFeel;
+import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
 import javax.swing.border.Border;
 import javax.swing.plaf.BorderUIResource;
@@ -61,6 +66,9 @@ import com.formdev.flatlaf.util.UIScale;
  *
  * <!-- FlatWindowResizer -->
  *
+ * @uiDefault RootPane.font									Font	unused
+ * @uiDefault RootPane.background							Color
+ * @uiDefault RootPane.foreground							Color	unused
  * @uiDefault RootPane.borderDragThickness					int
  * @uiDefault RootPane.cornerDragWidth						int
  * @uiDefault RootPane.honorFrameMinimumSizeOnResize		boolean
@@ -79,6 +87,8 @@ public class FlatRootPaneUI
 
 	private Object nativeWindowBorderData;
 	private LayoutManager oldLayout;
+	private PropertyChangeListener ancestorListener;
+	private ComponentListener componentListener;
 
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatRootPaneUI();
@@ -95,7 +105,7 @@ public class FlatRootPaneUI
 		else
 			installBorder();
 
-		nativeWindowBorderData = FlatNativeWindowBorder.install( rootPane );
+		installNativeWindowBorder();
 	}
 
 	protected void installBorder() {
@@ -110,8 +120,7 @@ public class FlatRootPaneUI
 	public void uninstallUI( JComponent c ) {
 		super.uninstallUI( c );
 
-		FlatNativeWindowBorder.uninstall( rootPane, nativeWindowBorderData );
-
+		uninstallNativeWindowBorder();
 		uninstallClientDecorations();
 		rootPane = null;
 	}
@@ -120,8 +129,23 @@ public class FlatRootPaneUI
 	protected void installDefaults( JRootPane c ) {
 		super.installDefaults( c );
 
+		// Give the root pane useful background, foreground and font.
+		// Background is used for title bar and menu bar if native window decorations
+		// and unified background are enabled.
+		// Foreground and font are usually not used, but set for completeness.
+		// Not using LookAndFeel.installColorsAndFont() here because it will not work
+		// because the properties are null by default but inherit non-null values from parent.
+		if( !c.isBackgroundSet() || c.getBackground() instanceof UIResource )
+			c.setBackground( UIManager.getColor( "RootPane.background" ) );
+		if( !c.isForegroundSet() || c.getForeground() instanceof UIResource )
+			c.setForeground( UIManager.getColor( "RootPane.foreground" ) );
+		if( !c.isFontSet() || c.getFont() instanceof UIResource )
+			c.setFont( UIManager.getFont( "RootPane.font" ) );
+
 		// Update background color of JFrame or JDialog parent to avoid bad border
 		// on HiDPI screens when switching from light to dark Laf.
+		// Window background color is also used in native window decorations
+		// to fill background when window is initially shown or when resizing window.
 		// The background of JFrame is initialized in JFrame.frameInit() and
 		// the background of JDialog in JDialog.dialogInit(),
 		// but it was not updated when switching Laf.
@@ -137,6 +161,96 @@ public class FlatRootPaneUI
 			c.putClientProperty( "jetbrains.awt.windowDarkAppearance", FlatLaf.isLafDark() );
 	}
 
+	@Override
+	protected void uninstallDefaults( JRootPane c ) {
+		super.uninstallDefaults( c );
+
+		// uninstall background, foreground and font because not all Lafs set them
+		if( c.isBackgroundSet() && c.getBackground() instanceof UIResource )
+			c.setBackground( null );
+		if( c.isForegroundSet() && c.getForeground() instanceof UIResource )
+			c.setForeground( null );
+		if( c.isFontSet() && c.getFont() instanceof UIResource )
+			c.setFont( null );
+	}
+
+	@Override
+	protected void installListeners( JRootPane root ) {
+		super.installListeners( root );
+
+		if( SystemInfo.isJava_9_orLater ) {
+			// On HiDPI screens, where scaling is used, there may be white lines on the
+			// bottom and on the right side of the window when it is initially shown.
+			// This is very disturbing in dark themes, but hard to notice in light themes.
+			// Seems to be a rounding issue when Swing adds dirty region of window
+			// using RepaintManager.nativeAddDirtyRegion().
+			//
+			// Note: Not using a HierarchyListener here, which would be much easier,
+			// because this causes problems with mouse clicks in heavy-weight popups.
+			// Instead, add a listener to the root pane that waits until it is added
+			// to a window, then add a component listener to the window.
+			// See: https://github.com/JFormDesigner/FlatLaf/issues/371
+			ancestorListener = e -> {
+				Object oldValue = e.getOldValue();
+				Object newValue = e.getNewValue();
+				if( newValue instanceof Window ) {
+					if( componentListener == null ) {
+						componentListener = new ComponentAdapter() {
+							@Override
+							public void componentShown( ComponentEvent e ) {
+								// add whole root pane to dirty regions when window is initially shown
+								root.getParent().repaint( root.getX(), root.getY(), root.getWidth(), root.getHeight() );
+							}
+						};
+					}
+					((Window)newValue).addComponentListener( componentListener );
+				} else if( newValue == null && oldValue instanceof Window ) {
+					if( componentListener != null )
+						((Window)oldValue).removeComponentListener( componentListener );
+				}
+			};
+			root.addPropertyChangeListener( "ancestor", ancestorListener );
+		}
+	}
+
+	@Override
+	protected void uninstallListeners( JRootPane root ) {
+		super.uninstallListeners( root );
+
+		if( SystemInfo.isJava_9_orLater ) {
+			if( componentListener != null ) {
+				Window window = SwingUtilities.windowForComponent( root );
+				if( window != null )
+					window.removeComponentListener( componentListener );
+				componentListener = null;
+			}
+			root.removePropertyChangeListener( "ancestor", ancestorListener );
+			ancestorListener = null;
+		}
+	}
+
+	/** @since 1.1.2 */
+	protected void installNativeWindowBorder() {
+		nativeWindowBorderData = FlatNativeWindowBorder.install( rootPane );
+	}
+
+	/** @since 1.1.2 */
+	protected void uninstallNativeWindowBorder() {
+		FlatNativeWindowBorder.uninstall( rootPane, nativeWindowBorderData );
+		nativeWindowBorderData = null;
+	}
+
+	/** @since 1.1.2 */
+	public static void updateNativeWindowBorder( JRootPane rootPane ) {
+		RootPaneUI rui = rootPane.getUI();
+		if( !(rui instanceof FlatRootPaneUI) )
+			return;
+
+		FlatRootPaneUI ui = (FlatRootPaneUI) rui;
+		ui.uninstallNativeWindowBorder();
+		ui.installNativeWindowBorder();
+	}
+
 	protected void installClientDecorations() {
 		boolean isNativeWindowBorderSupported = FlatNativeWindowBorder.isSupported();
 
@@ -218,6 +332,10 @@ public class FlatRootPaneUI
 					installBorder();
 				break;
 
+			case FlatClientProperties.USE_WINDOW_DECORATIONS:
+				updateNativeWindowBorder( rootPane );
+				break;
+
 			case FlatClientProperties.MENU_BAR_EMBEDDED:
 				if( titlePane != null ) {
 					titlePane.menuBarChanged();
@@ -225,6 +343,17 @@ public class FlatRootPaneUI
 					rootPane.repaint();
 				}
 				break;
+
+			case FlatClientProperties.TITLE_BAR_SHOW_ICON:
+				if( titlePane != null )
+					titlePane.updateIcon();
+				break;
+
+			case FlatClientProperties.TITLE_BAR_BACKGROUND:
+			case FlatClientProperties.TITLE_BAR_FOREGROUND:
+				if( titlePane != null )
+					titlePane.titleBarColorsChanged();
+				break;
 		}
 	}
 
@@ -235,6 +364,12 @@ public class FlatRootPaneUI
 			((FlatRootPaneUI)ui).titlePane.isMenuBarEmbedded();
 	}
 
+	/** @since 2.4 */
+	protected static FlatTitlePane getTitlePane( JRootPane rootPane ) {
+		RootPaneUI ui = rootPane.getUI();
+		return ui instanceof FlatRootPaneUI ? ((FlatRootPaneUI)ui).titlePane : null;
+	}
+
 	//---- class FlatRootLayout -----------------------------------------------
 
 	protected class FlatRootLayout
@@ -269,7 +404,7 @@ public class FlatRootPaneUI
 				? getSizeFunc.apply( rootPane.getContentPane() )
 				: rootPane.getSize();
 
-			int width = Math.max( titlePaneSize.width, contentSize.width );
+			int width = contentSize.width; // title pane width is not considered here
 			int height = titlePaneSize.height + contentSize.height;
 			if( titlePane == null || !titlePane.isMenuBarEmbedded() ) {
 				JMenuBar menuBar = rootPane.getJMenuBar();
@@ -381,7 +516,7 @@ public class FlatRootPaneUI
 				return;
 
 			Container parent = c.getParent();
-			boolean active = parent instanceof Window ? ((Window)parent).isActive() : false;
+			boolean active = parent instanceof Window && ((Window)parent).isActive();
 
 			g.setColor( FlatUIUtils.deriveColor( active ? activeBorderColor : inactiveBorderColor, baseBorderColor ) );
 			HiDPIUtils.paintAtScale1x( (Graphics2D) g, x, y, width, height, this::paintImpl );
@@ -393,9 +528,7 @@ public class FlatRootPaneUI
 
 		protected boolean isWindowMaximized( Component c ) {
 			Container parent = c.getParent();
-			return parent instanceof Frame
-				? (((Frame)parent).getExtendedState() & Frame.MAXIMIZED_BOTH) != 0
-				: false;
+			return parent instanceof Frame && (((Frame)parent).getExtendedState() & Frame.MAXIMIZED_BOTH) != 0;
 		}
 	}
 
@@ -431,7 +564,9 @@ public class FlatRootPaneUI
 				(parent instanceof JFrame &&
 				 (((JFrame)parent).getJMenuBar() == null ||
 				  !((JFrame)parent).getJMenuBar().isVisible())) ||
-				parent instanceof JDialog;
+				(parent instanceof JDialog &&
+				 (((JDialog)parent).getJMenuBar() == null ||
+				  !((JDialog)parent).getJMenuBar().isVisible()));
 		}
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatRoundBorder.java

@@ -18,6 +18,7 @@ package com.formdev.flatlaf.ui;
 
 import java.awt.Component;
 import javax.swing.UIManager;
+import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
 
 /**
  * Border for various components (e.g. {@link javax.swing.JComboBox}).
@@ -29,7 +30,10 @@ import javax.swing.UIManager;
 public class FlatRoundBorder
 	extends FlatBorder
 {
-	protected final int arc = UIManager.getInt( "Component.arc" );
+	@Styleable protected int arc = UIManager.getInt( "Component.arc" );
+
+	// only used via styling (not in UI defaults, but has likewise client properties)
+	/** @since 2 */ @Styleable protected Boolean roundRect;
 
 	@Override
 	protected int getArc( Component c ) {
@@ -37,6 +41,8 @@ public class FlatRoundBorder
 			return 0;
 
 		Boolean roundRect = FlatUIUtils.isRoundRect( c );
+		if( roundRect == null )
+			roundRect = this.roundRect;
 		return roundRect != null ? (roundRect ? Short.MAX_VALUE : 0) : arc;
 	}
 }

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatScrollBarUI.java

@@ -17,6 +17,7 @@
 package com.formdev.flatlaf.ui;
 
 import java.awt.Color;
+import java.awt.Container;
 import java.awt.Dimension;
 import java.awt.Graphics;
 import java.awt.Insets;
@@ -24,6 +25,8 @@ import java.awt.Rectangle;
 import java.awt.event.MouseAdapter;
 import java.awt.event.MouseEvent;
 import java.beans.PropertyChangeListener;
+import java.lang.invoke.MethodHandles;
+import java.util.Map;
 import java.util.Objects;
 import javax.swing.InputMap;
 import javax.swing.JButton;
@@ -35,6 +38,13 @@ import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicScrollBarUI;
 import com.formdev.flatlaf.FlatClientProperties;
+import com.formdev.flatlaf.FlatLaf;
+import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableField;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableLookupProvider;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableUI;
+import com.formdev.flatlaf.util.LoggingFacade;
+import com.formdev.flatlaf.util.SystemInfo;
 import com.formdev.flatlaf.util.UIScale;
 
 /**
@@ -43,7 +53,7 @@ import com.formdev.flatlaf.util.UIScale;
  * <!-- BasicScrollBarUI -->
  *
  * @uiDefault ScrollBar.background			Color
- * @uiDefault ScrollBar.foreground			Color
+ * @uiDefault ScrollBar.foreground			Color	unused
  * @uiDefault ScrollBar.track				Color
  * @uiDefault ScrollBar.thumb				Color
  * @uiDefault ScrollBar.width				int
@@ -53,6 +63,7 @@ import com.formdev.flatlaf.util.UIScale;
  *
  * <!-- FlatScrollBarUI -->
  *
+ * @uiDefault ScrollBar.minimumButtonSize			Dimension
  * @uiDefault ScrollBar.trackInsets					Insets
  * @uiDefault ScrollBar.thumbInsets					Insets
  * @uiDefault ScrollBar.trackArc					int
@@ -72,35 +83,56 @@ import com.formdev.flatlaf.util.UIScale;
  *
  * @author Karl Tauber
  */
+@StyleableField( cls=BasicScrollBarUI.class, key="track", fieldName="trackColor" )
+@StyleableField( cls=BasicScrollBarUI.class, key="thumb", fieldName="thumbColor" )
+@StyleableField( cls=BasicScrollBarUI.class, key="width", fieldName="scrollBarWidth" )
+@StyleableField( cls=BasicScrollBarUI.class, key="minimumThumbSize" )
+@StyleableField( cls=BasicScrollBarUI.class, key="maximumThumbSize" )
+
 public class FlatScrollBarUI
 	extends BasicScrollBarUI
+	implements StyleableUI, StyleableLookupProvider
 {
-	protected Insets trackInsets;
-	protected Insets thumbInsets;
-	protected int trackArc;
-	protected int thumbArc;
-	protected Color hoverTrackColor;
-	protected Color hoverThumbColor;
-	protected boolean hoverThumbWithTrack;
-	protected Color pressedTrackColor;
-	protected Color pressedThumbColor;
-	protected boolean pressedThumbWithTrack;
+	// overrides BasicScrollBarUI.supportsAbsolutePositioning (which is private)
+	@Styleable protected boolean allowsAbsolutePositioning;
 
-	protected boolean showButtons;
-	protected String arrowType;
-	protected Color buttonArrowColor;
-	protected Color buttonDisabledArrowColor;
-	protected Color hoverButtonBackground;
-	protected Color pressedButtonBackground;
+	/** @since 2.1 */ @Styleable protected Dimension minimumButtonSize;
+	@Styleable protected Insets trackInsets;
+	@Styleable protected Insets thumbInsets;
+	@Styleable protected int trackArc;
+	@Styleable protected int thumbArc;
+	@Styleable protected Color hoverTrackColor;
+	@Styleable protected Color hoverThumbColor;
+	@Styleable protected boolean hoverThumbWithTrack;
+	@Styleable protected Color pressedTrackColor;
+	@Styleable protected Color pressedThumbColor;
+	@Styleable protected boolean pressedThumbWithTrack;
+
+	@Styleable protected boolean showButtons;
+	@Styleable protected String arrowType;
+	@Styleable protected Color buttonArrowColor;
+	@Styleable protected Color buttonDisabledArrowColor;
+	@Styleable protected Color hoverButtonBackground;
+	@Styleable protected Color pressedButtonBackground;
 
 	private MouseAdapter hoverListener;
 	protected boolean hoverTrack;
 	protected boolean hoverThumb;
 
+	private Map<String, Object> oldStyleValues;
+	private boolean isAWTPeer;
+
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatScrollBarUI();
 	}
 
+	@Override
+	public void installUI( JComponent c ) {
+		super.installUI( c );
+
+		installStyle();
+	}
+
 	@Override
 	protected void installListeners() {
 		super.installListeners();
@@ -123,6 +155,9 @@ public class FlatScrollBarUI
 	protected void installDefaults() {
 		super.installDefaults();
 
+		allowsAbsolutePositioning = super.getSupportsAbsolutePositioning();
+
+		minimumButtonSize = UIManager.getDimension( "ScrollBar.minimumButtonSize" );
 		trackInsets = UIManager.getInsets( "ScrollBar.trackInsets" );
 		thumbInsets = UIManager.getInsets( "ScrollBar.thumbInsets" );
 		trackArc = UIManager.getInt( "ScrollBar.trackArc" );
@@ -152,6 +187,7 @@ public class FlatScrollBarUI
 	protected void uninstallDefaults() {
 		super.uninstallDefaults();
 
+		minimumButtonSize = null;
 		trackInsets = null;
 		thumbInsets = null;
 		hoverTrackColor = null;
@@ -163,6 +199,8 @@ public class FlatScrollBarUI
 		buttonDisabledArrowColor = null;
 		hoverButtonBackground = null;
 		pressedButtonBackground = null;
+
+		oldStyleValues = null;
 	}
 
 	@Override
@@ -177,6 +215,13 @@ public class FlatScrollBarUI
 					scrollbar.repaint();
 					break;
 
+				case FlatClientProperties.STYLE:
+				case FlatClientProperties.STYLE_CLASS:
+					installStyle();
+					scrollbar.revalidate();
+					scrollbar.repaint();
+					break;
+
 				case "componentOrientation":
 					// this is missing in BasicScrollBarUI.Handler.propertyChange()
 					InputMap inputMap = (InputMap) UIManager.get( "ScrollBar.ancestorInputMap" );
@@ -189,10 +234,85 @@ public class FlatScrollBarUI
 					}
 					SwingUtilities.replaceUIInputMap( scrollbar, JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, inputMap );
 					break;
+
+				case "ancestor":
+					// check whether scroll bar is used as AWT peer on macOS
+					if( SystemInfo.isMacOS ) {
+						Container p = scrollbar.getParent();
+						for( int i = 0; i < 2 && p != null; i++, p = p.getParent() ) {
+							if( FlatUIUtils.isAWTPeer( p ) ) {
+								// Used to disable hover, which does not work correctly
+								// because scroll bars do not receive mouse exited event.
+								// The scroll pane, including its scroll bars, is not part
+								// of the component hierarchy and does not receive mouse events
+								// directly. Instead LWComponentPeer receives mouse events
+								// and delegates them to peers, but entered/exited events
+								// are sent only for the whole scroll pane.
+								// Exited event is only sent when mouse leaves scroll pane.
+								// If mouse enters/exits scroll bar, no entered/exited events are sent.
+								isAWTPeer = true;
+
+								// if dark theme is active, reinstall using light theme
+								if( FlatLaf.isLafDark() ) {
+									FlatUIUtils.runWithLightAWTPeerUIDefaults( () -> {
+										JScrollBar scrollbar = this.scrollbar;
+										uninstallUI( scrollbar );
+										installUI( scrollbar );
+									} );
+								}
+								break;
+							}
+						}
+					}
+					break;
 			}
 		};
 	}
 
+	/** @since 2 */
+	protected void installStyle() {
+		try {
+			applyStyle( FlatStylingSupport.getResolvedStyle( scrollbar, "ScrollBar" ) );
+		} catch( RuntimeException ex ) {
+			LoggingFacade.INSTANCE.logSevere( null, ex );
+		}
+	}
+
+	/** @since 2 */
+	protected void applyStyle( Object style ) {
+		oldStyleValues = FlatStylingSupport.parseAndApply( oldStyleValues, style, this::applyStyleProperty );
+
+		if( incrButton instanceof FlatScrollBarButton )
+			((FlatScrollBarButton)incrButton).updateStyle();
+		if( decrButton instanceof FlatScrollBarButton )
+			((FlatScrollBarButton)decrButton).updateStyle();
+	}
+
+	/** @since 2 */
+	protected Object applyStyleProperty( String key, Object value ) {
+		return FlatStylingSupport.applyToAnnotatedObjectOrComponent( this, scrollbar, key, value );
+	}
+
+	/** @since 2 */
+	@Override
+	public Map<String, Class<?>> getStyleableInfos( JComponent c ) {
+		return FlatStylingSupport.getAnnotatedStyleableInfos( this );
+	}
+
+	/** @since 2.5 */
+	@Override
+	public Object getStyleableValue( JComponent c, String key ) {
+		return FlatStylingSupport.getAnnotatedStyleableValue( this, key );
+	}
+
+	/** @since 2.5 */
+	@Override
+	public MethodHandles.Lookup getLookupForStyling() {
+		// MethodHandles.lookup() is caller sensitive and must be invoked in this class,
+		// otherwise it is not possible to access protected fields in JRE superclass
+		return MethodHandles.lookup();
+	}
+
 	@Override
 	public Dimension getPreferredSize( JComponent c ) {
 		return UIScale.scale( super.getPreferredSize( c ) );
@@ -209,9 +329,17 @@ public class FlatScrollBarUI
 	}
 
 	protected boolean isShowButtons() {
+		// check client property on scroll bar
 		Object showButtons = scrollbar.getClientProperty( FlatClientProperties.SCROLL_BAR_SHOW_BUTTONS );
-		if( showButtons == null && scrollbar.getParent() instanceof JScrollPane )
-			showButtons = ((JScrollPane)scrollbar.getParent()).getClientProperty( FlatClientProperties.SCROLL_BAR_SHOW_BUTTONS );
+		if( showButtons == null && scrollbar.getParent() instanceof JScrollPane ) {
+			JScrollPane scrollPane = (JScrollPane) scrollbar.getParent();
+			// check client property on scroll pane
+			showButtons = scrollPane.getClientProperty( FlatClientProperties.SCROLL_BAR_SHOW_BUTTONS );
+			if( showButtons == null && scrollPane.getUI() instanceof FlatScrollPaneUI ) {
+				// check styling property on scroll pane
+				showButtons = ((FlatScrollPaneUI)scrollPane.getUI()).showButtons;
+			}
+		}
 		return (showButtons != null) ? Objects.equals( showButtons, true ) : this.showButtons;
 	}
 
@@ -224,6 +352,9 @@ public class FlatScrollBarUI
 
 	@Override
 	protected void paintTrack( Graphics g, JComponent c, Rectangle trackBounds ) {
+		if( trackBounds.isEmpty() || !scrollbar.isEnabled() )
+			return;
+
 		g.setColor( getTrackColor( c, hoverTrack, isPressed && hoverTrack && !hoverThumb ) );
 		paintTrackOrThumb( g, c, trackBounds, trackInsets, trackArc );
 	}
@@ -270,7 +401,7 @@ public class FlatScrollBarUI
 		Color trackColor = FlatUIUtils.deriveColor( this.trackColor, c.getBackground() );
 		return (pressed && pressedTrackColor != null)
 			? FlatUIUtils.deriveColor( pressedTrackColor, trackColor )
-			: ((hover && hoverTrackColor != null)
+			: ((hover && hoverTrackColor != null && !isAWTPeer)
 				? FlatUIUtils.deriveColor( hoverTrackColor, trackColor )
 				: trackColor);
 	}
@@ -280,7 +411,7 @@ public class FlatScrollBarUI
 		Color thumbColor = FlatUIUtils.deriveColor( this.thumbColor, trackColor );
 		return (pressed && pressedThumbColor != null)
 			? FlatUIUtils.deriveColor( pressedThumbColor, thumbColor )
-			: ((hover && hoverThumbColor != null)
+			: ((hover && hoverThumbColor != null && !isAWTPeer)
 				? FlatUIUtils.deriveColor( hoverThumbColor, thumbColor )
 				: thumbColor);
 	}
@@ -295,6 +426,11 @@ public class FlatScrollBarUI
 		return UIScale.scale( FlatUIUtils.addInsets( super.getMaximumThumbSize(), thumbInsets ) );
 	}
 
+	@Override
+	public boolean getSupportsAbsolutePositioning() {
+		return allowsAbsolutePositioning;
+	}
+
 	//---- class ScrollBarHoverListener ---------------------------------------
 
 	// using static field to disabling hover for other scroll bars
@@ -319,18 +455,31 @@ public class FlatScrollBarUI
 
 		@Override
 		public void mousePressed( MouseEvent e ) {
-			isPressed = true;
-			repaint();
+			if( SwingUtilities.isLeftMouseButton( e ) || isAbsolutePositioning( e ) ) {
+				isPressed = true;
+				repaint();
+
+				// update hover because BasicScrollBarUI.TrackListener.mousePressed()
+				// moves the track on middle-click (if absolute positioning is enabled)
+				if( isAbsolutePositioning( e ) )
+					update( e.getX(), e.getY() );
+			}
 		}
 
 		@Override
 		public void mouseReleased( MouseEvent e ) {
-			isPressed = false;
-			repaint();
+			if( SwingUtilities.isLeftMouseButton( e ) || isAbsolutePositioning( e ) ) {
+				isPressed = false;
+				repaint();
+			}
 
 			update( e.getX(), e.getY() );
 		}
 
+		private boolean isAbsolutePositioning( MouseEvent e ) {
+			return getSupportsAbsolutePositioning() && SwingUtilities.isMiddleMouseButton( e );
+		}
+
 		private void update( int x, int y ) {
 			boolean inTrack = getTrackBounds().contains( x, y );
 			boolean inThumb = getThumbBounds().contains( x, y );
@@ -363,11 +512,27 @@ public class FlatScrollBarUI
 			super( direction, type, foreground, disabledForeground,
 				hoverForeground, hoverBackground, pressedForeground, pressedBackground );
 
-			setArrowWidth( FlatArrowButton.DEFAULT_ARROW_WIDTH - 2 );
 			setFocusable( false );
 			setRequestFocusEnabled( false );
 		}
 
+		protected void updateStyle() {
+			updateStyle( arrowType, buttonArrowColor, buttonDisabledArrowColor,
+				null, hoverButtonBackground, null, pressedButtonBackground );
+		}
+
+		@Override
+		public int getArrowWidth() {
+			// scale arrow size depending on scroll bar width
+			// (6 is default arrow width; 10 is base scroll bar width)
+			int arrowWidth = Math.round( 6 * (scrollBarWidth / 10f) );
+
+			// compute arrow size that leaves equal space on both sides (arrow is centered)
+			arrowWidth = scrollBarWidth - (((scrollBarWidth - arrowWidth) / 2) * 2);
+
+			return arrowWidth;
+		}
+
 		@Override
 		protected Color deriveBackground( Color background ) {
 			return FlatUIUtils.deriveColor( background, scrollbar.getBackground() );
@@ -376,8 +541,9 @@ public class FlatScrollBarUI
 		@Override
 		public Dimension getPreferredSize() {
 			if( isShowButtons() ) {
-				int w = UIScale.scale( scrollBarWidth );
-				return new Dimension( w, w );
+				int w = UIScale.scale( Math.max( scrollBarWidth, (minimumButtonSize != null) ? minimumButtonSize.width : 0 ) );
+				int h = UIScale.scale( Math.max( scrollBarWidth, (minimumButtonSize != null) ? minimumButtonSize.height : 0 ) );
+				return new Dimension( w, h );
 			} else
 				return new Dimension();
 		}

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatScrollPaneUI.java

@@ -19,6 +19,7 @@ package com.formdev.flatlaf.ui;
 import java.awt.Component;
 import java.awt.Graphics;
 import java.awt.Insets;
+import java.awt.KeyboardFocusManager;
 import java.awt.Rectangle;
 import java.awt.event.ContainerEvent;
 import java.awt.event.ContainerListener;
@@ -28,21 +29,28 @@ import java.awt.event.MouseWheelEvent;
 import java.awt.event.MouseWheelListener;
 import java.beans.PropertyChangeEvent;
 import java.beans.PropertyChangeListener;
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicBoolean;
 import javax.swing.BorderFactory;
 import javax.swing.JButton;
 import javax.swing.JComponent;
 import javax.swing.JScrollBar;
 import javax.swing.JScrollPane;
 import javax.swing.JTable;
+import javax.swing.JTree;
 import javax.swing.JViewport;
 import javax.swing.LookAndFeel;
 import javax.swing.ScrollPaneConstants;
 import javax.swing.Scrollable;
 import javax.swing.SwingConstants;
+import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicScrollPaneUI;
 import com.formdev.flatlaf.FlatClientProperties;
+import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableUI;
+import com.formdev.flatlaf.util.LoggingFacade;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JScrollPane}.
@@ -63,20 +71,36 @@ import com.formdev.flatlaf.FlatClientProperties;
  */
 public class FlatScrollPaneUI
 	extends BasicScrollPaneUI
+	implements StyleableUI
 {
+	// only used via styling (not in UI defaults, but has likewise client properties)
+	/** @since 2 */ @Styleable protected Boolean showButtons;
+
 	private Handler handler;
 
+	private Map<String, Object> oldStyleValues;
+	private AtomicBoolean borderShared;
+
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatScrollPaneUI();
 	}
 
 	@Override
 	public void installUI( JComponent c ) {
+		if( FlatUIUtils.needsLightAWTPeer( c ) )
+			FlatUIUtils.runWithLightAWTPeerUIDefaults( () -> installUIImpl( c ) );
+		else
+			installUIImpl( c );
+	}
+
+	private void installUIImpl( JComponent c ) {
 		super.installUI( c );
 
 		int focusWidth = UIManager.getInt( "Component.focusWidth" );
 		LookAndFeel.installProperty( c, "opaque", focusWidth == 0 );
 
+		installStyle();
+
 		MigLayoutVisualPadding.install( scrollpane );
 	}
 
@@ -85,6 +109,9 @@ public class FlatScrollPaneUI
 		MigLayoutVisualPadding.uninstall( scrollpane );
 
 		super.uninstallUI( c );
+
+		oldStyleValues = null;
+		borderShared = null;
 	}
 
 	@Override
@@ -269,7 +296,18 @@ public class FlatScrollPaneUI
 						((JButton)corner).setBorder( BorderFactory.createEmptyBorder() );
 						((JButton)corner).setFocusable( false );
 					}
-				break;
+					break;
+
+				case FlatClientProperties.OUTLINE:
+					scrollpane.repaint();
+					break;
+
+				case FlatClientProperties.STYLE:
+				case FlatClientProperties.STYLE_CLASS:
+					installStyle();
+					scrollpane.revalidate();
+					scrollpane.repaint();
+					break;
 			}
 		};
 	}
@@ -280,6 +318,44 @@ public class FlatScrollPaneUI
 		return handler;
 	}
 
+	/** @since 2 */
+	protected void installStyle() {
+		try {
+			applyStyle( FlatStylingSupport.getResolvedStyle( scrollpane, "ScrollPane" ) );
+		} catch( RuntimeException ex ) {
+			LoggingFacade.INSTANCE.logSevere( null, ex );
+		}
+	}
+
+	/** @since 2 */
+	protected void applyStyle( Object style ) {
+		oldStyleValues = FlatStylingSupport.parseAndApply( oldStyleValues, style, this::applyStyleProperty );
+	}
+
+	/** @since 2 */
+	protected Object applyStyleProperty( String key, Object value ) {
+		if( key.equals( "focusWidth" ) ) {
+			int focusWidth = (value instanceof Integer) ? (int) value : UIManager.getInt( "Component.focusWidth" );
+			LookAndFeel.installProperty( scrollpane, "opaque", focusWidth == 0 );
+		}
+
+		if( borderShared == null )
+			borderShared = new AtomicBoolean( true );
+		return FlatStylingSupport.applyToAnnotatedObjectOrBorder( this, key, value, scrollpane, borderShared );
+	}
+
+	/** @since 2 */
+	@Override
+	public Map<String, Class<?>> getStyleableInfos( JComponent c ) {
+		return FlatStylingSupport.getAnnotatedStyleableInfos( this, scrollpane.getBorder() );
+	}
+
+	/** @since 2.5 */
+	@Override
+	public Object getStyleableValue( JComponent c, String key ) {
+		return FlatStylingSupport.getAnnotatedStyleableValue( this, scrollpane.getBorder(), key );
+	}
+
 	@Override
 	protected void updateViewport( PropertyChangeEvent e ) {
 		super.updateViewport( e );
@@ -329,6 +405,29 @@ public class FlatScrollPaneUI
 		paint( g, c );
 	}
 
+	/** @since 1.3 */
+	public static boolean isPermanentFocusOwner( JScrollPane scrollPane ) {
+		JViewport viewport = scrollPane.getViewport();
+		Component view = (viewport != null) ? viewport.getView() : null;
+		if( view == null )
+			return false;
+
+		// check whether view is focus owner
+		if( FlatUIUtils.isPermanentFocusOwner( view ) )
+			return true;
+
+		// check whether editor component in JTable or JTree is focus owner
+		if( (view instanceof JTable && ((JTable)view).isEditing()) ||
+			(view instanceof JTree && ((JTree)view).isEditing()) )
+		{
+			Component focusOwner = KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner();
+			if( focusOwner != null )
+				return SwingUtilities.isDescendingFrom( focusOwner, view );
+		}
+
+		return false;
+	}
+
 	//---- class Handler ------------------------------------------------------
 
 	/**
@@ -350,11 +449,13 @@ public class FlatScrollPaneUI
 
 		@Override
 		public void focusGained( FocusEvent e ) {
+			// necessary to update focus border
 			scrollpane.repaint();
 		}
 
 		@Override
 		public void focusLost( FocusEvent e ) {
+			// necessary to update focus border
 			scrollpane.repaint();
 		}
 	}

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatSeparatorUI.java

@@ -21,11 +21,18 @@ import java.awt.Dimension;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
 import java.awt.geom.Rectangle2D;
+import java.beans.PropertyChangeEvent;
+import java.beans.PropertyChangeListener;
+import java.util.Map;
 import javax.swing.JComponent;
 import javax.swing.JSeparator;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicSeparatorUI;
+import com.formdev.flatlaf.FlatClientProperties;
+import com.formdev.flatlaf.ui.FlatStylingSupport.Styleable;
+import com.formdev.flatlaf.ui.FlatStylingSupport.StyleableUI;
+import com.formdev.flatlaf.util.LoggingFacade;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JSeparator}.
@@ -45,15 +52,36 @@ import javax.swing.plaf.basic.BasicSeparatorUI;
  */
 public class FlatSeparatorUI
 	extends BasicSeparatorUI
+	implements StyleableUI, PropertyChangeListener
 {
-	protected int height;
-	protected int stripeWidth;
-	protected int stripeIndent;
+	@Styleable protected int height;
+	@Styleable protected int stripeWidth;
+	@Styleable protected int stripeIndent;
 
+	private final boolean shared;
 	private boolean defaults_initialized = false;
+	private Map<String, Object> oldStyleValues;
 
 	public static ComponentUI createUI( JComponent c ) {
-		return FlatUIUtils.createSharedUI( FlatSeparatorUI.class, FlatSeparatorUI::new );
+		return FlatUIUtils.canUseSharedUI( c )
+			? FlatUIUtils.createSharedUI( FlatSeparatorUI.class, () -> new FlatSeparatorUI( true ) )
+			: new FlatSeparatorUI( false );
+	}
+
+	/** @since 2 */
+	protected FlatSeparatorUI( boolean shared ) {
+		this.shared = shared;
+	}
+
+	protected String getPropertyPrefix() {
+		return "Separator";
+	}
+
+	@Override
+	public void installUI( JComponent c ) {
+		super.installUI( c );
+
+		installStyle( (JSeparator) c );
 	}
 
 	@Override
@@ -73,13 +101,81 @@ public class FlatSeparatorUI
 	@Override
 	protected void uninstallDefaults( JSeparator s ) {
 		super.uninstallDefaults( s );
+
 		defaults_initialized = false;
+		oldStyleValues = null;
 	}
 
-	protected String getPropertyPrefix() {
+	@Override
+	protected void installListeners( JSeparator s ) {
+		super.installListeners( s );
+
+		s.addPropertyChangeListener( this );
+	}
+
+	@Override
+	protected void uninstallListeners( JSeparator s ) {
+		super.uninstallListeners( s );
+
+		s.removePropertyChangeListener( this );
+	}
+
+	/** @since 2.0.1 */
+	@Override
+	public void propertyChange( PropertyChangeEvent e ) {
+		switch( e.getPropertyName() ) {
+			case FlatClientProperties.STYLE:
+			case FlatClientProperties.STYLE_CLASS:
+				JSeparator s = (JSeparator) e.getSource();
+				if( shared && FlatStylingSupport.hasStyleProperty( s ) ) {
+					// unshare component UI if necessary
+					// updateUI() invokes installStyle() from installUI()
+					s.updateUI();
+				} else
+					installStyle( s );
+				s.revalidate();
+				s.repaint();
+				break;
+		}
+	}
+
+	/** @since 2 */
+	protected void installStyle( JSeparator s ) {
+		try {
+			applyStyle( s, FlatStylingSupport.getResolvedStyle( s, getStyleType() ) );
+		} catch( RuntimeException ex ) {
+			LoggingFacade.INSTANCE.logSevere( null, ex );
+		}
+	}
+
+	/** @since 2 */
+	String getStyleType() {
 		return "Separator";
 	}
 
+	/** @since 2 */
+	protected void applyStyle( JSeparator s, Object style ) {
+		oldStyleValues = FlatStylingSupport.parseAndApply( oldStyleValues, style,
+			(key, value) -> applyStyleProperty( s, key, value ) );
+	}
+
+	/** @since 2 */
+	protected Object applyStyleProperty( JSeparator s, String key, Object value ) {
+		return FlatStylingSupport.applyToAnnotatedObjectOrComponent( this, s, key, value );
+	}
+
+	/** @since 2 */
+	@Override
+	public Map<String, Class<?>> getStyleableInfos( JComponent c ) {
+		return FlatStylingSupport.getAnnotatedStyleableInfos( this );
+	}
+
+	/** @since 2.5 */
+	@Override
+	public Object getStyleableValue( JComponent c, String key ) {
+		return FlatStylingSupport.getAnnotatedStyleableValue( this, key );
+	}
+
 	@Override
 	public void paint( Graphics g, JComponent c ) {
 		Graphics2D g2 = (Graphics2D) g.create();