release 0.46

AnimatedIcon

.github/workflows/ci.yml

@@ -0,0 +1,142 @@
+# https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-gradle
+
+name: CI
+
+on:
+  push:
+    branches:
+      - '*'
+    tags:
+      - '[0-9]*'
+  pull_request:
+    branches: 
+      - '*'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        # test against
+        # - Java 1.8 (minimum requirement)
+        # - Java 9 (first version with JPMS)
+        # - Java LTS versions (11, 17, ...)
+        # - lastest Java version(s)
+        java:
+          - 1.8
+          - 9
+          - 11  # LTS
+          - 14
+          - 15
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Setup Java ${{ matrix.java }}
+        uses: actions/setup-java@v1
+        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
+
+      - name: Build with Gradle
+        run: ./gradlew build
+
+      - name: Upload artifacts
+        uses: actions/upload-artifact@v2
+        if: matrix.java == '11'
+        with:
+          name: FlatLaf-build-artifacts
+          path: |
+            flatlaf-core/build/libs
+            flatlaf-demo/build/libs
+            flatlaf-extras/build/libs
+            flatlaf-intellij-themes/build/libs
+            flatlaf-jide-oss/build/libs
+            flatlaf-swingx/build/libs
+            !**/*-javadoc.jar
+            !**/*-sources.jar
+
+
+  snapshot:
+    runs-on: ubuntu-latest
+    needs: build
+    if: |
+      github.event_name == 'push' &&
+      github.ref == 'refs/heads/master' &&
+      github.repository == 'JFormDesigner/FlatLaf'
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Setup Java 11
+        uses: actions/setup-java@v1
+        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
+
+      - name: Publish snapshot to oss.jfrog.org
+        run: ./gradlew artifactoryPublish
+        env:
+          BINTRAY_USER: ${{ secrets.BINTRAY_USER }}
+          BINTRAY_KEY:  ${{ secrets.BINTRAY_KEY }}
+
+
+  release:
+    runs-on: ubuntu-latest
+    needs: build
+    if: |
+      github.event_name == 'push' &&
+      startsWith( github.ref, 'refs/tags/' ) &&
+      github.repository == 'JFormDesigner/FlatLaf'
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Setup Java 11
+        uses: actions/setup-java@v1
+        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
+
+      - name: Release a new stable version to bintray
+        run: ./gradlew bintrayUpload -Drelease=true
+        env:
+          BINTRAY_USER: ${{ secrets.BINTRAY_USER }}
+          BINTRAY_KEY:  ${{ secrets.BINTRAY_KEY }}

.travis.yml

@@ -1,39 +0,0 @@
-language: java
-sudo: false
-
-jdk:
-  - openjdk8
-  - openjdk9
-  - openjdk11
-  - openjdk13
-
-before_cache:
-  - rm -f  $HOME/.gradle/caches/modules-2/modules-2.lock
-  - rm -fr $HOME/.gradle/caches/*/plugin-resolution/
-cache:
-  directories:
-    - $HOME/.gradle/caches/
-    - $HOME/.gradle/wrapper/
-
-before_install:
-  - ./gradlew --version
-  - java -version
-
-stages:
-  - name: test
-  - name: snapshot
-    if: branch = master AND type IN (push) AND tag IS blank
-  - name: release
-    if: type IN (push) AND tag IS present
-
-jobs:
-  include:
-    # publish snapshot to oss.jfrog.org
-    - stage: snapshot
-      jdk: openjdk11
-      script: ./gradlew artifactoryPublish
-
-    # release a new stable version to bintray
-    - stage: release
-      jdk: openjdk11
-      script: ./gradlew bintrayUpload -Drelease=true

CHANGELOG.md

@@ -1,6 +1,453 @@
 FlatLaf Change Log
 ==================
 
+## 0.46
+
+#### New features and improvements
+
+- Slider and JIDE RangeSlider: Clicking on track now immediately moves the thumb
+  to mouse location and starts dragging the thumb. Use `UIManager.put(
+  "Slider.scrollOnTrackClick", true )` to enable old behavior that scrolls the
+  thumb when clicking on track.
+- Slider: Snap to ticks is now done while dragging the thumb. Use
+  `UIManager.put( "Slider.snapToTicksOnReleased", true )` to enable old behavior
+  that snaps to ticks on mouse released.
+- Extras: Added standard component extension classes that provides easy access
+  to FlatLaf specific client properties (see package
+  `com.formdev.flatlaf.extras.components`).
+- Extras: Renamed tri-state check box class from
+  `com.formdev.flatlaf.extras.TriStateCheckBox` to
+  `com.formdev.flatlaf.extras.components.FlatTriStateCheckBox`. Also
+  changed/improved API and added javadoc.
+- Extras: Renamed SVG utility class from `com.formdev.flatlaf.extras.SVGUtils`
+  to `com.formdev.flatlaf.extras.FlatSVGUtils`.
+- IntelliJ Themes: Added flag whether a theme is dark to
+  `FlatAllIJThemes.INFOS`. (issue #221)
+- JIDE Common Layer: Support `TristateCheckBox`.
+
+
+#### Fixed bugs
+
+- Slider: Fixed painting of colored track if `JSlider.inverted` is `true`.
+- Table and TableHeader: Fixed missing right vertical grid line if using table
+  as row header in scroll pane. (issues #152 and #46)
+- TableHeader: Fixed position of column separators in right-to-left component
+  orientation.
+- ToolTip: Fixed drop shadow for wide tooltips on Windows and Java 9+. (issue
+  #224)
+- SwingX: Fixed striping background highlighting color (e.g. alternating table
+  rows) in dark themes.
+- Fixed: If text antialiasing is disabled (in OS system settings or via
+  `-Dawt.useSystemAAFontSettings=off`), then some components still did use
+  antialiasing to render text (not-editable ComboBox, ProgressBar, Slider,
+  TabbedPane and multiline ToolTip). (issue #227)
+
+
+## 0.45
+
+#### New features and improvements
+
+- Slider: New design, added hover and pressed feedback and improved customizing.
+  (PR #214)
+- JIDE Common Layer: Support `RangeSlider`. (PR #209)
+- IntelliJ Themes:
+  - Added "Gradianto Nature Green" theme.
+  - Updated "Arc Dark", "Cyan", "Dark purple", "Gradianto", "Gray", "Gruvbox"
+    and "One Dark" themes.
+- TabbedPane: Support hiding tab area if it contains only one tab. (set client
+  property `JTabbedPane.hideTabAreaWithOneTab` to `true`)
+- MenuBar: Support different underline menu selection style UI defaults for
+  `MenuBar` and `MenuItem`. (PR #217; issue #216)
+
+
+#### Fixed bugs
+
+- Table: Do not paint last vertical grid line if auto-resize mode is not off.
+  (issue #46)
+- Table: Fixed unstable grid line thickness when scaled on HiDPI screens. (issue
+  #152)
+- TabbedPane: No longer add (internal) tab close button component as child to
+  `JTabbedPane`. (issue #219)
+- Custom window decorations: Title bar was not hidden if window is in
+  full-screen mode. (issue #212)
+
+
+## 0.44
+
+#### New features and improvements
+
+- TabbedPane: In scroll tab layout, added "Show Hidden Tabs" button to trailing
+  side of tab area. If pressed, it shows a popup menu that contains (partly)
+  hidden tabs and selecting one activates that tab. (PR #190; issue #40)
+- TabbedPane: Support forward/backward scroll arrow buttons on both sides of tab
+  area. Backward button on left side, forward button on right side. Not
+  applicable scroll buttons are hidden. (PR #211; issue #40)
+- TabbedPane: Support specifying default tab layout policy for all tabbed panes
+  in the application via UI value `TabbedPane.tabLayoutPolicy`. E.g. invoke
+  `UIManager.put( "TabbedPane.tabLayoutPolicy", "scroll" );` to use scroll
+  layout.
+- TabbedPane: Support tab scrolling with mouse wheel (in scroll tab layout). (PR
+  #187; issue #40)
+- TabbedPane: Repeat scrolling as long as scroll arrow buttons are pressed. (PR
+  #187; issue #40)
+- TabbedPane: Support adding custom components to left and right sides of tab
+  area. (set client property `JTabbedPane.leadingComponent` or
+  `JTabbedPane.trailingComponent` to a `java.awt.Component`) (PR #192; issue
+  #40)
+- TabbedPane: Support closable tabs. (PR #193; issues #31 and #40)
+- TabbedPane: Support minimum or maximum tab widths. (set client property
+  `JTabbedPane.minimumTabWidth` or `JTabbedPane.maximumTabWidth` to an integer)
+  (PR #199)
+- TabbedPane: Support alignment of tab area. (set client property
+  `JTabbedPane.tabAreaAlignment` to `"leading"`, `"trailing"`, `"center"` or
+  `"fill"`) (PR #199)
+- TabbedPane: Support horizontal alignment of tab title and icon. (set client
+  property `JTabbedPane.tabAlignment` to `SwingConstants.LEADING`,
+  `SwingConstants.TRAILING` or `SwingConstants.CENTER`)
+- TabbedPane: Support equal and compact tab width modes. (set client property
+  `JTabbedPane.tabWidthMode` to `"preferred"`, `"equal"` or `"compact"`) (PR
+  #199)
+- TabbedPane: Support left, right, top and bottom tab icon placement. (set
+  client property `JTabbedPane.tabIconPlacement` to `SwingConstants.LEADING`,
+  `SwingConstants.TRAILING`, `SwingConstants.TOP` or `SwingConstants.BOTTOM`)
+  (PR #199)
+- Support painting separator line between window title and content (use UI value
+  `TitlePane.borderColor`). (issue #184)
+- Extras: `FlatSVGIcon` now allows specifying icon width and height in
+  constructors. (issue #196)
+- SplitPane: Hide not applicable expand/collapse buttons. Added tooltips to
+  expand/collapse buttons. (issue #198)
+- SplitPane: Added grip to divider. Can be disabled with `UIManager.put(
+  "SplitPaneDivider.style", "plain" )`. (issue #179)
+
+
+#### Fixed bugs
+
+- Custom window decorations: Not visible menu bar is now ignored in layout.
+- Popups using `JToolTip` components did not respect their location. (issue
+  #188; regression in 0.42 in fix for #164)
+- IntelliJ Themes: Added suffix "(Material)" to names of all Material UI Lite
+  themes to avoid duplicate theme names. (issue #201)
+- Extras: `FlatSVGIcon` icons were not painted in disabled labels and disabled
+  tabs. (issue #205)
+
+
+## 0.43
+
+#### New features and improvements
+
+- TabbedPane: Made tabs separator color lighter in dark themes so that it is
+  easier to recognize the tabbed pane.
+- TabbedPane: Added top and bottom tab insets to avoid that large tab icons are
+  painted over active tab underline.
+- TabbedPane: Support hiding separator between tabs and content area (set client
+  property `JTabbedPane.showContentSeparator` to `false`).
+- CheckBoxMenuItem and RadioButtonMenuItem: Improved checkmark background colors
+  of selected menu items that have also an icon. This makes it is easier to
+  recognize selected menu items.
+- Windows: Made scaling compatible with Windows OS scaling, which distinguish
+  between "screen scaling" and "text scaling". (issue #175)
+
+#### Fixed bugs
+
+- ComboBox: If using own `JTextField` as editor, default text field border is
+  now removed to avoid duplicate border.
+- ComboBox: Limit popup width to screen width for very long items. (issue #182)
+- FileChooser: Fixed localizing special Windows folders (e.g. "Documents") and
+  enabled hiding known file extensions (if enabled in Windows Explorer). (issue
+  #178)
+- Spinner: Fixed `NullPointerException` in case that arrow buttons were removed
+  to create button-less spinner. (issue #181)
+
+
+## 0.42
+
+#### New features and improvements
+
+- Demo: Improved "SplitPane & Tabs" and "Data Components" tabs.
+- Demo: Menu items "File > Open" and "File > Save As" now show file choosers.
+- InternalFrame: Support draggable border for resizing frame inside of the
+  visible frame border. (issue #121)
+- `FlatUIDefaultsInspector` added (see [FlatLaf Extras](flatlaf-extras)). A
+  simple UI defaults inspector that shows a window with all UI defaults used in
+  current theme (look and feel).
+- Made disabled text color slightly lighter in dark themes for better
+  readability. (issue #174)
+- PasswordField: Support disabling Caps Lock warning icon. (issue #172)
+
+#### Fixed bugs
+
+- TextComponents: Fixed text color of disabled text components in dark themes.
+- Custom window decorations: Fixed wrong window placement when moving window to
+  another screen with different scaling factor. (issue #166)
+- Custom window decorations: Fixed wrong window bounds when resizing window to
+  another screen with different scaling factor. (issue #166)
+- Fixed occasional wrong positioning of heavy weight popups when using multiple
+  screens with different scaling factors. (issue #166)
+- ToolTip: Avoid that tooltip hides owner component. (issue #164)
+
+
+## 0.41
+
+#### New features and improvements
+
+- Added API to register packages or folders where FlatLaf searches for
+  application specific properties files with custom UI defaults (see
+  `FlatLaf.registerCustomDefaultsSource(...)` methods).
+- Demo: Show hint popups to guide users to some features of the FlatLaf Demo
+  application.
+- Extras: `FlatSVGIcon` now allows specifying `ClassLoader` that is used to load
+  SVG file. (issue #163)
+- Smoother transition from old to new theme, independent of UI complexity, when
+  using animated theme change (see [FlatLaf Extras](flatlaf-extras)).
+
+#### Fixed bugs
+
+- Button: "selected" state was not shown. (issue #161)
+- TextArea: Update background color property if enabled or editable state
+  changes in the same way as Swing does it for all other text components. (issue
+  #147)
+- Demo: Fixed restoring last used theme on startup. (regression in 0.39)
+- Custom window decorations: Fixed iconify, maximize and close icon colors if
+  window is inactive.
+- Custom window decorations: Fixed title pane background color in IntelliJ
+  themes if window is inactive.
+- Fixed sub-pixel text rendering in animated theme change (see
+  [FlatLaf Extras](flatlaf-extras)).
+
+#### Other Changes
+
+- Extras: Updated dependency
+  [svgSalamander](https://github.com/JFormDesigner/svgSalamander) to version
+  1.1.2.3.
+
+
+## 0.40
+
+#### New features
+
+- Table: Detect whether component is used in cell editor and automatically
+  disable round border style and reduce cell editor outer border width (used for
+  focus indicator) to zero. (issue #148)
+- ComboBox, Spinner and TextField: Support disabling round border style per
+  component, if globally enabled (set client property `JComponent.roundRect` to
+  `false`). (issue #148)
+
+#### Fixed bugs
+
+- Custom window decorations: Embedded menu bar did not always respond to mouse
+  events after adding menus and when running in JetBrains Runtime. (issue #151)
+- IntelliJ Themes: Fixed NPE in Solarized themes on scroll bar hover.
+
+
+## 0.39
+
+#### New features
+
+- Animated theme change (see [FlatLaf Extras](flatlaf-extras)). Used in Demo.
+- Demo: Added combo box above themes list to show only light or dark themes.
+- IntelliJ Themes:
+  - Added "Arc Dark", "Arc Dark - Orange", "Carbon" and "Cobalt 2" themes.
+  - Replaced "Solarized" themes with much better ones from 4lex4.
+  - Updated "Arc", "One Dark" and "Vuesion" themes.
+- ScrollPane: Enable/disable smooth scrolling per component if client property
+  "JScrollPane.smoothScrolling" is set to a `Boolean` on `JScrollPane`.
+- ScrollBar: Increased minimum thumb size on macOS and Linux from 8 to 18
+  pixels. On Windows, it is now 10 pixels. (issue #131)
+- Button: Support specifying button border width.
+- ComboBox: Changed maximum row count of popup list to 15 (was 20). Set UI value
+  `ComboBox.maximumRowCount` to any integer to use a different value.
+
+#### Fixed bugs
+
+- Custom window decorations: Fixed maximized window bounds when programmatically
+  maximizing window. E.g. restoring window state at startup. (issue #129)
+- InternalFrame: Title pane height was too small when iconify, maximize and
+  close buttons are hidden. (issue #132)
+- ToolTip: Do not show empty tooltip component if tooltip text is an empty
+  string. (issue #134)
+- ToolTip: Fixed truncated text in HTML formatted tooltip on HiDPI displays.
+  (issue #142)
+- ComboBox: Fixed width of popup, which was too small if popup is wider than
+  combo box and vertical scroll bar is visible. (issue #137)
+- MenuItem on macOS: Removed plus characters from accelerator text and made
+  modifier key order conform with macOS standard. (issue #141)
+- FileChooser: Fixed too small text field when renaming a file/directory in Flat
+  IntelliJ/Darcula themes. (issue #143)
+- IntelliJ Themes: Fixed text colors in ProgressBar. (issue #138)
+
+
+## 0.38
+
+- Hide focus indicator when window is inactive.
+- Custom window decorations: Improved/fixed window border color in dark themes.
+- Custom window decorations: Hide window border if window is maximized.
+- Custom window decorations: Center title if menu bar is embedded.
+- Custom window decorations: Cursor of components (e.g. TextField) was not
+  changed. (issue #125)
+- CheckBox: Fixed colors in light IntelliJ themes. (issue #126; regression in
+  0.37)
+- InternalFrame: Use default icon in internal frames. (issue #122)
+
+
+## 0.37
+
+- Custom window decorations (Windows 10 only; PR #108; issues #47 and #82)
+  support:
+  - dark window title panes
+  - embedding menu bar into window title pane
+  - native Windows 10 borders and behavior when running in
+    [JetBrains Runtime 11](https://confluence.jetbrains.com/display/JBR/JetBrains+Runtime)
+    or later (the JRE that IntelliJ IDEA uses)
+- CheckBox and RadioButton: Support changing selected icon style from outline to
+  filled (as in FlatLaf IntelliJ theme) with `UIManager.put(
+  "CheckBox.icon.style", "filled" );`.
+- Button and ToggleButton: Support disabled background color (use UI values
+  `Button.disabledBackground` and `ToggleButton.disabledBackground`). (issue
+  #112)
+- Button and ToggleButton: Support making buttons square (set client property
+  `JButton.squareSize` to `true`). (issue #118)
+- ScrollBar: Support pressed track, thumb and button colors (use UI values
+  `ScrollBar.pressedTrackColor`, `ScrollBar.pressedThumbColor` and
+  `ScrollBar.pressedButtonBackground`). (issue #115)
+- ComboBox: Support changing arrow button style (set UI value
+  `ComboBox.buttonStyle` to `auto` (default), `button` or `none`). (issue #114)
+- Spinner: Support changing arrows button style (set UI value
+  `Spinner.buttonStyle` to `button` (default) or `none`).
+- TableHeader: Support top/bottom/left positioned sort arrow when using
+  [Glazed Lists](https://github.com/glazedlists/glazedlists). (issue #113)
+- Button, CheckBox, RadioButton and ToggleButton: Do not paint focus indicator
+  if `AbstractButton.isFocusPainted()` returns `false`.
+- ComboBox: Increase maximum row count of popup list to 20 (was 8). Set UI value
+  `ComboBox.maximumRowCount` to any integer to use a different value.
+- Fixed/improved vertical position of text when scaled on HiDPI screens on
+  Windows.
+- IntelliJ Themes: Updated Gradianto Themes.
+- IntelliJ Themes: Fixed menu bar and menu item margins in all Material UI Lite
+  themes.
+
+
+## 0.36
+
+- ScrollBar: Made styling more flexible by supporting insets and arc for track
+  and thumb. (issue #103)
+- ScrollBar: Use round thumb on macOS and Linux to make it look similar to
+  native platform scroll bars. (issue #103)
+- ComboBox: Minimum width is now 72 pixels (was ~50 for non-editable and ~130
+  for editable comboboxes).
+- ComboBox: Support custom borders in combobox editors. (issue #102)
+- Button: Support non-square icon-only buttons. (issue #110)
+- Ubuntu Linux: Fixed poorly rendered font. (issue #105)
+- macOS Catalina: Use Helvetica Neue font.
+- `FlatInspector` added (see [FlatLaf Extras](flatlaf-extras)).
+
+
+## 0.35
+
+- Added drop shadows to popup menus, combobox popups, tooltips and internal
+  frames. (issue #94)
+- Support different component border colors to indicate errors, warnings or
+  custom state (set client property `JComponent.outline` to `error`, `warning`
+  or any `java.awt.Color`).
+- Button and ToggleButton: Support round button style (set client property
+  `JButton.buttonType` to `roundRect`).
+- ComboBox, Spinner and TextField: Support round border style (set client
+  property `JComponent.roundRect` to `true`).
+- Paint nicely rounded buttons, comboboxes, spinners and text fields when
+  setting `Button.arc`, `Component.arc` or `TextComponent.arc` to a large value
+  (e.g. 1000).
+- Added Java 9 module descriptor to `flatlaf-extras-<version>.jar` and
+  `flatlaf-swingx-<version>.jar`.
+- CheckBox and RadioButton: Flag `opaque` is no longer ignored when checkbox or
+  radio button is used as table cell renderer. (issue #77)
+- FileChooser: Use system icons. (issue #100)
+- FileChooser: Fixed missing labels in file chooser when running on Java 9 or
+  later. (issue #98)
+- PasswordField: Do not apply minimum width if `columns` property is greater
+  than zero.
+
+
+## 0.34
+
+- Menus: New menu item renderer brings stable left margins, right aligned
+  accelerators and larger gap between text and accelerator. This makes menus
+  look more modern and more similar to native platform menus.
+- New underline menu selection style that displays selected menu items similar
+  to tabs (to enable use `UIManager.put( "MenuItem.selectionType", "underline"
+  );`).
+- Menus: Fixed text color of selected menu items that use HTML. (issue #87)
+- Menus: On Windows, pressing <kbd>F10</kbd> now activates the menu bar without
+  showing a menu popup (as usual on Windows platform). On other platforms the
+  first menu popup is shown.
+- Menus: On Windows, releasing <kbd>Alt</kbd> key now activates the menu bar (as
+  usual on Windows platform). (issue #43)
+- Menus: Fixed inconsistent left padding in menu items. (issue #3)
+- Menus: Fixed: Setting `iconTextGap` property on a menu item did increase left
+  and right margins. (issue #54)
+- Hide mnemonics if window is deactivated (e.g. <kbd>Alt+Tab</kbd> to another
+  window). (issue #43)
+- macOS: Enabled drop shadows for popup menus and combobox popups. (issue #94)
+- macOS: Fixed NPE if using `JMenuBar` in `JInternalFrame` and macOS screen menu
+  bar is enabled (with `-Dapple.laf.useScreenMenuBar=true`). (issue #90)
+
+
+## 0.33
+
+- Improved creation of disabled grayscale icons used in disabled buttons, labels
+  and tabs. They now have more contrast and are lighter in light themes and
+  darker in dark themes. (issue #70)
+- IntelliJ Themes: Fixed ComboBox size and Spinner border in all Material UI
+  Lite themes and limit tree row height in all Material UI Lite themes and some
+  other themes.
+- IntelliJ Themes: Material UI Lite themes did not work when using
+  [IntelliJ Themes Pack](flatlaf-intellij-themes) addon. (PR #88, issue #89)
+- IntelliJ Themes: Added Java 9 module descriptor to
+  `flatlaf-intellij-themes-<version>.jar`.
+
+
+## 0.32
+
+- New [IntelliJ Themes Pack](flatlaf-intellij-themes) addon bundles many popular
+  open-source 3rd party themes from JetBrains Plugins Repository into a JAR and
+  provides Java classes to use them.
+- IntelliJ Themes: Fixed button and toggle button colors. (issue #86)
+- Updated IntelliJ Themes in demo to the latest versions.
+- ToggleButton: Compute selected background color based on current component
+  background. (issue #32)
+
+
+## 0.31
+
+- Focus indication border (or background) no longer hidden when temporary
+  loosing focus (e.g. showing a popup menu).
+- List, Table and Tree: Item selection color of focused components no longer
+  change from blue to gray when temporary loosing focus (e.g. showing a popup
+  menu).
+
+
+## 0.30
+
+- Windows: Fixed rendering of Unicode characters. Previously not all Unicode
+  characters were rendered on Windows. (issue #81)
+
+
+## 0.29
+
+- Linux: Fixed scaling if `GDK_SCALE` environment variable is set or if running
+  on JetBrains Runtime. (issue #69)
+- Tree: Fixed repainting wide selection on focus gained/lost.
+- ComboBox: No longer ignore `JComboBox.prototypeDisplayValue` when computing
+  popup width. (issue #80)
+- Support changing default font used for all components with automatic scaling
+  UI if using larger font. Use `UIManager.put( "defaultFont", myFont );`
+- No longer use system property `sun.java2d.uiScale`. (Java 8 only)
+- Support specifying custom scale factor in system property `flatlaf.uiScale`
+  also for Java 9 and later.
+- Demo: Support using own FlatLaf themes (`.properties` files) that are located
+  in working directory of Demo application. Shown in the "Themes" list under
+  category "Current Directory".
+
+
 ## 0.28
 
 - PasswordField: Warn about enabled Caps Lock.

README.md

@@ -11,19 +11,18 @@ 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 Demo](images/FlatLightDemo.png)
+![Flat Light](images/flat_light.png)
 
-![Flat Dark Demo](images/FlatDarkDemo.png)
+![Flat Dark](images/flat_dark.png)
 
 
 IntelliJ Platform Themes
 ------------------------
 
-FlatLaf can use 3rd party themes created for IntelliJ Platform:
+FlatLaf can use 3rd party themes created for IntelliJ Platform (see
+[IntelliJ Themes Pack](flatlaf-intellij-themes)):
 
-![Cyan Light Demo](images/CyanLightDemo.png)
-
-![Dark Purple Demo](images/DarkPurpleDemo.png)
+![IntelliJ Platform Themes](images/intellij_platform_themes.png)
 
 
 Demo
@@ -68,6 +67,8 @@ docs).
 Addons
 ------
 
+- [IntelliJ Themes Pack](flatlaf-intellij-themes)
+- [Extras](flatlaf-extras)
 - [SwingX](flatlaf-swingx)
 - [JIDE Common Layer](flatlaf-jide-oss)
 
@@ -75,20 +76,76 @@ Addons
 Projects using FlatLaf
 ----------------------
 
-- [NetBeans](https://netbeans.apache.org/) 11.3
+- [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
 - [KeyStore Explorer](https://keystore-explorer.org/) 5.4.3
-- [OWASP Zed Attack Proxy (ZAP)](https://www.zaproxy.org/) (in weekly releases)
-- [j-lawyer](https://github.com/jlawyerorg/j-lawyer-org)
-- [Rest Suite](https://github.com/supanadit/restsuite)
-- [ControllerBuddy](https://github.com/bwRavencl/ControllerBuddy)
-- [SpringRemote](https://github.com/HaleyWang/SpringRemote)
+- ![New](images/new.svg) [OWASP ZAP](https://www.zaproxy.org/) 2.10 - the worlds
+  most widely used web app scanner
+- ![New](images/new.svg) [JOSM](https://josm.openstreetmap.de/) - an extensible
+  editor for [OpenStreetMap](https://www.openstreetmap.org/) (requires FlatLaf
+  JOSM plugin)
+- [jAlbum](https://jalbum.net/) 21 (commercial) - creates photo album websites
+- [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
+- [GUIslice Builder](https://github.com/ImpulseAdventure/GUIslice-Builder)
+  0.13.b024 - GUI builder for
+  [GUIslice](https://github.com/ImpulseAdventure/GUIslice), a lightweight GUI
+  framework for embedded displays
+- [Rest Suite](https://github.com/supanadit/restsuite) - Rest API testing
+- [ControllerBuddy](https://github.com/bwRavencl/ControllerBuddy) - advanced
+  gamepad mapping software
+- [SpringRemote](https://github.com/HaleyWang/SpringRemote) - remote Linux SSH
+  connections manager
+- ![New](images/new.svg) [jEnTunnel](https://github.com/ggrandes/jentunnel) -
+  manage SSH Tunnels made easy
 - [mendelson AS2](https://sourceforge.net/projects/mec-as2/),
   [AS4](https://sourceforge.net/projects/mendelson-as4/) and
   [OFTP2](https://sourceforge.net/projects/mendelson-oftp2/) (open-source) and
   [mendelson AS2](https://mendelson-e-c.com/as2/),
   [AS4](https://mendelson-e-c.com/as4/) and
   [OFTP2](https://mendelson-e-c.com/oftp2) (commercial)
+- [MeteoInfo](https://github.com/meteoinfo/MeteoInfo) 2.2 - GIS and scientific
+  computation environment for meteorological community
+- [lsfusion platform](https://github.com/lsfusion/platform) - information
+  systems development platform
+- ![New](images/new.svg) [JPass](https://github.com/gaborbata/jpass) - password
+  manager with strong encryption
+- [Jes - Die Java-E<>R](https://www.jes-eur.de)
+- [Mapton](https://mapton.org/) 2.0
+  ([source code](https://github.com/trixon/mapton)) based on NetBeans platform -
+  some kind of map application
+- [Pseudo Assembler IDE](https://github.com/tomasz-herman/PseudoAssemblerIDE) -
+  IDE for Pseudo-Assembler
+- ![New](images/new.svg) [Linotte](https://github.com/cpc6128/LangageLinotte)
+  3.1 - French programming language created to learn programming
+- ![New](images/new.svg) [MEKA](https://github.com/Waikato/meka) 1.9.3 -
+  multi-label classifiers and evaluation procedures using the Weka machine
+  learning framework
+- ![New](images/new.svg) [Shutter Encoder](https://www.shutterencoder.com/) 14.2
+  ([source code](https://github.com/paulpacifico/shutter-encoder)) -
+  professional video converter and compression tool (screenshots show **old**
+  look)
+- [Sound Analysis](https://github.com/tomasz-herman/SoundAnalysis) - analyze
+  sound files in time or frequency domain
+- [RemoteLight](https://github.com/Drumber/RemoteLight) - multifunctional LED
+  control software
+- ![New](images/new.svg)
+  [ThunderFocus](https://github.com/marcocipriani01/ThunderFocus) -
+  Arduino-based telescope focuser
+- ![New](images/new.svg)
+  [Novel-Grabber](https://github.com/Flameish/Novel-Grabber) - download novels
+  from any webnovel and lightnovel site
+- ![New](images/new.svg) [lectureStudio](https://www.lecturestudio.org/)
+  4.3.1060 - digitize your lectures with ease
+- ![New](images/new.svg)
+  [Android Tool](https://github.com/fast-geek/Android-Tool) - makes popular adb
+  and fastboot commands easier to use
 - and more...
 
 

build.gradle.kts

@@ -14,8 +14,8 @@
  * limitations under the License.
  */
 
-val releaseVersion = "0.28"
-val developmentVersion = "0.29-SNAPSHOT"
+val releaseVersion = "0.46"
+val developmentVersion = "0.47-SNAPSHOT"
 
 version = if( java.lang.Boolean.getBoolean( "release" ) ) releaseVersion else developmentVersion
 
@@ -48,7 +48,7 @@ extra["bintray.dryRun"] = false
 
 // if true, uploaded artifacts are visible to all
 // if false, only visible to owner when logged into bintray
-extra["bintray.publish"] = true
+extra["bintray.publish"] = false
 
 
 allprojects {

buildSrc/build.gradle.kts

@@ -0,0 +1,34 @@
+/*
+ * Copyright 2020 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 {
+	`kotlin-dsl`
+}
+
+// required for kotlin-dsl or embedded-kotlin plugins
+repositories {
+	jcenter()
+}
+
+dependencies {
+	// NOTE: keep plugin versions in sync with settings.gradle.kts
+
+	// "com.jfrog.bintray" plugin
+	implementation( "com.jfrog.bintray.gradle:gradle-bintray-plugin:1.8.4" )
+
+	// "com.jfrog.artifactory" plugin
+	implementation( "org.jfrog.buildinfo:build-info-extractor-gradle:4.13.0" )
+}

buildSrc/src/main/java/ReorderJarEntries.java

@@ -0,0 +1,80 @@
+/*
+ * Copyright 2020 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.
+ */
+
+import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.nio.file.Files;
+import java.nio.file.StandardOpenOption;
+import java.util.function.Predicate;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipInputStream;
+import java.util.zip.ZipOutputStream;
+
+/**
+ * Reorders entries in a JAR file so that .properties files are placed before .class files,
+ * which is necessary to workaround an issue in NetBeans 11.3 (and older).
+ * See issues #13 and #93.
+ *
+ * @author Karl Tauber
+ */
+public class ReorderJarEntries
+{
+	public static void reorderJarEntries( File jarFile )
+		throws IOException
+	{
+		ByteArrayOutputStream outStream = new ByteArrayOutputStream( (int) jarFile.length() + 1000 );
+
+		try( ZipOutputStream zipOutStream = new ZipOutputStream( outStream ) ) {
+			// 1st pass: copy .properties files
+			copyFiles( zipOutStream, jarFile, name -> name.endsWith( ".properties" ) );
+
+			// 2st pass: copy other files
+			copyFiles( zipOutStream, jarFile, name -> !name.endsWith( ".properties" ) );
+		}
+
+		// replace JAR
+		Files.write( jarFile.toPath(), outStream.toByteArray(),
+			StandardOpenOption.CREATE, StandardOpenOption.TRUNCATE_EXISTING );
+	}
+
+	private static void copyFiles( ZipOutputStream dest, File jarFile, Predicate<String> filter )
+		throws IOException
+	{
+		try( ZipInputStream zipInputStream = new ZipInputStream( new FileInputStream( jarFile ) ) ) {
+			ZipEntry entry;
+			while( (entry = zipInputStream.getNextEntry()) != null ) {
+				if( filter.test( entry.getName() ) ) {
+					dest.putNextEntry( entry );
+					copyFile( zipInputStream, dest );
+				}
+			}
+		}
+	}
+
+	private static void copyFile( InputStream src, OutputStream dest )
+		throws IOException
+	{
+		byte[] buf = new byte[8*1024];
+		int len;
+		while( (len = src.read( buf )) > 0 )
+			dest.write( buf, 0, len );
+		dest.flush();
+	}
+}

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

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2020 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
+}
+
+if( JavaVersion.current() >= JavaVersion.VERSION_1_9 ) {
+	sourceSets {
+		create( "java9" ) {
+			java {
+				setSrcDirs( listOf( "src/main/java9" ) )
+			}
+		}
+	}
+
+	tasks {
+		named<JavaCompile>( "compileJava9Java" ) {
+			sourceCompatibility = "9"
+			targetCompatibility = "9"
+		}
+
+		jar {
+			manifest.attributes( "Multi-Release" to "true" )
+
+			into( "META-INF/versions/9" ) {
+				from( sourceSets["java9"].output )
+			}
+		}
+	}
+}

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

@@ -0,0 +1,64 @@
+/*
+ * Copyright 2020 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 ModuleInfoExtension {
+	var paths: ArrayList<String> = ArrayList()
+
+	fun dependsOn( vararg paths: String ) {
+		this.paths.addAll( paths )
+	}
+}
+
+val extension = project.extensions.create<ModuleInfoExtension>( "flatlafModuleInfo" )
+
+
+plugins {
+	java
+}
+
+if( JavaVersion.current() >= JavaVersion.VERSION_1_9 ) {
+	sourceSets {
+		create( "module-info" ) {
+			java {
+				// include "src/main/java" here to get compile errors if classes are
+				// used from other modules that are not specified in module dependencies
+				setSrcDirs( listOf( "src/main/module-info", "src/main/java" ) )
+			}
+		}
+	}
+
+	tasks {
+		named<JavaCompile>( "compileModuleInfoJava" ) {
+			sourceCompatibility = "9"
+			targetCompatibility = "9"
+
+			dependsOn( extension.paths )
+
+			options.compilerArgs.add( "--module-path" )
+			options.compilerArgs.add( configurations.runtimeClasspath.get().asPath )
+		}
+
+		jar {
+			manifest.attributes( "Multi-Release" to "true" )
+
+			into( "META-INF/versions/9" ) {
+				from( sourceSets["module-info"].output ) {
+					include( "module-info.class" )
+				}
+			}
+		}
+	}
+}

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

@@ -0,0 +1,116 @@
+/*
+ * Copyright 2020 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 PublishExtension {
+	var artifactId: String? = null
+	var name: String? = null
+	var description: String? = null
+}
+
+val extension = project.extensions.create<PublishExtension>( "flatlafPublish" )
+
+
+plugins {
+	`maven-publish`
+	id( "com.jfrog.bintray" )
+	id( "com.jfrog.artifactory" )
+}
+
+publishing {
+	publications {
+		create<MavenPublication>( "maven" ) {
+			afterEvaluate {
+				artifactId = extension.artifactId
+			}
+			groupId = "com.formdev"
+
+			from( components["java"] )
+
+			pom {
+				afterEvaluate {
+					this@pom.name.set( extension.name )
+					this@pom.description.set( extension.description )
+				}
+				url.set( "https://github.com/JFormDesigner/FlatLaf" )
+
+				licenses {
+					license {
+						name.set( "The Apache License, Version 2.0" )
+						url.set( "https://www.apache.org/licenses/LICENSE-2.0.txt" )
+					}
+				}
+
+				developers {
+					developer {
+						name.set( "Karl Tauber" )
+						organization.set( "FormDev Software GmbH" )
+						organizationUrl.set( "https://www.formdev.com/" )
+					}
+				}
+
+				scm {
+					url.set( "https://github.com/JFormDesigner/FlatLaf" )
+				}
+			}
+		}
+	}
+}
+
+bintray {
+	user = rootProject.extra["bintray.user"] as String?
+	key = rootProject.extra["bintray.key"] as String?
+
+	setPublications( "maven" )
+
+	with( pkg ) {
+		repo = "flatlaf"
+		afterEvaluate {
+			this@with.name = extension.artifactId
+		}
+		setLicenses( "Apache-2.0" )
+		vcsUrl = "https://github.com/JFormDesigner/FlatLaf"
+
+		with( version ) {
+			name = project.version.toString()
+		}
+
+		publish = rootProject.extra["bintray.publish"] as Boolean
+		dryRun = rootProject.extra["bintray.dryRun"] as Boolean
+	}
+}
+
+artifactory {
+	setContextUrl( "https://oss.jfrog.org" )
+
+	publish( closureOf<org.jfrog.gradle.plugin.artifactory.dsl.PublisherConfig> {
+		repository( delegateClosureOf<groovy.lang.GroovyObject> {
+			setProperty( "repoKey", "oss-snapshot-local" )
+			setProperty( "username", rootProject.extra["bintray.user"] as String? )
+			setProperty( "password", rootProject.extra["bintray.key"] as String? )
+		} )
+
+		defaults( delegateClosureOf<groovy.lang.GroovyObject> {
+			invokeMethod( "publications", "maven" )
+			setProperty( "publishArtifacts", true )
+			setProperty( "publishPom", true )
+		} )
+	} )
+
+	resolve( delegateClosureOf<org.jfrog.gradle.plugin.artifactory.dsl.ResolverConfig> {
+		setProperty( "repoKey", "jcenter" )
+	} )
+}

flatlaf-core/.settings/org.eclipse.jdt.core.prefs

@@ -0,0 +1,377 @@
+eclipse.preferences.version=1
+org.eclipse.jdt.core.formatter.align_assignment_statements_on_columns=false
+org.eclipse.jdt.core.formatter.align_fields_grouping_blank_lines=2147483647
+org.eclipse.jdt.core.formatter.align_type_members_on_columns=false
+org.eclipse.jdt.core.formatter.align_variable_declarations_on_columns=false
+org.eclipse.jdt.core.formatter.align_with_spaces=false
+org.eclipse.jdt.core.formatter.alignment_for_additive_operator=16
+org.eclipse.jdt.core.formatter.alignment_for_arguments_in_allocation_expression=16
+org.eclipse.jdt.core.formatter.alignment_for_arguments_in_annotation=0
+org.eclipse.jdt.core.formatter.alignment_for_arguments_in_enum_constant=16
+org.eclipse.jdt.core.formatter.alignment_for_arguments_in_explicit_constructor_call=16
+org.eclipse.jdt.core.formatter.alignment_for_arguments_in_method_invocation=16
+org.eclipse.jdt.core.formatter.alignment_for_arguments_in_qualified_allocation_expression=16
+org.eclipse.jdt.core.formatter.alignment_for_assignment=0
+org.eclipse.jdt.core.formatter.alignment_for_bitwise_operator=16
+org.eclipse.jdt.core.formatter.alignment_for_compact_if=16
+org.eclipse.jdt.core.formatter.alignment_for_compact_loops=16
+org.eclipse.jdt.core.formatter.alignment_for_conditional_expression=48
+org.eclipse.jdt.core.formatter.alignment_for_conditional_expression_chain=0
+org.eclipse.jdt.core.formatter.alignment_for_enum_constants=16
+org.eclipse.jdt.core.formatter.alignment_for_expressions_in_array_initializer=16
+org.eclipse.jdt.core.formatter.alignment_for_expressions_in_for_loop_header=0
+org.eclipse.jdt.core.formatter.alignment_for_logical_operator=16
+org.eclipse.jdt.core.formatter.alignment_for_method_declaration=0
+org.eclipse.jdt.core.formatter.alignment_for_module_statements=16
+org.eclipse.jdt.core.formatter.alignment_for_multiple_fields=16
+org.eclipse.jdt.core.formatter.alignment_for_multiplicative_operator=16
+org.eclipse.jdt.core.formatter.alignment_for_parameterized_type_references=0
+org.eclipse.jdt.core.formatter.alignment_for_parameters_in_constructor_declaration=16
+org.eclipse.jdt.core.formatter.alignment_for_parameters_in_method_declaration=16
+org.eclipse.jdt.core.formatter.alignment_for_record_components=16
+org.eclipse.jdt.core.formatter.alignment_for_relational_operator=0
+org.eclipse.jdt.core.formatter.alignment_for_resources_in_try=80
+org.eclipse.jdt.core.formatter.alignment_for_selector_in_method_invocation=16
+org.eclipse.jdt.core.formatter.alignment_for_shift_operator=0
+org.eclipse.jdt.core.formatter.alignment_for_string_concatenation=16
+org.eclipse.jdt.core.formatter.alignment_for_superclass_in_type_declaration=33
+org.eclipse.jdt.core.formatter.alignment_for_superinterfaces_in_enum_declaration=33
+org.eclipse.jdt.core.formatter.alignment_for_superinterfaces_in_record_declaration=33
+org.eclipse.jdt.core.formatter.alignment_for_superinterfaces_in_type_declaration=33
+org.eclipse.jdt.core.formatter.alignment_for_throws_clause_in_constructor_declaration=32
+org.eclipse.jdt.core.formatter.alignment_for_throws_clause_in_method_declaration=32
+org.eclipse.jdt.core.formatter.alignment_for_type_arguments=0
+org.eclipse.jdt.core.formatter.alignment_for_type_parameters=0
+org.eclipse.jdt.core.formatter.alignment_for_union_type_in_multicatch=16
+org.eclipse.jdt.core.formatter.blank_lines_after_imports=1
+org.eclipse.jdt.core.formatter.blank_lines_after_last_class_body_declaration=0
+org.eclipse.jdt.core.formatter.blank_lines_after_package=1
+org.eclipse.jdt.core.formatter.blank_lines_before_abstract_method=1
+org.eclipse.jdt.core.formatter.blank_lines_before_field=0
+org.eclipse.jdt.core.formatter.blank_lines_before_first_class_body_declaration=0
+org.eclipse.jdt.core.formatter.blank_lines_before_imports=1
+org.eclipse.jdt.core.formatter.blank_lines_before_member_type=1
+org.eclipse.jdt.core.formatter.blank_lines_before_method=1
+org.eclipse.jdt.core.formatter.blank_lines_before_new_chunk=1
+org.eclipse.jdt.core.formatter.blank_lines_before_package=0
+org.eclipse.jdt.core.formatter.blank_lines_between_import_groups=0
+org.eclipse.jdt.core.formatter.blank_lines_between_statement_group_in_switch=0
+org.eclipse.jdt.core.formatter.blank_lines_between_type_declarations=1
+org.eclipse.jdt.core.formatter.brace_position_for_annotation_type_declaration=end_of_line
+org.eclipse.jdt.core.formatter.brace_position_for_anonymous_type_declaration=end_of_line
+org.eclipse.jdt.core.formatter.brace_position_for_array_initializer=end_of_line
+org.eclipse.jdt.core.formatter.brace_position_for_block=next_line_on_wrap
+org.eclipse.jdt.core.formatter.brace_position_for_block_in_case=end_of_line
+org.eclipse.jdt.core.formatter.brace_position_for_constructor_declaration=next_line_on_wrap
+org.eclipse.jdt.core.formatter.brace_position_for_enum_constant=end_of_line
+org.eclipse.jdt.core.formatter.brace_position_for_enum_declaration=end_of_line
+org.eclipse.jdt.core.formatter.brace_position_for_lambda_body=end_of_line
+org.eclipse.jdt.core.formatter.brace_position_for_method_declaration=next_line_on_wrap
+org.eclipse.jdt.core.formatter.brace_position_for_record_constructor=next_line_on_wrap
+org.eclipse.jdt.core.formatter.brace_position_for_record_declaration=next_line
+org.eclipse.jdt.core.formatter.brace_position_for_switch=end_of_line
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+org.eclipse.jdt.core.formatter.keep_then_statement_on_same_line=false
+org.eclipse.jdt.core.formatter.keep_type_declaration_on_one_line=one_line_never
+org.eclipse.jdt.core.formatter.lineSplit=120
+org.eclipse.jdt.core.formatter.never_indent_block_comments_on_first_column=false
+org.eclipse.jdt.core.formatter.never_indent_line_comments_on_first_column=false
+org.eclipse.jdt.core.formatter.number_of_blank_lines_after_code_block=0
+org.eclipse.jdt.core.formatter.number_of_blank_lines_at_beginning_of_code_block=0
+org.eclipse.jdt.core.formatter.number_of_blank_lines_at_beginning_of_method_body=0
+org.eclipse.jdt.core.formatter.number_of_blank_lines_at_end_of_code_block=0
+org.eclipse.jdt.core.formatter.number_of_blank_lines_at_end_of_method_body=0
+org.eclipse.jdt.core.formatter.number_of_blank_lines_before_code_block=0
+org.eclipse.jdt.core.formatter.number_of_empty_lines_to_preserve=1
+org.eclipse.jdt.core.formatter.parentheses_positions_in_annotation=common_lines
+org.eclipse.jdt.core.formatter.parentheses_positions_in_catch_clause=common_lines
+org.eclipse.jdt.core.formatter.parentheses_positions_in_enum_constant_declaration=common_lines
+org.eclipse.jdt.core.formatter.parentheses_positions_in_for_statment=common_lines
+org.eclipse.jdt.core.formatter.parentheses_positions_in_if_while_statement=common_lines
+org.eclipse.jdt.core.formatter.parentheses_positions_in_lambda_declaration=common_lines
+org.eclipse.jdt.core.formatter.parentheses_positions_in_method_delcaration=common_lines
+org.eclipse.jdt.core.formatter.parentheses_positions_in_method_invocation=common_lines
+org.eclipse.jdt.core.formatter.parentheses_positions_in_record_declaration=common_lines
+org.eclipse.jdt.core.formatter.parentheses_positions_in_switch_statement=common_lines
+org.eclipse.jdt.core.formatter.parentheses_positions_in_try_clause=common_lines
+org.eclipse.jdt.core.formatter.put_empty_statement_on_new_line=true
+org.eclipse.jdt.core.formatter.tabulation.char=tab
+org.eclipse.jdt.core.formatter.tabulation.size=4
+org.eclipse.jdt.core.formatter.text_block_indentation=0
+org.eclipse.jdt.core.formatter.use_on_off_tags=false
+org.eclipse.jdt.core.formatter.use_tabs_only_for_leading_indentations=false
+org.eclipse.jdt.core.formatter.wrap_before_additive_operator=true
+org.eclipse.jdt.core.formatter.wrap_before_assignment_operator=false
+org.eclipse.jdt.core.formatter.wrap_before_bitwise_operator=true
+org.eclipse.jdt.core.formatter.wrap_before_conditional_operator=true
+org.eclipse.jdt.core.formatter.wrap_before_logical_operator=false
+org.eclipse.jdt.core.formatter.wrap_before_multiplicative_operator=true
+org.eclipse.jdt.core.formatter.wrap_before_or_operator_multicatch=true
+org.eclipse.jdt.core.formatter.wrap_before_relational_operator=true
+org.eclipse.jdt.core.formatter.wrap_before_shift_operator=true
+org.eclipse.jdt.core.formatter.wrap_before_string_concatenation=true
+org.eclipse.jdt.core.formatter.wrap_outer_expressions_when_nested=true
+org.eclipse.jdt.core.javaFormatter=org.eclipse.jdt.core.defaultJavaFormatter

flatlaf-core/.settings/org.eclipse.jdt.ui.prefs

@@ -0,0 +1,3 @@
+eclipse.preferences.version=1
+formatter_profile=_FlatLaf
+formatter_settings_version=19

flatlaf-core/build.gradle.kts

@@ -16,150 +16,46 @@
 
 plugins {
 	`java-library`
-	`maven-publish`
-	id( "com.jfrog.bintray" )
-	id( "com.jfrog.artifactory" )
+	`flatlaf-module-info`
+	`flatlaf-java9`
+	`flatlaf-publish`
 }
 
-if( JavaVersion.current() >= JavaVersion.VERSION_1_9 ) {
-	sourceSets {
-		create( "module-info" ) {
-			java {
-				// include "src/main/java" here to get compile errors if classes are
-				// used from other modules that are not specified in module dependencies
-				setSrcDirs( listOf( "src/main/module-info", "src/main/java" ) )
-			}
-		}
-	}
+java {
+	withSourcesJar()
+	withJavadocJar()
 }
 
 tasks {
-	assemble {
-		dependsOn(
-			"sourcesJar",
-			"javadocJar"
-		)
-	}
-
-	if( JavaVersion.current() >= JavaVersion.VERSION_1_9 ) {
-		named<JavaCompile>( "compileModuleInfoJava" ) {
-			sourceCompatibility = "9"
-			targetCompatibility = "9"
-		}
-	}
-
 	jar {
 		archiveBaseName.set( "flatlaf" )
 
-		if( JavaVersion.current() >= JavaVersion.VERSION_1_9 ) {
-			from( sourceSets["module-info"].output ) {
-				include( "module-info.class" )
-			}
+		doLast {
+			ReorderJarEntries.reorderJarEntries( outputs.files.singleFile );
 		}
 	}
 
 	javadoc {
 		options {
 			this as StandardJavadocDocletOptions
+			use( true )
 			tags = listOf( "uiDefault", "clientProperty" )
 			addStringOption( "Xdoclint:all,-missing", "-Xdoclint:all,-missing" )
 		}
 		isFailOnError = false
 	}
 
-	register( "sourcesJar", Jar::class ) {
+	named<Jar>("sourcesJar" ) {
 		archiveBaseName.set( "flatlaf" )
-		archiveClassifier.set( "sources" )
-
-		from( sourceSets.main.get().allJava )
 	}
 
-	register( "javadocJar", Jar::class ) {
+	named<Jar>("javadocJar" ) {
 		archiveBaseName.set( "flatlaf" )
-		archiveClassifier.set( "javadoc" )
-
-		from( javadoc )
 	}
 }
 
-publishing {
-	publications {
-		create<MavenPublication>( "maven" ) {
-			artifactId = "flatlaf"
-			groupId = "com.formdev"
-
-			from( components["java"] )
-
-			artifact( tasks["sourcesJar"] )
-			artifact( tasks["javadocJar"] )
-
-			pom {
-				name.set( "FlatLaf" )
-				description.set( "Flat Look and Feel" )
-				url.set( "https://github.com/JFormDesigner/FlatLaf" )
-
-				licenses {
-					license {
-						name.set( "The Apache License, Version 2.0" )
-						url.set( "https://www.apache.org/licenses/LICENSE-2.0.txt" )
-					}
-				}
-
-				developers {
-					developer {
-						name.set( "Karl Tauber" )
-						organization.set( "FormDev Software GmbH" )
-						organizationUrl.set( "https://www.formdev.com/" )
-					}
-				}
-
-				scm {
-					url.set( "https://github.com/JFormDesigner/FlatLaf" )
-				}
-			}
-		}
-	}
-}
-
-bintray {
-	user = rootProject.extra["bintray.user"] as String?
-	key = rootProject.extra["bintray.key"] as String?
-
-	setPublications( "maven" )
-
-	with( pkg ) {
-		repo = "flatlaf"
-		name = "flatlaf"
-		setLicenses( "Apache-2.0" )
-		vcsUrl = "https://github.com/JFormDesigner/FlatLaf"
-
-		with( version ) {
-			name = project.version.toString()
-		}
-
-		publish = rootProject.extra["bintray.publish"] as Boolean
-		dryRun = rootProject.extra["bintray.dryRun"] as Boolean
-	}
-}
-
-artifactory {
-	setContextUrl( "https://oss.jfrog.org" )
-
-	publish( closureOf<org.jfrog.gradle.plugin.artifactory.dsl.PublisherConfig> {
-		repository( delegateClosureOf<groovy.lang.GroovyObject> {
-			setProperty( "repoKey", "oss-snapshot-local" )
-			setProperty( "username", rootProject.extra["bintray.user"] as String? )
-			setProperty( "password", rootProject.extra["bintray.key"] as String? )
-		} )
-
-		defaults( delegateClosureOf<groovy.lang.GroovyObject> {
-			invokeMethod( "publications", "maven" )
-			setProperty( "publishArtifacts", true )
-			setProperty( "publishPom", true )
-		} )
-	} )
-
-	resolve( delegateClosureOf<org.jfrog.gradle.plugin.artifactory.dsl.ResolverConfig> {
-		setProperty( "repoKey", "jcenter" )
-	} )
+flatlafPublish {
+	artifactId = "flatlaf"
+	name = "FlatLaf"
+	description = "Flat Look and Feel"
 }

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

@@ -19,18 +19,26 @@ package com.formdev.flatlaf;
 import java.awt.Color;
 import java.util.Objects;
 import javax.swing.JComponent;
+import javax.swing.SwingConstants;
 
 /**
  * @author Karl Tauber
  */
 public interface FlatClientProperties
 {
+	//---- JButton ------------------------------------------------------------
+
 	/**
 	 * Specifies type of a button.
 	 * <p>
 	 * <strong>Components</strong> {@link javax.swing.JButton} and {@link javax.swing.JToggleButton}<br>
 	 * <strong>Value type</strong> {@link java.lang.String}<br>
-	 * <strong>Allowed Values</strong> {@link #BUTTON_TYPE_SQUARE} and {@link #BUTTON_TYPE_HELP}
+	 * <strong>Allowed Values</strong>
+	 *     {@link #BUTTON_TYPE_SQUARE},
+	 *     {@link #BUTTON_TYPE_ROUND_RECT},
+	 *     {@link #BUTTON_TYPE_TAB},
+	 *     {@link #BUTTON_TYPE_HELP} or
+	 *     {@link BUTTON_TYPE_TOOLBAR_BUTTON}
 	 */
 	String BUTTON_TYPE = "JButton.buttonType";
 
@@ -43,6 +51,15 @@ public interface FlatClientProperties
 	 */
 	String BUTTON_TYPE_SQUARE = "square";
 
+	/**
+	 * Paint the button with round edges.
+	 * <p>
+	 * <strong>Components</strong> {@link javax.swing.JButton} and {@link javax.swing.JToggleButton}
+	 *
+	 * @see #BUTTON_TYPE
+	 */
+	String BUTTON_TYPE_ROUND_RECT = "roundRect";
+
 	/**
 	 * Paint the toggle button in tab style.
 	 * <p>
@@ -61,6 +78,15 @@ public interface FlatClientProperties
 	 */
 	String BUTTON_TYPE_HELP = "help";
 
+	/**
+	 * Paint the button in toolbar style.
+	 * <p>
+	 * <strong>Components</strong> {@link javax.swing.JButton} and {@link javax.swing.JToggleButton}
+	 *
+	 * @see #BUTTON_TYPE
+	 */
+	String BUTTON_TYPE_TOOLBAR_BUTTON = "toolBarButton";
+
 	/**
 	 * Specifies selected state of a checkbox.
 	 * <p>
@@ -77,11 +103,22 @@ public interface FlatClientProperties
 	 */
 	String SELECTED_STATE_INDETERMINATE = "indeterminate";
 
+	/**
+	 * Specifies whether the button preferred size will be made square (quadratically).
+	 * <p>
+	 * <strong>Components</strong> {@link javax.swing.JButton} and {@link javax.swing.JToggleButton}<br>
+	 * <strong>Value type</strong> {@link java.lang.Boolean}
+	 */
+	String SQUARE_SIZE = "JButton.squareSize";
+
+	//---- JComponent ---------------------------------------------------------
+
 	/**
 	 * Specifies minimum width of a component.
 	 * <p>
-	 * <strong>Component</strong> {@link javax.swing.JButton}, {@link javax.swing.JToggleButton} and {@link javax.swing.text.JTextComponent}<br>
-	 * <strong>Value type</strong> {@link java.lang.Integer}<br>
+	 * <strong>Component</strong> {@link javax.swing.JButton}, {@link javax.swing.JToggleButton},
+	 * {@link javax.swing.JComboBox}, {@link javax.swing.JSpinner} and {@link javax.swing.text.JTextComponent}<br>
+	 * <strong>Value type</strong> {@link java.lang.Integer}
 	 */
 	String MINIMUM_WIDTH = "JComponent.minimumWidth";
 
@@ -89,10 +126,72 @@ public interface FlatClientProperties
 	 * Specifies minimum height of a component.
 	 * <p>
 	 * <strong>Component</strong> {@link javax.swing.JButton} and {@link javax.swing.JToggleButton}<br>
-	 * <strong>Value type</strong> {@link java.lang.Integer}<br>
+	 * <strong>Value type</strong> {@link java.lang.Integer}
 	 */
 	String MINIMUM_HEIGHT = "JComponent.minimumHeight";
 
+	/**
+	 * Paint the component with round edges.
+	 * <p>
+	 * <strong>Components</strong> {@link javax.swing.JComboBox}, {@link javax.swing.JSpinner},
+	 * {@link javax.swing.JTextField}, {@link javax.swing.JFormattedTextField} and {@link javax.swing.JPasswordField}<br>
+	 * <strong>Value type</strong> {@link java.lang.Boolean}
+	 */
+	String COMPONENT_ROUND_RECT = "JComponent.roundRect";
+
+	/**
+	 * Specifies the outline color of the component border.
+	 * <p>
+	 * <strong>Components</strong> {@link javax.swing.JButton}, {@link javax.swing.JComboBox},
+	 * {@link javax.swing.JFormattedTextField}, {@link javax.swing.JPasswordField},
+	 * {@link javax.swing.JScrollPane}, {@link javax.swing.JSpinner},
+	 * {@link javax.swing.JTextField} and {@link javax.swing.JToggleButton}<br>
+	 * <strong>Value type</strong> {@link java.lang.String} or {@link java.awt.Color} or {@link java.awt.Color}[2]<br>
+	 * <strong>Allowed Values</strong>
+	 *     {@link #OUTLINE_ERROR},
+	 *     {@link #OUTLINE_WARNING},
+	 *     any color (type {@link java.awt.Color}) or
+	 *     an array of two colors (type {@link java.awt.Color}[2]) where the first color
+	 *     is for focused state and the second for unfocused state
+	 */
+	String OUTLINE = "JComponent.outline";
+
+	/**
+	 * Paint the component border in another color (usually reddish) to indicate an error.
+	 *
+	 * @see #OUTLINE
+	 */
+	String OUTLINE_ERROR = "error";
+
+	/**
+	 * Paint the component border in another color (usually yellowish) to indicate a warning.
+	 *
+	 * @see #OUTLINE
+	 */
+	String OUTLINE_WARNING = "warning";
+
+	//---- Popup --------------------------------------------------------------
+
+	/**
+	 * Specifies whether a drop shadow is painted if the component is shown in a popup
+	 * or if the component is the owner of another component that is shown in a popup.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JComponent}<br>
+	 * <strong>Value type</strong> {@link java.lang.Boolean}
+	 */
+	String POPUP_DROP_SHADOW_PAINTED = "Popup.dropShadowPainted";
+
+	/**
+	 * Specifies whether a heavy weight window should be used if the component is shown in a popup
+	 * or if the component is the owner of another component that is shown in a popup.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JComponent}<br>
+	 * <strong>Value type</strong> {@link java.lang.Boolean}
+	 */
+	String POPUP_FORCE_HEAVY_WEIGHT = "Popup.forceHeavyWeight";
+
+	//---- JProgressBar -------------------------------------------------------
+
 	/**
 	 * Specifies whether the progress bar has always the larger height even if no string is painted.
 	 * <p>
@@ -109,6 +208,19 @@ public interface FlatClientProperties
 	 */
 	String PROGRESS_BAR_SQUARE = "JProgressBar.square";
 
+	//---- JRootPane ----------------------------------------------------------
+
+	/**
+	 * Specifies whether the menu bar is embedded into the title pane if custom
+	 * window decorations are enabled. Default is {@code true}.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JRootPane}<br>
+	 * <strong>Value type</strong> {@link java.lang.Boolean}
+	 */
+	String MENU_BAR_EMBEDDED = "JRootPane.menuBarEmbedded";
+
+	//---- JScrollBar / JScrollPane -------------------------------------------
+
 	/**
 	 * Specifies whether the decrease/increase arrow buttons of a scrollbar are shown.
 	 * <p>
@@ -117,6 +229,16 @@ public interface FlatClientProperties
 	 */
 	String SCROLL_BAR_SHOW_BUTTONS = "JScrollBar.showButtons";
 
+	/**
+	 * Specifies whether the scroll pane uses smooth scrolling.
+	 * <p>
+	 * <strong>Component</strong> {{@link javax.swing.JScrollPane}<br>
+	 * <strong>Value type</strong> {@link java.lang.Boolean}
+	 */
+	String SCROLL_PANE_SMOOTH_SCROLLING = "JScrollPane.smoothScrolling";
+
+	//---- JTabbedPane --------------------------------------------------------
+
 	/**
 	 * Specifies whether separators are shown between tabs.
 	 * <p>
@@ -125,6 +247,14 @@ public interface FlatClientProperties
 	 */
 	String TABBED_PANE_SHOW_TAB_SEPARATORS = "JTabbedPane.showTabSeparators";
 
+	/**
+	 * Specifies whether the separator between tabs area and content area should be shown.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JTabbedPane}<br>
+	 * <strong>Value type</strong> {@link java.lang.Boolean}
+	 */
+	String TABBED_PANE_SHOW_CONTENT_SEPARATOR = "JTabbedPane.showContentSeparator";
+
 	/**
 	 * Specifies whether a full border is painted around a tabbed pane.
 	 * <p>
@@ -133,6 +263,35 @@ public interface FlatClientProperties
 	 */
 	String TABBED_PANE_HAS_FULL_BORDER = "JTabbedPane.hasFullBorder";
 
+	/**
+	 * Specifies whether the tab area should be hidden if it contains only one tab.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JTabbedPane}<br>
+	 * <strong>Value type</strong> {@link java.lang.Boolean}
+	 */
+	String TABBED_PANE_HIDE_TAB_AREA_WITH_ONE_TAB = "JTabbedPane.hideTabAreaWithOneTab";
+
+	/**
+	 * Specifies the minimum width of a tab.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JTabbedPane}
+	 * or tab content components (see {@link javax.swing.JTabbedPane#setComponentAt(int, java.awt.Component)})<br>
+	 * <strong>Value type</strong> {@link java.lang.Integer}
+	 */
+	String TABBED_PANE_MINIMUM_TAB_WIDTH = "JTabbedPane.minimumTabWidth";
+
+	/**
+	 * Specifies the maximum width of a tab.
+	 * <p>
+	 * Applied only if tab does not have a custom tab component
+	 * (see {@link javax.swing.JTabbedPane#setTabComponentAt(int, java.awt.Component)}).
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JTabbedPane}
+	 * or tab content components (see {@link javax.swing.JTabbedPane#setComponentAt(int, java.awt.Component)})<br>
+	 * <strong>Value type</strong> {@link java.lang.Integer}
+	 */
+	String TABBED_PANE_MAXIMUM_TAB_WIDTH = "JTabbedPane.maximumTabWidth";
+
 	/**
 	 * Specifies the height of a tab.
 	 * <p>
@@ -141,14 +300,316 @@ public interface FlatClientProperties
 	 */
 	String TABBED_PANE_TAB_HEIGHT = "JTabbedPane.tabHeight";
 
+	/**
+	 * Specifies the insets of a tab.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JTabbedPane}
+	 * or tab content components (see {@link javax.swing.JTabbedPane#setComponentAt(int, java.awt.Component)})<br>
+	 * <strong>Value type</strong> {@link java.awt.Insets}
+	 */
+	String TABBED_PANE_TAB_INSETS = "JTabbedPane.tabInsets";
+
+	/**
+	 * Specifies the insets of the tab area.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JTabbedPane}<br>
+	 * <strong>Value type</strong> {@link java.awt.Insets}
+	 */
+	String TABBED_PANE_TAB_AREA_INSETS = "JTabbedPane.tabAreaInsets";
+
+	/**
+	 * Specifies whether tabs are closable.
+	 * If set to {@code true} on a tabbed pane component, all tabs in that tabbed pane are closable.
+	 * To make individual tabs closable, set it to {@code true} on a tab content component.
+	 * <p>
+	 * Note that you have to specify a callback (see {@link #TABBED_PANE_TAB_CLOSABLE})
+	 * that is invoked when the user clicks a tab close button.
+	 * The callback is responsible for closing the tab.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JTabbedPane}
+	 * or tab content components (see {@link javax.swing.JTabbedPane#setComponentAt(int, java.awt.Component)})<br>
+	 * <strong>Value type</strong> {@link java.lang.Boolean}
+	 *
+	 * @see #TABBED_PANE_TAB_CLOSE_CALLBACK
+	 */
+	String TABBED_PANE_TAB_CLOSABLE = "JTabbedPane.tabClosable";
+
+	/**
+	 * Specifies the tooltip text used for tab close buttons.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JTabbedPane}
+	 * or tab content components (see {@link javax.swing.JTabbedPane#setComponentAt(int, java.awt.Component)})<br>
+	 * <strong>Value type</strong> {@link java.lang.String}
+	 *
+	 * @see #TABBED_PANE_TAB_CLOSABLE
+	 */
+	String TABBED_PANE_TAB_CLOSE_TOOLTIPTEXT = "JTabbedPane.tabCloseToolTipText";
+
+	/**
+	 * Specifies the callback that is invoked when a tab close button is clicked.
+	 * The callback is responsible for closing the tab.
+	 * <p>
+	 * Either use a {@link java.util.function.IntConsumer} that receives the tab index as parameter:
+	 * <pre>{@code
+	 * myTabbedPane.putClientProperty( "JTabbedPane.tabCloseCallback",
+	 *     (IntConsumer) tabIndex -> {
+	 *         // close tab here
+	 *     } );
+	 * }</pre>
+	 * Or use a {@link java.util.function.BiConsumer}&lt;javax.swing.JTabbedPane, Integer&gt;
+	 * that receives the tabbed pane and the tab index as parameters:
+	 * <pre>{@code
+	 * myTabbedPane.putClientProperty( "JTabbedPane.tabCloseCallback",
+	 *     (BiConsumer<JTabbedPane, Integer>) (tabbedPane, tabIndex) -> {
+	 *         // close tab here
+	 *     } );
+	 * }</pre>
+	 * If you need to check whether a modifier key (e.g. Alt or Shift) was pressed
+	 * while the user clicked the tab close button, use {@link java.awt.EventQueue#getCurrentEvent}
+	 * to get current event, check whether it is a {@link java.awt.event.MouseEvent}
+	 * and invoke its methods. E.g.
+	 * <pre>{@code
+	 * AWTEvent e = EventQueue.getCurrentEvent();
+	 * boolean shift = (e instanceof MouseEvent) ? ((MouseEvent)e).isShiftDown() : false;
+	 * }</pre>
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JTabbedPane}
+	 * or tab content components (see {@link javax.swing.JTabbedPane#setComponentAt(int, java.awt.Component)})<br>
+	 * <strong>Value type</strong> {@link java.util.function.IntConsumer}
+	 * or {@link java.util.function.BiConsumer}&lt;javax.swing.JTabbedPane, Integer&gt;
+	 *
+	 * @see #TABBED_PANE_TAB_CLOSABLE
+	 */
+	String TABBED_PANE_TAB_CLOSE_CALLBACK = "JTabbedPane.tabCloseCallback";
+
+	/**
+	 * Specifies the display policy for the "more tabs" button,
+	 * which shows a popup menu with the (partly) hidden tabs.
+	 * <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_POLICY_NEVER} or
+	 *     {@link #TABBED_PANE_POLICY_AS_NEEDED}
+	 */
+	String TABBED_PANE_TABS_POPUP_POLICY = "JTabbedPane.tabsPopupPolicy";
+
+	/**
+	 * Specifies the display policy for the forward/backward scroll arrow buttons.
+	 * <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_POLICY_NEVER},
+	 *     {@link #TABBED_PANE_POLICY_AS_NEEDED} or
+	 *     {@link #TABBED_PANE_POLICY_AS_NEEDED_SINGLE}
+	 */
+	String TABBED_PANE_SCROLL_BUTTONS_POLICY = "JTabbedPane.scrollButtonsPolicy";
+
+	/**
+	 * Display never.
+	 *
+	 * @see #TABBED_PANE_TABS_POPUP_POLICY
+	 * @see #TABBED_PANE_SCROLL_BUTTONS_POLICY
+	 */
+	String TABBED_PANE_POLICY_NEVER = "never";
+
+	/**
+	 * Display only when needed.
+	 * <p>
+	 * If used for {@link #TABBED_PANE_SCROLL_BUTTONS_POLICY}, both scroll arrow buttons
+	 * are either shown or hidden. Buttons are disabled if scrolling in that
+	 * direction is not applicable.
+	 *
+	 * @see #TABBED_PANE_TABS_POPUP_POLICY
+	 * @see #TABBED_PANE_SCROLL_BUTTONS_POLICY
+	 */
+	String TABBED_PANE_POLICY_AS_NEEDED = "asNeeded";
+
+	/**
+	 * Display single button only when needed.
+	 * <p>
+	 * If scroll button placement is trailing, then this option is ignored
+	 * and both buttons are shown or hidden as needed.
+	 *
+	 * @see #TABBED_PANE_SCROLL_BUTTONS_POLICY
+	 */
+	String TABBED_PANE_POLICY_AS_NEEDED_SINGLE = "asNeededSingle";
+
+	/**
+	 * Specifies the placement of the forward/backward scroll arrow buttons.
+	 * <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_PLACEMENT_BOTH} or
+	 *     {@link #TABBED_PANE_PLACEMENT_TRAILING}
+	 */
+	String TABBED_PANE_SCROLL_BUTTONS_PLACEMENT = "JTabbedPane.scrollButtonsPlacement";
+
+	/**
+	 * The forward/backward scroll arrow buttons are placed on both sides of the tab area.
+	 * The backward scroll button at the left/top side.
+	 * The forward scroll button at the right/bottom side.
+	 *
+	 * @see #TABBED_PANE_SCROLL_BUTTONS_PLACEMENT
+	 */
+	String TABBED_PANE_PLACEMENT_BOTH = "both";
+
+	/**
+	 * The forward/backward scroll arrow buttons are placed on the trailing side of the tab area.
+	 *
+	 * @see #TABBED_PANE_SCROLL_BUTTONS_PLACEMENT
+	 */
+	String TABBED_PANE_PLACEMENT_TRAILING = "trailing";
+
+	/**
+	 * Specifies the alignment of the tab area.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JTabbedPane}<br>
+	 * <strong>Value type</strong> {@link java.lang.Integer} or {@link java.lang.String}<br>
+	 * <strong>Allowed Values</strong>
+	 *     {@link SwingConstants#LEADING} (default)
+	 *     {@link SwingConstants#TRAILING},
+	 *     {@link SwingConstants#CENTER},
+	 *     {@link #TABBED_PANE_ALIGN_LEADING} (default),
+	 *     {@link #TABBED_PANE_ALIGN_TRAILING},
+	 *     {@link #TABBED_PANE_ALIGN_CENTER} or
+	 *     {@link #TABBED_PANE_ALIGN_FILL}
+	 */
+	String TABBED_PANE_TAB_AREA_ALIGNMENT = "JTabbedPane.tabAreaAlignment";
+
+	/**
+	 * Specifies the horizontal alignment of the tab title and icon.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JTabbedPane}
+	 * or tab content components (see {@link javax.swing.JTabbedPane#setComponentAt(int, java.awt.Component)})<br>
+	 * <strong>Value type</strong> {@link java.lang.Integer} or {@link java.lang.String}<br>
+	 * <strong>Allowed Values</strong>
+	 *     {@link SwingConstants#LEADING},
+	 *     {@link SwingConstants#TRAILING},
+	 *     {@link SwingConstants#CENTER} (default),
+	 *     {@link #TABBED_PANE_ALIGN_LEADING},
+	 *     {@link #TABBED_PANE_ALIGN_TRAILING} or
+	 *     {@link #TABBED_PANE_ALIGN_CENTER} (default)
+	 */
+	String TABBED_PANE_TAB_ALIGNMENT = "JTabbedPane.tabAlignment";
+
+	/**
+	 * Align to the leading edge.
+	 *
+	 * @see #TABBED_PANE_TAB_AREA_ALIGNMENT
+	 * @see #TABBED_PANE_TAB_ALIGNMENT
+	 */
+	String TABBED_PANE_ALIGN_LEADING = "leading";
+
+	/**
+	 * Align to the trailing edge.
+	 *
+	 * @see #TABBED_PANE_TAB_AREA_ALIGNMENT
+	 * @see #TABBED_PANE_TAB_ALIGNMENT
+	 */
+	String TABBED_PANE_ALIGN_TRAILING = "trailing";
+
+	/**
+	 * Align to center.
+	 *
+	 * @see #TABBED_PANE_TAB_AREA_ALIGNMENT
+	 * @see #TABBED_PANE_TAB_ALIGNMENT
+	 */
+	String TABBED_PANE_ALIGN_CENTER = "center";
+
+	/**
+	 * Stretch to fill all available space.
+	 *
+	 * @see #TABBED_PANE_TAB_AREA_ALIGNMENT
+	 */
+	String TABBED_PANE_ALIGN_FILL = "fill";
+
+	/**
+	 * Specifies how the tabs should be sized.
+	 * <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_WIDTH_MODE_PREFERRED} (default),
+	 *     {@link #TABBED_PANE_TAB_WIDTH_MODE_EQUAL} or
+	 *     {@link #TABBED_PANE_TAB_WIDTH_MODE_COMPACT}
+	 */
+	String TABBED_PANE_TAB_WIDTH_MODE = "JTabbedPane.tabWidthMode";
+
+	/**
+	 * Tab width is adjusted to tab icon and title.
+	 *
+	 * @see #TABBED_PANE_TAB_WIDTH_MODE
+	 */
+	String TABBED_PANE_TAB_WIDTH_MODE_PREFERRED = "preferred";
+
+	/**
+	 * All tabs in a tabbed pane has same width.
+	 *
+	 * @see #TABBED_PANE_TAB_WIDTH_MODE
+	 */
+	String TABBED_PANE_TAB_WIDTH_MODE_EQUAL = "equal";
+
+	/**
+	 * Unselected tabs are smaller because they show only the tab icon, but no tab title.
+	 * Selected tabs show both.
+	 *
+	 * @see #TABBED_PANE_TAB_WIDTH_MODE
+	 */
+	String TABBED_PANE_TAB_WIDTH_MODE_COMPACT = "compact";
+
+	/**
+	 * Specifies the tab icon placement (relative to tab title).
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JTabbedPane}<br>
+	 * <strong>Value type</strong> {@link java.lang.Integer}<br>
+	 * <strong>Allowed Values</strong>
+	 *     {@link SwingConstants#LEADING} (default),
+	 *     {@link SwingConstants#TRAILING},
+	 *     {@link SwingConstants#TOP} or
+	 *     {@link SwingConstants#BOTTOM}
+	 */
+	String TABBED_PANE_TAB_ICON_PLACEMENT = "JTabbedPane.tabIconPlacement";
+
+	/**
+	 * 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
+	 * the preferred component width and the tab area height.<br>
+	 * For left and right tab placement, the layed out component size will be
+	 * the tab area width and the preferred component height.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JTabbedPane}<br>
+	 * <strong>Value type</strong> {@link java.awt.Component}
+	 */
+	String TABBED_PANE_LEADING_COMPONENT = "JTabbedPane.leadingComponent";
+
+	/**
+	 * 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
+	 * 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
+	 * the tab area width and the available vertical space (minimum is preferred component height).
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JTabbedPane}<br>
+	 * <strong>Value type</strong> {@link java.awt.Component}
+	 */
+	String TABBED_PANE_TRAILING_COMPONENT = "JTabbedPane.trailingComponent";
+
+	//---- JTextField ---------------------------------------------------------
+
 	/**
 	 * Specifies whether all text is selected when the text component gains focus.
 	 * <p>
 	 * <strong>Component</strong> {@link javax.swing.JTextField} (and subclasses)<br>
 	 * <strong>Value type</strong> {@link java.lang.String}<br>
-	 * <strong>Allowed Values</strong> {@link #SELECT_ALL_ON_FOCUS_POLICY_NEVER},
-	 * {@link #SELECT_ALL_ON_FOCUS_POLICY_ONCE} (default) or
-	 * {@link #SELECT_ALL_ON_FOCUS_POLICY_ALWAYS}
+	 * <strong>Allowed Values</strong>
+	 *     {@link #SELECT_ALL_ON_FOCUS_POLICY_NEVER},
+	 *     {@link #SELECT_ALL_ON_FOCUS_POLICY_ONCE} (default) or
+	 *     {@link #SELECT_ALL_ON_FOCUS_POLICY_ALWAYS}
 	 */
 	String SELECT_ALL_ON_FOCUS_POLICY = "JTextField.selectAllOnFocusPolicy";
 
@@ -183,6 +644,8 @@ public interface FlatClientProperties
 	 */
 	String PLACEHOLDER_TEXT = "JTextField.placeholderText";
 
+	//---- JToggleButton ------------------------------------------------------
+
 	/**
 	 * Height of underline if toggle button type is {@link #BUTTON_TYPE_TAB}.
 	 * <p>
@@ -207,6 +670,8 @@ public interface FlatClientProperties
 	 */
 	String TAB_BUTTON_SELECTED_BACKGROUND = "JToggleButton.tab.selectedBackground";
 
+	//---- helper methods -----------------------------------------------------
+
 	/**
 	 * Checks whether a client property of a component has the given value.
 	 */
@@ -223,6 +688,15 @@ public interface FlatClientProperties
 		return (value instanceof Boolean) ? (boolean) value : defaultValue;
 	}
 
+	/**
+	 * Checks whether a client property of a component is a {@link Boolean} and returns its value.
+	 * 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;
+	}
+
 	/**
 	 * Checks whether a client property of a component is an integer and returns its value.
 	 * If the client property is not set, or not an integer, defaultValue is returned.

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

@@ -18,25 +18,32 @@ package com.formdev.flatlaf;
 
 /**
  * A Flat LaF that has a dark color scheme and looks like Darcula LaF.
- *
- * The UI defaults are loaded from FlatDarculaLaf.properties, FlatDarkLaf.properties and FlatLaf.properties
+ * <p>
+ * The UI defaults are loaded from {@code FlatDarculaLaf.properties},
+ * {@code FlatDarkLaf.properties} and {@code FlatLaf.properties}.
  *
  * @author Karl Tauber
  */
 public class FlatDarculaLaf
 	extends FlatDarkLaf
 {
-	public static boolean install( ) {
+	public static final String NAME = "FlatLaf Darcula";
+
+	public static boolean install() {
 		return install( new FlatDarculaLaf() );
 	}
 
+	public static void installLafInfo() {
+		installLafInfo( NAME, FlatDarculaLaf.class );
+	}
+
 	@Override
 	public String getName() {
-		return "Flat Darcula";
+		return NAME;
 	}
 
 	@Override
 	public String getDescription() {
-		return "Flat Darcula Look and Feel";
+		return "FlatLaf Darcula Look and Feel";
 	}
 }

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

@@ -16,28 +16,46 @@
 
 package com.formdev.flatlaf;
 
+import javax.swing.UIManager;
+
 /**
  * A Flat LaF that has a dark color scheme.
- *
- * The UI defaults are loaded from FlatDarkLaf.properties and FlatLaf.properties
+ * <p>
+ * The UI defaults are loaded from {@code FlatDarkLaf.properties} and {@code FlatLaf.properties}.
  *
  * @author Karl Tauber
  */
 public class FlatDarkLaf
 	extends FlatLaf
 {
-	public static boolean install( ) {
+	public static final String NAME = "FlatLaf Dark";
+
+	/**
+	 * Sets the application look and feel to this LaF
+	 * using {@link UIManager#setLookAndFeel(javax.swing.LookAndFeel)}.
+	 */
+	public static boolean install() {
 		return install( new FlatDarkLaf() );
 	}
 
+	/**
+	 * 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, FlatDarkLaf.class );
+	}
+
 	@Override
 	public String getName() {
-		return "Flat Dark";
+		return NAME;
 	}
 
 	@Override
 	public String getDescription() {
-		return "Flat Dark Look and Feel";
+		return "FlatLaf Dark Look and Feel";
 	}
 
 	@Override

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

@@ -17,6 +17,8 @@
 package com.formdev.flatlaf;
 
 import java.io.InputStream;
+import javax.swing.LookAndFeel;
+import javax.swing.UIDefaults;
 
 /**
  * Addon for FlatLaf UI defaults.
@@ -50,6 +52,13 @@ public abstract class FlatDefaultsAddon
 		return addonClass.getResourceAsStream( propertiesName );
 	}
 
+	/**
+	 * Allows modifying UI defaults after loading UI defaults.
+	 * The default implementation does nothing.
+	 */
+	public void afterDefaultsLoading( LookAndFeel laf, UIDefaults defaults ) {
+	}
+
 	/**
 	 * Returns the priority used to sort addon loading.
 	 * The order is only important if you want overwrite UI defaults of other addons.

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

@@ -0,0 +1,89 @@
+/*
+ * Copyright 2020 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;
+
+/**
+ * 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
+ * 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.
+ * <p>
+ * Use the {@code *_DARK} colors only in {@code *_dark.svg} files.
+ * <p>
+ * The colors are based on IntelliJ Platform
+ *   <a href="https://jetbrains.design/intellij/principles/icons/#action-icons">Action icons</a>
+ * and
+ *   <a href="https://jetbrains.design/intellij/principles/icons/#noun-icons">Noun icons</a>
+ * <p>
+ * These colors may be changed by IntelliJ Platform themes.
+ * <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 )}.
+ *
+ * @author Karl Tauber
+ */
+public enum FlatIconColors
+{
+	// colors for action icons
+	// see https://jetbrains.design/intellij/principles/icons/#action-icons
+	ACTIONS_RED				( 0xDB5860, "Actions.Red", true, false ),
+	ACTIONS_RED_DARK		( 0xC75450, "Actions.Red", false, true ),
+	ACTIONS_YELLOW			( 0xEDA200, "Actions.Yellow", true, false ),
+	ACTIONS_YELLOW_DARK		( 0xF0A732, "Actions.Yellow", false, true ),
+	ACTIONS_GREEN			( 0x59A869, "Actions.Green", true, false ),
+	ACTIONS_GREEN_DARK		( 0x499C54, "Actions.Green", false, true ),
+	ACTIONS_BLUE			( 0x389FD6, "Actions.Blue", true, false ),
+	ACTIONS_BLUE_DARK		( 0x3592C4, "Actions.Blue", false, true ),
+	ACTIONS_GREY			( 0x6E6E6E, "Actions.Grey", true, false ),
+	ACTIONS_GREY_DARK		( 0xAFB1B3, "Actions.Grey", false, true ),
+	ACTIONS_GREYINLINE		( 0x7F8B91, "Actions.GreyInline", true, false ),
+	ACTIONS_GREYINLINE_DARK	( 0x7F8B91, "Actions.GreyInline", false, true ),
+
+	// colors for object icons
+	// see https://jetbrains.design/intellij/principles/icons/#noun-icons
+	OBJECTS_GREY			( 0x9AA7B0, "Objects.Grey" ),
+	OBJECTS_BLUE			( 0x40B6E0, "Objects.Blue" ),
+	OBJECTS_GREEN			( 0x62B543, "Objects.Green" ),
+	OBJECTS_YELLOW			( 0xF4AF3D, "Objects.Yellow" ),
+	OBJECTS_YELLOW_DARK		( 0xD9A343, "Objects.YellowDark" ),
+	OBJECTS_PURPLE			( 0xB99BF8, "Objects.Purple" ),
+	OBJECTS_PINK			( 0xF98B9E, "Objects.Pink" ),
+	OBJECTS_RED				( 0xF26522, "Objects.Red" ),
+	OBJECTS_RED_STATUS		( 0xE05555, "Objects.RedStatus" ),
+	OBJECTS_GREEN_ANDROID	( 0xA4C639, "Objects.GreenAndroid" ),
+	OBJECTS_BLACK_TEXT		( 0x231F20, "Objects.BlackText" );
+
+	public final int rgb;
+	public final String key;
+
+	public final boolean light;
+	public final boolean dark;
+
+	FlatIconColors( int rgb, String key ) {
+		this( rgb, key, true, true );
+	}
+
+	FlatIconColors( int rgb, String key, boolean light, boolean dark ) {
+		this.rgb = rgb;
+		this.key = key;
+		this.light = light;
+		this.dark = dark;
+	}
+}

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

@@ -22,9 +22,11 @@ import javax.swing.KeyStroke;
 import javax.swing.LookAndFeel;
 import javax.swing.UIDefaults;
 import javax.swing.UIDefaults.LazyValue;
+import javax.swing.UIManager;
 import javax.swing.plaf.InputMapUIResource;
 import com.formdev.flatlaf.util.SystemInfo;
 import static javax.swing.text.DefaultEditorKit.*;
+import java.util.function.BooleanSupplier;
 
 /**
  * @author Karl Tauber
@@ -35,7 +37,7 @@ class FlatInputMaps
 		initBasicInputMaps( defaults );
 		initTextComponentInputMaps( defaults );
 
-		if( SystemInfo.IS_MAC )
+		if( SystemInfo.isMacOS )
 			initMacInputMaps( defaults );
 	}
 
@@ -59,7 +61,7 @@ class FlatInputMaps
 			mac( "alt KP_DOWN", null ), "togglePopup"
 		);
 
-		if( !SystemInfo.IS_MAC ) {
+		if( !SystemInfo.isMacOS ) {
 			modifyInputMap( defaults, "FileChooser.ancestorInputMap",
 				"F2", "editFileName",
 				"BACK_SPACE", "Go Up"
@@ -81,15 +83,22 @@ class FlatInputMaps
 			"shift ctrl TAB", "navigatePrevious"
 		);
 
-		modifyInputMap( defaults, "Table.ancestorInputMap",
-			// swap to make it consistent with List and Tree
+		// swap Home/End with Ctrl+Home/End to make it consistent with List and Tree
+		modifyInputMap( () -> {
+				return UIManager.getBoolean( "Table.consistentHomeEndKeyBehavior" );
+			},
+			defaults, "Table.ancestorInputMap",
 			"HOME", "selectFirstRow",
 			"END", "selectLastRow",
+			"shift HOME", "selectFirstRowExtendSelection",
+			"shift END", "selectLastRowExtendSelection",
 			mac( "ctrl HOME", null ), "selectFirstColumn",
-			mac( "ctrl END", null ), "selectLastColumn"
+			mac( "ctrl END", null ), "selectLastColumn",
+			mac( "shift ctrl HOME", null ), "selectFirstColumnExtendSelection",
+			mac( "shift ctrl END", null ), "selectLastColumnExtendSelection"
 		);
 
-		if( !SystemInfo.IS_MAC ) {
+		if( !SystemInfo.isMacOS ) {
 			modifyInputMap( defaults, "Tree.focusInputMap",
 				"ADD", "expand",
 				"SUBTRACT", "collapse"
@@ -160,7 +169,7 @@ class FlatInputMaps
 			"control shift O", "toggle-componentOrientation", // DefaultEditorKit.toggleComponentOrientation
 		};
 
-		Object[] macCommonTextComponentBindings = SystemInfo.IS_MAC ? new Object[] {
+		Object[] macCommonTextComponentBindings = SystemInfo.isMacOS ? new Object[] {
 			// move caret one character (without selecting text)
 			"ctrl B", backwardAction,
 			"ctrl F", forwardAction,
@@ -207,7 +216,7 @@ class FlatInputMaps
 			"ENTER", JTextField.notifyAction,
 		};
 
-		Object[] macSingleLineTextComponentBindings = SystemInfo.IS_MAC ? new Object[] {
+		Object[] macSingleLineTextComponentBindings = SystemInfo.isMacOS ? new Object[] {
 			// move caret to line begin/end (without selecting text)
 			"UP", beginLineAction,
 			"DOWN", endLineAction,
@@ -285,7 +294,7 @@ class FlatInputMaps
 			mac( "ctrl SPACE", "meta SPACE" ), "activate-link-action",
 		};
 
-		Object[] macMultiLineTextComponentBindings = SystemInfo.IS_MAC ? new Object[] {
+		Object[] macMultiLineTextComponentBindings = SystemInfo.isMacOS ? new Object[] {
 			// move caret one line (without selecting text)
 			"ctrl N", downAction,
 			"ctrl P", upAction,
@@ -501,6 +510,9 @@ class FlatInputMaps
 			"alt KP_LEFT", "selectParent",
 			"alt KP_RIGHT", "selectChild",
 
+			"shift HOME", "selectFirstExtendSelection",
+			"shift END", "selectLastExtendSelection",
+
 		    "meta A", "selectAll",
 		    "meta C", "copy",
 		    "meta V", "paste",
@@ -545,8 +557,6 @@ class FlatInputMaps
 			"shift ctrl SPACE", null,
 			"shift ctrl UP", null,
 			"shift DELETE", null,
-			"shift END", null,
-			"shift HOME", null,
 			"shift INSERT", null,
 			"shift PAGE_DOWN", null,
 			"shift PAGE_UP", null,
@@ -569,12 +579,16 @@ class FlatInputMaps
 	}
 
 	private static void modifyInputMap( UIDefaults defaults, String key, Object... bindings ) {
-		// Note: not using `defaults.get(key)` here because this would resolve the lazy value
-		defaults.put( key, new LazyModifyInputMap( defaults.remove( key ), bindings ) );
+		modifyInputMap( null, defaults, key, bindings );
+	}
+
+	private static void modifyInputMap( BooleanSupplier condition, UIDefaults defaults, String key, Object... bindings ) {
+		// Note: not using `defaults.get(key)` here because this would resolve a lazy value
+		defaults.put( key, new LazyModifyInputMap( condition, defaults.remove( key ), bindings ) );
 	}
 
 	private static <T> T mac( T value, T macValue ) {
-		return SystemInfo.IS_MAC ? macValue : value;
+		return SystemInfo.isMacOS ? macValue : value;
 	}
 
 	//---- class LazyInputMapEx -----------------------------------------------
@@ -609,10 +623,12 @@ class FlatInputMaps
 	private static class LazyModifyInputMap
 		implements LazyValue
 	{
+		private final BooleanSupplier condition;
 		private final Object baseInputMap;
 		private final Object[] bindings;
 
-		LazyModifyInputMap( Object baseInputMap, Object[] bindings ) {
+		LazyModifyInputMap( BooleanSupplier condition, Object baseInputMap, Object[] bindings ) {
+			this.condition = condition;
 			this.baseInputMap = baseInputMap;
 			this.bindings = bindings;
 		}
@@ -624,6 +640,9 @@ class FlatInputMaps
 				? (InputMap) ((LazyValue)baseInputMap).createValue( table )
 				: (InputMap) baseInputMap;
 
+			if( condition != null && !condition.getAsBoolean() )
+				return inputMap;
+
 			// modify input map (replace or remove)
 			for( int i = 0; i < bindings.length; i += 2 ) {
 				KeyStroke keyStroke = KeyStroke.getKeyStroke( (String) bindings[i] );

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

@@ -18,25 +18,32 @@ package com.formdev.flatlaf;
 
 /**
  * A Flat LaF that has a light color scheme and looks like IntelliJ LaF.
- *
- * The UI defaults are loaded from FlatIntelliJLaf.properties, FlatLightLaf.properties and FlatLaf.properties
+ * <p>
+ * The UI defaults are loaded from {@code FlatIntelliJLaf.properties},
+ * {@code FlatLightLaf.properties} and {@code FlatLaf.properties}.
  *
  * @author Karl Tauber
  */
 public class FlatIntelliJLaf
 	extends FlatLightLaf
 {
-	public static boolean install( ) {
+	public static final String NAME = "FlatLaf IntelliJ";
+
+	public static boolean install() {
 		return install( new FlatIntelliJLaf() );
 	}
 
+	public static void installLafInfo() {
+		installLafInfo( NAME, FlatIntelliJLaf.class );
+	}
+
 	@Override
 	public String getName() {
-		return "Flat IntelliJ";
+		return NAME;
 	}
 
 	@Override
 	public String getDescription() {
-		return "Flat IntelliJ Look and Feel";
+		return "FlatLaf IntelliJ Look and Feel";
 	}
 }

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

@@ -18,38 +18,51 @@ package com.formdev.flatlaf;
 
 import java.awt.Color;
 import java.awt.Component;
-import java.awt.Container;
 import java.awt.EventQueue;
 import java.awt.Font;
-import java.awt.KeyEventPostProcessor;
-import java.awt.KeyboardFocusManager;
+import java.awt.Image;
 import java.awt.RenderingHints;
 import java.awt.Toolkit;
 import java.awt.Window;
-import java.awt.event.KeyEvent;
+import java.awt.image.FilteredImageSource;
+import java.awt.image.ImageFilter;
+import java.awt.image.ImageProducer;
 import java.beans.PropertyChangeEvent;
 import java.beans.PropertyChangeListener;
-import java.lang.ref.WeakReference;
+import java.io.File;
 import java.lang.reflect.Method;
+import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
+import java.util.Properties;
+import java.util.ServiceLoader;
 import java.util.function.Consumer;
+import java.util.function.Function;
 import java.util.logging.Level;
 import java.util.logging.Logger;
-import javax.swing.AbstractButton;
-import javax.swing.JLabel;
-import javax.swing.JRootPane;
-import javax.swing.JTabbedPane;
+import javax.swing.BorderFactory;
+import javax.swing.Icon;
+import javax.swing.ImageIcon;
+import javax.swing.JComponent;
+import javax.swing.JDialog;
+import javax.swing.JFrame;
 import javax.swing.LookAndFeel;
 import javax.swing.PopupFactory;
 import javax.swing.SwingUtilities;
 import javax.swing.UIDefaults;
+import javax.swing.UIDefaults.ActiveValue;
 import javax.swing.UIManager;
 import javax.swing.UnsupportedLookAndFeelException;
 import javax.swing.plaf.ColorUIResource;
 import javax.swing.plaf.FontUIResource;
+import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicLookAndFeel;
+import javax.swing.text.StyleContext;
 import javax.swing.text.html.HTMLEditorKit;
+import com.formdev.flatlaf.ui.FlatPopupFactory;
+import com.formdev.flatlaf.ui.JBRCustomDecorations;
+import com.formdev.flatlaf.util.GrayFilter;
+import com.formdev.flatlaf.util.MultiResolutionImageSupport;
 import com.formdev.flatlaf.util.SystemInfo;
 import com.formdev.flatlaf.util.UIScale;
 
@@ -64,18 +77,27 @@ public abstract class FlatLaf
 	static final Logger LOG = Logger.getLogger( FlatLaf.class.getName() );
 	private static final String DESKTOPFONTHINTS = "awt.font.desktophints";
 
+	private static List<Object> customDefaultsSources;
+
 	private String desktopPropertyName;
+	private String desktopPropertyName2;
 	private PropertyChangeListener desktopPropertyListener;
 
 	private static boolean aquaLoaded;
 	private static boolean updateUIPending;
 
-	private KeyEventPostProcessor mnemonicListener;
-	private static boolean showMnemonics;
-	private static WeakReference<Window> lastShowMnemonicWindow;
+	private PopupFactory oldPopupFactory;
+	private MnemonicHandler mnemonicHandler;
 
 	private Consumer<UIDefaults> postInitialization;
 
+	private Boolean oldFrameWindowDecorated;
+	private Boolean oldDialogWindowDecorated;
+
+	/**
+	 * Sets the application look and feel to the given LaF
+	 * using {@link UIManager#setLookAndFeel(javax.swing.LookAndFeel)}.
+	 */
 	public static boolean install( LookAndFeel newLookAndFeel ) {
 		try {
 			UIManager.setLookAndFeel( newLookAndFeel );
@@ -86,6 +108,16 @@ public abstract class FlatLaf
 		}
 	}
 
+	/**
+	 * Adds the given 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( String lafName, Class<? extends LookAndFeel> lafClass ) {
+		UIManager.installLookAndFeel( new UIManager.LookAndFeelInfo( lafName, lafClass.getName() ) );
+	}
+
 	/**
 	 * Returns the look and feel identifier.
 	 * <p>
@@ -101,6 +133,45 @@ public abstract class FlatLaf
 
 	public abstract boolean isDark();
 
+	/**
+	 * Checks whether the current look and feel is dark.
+	 */
+	public static boolean isLafDark() {
+		LookAndFeel lookAndFeel = UIManager.getLookAndFeel();
+		return lookAndFeel instanceof FlatLaf && ((FlatLaf)lookAndFeel).isDark();
+	}
+
+	/**
+	 * Returns whether FlatLaf supports custom window decorations.
+	 * This depends on the operating system and on the used Java runtime.
+	 * <p>
+	 * To use custom window decorations in your application, enable them with
+	 * following code (before creating any frames or dialogs). Then custom window
+	 * decorations are only enabled if this method returns {@code true}.
+	 * <pre>
+	 * JFrame.setDefaultLookAndFeelDecorated( true );
+	 * JDialog.setDefaultLookAndFeelDecorated( true );
+	 * </pre>
+	 * <p>
+	 * Returns {@code true} on Windows 10, {@code false} otherwise.
+	 * <p>
+	 * Return also {@code false} if running on Windows 10 in
+	 * <a href="https://confluence.jetbrains.com/display/JBR/JetBrains+Runtime">JetBrains Runtime 11 (or later)</a>
+	 * (<a href="https://github.com/JetBrains/JetBrainsRuntime">source code on github</a>)
+	 * and JBR supports custom window decorations. In this case, JBR custom decorations
+	 * are enabled if {@link JFrame#isDefaultLookAndFeelDecorated()} or
+	 * {@link JDialog#isDefaultLookAndFeelDecorated()} return {@code true}.
+	 */
+	@Override
+	public boolean getSupportsWindowDecorations() {
+		if( SystemInfo.isJetBrainsJVM_11_orLater &&
+			SystemInfo.isWindows_10_orLater &&
+			JBRCustomDecorations.isSupported() )
+		  return false;
+
+		return SystemInfo.isWindows_10_orLater;
+	}
+
 	@Override
 	public boolean isNativeLookAndFeel() {
 		return false;
@@ -111,35 +182,63 @@ public abstract class FlatLaf
 		return true;
 	}
 
+	@Override
+	public Icon getDisabledIcon( JComponent component, Icon icon ) {
+		if( icon instanceof DisabledIconProvider )
+			return ((DisabledIconProvider)icon).getDisabledIcon();
+
+		if( icon instanceof ImageIcon ) {
+			Object grayFilter = UIManager.get( "Component.grayFilter" );
+			ImageFilter filter = (grayFilter instanceof ImageFilter)
+				? (ImageFilter) grayFilter
+				: GrayFilter.createDisabledIconFilter( isDark() ); // fallback
+
+			Function<Image, Image> mapper = img -> {
+				ImageProducer producer = new FilteredImageSource( img.getSource(), filter );
+				return Toolkit.getDefaultToolkit().createImage( producer );
+			};
+
+			Image image = ((ImageIcon)icon).getImage();
+			return new ImageIconUIResource( MultiResolutionImageSupport.map( image, mapper ) );
+		}
+
+		return null;
+	}
+
 	@Override
 	public void initialize() {
-		if( SystemInfo.IS_MAC )
+		if( SystemInfo.isMacOS )
 			initializeAqua();
 
 		super.initialize();
 
-		// add mnemonic listener
-		mnemonicListener = e -> {
-			checkShowMnemonics( e );
-			return false;
-		};
-		KeyboardFocusManager.getCurrentKeyboardFocusManager().addKeyEventPostProcessor( mnemonicListener );
+		// install popup factory
+		oldPopupFactory = PopupFactory.getSharedInstance();
+		PopupFactory.setSharedInstance( new FlatPopupFactory() );
+
+		// install mnemonic handler
+		mnemonicHandler = new MnemonicHandler();
+		mnemonicHandler.install();
 
 		// listen to desktop property changes to update UI if system font or scaling changes
-		if( SystemInfo.IS_WINDOWS ) {
+		if( SystemInfo.isWindows ) {
 			// Windows 10 allows increasing font size independent of scaling:
 			//   Settings > Ease of Access > Display > Make text bigger (100% - 225%)
 			desktopPropertyName = "win.messagebox.font";
-		} else if( SystemInfo.IS_LINUX ) {
+		} else if( SystemInfo.isLinux ) {
+			// Linux/Gnome allows changing font in "Tweaks" app
+			desktopPropertyName = "gnome.Gtk/FontName";
+
 			// Linux/Gnome allows extra scaling and larger text:
 			//   Settings > Devices > Displays > Scale (100% or 200%)
 			//   Settings > Universal access > Large Text (off or on, 125%)
-			desktopPropertyName = "gnome.Xft/DPI";
+			//   "Tweaks" app > Fonts > Scaling Factor (0,5 - 3)
+			desktopPropertyName2 = "gnome.Xft/DPI";
 		}
 		if( desktopPropertyName != null ) {
 			desktopPropertyListener = e -> {
 				String propertyName = e.getPropertyName();
-				if( desktopPropertyName.equals( propertyName ) )
+				if( desktopPropertyName.equals( propertyName ) || propertyName.equals( desktopPropertyName2 ) )
 					reSetLookAndFeel();
 				else if( DESKTOPFONTHINTS.equals( propertyName ) ) {
 					if( UIManager.getLookAndFeel() instanceof FlatLaf ) {
@@ -150,6 +249,8 @@ public abstract class FlatLaf
 			};
 			Toolkit toolkit = Toolkit.getDefaultToolkit();
 			toolkit.addPropertyChangeListener( desktopPropertyName, desktopPropertyListener );
+			if( desktopPropertyName2 != null )
+				toolkit.addPropertyChangeListener( desktopPropertyName2, desktopPropertyListener );
 			toolkit.addPropertyChangeListener( DESKTOPFONTHINTS, desktopPropertyListener );
 		}
 
@@ -164,6 +265,16 @@ public abstract class FlatLaf
 					String.format( "a { color: #%06x; }", linkColor.getRGB() & 0xffffff ) );
 			}
 		};
+
+		// enable/disable window decorations, but only if system property is either
+		// "true" or "false"; in other cases it is not changed
+		Boolean useWindowDecorations = FlatSystemProperties.getBooleanStrict( FlatSystemProperties.USE_WINDOW_DECORATIONS, null );
+		if( useWindowDecorations != null ) {
+			oldFrameWindowDecorated = JFrame.isDefaultLookAndFeelDecorated();
+			oldDialogWindowDecorated = JDialog.isDefaultLookAndFeelDecorated();
+			JFrame.setDefaultLookAndFeelDecorated( useWindowDecorations );
+			JDialog.setDefaultLookAndFeelDecorated( useWindowDecorations );
+		}
 	}
 
 	@Override
@@ -172,21 +283,38 @@ public abstract class FlatLaf
 		if( desktopPropertyListener != null ) {
 			Toolkit toolkit = Toolkit.getDefaultToolkit();
 			toolkit.removePropertyChangeListener( desktopPropertyName, desktopPropertyListener );
+			if( desktopPropertyName2 != null )
+				toolkit.removePropertyChangeListener( desktopPropertyName2, desktopPropertyListener );
 			toolkit.removePropertyChangeListener( DESKTOPFONTHINTS, desktopPropertyListener );
 			desktopPropertyName = null;
+			desktopPropertyName2 = null;
 			desktopPropertyListener = null;
 		}
 
-		// remove mnemonic listener
-		if( mnemonicListener != null ) {
-			KeyboardFocusManager.getCurrentKeyboardFocusManager().removeKeyEventPostProcessor( mnemonicListener );
-			mnemonicListener = null;
+		// uninstall popup factory
+		if( oldPopupFactory != null ) {
+			PopupFactory.setSharedInstance( oldPopupFactory );
+			oldPopupFactory = null;
+		}
+
+		// uninstall mnemonic handler
+		if( mnemonicHandler != null ) {
+			mnemonicHandler.uninstall();
+			mnemonicHandler = null;
 		}
 
 		// restore default link color
 		new HTMLEditorKit().getStyleSheet().addRule( "a { color: blue; }" );
 		postInitialization = null;
 
+		// restore enable/disable window decorations
+		if( oldFrameWindowDecorated != null ) {
+			JFrame.setDefaultLookAndFeelDecorated( oldFrameWindowDecorated );
+			JDialog.setDefaultLookAndFeelDecorated( oldDialogWindowDecorated );
+			oldFrameWindowDecorated = null;
+			oldDialogWindowDecorated = null;
+		}
+
 		super.uninitialize();
 	}
 
@@ -207,7 +335,7 @@ public abstract class FlatLaf
 		String aquaLafClassName = "com.apple.laf.AquaLookAndFeel";
 		BasicLookAndFeel aquaLaf;
 		try {
-			if( SystemInfo.IS_JAVA_9_OR_LATER ) {
+			if( SystemInfo.isJava_9_orLater ) {
 				Method m = UIManager.class.getMethod( "createLookAndFeel", String.class );
 				aquaLaf = (BasicLookAndFeel) m.invoke( null, "Mac OS X" );
 			} else
@@ -233,12 +361,17 @@ public abstract class FlatLaf
 	public UIDefaults getDefaults() {
 		UIDefaults defaults = super.getDefaults();
 
-		// add Metal resource bundle, which is required for FlatFileChooserUI
-		defaults.addResourceBundle( "com.sun.swing.internal.plaf.metal.resources.metal" );
+		// add flag that indicates whether the LaF is light or dark
+		// (can be queried without using FlatLaf API)
+		defaults.put( "laf.dark", isDark() );
+
+		// add resource bundle for localized texts
+		defaults.addResourceBundle( "com.formdev.flatlaf.resources.Bundle" );
 
 		// initialize some defaults (for overriding) that are used in UI delegates,
 		// but are not set in BasicLookAndFeel
 		putDefaults( defaults, defaults.getColor( "control" ),
+			"Button.disabledBackground",
 			"EditorPane.disabledBackground",
 			"EditorPane.inactiveBackground",
 			"FormattedTextField.disabledBackground",
@@ -248,7 +381,8 @@ public abstract class FlatLaf
 			"TextArea.inactiveBackground",
 			"TextField.disabledBackground",
 			"TextPane.disabledBackground",
-			"TextPane.inactiveBackground" );
+			"TextPane.inactiveBackground",
+			"ToggleButton.disabledBackground" );
 		putDefaults( defaults, defaults.getColor( "textInactiveText" ),
 			"Button.disabledText",
 			"CheckBox.disabledText",
@@ -266,73 +400,121 @@ public abstract class FlatLaf
 		initIconColors( defaults, isDark() );
 		FlatInputMaps.initInputMaps( defaults );
 
+		// get addons and sort them by priority
+		ServiceLoader<FlatDefaultsAddon> addonLoader = ServiceLoader.load( FlatDefaultsAddon.class );
+		List<FlatDefaultsAddon> addons = new ArrayList<>();
+		for( FlatDefaultsAddon addon : addonLoader )
+			addons.add( addon );
+		addons.sort( (addon1, addon2) -> addon1.getPriority() - addon2.getPriority() );
+
 		// load defaults from properties
 		List<Class<?>> lafClassesForDefaultsLoading = getLafClassesForDefaultsLoading();
 		if( lafClassesForDefaultsLoading != null )
-			UIDefaultsLoader.loadDefaultsFromProperties( lafClassesForDefaultsLoading, defaults );
+			UIDefaultsLoader.loadDefaultsFromProperties( lafClassesForDefaultsLoading, addons, getAdditionalDefaults(), isDark(), defaults );
 		else
-			UIDefaultsLoader.loadDefaultsFromProperties( getClass(), defaults );
+			UIDefaultsLoader.loadDefaultsFromProperties( getClass(), addons, getAdditionalDefaults(), isDark(), defaults );
 
 		// use Aqua MenuBarUI if Mac screen menubar is enabled
-		if( SystemInfo.IS_MAC && Boolean.getBoolean( "apple.laf.useScreenMenuBar" ) )
+		if( SystemInfo.isMacOS && Boolean.getBoolean( "apple.laf.useScreenMenuBar" ) ) {
 			defaults.put( "MenuBarUI", "com.apple.laf.AquaMenuBarUI" );
 
+			// add defaults necessary for AquaMenuBarUI
+			defaults.put( "MenuBar.backgroundPainter", BorderFactory.createEmptyBorder() );
+		}
+
 		// initialize text antialiasing
 		putAATextInfo( defaults );
 
-		invokePostInitialization( defaults );
+		// apply additional defaults (e.g. from IntelliJ themes)
+		applyAdditionalDefaults( defaults );
 
-		return defaults;
-	}
+		// allow addons modifying UI defaults
+		for( FlatDefaultsAddon addon : addons )
+			addon.afterDefaultsLoading( this, defaults );
+
+		// add user scale factor to allow layout managers (e.g. MigLayout) to use it
+		defaults.put( "laf.scaleFactor", (ActiveValue) t -> {
+			return UIScale.getUserScaleFactor();
+		} );
 
-	void invokePostInitialization( UIDefaults defaults ) {
 		if( postInitialization != null ) {
 			postInitialization.accept( defaults );
 			postInitialization = null;
 		}
+
+		return defaults;
 	}
 
-	List<Class<?>> getLafClassesForDefaultsLoading() {
+	void applyAdditionalDefaults( UIDefaults defaults ) {
+	}
+
+	protected List<Class<?>> getLafClassesForDefaultsLoading() {
+		return null;
+	}
+
+	protected Properties getAdditionalDefaults() {
 		return null;
 	}
 
 	private void initFonts( UIDefaults defaults ) {
 		FontUIResource uiFont = null;
 
-		if( SystemInfo.IS_WINDOWS ) {
+		if( SystemInfo.isWindows ) {
 			Font winFont = (Font) Toolkit.getDefaultToolkit().getDesktopProperty( "win.messagebox.font" );
 			if( winFont != null )
-				uiFont = new FontUIResource( winFont );
+				uiFont = createCompositeFont( winFont.getFamily(), winFont.getStyle(), winFont.getSize() );
 
-		} else if( SystemInfo.IS_MAC ) {
+		} else if( SystemInfo.isMacOS ) {
 			String fontName;
-			if( SystemInfo.IS_MAC_OS_10_11_EL_CAPITAN_OR_LATER ) {
+			if( SystemInfo.isMacOS_10_15_Catalina_orLater ) {
+				// use Helvetica Neue font
+				fontName = "Helvetica Neue";
+			} else if( SystemInfo.isMacOS_10_11_ElCapitan_orLater ) {
 				// use San Francisco Text font
 				fontName = ".SF NS Text";
 			} else {
 				// default font on older systems (see com.apple.laf.AquaFonts)
 				fontName = "Lucida Grande";
 			}
-			uiFont = new FontUIResource( fontName, Font.PLAIN, 13 );
 
-		} else if( SystemInfo.IS_LINUX ) {
+			uiFont = createCompositeFont( fontName, Font.PLAIN, 13 );
+
+		} else if( SystemInfo.isLinux ) {
 			Font font = LinuxFontPolicy.getFont();
 			uiFont = (font instanceof FontUIResource) ? (FontUIResource) font : new FontUIResource( font );
 		}
 
+		// fallback
 		if( uiFont == null )
-			return;
+			uiFont = createCompositeFont( Font.SANS_SERIF, Font.PLAIN, 12 );
 
+		// increase font size if system property "flatlaf.uiScale" is set
 		uiFont = UIScale.applyCustomScaleFactor( uiFont );
 
+		// use active value for all fonts to allow changing fonts in all components
+		// (similar as in Nimbus L&F) with:
+		//     UIManager.put( "defaultFont", myFont );
+		Object activeFont =  new ActiveFont( 1 );
+
 		// override fonts
 		for( Object key : defaults.keySet() ) {
 			if( key instanceof String && (((String)key).endsWith( ".font" ) || ((String)key).endsWith( "Font" )) )
-				defaults.put( key, uiFont );
+				defaults.put( key, activeFont );
 		}
 
 		// use smaller font for progress bar
-		defaults.put( "ProgressBar.font", UIScale.scaleFont( uiFont, 0.85f ) );
+		defaults.put( "ProgressBar.font", new ActiveFont( 0.85f ) );
+
+		// set default font
+		defaults.put( "defaultFont", uiFont );
+	}
+
+	static FontUIResource createCompositeFont( String family, int style, int size ) {
+		// using StyleContext.getFont() here because it uses
+		// sun.font.FontUtilities.getCompositeFontUIResource()
+		// and creates a composite font that is able to display all Unicode characters
+		Font font = StyleContext.getDefaultStyleContext().getFont( family, style, size );
+		return (font instanceof FontUIResource) ? (FontUIResource) font : new FontUIResource( font );
 	}
 
 	/**
@@ -348,34 +530,18 @@ public abstract class FlatLaf
 	 *   <a href="https://jetbrains.design/intellij/principles/icons/#action-icons">Action icons</a>
 	 * and
 	 *   <a href="https://jetbrains.design/intellij/principles/icons/#noun-icons">Noun icons</a>
+	 * <p>
+	 * These colors may be changed by IntelliJ Platform themes.
 	 */
 	public static void initIconColors( UIDefaults defaults, boolean dark ) {
-		// colors for action icons
-		// see https://jetbrains.design/intellij/principles/icons/#action-icons
-		defaults.put( "Actions.Red",            new ColorUIResource( !dark ? 0xDB5860 : 0xC75450 ) );
-		defaults.put( "Actions.Yellow",         new ColorUIResource( !dark ? 0xEDA200 : 0xF0A732 ) );
-		defaults.put( "Actions.Green",          new ColorUIResource( !dark ? 0x59A869 : 0x499C54 ) );
-		defaults.put( "Actions.Blue",           new ColorUIResource( !dark ? 0x389FD6 : 0x3592C4 ) );
-		defaults.put( "Actions.Grey",           new ColorUIResource( !dark ? 0x6E6E6E : 0xAFB1B3 ) );
-		defaults.put( "Actions.GreyInline",     new ColorUIResource( !dark ? 0x7F8B91 : 0x7F8B91 ) );
-
-		// colors for object icons
-		// see https://jetbrains.design/intellij/principles/icons/#noun-icons
-		defaults.put( "Objects.Grey",           new ColorUIResource( 0x9AA7B0 ) );
-		defaults.put( "Objects.Blue",           new ColorUIResource( 0x40B6E0 ) );
-		defaults.put( "Objects.Green",          new ColorUIResource( 0x62B543 ) );
-		defaults.put( "Objects.Yellow",         new ColorUIResource( 0xF4AF3D ) );
-		defaults.put( "Objects.YellowDark",     new ColorUIResource( 0xD9A343 ) );
-		defaults.put( "Objects.Purple",         new ColorUIResource( 0xB99BF8 ) );
-		defaults.put( "Objects.Pink",           new ColorUIResource( 0xF98B9E ) );
-		defaults.put( "Objects.Red",            new ColorUIResource( 0xF26522 ) );
-		defaults.put( "Objects.RedStatus",      new ColorUIResource( 0xE05555 ) );
-		defaults.put( "Objects.GreenAndroid",   new ColorUIResource( 0xA4C639 ) );
-		defaults.put( "Objects.BlackText",      new ColorUIResource( 0x231F20 ) );
+		for( FlatIconColors c : FlatIconColors.values() ) {
+			if( c.light == !dark || c.dark == dark )
+				defaults.put( c.key, new ColorUIResource( c.rgb ) );
+		}
 	}
 
 	private void putAATextInfo( UIDefaults defaults ) {
-		if( SystemInfo.IS_JAVA_9_OR_LATER ) {
+		if( SystemInfo.isJava_9_orLater ) {
 			Object desktopHints = Toolkit.getDefaultToolkit().getDesktopProperty( DESKTOPFONTHINTS );
 			if( desktopHints instanceof Map ) {
 				@SuppressWarnings( "unchecked" )
@@ -412,6 +578,87 @@ public abstract class FlatLaf
 			defaults.put( key, value );
 	}
 
+	static List<Object> getCustomDefaultsSources() {
+		return customDefaultsSources;
+	}
+
+	/**
+	 * Registers a package where FlatLaf searches for properties files with custom UI defaults.
+	 * <p>
+	 * This can be used to specify application specific UI defaults that override UI values
+	 * of existing themes or to define own UI values used in custom controls.
+	 * <p>
+	 * There may be multiple properties files in that package for multiple themes.
+	 * The properties file name must match the used theme class names.
+	 * E.g. {@code FlatLightLaf.properties} for class {@link FlatLightLaf}
+	 * or {@code FlatDarkLaf.properties} for class {@link FlatDarkLaf}.
+	 * {@code FlatLaf.properties} is loaded first for all themes.
+	 * <p>
+	 * These properties files are loaded after theme and addon properties files
+	 * and can therefore override all UI defaults.
+	 * <p>
+	 * Invoke this method before setting the look and feel.
+	 *
+	 * @param packageName a package name (e.g. "com.myapp.resources")
+	 */
+	public static void registerCustomDefaultsSource( String packageName ) {
+		registerCustomDefaultsSource( packageName, null );
+	}
+
+	public static void unregisterCustomDefaultsSource( String packageName ) {
+		unregisterCustomDefaultsSource( packageName, null );
+	}
+
+	/**
+	 * Registers a package where FlatLaf searches for properties files with custom UI defaults.
+	 * <p>
+	 * See {@link #registerCustomDefaultsSource(String)} for details.
+	 *
+	 * @param packageName a package name (e.g. "com.myapp.resources")
+	 * @param classLoader a class loader used to find resources, or {@code null}
+	 */
+	public static void registerCustomDefaultsSource( String packageName, ClassLoader classLoader ) {
+		if( customDefaultsSources == null )
+			customDefaultsSources = new ArrayList<>();
+		customDefaultsSources.add( packageName );
+		customDefaultsSources.add( classLoader );
+	}
+
+	public static void unregisterCustomDefaultsSource( String packageName, ClassLoader classLoader ) {
+		if( customDefaultsSources == null )
+			return;
+
+		int size = customDefaultsSources.size();
+		for( int i = 0; i < size - 1; i++ ) {
+			Object source = customDefaultsSources.get( i );
+			if( packageName.equals( source ) && customDefaultsSources.get( i + 1 ) == classLoader ) {
+				customDefaultsSources.remove( i + 1 );
+				customDefaultsSources.remove( i );
+				break;
+			}
+		}
+	}
+
+	/**
+	 * Registers a folder where FlatLaf searches for properties files with custom UI defaults.
+	 * <p>
+	 * See {@link #registerCustomDefaultsSource(String)} for details.
+	 *
+	 * @param folder a folder
+	 */
+	public static void registerCustomDefaultsSource( File folder ) {
+		if( customDefaultsSources == null )
+			customDefaultsSources = new ArrayList<>();
+		customDefaultsSources.add( folder );
+	}
+
+	public static void unregisterCustomDefaultsSource( File folder ) {
+		if( customDefaultsSources == null )
+			return;
+
+		customDefaultsSources.remove( folder );
+	}
+
 	private static void reSetLookAndFeel() {
 		EventQueue.invokeLater( () -> {
 			LookAndFeel lookAndFeel = UIManager.getLookAndFeel();
@@ -461,85 +708,95 @@ public abstract class FlatLaf
 	}
 
 	public static boolean isShowMnemonics() {
-		return showMnemonics || !UIManager.getBoolean( "Component.hideMnemonics" );
+		return MnemonicHandler.isShowMnemonics();
 	}
 
-	private static void checkShowMnemonics( KeyEvent e ) {
-		int keyCode = e.getKeyCode();
-		if( SystemInfo.IS_MAC ) {
-			// Ctrl+Alt keys must be pressed on Mac
-			if( keyCode == KeyEvent.VK_CONTROL || keyCode == KeyEvent.VK_ALT )
-				showMnemonics( e.getID() == KeyEvent.KEY_PRESSED && e.isControlDown() && e.isAltDown(), e.getComponent() );
-		} else {
-			// Alt key must be pressed on Windows and Linux
-			if( keyCode == KeyEvent.VK_ALT )
-				showMnemonics( e.getID() == KeyEvent.KEY_PRESSED, e.getComponent() );
+	public static void showMnemonics( Component c ) {
+		MnemonicHandler.showMnemonics( true, c );
+	}
+
+	public static void hideMnemonics() {
+		MnemonicHandler.showMnemonics( false, null );
+	}
+
+	// do not allow overriding to avoid issues in FlatUIUtils.createSharedUI()
+	@Override
+	public final boolean equals( Object obj ) {
+		return super.equals( obj );
+	}
+
+	// do not allow overriding to avoid issues in FlatUIUtils.createSharedUI()
+	@Override
+	public final int hashCode() {
+		return super.hashCode();
+	}
+
+	//---- class ActiveFont ---------------------------------------------------
+
+	private static class ActiveFont
+		implements ActiveValue
+	{
+		private final float scaleFactor;
+
+		// cache (scaled) font
+		private Font font;
+		private Font lastDefaultFont;
+
+		ActiveFont( float scaleFactor ) {
+			this.scaleFactor = scaleFactor;
 		}
-	}
 
-	private static void showMnemonics( boolean show, Component c ) {
-		if( show == showMnemonics )
-			return;
+		@Override
+		public Object createValue( UIDefaults table ) {
+			Font defaultFont = UIManager.getFont( "defaultFont" );
 
-		showMnemonics = show;
+			if( lastDefaultFont != defaultFont ) {
+				lastDefaultFont = defaultFont;
 
-		// check whether it is necessary to repaint
-		if( !UIManager.getBoolean( "Component.hideMnemonics" ) )
-			return;
-
-		if( show ) {
-			// get root pane
-			JRootPane rootPane = SwingUtilities.getRootPane( c );
-			if( rootPane == null )
-				return;
-
-			// get window
-			Window window = SwingUtilities.getWindowAncestor( rootPane );
-			if( window == null )
-				return;
-
-			// repaint components with mnemonics in focused window
-			repaintMnemonics( window );
-
-			lastShowMnemonicWindow = new WeakReference<>( window );
-		} else if( lastShowMnemonicWindow != null ) {
-			Window window = lastShowMnemonicWindow.get();
-			if( window != null )
-				repaintMnemonics( window );
-
-			lastShowMnemonicWindow = null;
-		}
-	}
-
-	private static void repaintMnemonics( Container container ) {
-		for( Component c : container.getComponents() ) {
-			if( !c.isVisible() )
-				continue;
-
-			if( hasMnemonic( c ) )
-				c.repaint();
-
-			if( c instanceof Container )
-				repaintMnemonics( (Container) c );
-		}
-	}
-
-	private static boolean hasMnemonic( Component c ) {
-		if( c instanceof JLabel && ((JLabel)c).getDisplayedMnemonicIndex() >= 0 )
-			return true;
-
-		if( c instanceof AbstractButton && ((AbstractButton)c).getDisplayedMnemonicIndex() >= 0 )
-			return true;
-
-		if( c instanceof JTabbedPane ) {
-			JTabbedPane tabPane = (JTabbedPane) c;
-			int tabCount = tabPane.getTabCount();
-			for( int i = 0; i < tabCount; i++ ) {
-				if( tabPane.getDisplayedMnemonicIndexAt( i ) >= 0 )
-					return true;
+				if( scaleFactor != 1 ) {
+					// scale font
+					int newFontSize = Math.round( defaultFont.getSize() * scaleFactor );
+					font = new FontUIResource( defaultFont.deriveFont( (float) newFontSize ) );
+				} else {
+					// make sure that font is a UIResource for LaF switching
+					font = (defaultFont instanceof UIResource)
+						? defaultFont
+						: new FontUIResource( defaultFont );
+				}
 			}
-		}
 
-		return false;
+			return font;
+		}
+	}
+
+	//---- class ImageIconUIResource ------------------------------------------
+
+	private static class ImageIconUIResource
+		extends ImageIcon
+		implements UIResource
+	{
+		ImageIconUIResource( Image image ) {
+			super( image );
+		}
+	}
+
+	//---- interface DisabledIconProvider -------------------------------------
+
+	/**
+	 * A provider for disabled icons.
+	 * <p>
+	 * This is intended to be implemented by {@link javax.swing.Icon} implementations
+	 * that provide the ability to paint disabled state.
+	 * <p>
+	 * Used in {@link FlatLaf#getDisabledIcon(JComponent, Icon)} to create a disabled icon from an enabled icon.
+	 */
+	public interface DisabledIconProvider
+	{
+		/**
+		 * Returns an icon with a disabled appearance.
+		 *
+		 * @return a disabled icon
+		 */
+		Icon getDisabledIcon();
 	}
 }

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

@@ -16,28 +16,46 @@
 
 package com.formdev.flatlaf;
 
+import javax.swing.UIManager;
+
 /**
  * A Flat LaF that has a light color scheme.
- *
- * The UI defaults are loaded from FlatLightLaf.properties and FlatLaf.properties
+ * <p>
+ * The UI defaults are loaded from {@code FlatLightLaf.properties} and {@code FlatLaf.properties}.
  *
  * @author Karl Tauber
  */
 public class FlatLightLaf
 	extends FlatLaf
 {
-	public static boolean install( ) {
+	public static final String NAME = "FlatLaf Light";
+
+	/**
+	 * Sets the application look and feel to this LaF
+	 * using {@link UIManager#setLookAndFeel(javax.swing.LookAndFeel)}.
+	 */
+	public static boolean install() {
 		return install( new FlatLightLaf() );
 	}
 
+	/**
+	 * 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, FlatLightLaf.class );
+	}
+
 	@Override
 	public String getName() {
-		return "Flat Light";
+		return NAME;
 	}
 
 	@Override
 	public String getDescription() {
-		return "Flat Light Look and Feel";
+		return "FlatLaf Light Look and Feel";
 	}
 
 	@Override

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

@@ -0,0 +1,126 @@
+/*
+ * Copyright 2020 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.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.Properties;
+
+/**
+ * A Flat LaF that is able to load UI defaults from properties passed to the constructor.
+ * <p>
+ * Specify the base theme in the properties with {@code @baseTheme=<baseTheme>}.
+ * Allowed values for {@code <baseTheme>} are {@code light} (the default), {@code dark},
+ * {@code intellij} or {@code darcula}.
+ * <p>
+ * The properties are applied after loading the base theme and may overwrite base properties.
+ * All features of FlatLaf properties files are available.
+ *
+ * @author Karl Tauber
+ */
+public class FlatPropertiesLaf
+	extends FlatLaf
+{
+	private final String name;
+	private final String baseTheme;
+	private final boolean dark;
+	private final Properties properties;
+
+	public FlatPropertiesLaf( String name, File propertiesFile )
+		throws IOException
+	{
+		this( name, new FileInputStream( propertiesFile ) );
+	}
+
+	public FlatPropertiesLaf( String name, InputStream in )
+		throws IOException
+	{
+		this( name, loadProperties( in ) );
+	}
+
+	private static Properties loadProperties( InputStream in )
+		throws IOException
+	{
+		Properties properties = new Properties();
+		try( InputStream in2 = in ) {
+			properties.load( in2 );
+		}
+		return properties;
+	}
+
+	public FlatPropertiesLaf( String name, Properties properties ) {
+		this.name = name;
+		this.properties = properties;
+
+		baseTheme = properties.getProperty( "@baseTheme", "light" );
+		dark = "dark".equalsIgnoreCase( baseTheme ) || "darcula".equalsIgnoreCase( baseTheme );
+	}
+
+	@Override
+	public String getName() {
+		return name;
+	}
+
+	@Override
+	public String getDescription() {
+		return name;
+	}
+
+	@Override
+	public boolean isDark() {
+		return dark;
+	}
+
+	public Properties getProperties() {
+		return properties;
+	}
+
+	@Override
+	protected ArrayList<Class<?>> getLafClassesForDefaultsLoading() {
+		ArrayList<Class<?>> lafClasses = new ArrayList<>();
+		lafClasses.add( FlatLaf.class );
+		switch( baseTheme.toLowerCase() ) {
+			default:
+			case "light":
+				lafClasses.add( FlatLightLaf.class );
+				break;
+
+			case "dark":
+				lafClasses.add( FlatDarkLaf.class );
+				break;
+
+			case "intellij":
+				lafClasses.add( FlatLightLaf.class );
+				lafClasses.add( FlatIntelliJLaf.class );
+				break;
+
+			case "darcula":
+				lafClasses.add( FlatDarkLaf.class );
+				lafClasses.add( FlatDarculaLaf.class );
+				break;
+		}
+		return lafClasses;
+	}
+
+	@Override
+	protected Properties getAdditionalDefaults() {
+		return properties;
+	}
+}

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

@@ -0,0 +1,134 @@
+/*
+ * Copyright 2020 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 javax.swing.JDialog;
+import javax.swing.JFrame;
+
+/**
+ * Defines/documents own system properties used in FlatLaf.
+ *
+ * @author Karl Tauber
+ */
+public interface FlatSystemProperties
+{
+	/**
+	 * Specifies a custom scale factor used to scale the UI.
+	 * <p>
+	 * If Java runtime scales (Java 9 or later), this scale factor is applied on top
+	 * of the Java system scale factor. Java 8 does not scale and this scale factor
+	 * replaces the user scale factor that FlatLaf computes based on the font.
+	 * To replace the Java 9+ system scale factor, use system property "sun.java2d.uiScale",
+	 * which has the same syntax as this one.
+	 * <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";
+
+	/**
+	 * Specifies whether user scaling mode is enabled.
+	 * <p>
+	 * <strong>Allowed Values</strong> {@code false} and {@code true}<br>
+	 * <strong>Default</strong> {@code true}
+	 */
+	String UI_SCALE_ENABLED = "flatlaf.uiScale.enabled";
+
+	/**
+	 * Specifies whether Ubuntu font should be used on Ubuntu Linux.
+	 * By default, if not running in a JetBrains Runtime, the Liberation Sans font
+	 * is used because there are rendering issues (in Java) with Ubuntu fonts.
+	 * <p>
+	 * <strong>Allowed Values</strong> {@code false} and {@code true}<br>
+	 * <strong>Default</strong> {@code false}
+	 */
+	String USE_UBUNTU_FONT = "flatlaf.useUbuntuFont";
+
+	/**
+	 * Specifies whether custom look and feel window decorations should be used
+	 * when creating {@code JFrame} or {@code JDialog}.
+	 * <p>
+	 * If this system property is set, FlatLaf invokes {@link JFrame#setDefaultLookAndFeelDecorated(boolean)}
+	 * and {@link JDialog#setDefaultLookAndFeelDecorated(boolean)} on LaF initialization.
+	 * <p>
+	 * <strong>Allowed Values</strong> {@code false} and {@code true}<br>
+	 * <strong>Default</strong> none
+	 */
+	String USE_WINDOW_DECORATIONS = "flatlaf.useWindowDecorations";
+
+	/**
+	 * 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>
+	 * (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>
+	 * <strong>Allowed Values</strong> {@code false} and {@code true}<br>
+	 * <strong>Default</strong> {@code true}
+	 */
+	String USE_JETBRAINS_CUSTOM_DECORATIONS = "flatlaf.useJetBrainsCustomDecorations";
+
+	/**
+	 * Specifies whether menubar is embedded into custom window decorations.
+	 * <p>
+	 * <strong>Allowed Values</strong> {@code false} and {@code true}<br>
+	 * <strong>Default</strong> {@code true}
+	 */
+	String MENUBAR_EMBEDDED = "flatlaf.menuBarEmbedded";
+
+	/**
+	 * Specifies whether animations are enabled.
+	 * <p>
+	 * <strong>Allowed Values</strong> {@code false} and {@code true}<br>
+	 * <strong>Default</strong> {@code true}
+	 */
+	String ANIMATION = "flatlaf.animation";
+
+	/**
+	 * Specifies whether vertical text position is corrected when UI is scaled on HiDPI screens.
+	 * <p>
+	 * <strong>Allowed Values</strong> {@code false} and {@code true}<br>
+	 * <strong>Default</strong> {@code true}
+	 */
+	String USE_TEXT_Y_CORRECTION = "flatlaf.useTextYCorrection";
+
+	/**
+	 * Checks whether a system property is set and returns {@code true} if its value
+	 * is {@code "true"} (case-insensitive), otherwise it returns {@code false}.
+	 * If the system property is not set, {@code defaultValue} is returned.
+	 */
+	static boolean getBoolean( String key, boolean defaultValue ) {
+		String value = System.getProperty( key );
+		return (value != null) ? Boolean.parseBoolean( value ) : defaultValue;
+	}
+
+	/**
+	 * Checks whether a system property is set and returns {@code Boolean.TRUE} if its value
+	 * is {@code "true"} (case-insensitive) or returns {@code Boolean.FALSE} if its value
+	 * is {@code "false"} (case-insensitive). Otherwise {@code defaultValue} is returned.
+	 */
+	static Boolean getBooleanStrict( String key, Boolean defaultValue ) {
+		String value = System.getProperty( key );
+		if( "true".equalsIgnoreCase( value ) )
+			return Boolean.TRUE;
+		if( "false".equalsIgnoreCase( value ) )
+			return Boolean.FALSE;
+		return defaultValue;
+	}
+}

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

@@ -86,7 +86,7 @@ public class IntelliJTheme
 	 * Using a buffered input stream is not necessary.
 	 */
 	public static FlatLaf createLaf( InputStream in )
-		throws IOException, ParseException
+		throws IOException
 	{
 		return createLaf( new IntelliJTheme( in ) );
 	}
@@ -106,11 +106,13 @@ public class IntelliJTheme
 	 */
 	@SuppressWarnings( "unchecked" )
 	public IntelliJTheme( InputStream in )
-		throws IOException, ParseException
+		throws IOException
 	{
 		Map<String, Object> json;
 	    try( Reader reader = new InputStreamReader( in, StandardCharsets.UTF_8 ) ) {
 	    		json = (Map<String, Object>) Json.parse( reader );
+		} catch( ParseException ex ) {
+			throw new IOException( ex.getMessage(), ex );
 		}
 
 	    name = (String) json.get( "name" );
@@ -132,6 +134,8 @@ public class IntelliJTheme
 		defaults.put( "Button.paintShadow", true );
 		defaults.put( "Button.shadowWidth", dark ? 2 : 1 );
 
+		Map<Object, Object> themeSpecificDefaults = removeThemeSpecificDefaults( defaults );
+
 		loadNamedColors( defaults );
 
 		// convert Json "ui" structure to UI defaults
@@ -143,6 +147,15 @@ public class IntelliJTheme
 		applyColorPalette( defaults );
 		applyCheckBoxColors( defaults );
 
+		// copy values
+		for( Map.Entry<String, String> e : uiKeyCopying.entrySet() )
+			defaults.put( e.getKey(), defaults.get( e.getValue() ) );
+
+		// IDEA does not paint button background if disabled, but FlatLaf does
+		Object panelBackground = defaults.get( "Panel.background" );
+		defaults.put( "Button.disabledBackground", panelBackground );
+		defaults.put( "ToggleButton.disabledBackground", panelBackground );
+
 		// IDEA uses a 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" );
@@ -152,7 +165,7 @@ public class IntelliJTheme
 			helpButtonBorderColor = defaults.get( "Button.borderColor" );
 		defaults.put( "HelpButton.background", helpButtonBackground );
 		defaults.put( "HelpButton.borderColor", helpButtonBorderColor );
-		defaults.put( "HelpButton.disabledBackground", defaults.get( "Panel.background" ) );
+		defaults.put( "HelpButton.disabledBackground", panelBackground );
 		defaults.put( "HelpButton.disabledBorderColor", defaults.get( "Button.disabledBorderColor" ) );
 		defaults.put( "HelpButton.focusedBorderColor", defaults.get( "Button.focusedBorderColor" ) );
 		defaults.put( "HelpButton.focusedBackground", defaults.get( "Button.focusedBackground" ) );
@@ -183,6 +196,42 @@ public class IntelliJTheme
 			if( !uiKeys.contains( "Spinner.background" ) )
 				defaults.put( "Spinner.background", textFieldBackground );
 		}
+
+		// fix ToggleButton
+		if( !uiKeys.contains( "ToggleButton.startBackground" ) && !uiKeys.contains( "*.startBackground" ) )
+			defaults.put( "ToggleButton.startBackground", defaults.get( "Button.startBackground" ) );
+		if( !uiKeys.contains( "ToggleButton.endBackground" ) && !uiKeys.contains( "*.endBackground" ) )
+			defaults.put( "ToggleButton.endBackground", defaults.get( "Button.endBackground" ) );
+		if( !uiKeys.contains( "ToggleButton.foreground" ) && uiKeys.contains( "Button.foreground" ) )
+			defaults.put( "ToggleButton.foreground", defaults.get( "Button.foreground" ) );
+
+		// limit tree row height
+		int rowHeight = defaults.getInt( "Tree.rowHeight" );
+		if( rowHeight > 22 )
+			defaults.put( "Tree.rowHeight", 22 );
+
+		// apply theme specific UI defaults at the end to allow overwriting
+		defaults.putAll( themeSpecificDefaults );
+	}
+
+	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( "[" ) )
+				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( ' ', '_' ) + ']';
+		for( String key : themeSpecificKeys ) {
+			Object value = defaults.remove( key );
+			if( key.startsWith( currentThemePrefix ) )
+				themeSpecificDefaults.put( key.substring( currentThemePrefix.length() ), value );
+		}
+
+		return themeSpecificDefaults;
 	}
 
 	/**
@@ -200,7 +249,7 @@ public class IntelliJTheme
 			if( color != null ) {
 				String key = e.getKey();
 				namedColors.put( key, color );
-				defaults.put( "ColorPalette." + e.getKey(), color );
+				defaults.put( "ColorPalette." + key, color );
 			}
 		}
 	}
@@ -214,8 +263,16 @@ public class IntelliJTheme
 			for( Map.Entry<String, Object> e : ((Map<String, Object>)value).entrySet() )
 				apply( key + '.' + e.getKey(), e.getValue(), defaults, defaultsKeysCache, uiKeys );
 		} else {
+			if( "".equals( value ) )
+				return; // ignore empty value
+
 			uiKeys.add( key );
 
+			// fix ComboBox size and Spinner border in all Material UI Lite themes
+			boolean isMaterialUILite = author.equals( "Mallowigi" );
+			if( isMaterialUILite && (key.equals( "ComboBox.padding" ) || key.equals( "Spinner.border" )) )
+				return; // ignore
+
 			// map keys
 			key = uiKeyMapping.getOrDefault( key, key );
 			if( key.isEmpty() )
@@ -270,7 +327,7 @@ public class IntelliJTheme
 						// (e.g. set ComboBox.buttonEditableBackground to *.background
 						// because it is mapped from ComboBox.ArrowButton.background)
 						String km = uiKeyInverseMapping.getOrDefault( k, (String) k );
-						if( km.endsWith( tail ) && !noWildcardReplace.contains( k ) && !((String)k).startsWith( "CheckBox.icon." ) )
+						if( km.endsWith( tail ) && !((String)k).startsWith( "CheckBox.icon." ) )
 							defaults.put( k, uiValue );
 					}
 				}
@@ -362,6 +419,10 @@ public class IntelliJTheme
 
 			String newKey = checkboxKeyMapping.get( key );
 			if( newKey != null ) {
+				String checkBoxIconPrefix = "CheckBox.icon.";
+				if( !dark && newKey.startsWith( checkBoxIconPrefix ) )
+					newKey = "CheckBox.icon[filled].".concat( newKey.substring( checkBoxIconPrefix.length() ) );
+
 				ColorUIResource color = toColor( (String) value );
 				if( color != null ) {
 					defaults.put( newKey, color );
@@ -394,25 +455,33 @@ public class IntelliJTheme
 
 		// remove hover and pressed colors
 		if( checkboxModified ) {
+			defaults.remove( "CheckBox.icon.focusWidth" );
 			defaults.remove( "CheckBox.icon.hoverBorderColor" );
 			defaults.remove( "CheckBox.icon.focusedBackground" );
 			defaults.remove( "CheckBox.icon.hoverBackground" );
 			defaults.remove( "CheckBox.icon.pressedBackground" );
+			defaults.remove( "CheckBox.icon.selectedFocusedBackground" );
 			defaults.remove( "CheckBox.icon.selectedHoverBackground" );
 			defaults.remove( "CheckBox.icon.selectedPressedBackground" );
-		}
 
-		// copy values
-		for( Map.Entry<String, String> e : uiKeyCopying.entrySet() )
-			defaults.put( e.getKey(), defaults.get( e.getValue() ) );
+			defaults.remove( "CheckBox.icon[filled].focusWidth" );
+			defaults.remove( "CheckBox.icon[filled].hoverBorderColor" );
+			defaults.remove( "CheckBox.icon[filled].focusedBackground" );
+			defaults.remove( "CheckBox.icon[filled].hoverBackground" );
+			defaults.remove( "CheckBox.icon[filled].pressedBackground" );
+			defaults.remove( "CheckBox.icon[filled].selectedFocusedBackground" );
+			defaults.remove( "CheckBox.icon[filled].selectedHoverBackground" );
+			defaults.remove( "CheckBox.icon[filled].selectedPressedBackground" );
+		}
 	}
 
+	/** Rename UI default keys (key --> value). */
 	private static 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 Set<String> noWildcardReplace = new HashSet<>();
 
 	static {
 		// ComboBox
@@ -423,14 +492,35 @@ public class IntelliJTheme
 		uiKeyMapping.put( "ComboBox.ArrowButton.iconColor",             "ComboBox.buttonArrowColor" );
 		uiKeyMapping.put( "ComboBox.ArrowButton.nonEditableBackground", "ComboBox.buttonBackground" );
 
+		// Component
+		uiKeyMapping.put( "Component.inactiveErrorFocusColor",   "Component.error.borderColor" );
+		uiKeyMapping.put( "Component.errorFocusColor",           "Component.error.focusedBorderColor" );
+		uiKeyMapping.put( "Component.inactiveWarningFocusColor", "Component.warning.borderColor" );
+		uiKeyMapping.put( "Component.warningFocusColor",         "Component.warning.focusedBorderColor" );
+
 		// Link
 		uiKeyMapping.put( "Link.activeForeground", "Component.linkColor" );
 
+		// Menu
+		uiKeyMapping.put( "Menu.border",                "Menu.margin" );
+		uiKeyMapping.put( "MenuItem.border",            "MenuItem.margin" );
+		uiKeyCopying.put( "CheckBoxMenuItem.margin",    "MenuItem.margin" );
+		uiKeyCopying.put( "RadioButtonMenuItem.margin", "MenuItem.margin" );
+		uiKeyMapping.put( "PopupMenu.border",           "PopupMenu.borderInsets" );
+
+		// IDEA uses List.selectionBackground also for menu selection
+		uiKeyCopying.put( "Menu.selectionBackground",                "List.selectionBackground" );
+		uiKeyCopying.put( "MenuItem.selectionBackground",            "List.selectionBackground" );
+		uiKeyCopying.put( "CheckBoxMenuItem.selectionBackground",    "List.selectionBackground" );
+		uiKeyCopying.put( "RadioButtonMenuItem.selectionBackground", "List.selectionBackground" );
+
 		// ProgressBar
 		uiKeyMapping.put( "ProgressBar.background",    "" ); // ignore
 		uiKeyMapping.put( "ProgressBar.foreground",    "" ); // ignore
 		uiKeyMapping.put( "ProgressBar.trackColor",    "ProgressBar.background" );
 		uiKeyMapping.put( "ProgressBar.progressColor", "ProgressBar.foreground" );
+		uiKeyCopying.put( "ProgressBar.selectionForeground", "ProgressBar.background" );
+		uiKeyCopying.put( "ProgressBar.selectionBackground", "ProgressBar.foreground" );
 
 		// ScrollBar
 		uiKeyMapping.put( "ScrollBar.trackColor", "ScrollBar.track" );
@@ -441,6 +531,14 @@ public class IntelliJTheme
 
 		// Slider
 		uiKeyMapping.put( "Slider.trackWidth", "" ); // ignore (used in Material Theme UI Lite)
+		uiKeyCopying.put( "Slider.trackValueColor", "ProgressBar.foreground" );
+		uiKeyCopying.put( "Slider.thumbColor", "ProgressBar.foreground" );
+		uiKeyCopying.put( "Slider.trackColor", "ProgressBar.background" );
+
+		// TitlePane
+		uiKeyCopying.put( "TitlePane.inactiveBackground",     "TitlePane.background" );
+		uiKeyMapping.put( "TitlePane.infoForeground",         "TitlePane.foreground" );
+		uiKeyMapping.put( "TitlePane.inactiveInfoForeground", "TitlePane.inactiveForeground" );
 
 		for( Map.Entry<String, String> e : uiKeyMapping.entrySet() )
 			uiKeyInverseMapping.put( e.getValue(), e.getKey() );
@@ -456,7 +554,7 @@ public class IntelliJTheme
 		checkboxKeyMapping.put( "Checkbox.Border.Default",      "CheckBox.icon.borderColor" );
 		checkboxKeyMapping.put( "Checkbox.Border.Disabled",     "CheckBox.icon.disabledBorderColor" );
 		checkboxKeyMapping.put( "Checkbox.Focus.Thin.Default",  "CheckBox.icon.focusedBorderColor" );
-		checkboxKeyMapping.put( "Checkbox.Focus.Wide",          "CheckBox.icon.focusedColor" );
+		checkboxKeyMapping.put( "Checkbox.Focus.Wide",          "CheckBox.icon.focusColor" );
 		checkboxKeyMapping.put( "Checkbox.Foreground.Disabled", "CheckBox.icon.disabledCheckmarkColor" );
 		checkboxKeyMapping.put( "Checkbox.Background.Selected", "CheckBox.icon.selectedBackground" );
 		checkboxKeyMapping.put( "Checkbox.Border.Selected",     "CheckBox.icon.selectedBorderColor" );
@@ -470,16 +568,6 @@ public class IntelliJTheme
 		Map.Entry<String, String>[] entries = checkboxDuplicateColors.entrySet().toArray( new Map.Entry[checkboxDuplicateColors.size()] );
 		for( Map.Entry<String, String> e : entries )
 			checkboxDuplicateColors.put( e.getValue(), e.getKey() );
-
-		// because FlatLaf uses Button.background and Button.borderColor,
-		// but IDEA uses Button.startBackground and Button.startBorderColor,
-		// our default button background and border colors may be replaced by
-		// wildcard *.background and *.borderColor colors
-		noWildcardReplace.add( "Button.background" );
-		noWildcardReplace.add( "Button.borderColor" );
-		noWildcardReplace.add( "Button.default.background" );
-		noWildcardReplace.add( "Button.default.borderColor" );
-		noWildcardReplace.add( "ToggleButton.background" );
 	}
 
 	//---- class ThemeLaf -----------------------------------------------------
@@ -500,7 +588,7 @@ public class IntelliJTheme
 
 		@Override
 		public String getDescription() {
-			return theme.name;
+			return getName();
 		}
 
 		@Override
@@ -513,19 +601,12 @@ public class IntelliJTheme
 		}
 
 		@Override
-		public UIDefaults getDefaults() {
-			UIDefaults defaults = super.getDefaults();
+		void applyAdditionalDefaults( UIDefaults defaults ) {
 			theme.applyProperties( defaults );
-			super.invokePostInitialization( defaults );
-			return defaults;
 		}
 
 		@Override
-		void invokePostInitialization( UIDefaults defaults ) {
-		}
-
-		@Override
-		ArrayList<Class<?>> getLafClassesForDefaultsLoading() {
+		protected ArrayList<Class<?>> getLafClassesForDefaultsLoading() {
 			ArrayList<Class<?>> lafClasses = new ArrayList<>();
 			lafClasses.add( FlatLaf.class );
 			lafClasses.add( theme.dark ? FlatDarkLaf.class : FlatLightLaf.class );

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.GraphicsConfiguration;
 import java.awt.GraphicsEnvironment;
 import java.awt.Toolkit;
 import java.io.BufferedReader;
@@ -28,9 +29,9 @@ import java.util.Collections;
 import java.util.List;
 import java.util.StringTokenizer;
 import java.util.logging.Level;
-import javax.swing.text.StyleContext;
 import com.formdev.flatlaf.util.StringUtils;
 import com.formdev.flatlaf.util.SystemInfo;
+import com.formdev.flatlaf.util.UIScale;
 
 /**
  * @author Karl Tauber
@@ -38,7 +39,7 @@ import com.formdev.flatlaf.util.SystemInfo;
 class LinuxFontPolicy
 {
 	static Font getFont() {
-		return SystemInfo.IS_KDE ? getKDEFont() : getGnomeFont();
+		return SystemInfo.isKDE ? getKDEFont() : getGnomeFont();
 	}
 
 	/**
@@ -73,6 +74,13 @@ class LinuxFontPolicy
 				family = family.isEmpty() ? word : (family + ' ' + word);
 		}
 
+		// Ubuntu font is rendered poorly (except if running in JetBrains VM)
+		// --> use Liberation Sans font
+		if( family.startsWith( "Ubuntu" ) &&
+			!SystemInfo.isJetBrainsJVM &&
+			!FlatSystemProperties.getBoolean( FlatSystemProperties.USE_UBUNTU_FONT, false ) )
+		  family = "Liberation Sans";
+
 		// scale font size
 		double dsize = size * getGnomeFontScale();
 		size = (int) (dsize + 0.5);
@@ -88,9 +96,7 @@ class LinuxFontPolicy
 	}
 
 	private static Font createFont( String family, int style, int size, double dsize ) {
-		// using StyleContext.getFont() here because it uses
-		// sun.font.FontUtilities.getCompositeFontUIResource()
-		Font font = new StyleContext().getFont( family, style, size );
+		Font font = FlatLaf.createCompositeFont( family, style, size );
 
 		// set font size in floating points
 		font = font.deriveFont( style, (float) dsize );
@@ -99,6 +105,10 @@ class LinuxFontPolicy
 	}
 
 	private static double getGnomeFontScale() {
+		// do not scale font here if JRE scales
+		if( isSystemScaling() )
+			return 96. / 72.;
+
 		// see class com.sun.java.swing.plaf.gtk.PangoFonts background information
 
 		Object value = Toolkit.getDefaultToolkit().getDesktopProperty( "gnome.Xft/DPI" );
@@ -168,7 +178,7 @@ class LinuxFontPolicy
 
 		// font dpi
 		int dpi = 96;
-		if( forceFontDPI != null ) {
+		if( forceFontDPI != null && !isSystemScaling() ) {
 			try {
 				dpi = Integer.parseInt( forceFontDPI );
 				if( dpi <= 0 )
@@ -247,4 +257,15 @@ class LinuxFontPolicy
 		}
 		return null;
 	}
+
+	/**
+	 * Returns true if the JRE scales, which is the case if:
+	 *   - environment variable GDK_SCALE is set and running on Java 9 or later
+	 *   - running on JetBrains Runtime 11 or later and scaling is enabled in system Settings
+	 */
+	private static boolean isSystemScaling() {
+		GraphicsConfiguration gc = GraphicsEnvironment.getLocalGraphicsEnvironment()
+			.getDefaultScreenDevice().getDefaultConfiguration();
+		return UIScale.getSystemScaleFactor( gc ) > 1;
+	}
 }

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

@@ -0,0 +1,259 @@
+/*
+ * Copyright 2020 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.Component;
+import java.awt.Container;
+import java.awt.EventQueue;
+import java.awt.KeyEventPostProcessor;
+import java.awt.KeyboardFocusManager;
+import java.awt.Window;
+import java.awt.event.KeyEvent;
+import java.awt.event.WindowAdapter;
+import java.awt.event.WindowEvent;
+import java.awt.event.WindowListener;
+import java.lang.ref.WeakReference;
+import javax.swing.AbstractButton;
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JMenu;
+import javax.swing.JMenuBar;
+import javax.swing.JRootPane;
+import javax.swing.JTabbedPane;
+import javax.swing.MenuElement;
+import javax.swing.MenuSelectionManager;
+import javax.swing.SwingUtilities;
+import javax.swing.UIManager;
+import javax.swing.event.ChangeEvent;
+import javax.swing.event.ChangeListener;
+import com.formdev.flatlaf.util.SystemInfo;
+
+/**
+ * Show/hide mnemonics.
+ *
+ * @author Karl Tauber
+ */
+class MnemonicHandler
+	implements KeyEventPostProcessor, ChangeListener
+{
+	private static boolean showMnemonics;
+	private static WeakReference<Window> lastShowMnemonicWindow;
+	private static WindowListener windowListener;
+
+	static boolean isShowMnemonics() {
+		return showMnemonics || !UIManager.getBoolean( "Component.hideMnemonics" );
+	}
+
+	void install() {
+		KeyboardFocusManager.getCurrentKeyboardFocusManager().addKeyEventPostProcessor( this );
+		MenuSelectionManager.defaultManager().addChangeListener( this );
+	}
+
+	void uninstall() {
+		KeyboardFocusManager.getCurrentKeyboardFocusManager().removeKeyEventPostProcessor( this );
+		MenuSelectionManager.defaultManager().removeChangeListener( this );
+	}
+
+	@Override
+	public boolean postProcessKeyEvent( KeyEvent e ) {
+		int keyCode = e.getKeyCode();
+		if( SystemInfo.isMacOS ) {
+			// Ctrl+Alt keys must be pressed on Mac
+			if( keyCode == KeyEvent.VK_CONTROL || keyCode == KeyEvent.VK_ALT )
+				showMnemonics( shouldShowMnemonics( e ) && e.isControlDown() && e.isAltDown(), e.getComponent() );
+		} else {
+			// Alt key must be pressed on Windows and Linux
+			if( SystemInfo.isWindows )
+				return processKeyEventOnWindows( e );
+
+			if( keyCode == KeyEvent.VK_ALT )
+				showMnemonics( shouldShowMnemonics( e ), e.getComponent() );
+		}
+
+		return false;
+	}
+
+	private boolean shouldShowMnemonics( KeyEvent e ) {
+		return e.getID() == KeyEvent.KEY_PRESSED ||
+			MenuSelectionManager.defaultManager().getSelectedPath().length > 0;
+	}
+
+	private static int altPressedEventCount;
+	private static boolean selectMenuOnAltReleased;
+
+	/**
+	 * Special Alt key behavior on Windows.
+	 *
+	 * Press-and-release Alt key selects first menu (if available) and moves focus
+	 * temporary to menu bar. If menu bar has focus (some menu is selected),
+	 * pressing Alt key unselects menu and moves focus back to permanent focus owner.
+	 */
+	private boolean processKeyEventOnWindows( KeyEvent e ) {
+		if( e.getKeyCode() != KeyEvent.VK_ALT ) {
+			selectMenuOnAltReleased = false;
+			return false;
+		}
+
+		if( e.getID() == KeyEvent.KEY_PRESSED ) {
+			altPressedEventCount++;
+
+			if( altPressedEventCount == 1 && !e.isConsumed() ) {
+				MenuSelectionManager menuSelectionManager = MenuSelectionManager.defaultManager();
+				selectMenuOnAltReleased = (menuSelectionManager.getSelectedPath().length == 0);
+
+				// if menu is selected when Alt key is pressed then clear menu selection
+				if( !selectMenuOnAltReleased )
+					menuSelectionManager.clearSelectedPath();
+			}
+
+			// show mnemonics
+			showMnemonics( shouldShowMnemonics( e ), e.getComponent() );
+
+			// avoid that the system menu of the window gets focus
+			e.consume();
+			return true;
+
+		} else if( e.getID() == KeyEvent.KEY_RELEASED ) {
+			altPressedEventCount = 0;
+
+			boolean mnemonicsShown = false;
+			if( selectMenuOnAltReleased && !e.isConsumed() ) {
+				MenuSelectionManager menuSelectionManager = MenuSelectionManager.defaultManager();
+				if( menuSelectionManager.getSelectedPath().length == 0 ) {
+					// 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();
+					JMenu firstMenu = (menuBar != null) ? menuBar.getMenu( 0 ) : null;
+
+					// select first menu and show mnemonics
+					if( firstMenu != null ) {
+						menuSelectionManager.setSelectedPath( new MenuElement[] { menuBar, firstMenu } );
+						showMnemonics( true, c );
+						mnemonicsShown = true;
+					}
+				}
+			}
+			selectMenuOnAltReleased = false;
+
+			// hide mnemonics
+			if( !mnemonicsShown )
+				showMnemonics( shouldShowMnemonics( e ), e.getComponent() );
+		}
+		return false;
+	}
+
+	@Override
+	public void stateChanged( ChangeEvent e ) {
+		MenuElement[] selectedPath = MenuSelectionManager.defaultManager().getSelectedPath();
+		if( selectedPath.length == 0 && altPressedEventCount == 0 ) {
+			// hide mnemonics when menu selection was canceled
+			showMnemonics( false, null );
+		}
+	}
+
+	static void showMnemonics( boolean show, Component c ) {
+		if( show == showMnemonics )
+			return;
+
+		showMnemonics = show;
+
+		// check whether it is necessary to repaint
+		if( !UIManager.getBoolean( "Component.hideMnemonics" ) )
+			return;
+
+		if( show ) {
+			// get root pane
+			JRootPane rootPane = SwingUtilities.getRootPane( c );
+			if( rootPane == null )
+				return;
+
+			// get window
+			Window window = SwingUtilities.getWindowAncestor( rootPane );
+			if( window == null )
+				return;
+
+			// repaint components with mnemonics in focused window
+			repaintMnemonics( window );
+
+			// hide mnemonics if window is deactivated (e.g. Alt+Tab to another window)
+			windowListener = new WindowAdapter() {
+				@Override
+				public void windowDeactivated( WindowEvent e ) {
+					altPressedEventCount = 0;
+					selectMenuOnAltReleased = false;
+
+					// use invokeLater() to avoid that the listener is removed
+					// while the listener queue is iterated to fire this event
+					EventQueue.invokeLater( () -> {
+						showMnemonics( false, null );
+					} );
+				}
+			};
+			window.addWindowListener( windowListener );
+
+			lastShowMnemonicWindow = new WeakReference<>( window );
+		} else if( lastShowMnemonicWindow != null ) {
+			Window window = lastShowMnemonicWindow.get();
+			if( window != null ) {
+				repaintMnemonics( window );
+
+				if( windowListener != null ) {
+					window.removeWindowListener( windowListener );
+					windowListener = null;
+				}
+			}
+
+			lastShowMnemonicWindow = null;
+		}
+	}
+
+	private static void repaintMnemonics( Container container ) {
+		for( Component c : container.getComponents() ) {
+			if( !c.isVisible() )
+				continue;
+
+			if( hasMnemonic( c ) )
+				c.repaint();
+
+			if( c instanceof Container )
+				repaintMnemonics( (Container) c );
+		}
+	}
+
+	private static boolean hasMnemonic( Component c ) {
+		if( c instanceof JLabel && ((JLabel)c).getDisplayedMnemonicIndex() >= 0 )
+			return true;
+
+		if( c instanceof AbstractButton && ((AbstractButton)c).getDisplayedMnemonicIndex() >= 0 )
+			return true;
+
+		if( c instanceof JTabbedPane ) {
+			JTabbedPane tabPane = (JTabbedPane) c;
+			int tabCount = tabPane.getTabCount();
+			for( int i = 0; i < tabCount; i++ ) {
+				if( tabPane.getDisplayedMnemonicIndexAt( i ) >= 0 )
+					return true;
+			}
+		}
+
+		return false;
+	}
+}

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

@@ -19,16 +19,19 @@ package com.formdev.flatlaf;
 import java.awt.Color;
 import java.awt.Dimension;
 import java.awt.Insets;
+import java.io.File;
+import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.HashMap;
+import java.util.Iterator;
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
+import java.util.Map.Entry;
 import java.util.Properties;
-import java.util.ServiceLoader;
 import java.util.function.Function;
 import java.util.logging.Level;
 import javax.swing.UIDefaults;
@@ -41,7 +44,9 @@ import javax.swing.plaf.InsetsUIResource;
 import com.formdev.flatlaf.ui.FlatEmptyBorder;
 import com.formdev.flatlaf.ui.FlatLineBorder;
 import com.formdev.flatlaf.util.ColorFunctions;
+import com.formdev.flatlaf.util.ColorFunctions.ColorFunction;
 import com.formdev.flatlaf.util.DerivedColor;
+import com.formdev.flatlaf.util.GrayFilter;
 import com.formdev.flatlaf.util.HSLColor;
 import com.formdev.flatlaf.util.StringUtils;
 import com.formdev.flatlaf.util.SystemInfo;
@@ -63,13 +68,13 @@ class UIDefaultsLoader
 	private static final String TYPE_PREFIX = "{";
 	private static final String TYPE_PREFIX_END = "}";
 	private static final String VARIABLE_PREFIX = "@";
-	@Deprecated
-	private static final String REF_PREFIX = VARIABLE_PREFIX + "@";
 	private static final String PROPERTY_PREFIX = "$";
 	private static final String OPTIONAL_PREFIX = "?";
 	private static final String GLOBAL_PREFIX = "*.";
 
-	static void loadDefaultsFromProperties( Class<?> lookAndFeelClass, UIDefaults defaults ) {
+	static void loadDefaultsFromProperties( Class<?> lookAndFeelClass, List<FlatDefaultsAddon> addons,
+		Properties additionalDefaults, boolean dark, UIDefaults defaults )
+	{
 		// determine classes in class hierarchy in reverse order
 		ArrayList<Class<?>> lafClasses = new ArrayList<>();
 		for( Class<?> lafClass = lookAndFeelClass;
@@ -79,10 +84,12 @@ class UIDefaultsLoader
 			lafClasses.add( 0, lafClass );
 		}
 
-		loadDefaultsFromProperties( lafClasses, defaults );
+		loadDefaultsFromProperties( lafClasses, addons, additionalDefaults, dark, defaults );
 	}
 
-	static void loadDefaultsFromProperties( List<Class<?>> lafClasses, UIDefaults defaults ) {
+	static void loadDefaultsFromProperties( List<Class<?>> lafClasses, List<FlatDefaultsAddon> addons,
+		Properties additionalDefaults, boolean dark, UIDefaults defaults )
+	{
 		try {
 			// load core properties files
 			Properties properties = new Properties();
@@ -94,15 +101,8 @@ class UIDefaultsLoader
 				}
 			}
 
-			// get addons and sort them by priority
-			ServiceLoader<FlatDefaultsAddon> addonLoader = ServiceLoader.load( FlatDefaultsAddon.class );
-			List<FlatDefaultsAddon> addonList = new ArrayList<>();
-			for( FlatDefaultsAddon addon : addonLoader )
-				addonList.add( addon );
-			addonList.sort( (addon1, addon2) -> addon1.getPriority() - addon2.getPriority() );
-
 			// load properties from addons
-			for( FlatDefaultsAddon addon : addonList ) {
+			for( FlatDefaultsAddon addon : addons ) {
 				for( Class<?> lafClass : lafClasses ) {
 					try( InputStream in = addon.getDefaults( lafClass ) ) {
 						if( in != null )
@@ -113,26 +113,84 @@ class UIDefaultsLoader
 
 			// collect addon class loaders
 			List<ClassLoader> addonClassLoaders = new ArrayList<>();
-			for( FlatDefaultsAddon addon : addonList ) {
+			for( FlatDefaultsAddon addon : addons ) {
 				ClassLoader addonClassLoader = addon.getClass().getClassLoader();
 				if( !addonClassLoaders.contains( addonClassLoader ) )
 					addonClassLoaders.add( addonClassLoader );
 			}
 
+			// load custom properties files (usually provides by applications)
+			List<Object> customDefaultsSources = FlatLaf.getCustomDefaultsSources();
+			int size = (customDefaultsSources != null) ? customDefaultsSources.size() : 0;
+			for( int i = 0; i < size; i++ ) {
+				Object source = customDefaultsSources.get( i );
+				if( source instanceof String && i + 1 < size ) {
+					// load from package in classloader
+					String packageName = (String) source;
+					ClassLoader classLoader = (ClassLoader) customDefaultsSources.get( ++i );
+
+					// use class loader also for instantiating classes specified in values
+					if( classLoader != null && !addonClassLoaders.contains( classLoader ) )
+						addonClassLoaders.add( classLoader );
+
+					packageName = packageName.replace( '.', '/' );
+					if( classLoader == null )
+						classLoader = FlatLaf.class.getClassLoader();
+
+					for( Class<?> lafClass : lafClasses ) {
+						String propertiesName = packageName + '/' + lafClass.getSimpleName() + ".properties";
+						try( InputStream in = classLoader.getResourceAsStream( propertiesName ) ) {
+							if( in != null )
+								properties.load( in );
+						}
+					}
+				} else if( source instanceof File ) {
+					// load from folder
+					File folder = (File) source;
+					for( Class<?> lafClass : lafClasses ) {
+						File propertiesFile = new File( folder, lafClass.getSimpleName() + ".properties" );
+						if( !propertiesFile.isFile() )
+							continue;
+
+						try( InputStream in = new FileInputStream( propertiesFile ) ) {
+							properties.load( in );
+						}
+					}
+				}
+			}
+
+			// add additional defaults
+			if( additionalDefaults != null )
+				properties.putAll( additionalDefaults );
+
 			// collect all platform specific keys (but do not modify properties)
 			ArrayList<String> platformSpecificKeys = new ArrayList<>();
-			for( Object key : properties.keySet() ) {
-				if( ((String)key).startsWith( "[" ) )
-					platformSpecificKeys.add( (String) key );
+			for( Object okey : properties.keySet() ) {
+				String key = (String) okey;
+				if( key.startsWith( "[" ) &&
+					(key.startsWith( "[win]" ) ||
+					 key.startsWith( "[mac]" ) ||
+					 key.startsWith( "[linux]" ) ||
+					 key.startsWith( "[light]" ) ||
+					 key.startsWith( "[dark]" )) )
+				  platformSpecificKeys.add( key );
 			}
 
 			// remove platform specific properties and re-add only properties
 			// for current platform, but with platform prefix removed
 			if( !platformSpecificKeys.isEmpty() ) {
+				// handle light/dark specific properties
+				String lightOrDarkPrefix = dark ? "[dark]" : "[light]";
+				for( String key : platformSpecificKeys ) {
+					if( key.startsWith( lightOrDarkPrefix ) )
+						properties.put( key.substring( lightOrDarkPrefix.length() ), properties.remove( key ) );
+				}
+
+				// handle platform specific properties
 				String platformPrefix =
-					SystemInfo.IS_WINDOWS ? "[win]" :
-					SystemInfo.IS_MAC ? "[mac]" :
-					SystemInfo.IS_LINUX ? "[linux]" : "[unknown]";
+					SystemInfo.isWindows ? "[win]" :
+					SystemInfo.isMacOS ? "[mac]" :
+					SystemInfo.isLinux ? "[linux]" : "[unknown]";
 				for( String key : platformSpecificKeys ) {
 					Object value = properties.remove( key );
 					if( key.startsWith( platformPrefix ) )
@@ -140,45 +198,48 @@ class UIDefaultsLoader
 				}
 			}
 
-			Function<String, String> resolver = value -> {
-				return resolveValue( properties, value );
-			};
-
-			// get globals, which override all other defaults that end with same suffix
-			HashMap<String, Object> globals = new HashMap<>();
-			for( Map.Entry<Object, Object> e : properties.entrySet() ) {
+			// get (and remove) globals, which override all other defaults that end with same suffix
+			HashMap<String, String> globals = new HashMap<>();
+			Iterator<Entry<Object, Object>> it = properties.entrySet().iterator();
+			while( it.hasNext() ) {
+				Entry<Object, Object> e = it.next();
 				String key = (String) e.getKey();
-				if( !key.startsWith( GLOBAL_PREFIX ) )
-					continue;
-
-				String value = resolveValue( properties, (String) e.getValue() );
-				try {
-					globals.put( key.substring( GLOBAL_PREFIX.length() ), parseValue( key, value, resolver, addonClassLoaders ) );
-				} catch( RuntimeException ex ) {
-					logParseError( Level.SEVERE, key, value, ex );
+				if( key.startsWith( GLOBAL_PREFIX ) ) {
+					globals.put( key.substring( GLOBAL_PREFIX.length() ), (String) e.getValue() );
+					it.remove();
 				}
 			}
 
 			// override UI defaults with globals
 			for( Object key : defaults.keySet() ) {
-				if( key instanceof String && ((String)key).contains( "." ) ) {
-					String skey = (String) key;
-					String globalKey = skey.substring( skey.lastIndexOf( '.' ) + 1 );
-					Object globalValue = globals.get( globalKey );
-					if( globalValue != null )
-						defaults.put( key, globalValue );
-				}
+				int dot;
+				if( !(key instanceof String) ||
+					properties.containsKey( key ) ||
+					(dot = ((String)key).lastIndexOf( '.' )) < 0 )
+				  continue;
+
+				String globalKey = ((String)key).substring( dot + 1 );
+				String globalValue = globals.get( globalKey );
+				if( globalValue != null )
+					properties.put( key, globalValue );
 			}
 
-			// add non-global properties to UI defaults
+			Function<String, String> propertiesGetter = key -> {
+				return properties.getProperty( key );
+			};
+			Function<String, String> resolver = value -> {
+				return resolveValue( value, propertiesGetter );
+			};
+
+			// parse and add properties to UI defaults
 			for( Map.Entry<Object, Object> e : properties.entrySet() ) {
 				String key = (String) e.getKey();
-				if( key.startsWith( VARIABLE_PREFIX ) || key.startsWith( GLOBAL_PREFIX ) )
+				if( key.startsWith( VARIABLE_PREFIX ) )
 					continue;
 
-				String value = resolveValue( properties, (String) e.getValue() );
+				String value = resolveValue( (String) e.getValue(), propertiesGetter );
 				try {
-					defaults.put( key, parseValue( key, value, resolver, addonClassLoaders ) );
+					defaults.put( key, parseValue( key, value, null, resolver, addonClassLoaders ) );
 				} catch( RuntimeException ex ) {
 					logParseError( Level.SEVERE, key, value, ex );
 				}
@@ -192,25 +253,22 @@ class UIDefaultsLoader
 		FlatLaf.LOG.log( level, "FlatLaf: Failed to parse: '" + key + '=' + value + '\'', ex );
 	}
 
-	private static String resolveValue( Properties properties, String value ) {
+	static String resolveValue( String value, Function<String, String> propertiesGetter ) {
+		value = value.trim();
+		String value0 = value;
+
 		if( value.startsWith( PROPERTY_PREFIX ) )
 			value = value.substring( PROPERTY_PREFIX.length() );
 		else if( !value.startsWith( VARIABLE_PREFIX ) )
 			return value;
 
-		// for compatibility
-		if( value.startsWith( REF_PREFIX ) ) {
-			FlatLaf.LOG.log( Level.WARNING, "FlatLaf: Usage of '@@' in .properties files is deprecated. Use '$' instead." );
-			value = value.substring( REF_PREFIX.length() );
-		}
-
 		boolean optional = false;
 		if( value.startsWith( OPTIONAL_PREFIX ) ) {
 			value = value.substring( OPTIONAL_PREFIX.length() );
 			optional = true;
 		}
 
-		String newValue = properties.getProperty( value );
+		String newValue = propertiesGetter.apply( value );
 		if( newValue == null ) {
 			if( optional )
 				return "null";
@@ -218,29 +276,40 @@ class UIDefaultsLoader
 			throw new IllegalArgumentException( "variable or property '" + value + "' not found" );
 		}
 
-		return resolveValue( properties, newValue );
+		if( newValue.equals( value0 ) )
+			throw new IllegalArgumentException( "endless recursion in variable or property '" + value + "'" );
+
+		return resolveValue( newValue, propertiesGetter );
 	}
 
-	private enum ValueType { UNKNOWN, STRING, CHARACTER, INTEGER, FLOAT, BORDER, ICON, INSETS, DIMENSION, COLOR,
-		SCALEDINTEGER, SCALEDFLOAT, SCALEDINSETS, SCALEDDIMENSION, INSTANCE, CLASS }
+	enum ValueType { UNKNOWN, STRING, BOOLEAN, CHARACTER, INTEGER, FLOAT, BORDER, ICON, INSETS, DIMENSION, COLOR,
+		SCALEDINTEGER, SCALEDFLOAT, SCALEDINSETS, SCALEDDIMENSION, INSTANCE, CLASS, GRAYFILTER, NULL, LAZY }
+
+	private static ValueType[] tempResultValueType = new ValueType[1];
 
 	static Object parseValue( String key, String value ) {
-		return parseValue( key, value, v -> v, Collections.emptyList() );
+		return parseValue( key, value, null, v -> v, Collections.emptyList() );
 	}
 
-	private static Object parseValue( String key, String value, Function<String, String> resolver, List<ClassLoader> addonClassLoaders ) {
+	static Object parseValue( String key, String value, ValueType[] resultValueType,
+		Function<String, String> resolver, List<ClassLoader> addonClassLoaders )
+	{
+		if( resultValueType == null )
+			resultValueType = tempResultValueType;
+
 		value = value.trim();
 
 		// null, false, true
 		switch( value ) {
-			case "null":	return null;
-			case "false":	return false;
-			case "true":	return true;
+			case "null":	resultValueType[0] = ValueType.NULL; return null;
+			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 = value.substring( 5, value.length() - 1 ).trim();
 			return (LazyValue) t -> {
 				return lazyUIManagerGet( uiKey );
@@ -289,8 +358,12 @@ class UIDefaultsLoader
 				valueType = ValueType.CHARACTER;
 			else if( key.endsWith( "UI" ) )
 				valueType = ValueType.STRING;
+			else if( key.endsWith( "grayFilter" ) )
+				valueType = ValueType.GRAYFILTER;
 		}
 
+		resultValueType[0] = valueType;
+
 		// parse value
 		switch( valueType ) {
 			case STRING:		return value;
@@ -308,40 +381,49 @@ class UIDefaultsLoader
 			case SCALEDDIMENSION:return parseScaledDimension( value );
 			case INSTANCE:		return parseInstance( value, addonClassLoaders );
 			case CLASS:			return parseClass( value, addonClassLoaders );
+			case GRAYFILTER:	return parseGrayFilter( value );
 			case UNKNOWN:
 			default:
 				// colors
 				Object color = parseColorOrFunction( value, resolver, false );
-				if( color != null )
+				if( color != null ) {
+					resultValueType[0] = ValueType.COLOR;
 					return color;
+				}
 
 				// integer
 				Integer integer = parseInteger( value, false );
-				if( integer != null )
+				if( integer != null ) {
+					resultValueType[0] = ValueType.INTEGER;
 					return integer;
+				}
 
 				// float
 				Float f = parseFloat( value, false );
-				if( f != null )
+				if( f != null ) {
+					resultValueType[0] = ValueType.FLOAT;
 					return f;
+				}
 
 				// string
+				resultValueType[0] = ValueType.STRING;
 				return value;
 		}
 	}
 
 	private static Object parseBorder( String value, Function<String, String> resolver, List<ClassLoader> addonClassLoaders ) {
 		if( value.indexOf( ',' ) >= 0 ) {
-			// top,left,bottom,right[,lineColor]
+			// top,left,bottom,right[,lineColor[,lineThickness]]
 			List<String> parts = split( value, ',' );
 			Insets insets = parseInsets( value );
-			ColorUIResource lineColor = (parts.size() == 5)
+			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;
 
 			return (LazyValue) t -> {
 				return (lineColor != null)
-					? new FlatLineBorder( insets, lineColor )
+					? new FlatLineBorder( insets, lineColor, lineThickness )
 					: new FlatEmptyBorder( insets );
 			};
 		} else
@@ -496,12 +578,18 @@ class UIDefaultsLoader
 			throw new IllegalArgumentException( "missing parameters in function '" + value + "'" );
 
 		switch( function ) {
-			case "rgb":			return parseColorRgbOrRgba( false, params );
-			case "rgba":		return parseColorRgbOrRgba( true, params );
+			case "rgb":			return parseColorRgbOrRgba( false, params, resolver, reportError );
+			case "rgba":		return parseColorRgbOrRgba( true, params, resolver, reportError );
 			case "hsl":			return parseColorHslOrHsla( false, params );
 			case "hsla":		return parseColorHslOrHsla( true, params );
-			case "lighten":		return parseColorLightenOrDarken( true, params, resolver, reportError );
-			case "darken":		return parseColorLightenOrDarken( false, params, resolver, reportError );
+			case "lighten":		return parseColorHSLIncreaseDecrease( 2, true, params, resolver, reportError );
+			case "darken":		return parseColorHSLIncreaseDecrease( 2, false, params, resolver, reportError );
+			case "saturate":	return parseColorHSLIncreaseDecrease( 1, true, params, resolver, reportError );
+			case "desaturate":	return parseColorHSLIncreaseDecrease( 1, false, params, resolver, reportError );
+			case "fadein":		return parseColorHSLIncreaseDecrease( 3, true, params, resolver, reportError );
+			case "fadeout":		return parseColorHSLIncreaseDecrease( 3, false, params, resolver, reportError );
+			case "fade":		return parseColorFade( params, resolver, reportError );
+			case "spin":		return parseColorSpin( params, resolver, reportError );
 		}
 
 		throw new IllegalArgumentException( "unknown color function '" + value + "'" );
@@ -509,16 +597,29 @@ class UIDefaultsLoader
 
 	/**
 	 * Syntax: rgb(red,green,blue) or rgba(red,green,blue,alpha)
-	 *   - red: an integer 0-255
-	 *   - green: an integer 0-255
-	 *   - blue: an integer 0-255
-	 *   - alpha: an integer 0-255
+	 *   - red:   an integer 0-255 or a percentage 0-100%
+	 *   - green: an integer 0-255 or a percentage 0-100%
+	 *   - blue:  an integer 0-255 or a percentage 0-100%
+	 *   - alpha: an integer 0-255 or a percentage 0-100%
 	 */
-	private static ColorUIResource parseColorRgbOrRgba( boolean hasAlpha, List<String> params ) {
-		int red = parseInteger( params.get( 0 ), 0, 255 );
-		int green = parseInteger( params.get( 1 ), 0, 255 );
-		int blue = parseInteger( params.get( 2 ), 0, 255 );
-		int alpha = hasAlpha ? parseInteger( params.get( 3 ), 0, 255 ) : 255;
+	private static ColorUIResource parseColorRgbOrRgba( boolean hasAlpha, List<String> params,
+		Function<String, String> resolver, boolean reportError )
+	{
+		if( hasAlpha && params.size() == 2 ) {
+			// syntax rgba(color,alpha), which allows adding alpha to any color
+			// NOTE: this syntax is deprecated
+			//       use fade(color,alpha) instead
+			String colorStr = params.get( 0 );
+			int alpha = parseInteger( params.get( 1 ), 0, 255, true );
+
+			ColorUIResource color = (ColorUIResource) parseColorOrFunction( resolver.apply( colorStr ), resolver, reportError );
+			return new ColorUIResource( new Color( ((alpha & 0xff) << 24) | (color.getRGB() & 0xffffff), true ) );
+		}
+
+		int red = parseInteger( params.get( 0 ), 0, 255, true );
+		int green = parseInteger( params.get( 1 ), 0, 255, true );
+		int blue = parseInteger( params.get( 2 ), 0, 255, true );
+		int alpha = hasAlpha ? parseInteger( params.get( 3 ), 0, 255, true ) : 255;
 
 		return hasAlpha
 			? new ColorUIResource( new Color( red, green, blue, alpha ) )
@@ -533,7 +634,7 @@ class UIDefaultsLoader
 	 *   - alpha: a percentage 0-100%
 	 */
 	private static ColorUIResource parseColorHslOrHsla( boolean hasAlpha, List<String> params ) {
-		int hue = parseInteger( params.get( 0 ), 0, 360 );
+		int hue = parseInteger( params.get( 0 ), 0, 360, false );
 		int saturation = parsePercentage( params.get( 1 ) );
 		int lightness = parsePercentage( params.get( 2 ) );
 		int alpha = hasAlpha ? parsePercentage( params.get( 3 ) ) : 100;
@@ -543,35 +644,38 @@ class UIDefaultsLoader
 	}
 
 	/**
-	 * Syntax: lighten([color,]amount[,options]) or darken([color,]amount[,options])
+	 * Syntax: lighten(color,amount[,options]) or darken(color,amount[,options]) or
+	 *         saturate(color,amount[,options]) or desaturate(color,amount[,options]) or
+	 *         fadein(color,amount[,options]) or fadeout(color,amount[,options])
 	 *   - color: a color (e.g. #f00) or a color function
 	 *   - amount: percentage 0-100%
-	 *   - options: [relative] [autoInverse] [lazy]
+	 *   - options: [relative] [autoInverse] [noAutoInverse] [lazy] [derived]
 	 */
-	private static Object parseColorLightenOrDarken( boolean lighten, List<String> params,
-		Function<String, String> resolver, boolean reportError )
+	private static Object parseColorHSLIncreaseDecrease( int hslIndex, boolean increase,
+		List<String> params, Function<String, String> resolver, boolean reportError )
 	{
-		boolean isDerived = params.get( 0 ).endsWith( "%" );
-		String colorStr = isDerived ? null : params.get( 0 );
-		int nextParam = isDerived ? 0 : 1;
-		int amount = parsePercentage( params.get( nextParam++ ) );
+		String colorStr = params.get( 0 );
+		int amount = parsePercentage( params.get( 1 ) );
 		boolean relative = false;
 		boolean autoInverse = false;
 		boolean lazy = false;
+		boolean derived = false;
 
-		if( params.size() > nextParam ) {
-			String options = params.get( nextParam++ );
+		if( params.size() > 2 ) {
+			String options = params.get( 2 );
 			relative = options.contains( "relative" );
 			autoInverse = options.contains( "autoInverse" );
 			lazy = options.contains( "lazy" );
+			derived = options.contains( "derived" );
+
+			// use autoInverse by default for derived colors, except if noAutoInverse is set
+			if( derived && !options.contains( "noAutoInverse" ) )
+				autoInverse = true;
 		}
 
-		ColorFunctions.ColorFunction function = lighten
-			? new ColorFunctions.Lighten( amount, relative, autoInverse )
-			: new ColorFunctions.Darken( amount, relative, autoInverse );
-
-		if( isDerived )
-			return new DerivedColor( function );
+		// create function
+		ColorFunction function = new ColorFunctions.HSLIncreaseDecrease(
+			hslIndex, increase, amount, relative, autoInverse );
 
 		if( lazy ) {
 			return (LazyValue) t -> {
@@ -582,8 +686,84 @@ class UIDefaultsLoader
 			};
 		}
 
-		ColorUIResource color = (ColorUIResource) parseColorOrFunction( resolver.apply( colorStr ), resolver, reportError );
-		return new ColorUIResource( ColorFunctions.applyFunctions( color, function ) );
+		// parse base color, apply function and create derived color
+		return parseFunctionBaseColor( colorStr, function, derived, resolver, reportError );
+	}
+
+	/**
+	 * Syntax: fade(color,amount[,options])
+	 *   - color: a color (e.g. #f00) or a color function
+	 *   - amount: percentage 0-100%
+	 *   - options: [derived]
+	 */
+	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;
+
+		if( params.size() > 2 ) {
+			String options = params.get( 2 );
+			derived = options.contains( "derived" );
+		}
+
+		// create function
+		ColorFunction function = new ColorFunctions.Fade( amount );
+
+		// parse base color, apply function and create derived color
+		return parseFunctionBaseColor( colorStr, function, derived, resolver, reportError );
+	}
+
+	/**
+	 * Syntax: spin(color,angle[,options])
+	 *   - color: a color (e.g. #f00) or a color function
+	 *   - angle: number of degrees to rotate
+	 *   - options: [derived]
+	 */
+	private static Object parseColorSpin( List<String> params, Function<String, String> resolver, boolean reportError ) {
+		String colorStr = params.get( 0 );
+		int amount = parseInteger( params.get( 1 ), true );
+		boolean derived = false;
+
+		if( params.size() > 2 ) {
+			String options = params.get( 2 );
+			derived = options.contains( "derived" );
+		}
+
+		// create function
+		ColorFunction function = new ColorFunctions.HSLIncreaseDecrease( 0, true, amount, false, false );
+
+		// parse base color, apply function and create derived color
+		return parseFunctionBaseColor( colorStr, function, derived, resolver, reportError );
+	}
+
+	private static Object parseFunctionBaseColor( String colorStr, ColorFunction function,
+		boolean derived, Function<String, String> resolver, boolean reportError )
+	{
+		// parse base color
+		String resolvedColorStr = resolver.apply( colorStr );
+		ColorUIResource baseColor = (ColorUIResource) parseColorOrFunction( resolvedColorStr, resolver, reportError );
+		if( baseColor == null )
+			return null;
+
+		// apply this function to base color
+		Color newColor = ColorFunctions.applyFunctions( baseColor, function );
+
+		if( derived ) {
+			ColorFunction[] functions;
+			if( baseColor instanceof DerivedColor && resolvedColorStr == colorStr ) {
+				// if the base color is also derived, join the color functions
+				// but only if base color function is specified directly in this function
+				ColorFunction[] baseFunctions = ((DerivedColor)baseColor).getFunctions();
+				functions = new ColorFunction[baseFunctions.length + 1];
+				System.arraycopy( baseFunctions, 0, functions, 0, baseFunctions.length );
+				functions[baseFunctions.length] = function;
+			} else
+				functions = new ColorFunction[] { function };
+
+			return new DerivedColor( newColor, functions );
+		}
+
+		return new ColorUIResource( newColor );
 	}
 
 	private static int parsePercentage( String value ) {
@@ -608,7 +788,12 @@ class UIDefaultsLoader
 		return value.charAt( 0 );
 	}
 
-	private static Integer parseInteger( String value, int min, int max ) {
+	private static Integer parseInteger( String value, int min, int max, boolean allowPercentage ) {
+		if( allowPercentage && value.endsWith( "%" ) ) {
+			int percent = parsePercentage( value );
+			return (max * percent) / 100;
+		}
+
 		Integer integer = parseInteger( value, true );
 		if( integer.intValue() < min || integer.intValue() > max )
 			throw new NumberFormatException( "integer '" + value + "' out of range (" + min + '-' + max + ')' );
@@ -663,6 +848,21 @@ class UIDefaultsLoader
 		};
 	}
 
+	private static Object parseGrayFilter( String value ) {
+		List<String> numbers = split( value, ',' );
+		try {
+			int brightness = Integer.parseInt( numbers.get( 0 ) );
+			int contrast = Integer.parseInt( numbers.get( 1 ) );
+			int alpha = Integer.parseInt( numbers.get( 2 ) );
+
+			return (LazyValue) t -> {
+				return new GrayFilter( brightness, contrast, alpha );
+			};
+		} catch( NumberFormatException ex ) {
+			throw new IllegalArgumentException( "invalid gray filter '" + value + "'" );
+		}
+	}
+
 	/**
 	 * Split string and trim parts.
 	 */

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

@@ -0,0 +1,55 @@
+/*
+ * Copyright 2020 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.Graphics;
+import java.awt.Graphics2D;
+import com.formdev.flatlaf.util.AnimatedIcon;
+
+/**
+ * Base class for animated icons that scales 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.
+ * This makes it possible to use a share icon instance for multiple components.
+ *
+ * @author Karl Tauber
+ */
+public abstract class FlatAnimatedIcon
+	extends FlatAbstractIcon
+	implements AnimatedIcon
+{
+	public FlatAnimatedIcon( int width, int height, Color color ) {
+		super( width, height, color );
+	}
+
+	@Override
+	public void paintIcon( Component c, Graphics g, int x, int y ) {
+		super.paintIcon( c, g, x, y );
+		AnimatedIcon.AnimationSupport.saveIconLocation( this, c, x, y );
+	}
+
+	@Override
+	protected void paintIcon( Component c, Graphics2D g ) {
+		AnimatedIcon.AnimationSupport.paintIcon( this, c, g, 0, 0 );
+	}
+}

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

@@ -27,7 +27,7 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
 /**
  * "ascendingSort" icon for {@link javax.swing.table.JTableHeader}.
  *
- * @uiDefault Component.arrowType				String	triangle (default) or chevron
+ * @uiDefault Component.arrowType				String	chevron (default) or triangle
  * @uiDefault Table.sortIconColor				Color
  *
  * @author Karl Tauber
@@ -35,7 +35,7 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
 public class FlatAscendingSortIcon
 	extends FlatAbstractIcon
 {
-	protected final boolean chevron = "chevron".equals( UIManager.getString( "Component.arrowType" ) );
+	protected final boolean chevron = FlatUIUtils.isChevron( UIManager.getString( "Component.arrowType" ) );
 	protected final Color sortIconColor = UIManager.getColor( "Table.sortIconColor" );
 
 	public FlatAscendingSortIcon() {

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

@@ -36,25 +36,28 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
  *       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 Component.focusWidth						int
  * @uiDefault Component.focusColor						Color
- * @uiDefault CheckBox.icon.focusedColor				Color	optional; defaults to Component.focusColor
+ * @uiDefault CheckBox.icon.focusWidth					int		optional; defaults to Component.focusWidth
+ * @uiDefault CheckBox.icon.focusColor					Color	optional; defaults to Component.focusColor
  * @uiDefault CheckBox.icon.borderColor					Color
- * @uiDefault CheckBox.icon.disabledBorderColor			Color
- * @uiDefault CheckBox.icon.selectedBorderColor			Color
- * @uiDefault CheckBox.icon.focusedBorderColor			Color
- * @uiDefault CheckBox.icon.hoverBorderColor			Color	optional
- * @uiDefault CheckBox.icon.selectedFocusedBorderColor	Color	optional
  * @uiDefault CheckBox.icon.background					Color
- * @uiDefault CheckBox.icon.disabledBackground			Color
- * @uiDefault CheckBox.icon.focusedBackground			Color	optional
- * @uiDefault CheckBox.icon.hoverBackground				Color	optional
- * @uiDefault CheckBox.icon.pressedBackground			Color	optional
+ * @uiDefault CheckBox.icon.selectedBorderColor			Color
  * @uiDefault CheckBox.icon.selectedBackground			Color
- * @uiDefault CheckBox.icon.selectedHoverBackground		Color	optional
- * @uiDefault CheckBox.icon.selectedPressedBackground	Color	optional
  * @uiDefault CheckBox.icon.checkmarkColor				Color
+ * @uiDefault CheckBox.icon.disabledBorderColor			Color
+ * @uiDefault CheckBox.icon.disabledBackground			Color
  * @uiDefault CheckBox.icon.disabledCheckmarkColor		Color
+ * @uiDefault CheckBox.icon.focusedBorderColor			Color
+ * @uiDefault CheckBox.icon.focusedBackground			Color	optional
+ * @uiDefault CheckBox.icon.selectedFocusedBorderColor	Color	optional
+ * @uiDefault CheckBox.icon.selectedFocusedBackground	Color	optional
+ * @uiDefault CheckBox.icon.hoverBorderColor			Color	optional
+ * @uiDefault CheckBox.icon.hoverBackground				Color	optional
+ * @uiDefault CheckBox.icon.selectedHoverBackground		Color	optional
+ * @uiDefault CheckBox.icon.pressedBackground			Color	optional
+ * @uiDefault CheckBox.icon.selectedPressedBackground	Color	optional
  * @uiDefault CheckBox.arc								int
  *
  * @author Karl Tauber
@@ -62,27 +65,62 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
 public class FlatCheckBoxIcon
 	extends FlatAbstractIcon
 {
-	public final int focusWidth = UIManager.getInt( "Component.focusWidth" );
-	protected final Color focusColor = FlatUIUtils.getUIColor( "CheckBox.icon.focusedColor",
+	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 Color borderColor = UIManager.getColor( "CheckBox.icon.borderColor" );
-	protected final Color disabledBorderColor = UIManager.getColor( "CheckBox.icon.disabledBorderColor" );
-	protected final Color selectedBorderColor = UIManager.getColor( "CheckBox.icon.selectedBorderColor" );
-	protected final Color focusedBorderColor = UIManager.getColor( "CheckBox.icon.focusedBorderColor" );
-	protected final Color hoverBorderColor = UIManager.getColor( "CheckBox.icon.hoverBorderColor" );
-	protected final Color selectedFocusedBorderColor = UIManager.getColor( "CheckBox.icon.selectedFocusedBorderColor" );
-	protected final Color background = UIManager.getColor( "CheckBox.icon.background" );
-	protected final Color disabledBackground = UIManager.getColor( "CheckBox.icon.disabledBackground" );
-	protected final Color focusedBackground = UIManager.getColor( "CheckBox.icon.focusedBackground" );
-	protected final Color hoverBackground = UIManager.getColor( "CheckBox.icon.hoverBackground" );
-	protected final Color pressedBackground = UIManager.getColor( "CheckBox.icon.pressedBackground" );
-	protected final Color selectedBackground = UIManager.getColor( "CheckBox.icon.selectedBackground" );
-	protected final Color selectedHoverBackground = UIManager.getColor( "CheckBox.icon.selectedHoverBackground" );
-	protected final Color selectedPressedBackground = UIManager.getColor( "CheckBox.icon.selectedPressedBackground" );
-	protected final Color checkmarkColor = UIManager.getColor( "CheckBox.icon.checkmarkColor" );
-	protected final Color disabledCheckmarkColor = UIManager.getColor( "CheckBox.icon.disabledCheckmarkColor" );
+	// 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 );
+
+	// 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 );
+
+	// 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 );
+
+	// 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 );
+
+	// pressed
+	protected final Color pressedBackground = getUIColor( "CheckBox.icon.pressedBackground", style );
+	protected final Color selectedPressedBackground = getUIColor( "CheckBox.icon.selectedPressedBackground", style );
+
+	protected static Color getUIColor( String key, String style ) {
+		if( style != null ) {
+			Color color = UIManager.getColor( styleKey( key, style ) );
+			if( color != null )
+				return color;
+		}
+		return UIManager.getColor( key );
+	}
+
+	protected static int getUIInt( String key, int defaultValue, String style ) {
+		if( style != null ) {
+			Object value = UIManager.get( styleKey( key, style ) );
+			if( value instanceof Integer )
+				return (Integer) value;
+		}
+		return FlatUIUtils.getUIInt( key, defaultValue );
+	}
+
+	private static String styleKey( String key, String style ) {
+		return key.replace( ".icon.", ".icon[" + style + "]." );
+	}
 
 	static final int ICON_SIZE = 15;
 
@@ -91,73 +129,101 @@ public class FlatCheckBoxIcon
 	}
 
 	@Override
-	protected void paintIcon( Component c, Graphics2D g2 ) {
-		boolean indeterminate = c instanceof JComponent && clientPropertyEquals( (JComponent) c, SELECTED_STATE, SELECTED_STATE_INDETERMINATE );
-		boolean selected = indeterminate || (c instanceof AbstractButton && ((AbstractButton)c).isSelected());
+	protected void paintIcon( Component c, Graphics2D g ) {
+		boolean indeterminate = isIndeterminate( c );
+		boolean selected = indeterminate || isSelected( c );
+		boolean isFocused = FlatUIUtils.isPermanentFocusOwner( c );
 
 		// paint focused border
-		if( c.hasFocus() && focusWidth > 0 ) {
-			g2.setColor( focusColor );
-			paintFocusBorder( g2 );
+		if( isFocused && focusWidth > 0 && FlatButtonUI.isFocusPainted( c ) ) {
+			g.setColor( getFocusColor( c ) );
+			paintFocusBorder( c, g );
 		}
 
 		// paint border
-		g2.setColor( FlatButtonUI.buttonStateColor( c,
-			selected ? selectedBorderColor : borderColor,
-			disabledBorderColor,
-			selected && selectedFocusedBorderColor != null ? selectedFocusedBorderColor : focusedBorderColor,
-			hoverBorderColor,
-			null ) );
-		paintBorder( g2 );
+		g.setColor( getBorderColor( c, selected ) );
+		paintBorder( c, g );
 
 		// paint background
-		FlatUIUtils.setColor( g2, FlatButtonUI.buttonStateColor( c,
-			selected ? selectedBackground : background,
-			disabledBackground,
-			focusedBackground,
-			selected && selectedHoverBackground != null ? selectedHoverBackground : hoverBackground,
-			selected && selectedPressedBackground != null ? selectedPressedBackground : pressedBackground ),
-			background );
-		paintBackground( g2 );
+		g.setColor( FlatUIUtils.deriveColor( getBackground( c, selected ), background ) );
+		paintBackground( c, g );
 
 		// paint checkmark
 		if( selected || indeterminate ) {
-			g2.setColor( c.isEnabled() ? checkmarkColor : disabledCheckmarkColor );
+			g.setColor( getCheckmarkColor( c, selected, isFocused ) );
 			if( indeterminate )
-				paintIndeterminate( g2 );
+				paintIndeterminate( c, g );
 			else
-				paintCheckmark( g2 );
+				paintCheckmark( c, g );
 		}
 	}
 
-	protected void paintFocusBorder( Graphics2D g2 ) {
+	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);
-		g2.fillRoundRect( -focusWidth + 1, -focusWidth, wh, wh, arcwh, arcwh );
+		g.fillRoundRect( -focusWidth + 1, -focusWidth, wh, wh, arcwh, arcwh );
 	}
 
-	protected void paintBorder( Graphics2D g2 ) {
+	protected void paintBorder( Component c, Graphics2D g ) {
 		int arcwh = arc;
-		g2.fillRoundRect( 1, 0, 14, 14, arcwh, arcwh );
+		g.fillRoundRect( 1, 0, 14, 14, arcwh, arcwh );
 	}
 
-	protected void paintBackground( Graphics2D g2 ) {
+	protected void paintBackground( Component c, Graphics2D g ) {
 		int arcwh = arc - 1;
-		g2.fillRoundRect( 2, 1, 12, 12, arcwh, arcwh );
+		g.fillRoundRect( 2, 1, 12, 12, arcwh, arcwh );
 	}
 
-	protected void paintCheckmark( Graphics2D g2 ) {
+	protected void paintCheckmark( Component c, Graphics2D g ) {
 		Path2D.Float path = new Path2D.Float();
 		path.moveTo( 4.5f, 7.5f );
 		path.lineTo( 6.6f, 10f );
 		path.lineTo( 11.25f, 3.5f );
 
-		g2.setStroke( new BasicStroke( 1.9f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND ) );
-		g2.draw( path );
+		g.setStroke( new BasicStroke( 1.9f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND ) );
+		g.draw( path );
 	}
 
-	protected void paintIndeterminate( Graphics2D g2 ) {
-		g2.fill( new RoundRectangle2D.Float( 3.75f, 5.75f, 8.5f, 2.5f, 2f, 2f ) );
+	protected void paintIndeterminate( Component c, Graphics2D g ) {
+		g.fill( new RoundRectangle2D.Float( 3.75f, 5.75f, 8.5f, 2.5f, 2f, 2f ) );
+	}
+
+	protected boolean isIndeterminate( Component c ) {
+		return c instanceof JComponent && clientPropertyEquals( (JComponent) c, SELECTED_STATE, SELECTED_STATE_INDETERMINATE );
+	}
+
+	protected boolean isSelected( Component c ) {
+		return c instanceof AbstractButton && ((AbstractButton)c).isSelected();
+	}
+
+	protected Color getFocusColor( Component c ) {
+		return focusColor;
+	}
+
+	protected Color getBorderColor( Component c, boolean selected ) {
+		return FlatButtonUI.buttonStateColor( c,
+			selected ? selectedBorderColor : borderColor,
+			disabledBorderColor,
+			selected && selectedFocusedBorderColor != null ? selectedFocusedBorderColor : focusedBorderColor,
+			hoverBorderColor,
+			null );
+	}
+
+	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 );
+	}
+
+	protected Color getCheckmarkColor( Component c, boolean selected, boolean isFocused ) {
+		return c.isEnabled()
+			? ((selected && isFocused && selectedFocusedCheckmarkColor != null)
+				? selectedFocusedCheckmarkColor
+				: checkmarkColor)
+			: disabledCheckmarkColor;
 	}
 }

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

@@ -30,7 +30,8 @@ import javax.swing.UIManager;
  *
  * @uiDefault MenuItemCheckBox.icon.checkmarkColor				Color
  * @uiDefault MenuItemCheckBox.icon.disabledCheckmarkColor		Color
- * @uiDefault Menu.selectionForeground							Color
+ * @uiDefault MenuItem.selectionForeground						Color
+ * @uiDefault MenuItem.selectionType							String
  *
  * @author Karl Tauber
  */
@@ -39,7 +40,7 @@ public class FlatCheckBoxMenuItemIcon
 {
 	protected final Color checkmarkColor = UIManager.getColor( "MenuItemCheckBox.icon.checkmarkColor" );
 	protected final Color disabledCheckmarkColor = UIManager.getColor( "MenuItemCheckBox.icon.disabledCheckmarkColor" );
-	protected final Color selectionForeground = UIManager.getColor( "Menu.selectionForeground" );
+	protected final Color selectionForeground = UIManager.getColor( "MenuItem.selectionForeground" );
 
 	public FlatCheckBoxMenuItemIcon() {
 		super( 15, 15, null );
@@ -66,10 +67,15 @@ public class FlatCheckBoxMenuItemIcon
 		g2.draw( path );
 	}
 
-	private Color getCheckmarkColor( Component c ) {
-		if( c instanceof JMenuItem && ((JMenuItem)c).isArmed() )
+	protected Color getCheckmarkColor( Component c ) {
+		if( c instanceof JMenuItem && ((JMenuItem)c).isArmed() && !isUnderlineSelection() )
 			return selectionForeground;
 
 		return c.isEnabled() ? checkmarkColor : disabledCheckmarkColor;
 	}
+
+	protected boolean isUnderlineSelection() {
+		// not storing value of "MenuItem.selectionType" in class to allow changing at runtime
+		return "underline".equals( UIManager.getString( "MenuItem.selectionType" ) );
+	}
 }

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

@@ -27,7 +27,7 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
 /**
  * "descendingSort" icon for {@link javax.swing.table.JTableHeader}.
  *
- * @uiDefault Component.arrowType				String	triangle (default) or chevron
+ * @uiDefault Component.arrowType				String	chevron (default) or triangle
  * @uiDefault Table.sortIconColor				Color
  *
  * @author Karl Tauber
@@ -35,7 +35,7 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
 public class FlatDescendingSortIcon
 	extends FlatAbstractIcon
 {
-	protected final boolean chevron = "chevron".equals( UIManager.getString( "Component.arrowType" ) );
+	protected final boolean chevron = FlatUIUtils.isChevron( UIManager.getString( "Component.arrowType" ) );
 	protected final Color sortIconColor = UIManager.getColor( "Table.sortIconColor" );
 
 	public FlatDescendingSortIcon() {

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

@@ -82,10 +82,10 @@ public class FlatHelpButtonIcon
 		*/
 
 		boolean enabled = c.isEnabled();
-		boolean focused = c.hasFocus();
+		boolean focused = FlatUIUtils.isPermanentFocusOwner( c );
 
 		// paint focused border
-		if( focused ) {
+		if( focused && FlatButtonUI.isFocusPainted( c ) ) {
 			g2.setColor( focusColor );
 			g2.fill( new Ellipse2D.Float( 0.5f, 0.5f, iconSize - 1, iconSize - 1 ) );
 		}
@@ -100,12 +100,12 @@ public class FlatHelpButtonIcon
 		g2.fill( new Ellipse2D.Float( focusWidth + 0.5f, focusWidth + 0.5f, 21, 21 ) );
 
 		// paint background
-		FlatUIUtils.setColor( g2, FlatButtonUI.buttonStateColor( c,
+		g2.setColor( FlatUIUtils.deriveColor( FlatButtonUI.buttonStateColor( c,
 			background,
 			disabledBackground,
 			focusedBackground,
 			hoverBackground,
-			pressedBackground ), background );
+			pressedBackground ), background ) );
 		g2.fill( new Ellipse2D.Float( focusWidth + 1.5f, focusWidth + 1.5f, 19, 19 ) );
 
 		// paint question mark

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

@@ -27,6 +27,7 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
 /**
  * Base class for internal frame icons.
  *
+ * @uiDefault InternalFrame.buttonSize					Dimension
  * @uiDefault InternalFrame.buttonHoverBackground		Color
  * @uiDefault InternalFrame.buttonPressedBackground		Color
  *
@@ -53,7 +54,7 @@ public abstract class FlatInternalFrameAbstractIcon
 	protected void paintBackground( Component c, Graphics2D g ) {
 		Color background = FlatButtonUI.buttonStateColor( c, null, null, null, hoverBackground, pressedBackground );
 		if( background != null ) {
-			FlatUIUtils.setColor( g, background, c.getBackground() );
+			g.setColor( FlatUIUtils.deriveColor( background, c.getBackground() ) );
 			g.fillRect( 0, 0, width, height );
 		}
 	}

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

@@ -28,8 +28,11 @@ import com.formdev.flatlaf.ui.FlatButtonUI;
 /**
  * "close" icon for {@link javax.swing.JInternalFrame}.
  *
- * @uiDefault InternalFrame.buttonHoverBackground		Color
- * @uiDefault InternalFrame.buttonPressedBackground		Color
+ * @uiDefault InternalFrame.buttonSize					Dimension
+ * @uiDefault InternalFrame.closeHoverBackground		Color
+ * @uiDefault InternalFrame.closePressedBackground		Color
+ * @uiDefault InternalFrame.closeHoverForeground		Color
+ * @uiDefault InternalFrame.closePressedForeground		Color
  *
  * @author Karl Tauber
  */

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

@@ -24,14 +24,14 @@ import java.awt.geom.Rectangle2D;
 import com.formdev.flatlaf.ui.FlatUIUtils;
 
 /**
- * "minimize" (actually "restore") icon for {@link javax.swing.JInternalFrame}.
+ * "restore" (or "minimize") icon for {@link javax.swing.JInternalFrame}.
  *
  * @author Karl Tauber
  */
-public class FlatInternalFrameMinimizeIcon
+public class FlatInternalFrameRestoreIcon
 	extends FlatInternalFrameAbstractIcon
 {
-	public FlatInternalFrameMinimizeIcon() {
+	public FlatInternalFrameRestoreIcon() {
 	}
 
 	@Override

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

@@ -28,17 +28,18 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
 /**
  * "arrow" icon for {@link javax.swing.JMenu}.
  *
- * @uiDefault Component.arrowType				String	triangle (default) or chevron
+ * @uiDefault Component.arrowType				String	chevron (default) or triangle
  * @uiDefault Menu.icon.arrowColor				Color
  * @uiDefault Menu.icon.disabledArrowColor		Color
  * @uiDefault Menu.selectionForeground			Color
+ * @uiDefault MenuItem.selectionType			String
  *
  * @author Karl Tauber
  */
 public class FlatMenuArrowIcon
 	extends FlatAbstractIcon
 {
-	protected final boolean chevron = "chevron".equals( UIManager.getString( "Component.arrowType" ) );
+	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" );
@@ -64,10 +65,15 @@ public class FlatMenuArrowIcon
 		}
 	}
 
-	private Color getArrowColor( Component c ) {
-		if( c instanceof JMenu && ((JMenu)c).isSelected() )
+	protected Color getArrowColor( Component c ) {
+		if( c instanceof JMenu && ((JMenu)c).isSelected() && !isUnderlineSelection() )
 			return selectionForeground;
 
 		return c.isEnabled() ? arrowColor : disabledArrowColor;
 	}
+
+	protected boolean isUnderlineSelection() {
+		// not storing value of "MenuItem.selectionType" in class to allow changing at runtime
+		return "underline".equals( UIManager.getString( "MenuItem.selectionType" ) );
+	}
 }

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

@@ -16,9 +16,9 @@
 
 package com.formdev.flatlaf.icons;
 
+import java.awt.Component;
 import java.awt.Graphics2D;
 import java.awt.geom.Ellipse2D;
-import com.formdev.flatlaf.ui.FlatUIUtils;
 
 /**
  * Icon for {@link javax.swing.JRadioButton}.
@@ -34,28 +34,28 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
 public class FlatRadioButtonIcon
 	extends FlatCheckBoxIcon
 {
-	protected final int centerDiameter = FlatUIUtils.getUIInt( "RadioButton.icon.centerDiameter", 8 );
+	protected final int centerDiameter = getUIInt( "RadioButton.icon.centerDiameter", 8, style );
 
 	@Override
-	protected void paintFocusBorder( Graphics2D g2 ) {
+	protected void paintFocusBorder( Component c, Graphics2D g ) {
 		// the outline focus border is painted outside of the icon
 		int wh = ICON_SIZE + (focusWidth * 2);
-		g2.fillOval( -focusWidth, -focusWidth, wh, wh );
+		g.fillOval( -focusWidth, -focusWidth, wh, wh );
 	}
 
 	@Override
-	protected void paintBorder( Graphics2D g2 ) {
-		g2.fillOval( 0, 0, 15, 15 );
+	protected void paintBorder( Component c, Graphics2D g ) {
+		g.fillOval( 0, 0, 15, 15 );
 	}
 
 	@Override
-	protected void paintBackground( Graphics2D g2 ) {
-		g2.fillOval( 1, 1, 13, 13 );
+	protected void paintBackground( Component c, Graphics2D g ) {
+		g.fillOval( 1, 1, 13, 13 );
 	}
 
 	@Override
-	protected void paintCheckmark( Graphics2D g2 ) {
+	protected void paintCheckmark( Component c, Graphics2D g ) {
 		float xy = (ICON_SIZE - centerDiameter) / 2f;
-		g2.fill( new Ellipse2D.Float( xy, xy, centerDiameter, centerDiameter ) );
+		g.fill( new Ellipse2D.Float( xy, xy, centerDiameter, centerDiameter ) );
 	}
 }

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

@@ -0,0 +1,91 @@
+/*
+ * Copyright 2020 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.BasicStroke;
+import java.awt.Color;
+import java.awt.Component;
+import java.awt.Dimension;
+import java.awt.Graphics2D;
+import java.awt.geom.Line2D;
+import java.awt.geom.Path2D;
+import javax.swing.UIManager;
+import com.formdev.flatlaf.ui.FlatButtonUI;
+import com.formdev.flatlaf.ui.FlatUIUtils;
+
+/**
+ * "close" icon for closable tabs in {@link javax.swing.JTabbedPane}.
+ *
+ * @uiDefault TabbedPane.closeSize						Dimension
+ * @uiDefault TabbedPane.closeArc						int
+ * @uiDefault TabbedPane.closeCrossPlainSize			float
+ * @uiDefault TabbedPane.closeCrossFilledSize			float
+ * @uiDefault TabbedPane.closeCrossLineWidth			float
+ * @uiDefault TabbedPane.closeBackground				Color
+ * @uiDefault TabbedPane.closeForeground				Color
+ * @uiDefault TabbedPane.closeHoverBackground			Color
+ * @uiDefault TabbedPane.closeHoverForeground			Color
+ * @uiDefault TabbedPane.closePressedBackground			Color
+ * @uiDefault TabbedPane.closePressedForeground			Color
+ *
+ * @author Karl Tauber
+ */
+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" );
+
+	public FlatTabbedPaneCloseIcon() {
+		super( 16, 16, null );
+	}
+
+	@Override
+	protected void paintIcon( Component c, Graphics2D g ) {
+		// paint background
+		Color bg = FlatButtonUI.buttonStateColor( c, background, null, null, hoverBackground, pressedBackground );
+		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 );
+		}
+
+		// set cross color
+		Color fg = FlatButtonUI.buttonStateColor( c, foreground, null, null, hoverForeground, pressedForeground );
+		g.setColor( FlatUIUtils.deriveColor( fg, c.getForeground() ) );
+
+		float mx = width / 2;
+		float my = height / 2;
+		float r = ((bg != null) ? crossFilledSize : crossPlainSize) / 2;
+
+		// paint cross
+		Path2D path = new Path2D.Float( Path2D.WIND_EVEN_ODD );
+		path.append( new Line2D.Float( mx - r, my - r, mx + r, my + r ), false );
+		path.append( new Line2D.Float( mx - r, my + r, mx + r, my - r ), false );
+		g.setStroke( new BasicStroke( closeCrossLineWidth ) );
+		g.draw( path );
+	}
+}

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

@@ -25,7 +25,7 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
 /**
  * "collapsed" icon for {@link javax.swing.JTree}.
  *
- * @uiDefault Component.arrowType				String	triangle (default) or chevron
+ * @uiDefault Component.arrowType				String	chevron (default) or triangle
  * @uiDefault Tree.icon.collapsedColor			Color
  *
  * @author Karl Tauber
@@ -41,7 +41,7 @@ public class FlatTreeCollapsedIcon
 
 	FlatTreeCollapsedIcon( Color color ) {
 		super( 11, 11, color );
-		chevron = "chevron".equals( UIManager.getString( "Component.arrowType" ) );
+		chevron = FlatUIUtils.isChevron( UIManager.getString( "Component.arrowType" ) );
 	}
 
 	@Override

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

@@ -0,0 +1,76 @@
+/*
+ * Copyright 2020 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.Dimension;
+import java.awt.Graphics2D;
+import javax.swing.UIManager;
+import com.formdev.flatlaf.ui.FlatButtonUI;
+import com.formdev.flatlaf.ui.FlatUIUtils;
+import com.formdev.flatlaf.util.HiDPIUtils;
+
+/**
+ * Base class for window icons.
+ *
+ * @uiDefault TitlePane.buttonSize						Dimension
+ * @uiDefault TitlePane.buttonHoverBackground			Color
+ * @uiDefault TitlePane.buttonPressedBackground			Color
+ *
+ * @author Karl Tauber
+ */
+public abstract class FlatWindowAbstractIcon
+	extends FlatAbstractIcon
+{
+	private final Color hoverBackground;
+	private final Color pressedBackground;
+
+	public FlatWindowAbstractIcon() {
+		this( UIManager.getDimension( "TitlePane.buttonSize" ),
+			UIManager.getColor( "TitlePane.buttonHoverBackground" ),
+			UIManager.getColor( "TitlePane.buttonPressedBackground" ) );
+	}
+
+	public FlatWindowAbstractIcon( Dimension size, Color hoverBackground, Color pressedBackground ) {
+		super( size.width, size.height, null );
+		this.hoverBackground = hoverBackground;
+		this.pressedBackground = pressedBackground;
+	}
+
+	@Override
+	protected void paintIcon( Component c, Graphics2D g ) {
+		paintBackground( c, g );
+
+		g.setColor( getForeground( c ) );
+		HiDPIUtils.paintAtScale1x( g, 0, 0, width, height, this::paintIconAt1x );
+	}
+
+	protected abstract void paintIconAt1x( Graphics2D g, int x, int y, int width, int height, double scaleFactor );
+
+	protected void paintBackground( Component c, Graphics2D g ) {
+		Color background = FlatButtonUI.buttonStateColor( c, null, null, null, hoverBackground, pressedBackground );
+		if( background != null ) {
+			g.setColor( FlatUIUtils.deriveColor( background, c.getBackground() ) );
+			g.fillRect( 0, 0, width, height );
+		}
+	}
+
+	protected Color getForeground( Component c ) {
+		return c.getForeground();
+	}
+}

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

@@ -0,0 +1,70 @@
+/*
+ * Copyright 2020 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.BasicStroke;
+import java.awt.Color;
+import java.awt.Component;
+import java.awt.Graphics2D;
+import java.awt.geom.Line2D;
+import java.awt.geom.Path2D;
+import javax.swing.UIManager;
+import com.formdev.flatlaf.ui.FlatButtonUI;
+
+/**
+ * "close" icon for windows (frames and dialogs).
+ *
+ * @uiDefault TitlePane.closeHoverBackground			Color
+ * @uiDefault TitlePane.closePressedBackground			Color
+ * @uiDefault TitlePane.closeHoverForeground			Color
+ * @uiDefault TitlePane.closePressedForeground			Color
+ *
+ * @author Karl Tauber
+ */
+public class FlatWindowCloseIcon
+	extends FlatWindowAbstractIcon
+{
+	private final Color hoverForeground = UIManager.getColor( "TitlePane.closeHoverForeground" );
+	private final Color pressedForeground = UIManager.getColor( "TitlePane.closePressedForeground" );
+
+	public FlatWindowCloseIcon() {
+		super( UIManager.getDimension( "TitlePane.buttonSize" ),
+			UIManager.getColor( "TitlePane.closeHoverBackground" ),
+			UIManager.getColor( "TitlePane.closePressedBackground" ) );
+	}
+
+	@Override
+	protected void paintIconAt1x( Graphics2D g, int x, int y, int width, int height, double scaleFactor ) {
+		int iwh = (int) (10 * scaleFactor);
+		int ix = x + ((width - iwh) / 2);
+		int iy = y + ((height - iwh) / 2);
+		int ix2 = ix + iwh - 1;
+		int iy2 = iy + iwh - 1;
+		int thickness = (int) scaleFactor;
+
+		Path2D path = new Path2D.Float( Path2D.WIND_EVEN_ODD );
+		path.append( new Line2D.Float( ix, iy, ix2, iy2 ), false );
+		path.append( new Line2D.Float( ix, iy2, ix2, iy ), false );
+		g.setStroke( new BasicStroke( thickness ) );
+		g.draw( path );
+	}
+
+	@Override
+	protected Color getForeground( Component c ) {
+		return FlatButtonUI.buttonStateColor( c, c.getForeground(), null, null, hoverForeground, pressedForeground );
+	}
+}

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

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2020 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.Graphics2D;
+
+/**
+ * "iconify" icon for windows (frames and dialogs).
+ *
+ * @author Karl Tauber
+ */
+public class FlatWindowIconifyIcon
+	extends FlatWindowAbstractIcon
+{
+	public FlatWindowIconifyIcon() {
+	}
+
+	@Override
+	protected void paintIconAt1x( Graphics2D g, int x, int y, int width, int height, double scaleFactor ) {
+		int iw = (int) (10 * scaleFactor);
+		int ih = (int) scaleFactor;
+		int ix = x + ((width - iw) / 2);
+		int iy = y + ((height - ih) / 2);
+
+		g.fillRect( ix, iy, iw, ih );
+	}
+}

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

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2020 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.Graphics2D;
+import com.formdev.flatlaf.ui.FlatUIUtils;
+
+/**
+ * "maximize" icon for windows (frames and dialogs).
+ *
+ * @author Karl Tauber
+ */
+public class FlatWindowMaximizeIcon
+	extends FlatWindowAbstractIcon
+{
+	public FlatWindowMaximizeIcon() {
+	}
+
+	@Override
+	protected void paintIconAt1x( Graphics2D g, int x, int y, int width, int height, double scaleFactor ) {
+		int iwh = (int) (10 * scaleFactor);
+		int ix = x + ((width - iwh) / 2);
+		int iy = y + ((height - iwh) / 2);
+		int thickness = (int) scaleFactor;
+
+		g.fill( FlatUIUtils.createRectangle( ix, iy, iwh, iwh, thickness ) );
+	}
+}

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

@@ -0,0 +1,55 @@
+/*
+ * Copyright 2020 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.Graphics2D;
+import java.awt.geom.Area;
+import java.awt.geom.Path2D;
+import java.awt.geom.Rectangle2D;
+import com.formdev.flatlaf.ui.FlatUIUtils;
+
+/**
+ * "restore" icon for windows (frames and dialogs).
+ *
+ * @author Karl Tauber
+ */
+public class FlatWindowRestoreIcon
+	extends FlatWindowAbstractIcon
+{
+	public FlatWindowRestoreIcon() {
+	}
+
+	@Override
+	protected void paintIconAt1x( Graphics2D g, int x, int y, int width, int height, double scaleFactor ) {
+		int iwh = (int) (10 * scaleFactor);
+		int ix = x + ((width - iwh) / 2);
+		int iy = y + ((height - iwh) / 2);
+		int thickness = (int) 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 );
+
+		Area area = new Area( r1 );
+		area.subtract( new Area( new Rectangle2D.Float( ix, iy + ro2, rwh, rwh ) ) );
+		g.fill( area );
+
+		g.fill( r2 );
+	}
+}

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

@@ -19,6 +19,7 @@ package com.formdev.flatlaf.ui;
 import static com.formdev.flatlaf.util.UIScale.scale;
 import java.awt.BasicStroke;
 import java.awt.Color;
+import java.awt.Container;
 import java.awt.Dimension;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
@@ -26,6 +27,7 @@ import java.awt.Shape;
 import java.awt.event.MouseAdapter;
 import java.awt.event.MouseEvent;
 import java.awt.geom.Path2D;
+import javax.swing.JComponent;
 import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicArrowButton;
 
@@ -40,33 +42,50 @@ public class FlatArrowButton
 {
 	public static final int DEFAULT_ARROW_WIDTH = 8;
 
-	private final boolean chevron;
-	private final Color foreground;
-	private final Color disabledForeground;
-	private final Color hoverForeground;
-	private final Color hoverBackground;
+	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;
 
 	private int arrowWidth = DEFAULT_ARROW_WIDTH;
 	private int xOffset = 0;
 	private int yOffset = 0;
 
 	private boolean hover;
+	private boolean pressed;
 
 	public FlatArrowButton( int direction, String type, Color foreground, Color disabledForeground,
 		Color hoverForeground, Color hoverBackground )
+	{
+		this( direction, type, foreground, disabledForeground, hoverForeground, hoverBackground, null );
+	}
+
+	public FlatArrowButton( int direction, String type, Color foreground, Color disabledForeground,
+		Color hoverForeground, Color hoverBackground, Color pressedBackground )
+	{
+		this( direction, type, foreground, disabledForeground, hoverForeground, hoverBackground, null, pressedBackground );
+	}
+
+	public FlatArrowButton( int direction, String type, Color foreground, Color disabledForeground,
+		Color hoverForeground, Color hoverBackground, Color pressedForeground, Color pressedBackground )
 	{
 		super( direction, Color.WHITE, Color.WHITE, Color.WHITE, Color.WHITE );
 
-		this.chevron = "chevron".equals( type );
+		this.chevron = FlatUIUtils.isChevron( type );
 		this.foreground = foreground;
 		this.disabledForeground = disabledForeground;
 		this.hoverForeground = hoverForeground;
 		this.hoverBackground = hoverBackground;
+		this.pressedForeground = pressedForeground;
+		this.pressedBackground = pressedBackground;
 
 		setOpaque( false );
 		setBorder( null );
 
-		if( hoverForeground != null || hoverBackground != null ) {
+		if( hoverForeground != null || hoverBackground != null || pressedBackground != null ) {
 			addMouseListener( new MouseAdapter() {
 				@Override
 				public void mouseEntered( MouseEvent e ) {
@@ -79,6 +98,18 @@ public class FlatArrowButton
 					hover = false;
 					repaint();
 				}
+
+				@Override
+				public void mousePressed( MouseEvent e ) {
+					pressed = true;
+					repaint();
+				}
+
+				@Override
+				public void mouseReleased( MouseEvent e ) {
+					pressed = false;
+					repaint();
+				}
 			} );
 		}
 	}
@@ -95,6 +126,10 @@ public class FlatArrowButton
 		return hover;
 	}
 
+	protected boolean isPressed() {
+		return pressed;
+	}
+
 	public int getXOffset() {
 		return xOffset;
 	}
@@ -111,6 +146,14 @@ public class FlatArrowButton
 		this.yOffset = yOffset;
 	}
 
+	protected Color deriveBackground( Color background ) {
+		return background;
+	}
+
+	protected Color deriveForeground( Color foreground ) {
+		return foreground;
+	}
+
 	@Override
 	public Dimension getPreferredSize() {
 		return scale( super.getPreferredSize() );
@@ -123,47 +166,78 @@ public class FlatArrowButton
 
 	@Override
 	public void paint( Graphics g ) {
-		Graphics2D g2 = (Graphics2D)g;
-		FlatUIUtils.setRenderingHints( g2 );
+		Object[] oldRenderingHints = FlatUIUtils.setRenderingHints( g );
 
-		int width = getWidth();
-		int height = getHeight();
-		boolean enabled = isEnabled();
+		// paint hover or pressed background
+		if( isEnabled() ) {
+			Color background = (pressedBackground != null && isPressed())
+				? pressedBackground
+				: (hoverBackground != null && isHover()
+					? hoverBackground
+					: null);
 
-		// paint hover background
-		if( enabled && isHover() && hoverBackground != null ) {
-			g.setColor( hoverBackground );
-			g.fillRect( 0, 0, width, height );
+			if( background != null ) {
+				g.setColor( deriveBackground( background ) );
+				paintBackground( (Graphics2D) g );
+			}
 		}
 
+		// paint arrow
+		g.setColor( deriveForeground( isEnabled()
+			? (pressedForeground != null && isPressed()
+				? pressedForeground
+				: (hoverForeground != null && isHover()
+					? hoverForeground
+					: foreground))
+			: disabledForeground ) );
+		paintArrow( (Graphics2D) g );
+
+		FlatUIUtils.resetRenderingHints( g, oldRenderingHints );
+	}
+
+	protected void paintBackground( Graphics2D g ) {
+		g.fillRect( 0, 0, getWidth(), getHeight() );
+	}
+
+	protected void paintArrow( Graphics2D g ) {
 		int direction = getDirection();
 		boolean vert = (direction == NORTH || direction == SOUTH);
 
+		// compute width/height
 		int w = scale( arrowWidth + (chevron ? 0 : 1) );
 		int h = scale( (arrowWidth / 2) + (chevron ? 0 : 1) );
+
+		// rotate width/height
 		int rw = vert ? w : h;
 		int rh = vert ? h : w;
-		int x = Math.round( (width - rw) / 2f + scale( (float) xOffset ) );
-		int y = Math.round( (height - rh) / 2f + scale( (float) yOffset ) );
 
-		// optimization for small chevron arrows (e.g. OneTouchButtons in SplitPane)
-		if( x + rw >= width && x > 0 )
-			x--;
-		if( y + rh >= height && y > 0 )
-			y--;
+		// chevron lines end 1px outside of width/height
+		if( chevron ) {
+			// add 1px to width/height for position calculation only
+			rw++;
+			rh++;
+		}
+
+		int x = Math.round( (getWidth() - rw) / 2f + scale( (float) xOffset ) );
+		int y = Math.round( (getHeight() - rh) / 2f + scale( (float) yOffset ) );
+
+		// move arrow for round borders
+		Container parent = getParent();
+		if( vert && parent instanceof JComponent && FlatUIUtils.hasRoundBorder( (JComponent) parent ) )
+			x -= scale( parent.getComponentOrientation().isLeftToRight() ? 1 : -1 );
 
 		// paint arrow
-		g.setColor( enabled
-			? (isHover() && hoverForeground != null ? hoverForeground : foreground)
-			: disabledForeground );
 		g.translate( x, y );
+/*debug
+		debugPaint( g, vert, rw, rh );
+debug*/
 		Shape arrowShape = createArrowShape( direction, chevron, w, h );
 		if( chevron ) {
-			g2.setStroke( new BasicStroke( scale( 1f ) ) );
-			g2.draw( arrowShape );
+			g.setStroke( new BasicStroke( scale( 1f ) ) );
+			g.draw( arrowShape );
 		} else {
 			// triangle
-			g2.fill( arrowShape );
+			g.fill( arrowShape );
 		}
 		g.translate( -x, -y );
 	}
@@ -177,4 +251,22 @@ public class FlatArrowButton
 			default:	return new Path2D.Float();
 		}
 	}
+
+/*debug
+	private void debugPaint( Graphics g, boolean vert, int w, int h ) {
+		Color oldColor = g.getColor();
+		g.setColor( Color.red );
+		g.drawRect( 0, 0, w - 1, h - 1 );
+
+		int xy1 = -2;
+		int xy2 = h + 1;
+		for( int i = 0; i < 20; i++ ) {
+			g.drawRect( vert ? 0 : xy1, vert ? xy1 : 0, 0, 0 );
+			g.drawRect( vert ? 0 : xy2, vert ? xy2 : 0, 0, 0 );
+			xy1 -= 2;
+			xy2 += 2;
+		}
+		g.setColor( oldColor );
+	}
+debug*/
 }

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

@@ -36,23 +36,31 @@ import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
 import javax.swing.plaf.basic.BasicBorders;
 import javax.swing.text.JTextComponent;
+import com.formdev.flatlaf.FlatClientProperties;
+import com.formdev.flatlaf.util.DerivedColor;
 
 /**
  * Border for various components (e.g. {@link javax.swing.JTextField}).
  *
  * There is empty space around the component border, if Component.focusWidth is greater than zero,
- * which is used to paint focus border.
+ * which is used to paint outer focus border.
  *
- * Because there is empty space (if focus border is not painted),
+ * 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.
  *
- * @uiDefault Component.focusWidth			int
- * @uiDefault Component.innerFocusWidth		int or float
- * @uiDefault Component.focusColor			Color
- * @uiDefault Component.borderColor			Color
- * @uiDefault Component.disabledBorderColor	Color
- * @uiDefault Component.focusedBorderColor	Color
+ * @uiDefault Component.focusWidth						int
+ * @uiDefault Component.innerFocusWidth					int or float
+ * @uiDefault Component.focusColor						Color
+ * @uiDefault Component.borderColor						Color
+ * @uiDefault Component.disabledBorderColor				Color
+ * @uiDefault Component.focusedBorderColor				Color
+ *
+ * @uiDefault Component.error.borderColor				Color
+ * @uiDefault Component.error.focusedBorderColor		Color
+ * @uiDefault Component.warning.borderColor				Color
+ * @uiDefault Component.warning.focusedBorderColor		Color
+ * @uiDefault Component.custom.borderColor				Color
  *
  * @author Karl Tauber
  */
@@ -61,37 +69,77 @@ public class FlatBorder
 {
 	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" );
 
+	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" );
+
 	@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 );
 
-			boolean isCellEditor = isTableCellEditor( c );
-			float focusWidth = isCellEditor ? 0 : getFocusWidth( c );
-			float borderWidth = getBorderWidth( c );
-			float arc = isCellEditor ? 0 : getArc( c );
+			float focusWidth = scale( (float) getFocusWidth( c ) );
+			float borderWidth = scale( (float) getBorderWidth( c ) );
+			float arc = scale( (float) getArc( c ) );
+			Color outlineColor = getOutlineColor( c );
 
-			if( isFocused( c ) ) {
-				float innerFocusWidth = !(c instanceof JScrollPane) ? this.innerFocusWidth : 0;
+			// paint outer border
+			if( outlineColor != null || isFocused( c ) ) {
+				float innerWidth = !isCellEditor( c ) && !(c instanceof JScrollPane)
+					? (outlineColor != null ? innerOutlineWidth : innerFocusWidth)
+					: 0;
 
-				g2.setColor( getFocusColor( c ) );
-				FlatUIUtils.paintComponentOuterBorder( g2, x, y, width, height, focusWidth,
-					getLineWidth( c ) + scale( innerFocusWidth ), arc );
+				g2.setColor( (outlineColor != null) ? outlineColor : getFocusColor( c ) );
+				FlatUIUtils.paintComponentOuterBorder( g2, x, y, width, height,
+					focusWidth, borderWidth + scale( innerWidth ), arc );
 			}
 
-			g2.setPaint( getBorderColor( c ) );
+			// paint border
+			g2.setPaint( (outlineColor != null) ? outlineColor : getBorderColor( c ) );
 			FlatUIUtils.paintComponentBorder( g2, x, y, width, height, focusWidth, borderWidth, arc );
 		} finally {
 			g2.dispose();
 		}
 	}
 
+	/**
+	 * Returns the outline color of the component border specified in client property
+	 * {@link FlatClientProperties#OUTLINE}.
+	 */
+	protected Color getOutlineColor( Component c ) {
+		if( !(c instanceof JComponent) )
+			return null;
+
+		Object outline = ((JComponent)c).getClientProperty( FlatClientProperties.OUTLINE );
+		if( outline instanceof String ) {
+			switch( (String) outline ) {
+				case FlatClientProperties.OUTLINE_ERROR:
+					return isFocused( c ) ? errorFocusedBorderColor : errorBorderColor;
+
+				case FlatClientProperties.OUTLINE_WARNING:
+					return isFocused( c ) ? warningFocusedBorderColor : warningBorderColor;
+			}
+		} else if( outline instanceof Color ) {
+			Color color = (Color) outline;
+			// use color functions to compute color for unfocused state
+			if( !isFocused( c ) && customBorderColor instanceof DerivedColor )
+				color = ((DerivedColor)customBorderColor).derive( color );
+			return color;
+		} else if( outline instanceof Color[] && ((Color[])outline).length >= 2 )
+			return ((Color[])outline)[isFocused( c ) ? 0 : 1];
+
+		return null;
+	}
+
 	protected Color getFocusColor( Component c ) {
 		return focusColor;
 	}
@@ -119,7 +167,7 @@ public class FlatBorder
 			JViewport viewport = ((JScrollPane)c).getViewport();
 			Component view = (viewport != null) ? viewport.getView() : null;
 			if( view != null ) {
-				if( view.hasFocus() )
+				if( FlatUIUtils.isPermanentFocusOwner( view ) )
 					return true;
 
 				if( (view instanceof JTable && ((JTable)view).isEditing()) ||
@@ -133,49 +181,81 @@ public class FlatBorder
 			return false;
 		} else if( c instanceof JComboBox && ((JComboBox<?>)c).isEditable() ) {
 			Component editorComponent = ((JComboBox<?>)c).getEditor().getEditorComponent();
-			return (editorComponent != null) ? editorComponent.hasFocus() : false;
+			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 textField.hasFocus();
+					return FlatUIUtils.isPermanentFocusOwner( textField );
 			}
 			return false;
 		} else
-			return c.hasFocus();
+			return FlatUIUtils.isPermanentFocusOwner( c );
 	}
 
-	protected boolean isTableCellEditor( Component c ) {
-		return FlatUIUtils.isTableCellEditor( c );
+	protected boolean isCellEditor( Component c ) {
+		return FlatUIUtils.isCellEditor( c );
 	}
 
 	@Override
 	public Insets getBorderInsets( Component c, Insets insets ) {
-		boolean isCellEditor = isTableCellEditor( c );
-		float ow = (isCellEditor ? 0 : getFocusWidth( c )) + getLineWidth( c );
+		float focusWidth = scale( (float) getFocusWidth( c ) );
+		float ow = 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 );
+
+		if( isCellEditor( c ) ) {
+			// remove top and bottom insets if used as cell editor
+			insets.top = insets.bottom = 0;
+
+			// remove right/left insets to avoid that text is truncated (e.g. in file chooser)
+			if( c.getComponentOrientation().isLeftToRight() )
+				insets.right = 0;
+			else
+				insets.left = 0;
+		}
+
 		return insets;
 	}
 
-	protected float getFocusWidth( Component c ) {
-		return scale( (float) focusWidth );
+	/**
+	 * Returns the (unscaled) thickness of the outer focus border.
+	 */
+	protected int getFocusWidth( Component c ) {
+		if( isCellEditor( c ) )
+			return 0;
+
+		return focusWidth;
 	}
 
-	protected float getLineWidth( Component c ) {
-		return scale( 1f );
+	/**
+	 * Returns the (unscaled) line thickness used to compute the border insets.
+	 * This may be different to {@link #getBorderWidth}.
+	 */
+	protected int getLineWidth( Component c ) {
+		return 1;
 	}
 
-	protected float getBorderWidth( Component c ) {
+	/**
+	 * 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 getArc( Component c ) {
+	/**
+	 * Returns the (unscaled) arc diameter of the border.
+	 */
+	protected int getArc( Component c ) {
 		return 0;
 	}
 }

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

@@ -16,7 +16,6 @@
 
 package com.formdev.flatlaf.ui;
 
-import static com.formdev.flatlaf.util.UIScale.scale;
 import java.awt.Color;
 import java.awt.Component;
 import java.awt.GradientPaint;
@@ -43,6 +42,7 @@ import com.formdev.flatlaf.util.UIScale;
  * @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.toolbar.margin				Insets
  * @uiDefault Button.toolbar.spacingInsets		Insets
@@ -63,6 +63,7 @@ public class FlatButtonBorder
 	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 Insets toolbarMargin = UIManager.getInsets( "Button.toolbar.margin" );
 	protected final Insets toolbarSpacingInsets = UIManager.getInsets( "Button.toolbar.spacingInsets" );
@@ -82,6 +83,11 @@ public class FlatButtonBorder
 		return FlatButtonUI.isDefaultButton( c ) ? defaultFocusColor : super.getFocusColor( c );
 	}
 
+	@Override
+	protected boolean isFocused( Component c ) {
+		return FlatButtonUI.isFocusPainted( c ) && super.isFocused( c );
+	}
+
 	@Override
 	protected Paint getBorderColor( Component c ) {
 		boolean def = FlatButtonUI.isDefaultButton( c );
@@ -115,8 +121,8 @@ public class FlatButtonBorder
 		} else {
 			insets = super.getBorderInsets( c, insets );
 
-			// use smaller left and right insets for icon-only buttons (so that they are square)
-			if( FlatButtonUI.isIconOnlyButton( c ) && ((AbstractButton)c).getMargin() instanceof UIResource )
+			// use smaller left and right insets for icon-only or single-character buttons (so that they are square)
+			if( FlatButtonUI.isIconOnlyOrSingleCharacterButton( c ) && ((AbstractButton)c).getMargin() instanceof UIResource )
 				insets.left = insets.right = Math.min( insets.top, insets.bottom );
 		}
 
@@ -124,17 +130,24 @@ public class FlatButtonBorder
 	}
 
 	@Override
-	protected float getFocusWidth( Component c ) {
-		return FlatToggleButtonUI.isTabButton( c ) ? 0 : super.getFocusWidth(c );
+	protected int getFocusWidth( Component c ) {
+		return FlatToggleButtonUI.isTabButton( c ) ? 0 : super.getFocusWidth( c );
 	}
 
 	@Override
-	protected float getBorderWidth( Component c ) {
-		return FlatButtonUI.isDefaultButton( c ) ? scale( (float) defaultBorderWidth ) : super.getBorderWidth( c );
+	protected int getBorderWidth( Component c ) {
+		return FlatButtonUI.isDefaultButton( c ) ? defaultBorderWidth : borderWidth;
 	}
 
 	@Override
-	protected float getArc( Component c ) {
-		return FlatButtonUI.isSquareButton( c ) ? 0 : scale( (float) arc );
+	protected int getArc( Component c ) {
+		if( isCellEditor( c ) )
+			return 0;
+
+		switch( FlatButtonUI.getButtonType( c ) ) {
+			case FlatButtonUI.TYPE_SQUARE: return 0;
+			case FlatButtonUI.TYPE_ROUND_RECT: return Short.MAX_VALUE;
+			default: return arc;
+		}
 	}
 }

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

@@ -39,7 +39,6 @@ import javax.swing.JToggleButton;
 import javax.swing.JToolBar;
 import javax.swing.LookAndFeel;
 import javax.swing.UIManager;
-import javax.swing.border.Border;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicButtonListener;
@@ -61,8 +60,6 @@ import com.formdev.flatlaf.util.UIScale;
  *
  * <!-- FlatButtonUI -->
  *
- * @uiDefault Component.focusWidth				int
- * @uiDefault Button.arc						int
  * @uiDefault Button.minimumWidth				int
  * @uiDefault Button.iconTextGap				int
  * @uiDefault Button.startBackground			Color	optional; if set, a gradient paint is used and Button.background is ignored
@@ -70,7 +67,11 @@ import com.formdev.flatlaf.util.UIScale;
  * @uiDefault Button.focusedBackground			Color	optional
  * @uiDefault Button.hoverBackground			Color	optional
  * @uiDefault Button.pressedBackground			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.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
@@ -86,23 +87,29 @@ import com.formdev.flatlaf.util.UIScale;
  * @uiDefault Button.toolbar.spacingInsets		Insets
  * @uiDefault Button.toolbar.hoverBackground	Color
  * @uiDefault Button.toolbar.pressedBackground	Color
+ * @uiDefault Button.toolbar.selectedBackground	Color
  *
  * @author Karl Tauber
  */
 public class FlatButtonUI
 	extends BasicButtonUI
 {
-	protected int focusWidth;
-	protected int arc;
 	protected int minimumWidth;
 	protected int iconTextGap;
 
+	protected Color background;
+	protected Color foreground;
+
 	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;
 
 	protected Color defaultBackground;
 	protected Color defaultEndBackground;
@@ -119,17 +126,14 @@ public class FlatButtonUI
 	protected Insets toolbarSpacingInsets;
 	protected Color toolbarHoverBackground;
 	protected Color toolbarPressedBackground;
+	protected Color toolbarSelectedBackground;
 
 	private Icon helpButtonIcon;
 
 	private boolean defaults_initialized = false;
 
-	private static ComponentUI instance;
-
 	public static ComponentUI createUI( JComponent c ) {
-		if( instance == null )
-			instance = new FlatButtonUI();
-		return instance;
+		return FlatUIUtils.createSharedUI( FlatButtonUI.class, FlatButtonUI::new );
 	}
 
 	@Override
@@ -139,17 +143,22 @@ public class FlatButtonUI
 		if( !defaults_initialized ) {
 			String prefix = getPropertyPrefix();
 
-			focusWidth = UIManager.getInt( "Component.focusWidth" );
-			arc = UIManager.getInt( "Button.arc" );
 			minimumWidth = UIManager.getInt( prefix + "minimumWidth" );
 			iconTextGap = FlatUIUtils.getUIInt( prefix + "iconTextGap", 4 );
 
+			background = UIManager.getColor( prefix + "background" );
+			foreground = UIManager.getColor( prefix + "foreground" );
+
 			startBackground = UIManager.getColor( prefix + "startBackground" );
 			endBackground = UIManager.getColor( prefix + "endBackground" );
 			focusedBackground = UIManager.getColor( prefix + "focusedBackground" );
 			hoverBackground = UIManager.getColor( prefix + "hoverBackground" );
 			pressedBackground = UIManager.getColor( prefix + "pressedBackground" );
+			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 );
@@ -172,6 +181,7 @@ public class FlatButtonUI
 			toolbarSpacingInsets = UIManager.getInsets( "Button.toolbar.spacingInsets" );
 			toolbarHoverBackground = UIManager.getColor( prefix + "toolbar.hoverBackground" );
 			toolbarPressedBackground = UIManager.getColor( prefix + "toolbar.pressedBackground" );
+			toolbarSelectedBackground = UIManager.getColor( prefix + "toolbar.selectedBackground" );
 
 			helpButtonIcon = UIManager.getIcon( "HelpButton.icon" );
 
@@ -187,7 +197,7 @@ public class FlatButtonUI
 		LookAndFeel.installProperty( b, "opaque", false );
 		LookAndFeel.installProperty( b, "iconTextGap", scale( iconTextGap ) );
 
-		MigLayoutVisualPadding.install( b, getFocusWidth( b ) );
+		MigLayoutVisualPadding.install( b );
 	}
 
 	@Override
@@ -200,21 +210,21 @@ public class FlatButtonUI
 
 	@Override
 	protected BasicButtonListener createButtonListener( AbstractButton b ) {
-		return new BasicButtonListener( b ) {
-			@Override
-			public void propertyChange( PropertyChangeEvent e ) {
-				super.propertyChange( e );
-				FlatButtonUI.this.propertyChange( b, e );
-			}
-		};
+		return new FlatButtonListener( b );
 	}
 
 	protected void propertyChange( AbstractButton b, PropertyChangeEvent e ) {
 		switch( e.getPropertyName() ) {
+			case SQUARE_SIZE:
 			case MINIMUM_WIDTH:
 			case MINIMUM_HEIGHT:
 				b.revalidate();
 				break;
+
+			case BUTTON_TYPE:
+				b.revalidate();
+				b.repaint();
+				break;
 		}
 	}
 
@@ -222,11 +232,19 @@ public class FlatButtonUI
 		return !(c instanceof AbstractButton) || ((AbstractButton)c).isContentAreaFilled();
 	}
 
+	public static boolean isFocusPainted( Component c ) {
+		return !(c instanceof AbstractButton) || ((AbstractButton)c).isFocusPainted();
+	}
+
 	static boolean isDefaultButton( Component c ) {
 		return c instanceof JButton && ((JButton)c).isDefaultButton();
 	}
 
-	static boolean isIconOnlyButton( Component c ) {
+	/**
+	 * 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.
+	 */
+	static boolean isIconOnlyOrSingleCharacterButton( Component c ) {
 		if( !(c instanceof JButton) && !(c instanceof JToggleButton) )
 			return false;
 
@@ -236,8 +254,23 @@ public class FlatButtonUI
 			(icon == null && text != null && ("...".equals( text ) || text.length() == 1));
 	}
 
-	static boolean isSquareButton( Component c ) {
-		return c instanceof AbstractButton && clientPropertyEquals( (AbstractButton) c, BUTTON_TYPE, BUTTON_TYPE_SQUARE );
+	static final int TYPE_OTHER = -1;
+	static final int TYPE_SQUARE = 0;
+	static final int TYPE_ROUND_RECT = 1;
+
+	static int getButtonType( Component c ) {
+		if( !(c instanceof AbstractButton) )
+			return TYPE_OTHER;
+
+		Object value = ((AbstractButton)c).getClientProperty( BUTTON_TYPE );
+		if( !(value instanceof String) )
+			return TYPE_OTHER;
+
+		switch( (String) value ) {
+			case BUTTON_TYPE_SQUARE:		return TYPE_SQUARE;
+			case BUTTON_TYPE_ROUND_RECT:	return TYPE_ROUND_RECT;
+			default:						return TYPE_OTHER;
+		}
 	}
 
 	static boolean isHelpButton( Component c ) {
@@ -245,7 +278,8 @@ public class FlatButtonUI
 	}
 
 	static boolean isToolBarButton( Component c ) {
-		return c.getParent() instanceof JToolBar;
+		return c.getParent() instanceof JToolBar ||
+			(c instanceof AbstractButton && clientPropertyEquals( (AbstractButton) c, BUTTON_TYPE, BUTTON_TYPE_TOOLBAR_BUTTON ));
 	}
 
 	@Override
@@ -267,54 +301,61 @@ public class FlatButtonUI
 
 	protected void paintBackground( Graphics g, JComponent c ) {
 		Color background = getBackground( c );
-		if( background != null ) {
-			Graphics2D g2 = (Graphics2D) g.create();
-			try {
-				FlatUIUtils.setRenderingHints( g2 );
+		if( background == null )
+			return;
 
-				Border border = c.getBorder();
-				boolean isToolBarButton = isToolBarButton( c );
-				float focusWidth = (border instanceof FlatBorder && !isToolBarButton) ? scale( (float) getFocusWidth( c ) ) : 0;
-				float arc = ((border instanceof FlatButtonBorder && !isSquareButton( c )) || isToolBarButton)
-					? scale( (float) this.arc ) : 0;
-				boolean def = isDefaultButton( c );
+		Graphics2D g2 = (Graphics2D) g.create();
+		try {
+			FlatUIUtils.setRenderingHints( g2 );
 
-				int x = 0;
-				int y = 0;
-				int width = c.getWidth();
-				int height = c.getHeight();
+			boolean isToolBarButton = isToolBarButton( c );
+			float focusWidth = isToolBarButton ? 0 : FlatUIUtils.getBorderFocusWidth( c );
+			float arc = FlatUIUtils.getBorderArc( c );
 
-				if( isToolBarButton ) {
-					Insets spacing = UIScale.scale( toolbarSpacingInsets );
-					x += spacing.left;
-					y += spacing.top;
-					width -= spacing.left + spacing.right;
-					height -= spacing.top + spacing.bottom;
-				}
+			boolean def = isDefaultButton( c );
 
-				// paint shadow
-				Color shadowColor = def ? defaultShadowColor : this.shadowColor;
-				if( !isToolBarButton && shadowColor != null && shadowWidth > 0 && focusWidth > 0 && !c.hasFocus() && c.isEnabled() ) {
-					g2.setColor( shadowColor );
-					g2.fill( new RoundRectangle2D.Float( focusWidth, focusWidth + UIScale.scale( (float) shadowWidth ),
-						width - focusWidth * 2, height - focusWidth * 2, arc, arc ) );
-				}
+			int x = 0;
+			int y = 0;
+			int width = c.getWidth();
+			int height = c.getHeight();
 
-				// paint background
-				Color startBg = def ? defaultBackground : startBackground;
-				Color endBg = def ? defaultEndBackground : endBackground;
-				if( background == startBg && endBg != null && !startBg.equals( endBg ) )
-					g2.setPaint( new GradientPaint( 0, 0, startBg, 0, height, endBg ) );
-				else
-					FlatUIUtils.setColor( g2, background, def ? defaultBackground : c.getBackground() );
-
-				FlatUIUtils.paintComponentBackground( g2, x, y, width, height, focusWidth, arc );
-			} finally {
-				g2.dispose();
+			if( isToolBarButton ) {
+				Insets spacing = UIScale.scale( toolbarSpacingInsets );
+				x += spacing.left;
+				y += spacing.top;
+				width -= spacing.left + spacing.right;
+				height -= spacing.top + spacing.bottom;
 			}
+
+			// paint shadow
+			Color shadowColor = def ? defaultShadowColor : this.shadowColor;
+			if( !isToolBarButton && shadowColor != null && shadowWidth > 0 && focusWidth > 0 &&
+				!(isFocusPainted( c ) && FlatUIUtils.isPermanentFocusOwner( c )) && c.isEnabled() )
+			{
+				g2.setColor( shadowColor );
+				g2.fill( new RoundRectangle2D.Float( focusWidth, focusWidth + UIScale.scale( (float) shadowWidth ),
+					width - focusWidth * 2, height - focusWidth * 2, arc, arc ) );
+			}
+
+			// paint background
+			Color startBg = def ? defaultBackground : startBackground;
+			Color endBg = def ? defaultEndBackground : endBackground;
+			if( background == startBg && endBg != null && !startBg.equals( endBg ) )
+				g2.setPaint( new GradientPaint( 0, 0, startBg, 0, height, endBg ) );
+			else
+				g2.setColor( FlatUIUtils.deriveColor( background, getBackgroundBase( c, def ) ) );
+
+			FlatUIUtils.paintComponentBackground( g2, x, y, width, height, focusWidth, arc );
+		} finally {
+			g2.dispose();
 		}
 	}
 
+	@Override
+	public void paint( Graphics g, JComponent c ) {
+		super.paint( FlatLabelUI.createGraphicsHTMLTextYCorrection( g, c ), c );
+	}
+
 	@Override
 	protected void paintText( Graphics g, AbstractButton b, Rectangle textRect, String text ) {
 		if( isHelpButton( b ) )
@@ -331,7 +372,7 @@ public class FlatButtonUI
 			}
 		}
 
-		paintText( g, b, textRect, text, b.isEnabled() ? getForeground( b ) : disabledText );
+		paintText( g, b, textRect, text, getForeground( b ) );
 	}
 
 	public static void paintText( Graphics g, AbstractButton b, Rectangle textRect, String text, Color foreground ) {
@@ -344,8 +385,19 @@ public class FlatButtonUI
 	}
 
 	protected Color getBackground( JComponent c ) {
+		if( ((AbstractButton)c).isSelected() ) {
+			// in toolbar use same 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 ? toolbarPressedBackground : pressedBackground );
+		}
+
 		if( !c.isEnabled() )
-			return null;
+			return disabledBackground;
 
 		// toolbar button
 		if( isToolBarButton( c ) ) {
@@ -361,13 +413,26 @@ public class FlatButtonUI
 
 		boolean def = isDefaultButton( c );
 		return buttonStateColor( c,
-			def ? defaultBackground : c.getBackground(),
+			getBackgroundBase( c, def ),
 			null,
-			def ? defaultFocusedBackground : focusedBackground,
+			isCustomBackground( c.getBackground() ) ? null : (def ? defaultFocusedBackground : focusedBackground),
 			def ? defaultHoverBackground : hoverBackground,
 			def ? defaultPressedBackground : pressedBackground );
 	}
 
+	protected Color getBackgroundBase( JComponent c, boolean def ) {
+		// use component background if explicitly set
+		Color bg = c.getBackground();
+		if( isCustomBackground( bg ) )
+			return bg;
+
+		return def ? defaultBackground : bg;
+	}
+
+	protected boolean isCustomBackground( Color bg ) {
+		return bg != background && (startBackground == null || bg != startBackground);
+	}
+
 	public static Color buttonStateColor( Component c, Color enabledColor, Color disabledColor,
 		Color focusedColor, Color hoverColor, Color pressedColor )
 	{
@@ -382,15 +447,30 @@ public class FlatButtonUI
 		if( hoverColor != null && b != null && b.getModel().isRollover() )
 			return hoverColor;
 
-		if( focusedColor != null && c.hasFocus() )
+		if( focusedColor != null && isFocusPainted( c ) && FlatUIUtils.isPermanentFocusOwner( c ) )
 			return focusedColor;
 
 		return enabledColor;
 	}
 
 	protected Color getForeground( JComponent c ) {
+		if( !c.isEnabled() )
+			return disabledText;
+
+		if( ((AbstractButton)c).isSelected() && !isToolBarButton( c ) )
+			return selectedForeground;
+
+		// use component foreground if explicitly set
+		Color fg = c.getForeground();
+		if( isCustomForeground( fg ) )
+			return fg;
+
 		boolean def = isDefaultButton( c );
-		return def ? defaultForeground : c.getForeground();
+		return def ? defaultForeground : fg;
+	}
+
+	protected boolean isCustomForeground( Color fg ) {
+		return fg != foreground;
 	}
 
 	@Override
@@ -399,23 +479,43 @@ public class FlatButtonUI
 			return new Dimension( helpButtonIcon.getIconWidth(), helpButtonIcon.getIconHeight() );
 
 		Dimension prefSize = super.getPreferredSize( c );
-		if ( prefSize == null )
+		if( prefSize == null )
 			return null;
 
-		// make button square if it is a icon-only button
-		// or apply minimum width, if not in toolbar and not a icon-only button
-		if( isIconOnlyButton( c ) )
+		// make square or apply minimum width/height
+		boolean isIconOnlyOrSingleCharacter = isIconOnlyOrSingleCharacterButton( c );
+		if( clientPropertyBoolean( c, SQUARE_SIZE, false ) ) {
+			// 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( !isToolBarButton( c ) && c.getBorder() instanceof FlatButtonBorder ) {
-			int focusWidth = getFocusWidth( c );
-			prefSize.width = Math.max( prefSize.width, scale( FlatUIUtils.minimumWidth( c, minimumWidth ) + (focusWidth * 2) ) );
-			prefSize.height = Math.max( prefSize.height, scale( FlatUIUtils.minimumHeight( c, 0 ) + (focusWidth * 2) ) );
+		} else if( !isIconOnlyOrSingleCharacter && !isToolBarButton( c ) && c.getBorder() instanceof FlatButtonBorder ) {
+			// 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 ) );
 		}
 
 		return prefSize;
 	}
 
-	protected int getFocusWidth( JComponent c ) {
-		return focusWidth;
+	//---- class FlatButtonListener -------------------------------------------
+
+	protected class FlatButtonListener
+		extends BasicButtonListener
+	{
+		private final AbstractButton b;
+
+		protected FlatButtonListener( AbstractButton b ) {
+			super( b );
+			this.b = b;
+		}
+
+		@Override
+		public void propertyChange( PropertyChangeEvent e ) {
+			super.propertyChange( e );
+			FlatButtonUI.this.propertyChange( b, e );
+		}
 	}
 }

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

@@ -31,18 +31,20 @@ import javax.swing.text.JTextComponent;
  *
  * @author Karl Tauber
  */
-class FlatCaret
+public class FlatCaret
 	extends DefaultCaret
 	implements UIResource
 {
 	private final String selectAllOnFocusPolicy;
+	private final boolean selectAllOnMouseClick;
 
 	private boolean wasFocused;
 	private boolean wasTemporaryLost;
 	private boolean isMousePressed;
 
-	FlatCaret( String selectAllOnFocusPolicy ) {
+	public FlatCaret( String selectAllOnFocusPolicy, boolean selectAllOnMouseClick ) {
 		this.selectAllOnFocusPolicy = selectAllOnFocusPolicy;
+		this.selectAllOnMouseClick = selectAllOnMouseClick;
 	}
 
 	@Override
@@ -61,7 +63,7 @@ class FlatCaret
 
 	@Override
 	public void focusGained( FocusEvent e ) {
-		if( !wasTemporaryLost && !isMousePressed )
+		if( !wasTemporaryLost && (!isMousePressed || selectAllOnMouseClick) )
 			selectAllOnFocusGained();
 		wasTemporaryLost = false;
 		wasFocused = true;
@@ -87,7 +89,7 @@ class FlatCaret
 		super.mouseReleased( e );
 	}
 
-	private void selectAllOnFocusGained() {
+	protected void selectAllOnFocusGained() {
 		JTextComponent c = getComponent();
 		Document doc = c.getDocument();
 		if( doc == null || !c.isEnabled() || !c.isEditable() )

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

@@ -16,12 +16,11 @@
 
 package com.formdev.flatlaf.ui;
 
-import static com.formdev.flatlaf.util.UIScale.scale;
+import java.awt.Dimension;
 import java.awt.Graphics;
-import java.awt.Rectangle;
-import java.beans.PropertyChangeListener;
+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.BasicCheckBoxMenuItemUI;
 
@@ -30,29 +29,34 @@ import javax.swing.plaf.basic.BasicCheckBoxMenuItemUI;
  *
  * <!-- BasicCheckBoxMenuItemUI -->
  *
- * @uiDefault CheckBoxMenuItem.font								Font
- * @uiDefault CheckBoxMenuItem.background						Color
- * @uiDefault CheckBoxMenuItem.foreground						Color
- * @uiDefault CheckBoxMenuItem.disabledForeground				Color
- * @uiDefault CheckBoxMenuItem.selectionBackground				Color
- * @uiDefault CheckBoxMenuItem.selectionForeground				Color
- * @uiDefault CheckBoxMenuItem.acceleratorForeground			Color
- * @uiDefault CheckBoxMenuItem.acceleratorSelectionForeground	Color
- * @uiDefault MenuItem.acceleratorFont							Font		defaults to MenuItem.font
- * @uiDefault MenuItem.acceleratorDelimiter						String
- * @uiDefault CheckBoxMenuItem.border							Border
- * @uiDefault CheckBoxMenuItem.borderPainted					boolean
- * @uiDefault CheckBoxMenuItem.margin							Insets
- * @uiDefault CheckBoxMenuItem.arrowIcon						Icon
- * @uiDefault CheckBoxMenuItem.checkIcon						Icon
- * @uiDefault CheckBoxMenuItem.opaque							boolean
- * @uiDefault CheckBoxMenuItem.evenHeight						boolean
+ * @uiDefault CheckBoxMenuItem.font									Font
+ * @uiDefault CheckBoxMenuItem.background							Color
+ * @uiDefault CheckBoxMenuItem.foreground							Color
+ * @uiDefault CheckBoxMenuItem.disabledForeground					Color
+ * @uiDefault CheckBoxMenuItem.selectionBackground					Color
+ * @uiDefault CheckBoxMenuItem.selectionForeground					Color
+ * @uiDefault CheckBoxMenuItem.acceleratorForeground				Color
+ * @uiDefault CheckBoxMenuItem.acceleratorSelectionForeground		Color
+ * @uiDefault MenuItem.acceleratorFont								Font		defaults to MenuItem.font
+ * @uiDefault MenuItem.acceleratorDelimiter							String
+ * @uiDefault CheckBoxMenuItem.border								Border
+ * @uiDefault CheckBoxMenuItem.borderPainted						boolean
+ * @uiDefault CheckBoxMenuItem.margin								Insets
+ * @uiDefault CheckBoxMenuItem.arrowIcon							Icon
+ * @uiDefault CheckBoxMenuItem.checkIcon							Icon
+ * @uiDefault CheckBoxMenuItem.opaque								boolean
+ *
+ * <!-- FlatCheckBoxMenuItemUI -->
+ *
+ * @uiDefault MenuItem.iconTextGap									int
  *
  * @author Karl Tauber
  */
 public class FlatCheckBoxMenuItemUI
 	extends BasicCheckBoxMenuItemUI
 {
+	private FlatMenuItemRenderer renderer;
+
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatCheckBoxMenuItemUI();
 	}
@@ -61,25 +65,30 @@ public class FlatCheckBoxMenuItemUI
 	protected void installDefaults() {
 		super.installDefaults();
 
-		// scale
-		defaultTextIconGap = scale( defaultTextIconGap );
-	}
+		LookAndFeel.installProperty( menuItem, "iconTextGap", FlatUIUtils.getUIInt( "MenuItem.iconTextGap", 4 ) );
 
-	/**
-	 * Scale defaultTextIconGap again if iconTextGap property has changed.
-	 */
-	@Override
-	protected PropertyChangeListener createPropertyChangeListener( JComponent c ) {
-		PropertyChangeListener superListener = super.createPropertyChangeListener( c );
-		return e -> {
-			superListener.propertyChange( e );
-			if( e.getPropertyName() == "iconTextGap" )
-				defaultTextIconGap = scale( defaultTextIconGap );
-		};
+		renderer = createRenderer();
 	}
 
 	@Override
-	protected void paintText( Graphics g, JMenuItem menuItem, Rectangle textRect, String text ) {
-		FlatMenuItemUI.paintText( g, menuItem, textRect, text, disabledForeground, selectionForeground );
+	protected void uninstallDefaults() {
+		super.uninstallDefaults();
+
+		renderer = null;
+	}
+
+	protected FlatMenuItemRenderer createRenderer() {
+		return new FlatMenuItemRenderer( menuItem, checkIcon, arrowIcon, acceleratorFont, acceleratorDelimiter );
+	}
+
+	@Override
+	protected Dimension getPreferredMenuItemSize( JComponent c, Icon checkIcon, Icon arrowIcon, int defaultTextIconGap ) {
+		return renderer.getPreferredMenuItemSize();
+	}
+
+	@Override
+	public void paint( Graphics g, JComponent c ) {
+		renderer.paintMenuItem( g, selectionBackground, selectionForeground, disabledForeground,
+			acceleratorForeground, acceleratorSelectionForeground );
 	}
 }

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

@@ -42,12 +42,8 @@ import javax.swing.plaf.ComponentUI;
 public class FlatCheckBoxUI
 	extends FlatRadioButtonUI
 {
-	private static ComponentUI instance;
-
 	public static ComponentUI createUI( JComponent c ) {
-		if( instance == null )
-			instance = new FlatCheckBoxUI();
-		return instance;
+		return FlatUIUtils.createSharedUI( FlatCheckBoxUI.class, FlatCheckBoxUI::new );
 	}
 
 	@Override

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

@@ -24,10 +24,12 @@ import java.awt.Container;
 import java.awt.Dimension;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
+import java.awt.GraphicsConfiguration;
 import java.awt.Insets;
 import java.awt.LayoutManager;
 import java.awt.Rectangle;
 import java.awt.Shape;
+import java.awt.Toolkit;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 import java.awt.event.FocusEvent;
@@ -39,6 +41,7 @@ import java.beans.PropertyChangeListener;
 import java.lang.ref.WeakReference;
 import javax.swing.AbstractAction;
 import javax.swing.BorderFactory;
+import javax.swing.ComboBoxEditor;
 import javax.swing.DefaultListCellRenderer;
 import javax.swing.InputMap;
 import javax.swing.JButton;
@@ -46,6 +49,8 @@ import javax.swing.JComboBox;
 import javax.swing.JComponent;
 import javax.swing.JList;
 import javax.swing.JPanel;
+import javax.swing.JScrollBar;
+import javax.swing.JTextField;
 import javax.swing.KeyStroke;
 import javax.swing.ListCellRenderer;
 import javax.swing.LookAndFeel;
@@ -76,9 +81,11 @@ import com.formdev.flatlaf.util.UIScale;
  *
  * <!-- FlatComboBoxUI -->
  *
- * @uiDefault Component.focusWidth				int
- * @uiDefault Component.arc						int
- * @uiDefault Component.arrowType				String	triangle (default) or chevron
+ * @uiDefault ComboBox.minimumWidth				int
+ * @uiDefault ComboBox.editorColumns			int
+ * @uiDefault ComboBox.maximumRowCount			int
+ * @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
@@ -96,8 +103,9 @@ import com.formdev.flatlaf.util.UIScale;
 public class FlatComboBoxUI
 	extends BasicComboBoxUI
 {
-	protected int focusWidth;
-	protected int arc;
+	protected int minimumWidth;
+	protected int editorColumns;
+	protected String buttonStyle;
 	protected String arrowType;
 	protected boolean isIntelliJTheme;
 	protected Color borderColor;
@@ -114,7 +122,7 @@ public class FlatComboBoxUI
 	protected Color buttonHoverArrowColor;
 
 	private MouseListener hoverListener;
-	private boolean hover;
+	protected boolean hover;
 
 	private WeakReference<Component> lastRendererComponent;
 
@@ -150,8 +158,9 @@ public class FlatComboBoxUI
 
 		LookAndFeel.installProperty( comboBox, "opaque", false );
 
-		focusWidth = UIManager.getInt( "Component.focusWidth" );
-		arc = UIManager.getInt( "Component.arc" );
+		minimumWidth = UIManager.getInt( "ComboBox.minimumWidth" );
+		editorColumns = UIManager.getInt( "ComboBox.editorColumns" );
+		buttonStyle = UIManager.getString( "ComboBox.buttonStyle" );
 		arrowType = UIManager.getString( "Component.arrowType" );
 		isIntelliJTheme = UIManager.getBoolean( "Component.isIntelliJTheme" );
 		borderColor = UIManager.getColor( "Component.borderColor" );
@@ -167,10 +176,15 @@ public class FlatComboBoxUI
 		buttonDisabledArrowColor = UIManager.getColor( "ComboBox.buttonDisabledArrowColor" );
 		buttonHoverArrowColor = UIManager.getColor( "ComboBox.buttonHoverArrowColor" );
 
+		// set maximumRowCount
+		int maximumRowCount = UIManager.getInt( "ComboBox.maximumRowCount" );
+		if( maximumRowCount > 0 && maximumRowCount != 8 && comboBox.getMaximumRowCount() == 8 )
+			comboBox.setMaximumRowCount( maximumRowCount );
+
 		// scale
 		padding = UIScale.scale( padding );
 
-		MigLayoutVisualPadding.install( comboBox, focusWidth );
+		MigLayoutVisualPadding.install( comboBox );
 	}
 
 	@Override
@@ -249,6 +263,10 @@ public class FlatComboBoxUI
 					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();
 			}
 		};
 	}
@@ -258,17 +276,33 @@ public class FlatComboBoxUI
 		return new FlatComboPopup( comboBox );
 	}
 
+	@Override
+	protected ComboBoxEditor createEditor() {
+		ComboBoxEditor comboBoxEditor = super.createEditor();
+
+		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() );
+		}
+
+		return comboBoxEditor;
+	}
+
 	@Override
 	protected void configureEditor() {
 		super.configureEditor();
 
-		// assign a 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"
-		if( editor instanceof JTextComponent )
-			((JTextComponent)editor).setBorder( BorderFactory.createEmptyBorder() );
+		// 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 )
@@ -279,7 +313,7 @@ public class FlatComboBoxUI
 		updateEditorColors();
 
 		// macOS
-		if( SystemInfo.IS_MAC && editor instanceof JTextComponent ) {
+		if( SystemInfo.isMacOS && editor instanceof JTextComponent ) {
 			// delegate actions from editor text field to combobox, which is necessary
 			// because text field on macOS already handle those keys
 			InputMap inputMap = ((JTextComponent)editor).getInputMap();
@@ -296,53 +330,45 @@ public class FlatComboBoxUI
 		// use non-UIResource colors because when SwingUtilities.updateComponentTreeUI()
 		// is used, then the editor is updated after the combobox and the
 		// colors are again replaced with default colors
-		boolean enabled = editor.isEnabled();
-		editor.setForeground( FlatUIUtils.nonUIResource( (enabled || editor instanceof JTextComponent)
-			? comboBox.getForeground()
-			: disabledForeground ) );
-		if( editor instanceof JTextComponent )
-			((JTextComponent)editor).setDisabledTextColor( FlatUIUtils.nonUIResource( disabledForeground ) );
+		boolean isTextComponent = editor instanceof JTextComponent;
+		editor.setForeground( FlatUIUtils.nonUIResource( getForeground( isTextComponent || editor.isEnabled() ) ) );
+
+		if( isTextComponent )
+			((JTextComponent)editor).setDisabledTextColor( FlatUIUtils.nonUIResource( getForeground( false ) ) );
 	}
 
 	@Override
 	protected JButton createArrowButton() {
-		return new FlatArrowButton( SwingConstants.SOUTH, arrowType, buttonArrowColor,
-			buttonDisabledArrowColor, buttonHoverArrowColor, null )
-		{
-			@Override
-			protected boolean isHover() {
-				return super.isHover() || (!comboBox.isEditable() ? hover : false);
-			}
-		};
+		return new FlatComboBoxButton();
 	}
 
 	@Override
 	public void update( Graphics g, JComponent c ) {
+		float focusWidth = FlatUIUtils.getBorderFocusWidth( c );
+		float arc = FlatUIUtils.getBorderArc( c );
+
 		// fill background if opaque to avoid garbage if user sets opaque to true
-		if( c.isOpaque() && (focusWidth > 0 || arc != 0) )
+		if( c.isOpaque() && (focusWidth > 0 || arc > 0) )
 			FlatUIUtils.paintParentBackground( g, c );
 
 		Graphics2D g2 = (Graphics2D) g;
-		FlatUIUtils.setRenderingHints( g2 );
+		Object[] oldRenderingHints = FlatUIUtils.setRenderingHints( g2 );
 
 		int width = c.getWidth();
 		int height = c.getHeight();
-		float focusWidth = (c.getBorder() instanceof FlatBorder) ? scale( (float) this.focusWidth ) : 0;
-		float arc = (c.getBorder() instanceof FlatRoundBorder) ? scale( (float) this.arc ) : 0;
 		int arrowX = arrowButton.getX();
 		int arrowWidth = arrowButton.getWidth();
+		boolean paintButton = (comboBox.isEditable() || "button".equals( buttonStyle )) && !"none".equals( buttonStyle );
 		boolean enabled = comboBox.isEnabled();
 		boolean isLeftToRight = comboBox.getComponentOrientation().isLeftToRight();
 
 		// paint background
-		g2.setColor( enabled
-			? (editableBackground != null && comboBox.isEditable() ? editableBackground : c.getBackground())
-			: getDisabledBackground( comboBox ) );
+		g2.setColor( getBackground( enabled ) );
 		FlatUIUtils.paintComponentBackground( g2, 0, 0, width, height, focusWidth, arc );
 
 		// paint arrow button background
 		if( enabled ) {
-			g2.setColor( comboBox.isEditable() ? buttonEditableBackground : buttonBackground );
+			g2.setColor( paintButton ? buttonEditableBackground : buttonBackground );
 			Shape oldClip = g2.getClip();
 			if( isLeftToRight )
 				g2.clipRect( arrowX, 0, width - arrowX, height );
@@ -353,13 +379,16 @@ public class FlatComboBoxUI
 		}
 
 		// paint vertical line between value and arrow button
-		if( comboBox.isEditable() ) {
+		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)) );
 		}
 
+		// avoid that the "current value" renderer is invoked with enabled antialiasing
+		FlatUIUtils.resetRenderingHints( g2, oldRenderingHints );
+
 		paint( g, c );
 	}
 
@@ -376,8 +405,8 @@ public class FlatComboBoxUI
 		uninstallCellPaddingBorder( c );
 
 		boolean enabled = comboBox.isEnabled();
-		c.setForeground( enabled ? comboBox.getForeground() : disabledForeground );
-		c.setBackground( enabled ? comboBox.getBackground() : getDisabledBackground( comboBox ) );
+		c.setBackground( getBackground( enabled ) );
+		c.setForeground( getForeground( enabled ) );
 
 		boolean shouldValidate = (c instanceof JPanel);
 		if( padding != null )
@@ -394,12 +423,24 @@ public class FlatComboBoxUI
 
 	@Override
 	public void paintCurrentValueBackground( Graphics g, Rectangle bounds, boolean hasFocus ) {
-		g.setColor( comboBox.isEnabled() ? comboBox.getBackground() : getDisabledBackground( comboBox ) );
-		g.fillRect( bounds.x, bounds.y, bounds.width, bounds.height );
+		// not necessary because already painted in update()
 	}
 
-	private Color getDisabledBackground( JComponent c ) {
-		return isIntelliJTheme ? FlatUIUtils.getParentBackground( c ) : disabledBackground;
+	protected Color getBackground( boolean enabled ) {
+		return enabled
+			? (editableBackground != null && comboBox.isEditable() ? editableBackground : comboBox.getBackground())
+			: (isIntelliJTheme ? FlatUIUtils.getParentBackground( comboBox ) : disabledBackground);
+	}
+
+	protected Color getForeground( boolean enabled ) {
+		return enabled ? comboBox.getForeground() : disabledForeground;
+	}
+
+	@Override
+	public Dimension getMinimumSize( JComponent c ) {
+		Dimension minimumSize = super.getMinimumSize( c );
+		minimumSize.width = Math.max( minimumSize.width, scale( FlatUIUtils.minimumWidth( c, minimumWidth ) ) );
+		return minimumSize;
 	}
 
 	@Override
@@ -422,6 +463,18 @@ public class FlatComboBoxUI
 
 		Dimension displaySize = super.getDisplaySize();
 
+		// recalculate width without hardcoded 100 under special conditions
+		if( displaySize.width == 100 + padding.left + padding.right &&
+			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 );
+		}
+
 		uninstallCellPaddingBorder( renderer );
 		return displaySize;
 	}
@@ -457,15 +510,36 @@ public class FlatComboBoxUI
 		}
 	}
 
+	//---- class FlatComboBoxButton -------------------------------------------
+
+	protected class FlatComboBoxButton
+		extends FlatArrowButton
+	{
+		protected FlatComboBoxButton() {
+			this( SwingConstants.SOUTH, arrowType, buttonArrowColor, buttonDisabledArrowColor, buttonHoverArrowColor, null, null );
+		}
+
+		protected FlatComboBoxButton( int direction, String type, Color foreground, Color disabledForeground,
+			Color hoverForeground, Color hoverBackground, Color pressedBackground )
+		{
+			super( direction, type, foreground, disabledForeground, hoverForeground, hoverBackground, pressedBackground );
+		}
+
+		@Override
+		protected boolean isHover() {
+			return super.isHover() || (!comboBox.isEditable() ? hover : false);
+		}
+	}
+
 	//---- class FlatComboPopup -----------------------------------------------
 
 	@SuppressWarnings( { "rawtypes", "unchecked" } )
-	private class FlatComboPopup
+	protected class FlatComboPopup
 		extends BasicComboPopup
 	{
 		private CellPaddingBorder paddingBorder;
 
-		FlatComboPopup( JComboBox combo ) {
+		protected FlatComboPopup( JComboBox combo ) {
 			super( combo );
 
 			// BasicComboPopup listens to JComboBox.componentOrientation and updates
@@ -480,18 +554,37 @@ public class FlatComboBoxUI
 
 		@Override
 		protected Rectangle computePopupBounds( int px, int py, int pw, int ph ) {
-			// get maximum display size of all items, ignoring prototype value
-			Object prototype = comboBox.getPrototypeDisplayValue();
-			if( prototype != null )
-				comboBox.setPrototypeDisplayValue( null );
-			Dimension displaySize = getDisplaySize();
-			if( prototype != null )
-				comboBox.setPrototypeDisplayValue( prototype );
+			// get maximum display width of all items
+			int displayWidth = getDisplaySize().width;
+
+			// add border insets
+			for( Border border : new Border[] { scroller.getViewportBorder(), scroller.getBorder() } ) {
+				if( border != null ) {
+					Insets borderInsets = border.getBorderInsets( null );
+					displayWidth += borderInsets.left + borderInsets.right;
+				}
+			}
+
+			// add width of vertical scroll bar
+			JScrollBar verticalScrollBar = scroller.getVerticalScrollBar();
+			if( verticalScrollBar != null )
+				displayWidth += verticalScrollBar.getPreferredSize().width;
 
 			// make popup wider if necessary
-			if( displaySize.width > pw ) {
-				int diff = displaySize.width - pw;
-				pw = displaySize.width;
+			if( displayWidth > pw ) {
+				// limit popup width to screen width
+				GraphicsConfiguration gc = comboBox.getGraphicsConfiguration();
+				if( gc != null ) {
+					Rectangle screenBounds = gc.getBounds();
+					Insets screenInsets = Toolkit.getDefaultToolkit().getScreenInsets( gc );
+					displayWidth = Math.min( displayWidth, screenBounds.width - screenInsets.left - screenInsets.right );
+				} else {
+					Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
+					displayWidth = Math.min( displayWidth, screenSize.width );
+				}
+
+				int diff = displayWidth - pw;
+				pw = displayWidth;
 
 				if( !comboBox.getComponentOrientation().isLeftToRight() )
 					px -= diff;

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

@@ -0,0 +1,223 @@
+/*
+ * Copyright 2020 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.Color;
+import java.awt.Component;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.Image;
+import java.awt.Insets;
+import java.awt.RadialGradientPaint;
+import java.awt.image.BufferedImage;
+import com.formdev.flatlaf.util.HiDPIUtils;
+import com.formdev.flatlaf.util.UIScale;
+
+/**
+ * Paints a drop shadow border around the component.
+ * Supports 1-sided, 2-side, 3-sided or 4-sided drop shadows.
+ * <p>
+ * The shadow insets allow specifying drop shadow thickness for each side.
+ * A zero or negative value hides the drop shadow on that side.
+ * A negative value can be used to indent the drop shadow on corners.
+ * E.g. -4 on left indents drop shadow at top-left and bottom-left corners by 4 pixels.
+ *
+ * @author Karl Tauber
+ */
+public class FlatDropShadowBorder
+	extends FlatEmptyBorder
+{
+	private final Color shadowColor;
+	private final Insets shadowInsets;
+	private final float shadowOpacity;
+
+	private final int shadowSize;
+	private Image shadowImage;
+	private Color lastShadowColor;
+	private double lastSystemScaleFactor;
+	private float lastUserScaleFactor;
+
+	public FlatDropShadowBorder() {
+		this( null );
+	}
+
+	public FlatDropShadowBorder( Color shadowColor ) {
+		this( shadowColor, 4, 0.5f );
+	}
+
+	public FlatDropShadowBorder( Color shadowColor, int shadowSize, float shadowOpacity ) {
+		this( shadowColor, new Insets( -shadowSize, -shadowSize, shadowSize, shadowSize ), shadowOpacity );
+	}
+
+	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 ) );
+		this.shadowColor = shadowColor;
+		this.shadowInsets = shadowInsets;
+		this.shadowOpacity = shadowOpacity;
+
+		shadowSize = Math.max(
+			Math.max( shadowInsets.left, shadowInsets.right ),
+			Math.max( shadowInsets.top, shadowInsets.bottom ) );
+	}
+
+	@Override
+	public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
+		if( shadowSize <= 0 )
+			return;
+
+		HiDPIUtils.paintAtScale1x( (Graphics2D) g, x, y, width, height, this::paintImpl );
+	}
+
+	private void paintImpl( Graphics2D g, int x, int y, int width, int height, double scaleFactor ) {
+		Color shadowColor = (this.shadowColor != null) ? this.shadowColor : g.getColor();
+		int shadowSize = scale( this.shadowSize, scaleFactor );
+
+		// create and cache shadow image
+		float userScaleFactor = UIScale.getUserScaleFactor();
+		if( shadowImage == null ||
+			!shadowColor.equals( lastShadowColor ) ||
+			lastSystemScaleFactor != scaleFactor ||
+			lastUserScaleFactor != userScaleFactor )
+		{
+			shadowImage = createShadowImage( shadowColor, shadowSize, shadowOpacity,
+				(float) (scaleFactor * userScaleFactor) );
+			lastShadowColor = shadowColor;
+			lastSystemScaleFactor = scaleFactor;
+			lastUserScaleFactor = userScaleFactor;
+		}
+
+/*debug
+		int m = shadowImage.getWidth( null );
+		Color oldColor = g.getColor();
+		g.setColor( Color.lightGray );
+		g.drawRect( x - m - 1, y - m - 1, m + 1, m + 1 );
+		g.setColor( Color.white );
+		g.fillRect( x - m, y - m, m, m );
+		g.drawImage( shadowImage, x - m, y - m, null );
+		g.setColor( oldColor );
+debug*/
+
+		int left = scale( shadowInsets.left, scaleFactor );
+		int right = scale( shadowInsets.right, scaleFactor );
+		int top = scale( shadowInsets.top, scaleFactor );
+		int bottom = scale( shadowInsets.bottom, scaleFactor );
+
+		// shadow outer coordinates
+		int x1o = x - Math.min( left, 0 );
+		int y1o = y - Math.min( top, 0 );
+		int x2o = x + width + Math.min( right, 0 );
+		int y2o = y + height + Math.min( bottom, 0 );
+
+		// shadow inner coordinates
+		int x1i = x1o + shadowSize;
+		int y1i = y1o + shadowSize;
+		int x2i = x2o - shadowSize;
+		int y2i = y2o - shadowSize;
+
+		int wh = (shadowSize * 2) - 1;
+		int center = shadowSize - 1;
+
+		// left-top edge
+		if( left > 0 || top > 0 ) {
+			g.drawImage( shadowImage, x1o, y1o, x1i, y1i,
+				0, 0, center, center, null );
+		}
+
+		// top shadow
+		if( top > 0 ) {
+			g.drawImage( shadowImage, x1i, y1o, x2i, y1i,
+				center, 0, center + 1, center, null );
+		}
+
+		// right-top edge
+		if( right > 0 || top > 0 ) {
+			g.drawImage( shadowImage, x2i, y1o, x2o, y1i,
+				center, 0, wh, center, null );
+		}
+
+		// left shadow
+		if( left > 0 ) {
+			g.drawImage( shadowImage, x1o, y1i, x1i, y2i,
+				0, center, center, center + 1, null );
+		}
+
+		// right shadow
+		if( right > 0 ) {
+			g.drawImage( shadowImage, x2i, y1i, x2o, y2i,
+				center, center, wh, center + 1, null );
+		}
+
+		// left-bottom edge
+		if( left > 0 || bottom > 0 ) {
+			g.drawImage( shadowImage, x1o, y2i, x1i, y2o,
+				0, center, center, wh, null );
+		}
+
+		// bottom shadow
+		if( bottom > 0 ) {
+			g.drawImage( shadowImage, x1i, y2i, x2i, y2o,
+				center, center, center + 1, wh, null );
+		}
+
+		// right-bottom edge
+		if( right > 0 || bottom > 0 ) {
+			g.drawImage( shadowImage, x2i, y2i, x2o, y2o,
+				center, center, wh, wh, null );
+		}
+	}
+
+	private int scale( int value, double scaleFactor ) {
+		return (int) Math.ceil( UIScale.scale( value ) * scaleFactor );
+	}
+
+	private static BufferedImage createShadowImage( Color shadowColor, int shadowSize,
+		float shadowOpacity, float scaleFactor )
+	{
+		int shadowRGB = shadowColor.getRGB() & 0xffffff;
+		int shadowAlpha = (int) (255 * shadowOpacity);
+		Color startColor = new Color( shadowRGB | ((shadowAlpha & 0xff) << 24), true );
+		Color midColor = new Color( shadowRGB | (((shadowAlpha / 2) & 0xff) << 24), true );
+		Color endColor = new Color( shadowRGB, true );
+
+/*debug
+		startColor = Color.red;
+		midColor = Color.green;
+		endColor = Color.blue;
+debug*/
+
+		int wh = (shadowSize * 2) - 1;
+		int center = shadowSize - 1;
+
+		RadialGradientPaint p = new RadialGradientPaint( center, center,
+			shadowSize - (0.75f * scaleFactor),
+			new float[] { 0, 0.35f, 1 },
+			new Color[] { startColor, midColor, endColor } );
+
+		BufferedImage image = new BufferedImage( wh, wh, BufferedImage.TYPE_INT_ARGB );
+
+		Graphics2D g = image.createGraphics();
+		try {
+			g.setPaint( p );
+			g.fillRect( 0, 0, wh, wh );
+		} finally {
+			g.dispose();
+		}
+
+		return image;
+	}
+}

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

@@ -19,6 +19,8 @@ package com.formdev.flatlaf.ui;
 import static com.formdev.flatlaf.util.UIScale.scale;
 import java.awt.Dimension;
 import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.beans.PropertyChangeEvent;
 import javax.swing.JComponent;
 import javax.swing.JEditorPane;
 import javax.swing.UIManager;
@@ -26,6 +28,8 @@ import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicEditorPaneUI;
 import javax.swing.text.JTextComponent;
+import com.formdev.flatlaf.FlatClientProperties;
+import com.formdev.flatlaf.util.HiDPIUtils;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JEditorPane}.
@@ -83,26 +87,45 @@ public class FlatEditorPaneUI
 		getComponent().putClientProperty( JEditorPane.HONOR_DISPLAY_PROPERTIES, oldHonorDisplayProperties );
 	}
 
+	@Override
+	protected void propertyChange( PropertyChangeEvent e ) {
+		super.propertyChange( e );
+		propertyChange( getComponent(), e );
+	}
+
+	static void propertyChange( JTextComponent c, PropertyChangeEvent e ) {
+		switch( e.getPropertyName() ) {
+			case FlatClientProperties.MINIMUM_WIDTH:
+				c.revalidate();
+				break;
+		}
+	}
+
 	@Override
 	public Dimension getPreferredSize( JComponent c ) {
-		return applyMinimumWidth( super.getPreferredSize( c ) );
+		return applyMinimumWidth( c, super.getPreferredSize( c ), minimumWidth );
 	}
 
 	@Override
 	public Dimension getMinimumSize( JComponent c ) {
-		return applyMinimumWidth( super.getMinimumSize( c ) );
+		return applyMinimumWidth( c, super.getMinimumSize( c ), minimumWidth );
 	}
 
-	private Dimension applyMinimumWidth( Dimension size ) {
+	static Dimension applyMinimumWidth( JComponent c, Dimension size, int minimumWidth ) {
 		// 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
 		// issues. E.g. at scale factor 1.5 the first returns 4, but the second 3.
-		int minimumWidth = FlatUIUtils.minimumWidth( getComponent(), this.minimumWidth );
+		minimumWidth = FlatUIUtils.minimumWidth( c, minimumWidth );
 		size.width = Math.max( size.width, scale( minimumWidth ) - (scale( 1 ) * 2) );
 		return size;
 	}
 
+	@Override
+	protected void paintSafely( Graphics g ) {
+		super.paintSafely( HiDPIUtils.createGraphicsTextYCorrection( (Graphics2D) g ) );
+	}
+
 	@Override
 	protected void paintBackground( Graphics g ) {
 		JTextComponent c = getComponent();

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

@@ -57,4 +57,8 @@ public class FlatEmptyBorder
 		insets.bottom = scale( bottom );
 		return insets;
 	}
+
+	public Insets getUnscaledBorderInsets() {
+		return super.getBorderInsets();
+	}
 }

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

@@ -16,11 +16,28 @@
 
 package com.formdev.flatlaf.ui;
 
+import java.awt.BorderLayout;
+import java.awt.Component;
 import java.awt.Dimension;
+import java.awt.Insets;
+import java.io.File;
+import javax.swing.AbstractButton;
+import javax.swing.Box;
+import javax.swing.BoxLayout;
+import javax.swing.Icon;
+import javax.swing.ImageIcon;
+import javax.swing.JButton;
+import javax.swing.JComboBox;
 import javax.swing.JComponent;
 import javax.swing.JFileChooser;
+import javax.swing.JPanel;
+import javax.swing.JToggleButton;
+import javax.swing.UIManager;
+import javax.swing.filechooser.FileView;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.metal.MetalFileChooserUI;
+import com.formdev.flatlaf.FlatClientProperties;
+import com.formdev.flatlaf.util.ScaledImageIcon;
 import com.formdev.flatlaf.util.UIScale;
 
 /**
@@ -86,6 +103,7 @@ import com.formdev.flatlaf.util.UIScale;
  * @uiDefault FileChooser.folderNameLabelText					String
  * @uiDefault FileChooser.filesOfTypeLabelMnemonic				String
  * @uiDefault FileChooser.filesOfTypeLabelText					String
+ *
  * @uiDefault FileChooser.upFolderToolTipText					String
  * @uiDefault FileChooser.upFolderAccessibleName				String
  * @uiDefault FileChooser.homeFolderToolTipText					String
@@ -97,11 +115,27 @@ import com.formdev.flatlaf.util.UIScale;
  * @uiDefault FileChooser.detailsViewButtonToolTipText			String
  * @uiDefault FileChooser.detailsViewButtonAccessibleName		String
  *
+ * <!-- FilePane -->
+ *
+ * @uiDefault FileChooser.fileNameHeaderText					String
+ * @uiDefault FileChooser.fileSizeHeaderText					String
+ * @uiDefault FileChooser.fileTypeHeaderText					String
+ * @uiDefault FileChooser.fileDateHeaderText					String
+ * @uiDefault FileChooser.fileAttrHeaderText					String
+ *
+ * @uiDefault FileChooser.viewMenuLabelText						String
+ * @uiDefault FileChooser.refreshActionLabelText				String
+ * @uiDefault FileChooser.newFolderActionLabelText				String
+ * @uiDefault FileChooser.listViewActionLabelText				String
+ * @uiDefault FileChooser.detailsViewActionLabelText			String
+ *
  * @author Karl Tauber
  */
 public class FlatFileChooserUI
 	extends MetalFileChooserUI
 {
+	private final FlatFileView fileView = new FlatFileView();
+
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatFileChooserUI( (JFileChooser) c );
 	}
@@ -110,6 +144,52 @@ public class FlatFileChooserUI
 		super( filechooser );
 	}
 
+	@Override
+	public void installComponents( JFileChooser fc ) {
+		super.installComponents( fc );
+
+		patchUI( fc );
+	}
+
+	private void patchUI( JFileChooser fc ) {
+		// turn top-right buttons into toolbar buttons
+		Component topPanel = fc.getComponent( 0 );
+		if( (topPanel instanceof JPanel) &&
+			(((JPanel)topPanel).getLayout() instanceof BorderLayout) )
+		{
+			Component topButtonPanel = ((JPanel)topPanel).getComponent( 0 );
+			if( (topButtonPanel instanceof JPanel) &&
+				(((JPanel)topButtonPanel).getLayout() instanceof BoxLayout) )
+			{
+				Insets margin = UIManager.getInsets( "Button.margin" );
+				Component[] comps = ((JPanel)topButtonPanel).getComponents();
+				for( int i = comps.length - 1; i >= 0; i-- ) {
+					Component c = comps[i];
+					if( c instanceof JButton || c instanceof JToggleButton ) {
+						AbstractButton b = (AbstractButton)c;
+						b.putClientProperty( FlatClientProperties.BUTTON_TYPE,
+							FlatClientProperties.BUTTON_TYPE_TOOLBAR_BUTTON );
+						b.setMargin( margin );
+						b.setFocusable( false );
+					} else if( c instanceof Box.Filler )
+						((JPanel)topButtonPanel).remove( i );
+				}
+			}
+		}
+
+		// increase maximum row count of directory combo box popup list
+		try {
+			Component directoryComboBox =  ((JPanel)topPanel).getComponent( 2 );
+			if( directoryComboBox instanceof JComboBox ) {
+				int maximumRowCount = UIManager.getInt( "ComboBox.maximumRowCount" );
+				if( maximumRowCount > 0 )
+					((JComboBox<?>)directoryComboBox).setMaximumRowCount( maximumRowCount );
+			}
+		} catch( ArrayIndexOutOfBoundsException ex ) {
+			// ignore
+		}
+	}
+
 	@Override
 	public Dimension getPreferredSize( JComponent c ) {
 		return UIScale.scale( super.getPreferredSize( c ) );
@@ -119,4 +199,50 @@ public class FlatFileChooserUI
 	public Dimension getMinimumSize( JComponent c ) {
 		return UIScale.scale( super.getMinimumSize( c ) );
 	}
+
+	@Override
+	public FileView getFileView( JFileChooser fc ) {
+		return fileView;
+	}
+
+	@Override
+	public void clearIconCache() {
+		fileView.clearIconCache();
+	}
+
+	//---- class FlatFileView -------------------------------------------------
+
+	private class FlatFileView
+		extends BasicFileView
+	{
+		@Override
+		public Icon getIcon( File f ) {
+			// get cached icon
+			Icon icon = getCachedIcon( f );
+			if( icon != null )
+				return icon;
+
+			// get system icon
+			if( f != null ) {
+				icon = getFileChooser().getFileSystemView().getSystemIcon( f );
+
+				if( icon != null ) {
+					if( icon instanceof ImageIcon )
+						icon = new ScaledImageIcon( (ImageIcon) icon );
+					cacheIcon( f, icon );
+					return icon;
+				}
+			}
+
+			// get default icon
+			icon = super.getIcon( f );
+
+			if( icon instanceof ImageIcon ) {
+				icon = new ScaledImageIcon( (ImageIcon) icon );
+				cacheIcon( f, icon );
+			}
+
+			return icon;
+		}
+	}
 }

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

@@ -45,6 +45,7 @@ import javax.swing.plaf.ComponentUI;
  * @uiDefault Component.isIntelliJTheme					boolean
  * @uiDefault FormattedTextField.placeholderForeground	Color
  * @uiDefault TextComponent.selectAllOnFocusPolicy		String	never, once (default) or always
+ * @uiDefault TextComponent.selectAllOnMouseClick		boolean
  *
  * @author Karl Tauber
  */

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

@@ -26,13 +26,14 @@ import java.beans.PropertyChangeListener;
 import javax.swing.BorderFactory;
 import javax.swing.BoxLayout;
 import javax.swing.Icon;
+import javax.swing.ImageIcon;
 import javax.swing.JInternalFrame;
 import javax.swing.JLabel;
 import javax.swing.JPanel;
 import javax.swing.LookAndFeel;
-import javax.swing.UIManager;
 import javax.swing.border.Border;
 import javax.swing.plaf.basic.BasicInternalFrameTitlePane;
+import com.formdev.flatlaf.util.ScaledImageIcon;
 import com.formdev.flatlaf.util.UIScale;
 
 /**
@@ -91,7 +92,21 @@ public class FlatInternalFrameTitlePane
 		updateFrameIcon();
 		updateColors();
 
-		buttonPanel = new JPanel();
+		buttonPanel = new JPanel() {
+			@Override
+			public Dimension getPreferredSize() {
+				Dimension size = super.getPreferredSize();
+				int height = size.height;
+				// use height of invisible buttons to always have same title pane height
+				if( !iconButton.isVisible() )
+					height = Math.max( height, iconButton.getPreferredSize().height );
+				if( !maxButton.isVisible() )
+					height = Math.max( height, maxButton.getPreferredSize().height );
+				if( !closeButton.isVisible() )
+					height = Math.max( height, closeButton.getPreferredSize().height );
+				return new Dimension( size.width, height );
+			}
+		};
 		buttonPanel.setLayout( new BoxLayout( buttonPanel, BoxLayout.LINE_AXIS ) );
 		buttonPanel.setOpaque( false );
 
@@ -103,14 +118,16 @@ public class FlatInternalFrameTitlePane
 		add( buttonPanel, BorderLayout.LINE_END );
 	}
 
-	private void updateFrameIcon() {
+	protected void updateFrameIcon() {
 		Icon frameIcon = frame.getFrameIcon();
-		if( frameIcon == UIManager.getIcon( "InternalFrame.icon" ) )
+		if( frameIcon != null && (frameIcon.getIconWidth() == 0 || frameIcon.getIconHeight() == 0) )
 			frameIcon = null;
+		else if( frameIcon instanceof ImageIcon )
+			frameIcon = new ScaledImageIcon( (ImageIcon) frameIcon );
 		titleLabel.setIcon( frameIcon );
 	}
 
-	private void updateColors() {
+	protected void updateColors() {
 		Color background = FlatUIUtils.nonUIResource( frame.isSelected() ? selectedTitleColor : notSelectedTitleColor );
 		Color foreground = FlatUIUtils.nonUIResource( frame.isSelected() ? selectedTextColor : notSelectedTextColor );
 
@@ -123,7 +140,7 @@ public class FlatInternalFrameTitlePane
 		closeButton.setForeground( foreground );
 	}
 
-	private void updateButtonsVisibility() {
+	protected void updateButtonsVisibility() {
 		iconButton.setVisible( frame.isIconifiable() );
 		maxButton.setVisible( frame.isMaximizable() );
 		closeButton.setVisible( frame.isClosable() );
@@ -150,7 +167,7 @@ public class FlatInternalFrameTitlePane
 
 	//---- class FlatPropertyChangeHandler ------------------------------------
 
-	private class FlatPropertyChangeHandler
+	protected class FlatPropertyChangeHandler
 		extends PropertyChangeHandler
 	{
 		@Override

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

@@ -84,6 +84,8 @@ import javax.swing.plaf.basic.BasicInternalFrameUI;
 public class FlatInternalFrameUI
 	extends BasicInternalFrameUI
 {
+	protected FlatWindowResizer windowResizer;
+
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatInternalFrameUI( (JInternalFrame) c );
 	}
@@ -97,6 +99,18 @@ public class FlatInternalFrameUI
 		super.installUI( c );
 
 		LookAndFeel.installProperty( frame, "opaque", false );
+
+		windowResizer = createWindowResizer();
+	}
+
+	@Override
+	public void uninstallUI( JComponent c ) {
+		super.uninstallUI( c );
+
+		if( windowResizer != null ) {
+			windowResizer.uninstall();
+			windowResizer = null;
+		}
 	}
 
 	@Override
@@ -104,6 +118,10 @@ public class FlatInternalFrameUI
 		return new FlatInternalFrameTitlePane( w );
 	}
 
+	protected FlatWindowResizer createWindowResizer() {
+		return new FlatWindowResizer.InternalFrameResizer( frame, this::getDesktopManager );
+	}
+
 	//---- class FlatInternalFrameBorder --------------------------------------
 
 	public static class FlatInternalFrameBorder
@@ -112,6 +130,16 @@ public class FlatInternalFrameUI
 		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" );
+
+		private final FlatDropShadowBorder activeDropShadowBorder = new FlatDropShadowBorder(
+			UIManager.getColor( "InternalFrame.activeDropShadowColor" ),
+			UIManager.getInsets( "InternalFrame.activeDropShadowInsets" ),
+			FlatUIUtils.getUIFloat( "InternalFrame.activeDropShadowOpacity", 0.5f ) );
+		private final FlatDropShadowBorder inactiveDropShadowBorder = new FlatDropShadowBorder(
+			UIManager.getColor( "InternalFrame.inactiveDropShadowColor" ),
+			UIManager.getInsets( "InternalFrame.inactiveDropShadowInsets" ),
+			FlatUIUtils.getUIFloat( "InternalFrame.inactiveDropShadowOpacity", 0.5f ) );
 
 		public FlatInternalFrameBorder() {
 			super( UIManager.getInsets( "InternalFrame.borderMargins" ) );
@@ -137,16 +165,31 @@ public class FlatInternalFrameUI
 			Insets insets = getBorderInsets( c );
 			float lineWidth = scale( (float) borderLineWidth );
 
+			float rx = x + insets.left - lineWidth;
+			float ry = y + insets.top - lineWidth;
+			float rwidth = width - insets.left - insets.right + (lineWidth * 2);
+			float rheight = height - insets.top - insets.bottom + (lineWidth * 2);
+
 			Graphics2D g2 = (Graphics2D) g.create();
 			try {
 				FlatUIUtils.setRenderingHints( g2 );
 				g2.setColor( f.isSelected() ? activeBorderColor : inactiveBorderColor );
-				g2.fill( FlatUIUtils.createRectangle(
-					x + insets.left - lineWidth,
-					y + insets.top - lineWidth,
-					width - insets.left - insets.right + (lineWidth * 2),
-					height - insets.top - insets.bottom + (lineWidth * 2),
-					lineWidth ) );
+
+				// paint drop shadow
+				if( dropShadowPainted ) {
+					FlatDropShadowBorder dropShadowBorder = f.isSelected()
+						? activeDropShadowBorder : inactiveDropShadowBorder;
+
+					Insets dropShadowInsets = dropShadowBorder.getBorderInsets();
+					dropShadowBorder.paintBorder( c, g2,
+						(int) rx - dropShadowInsets.left,
+						(int) ry - dropShadowInsets.top,
+						(int) rwidth + dropShadowInsets.left + dropShadowInsets.right,
+						(int) rheight + dropShadowInsets.top + dropShadowInsets.bottom );
+				}
+
+				// paint border
+				g2.fill( FlatUIUtils.createRectangle( rx, ry, rwidth, rheight, lineWidth ) );
 			} finally {
 				g2.dispose();
 			}

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

@@ -19,6 +19,7 @@ package com.formdev.flatlaf.ui;
 import java.awt.Color;
 import java.awt.FontMetrics;
 import java.awt.Graphics;
+import java.awt.Graphics2D;
 import java.awt.Rectangle;
 import java.beans.PropertyChangeEvent;
 import javax.swing.Icon;
@@ -30,6 +31,7 @@ import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicHTML;
 import javax.swing.plaf.basic.BasicLabelUI;
 import com.formdev.flatlaf.FlatLaf;
+import com.formdev.flatlaf.util.HiDPIUtils;
 import com.formdev.flatlaf.util.UIScale;
 
 /**
@@ -54,12 +56,8 @@ public class FlatLabelUI
 
 	private boolean defaults_initialized = false;
 
-	private static ComponentUI instance;
-
 	public static ComponentUI createUI( JComponent c ) {
-		if( instance == null )
-			instance = new FlatLabelUI();
-		return instance;
+		return FlatUIUtils.createSharedUI( FlatLabelUI.class, FlatLabelUI::new );
 	}
 
 	@Override
@@ -124,6 +122,17 @@ public class FlatLabelUI
 		BasicHTML.updateRenderer( c, text );
 	}
 
+	static Graphics createGraphicsHTMLTextYCorrection( Graphics g, JComponent c ) {
+		return (c.getClientProperty( BasicHTML.propertyKey ) != null)
+			? HiDPIUtils.createGraphicsTextYCorrection( (Graphics2D) g )
+			: g;
+	}
+
+	@Override
+	public void paint( Graphics g, JComponent c ) {
+		super.paint( createGraphicsHTMLTextYCorrection( g, c ), c );
+	}
+
 	@Override
 	protected void paintEnabledText( JLabel l, Graphics g, String s, int textX, int textY ) {
 		int mnemIndex = FlatLaf.isShowMnemonics() ? l.getDisplayedMnemonicIndex() : -1;

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

@@ -26,9 +26,9 @@ import java.awt.Insets;
 /**
  * Line border for various components.
  *
- * Paints a scaled 1px thick line around the component.
- * The line thickness is not included in the border insets.
- * The insets should be at least 1,1,1,1.
+ * Paints a scaled (usually 1px thick) line around the component.
+ * The line thickness is not added to the border insets.
+ * The insets should be at least have line thickness (usually 1,1,1,1).
  *
  * @author Karl Tauber
  */
@@ -36,10 +36,24 @@ public class FlatLineBorder
 	extends FlatEmptyBorder
 {
 	private final Color lineColor;
+	private final float lineThickness;
 
 	public FlatLineBorder( Insets insets, Color lineColor ) {
+		this( insets, lineColor, 1f );
+	}
+
+	public FlatLineBorder( Insets insets, Color lineColor, float lineThickness ) {
 		super( insets );
 		this.lineColor = lineColor;
+		this.lineThickness = lineThickness;
+	}
+
+	public Color getLineColor() {
+		return lineColor;
+	}
+
+	public float getLineThickness() {
+		return lineThickness;
 	}
 
 	@Override
@@ -48,7 +62,7 @@ public class FlatLineBorder
 		try {
 			FlatUIUtils.setRenderingHints( g2 );
 			g2.setColor( lineColor );
-			FlatUIUtils.paintComponentBorder( g2, x, y, width, height, 0f, scale( 1f ), 0f );
+			FlatUIUtils.paintComponentBorder( g2, x, y, width, height, 0f, scale( lineThickness ), 0f );
 		} finally {
 			g2.dispose();
 		}

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

@@ -17,6 +17,7 @@
 package com.formdev.flatlaf.ui;
 
 import java.awt.Color;
+import java.awt.EventQueue;
 import java.awt.event.FocusEvent;
 import java.awt.event.FocusListener;
 import javax.swing.JComponent;
@@ -81,7 +82,7 @@ public class FlatListUI
 		selectionInactiveBackground = UIManager.getColor( "List.selectionInactiveBackground" );
 		selectionInactiveForeground = UIManager.getColor( "List.selectionInactiveForeground" );
 
-		toggleSelectionColors( list.hasFocus() );
+		toggleSelectionColors();
 	}
 
 	@Override
@@ -100,13 +101,17 @@ public class FlatListUI
 			@Override
 			public void focusGained( FocusEvent e ) {
 				super.focusGained( e );
-				toggleSelectionColors( true );
+				toggleSelectionColors();
 			}
 
 			@Override
 			public void focusLost( FocusEvent e ) {
 				super.focusLost( e );
-				toggleSelectionColors( false );
+
+				// use invokeLater for the case that the window is deactivated
+				EventQueue.invokeLater( () -> {
+					toggleSelectionColors();
+				} );
 			}
 		};
 	}
@@ -120,8 +125,11 @@ public class FlatListUI
 	 * already used in applications. Then either the inactive colors are not used,
 	 * or the application has to be changed to extend a FlatLaf renderer.
 	 */
-	private void toggleSelectionColors( boolean focused ) {
-		if( focused ) {
+	private void toggleSelectionColors() {
+		if( list == null )
+			return;
+
+		if( FlatUIUtils.isPermanentFocusOwner( list ) ) {
 			if( list.getSelectionBackground() == selectionInactiveBackground )
 				list.setSelectionBackground( selectionBackground );
 			if( list.getSelectionForeground() == selectionInactiveForeground )

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

@@ -20,9 +20,7 @@ import static com.formdev.flatlaf.util.UIScale.scale;
 import java.awt.Color;
 import java.awt.Component;
 import java.awt.Graphics;
-import java.awt.Graphics2D;
 import java.awt.Insets;
-import java.awt.geom.Rectangle2D;
 import javax.swing.JMenuBar;
 import javax.swing.UIManager;
 
@@ -40,16 +38,8 @@ public class FlatMenuBarBorder
 
 	@Override
 	public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
-		Graphics2D g2 = (Graphics2D) g.create();
-		try {
-			float lineHeight = scale( (float) 1 );
-
-			FlatUIUtils.setRenderingHints( g2 );
-			g2.setColor( borderColor );
-			g2.fill( new Rectangle2D.Float( x, y + height - lineHeight, width, lineHeight ) );
-		} finally {
-			g2.dispose();
-		}
+		float lineHeight = scale( (float) 1 );
+		FlatUIUtils.paintFilledRectangle( g, borderColor, x, y + height - lineHeight, width, lineHeight );
 	}
 
 	@Override

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

@@ -16,9 +16,20 @@
 
 package com.formdev.flatlaf.ui;
 
+import java.awt.event.ActionEvent;
+import javax.swing.AbstractAction;
+import javax.swing.ActionMap;
 import javax.swing.JComponent;
+import javax.swing.JMenu;
+import javax.swing.JMenuBar;
+import javax.swing.MenuElement;
+import javax.swing.MenuSelectionManager;
+import javax.swing.SwingUtilities;
+import javax.swing.plaf.ActionMapUIResource;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicMenuBarUI;
+import com.formdev.flatlaf.FlatLaf;
+import com.formdev.flatlaf.util.SystemInfo;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JMenuBar}.
@@ -38,4 +49,45 @@ public class FlatMenuBarUI
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatMenuBarUI();
 	}
+
+	/*
+	 * WARNING: This class is not used on macOS if screen menu bar is enabled.
+	 *          Do not add any functionality here.
+	 */
+
+	@Override
+	protected void installKeyboardActions() {
+		super.installKeyboardActions();
+
+		ActionMap map = SwingUtilities.getUIActionMap( menuBar );
+		if( map == null ) {
+			map = new ActionMapUIResource();
+			SwingUtilities.replaceUIActionMap( menuBar, map );
+		}
+		map.put( "takeFocus", new TakeFocus() );
+	}
+
+	//---- class TakeFocus ----------------------------------------------------
+
+	/**
+	 * Activates the menu bar and shows mnemonics.
+	 * On Windows, the popup of the first menu is not shown.
+	 * On other platforms, the popup of the first menu is shown.
+	 */
+	private static class TakeFocus
+		extends AbstractAction
+	{
+		@Override
+		public void actionPerformed( ActionEvent e ) {
+			JMenuBar menuBar = (JMenuBar) e.getSource();
+			JMenu menu = menuBar.getMenu( 0 );
+			if( menu != null ) {
+				MenuSelectionManager.defaultManager().setSelectedPath( SystemInfo.isWindows
+					? new MenuElement[] { menuBar, menu }
+					: new MenuElement[] { menuBar, menu, menu.getPopupMenu() } );
+
+				FlatLaf.showMnemonics( menuBar );
+			}
+		}
+	}
 }

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

@@ -40,7 +40,7 @@ public class FlatMenuItemBorder
 		if( c.getParent() instanceof JMenuBar ) {
 			insets.top = scale( menuBarItemMargins.top );
 			insets.left = scale( menuBarItemMargins.left );
-			insets.bottom = scale( menuBarItemMargins.bottom + 1 );
+			insets.bottom = scale( menuBarItemMargins.bottom );
 			insets.right = scale( menuBarItemMargins.right );
 			return insets;
 		} else

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

@@ -0,0 +1,578 @@
+/*
+ * Copyright 2020 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 static com.formdev.flatlaf.util.UIScale.scale;
+import java.awt.Color;
+import java.awt.Component;
+import java.awt.Dimension;
+import java.awt.Font;
+import java.awt.FontMetrics;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.Insets;
+import java.awt.Paint;
+import java.awt.Rectangle;
+import java.awt.event.InputEvent;
+import java.awt.event.KeyEvent;
+import java.text.AttributedCharacterIterator;
+import javax.swing.Icon;
+import javax.swing.JMenu;
+import javax.swing.JMenuItem;
+import javax.swing.KeyStroke;
+import javax.swing.SwingUtilities;
+import javax.swing.UIManager;
+import javax.swing.plaf.basic.BasicHTML;
+import javax.swing.text.View;
+import com.formdev.flatlaf.FlatLaf;
+import com.formdev.flatlaf.util.DerivedColor;
+import com.formdev.flatlaf.util.Graphics2DProxy;
+import com.formdev.flatlaf.util.HiDPIUtils;
+import com.formdev.flatlaf.util.SystemInfo;
+
+/**
+ * Renderer for menu items.
+ *
+ * @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.underlineSelectionBackground					Color
+ * @uiDefault MenuItem.underlineSelectionCheckBackground			Color
+ * @uiDefault MenuItem.underlineSelectionColor						Color
+ * @uiDefault MenuItem.underlineSelectionHeight						int
+ *
+ * @author Karl Tauber
+ */
+public class FlatMenuItemRenderer
+{
+	protected final JMenuItem menuItem;
+	protected final Icon checkIcon;
+	protected final Icon arrowIcon;
+	protected final 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 );
+
+	protected final Color checkBackground = UIManager.getColor( "MenuItem.checkBackground" );
+	protected final 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" );
+
+	protected FlatMenuItemRenderer( JMenuItem menuItem, Icon checkIcon, Icon arrowIcon,
+		Font acceleratorFont, String acceleratorDelimiter )
+	{
+		this.menuItem = menuItem;
+		this.checkIcon = checkIcon;
+		this.arrowIcon = arrowIcon;
+		this.acceleratorFont = acceleratorFont;
+		this.acceleratorDelimiter = acceleratorDelimiter;
+
+		Dimension minimumIconSize = UIManager.getDimension( "MenuItem.minimumIconSize" );
+		this.minimumIconSize = (minimumIconSize != null) ? minimumIconSize : new Dimension( 16, 16 );
+	}
+
+	protected Dimension getPreferredMenuItemSize() {
+		int width = 0;
+		int height = 0;
+		boolean isTopLevelMenu = isTopLevelMenu( menuItem );
+
+		Rectangle viewRect = new Rectangle( 0, 0, Integer.MAX_VALUE, Integer.MAX_VALUE );
+		Rectangle iconRect = new Rectangle();
+		Rectangle textRect = new Rectangle();
+
+		// layout icon and text
+		SwingUtilities.layoutCompoundLabel( menuItem,
+			menuItem.getFontMetrics( menuItem.getFont() ), menuItem.getText(), getIconForLayout(),
+			menuItem.getVerticalAlignment(), menuItem.getHorizontalAlignment(),
+			menuItem.getVerticalTextPosition(), menuItem.getHorizontalTextPosition(),
+			viewRect, iconRect, textRect, scale( menuItem.getIconTextGap() ) );
+
+		// union icon and text rectangles
+		Rectangle labelRect = iconRect.union( textRect );
+		width += labelRect.width;
+		height = Math.max( labelRect.height, height );
+
+		// accelerator size
+		String accelText = getAcceleratorText();
+		if( accelText != null ) {
+			// gap between text and accelerator
+			width += scale( !isTopLevelMenu ? textAcceleratorGap : menuItem.getIconTextGap() );
+
+			FontMetrics accelFm = menuItem.getFontMetrics( acceleratorFont );
+			width += SwingUtilities.computeStringWidth( accelFm, accelText );
+			height = Math.max( accelFm.getHeight(), height );
+		}
+
+		// arrow size
+		if( !isTopLevelMenu && arrowIcon != null ) {
+			// gap between text and arrow
+			if( accelText == null )
+				width += scale( textNoAcceleratorGap );
+
+			// gap between accelerator and arrow
+			width += scale( acceleratorArrowGap );
+
+			width += arrowIcon.getIconWidth();
+			height = Math.max( arrowIcon.getIconHeight(), height );
+		}
+
+		// add insets
+		Insets insets = menuItem.getInsets();
+		width += insets.left + insets.right;
+		height += insets.top + insets.bottom;
+
+		// minimum width
+		if( !isTopLevelMenu ) {
+			int minimumWidth = FlatUIUtils.minimumWidth( menuItem, this.minimumWidth );
+			width = Math.max( width, scale( minimumWidth ) );
+		}
+
+		return new Dimension( width, height );
+	}
+
+	private void layout( Rectangle viewRect, Rectangle iconRect, Rectangle textRect,
+		Rectangle accelRect, Rectangle arrowRect, Rectangle labelRect )
+	{
+		boolean isTopLevelMenu = isTopLevelMenu( menuItem );
+
+		// layout arrow
+		if( !isTopLevelMenu && arrowIcon != null ) {
+			arrowRect.width = arrowIcon.getIconWidth();
+			arrowRect.height = arrowIcon.getIconHeight();
+		} else
+			arrowRect.setSize( 0, 0 );
+		arrowRect.y = viewRect.y + centerOffset( viewRect.height, arrowRect.height );
+
+		// layout accelerator
+		String accelText = getAcceleratorText();
+		if( accelText != null ) {
+			FontMetrics accelFm = menuItem.getFontMetrics( acceleratorFont );
+			accelRect.width = SwingUtilities.computeStringWidth( accelFm, accelText );
+			accelRect.height = accelFm.getHeight();
+
+			accelRect.y = viewRect.y + centerOffset( viewRect.height, accelRect.height );
+		} else
+			accelRect.setBounds( 0, 0, 0, 0 );
+
+		// compute horizontal positions of accelerator and arrow
+		int accelArrowGap = !isTopLevelMenu ? scale( acceleratorArrowGap ) : 0;
+		if( menuItem.getComponentOrientation().isLeftToRight() ) {
+			// left-to-right
+			arrowRect.x = viewRect.x + viewRect.width - arrowRect.width;
+			accelRect.x = arrowRect.x - accelArrowGap - accelRect.width;
+		} else {
+			// right-to-left
+			arrowRect.x = viewRect.x;
+			accelRect.x = arrowRect.x + accelArrowGap + arrowRect.width;
+		}
+
+		// width of accelerator, arrow and gap
+		int accelArrowWidth = accelRect.width + arrowRect.width;
+		if( accelText != null )
+			accelArrowWidth += scale( !isTopLevelMenu ? textAcceleratorGap : menuItem.getIconTextGap() );
+		if( !isTopLevelMenu && arrowIcon != null ) {
+			if( accelText == null )
+				accelArrowWidth += scale( textNoAcceleratorGap );
+			accelArrowWidth += scale( acceleratorArrowGap );
+		}
+
+		// label rectangle is view rectangle subtracted by accelerator, arrow and gap
+		labelRect.setBounds( viewRect );
+		labelRect.width -= accelArrowWidth;
+		if( !menuItem.getComponentOrientation().isLeftToRight() )
+			labelRect.x += accelArrowWidth;
+
+		// layout icon and text
+		SwingUtilities.layoutCompoundLabel( menuItem,
+			menuItem.getFontMetrics( menuItem.getFont() ), menuItem.getText(), getIconForLayout(),
+			menuItem.getVerticalAlignment(), menuItem.getHorizontalAlignment(),
+			menuItem.getVerticalTextPosition(), menuItem.getHorizontalTextPosition(),
+			labelRect, iconRect, textRect, scale( menuItem.getIconTextGap() ) );
+	}
+
+	private static int centerOffset( int wh1, int wh2 ) {
+		return (wh1 / 2) - (wh2 / 2);
+	}
+
+	protected void paintMenuItem( Graphics g, Color selectionBackground, Color selectionForeground,
+		Color disabledForeground, Color acceleratorForeground, Color acceleratorSelectionForeground )
+	{
+		Rectangle viewRect = new Rectangle( menuItem.getWidth(), menuItem.getHeight() );
+
+		// subtract insets
+		Insets insets = menuItem.getInsets();
+		viewRect.x += insets.left;
+		viewRect.y += insets.top;
+		viewRect.width -= (insets.left + insets.right);
+		viewRect.height -= (insets.top + insets.bottom);
+
+		Rectangle iconRect = new Rectangle();
+		Rectangle textRect = new Rectangle();
+		Rectangle accelRect = new Rectangle();
+		Rectangle arrowRect = new Rectangle();
+		Rectangle labelRect = new Rectangle();
+
+		layout( viewRect, iconRect, textRect, accelRect, arrowRect, labelRect );
+
+/*debug
+		g.setColor( Color.green ); g.drawRect( viewRect.x, viewRect.y, viewRect.width - 1, viewRect.height - 1 );
+		g.setColor( Color.red ); g.drawRect( labelRect.x, labelRect.y, labelRect.width - 1, labelRect.height - 1 );
+		g.setColor( Color.blue ); g.drawRect( iconRect.x, iconRect.y, iconRect.width - 1, iconRect.height - 1 );
+		g.setColor( Color.cyan ); g.drawRect( textRect.x, textRect.y, textRect.width - 1, textRect.height - 1 );
+		g.setColor( Color.magenta ); g.drawRect( accelRect.x, accelRect.y, accelRect.width - 1, accelRect.height - 1 );
+		g.setColor( Color.orange ); g.drawRect( arrowRect.x, arrowRect.y, arrowRect.width - 1, arrowRect.height - 1 );
+debug*/
+
+		boolean underlineSelection = isUnderlineSelection();
+		paintBackground( g, underlineSelection ? underlineSelectionBackground : selectionBackground );
+		if( underlineSelection && isArmedOrSelected( menuItem ) )
+			paintUnderlineSelection( g, underlineSelectionColor, underlineSelectionHeight );
+		paintIcon( g, iconRect, getIconForPainting(), underlineSelection ? underlineSelectionCheckBackground : checkBackground );
+		paintText( g, textRect, menuItem.getText(), selectionForeground, disabledForeground );
+		paintAccelerator( g, accelRect, getAcceleratorText(), acceleratorForeground, acceleratorSelectionForeground, disabledForeground );
+		if( !isTopLevelMenu( menuItem ) )
+			paintArrowIcon( g, arrowRect, arrowIcon );
+	}
+
+	protected void paintBackground( Graphics g, Color selectionBackground ) {
+		boolean armedOrSelected = isArmedOrSelected( menuItem );
+		if( menuItem.isOpaque() || armedOrSelected ) {
+			// paint background
+			g.setColor( armedOrSelected
+				? deriveBackground( selectionBackground )
+				: menuItem.getBackground() );
+			g.fillRect( 0, 0, menuItem.getWidth(), menuItem.getHeight() );
+		}
+	}
+
+	protected void paintUnderlineSelection( Graphics g, Color underlineSelectionColor, int underlineSelectionHeight ) {
+		int width = menuItem.getWidth();
+		int height = menuItem.getHeight();
+
+		int underlineHeight = scale( underlineSelectionHeight );
+		g.setColor( underlineSelectionColor );
+		if( isTopLevelMenu( menuItem ) ) {
+			// paint underline at bottom
+			g.fillRect( 0, height - underlineHeight, width, underlineHeight );
+		} else if( menuItem.getComponentOrientation().isLeftToRight() ) {
+			// paint underline at left side
+			g.fillRect( 0, 0, underlineHeight, height );
+		} else {
+			// paint underline at right side
+			g.fillRect( width - underlineHeight, 0, underlineHeight, height );
+		}
+	}
+
+	protected Color deriveBackground( Color background ) {
+		if( !(background instanceof DerivedColor) )
+			return background;
+
+		Color baseColor = menuItem.isOpaque()
+			? menuItem.getBackground()
+			: FlatUIUtils.getParentBackground( menuItem );
+
+		return FlatUIUtils.deriveColor( background, baseColor );
+	}
+
+	protected void paintIcon( Graphics g, Rectangle iconRect, Icon icon, Color checkBackground ) {
+		// 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 ) {
+			Rectangle r = FlatUIUtils.addInsets( iconRect, scale( checkMargins ) );
+			g.setColor( deriveBackground( checkBackground ) );
+			g.fillRect( r.x, r.y, r.width, r.height );
+		}
+
+		paintIcon( g, menuItem, icon, iconRect );
+	}
+
+	protected void paintText( Graphics g, Rectangle textRect, String text, Color selectionForeground, Color disabledForeground ) {
+		View htmlView = (View) menuItem.getClientProperty( BasicHTML.propertyKey );
+		if( htmlView != null ) {
+			paintHTMLText( g, menuItem, textRect, htmlView, isUnderlineSelection() ? null : selectionForeground );
+			return;
+		}
+
+		int mnemonicIndex = FlatLaf.isShowMnemonics() ? menuItem.getDisplayedMnemonicIndex() : -1;
+		Color foreground = (isTopLevelMenu( menuItem ) ? menuItem.getParent() : menuItem).getForeground();
+
+		paintText( g, menuItem, textRect, text, mnemonicIndex, menuItem.getFont(),
+			foreground, isUnderlineSelection() ? foreground : selectionForeground, disabledForeground );
+	}
+
+	protected void paintAccelerator( Graphics g, Rectangle accelRect, String accelText,
+		Color foreground, Color selectionForeground, Color disabledForeground )
+	{
+		paintText( g, menuItem, accelRect, accelText, -1, acceleratorFont,
+			foreground, isUnderlineSelection() ? foreground : selectionForeground, disabledForeground );
+	}
+
+	protected void paintArrowIcon( Graphics g, Rectangle arrowRect, Icon arrowIcon ) {
+		paintIcon( g, menuItem, arrowIcon, arrowRect );
+	}
+
+	protected static void paintIcon( Graphics g, JMenuItem menuItem, Icon icon, Rectangle iconRect ) {
+		if( icon == null )
+			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 );
+	}
+
+	protected static void paintText( Graphics g, JMenuItem menuItem,
+		Rectangle textRect, String text, int mnemonicIndex, Font font,
+		Color foreground, Color selectionForeground, Color disabledForeground )
+	{
+		if( text == null || text.isEmpty() )
+			return;
+
+		FontMetrics fm = menuItem.getFontMetrics( font );
+
+		Font oldFont = g.getFont();
+		g.setFont( font );
+		g.setColor( !menuItem.isEnabled()
+			? disabledForeground
+			: (isArmedOrSelected( menuItem )
+				? selectionForeground
+				: foreground) );
+
+		FlatUIUtils.drawStringUnderlineCharAt( menuItem, g, text, mnemonicIndex,
+			textRect.x, textRect.y + fm.getAscent() );
+
+		g.setFont( oldFont );
+	}
+
+	protected static void paintHTMLText( Graphics g, JMenuItem menuItem,
+		Rectangle textRect, View htmlView, Color selectionForeground )
+	{
+		if( isArmedOrSelected( menuItem ) && selectionForeground != null )
+			g = new GraphicsProxyWithTextColor( (Graphics2D) g, selectionForeground );
+
+		htmlView.paint( HiDPIUtils.createGraphicsTextYCorrection( (Graphics2D) g ), textRect );
+	}
+
+	protected static boolean isArmedOrSelected( JMenuItem menuItem ) {
+		return menuItem.isArmed() || (menuItem instanceof JMenu && menuItem.isSelected());
+	}
+
+	protected static boolean isTopLevelMenu( JMenuItem menuItem ) {
+		return menuItem instanceof JMenu && ((JMenu)menuItem).isTopLevelMenu();
+	}
+
+	protected boolean isUnderlineSelection() {
+		return "underline".equals( UIManager.getString( "MenuItem.selectionType" ) );
+	}
+
+	private Icon getIconForPainting() {
+		Icon icon = menuItem.getIcon();
+
+		if( icon == null && checkIcon != null && !isTopLevelMenu( menuItem ) )
+			return checkIcon;
+
+		if( icon == null )
+			return null;
+
+		if( !menuItem.isEnabled() )
+			return menuItem.getDisabledIcon();
+
+		if( menuItem.getModel().isPressed() && menuItem.isArmed() ) {
+			Icon pressedIcon = menuItem.getPressedIcon();
+			if( pressedIcon != null )
+				return pressedIcon;
+		}
+
+		return icon;
+	}
+
+	private Icon getIconForLayout() {
+		Icon icon = menuItem.getIcon();
+
+		if( isTopLevelMenu( menuItem ) )
+			return (icon != null) ? new MinSizeIcon( icon ) : null;
+
+		return new MinSizeIcon( (icon != null) ? icon : checkIcon );
+	}
+
+	private KeyStroke cachedAccelerator;
+	private String cachedAcceleratorText;
+	private boolean cachedAcceleratorLeftToRight;
+
+	private String getAcceleratorText() {
+		KeyStroke accelerator = menuItem.getAccelerator();
+		if( accelerator == null )
+			return null;
+
+		boolean leftToRight = menuItem.getComponentOrientation().isLeftToRight();
+
+		if( accelerator == cachedAccelerator && leftToRight == cachedAcceleratorLeftToRight )
+			return cachedAcceleratorText;
+
+		cachedAccelerator = accelerator;
+		cachedAcceleratorText = getTextForAccelerator( accelerator );
+		cachedAcceleratorLeftToRight = leftToRight;
+
+		return cachedAcceleratorText;
+	}
+
+	protected String getTextForAccelerator( KeyStroke accelerator ) {
+		StringBuilder buf = new StringBuilder();
+		boolean leftToRight = menuItem.getComponentOrientation().isLeftToRight();
+
+		// modifiers
+		int modifiers = accelerator.getModifiers();
+		if( modifiers != 0 ) {
+			if( SystemInfo.isMacOS ) {
+				if( leftToRight )
+					buf.append( getMacOSModifiersExText( modifiers, leftToRight ) );
+			} else
+				buf.append( InputEvent.getModifiersExText( modifiers ) ).append( acceleratorDelimiter );
+		}
+
+		// key
+		int keyCode = accelerator.getKeyCode();
+		if( keyCode != 0 )
+			buf.append( KeyEvent.getKeyText( keyCode ) );
+		else
+			buf.append( accelerator.getKeyChar() );
+
+		// modifiers if right-to-left on macOS
+		if( modifiers != 0 && !leftToRight && SystemInfo.isMacOS )
+			buf.append( getMacOSModifiersExText( modifiers, leftToRight ) );
+
+		return buf.toString();
+	}
+
+	protected String getMacOSModifiersExText( int modifiers, boolean leftToRight ) {
+		StringBuilder buf = new StringBuilder();
+
+		if( (modifiers & InputEvent.CTRL_DOWN_MASK) != 0 )
+			buf.append( controlGlyph );
+		if( (modifiers & (InputEvent.ALT_DOWN_MASK | InputEvent.ALT_GRAPH_DOWN_MASK)) != 0 )
+			buf.append( optionGlyph );
+		if( (modifiers & InputEvent.SHIFT_DOWN_MASK) != 0 )
+			buf.append( shiftGlyph );
+		if( (modifiers & InputEvent.META_DOWN_MASK) != 0 )
+			buf.append( commandGlyph );
+
+		// reverse order for right-to-left
+		if( !leftToRight )
+			buf.reverse();
+
+		return buf.toString();
+	}
+
+	private static final char
+		controlGlyph = 0x2303,
+		optionGlyph = 0x2325,
+		shiftGlyph = 0x21E7,
+		commandGlyph = 0x2318;
+
+	//---- class MinSizeIcon --------------------------------------------------
+
+	private class MinSizeIcon
+		implements Icon
+	{
+		private final Icon delegate;
+
+		MinSizeIcon( Icon delegate ) {
+			this.delegate = delegate;
+		}
+
+		@Override
+		public int getIconWidth() {
+			int iconWidth = (delegate != null) ? delegate.getIconWidth() : 0;
+			return Math.max( iconWidth, scale( minimumIconSize.width ) );
+		}
+
+		@Override
+		public int getIconHeight() {
+			int iconHeight = (delegate != null) ? delegate.getIconHeight() : 0;
+			return Math.max( iconHeight, scale( minimumIconSize.height ) );
+		}
+
+		@Override
+		public void paintIcon( Component c, Graphics g, int x, int y ) {
+		}
+	}
+
+	//---- class GraphicsProxyWithTextColor -----------------------------------
+
+	private static class GraphicsProxyWithTextColor
+		extends Graphics2DProxy
+	{
+		private final Color textColor;
+
+		GraphicsProxyWithTextColor( Graphics2D delegate, Color textColor ) {
+			super( delegate );
+			this.textColor = textColor;
+		}
+
+		@Override
+		public void drawString( String str, int x, int y ) {
+			Paint oldPaint = getPaint();
+			setPaint( textColor );
+			super.drawString( str, x, y );
+			setPaint( oldPaint );
+		}
+
+		@Override
+		public void drawString( String str, float x, float y ) {
+			Paint oldPaint = getPaint();
+			setPaint( textColor );
+			super.drawString( str, x, y );
+			setPaint( oldPaint );
+		}
+
+		@Override
+		public void drawString( AttributedCharacterIterator iterator, int x, int y ) {
+			Paint oldPaint = getPaint();
+			setPaint( textColor );
+			super.drawString( iterator, x, y );
+			setPaint( oldPaint );
+		}
+
+		@Override
+		public void drawString( AttributedCharacterIterator iterator, float x, float y ) {
+			Paint oldPaint = getPaint();
+			setPaint( textColor );
+			super.drawString( iterator, x, y );
+			setPaint( oldPaint );
+		}
+
+		@Override
+		public void drawChars( char[] data, int offset, int length, int x, int y ) {
+			Paint oldPaint = getPaint();
+			setPaint( textColor );
+			super.drawChars( data, offset, length, x, y );
+			setPaint( oldPaint );
+		}
+	}
+}

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

@@ -16,48 +16,47 @@
 
 package com.formdev.flatlaf.ui;
 
-import static com.formdev.flatlaf.util.UIScale.scale;
-import java.awt.Color;
-import java.awt.FontMetrics;
+import java.awt.Dimension;
 import java.awt.Graphics;
-import java.awt.Rectangle;
-import java.beans.PropertyChangeListener;
-import javax.swing.ButtonModel;
+import javax.swing.Icon;
 import javax.swing.JComponent;
-import javax.swing.JMenu;
-import javax.swing.JMenuItem;
+import javax.swing.LookAndFeel;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicMenuItemUI;
-import com.formdev.flatlaf.FlatLaf;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JMenuItem}.
  *
  * <!-- BasicMenuItemUI -->
  *
- * @uiDefault MenuItem.font								Font
- * @uiDefault MenuItem.background						Color
- * @uiDefault MenuItem.foreground						Color
- * @uiDefault MenuItem.disabledForeground				Color
- * @uiDefault MenuItem.selectionBackground				Color
- * @uiDefault MenuItem.selectionForeground				Color
- * @uiDefault MenuItem.acceleratorForeground			Color
- * @uiDefault MenuItem.acceleratorSelectionForeground	Color
- * @uiDefault MenuItem.acceleratorFont					Font		defaults to MenuItem.font
- * @uiDefault MenuItem.acceleratorDelimiter				String
- * @uiDefault MenuItem.border							Border
- * @uiDefault MenuItem.borderPainted					boolean
- * @uiDefault MenuItem.margin							Insets
- * @uiDefault MenuItem.arrowIcon						Icon
- * @uiDefault MenuItem.checkIcon						Icon
- * @uiDefault MenuItem.opaque							boolean
- * @uiDefault MenuItem.evenHeight						boolean
+ * @uiDefault MenuItem.font											Font
+ * @uiDefault MenuItem.background									Color
+ * @uiDefault MenuItem.foreground									Color
+ * @uiDefault MenuItem.disabledForeground							Color
+ * @uiDefault MenuItem.selectionBackground							Color
+ * @uiDefault MenuItem.selectionForeground							Color
+ * @uiDefault MenuItem.acceleratorForeground						Color
+ * @uiDefault MenuItem.acceleratorSelectionForeground				Color
+ * @uiDefault MenuItem.acceleratorFont								Font		defaults to MenuItem.font
+ * @uiDefault MenuItem.acceleratorDelimiter							String
+ * @uiDefault MenuItem.border										Border
+ * @uiDefault MenuItem.borderPainted								boolean
+ * @uiDefault MenuItem.margin										Insets
+ * @uiDefault MenuItem.arrowIcon									Icon
+ * @uiDefault MenuItem.checkIcon									Icon
+ * @uiDefault MenuItem.opaque										boolean
+ *
+ * <!-- FlatMenuItemUI -->
+ *
+ * @uiDefault MenuItem.iconTextGap									int
  *
  * @author Karl Tauber
  */
 public class FlatMenuItemUI
 	extends BasicMenuItemUI
 {
+	private FlatMenuItemRenderer renderer;
+
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatMenuItemUI();
 	}
@@ -66,42 +65,30 @@ public class FlatMenuItemUI
 	protected void installDefaults() {
 		super.installDefaults();
 
-		// scale
-		defaultTextIconGap = scale( defaultTextIconGap );
-	}
+		LookAndFeel.installProperty( menuItem, "iconTextGap", FlatUIUtils.getUIInt( "MenuItem.iconTextGap", 4 ) );
 
-	/**
-	 * Scale defaultTextIconGap again if iconTextGap property has changed.
-	 */
-	@Override
-	protected PropertyChangeListener createPropertyChangeListener( JComponent c ) {
-		PropertyChangeListener superListener = super.createPropertyChangeListener( c );
-		return e -> {
-			superListener.propertyChange( e );
-			if( e.getPropertyName() == "iconTextGap" )
-				defaultTextIconGap = scale( defaultTextIconGap );
-		};
+		renderer = createRenderer();
 	}
 
 	@Override
-	protected void paintText( Graphics g, JMenuItem menuItem, Rectangle textRect, String text ) {
-		paintText( g, menuItem, textRect, text, disabledForeground, selectionForeground );
+	protected void uninstallDefaults() {
+		super.uninstallDefaults();
+
+		renderer = null;
 	}
 
-	public static void paintText( Graphics g, JMenuItem menuItem, Rectangle textRect,
-		String text, Color disabledForeground, Color selectionForeground )
-	{
-		FontMetrics fm = menuItem.getFontMetrics( menuItem.getFont() );
-		int mnemonicIndex = FlatLaf.isShowMnemonics() ? menuItem.getDisplayedMnemonicIndex() : -1;
+	protected FlatMenuItemRenderer createRenderer() {
+		return new FlatMenuItemRenderer( menuItem, checkIcon, arrowIcon, acceleratorFont, acceleratorDelimiter );
+	}
 
-		ButtonModel model = menuItem.getModel();
-		g.setColor( !model.isEnabled()
-			? disabledForeground
-			: (model.isArmed() || (menuItem instanceof JMenu && model.isSelected())
-				? selectionForeground
-				: menuItem.getForeground()) );
+	@Override
+	protected Dimension getPreferredMenuItemSize( JComponent c, Icon checkIcon, Icon arrowIcon, int defaultTextIconGap ) {
+		return renderer.getPreferredMenuItemSize();
+	}
 
-		FlatUIUtils.drawStringUnderlineCharAt( menuItem, g, text, mnemonicIndex,
-			textRect.x, textRect.y + fm.getAscent() );
+	@Override
+	public void paint( Graphics g, JComponent c ) {
+		renderer.paintMenuItem( g, selectionBackground, selectionForeground, disabledForeground,
+			acceleratorForeground, acceleratorSelectionForeground );
 	}
 }

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

@@ -16,16 +16,17 @@
 
 package com.formdev.flatlaf.ui;
 
-import static com.formdev.flatlaf.util.UIScale.scale;
 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 javax.swing.ButtonModel;
+import javax.swing.Icon;
 import javax.swing.JComponent;
 import javax.swing.JMenu;
 import javax.swing.JMenuItem;
+import javax.swing.LookAndFeel;
 import javax.swing.UIManager;
 import javax.swing.event.MouseInputListener;
 import javax.swing.plaf.ComponentUI;
@@ -36,30 +37,36 @@ import javax.swing.plaf.basic.BasicMenuUI;
  *
  * <!-- BasicMenuUI -->
  *
- * @uiDefault Menu.font								Font
- * @uiDefault Menu.background						Color
- * @uiDefault Menu.foreground						Color
- * @uiDefault Menu.disabledForeground				Color
- * @uiDefault Menu.selectionBackground				Color
- * @uiDefault Menu.selectionForeground				Color
- * @uiDefault Menu.acceleratorForeground			Color
- * @uiDefault Menu.acceleratorSelectionForeground	Color
- * @uiDefault MenuItem.acceleratorFont				Font		defaults to MenuItem.font
- * @uiDefault MenuItem.acceleratorDelimiter			String
- * @uiDefault Menu.border							Border
- * @uiDefault Menu.borderPainted					boolean
- * @uiDefault Menu.margin							Insets
- * @uiDefault Menu.arrowIcon						Icon
- * @uiDefault Menu.checkIcon						Icon
- * @uiDefault Menu.opaque							boolean
- * @uiDefault Menu.evenHeight						boolean
- * @uiDefault Menu.crossMenuMnemonic				boolean	default is false
- * @uiDefault Menu.useMenuBarBackgroundForTopLevel	boolean	default is false
- * @uiDefault MenuBar.background					Color	used if Menu.useMenuBarBackgroundForTopLevel is true
+ * @uiDefault Menu.font												Font
+ * @uiDefault Menu.background										Color
+ * @uiDefault Menu.foreground										Color
+ * @uiDefault Menu.disabledForeground								Color
+ * @uiDefault Menu.selectionBackground								Color
+ * @uiDefault Menu.selectionForeground								Color
+ * @uiDefault Menu.acceleratorForeground							Color
+ * @uiDefault Menu.acceleratorSelectionForeground					Color
+ * @uiDefault MenuItem.acceleratorFont								Font		defaults to MenuItem.font
+ * @uiDefault MenuItem.acceleratorDelimiter							String
+ * @uiDefault Menu.border											Border
+ * @uiDefault Menu.borderPainted									boolean
+ * @uiDefault Menu.margin											Insets
+ * @uiDefault Menu.arrowIcon										Icon
+ * @uiDefault Menu.checkIcon										Icon
+ * @uiDefault Menu.opaque											boolean
+ * @uiDefault Menu.crossMenuMnemonic								boolean	default is false
+ * @uiDefault Menu.useMenuBarBackgroundForTopLevel					boolean	default is false
+ * @uiDefault MenuBar.background									Color	used if Menu.useMenuBarBackgroundForTopLevel is true
  *
  * <!-- FlatMenuUI -->
  *
- * @uiDefault MenuBar.hoverBackground				Color
+ * @uiDefault MenuItem.iconTextGap									int
+ * @uiDefault MenuBar.hoverBackground								Color
+ *
+ * <!-- FlatMenuRenderer -->
+ *
+ * @uiDefault MenuBar.underlineSelectionBackground					Color
+ * @uiDefault MenuBar.underlineSelectionColor						Color
+ * @uiDefault MenuBar.underlineSelectionHeight						int
  *
  * @author Karl Tauber
  */
@@ -67,6 +74,7 @@ public class FlatMenuUI
 	extends BasicMenuUI
 {
 	private Color hoverBackground;
+	private FlatMenuItemRenderer renderer;
 
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatMenuUI();
@@ -76,12 +84,12 @@ public class FlatMenuUI
 	protected void installDefaults() {
 		super.installDefaults();
 
+		LookAndFeel.installProperty( menuItem, "iconTextGap", FlatUIUtils.getUIInt( "MenuItem.iconTextGap", 4 ) );
+
 		menuItem.setRolloverEnabled( true );
 
 		hoverBackground = UIManager.getColor( "MenuBar.hoverBackground" );
-
-		// scale
-		defaultTextIconGap = scale( defaultTextIconGap );
+		renderer = createRenderer();
 	}
 
 	@Override
@@ -89,19 +97,11 @@ public class FlatMenuUI
 		super.uninstallDefaults();
 
 		hoverBackground = null;
+		renderer = null;
 	}
 
-	/**
-	 * Scale defaultTextIconGap again if iconTextGap property has changed.
-	 */
-	@Override
-	protected PropertyChangeListener createPropertyChangeListener( JComponent c ) {
-		PropertyChangeListener superListener = super.createPropertyChangeListener( c );
-		return e -> {
-			superListener.propertyChange( e );
-			if( e.getPropertyName() == "iconTextGap" )
-				defaultTextIconGap = scale( defaultTextIconGap );
-		};
+	protected FlatMenuItemRenderer createRenderer() {
+		return new FlatMenuRenderer( menuItem, checkIcon, arrowIcon, acceleratorFont, acceleratorDelimiter );
 	}
 
 	@Override
@@ -130,19 +130,62 @@ public class FlatMenuUI
 	}
 
 	@Override
-	protected void paintBackground( Graphics g, JMenuItem menuItem, Color bgColor ) {
-		ButtonModel model = menuItem.getModel();
-		if( model.isArmed() || model.isSelected() ) {
-			super.paintBackground( g, menuItem, bgColor );
-		} else if( model.isRollover() && model.isEnabled() && ((JMenu)menuItem).isTopLevelMenu() ) {
-			FlatUIUtils.setColor( g, hoverBackground, menuItem.getBackground() );
-			g.fillRect( 0, 0, menuItem.getWidth(), menuItem.getHeight() );
-		} else
-			super.paintBackground( g, menuItem, bgColor );
+	public Dimension getMinimumSize( JComponent c ) {
+		// avoid that top-level menus (in menu bar) are made smaller if horizontal space is rare
+		// same code is in BasicMenuUI since Java 10
+		// see https://bugs.openjdk.java.net/browse/JDK-8178430
+		return ((JMenu)menuItem).isTopLevelMenu() ? c.getPreferredSize() : null;
 	}
 
 	@Override
-	protected void paintText( Graphics g, JMenuItem menuItem, Rectangle textRect, String text ) {
-		FlatMenuItemUI.paintText( g, menuItem, textRect, text, disabledForeground, selectionForeground );
+	protected Dimension getPreferredMenuItemSize( JComponent c, Icon checkIcon, Icon arrowIcon, int defaultTextIconGap ) {
+		return renderer.getPreferredMenuItemSize();
+	}
+
+	@Override
+	public void paint( Graphics g, JComponent c ) {
+		renderer.paintMenuItem( g, selectionBackground, selectionForeground, disabledForeground,
+			acceleratorForeground, acceleratorSelectionForeground );
+	}
+
+	//---- class FlatMenuRenderer ---------------------------------------------
+
+	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 FlatMenuRenderer( JMenuItem menuItem, Icon checkIcon, Icon arrowIcon,
+			Font acceleratorFont, String acceleratorDelimiter )
+		{
+			super( menuItem, checkIcon, arrowIcon, acceleratorFont, acceleratorDelimiter );
+		}
+
+		@Override
+		protected void paintBackground( Graphics g, Color selectionBackground ) {
+			if( isUnderlineSelection() && ((JMenu)menuItem).isTopLevelMenu() )
+				selectionBackground = menuBarUnderlineSelectionBackground;
+
+			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 );
+		}
+
+		@Override
+		protected void paintUnderlineSelection( Graphics g, Color underlineSelectionColor, int underlineSelectionHeight ) {
+			if( ((JMenu)menuItem).isTopLevelMenu() ) {
+				underlineSelectionColor = menuBarUnderlineSelectionColor;
+				underlineSelectionHeight = menuBarUnderlineSelectionHeight;
+			}
+
+			super.paintUnderlineSelection( g, underlineSelectionColor, underlineSelectionHeight );
+		}
 	}
 }

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

@@ -35,11 +35,7 @@ import javax.swing.plaf.basic.BasicPanelUI;
 public class FlatPanelUI
 	extends BasicPanelUI
 {
-	private static ComponentUI instance;
-
 	public static ComponentUI createUI( JComponent c ) {
-		if( instance == null )
-			instance = new FlatPanelUI();
-		return instance;
+		return FlatUIUtils.createSharedUI( FlatPanelUI.class, FlatPanelUI::new );
 	}
 }

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

@@ -16,10 +16,10 @@
 
 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.Toolkit;
 import java.awt.event.FocusListener;
 import java.awt.event.KeyAdapter;
@@ -34,7 +34,7 @@ import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicPasswordFieldUI;
 import javax.swing.text.Caret;
 import javax.swing.text.JTextComponent;
-import com.formdev.flatlaf.FlatClientProperties;
+import com.formdev.flatlaf.util.HiDPIUtils;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JPasswordField}.
@@ -57,24 +57,23 @@ import com.formdev.flatlaf.FlatClientProperties;
  *
  * <!-- FlatPasswordFieldUI -->
  *
- * @uiDefault TextComponent.arc						int
- * @uiDefault Component.focusWidth					int
  * @uiDefault Component.minimumWidth				int
  * @uiDefault Component.isIntelliJTheme				boolean
  * @uiDefault PasswordField.placeholderForeground	Color
+ * @uiDefault PasswordField.showCapsLock			boolean
  * @uiDefault PasswordField.capsLockIcon			Icon
  * @uiDefault TextComponent.selectAllOnFocusPolicy	String	never, once (default) or always
+ * @uiDefault TextComponent.selectAllOnMouseClick	boolean
  *
  * @author Karl Tauber
  */
 public class FlatPasswordFieldUI
 	extends BasicPasswordFieldUI
 {
-	protected int arc;
-	protected int focusWidth;
 	protected int minimumWidth;
 	protected boolean isIntelliJTheme;
 	protected Color placeholderForeground;
+	protected boolean showCapsLock;
 	protected Icon capsLockIcon;
 
 	private FocusListener focusListener;
@@ -89,16 +88,15 @@ public class FlatPasswordFieldUI
 		super.installDefaults();
 
 		String prefix = getPropertyPrefix();
-		arc = UIManager.getInt( "TextComponent.arc" );
-		focusWidth = UIManager.getInt( "Component.focusWidth" );
 		minimumWidth = UIManager.getInt( "Component.minimumWidth" );
 		isIntelliJTheme = UIManager.getBoolean( "Component.isIntelliJTheme" );
 		placeholderForeground = UIManager.getColor( prefix + ".placeholderForeground" );
+		showCapsLock = UIManager.getBoolean( "PasswordField.showCapsLock" );
 		capsLockIcon = UIManager.getIcon( "PasswordField.capsLockIcon" );
 
-		LookAndFeel.installProperty( getComponent(), "opaque", focusWidth == 0 );
+		LookAndFeel.installProperty( getComponent(), "opaque", false );
 
-		MigLayoutVisualPadding.install( getComponent(), focusWidth );
+		MigLayoutVisualPadding.install( getComponent() );
 	}
 
 	@Override
@@ -147,28 +145,31 @@ public class FlatPasswordFieldUI
 
 	@Override
 	protected Caret createCaret() {
-		return new FlatCaret( UIManager.getString( "TextComponent.selectAllOnFocusPolicy" ) );
+		return new FlatCaret( UIManager.getString( "TextComponent.selectAllOnFocusPolicy" ),
+			UIManager.getBoolean( "TextComponent.selectAllOnMouseClick" ) );
 	}
 
 	@Override
 	protected void propertyChange( PropertyChangeEvent e ) {
 		super.propertyChange( e );
-
-		if( FlatClientProperties.PLACEHOLDER_TEXT.equals( e.getPropertyName() ) )
-			getComponent().repaint();
+		FlatTextFieldUI.propertyChange( getComponent(), e );
 	}
 
 	@Override
 	protected void paintSafely( Graphics g ) {
-		FlatTextFieldUI.paintBackground( g, getComponent(), focusWidth, arc, isIntelliJTheme );
+		FlatTextFieldUI.paintBackground( g, getComponent(), isIntelliJTheme );
 		FlatTextFieldUI.paintPlaceholder( g, getComponent(), placeholderForeground );
 		paintCapsLock( g );
-		super.paintSafely( g );
+
+		super.paintSafely( HiDPIUtils.createGraphicsTextYCorrection( (Graphics2D) g ) );
 	}
 
 	protected void paintCapsLock( Graphics g ) {
+		if( !showCapsLock )
+			return;
+
 		JTextComponent c = getComponent();
-		if( !c.isFocusOwner() ||
+		if( !FlatUIUtils.isPermanentFocusOwner( c ) ||
 			!Toolkit.getDefaultToolkit().getLockingKeyState( KeyEvent.VK_CAPS_LOCK ) )
 		  return;
 
@@ -184,18 +185,11 @@ public class FlatPasswordFieldUI
 
 	@Override
 	public Dimension getPreferredSize( JComponent c ) {
-		return applyMinimumWidth( super.getPreferredSize( c ), c );
+		return FlatTextFieldUI.applyMinimumWidth( c, super.getPreferredSize( c ), minimumWidth );
 	}
 
 	@Override
 	public Dimension getMinimumSize( JComponent c ) {
-		return applyMinimumWidth( super.getMinimumSize( c ), c );
-	}
-
-	private Dimension applyMinimumWidth( Dimension size, JComponent c ) {
-		int minimumWidth = FlatUIUtils.minimumWidth( getComponent(), this.minimumWidth );
-		int focusWidth = (c.getBorder() instanceof FlatBorder) ? this.focusWidth : 0;
-		size.width = Math.max( size.width, scale( minimumWidth + (focusWidth * 2) ) );
-		return size;
+		return FlatTextFieldUI.applyMinimumWidth( c, super.getMinimumSize( c ), minimumWidth );
 	}
 }

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

@@ -0,0 +1,507 @@
+/*
+ * Copyright 2020 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.Color;
+import java.awt.Component;
+import java.awt.Container;
+import java.awt.Dimension;
+import java.awt.Insets;
+import java.awt.MouseInfo;
+import java.awt.Panel;
+import java.awt.Point;
+import java.awt.Rectangle;
+import java.awt.Window;
+import java.awt.event.ComponentEvent;
+import java.awt.event.ComponentListener;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import javax.swing.JComponent;
+import javax.swing.JLayeredPane;
+import javax.swing.JPanel;
+import javax.swing.JToolTip;
+import javax.swing.JWindow;
+import javax.swing.Popup;
+import javax.swing.PopupFactory;
+import javax.swing.RootPaneContainer;
+import javax.swing.SwingUtilities;
+import javax.swing.UIManager;
+import javax.swing.border.Border;
+import com.formdev.flatlaf.FlatClientProperties;
+import com.formdev.flatlaf.util.SystemInfo;
+import com.formdev.flatlaf.util.UIScale;
+
+/**
+ * A popup factory that adds drop shadows to popups on Windows.
+ * On macOS and Linux, heavy weight popups (without drop shadow) are produced and the
+ * operating system automatically adds drop shadows.
+ *
+ * @author Karl Tauber
+ */
+public class FlatPopupFactory
+	extends PopupFactory
+{
+	private Method java8getPopupMethod;
+	private Method java9getPopupMethod;
+
+	@Override
+	public Popup getPopup( Component owner, Component contents, int x, int y )
+		throws IllegalArgumentException
+	{
+		Point pt = fixToolTipLocation( owner, contents, x, y );
+		if( pt != null ) {
+			x = pt.x;
+			y = pt.y;
+		}
+
+		boolean forceHeavyWeight = isOptionEnabled( owner, contents, FlatClientProperties.POPUP_FORCE_HEAVY_WEIGHT, "Popup.forceHeavyWeight" );
+
+		if( !isOptionEnabled( owner, contents, FlatClientProperties.POPUP_DROP_SHADOW_PAINTED, "Popup.dropShadowPainted" ) )
+			return new NonFlashingPopup( getPopupForScreenOfOwner( owner, contents, x, y, forceHeavyWeight ), contents );
+
+		// macOS and Linux adds drop shadow to heavy weight popups
+		if( SystemInfo.isMacOS || SystemInfo.isLinux )
+			return new NonFlashingPopup( getPopupForScreenOfOwner( owner, contents, x, y, true ), contents );
+
+		// create drop shadow popup
+		return new DropShadowPopup( getPopupForScreenOfOwner( owner, contents, x, y, forceHeavyWeight ), owner, contents );
+	}
+
+	/**
+	 * Creates a popup for the screen that the owner component is on.
+	 * <p>
+	 * PopupFactory caches heavy weight popup windows and reuses them.
+	 * On a dual screen setup, if the popup owner has moved from one screen to the other one,
+	 * then the cached heavy weight popup window may be connected to the wrong screen.
+	 * If the two screens use different scaling factors, then the popup location and size
+	 * is scaled when the popup becomes visible, which shows the popup in the wrong location
+	 * (or on wrong screen). The re-scaling is done in WWindowPeer.setBounds() (Java 9+).
+	 * <p>
+	 * To fix this, dispose popup windows that are on wrong screen and get new popup.
+	 * <p>
+	 * This is a workaround for https://bugs.openjdk.java.net/browse/JDK-8224608
+	 */
+	private Popup getPopupForScreenOfOwner( Component owner, Component contents, int x, int y, boolean forceHeavyWeight )
+		throws IllegalArgumentException
+	{
+		int count = 0;
+
+		for(;;) {
+			// create new or get cached popup
+			Popup popup = forceHeavyWeight
+				? getHeavyWeightPopup( owner, contents, x, y )
+				: super.getPopup( owner, contents, x, y );
+
+			// get heavy weight popup window; is null for non-heavy weight popup
+			Window popupWindow = SwingUtilities.windowForComponent( contents );
+
+			// check whether heavy weight popup window is on same screen as owner component
+			if( popupWindow == null ||
+				popupWindow.getGraphicsConfiguration() == owner.getGraphicsConfiguration() )
+			  return popup;
+
+			// remove contents component from popup window
+			if( popupWindow instanceof JWindow )
+				((JWindow)popupWindow).getContentPane().removeAll();
+
+			// 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;
+		}
+	}
+
+	/**
+	 * Shows the given popup and, if necessary, fixes the location of a heavy weight popup window.
+	 * <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.
+	 * <p>
+	 * This is a workaround for https://bugs.openjdk.java.net/browse/JDK-8224608
+	 */
+	private static void showPopupAndFixLocation( Popup popup, Window popupWindow ) {
+		if( popupWindow != null ) {
+			// remember location of heavy weight popup window
+			int x = popupWindow.getX();
+			int y = popupWindow.getY();
+
+			popup.show();
+
+			// restore popup window location if it has changed
+			// (probably scaled when screens use different scale factors)
+			if( popupWindow.getX() != x || popupWindow.getY() != y )
+				popupWindow.setLocation( x, y );
+		} else
+			popup.show();
+	}
+
+	private boolean isOptionEnabled( Component owner, Component contents, String clientKey, String uiKey ) {
+		if( owner instanceof JComponent ) {
+			Boolean b = FlatClientProperties.clientPropertyBooleanStrict( (JComponent) owner, clientKey, null );
+			if( b != null )
+				return b;
+		}
+
+		if( contents instanceof JComponent ) {
+			Boolean b = FlatClientProperties.clientPropertyBooleanStrict( (JComponent) contents, clientKey, null );
+			if( b != null )
+				return b;
+		}
+
+		return UIManager.getBoolean( uiKey );
+	}
+
+	/**
+	 * There is no API in Java 8 to force creation of heavy weight popups,
+	 * but it is possible with reflection. Java 9 provides a new method.
+	 *
+	 * When changing FlatLaf system requirements to Java 9+,
+	 * then this method can be replaced with:
+	 *    return getPopup( owner, contents, x, y, true );
+	 */
+	private Popup getHeavyWeightPopup( Component owner, Component contents, int x, int y )
+		throws IllegalArgumentException
+	{
+		try {
+			if( SystemInfo.isJava_9_orLater ) {
+				if( java9getPopupMethod == null ) {
+					java9getPopupMethod = PopupFactory.class.getDeclaredMethod(
+						"getPopup", Component.class, Component.class, int.class, int.class, boolean.class );
+				}
+				return (Popup) java9getPopupMethod.invoke( this, owner, contents, x, y, true );
+			} else {
+				// Java 8
+				if( java8getPopupMethod == null ) {
+					java8getPopupMethod = PopupFactory.class.getDeclaredMethod(
+						"getPopup", Component.class, Component.class, int.class, int.class, int.class );
+					java8getPopupMethod.setAccessible( true );
+				}
+				return (Popup) java8getPopupMethod.invoke( this, owner, contents, x, y, /*HEAVY_WEIGHT_POPUP*/ 2 );
+			}
+		} catch( NoSuchMethodException | SecurityException | IllegalAccessException | InvocationTargetException ex ) {
+			// ignore
+			return null;
+		}
+	}
+
+	/**
+	 * 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.
+	 * 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 owner, Component contents, int x, int y ) {
+		if( !(contents instanceof JToolTip) || !wasInvokedFromToolTipManager() )
+			return null;
+
+		Point mouseLocation = MouseInfo.getPointerInfo().getLocation();
+		Dimension tipSize = contents.getPreferredSize();
+
+		// check whether mouse location is within tooltip bounds
+		Rectangle tipBounds = new Rectangle( x, y, tipSize.width, tipSize.height );
+		if( !tipBounds.contains( mouseLocation ) )
+			return null;
+
+		// place tooltip above mouse location
+		return new Point( x, mouseLocation.y - tipSize.height - UIScale.scale( 20 ) );
+	}
+
+	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 false;
+	}
+
+	//---- class NonFlashingPopup ---------------------------------------------
+
+	private class NonFlashingPopup
+		extends Popup
+	{
+		private Popup delegate;
+		private Component contents;
+
+		// heavy weight
+		protected Window popupWindow;
+		private Color oldPopupWindowBackground;
+
+		NonFlashingPopup( Popup delegate, Component contents ) {
+			this.delegate = delegate;
+			this.contents = contents;
+
+			popupWindow = SwingUtilities.windowForComponent( contents );
+			if( popupWindow != null ) {
+				// heavy weight popup
+
+				// fix background flashing which may occur on some platforms
+				// (e.g. macOS and Linux) when using dark theme
+				oldPopupWindowBackground = popupWindow.getBackground();
+				popupWindow.setBackground( contents.getBackground() );
+			}
+		}
+
+		@Override
+		public void show() {
+			if( delegate != null ) {
+				showPopupAndFixLocation( delegate, popupWindow );
+
+				// increase tooltip size if necessary because it may be too small on HiDPI screens
+				//    https://bugs.openjdk.java.net/browse/JDK-8213535
+				if( contents instanceof JToolTip && popupWindow == null ) {
+					Container parent = contents.getParent();
+					if( parent instanceof JPanel ) {
+						Dimension prefSize = parent.getPreferredSize();
+						if( !prefSize.equals( parent.getSize() ) ) {
+							Container mediumWeightPanel = SwingUtilities.getAncestorOfClass( Panel.class, parent );
+							Container c = (mediumWeightPanel != null)
+								? mediumWeightPanel // medium weight popup
+								: parent;           // light weight popup
+							c.setSize( prefSize );
+							c.validate();
+						}
+					}
+				}
+			}
+		}
+
+		@Override
+		public void hide() {
+			if( delegate != null ) {
+				delegate.hide();
+				delegate = null;
+				contents = null;
+			}
+
+			if( popupWindow != null ) {
+				// restore background so that it can not affect other LaFs (when switching)
+				// because popup windows are cached and reused
+				popupWindow.setBackground( oldPopupWindowBackground );
+				popupWindow = null;
+			}
+		}
+	}
+
+	//---- class DropShadowPopup ----------------------------------------------
+
+	private class DropShadowPopup
+		extends NonFlashingPopup
+	{
+		private final Component owner;
+
+		// light weight
+		private JComponent lightComp;
+		private Border oldBorder;
+		private boolean oldOpaque;
+
+		// medium weight
+		private boolean mediumWeightShown;
+		private Panel mediumWeightPanel;
+		private JPanel dropShadowPanel;
+		private ComponentListener mediumPanelListener;
+
+		// heavy weight
+		private Popup dropShadowDelegate;
+		private Window dropShadowWindow;
+		private Color oldDropShadowWindowBackground;
+
+		DropShadowPopup( Popup delegate, Component owner, Component contents ) {
+			super( delegate, contents );
+			this.owner = owner;
+
+			Dimension size = contents.getPreferredSize();
+			if( size.width <= 0 || size.height <= 0 )
+				return;
+
+			if( popupWindow != null ) {
+				// heavy weight popup
+
+				// Since Java has a problem with sub-pixel text rendering on translucent
+				// windows, we can not make the popup window translucent for the drop shadow.
+				// (see https://bugs.openjdk.java.net/browse/JDK-8215980)
+				// The solution is to create a second translucent window that paints
+				// the drop shadow and is positioned behind the popup window.
+
+				// create panel that paints the drop shadow
+				JPanel dropShadowPanel = new JPanel();
+				dropShadowPanel.setBorder( createDropShadowBorder() );
+				dropShadowPanel.setOpaque( false );
+
+				// set preferred size of drop shadow panel
+				Dimension prefSize = popupWindow.getPreferredSize();
+				Insets insets = dropShadowPanel.getInsets();
+				dropShadowPanel.setPreferredSize( new Dimension(
+					prefSize.width + insets.left + insets.right,
+					prefSize.height + insets.top + insets.bottom ) );
+
+				// create heavy weight popup for drop shadow
+				int x = popupWindow.getX() - insets.left;
+				int y = popupWindow.getY() - insets.top;
+				dropShadowDelegate = getPopupForScreenOfOwner( owner, dropShadowPanel, x, y, true );
+
+				// make drop shadow popup window translucent
+				dropShadowWindow = SwingUtilities.windowForComponent( dropShadowPanel );
+				if( dropShadowWindow != null ) {
+					oldDropShadowWindowBackground = dropShadowWindow.getBackground();
+					dropShadowWindow.setBackground( new Color( 0, true ) );
+				}
+			} else {
+				mediumWeightPanel = (Panel) SwingUtilities.getAncestorOfClass( Panel.class, contents );
+				if( mediumWeightPanel != null ) {
+					// medium weight popup
+					dropShadowPanel = new JPanel();
+					dropShadowPanel.setBorder( createDropShadowBorder() );
+					dropShadowPanel.setOpaque( false );
+					dropShadowPanel.setSize( FlatUIUtils.addInsets( mediumWeightPanel.getSize(), dropShadowPanel.getInsets() ) );
+				} else {
+					// light weight popup
+					Container p = contents.getParent();
+					if( !(p instanceof JComponent) )
+						return;
+
+					lightComp = (JComponent) p;
+					oldBorder = lightComp.getBorder();
+					oldOpaque = lightComp.isOpaque();
+					lightComp.setBorder( createDropShadowBorder() );
+					lightComp.setOpaque( false );
+					lightComp.setSize( lightComp.getPreferredSize() );
+				}
+			}
+		}
+
+		private Border createDropShadowBorder() {
+			return new FlatDropShadowBorder(
+				UIManager.getColor( "Popup.dropShadowColor" ),
+				UIManager.getInsets( "Popup.dropShadowInsets" ),
+				FlatUIUtils.getUIFloat( "Popup.dropShadowOpacity", 0.5f ) );
+		}
+
+		@Override
+		public void show() {
+			if( dropShadowDelegate != null )
+				showPopupAndFixLocation( dropShadowDelegate, dropShadowWindow );
+
+			if( mediumWeightPanel != null )
+				showMediumWeightDropShadow();
+
+			super.show();
+
+			// fix location of light weight popup in case it has left or top drop shadow
+			if( lightComp != null ) {
+				Insets insets = lightComp.getInsets();
+				if( insets.left != 0 || insets.top != 0 )
+					lightComp.setLocation( lightComp.getX() - insets.left, lightComp.getY() - insets.top );
+			}
+		}
+
+		@Override
+		public void hide() {
+			if( dropShadowDelegate != null ) {
+				dropShadowDelegate.hide();
+				dropShadowDelegate = null;
+			}
+
+			if( mediumWeightPanel != null ) {
+				hideMediumWeightDropShadow();
+				dropShadowPanel = null;
+				mediumWeightPanel = null;
+			}
+
+			super.hide();
+
+			if( dropShadowWindow != null ) {
+				dropShadowWindow.setBackground( oldDropShadowWindowBackground );
+				dropShadowWindow = null;
+			}
+
+			if( lightComp != null ) {
+				lightComp.setBorder( oldBorder );
+				lightComp.setOpaque( oldOpaque );
+				lightComp = null;
+			}
+		}
+
+		private void showMediumWeightDropShadow() {
+			if( mediumWeightShown )
+				return;
+
+			mediumWeightShown = true;
+
+			Window window = SwingUtilities.windowForComponent( owner );
+			if( window == null )
+				return;
+
+			if( !(window instanceof RootPaneContainer) )
+				return;
+
+			dropShadowPanel.setVisible( false );
+
+			JLayeredPane layeredPane = ((RootPaneContainer)window).getLayeredPane();
+			layeredPane.add( dropShadowPanel, JLayeredPane.POPUP_LAYER, 0 );
+
+			mediumPanelListener = new ComponentListener() {
+				@Override
+				public void componentShown( ComponentEvent e ) {
+					if( dropShadowPanel != null )
+						dropShadowPanel.setVisible( true );
+				}
+
+				@Override
+				public void componentHidden( ComponentEvent e ) {
+					if( dropShadowPanel != null )
+						dropShadowPanel.setVisible( false );
+				}
+
+				@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 );
+					}
+				}
+
+				@Override
+				public void componentResized( ComponentEvent e ) {
+					if( dropShadowPanel != null )
+						dropShadowPanel.setSize( FlatUIUtils.addInsets( mediumWeightPanel.getSize(), dropShadowPanel.getInsets() ) );
+				}
+			};
+			mediumWeightPanel.addComponentListener( mediumPanelListener );
+		}
+
+		private void hideMediumWeightDropShadow() {
+			mediumWeightPanel.removeComponentListener( mediumPanelListener );
+
+			Container parent = dropShadowPanel.getParent();
+			if( parent != null ) {
+				Rectangle bounds = dropShadowPanel.getBounds();
+				parent.remove( dropShadowPanel );
+				parent.repaint( bounds.x, bounds.y, bounds.width, bounds.height );
+			}
+		}
+	}
+}

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

@@ -38,12 +38,8 @@ import javax.swing.plaf.ComponentUI;
 public class FlatPopupMenuSeparatorUI
 	extends FlatSeparatorUI
 {
-	private static ComponentUI instance;
-
 	public static ComponentUI createUI( JComponent c ) {
-		if( instance == null )
-			instance = new FlatPopupMenuSeparatorUI();
-		return instance;
+		return FlatUIUtils.createSharedUI( FlatPopupMenuSeparatorUI.class, FlatPopupMenuSeparatorUI::new );
 	}
 
 	@Override

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

@@ -31,6 +31,7 @@ import javax.swing.LookAndFeel;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicProgressBarUI;
+import com.formdev.flatlaf.util.HiDPIUtils;
 import com.formdev.flatlaf.util.UIScale;
 
 /**
@@ -154,7 +155,7 @@ public class FlatProgressBarUI
 			? 0
 			: Math.min( UIScale.scale( this.arc ), horizontal ? height : width );
 
-		FlatUIUtils.setRenderingHints( (Graphics2D) g );
+		Object[] oldRenderingHints = FlatUIUtils.setRenderingHints( g );
 
 		// paint track
 		RoundRectangle2D.Float trackShape = new RoundRectangle2D.Float( x, y, width, height, arc, arc );
@@ -162,6 +163,7 @@ public class FlatProgressBarUI
 		((Graphics2D)g).fill( trackShape );
 
 		// paint progress
+		int amountFull = 0;
 		if( progressBar.isIndeterminate() ) {
 			boxRect = getBox( boxRect );
 			if( boxRect != null ) {
@@ -169,11 +171,8 @@ public class FlatProgressBarUI
 				((Graphics2D)g).fill( new RoundRectangle2D.Float( boxRect.x, boxRect.y,
 					boxRect.width, boxRect.height, arc, arc ) );
 			}
-
-			if( progressBar.isStringPainted() )
-				paintString( g, x, y, width, height, 0, insets );
 		} else {
-			int amountFull = getAmountFull( insets, width, height );
+			amountFull = getAmountFull( insets, width, height );
 
 			RoundRectangle2D.Float progressShape = horizontal
 				? new RoundRectangle2D.Float( c.getComponentOrientation().isLeftToRight() ? x : x + (width - amountFull),
@@ -188,10 +187,17 @@ public class FlatProgressBarUI
 				((Graphics2D)g).fill( area );
 			} else
 				((Graphics2D)g).fill( progressShape );
-
-			if( progressBar.isStringPainted() )
-				paintString( g, x, y, width, height, amountFull, insets );
 		}
+
+		FlatUIUtils.resetRenderingHints( g, oldRenderingHints );
+
+		if( progressBar.isStringPainted() )
+			paintString( g, x, y, width, height, amountFull, insets );
+	}
+
+	@Override
+	protected void paintString( Graphics g, int x, int y, int width, int height, int amountFull, Insets b ) {
+		super.paintString( HiDPIUtils.createGraphicsTextYCorrection( (Graphics2D) g ), x, y, width, height, amountFull, b );
 	}
 
 	@Override

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

@@ -16,12 +16,11 @@
 
 package com.formdev.flatlaf.ui;
 
-import static com.formdev.flatlaf.util.UIScale.scale;
+import java.awt.Dimension;
 import java.awt.Graphics;
-import java.awt.Rectangle;
-import java.beans.PropertyChangeListener;
+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.BasicRadioButtonMenuItemUI;
 
@@ -46,13 +45,18 @@ import javax.swing.plaf.basic.BasicRadioButtonMenuItemUI;
  * @uiDefault RadioButtonMenuItem.arrowIcon							Icon
  * @uiDefault RadioButtonMenuItem.checkIcon							Icon
  * @uiDefault RadioButtonMenuItem.opaque							boolean
- * @uiDefault RadioButtonMenuItem.evenHeight						boolean
+ *
+ * <!-- FlatRadioButtonMenuItemUI -->
+ *
+ * @uiDefault MenuItem.iconTextGap									int
  *
  * @author Karl Tauber
  */
 public class FlatRadioButtonMenuItemUI
 	extends BasicRadioButtonMenuItemUI
 {
+	private FlatMenuItemRenderer renderer;
+
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatRadioButtonMenuItemUI();
 	}
@@ -61,25 +65,30 @@ public class FlatRadioButtonMenuItemUI
 	protected void installDefaults() {
 		super.installDefaults();
 
-		// scale
-		defaultTextIconGap = scale( defaultTextIconGap );
-	}
+		LookAndFeel.installProperty( menuItem, "iconTextGap", FlatUIUtils.getUIInt( "MenuItem.iconTextGap", 4 ) );
 
-	/**
-	 * Scale defaultTextIconGap again if iconTextGap property has changed.
-	 */
-	@Override
-	protected PropertyChangeListener createPropertyChangeListener( JComponent c ) {
-		PropertyChangeListener superListener = super.createPropertyChangeListener( c );
-		return e -> {
-			superListener.propertyChange( e );
-			if( e.getPropertyName() == "iconTextGap" )
-				defaultTextIconGap = scale( defaultTextIconGap );
-		};
+		renderer = createRenderer();
 	}
 
 	@Override
-	protected void paintText( Graphics g, JMenuItem menuItem, Rectangle textRect, String text ) {
-		FlatMenuItemUI.paintText( g, menuItem, textRect, text, disabledForeground, selectionForeground );
+	protected void uninstallDefaults() {
+		super.uninstallDefaults();
+
+		renderer = null;
+	}
+
+	protected FlatMenuItemRenderer createRenderer() {
+		return new FlatMenuItemRenderer( menuItem, checkIcon, arrowIcon, acceleratorFont, acceleratorDelimiter );
+	}
+
+	@Override
+	protected Dimension getPreferredMenuItemSize( JComponent c, Icon checkIcon, Icon arrowIcon, int defaultTextIconGap ) {
+		return renderer.getPreferredMenuItemSize();
+	}
+
+	@Override
+	public void paint( Graphics g, JComponent c ) {
+		renderer.paintMenuItem( g, selectionBackground, selectionForeground, disabledForeground,
+			acceleratorForeground, acceleratorSelectionForeground );
 	}
 }

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

@@ -23,7 +23,6 @@ import java.awt.Graphics;
 import java.awt.Insets;
 import java.awt.Rectangle;
 import javax.swing.AbstractButton;
-import javax.swing.CellRendererPane;
 import javax.swing.JComponent;
 import javax.swing.LookAndFeel;
 import javax.swing.UIManager;
@@ -61,12 +60,8 @@ public class FlatRadioButtonUI
 
 	private boolean defaults_initialized = false;
 
-	private static ComponentUI instance;
-
 	public static ComponentUI createUI( JComponent c ) {
-		if( instance == null )
-			instance = new FlatRadioButtonUI();
-		return instance;
+		return FlatUIUtils.createSharedUI( FlatRadioButtonUI.class, FlatRadioButtonUI::new );
 	}
 
 	@Override
@@ -122,11 +117,10 @@ public class FlatRadioButtonUI
 	public void paint( Graphics g, JComponent c ) {
 		// fill background even if not opaque if
 		// - contentAreaFilled is true and
-		//   - used as cell renderer (because of selection background)
-		//   - or if background was explicitly set to a non-UIResource color
+		// - if background was explicitly set to a non-UIResource color
 		if( !c.isOpaque() &&
 			((AbstractButton)c).isContentAreaFilled() &&
-			(c.getParent() instanceof CellRendererPane || !(c.getBackground() instanceof UIResource)))
+			!(c.getBackground() instanceof UIResource) )
 		{
 			g.setColor( c.getBackground() );
 			g.fillRect( 0, 0, c.getWidth(), c.getHeight() );
@@ -155,7 +149,7 @@ public class FlatRadioButtonUI
 			}
 		}
 
-		super.paint( g, c );
+		super.paint( FlatLabelUI.createGraphicsHTMLTextYCorrection( g, c ), c );
 	}
 
 	@Override

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

@@ -16,23 +16,412 @@
 
 package com.formdev.flatlaf.ui;
 
+import java.awt.Color;
+import java.awt.Component;
+import java.awt.Container;
+import java.awt.Dimension;
+import java.awt.Frame;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.Insets;
+import java.awt.LayoutManager;
+import java.awt.LayoutManager2;
+import java.awt.Window;
+import java.beans.PropertyChangeEvent;
+import java.util.function.Function;
 import javax.swing.JComponent;
+import javax.swing.JDialog;
+import javax.swing.JFrame;
+import javax.swing.JLayeredPane;
+import javax.swing.JMenuBar;
+import javax.swing.JRootPane;
+import javax.swing.LookAndFeel;
+import javax.swing.UIManager;
+import javax.swing.border.Border;
+import javax.swing.plaf.BorderUIResource;
 import javax.swing.plaf.ComponentUI;
+import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicRootPaneUI;
+import com.formdev.flatlaf.FlatClientProperties;
+import com.formdev.flatlaf.FlatLaf;
+import com.formdev.flatlaf.util.HiDPIUtils;
+import com.formdev.flatlaf.util.SystemInfo;
+import com.formdev.flatlaf.util.UIScale;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JRootPane}.
  *
+ * <!-- FlatRootPaneUI -->
+ *
+ * @uiDefault RootPane.border								Border
+ * @uiDefault RootPane.activeBorderColor					Color
+ * @uiDefault RootPane.inactiveBorderColor					Color
+ * @uiDefault TitlePane.borderColor							Color	optional
+ *
+ * <!-- FlatWindowResizer -->
+ *
+ * @uiDefault RootPane.borderDragThickness					int
+ * @uiDefault RootPane.cornerDragWidth						int
+ * @uiDefault RootPane.honorFrameMinimumSizeOnResize		boolean
+ * @uiDefault RootPane.honorDialogMinimumSizeOnResize		boolean
+ *
  * @author Karl Tauber
  */
 public class FlatRootPaneUI
 	extends BasicRootPaneUI
 {
-	private static ComponentUI instance;
+	// check this field before using class JBRCustomDecorations to avoid unnecessary loading of that class
+	static final boolean canUseJBRCustomDecorations
+		= SystemInfo.isJetBrainsJVM_11_orLater && SystemInfo.isWindows_10_orLater;
+
+	protected final Color borderColor = UIManager.getColor( "TitlePane.borderColor" );
+
+	protected JRootPane rootPane;
+	protected FlatTitlePane titlePane;
+	protected FlatWindowResizer windowResizer;
+
+	private LayoutManager oldLayout;
 
 	public static ComponentUI createUI( JComponent c ) {
-		if( instance == null )
-			instance = new FlatRootPaneUI();
-		return instance;
+		return new FlatRootPaneUI();
+	}
+
+	@Override
+	public void installUI( JComponent c ) {
+		super.installUI( c );
+
+		rootPane = (JRootPane) c;
+
+		if( rootPane.getWindowDecorationStyle() != JRootPane.NONE )
+			installClientDecorations();
+		else
+			installBorder();
+
+		if( canUseJBRCustomDecorations )
+			JBRCustomDecorations.install( rootPane );
+	}
+
+	protected void installBorder() {
+		if( borderColor != null ) {
+			Border b = rootPane.getBorder();
+			if( b == null || b instanceof UIResource )
+				rootPane.setBorder( new FlatWindowTitleBorder( borderColor ) );
+		}
+	}
+
+	@Override
+	public void uninstallUI( JComponent c ) {
+		super.uninstallUI( c );
+
+		uninstallClientDecorations();
+		rootPane = null;
+	}
+
+	@Override
+	protected void installDefaults( JRootPane c ) {
+		super.installDefaults( c );
+
+		// Update background color of JFrame or JDialog parent to avoid bad border
+		// on HiDPI screens when switching from light to dark Laf.
+		// 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.
+		Container parent = c.getParent();
+		if( parent instanceof JFrame || parent instanceof JDialog ) {
+			Color background = parent.getBackground();
+			if( background == null || background instanceof UIResource )
+				parent.setBackground( UIManager.getColor( "control" ) );
+		}
+
+		// enable dark window appearance on macOS when running in JetBrains Runtime
+		if( SystemInfo.isJetBrainsJVM && SystemInfo.isMacOS_10_14_Mojave_orLater )
+			c.putClientProperty( "jetbrains.awt.windowDarkAppearance", FlatLaf.isLafDark() );
+	}
+
+	protected void installClientDecorations() {
+		boolean isJBRSupported = canUseJBRCustomDecorations && JBRCustomDecorations.isSupported();
+
+		// install border
+		if( rootPane.getWindowDecorationStyle() != JRootPane.NONE && !isJBRSupported )
+			LookAndFeel.installBorder( rootPane, "RootPane.border" );
+		else
+			LookAndFeel.uninstallBorder( rootPane );
+
+		// install title pane
+		setTitlePane( createTitlePane() );
+
+		// install layout
+		oldLayout = rootPane.getLayout();
+		rootPane.setLayout( createRootLayout() );
+
+		// install window resizer
+		if( !isJBRSupported )
+			windowResizer = createWindowResizer();
+	}
+
+	protected void uninstallClientDecorations() {
+		LookAndFeel.uninstallBorder( rootPane );
+		setTitlePane( null );
+
+		if( windowResizer != null ) {
+			windowResizer.uninstall();
+			windowResizer = null;
+		}
+
+		if( oldLayout != null ) {
+			rootPane.setLayout( oldLayout );
+			oldLayout = null;
+		}
+
+		if( rootPane.getWindowDecorationStyle() == JRootPane.NONE ) {
+			rootPane.revalidate();
+			rootPane.repaint();
+		}
+	}
+
+	protected FlatRootLayout createRootLayout() {
+		return new FlatRootLayout();
+	}
+
+	protected FlatWindowResizer createWindowResizer() {
+		return new FlatWindowResizer.WindowResizer( rootPane );
+	}
+
+	protected FlatTitlePane createTitlePane() {
+		return new FlatTitlePane( rootPane );
+	}
+
+	// layer title pane under frame content layer to allow placing menu bar over title pane
+	protected final static Integer TITLE_PANE_LAYER = JLayeredPane.FRAME_CONTENT_LAYER - 1;
+
+	protected void setTitlePane( FlatTitlePane newTitlePane ) {
+		JLayeredPane layeredPane = rootPane.getLayeredPane();
+
+		if( titlePane != null )
+			layeredPane.remove( titlePane );
+
+		if( newTitlePane != null )
+			layeredPane.add( newTitlePane, TITLE_PANE_LAYER );
+
+		titlePane = newTitlePane;
+	}
+
+	@Override
+	public void propertyChange( PropertyChangeEvent e ) {
+		super.propertyChange( e );
+
+		switch( e.getPropertyName() ) {
+			case "windowDecorationStyle":
+				uninstallClientDecorations();
+				if( rootPane.getWindowDecorationStyle() != JRootPane.NONE )
+					installClientDecorations();
+				else
+					installBorder();
+				break;
+
+			case FlatClientProperties.MENU_BAR_EMBEDDED:
+				if( titlePane != null ) {
+					titlePane.menuBarChanged();
+					rootPane.revalidate();
+					rootPane.repaint();
+				}
+				break;
+		}
+	}
+
+	//---- class FlatRootLayout -----------------------------------------------
+
+	protected class FlatRootLayout
+		implements LayoutManager2
+	{
+		@Override public void addLayoutComponent( String name, Component comp ) {}
+		@Override public void addLayoutComponent( Component comp, Object constraints ) {}
+		@Override public void removeLayoutComponent( Component comp ) {}
+
+		@Override
+		public Dimension preferredLayoutSize( Container parent ) {
+			return computeLayoutSize( parent, c -> c.getPreferredSize() );
+		}
+
+		@Override
+		public Dimension minimumLayoutSize( Container parent ) {
+			return computeLayoutSize( parent, c -> c.getMinimumSize() );
+		}
+
+		@Override
+		public Dimension maximumLayoutSize( Container parent ) {
+			return new Dimension( Integer.MAX_VALUE, Integer.MAX_VALUE );
+		}
+
+		private Dimension computeLayoutSize( Container parent, Function<Component, Dimension> getSizeFunc ) {
+			JRootPane rootPane = (JRootPane) parent;
+
+			Dimension titlePaneSize = (titlePane != null)
+				? getSizeFunc.apply( titlePane )
+				: new Dimension();
+			Dimension contentSize = (rootPane.getContentPane() != null)
+				? getSizeFunc.apply( rootPane.getContentPane() )
+				: rootPane.getSize();
+
+			int width = Math.max( titlePaneSize.width, contentSize.width );
+			int height = titlePaneSize.height + contentSize.height;
+			if( titlePane == null || !titlePane.isMenuBarEmbedded() ) {
+				JMenuBar menuBar = rootPane.getJMenuBar();
+				Dimension menuBarSize = (menuBar != null && menuBar.isVisible())
+					? getSizeFunc.apply( menuBar )
+					: new Dimension();
+
+				width = Math.max( width, menuBarSize.width );
+				height += menuBarSize.height;
+			}
+
+			Insets insets = rootPane.getInsets();
+
+			return new Dimension(
+				width + insets.left + insets.right,
+				height + insets.top + insets.bottom );
+		}
+
+		@Override
+		public void layoutContainer( Container parent ) {
+			JRootPane rootPane = (JRootPane) parent;
+			boolean isFullScreen = FlatUIUtils.isFullScreen( rootPane );
+
+			Insets insets = rootPane.getInsets();
+			int x = insets.left;
+			int y = insets.top;
+			int width = rootPane.getWidth() - insets.left - insets.right;
+			int height = rootPane.getHeight() - insets.top - insets.bottom;
+
+			if( rootPane.getLayeredPane() != null )
+				rootPane.getLayeredPane().setBounds( x, y, width, height );
+			if( rootPane.getGlassPane() != null )
+				rootPane.getGlassPane().setBounds( x, y, width, height );
+
+			int nextY = 0;
+			if( !isFullScreen && titlePane != null ) {
+				Dimension prefSize = titlePane.getPreferredSize();
+				titlePane.setBounds( 0, 0, width, prefSize.height );
+				nextY += prefSize.height;
+			}
+
+			JMenuBar menuBar = rootPane.getJMenuBar();
+			if( menuBar != null && menuBar.isVisible() ) {
+				if( !isFullScreen && titlePane != null && titlePane.isMenuBarEmbedded() ) {
+					titlePane.validate();
+					menuBar.setBounds( titlePane.getMenuBarBounds() );
+				} else {
+					Dimension prefSize = menuBar.getPreferredSize();
+					menuBar.setBounds( 0, nextY, width, prefSize.height );
+					nextY += prefSize.height;
+				}
+			}
+
+			Container contentPane = rootPane.getContentPane();
+			if( contentPane != null )
+				contentPane.setBounds( 0, nextY, width, Math.max( height - nextY, 0 ) );
+
+			if( titlePane != null )
+				titlePane.menuBarLayouted();
+		}
+
+		@Override
+		public void invalidateLayout( Container parent ) {
+			if( titlePane != null )
+				titlePane.menuBarChanged();
+		}
+
+		@Override
+		public float getLayoutAlignmentX( Container target ) {
+			return 0;
+		}
+
+		@Override
+		public float getLayoutAlignmentY( Container target ) {
+			return 0;
+		}
+	}
+
+	//---- class FlatWindowBorder ---------------------------------------------
+
+	public static class FlatWindowBorder
+		extends BorderUIResource.EmptyBorderUIResource
+	{
+		protected final Color activeBorderColor = UIManager.getColor( "RootPane.activeBorderColor" );
+		protected final Color inactiveBorderColor = UIManager.getColor( "RootPane.inactiveBorderColor" );
+		protected final Color baseBorderColor = UIManager.getColor( "Panel.background" );
+
+		public FlatWindowBorder() {
+			super( 1, 1, 1, 1 );
+		}
+
+		@Override
+		public Insets getBorderInsets( Component c, Insets insets ) {
+			if( isWindowMaximized( c ) || FlatUIUtils.isFullScreen( c ) ) {
+				// hide border if window is maximized
+				insets.top = insets.left = insets.bottom = insets.right = 0;
+				return insets;
+			} else
+				return super.getBorderInsets( c, insets );
+		}
+
+		@Override
+		public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
+			if( isWindowMaximized( c ) || FlatUIUtils.isFullScreen( c ) )
+				return;
+
+			Container parent = c.getParent();
+			boolean active = parent instanceof Window ? ((Window)parent).isActive() : false;
+
+			g.setColor( FlatUIUtils.deriveColor( active ? activeBorderColor : inactiveBorderColor, baseBorderColor ) );
+			HiDPIUtils.paintAtScale1x( (Graphics2D) g, x, y, width, height, this::paintImpl );
+		}
+
+		private void paintImpl( Graphics2D g, int x, int y, int width, int height, double scaleFactor ) {
+			g.drawRect( x, y, width - 1, height - 1 );
+		}
+
+		protected boolean isWindowMaximized( Component c ) {
+			Container parent = c.getParent();
+			return parent instanceof Frame
+				? (((Frame)parent).getExtendedState() & Frame.MAXIMIZED_BOTH) != 0
+				: false;
+		}
+	}
+
+	//---- class FlatWindowTitleBorder ----------------------------------------
+
+	private static class FlatWindowTitleBorder
+		extends BorderUIResource.EmptyBorderUIResource
+	{
+		private final Color borderColor;
+
+		FlatWindowTitleBorder( Color borderColor ) {
+			super( 0, 0, 0, 0 );
+			this.borderColor = borderColor;
+		}
+
+		@Override
+		public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
+			if( showBorder( c ) ) {
+				float lineHeight = UIScale.scale( (float) 1 );
+				FlatUIUtils.paintFilledRectangle( g, borderColor, x, y, width, lineHeight );
+			}
+		}
+
+		@Override
+		public Insets getBorderInsets( Component c, Insets insets ) {
+			insets.set( showBorder( c ) ? 1 : 0, 0, 0, 0 );
+			return insets;
+		}
+
+		private boolean showBorder( Component c ) {
+			Container parent = c.getParent();
+			return
+				(parent instanceof JFrame &&
+				 (((JFrame)parent).getJMenuBar() == null ||
+				  !((JFrame)parent).getJMenuBar().isVisible())) ||
+				parent instanceof JDialog;
+		}
 	}
 }

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

@@ -16,7 +16,6 @@
 
 package com.formdev.flatlaf.ui;
 
-import static com.formdev.flatlaf.util.UIScale.scale;
 import java.awt.Component;
 import javax.swing.UIManager;
 
@@ -33,7 +32,11 @@ public class FlatRoundBorder
 	protected final int arc = UIManager.getInt( "Component.arc" );
 
 	@Override
-	protected float getArc( Component c ) {
-		return scale( (float) arc );
+	protected int getArc( Component c ) {
+		if( isCellEditor( c ) )
+			return 0;
+
+		Boolean roundRect = FlatUIUtils.isRoundRect( c );
+		return roundRect != null ? (roundRect ? Short.MAX_VALUE : 0) : arc;
 	}
 }

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

@@ -19,6 +19,7 @@ package com.formdev.flatlaf.ui;
 import java.awt.Color;
 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;
@@ -28,6 +29,7 @@ import java.util.Objects;
 import javax.swing.InputMap;
 import javax.swing.JButton;
 import javax.swing.JComponent;
+import javax.swing.JScrollBar;
 import javax.swing.JScrollPane;
 import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
@@ -52,29 +54,49 @@ import com.formdev.flatlaf.util.UIScale;
  *
  * <!-- FlatScrollBarUI -->
  *
- * @uiDefault ScrollBar.hoverTrackColor				Color
- * @uiDefault ScrollBar.hoverThumbColor				Color
- * @uiDefault Component.arrowType					String	triangle (default) or chevron
+ * @uiDefault ScrollBar.trackInsets					Insets
+ * @uiDefault ScrollBar.thumbInsets					Insets
+ * @uiDefault ScrollBar.trackArc					int
+ * @uiDefault ScrollBar.thumbArc					int
+ * @uiDefault ScrollBar.hoverTrackColor				Color	optional
+ * @uiDefault ScrollBar.hoverThumbColor				Color	optional
+ * @uiDefault ScrollBar.hoverThumbWithTrack			boolean
+ * @uiDefault ScrollBar.pressedTrackColor			Color	optional
+ * @uiDefault ScrollBar.pressedThumbColor			Color	optional
+ * @uiDefault ScrollBar.pressedThumbWithTrack		boolean
+ * @uiDefault Component.arrowType					String	chevron (default) or triangle
  * @uiDefault ScrollBar.showButtons					boolean
  * @uiDefault ScrollBar.buttonArrowColor			Color
  * @uiDefault ScrollBar.buttonDisabledArrowColor	Color
+ * @uiDefault ScrollBar.hoverButtonBackground		Color	optional
+ * @uiDefault ScrollBar.pressedButtonBackground		Color	optional
  *
  * @author Karl Tauber
  */
 public class FlatScrollBarUI
 	extends BasicScrollBarUI
 {
+	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;
 
 	protected boolean showButtons;
 	protected String arrowType;
 	protected Color buttonArrowColor;
 	protected Color buttonDisabledArrowColor;
+	protected Color hoverButtonBackground;
+	protected Color pressedButtonBackground;
 
 	private MouseAdapter hoverListener;
-	private boolean hoverTrack;
-	private boolean hoverThumb;
+	protected boolean hoverTrack;
+	protected boolean hoverThumb;
 
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatScrollBarUI();
@@ -102,24 +124,46 @@ public class FlatScrollBarUI
 	protected void installDefaults() {
 		super.installDefaults();
 
+		trackInsets = UIManager.getInsets( "ScrollBar.trackInsets" );
+		thumbInsets = UIManager.getInsets( "ScrollBar.thumbInsets" );
+		trackArc = UIManager.getInt( "ScrollBar.trackArc" );
+		thumbArc = UIManager.getInt( "ScrollBar.thumbArc" );
 		hoverTrackColor = UIManager.getColor( "ScrollBar.hoverTrackColor" );
 		hoverThumbColor = UIManager.getColor( "ScrollBar.hoverThumbColor" );
+		hoverThumbWithTrack = UIManager.getBoolean( "ScrollBar.hoverThumbWithTrack" );
+		pressedTrackColor = UIManager.getColor( "ScrollBar.pressedTrackColor" );
+		pressedThumbColor = UIManager.getColor( "ScrollBar.pressedThumbColor" );
+		pressedThumbWithTrack = UIManager.getBoolean( "ScrollBar.pressedThumbWithTrack" );
 
 		showButtons = UIManager.getBoolean( "ScrollBar.showButtons" );
 		arrowType = UIManager.getString( "Component.arrowType" );
 		buttonArrowColor = UIManager.getColor( "ScrollBar.buttonArrowColor" );
 		buttonDisabledArrowColor = UIManager.getColor( "ScrollBar.buttonDisabledArrowColor" );
+		hoverButtonBackground = UIManager.getColor( "ScrollBar.hoverButtonBackground" );
+		pressedButtonBackground = UIManager.getColor( "ScrollBar.pressedButtonBackground" );
+
+		// fallback (e.g. when used in NetBeans GUI builder)
+		if( trackInsets == null )
+			trackInsets = new Insets( 0, 0, 0, 0 );
+		if( thumbInsets == null )
+			thumbInsets = new Insets( 0, 0, 0, 0 );
 	}
 
 	@Override
 	protected void uninstallDefaults() {
 		super.uninstallDefaults();
 
+		trackInsets = null;
+		thumbInsets = null;
 		hoverTrackColor = null;
 		hoverThumbColor = null;
+		pressedTrackColor = null;
+		pressedThumbColor = null;
 
 		buttonArrowColor = null;
 		buttonDisabledArrowColor = null;
+		hoverButtonBackground = null;
+		pressedButtonBackground = null;
 	}
 
 	@Override
@@ -159,50 +203,62 @@ public class FlatScrollBarUI
 
 	@Override
 	protected JButton createDecreaseButton( int orientation ) {
-		return createArrowButton( orientation );
+		return new FlatScrollBarButton( orientation );
 	}
 
 	@Override
 	protected JButton createIncreaseButton( int orientation ) {
-		return createArrowButton( orientation );
+		return new FlatScrollBarButton( orientation );
 	}
 
-	private JButton createArrowButton( int orientation ) {
-		FlatArrowButton button = new FlatArrowButton( orientation,
-			arrowType, buttonArrowColor, buttonDisabledArrowColor, null, hoverTrackColor )
-		{
-			@Override
-			public Dimension getPreferredSize() {
-				if( isShowButtons() ) {
-					int w = UIScale.scale( scrollBarWidth );
-					return new Dimension( w, w );
-				} else
-					return new Dimension();
-			}
-
-			@Override
-			public Dimension getMinimumSize() {
-				return isShowButtons() ? super.getMinimumSize() : new Dimension();
-			}
-
-			@Override
-			public Dimension getMaximumSize() {
-				return isShowButtons() ? super.getMaximumSize() : new Dimension();
-			}
-		};
-		button.setArrowWidth( FlatArrowButton.DEFAULT_ARROW_WIDTH - 2 );
-		button.setFocusable( false );
-		button.setRequestFocusEnabled( false );
-		return button;
-	}
-
-	private boolean isShowButtons() {
+	protected boolean isShowButtons() {
 		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 );
 		return (showButtons != null) ? Objects.equals( showButtons, true ) : this.showButtons;
 	}
 
+	@Override
+	public void paint( Graphics g, JComponent c ) {
+		Object[] oldRenderingHints = FlatUIUtils.setRenderingHints( g );
+		super.paint( g, c );
+		FlatUIUtils.resetRenderingHints( g, oldRenderingHints );
+	}
+
+	@Override
+	protected void paintTrack( Graphics g, JComponent c, Rectangle trackBounds ) {
+		g.setColor( getTrackColor( c, hoverTrack, isPressed && hoverTrack && !hoverThumb ) );
+		paintTrackOrThumb( g, c, trackBounds, trackInsets, trackArc );
+	}
+
+	@Override
+	protected void paintThumb( Graphics g, JComponent c, Rectangle thumbBounds ) {
+		if( thumbBounds.isEmpty() || !scrollbar.isEnabled() )
+			return;
+
+		g.setColor( getThumbColor( c, hoverThumb || (hoverThumbWithTrack && hoverTrack),
+			isPressed && (hoverThumb || (pressedThumbWithTrack && hoverTrack)) ) );
+		paintTrackOrThumb( g, c, thumbBounds, thumbInsets, thumbArc );
+	}
+
+	protected void paintTrackOrThumb( Graphics g, JComponent c, Rectangle bounds, Insets insets, int arc ) {
+		// rotate insets for horizontal orientation because they are given for vertical orientation
+		if( scrollbar.getOrientation() == JScrollBar.HORIZONTAL )
+			insets = new Insets( insets.right, insets.top, insets.left, insets.bottom );
+
+		// subtract insets from bounds
+		bounds = FlatUIUtils.subtractInsets( bounds, UIScale.scale( insets ) );
+
+		if( arc <= 0 ) {
+			// paint rectangle
+			g.fillRect( bounds.x, bounds.y, bounds.width, bounds.height );
+		} else {
+			// paint round rectangle
+			arc = Math.min( UIScale.scale( arc ), Math.min( bounds.width, bounds.height ) );
+			g.fillRoundRect( bounds.x, bounds.y, bounds.width, bounds.height, arc, arc );
+		}
+	}
+
 	@Override
 	protected void paintDecreaseHighlight( Graphics g ) {
 		// do not paint
@@ -213,29 +269,33 @@ public class FlatScrollBarUI
 		// do not paint
 	}
 
-	@Override
-	protected void paintTrack( Graphics g, JComponent c, Rectangle trackBounds ) {
-		g.setColor( hoverTrack ? hoverTrackColor : trackColor );
-		g.fillRect( trackBounds.x, trackBounds.y, trackBounds.width, trackBounds.height );
+	protected Color getTrackColor( JComponent c, boolean hover, boolean pressed ) {
+		Color trackColor = FlatUIUtils.deriveColor( this.trackColor, c.getBackground() );
+		return (pressed && pressedTrackColor != null)
+			? FlatUIUtils.deriveColor( pressedTrackColor, trackColor )
+			: ((hover && hoverTrackColor != null)
+				? FlatUIUtils.deriveColor( hoverTrackColor, trackColor )
+				: trackColor);
 	}
 
-	@Override
-	protected void paintThumb( Graphics g, JComponent c, Rectangle thumbBounds ) {
-		if( thumbBounds.isEmpty() || !scrollbar.isEnabled() )
-			return;
-
-		g.setColor( hoverThumb ? hoverThumbColor : thumbColor );
-		g.fillRect( thumbBounds.x, thumbBounds.y, thumbBounds.width, thumbBounds.height );
+	protected Color getThumbColor( JComponent c, boolean hover, boolean pressed ) {
+		Color trackColor = FlatUIUtils.deriveColor( this.trackColor, c.getBackground() );
+		Color thumbColor = FlatUIUtils.deriveColor( this.thumbColor, trackColor );
+		return (pressed && pressedThumbColor != null)
+			? FlatUIUtils.deriveColor( pressedThumbColor, thumbColor )
+			: ((hover && hoverThumbColor != null)
+				? FlatUIUtils.deriveColor( hoverThumbColor, thumbColor )
+				: thumbColor);
 	}
 
 	@Override
 	protected Dimension getMinimumThumbSize() {
-		return UIScale.scale( super.getMinimumThumbSize() );
+		return UIScale.scale( FlatUIUtils.addInsets( super.getMinimumThumbSize(), thumbInsets ) );
 	}
 
 	@Override
 	protected Dimension getMaximumThumbSize() {
-		return UIScale.scale( super.getMaximumThumbSize() );
+		return UIScale.scale( FlatUIUtils.addInsets( super.getMaximumThumbSize(), thumbInsets ) );
 	}
 
 	//---- class ScrollBarHoverListener ---------------------------------------
@@ -263,11 +323,14 @@ public class FlatScrollBarUI
 		@Override
 		public void mousePressed( MouseEvent e ) {
 			isPressed = true;
+			repaint();
 		}
 
 		@Override
 		public void mouseReleased( MouseEvent e ) {
 			isPressed = false;
+			repaint();
+
 			update( e.getX(), e.getY() );
 		}
 
@@ -286,4 +349,49 @@ public class FlatScrollBarUI
 				scrollbar.repaint();
 		}
 	}
+
+	//---- class FlatScrollBarButton ------------------------------------------
+
+	protected class FlatScrollBarButton
+		extends FlatArrowButton
+	{
+		protected FlatScrollBarButton( int direction ) {
+			this( direction, arrowType, buttonArrowColor, buttonDisabledArrowColor,
+				null, hoverButtonBackground, pressedButtonBackground );
+		}
+
+		protected FlatScrollBarButton( int direction, String type, Color foreground, Color disabledForeground,
+			Color hoverForeground, Color hoverBackground, Color pressedBackground )
+		{
+			super( direction, type, foreground, disabledForeground, hoverForeground, hoverBackground, pressedBackground );
+
+			setArrowWidth( FlatArrowButton.DEFAULT_ARROW_WIDTH - 2 );
+			setFocusable( false );
+			setRequestFocusEnabled( false );
+		}
+
+		@Override
+		protected Color deriveBackground( Color background ) {
+			return FlatUIUtils.deriveColor( background, scrollbar.getBackground() );
+		}
+
+		@Override
+		public Dimension getPreferredSize() {
+			if( isShowButtons() ) {
+				int w = UIScale.scale( scrollBarWidth );
+				return new Dimension( w, w );
+			} else
+				return new Dimension();
+		}
+
+		@Override
+		public Dimension getMinimumSize() {
+			return isShowButtons() ? super.getMinimumSize() : new Dimension();
+		}
+
+		@Override
+		public Dimension getMaximumSize() {
+			return isShowButtons() ? super.getMaximumSize() : new Dimension();
+		}
+	}
 }

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

@@ -83,7 +83,7 @@ public class FlatScrollPaneUI
 		int focusWidth = UIManager.getInt( "Component.focusWidth" );
 		LookAndFeel.installProperty( c, "opaque", focusWidth == 0 );
 
-		MigLayoutVisualPadding.install( scrollpane, focusWidth );
+		MigLayoutVisualPadding.install( scrollpane );
 	}
 
 	@Override
@@ -114,10 +114,7 @@ public class FlatScrollPaneUI
 		return new BasicScrollPaneUI.MouseWheelHandler() {
 			@Override
 			public void mouseWheelMoved( MouseWheelEvent e ) {
-				// Note: Getting UI value "ScrollPane.smoothScrolling" here to allow
-				// applications to turn smooth scrolling on or off at any time
-				// (e.g. in application options dialog).
-				if( UIManager.getBoolean( "ScrollPane.smoothScrolling" ) &&
+				if( isSmoothScrollingEnabled() &&
 					scrollpane.isWheelScrollingEnabled() &&
 					e.getScrollType() == MouseWheelEvent.WHEEL_UNIT_SCROLL &&
 					e.getPreciseWheelRotation() != 0 &&
@@ -130,6 +127,17 @@ public class FlatScrollPaneUI
 		};
 	}
 
+	protected boolean isSmoothScrollingEnabled() {
+		Object smoothScrolling = scrollpane.getClientProperty( FlatClientProperties.SCROLL_PANE_SMOOTH_SCROLLING );
+		if( smoothScrolling instanceof Boolean )
+			return (Boolean) smoothScrolling;
+
+		// Note: Getting UI value "ScrollPane.smoothScrolling" here to allow
+		// applications to turn smooth scrolling on or off at any time
+		// (e.g. in application options dialog).
+		return UIManager.getBoolean( "ScrollPane.smoothScrolling" );
+	}
+
 	private static final double EPSILON = 1e-5d;
 
 	private void mouseWheelMovedSmooth( MouseWheelEvent e ) {

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

@@ -52,12 +52,8 @@ public class FlatSeparatorUI
 
 	private boolean defaults_initialized = false;
 
-	private static ComponentUI instance;
-
 	public static ComponentUI createUI( JComponent c ) {
-		if( instance == null )
-			instance = new FlatSeparatorUI();
-		return instance;
+		return FlatUIUtils.createSharedUI( FlatSeparatorUI.class, FlatSeparatorUI::new );
 	}
 
 	@Override

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

@@ -18,17 +18,23 @@ package com.formdev.flatlaf.ui;
 
 import java.awt.Color;
 import java.awt.Dimension;
+import java.awt.FontMetrics;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
-import java.awt.event.MouseListener;
+import java.awt.Rectangle;
+import java.awt.Shape;
+import java.awt.event.MouseEvent;
+import java.awt.geom.Ellipse2D;
 import java.awt.geom.Path2D;
 import java.awt.geom.RoundRectangle2D;
 import javax.swing.JComponent;
 import javax.swing.JSlider;
 import javax.swing.LookAndFeel;
+import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicSliderUI;
+import com.formdev.flatlaf.util.HiDPIUtils;
 import com.formdev.flatlaf.util.UIScale;
 
 /**
@@ -49,29 +55,46 @@ import com.formdev.flatlaf.util.UIScale;
  * <!-- FlatSliderUI -->
  *
  * @uiDefault Slider.trackWidth				int
- * @uiDefault Slider.thumbWidth				int
+ * @uiDefault Slider.thumbSize				Dimension
+ * @uiDefault Slider.focusWidth				int
+ * @uiDefault Slider.trackValueColor		Color	optional; defaults to Slider.thumbColor
  * @uiDefault Slider.trackColor				Color
  * @uiDefault Slider.thumbColor				Color
+ * @uiDefault Slider.thumbBorderColor		Color	optional; if null, no border is painted
  * @uiDefault Slider.focusedColor			Color	optional; defaults to Component.focusColor
- * @uiDefault Slider.hoverColor				Color	optional; defaults to Slider.focusedColor
- * @uiDefault Slider.disabledForeground		Color	used for track and thumb is disabled
+ * @uiDefault Slider.focusedThumbBorderColor Color	optional; defaults to Component.focusedBorderColor
+ * @uiDefault Slider.hoverThumbColor		Color	optional
+ * @uiDefault Slider.pressedThumbColor		Color	optional
+ * @uiDefault Slider.disabledTrackColor		Color
+ * @uiDefault Slider.disabledThumbColor		Color
+ * @uiDefault Slider.disabledThumbBorderColor Color	optional; defaults to Component.disabledBorderColor
  *
  * @author Karl Tauber
  */
 public class FlatSliderUI
 	extends BasicSliderUI
 {
-	private int trackWidth;
-	private int thumbWidth;
+	protected int trackWidth;
+	protected Dimension thumbSize;
+	protected int focusWidth;
 
-	private Color trackColor;
-	private Color thumbColor;
-	private Color focusColor;
-	private Color hoverColor;
-	private Color disabledForeground;
+	protected Color trackValueColor;
+	protected Color trackColor;
+	protected Color thumbColor;
+	protected Color thumbBorderColor;
+	protected Color focusBaseColor;
+	protected Color focusedColor;
+	protected Color focusedThumbBorderColor;
+	protected Color hoverThumbColor;
+	protected Color pressedThumbColor;
+	protected Color disabledTrackColor;
+	protected Color disabledThumbColor;
+	protected Color disabledThumbBorderColor;
 
-	private MouseListener hoverListener;
-	private boolean hover;
+	protected boolean thumbHover;
+	protected boolean thumbPressed;
+
+	private Object[] oldRenderingHints;
 
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatSliderUI();
@@ -81,24 +104,6 @@ public class FlatSliderUI
 		super( null );
 	}
 
-	@Override
-	protected void installListeners( JSlider slider ) {
-		super.installListeners( slider );
-
-		hoverListener = new FlatUIUtils.HoverListener( slider, h -> {
-			hover = h;
-		} );
-		slider.addMouseListener( hoverListener );
-	}
-
-	@Override
-	protected void uninstallListeners( JSlider slider ) {
-		super.uninstallListeners( slider );
-
-		slider.removeMouseListener( hoverListener );
-		hoverListener = null;
-	}
-
 	@Override
 	protected void installDefaults( JSlider slider ) {
 		super.installDefaults( slider );
@@ -106,24 +111,65 @@ public class FlatSliderUI
 		LookAndFeel.installProperty( slider, "opaque", false );
 
 		trackWidth = UIManager.getInt( "Slider.trackWidth" );
-		thumbWidth = UIManager.getInt( "Slider.thumbWidth" );
+		thumbSize = UIManager.getDimension( "Slider.thumbSize" );
+		if( thumbSize == null ) {
+			// fallback for compatibility with old versions
+			int thumbWidth = UIManager.getInt( "Slider.thumbWidth" );
+			thumbSize = new Dimension( thumbWidth, thumbWidth );
+		}
+		focusWidth = FlatUIUtils.getUIInt( "Slider.focusWidth", 4 );
 
+		trackValueColor = FlatUIUtils.getUIColor( "Slider.trackValueColor", "Slider.thumbColor" );
 		trackColor = UIManager.getColor( "Slider.trackColor" );
 		thumbColor = UIManager.getColor( "Slider.thumbColor" );
-		focusColor = FlatUIUtils.getUIColor( "Slider.focusedColor", "Component.focusColor" );
-		hoverColor = FlatUIUtils.getUIColor( "Slider.hoverColor", focusColor );
-		disabledForeground = UIManager.getColor( "Slider.disabledForeground" );
+		thumbBorderColor = UIManager.getColor( "Slider.thumbBorderColor" );
+		focusBaseColor = UIManager.getColor( "Component.focusColor" );
+		focusedColor = FlatUIUtils.getUIColor( "Slider.focusedColor", focusBaseColor );
+		focusedThumbBorderColor = FlatUIUtils.getUIColor( "Slider.focusedThumbBorderColor", "Component.focusedBorderColor" );
+		hoverThumbColor = UIManager.getColor( "Slider.hoverThumbColor" );
+		pressedThumbColor = UIManager.getColor( "Slider.pressedThumbColor" );
+		disabledTrackColor = UIManager.getColor( "Slider.disabledTrackColor" );
+		disabledThumbColor = UIManager.getColor( "Slider.disabledThumbColor" );
+		disabledThumbBorderColor = FlatUIUtils.getUIColor( "Slider.disabledThumbBorderColor", "Component.disabledBorderColor" );
 	}
 
 	@Override
 	protected void uninstallDefaults( JSlider slider ) {
 		super.uninstallDefaults( slider );
 
+		trackValueColor = null;
 		trackColor = null;
 		thumbColor = null;
-		focusColor = null;
-		hoverColor = null;
-		disabledForeground = null;
+		thumbBorderColor = null;
+		focusBaseColor = null;
+		focusedColor = null;
+		focusedThumbBorderColor = null;
+		hoverThumbColor = null;
+		pressedThumbColor = null;
+		disabledTrackColor = null;
+		disabledThumbColor = null;
+		disabledThumbBorderColor = null;
+	}
+
+	@Override
+	protected TrackListener createTrackListener( JSlider slider ) {
+		return new FlatTrackListener();
+	}
+
+	@Override
+	public int getBaseline( JComponent c, int width, int height ) {
+		if( c == null )
+			throw new NullPointerException();
+		if( width < 0 || height < 0 )
+			throw new IllegalArgumentException();
+
+		// no baseline for vertical orientation
+		if( slider.getOrientation() == JSlider.VERTICAL )
+			return -1;
+
+		// compute a baseline so that the track is vertically centered
+		FontMetrics fm = slider.getFontMetrics( slider.getFont() );
+		return trackRect.y + Math.round( (trackRect.height - fm.getHeight()) / 2f ) + fm.getAscent() - 1;
 	}
 
 	@Override
@@ -153,14 +199,50 @@ public class FlatSliderUI
 
 	@Override
 	protected Dimension getThumbSize() {
-		return new Dimension( UIScale.scale( thumbWidth ), UIScale.scale( thumbWidth ) );
+		return calcThumbSize( slider, thumbSize, focusWidth );
+	}
+
+	public static Dimension calcThumbSize( JSlider slider, Dimension thumbSize, int focusWidth ) {
+		int fw = UIScale.scale( focusWidth );
+		int w = UIScale.scale( thumbSize.width ) + fw + fw;
+		int h = UIScale.scale( thumbSize.height ) + fw + fw;
+		return (slider.getOrientation() == JSlider.HORIZONTAL)
+			? new Dimension( w, h )
+			: new Dimension( h, w );
 	}
 
 	@Override
 	public void paint( Graphics g, JComponent c ) {
-		FlatUIUtils.setRenderingHints( (Graphics2D) g );
+		oldRenderingHints = FlatUIUtils.setRenderingHints( g );
+
+/*debug
+		g.setColor( Color.gray );
+		g.drawRect( 0, 0, c.getWidth() - 1, c.getHeight() - 1 );
+		g.setColor( Color.orange );
+		g.drawRect( focusRect.x, focusRect.y, focusRect.width - 1, focusRect.height - 1 );
+		g.setColor( Color.magenta );
+		g.drawRect( contentRect.x, contentRect.y, contentRect.width - 1, contentRect.height - 1 );
+		g.setColor( Color.blue );
+		g.drawRect( trackRect.x, trackRect.y, trackRect.width - 1, trackRect.height - 1 );
+		g.setColor( Color.red );
+		g.drawRect( thumbRect.x, thumbRect.y, thumbRect.width - 1, thumbRect.height - 1 );
+		g.setColor( Color.green );
+		g.drawRect( tickRect.x, tickRect.y, tickRect.width - 1, tickRect.height - 1 );
+		g.setColor( Color.red );
+		g.drawRect( labelRect.x, labelRect.y, labelRect.width - 1, labelRect.height - 1 );
+debug*/
 
 		super.paint( g, c );
+
+		FlatUIUtils.resetRenderingHints( g, oldRenderingHints );
+		oldRenderingHints = null;
+	}
+
+	@Override
+	public void paintLabels( Graphics g ) {
+		FlatUIUtils.runWithoutRenderingHints( g, oldRenderingHints, () -> {
+			super.paintLabels( g );
+		} );
 	}
 
 	@Override
@@ -201,50 +283,308 @@ public class FlatSliderUI
 		}
 
 		if( coloredTrack != null ) {
-			FlatUIUtils.setColor( g, slider.hasFocus() ? focusColor : (hover ? hoverColor : thumbColor), thumbColor );
+			if( slider.getInverted() ) {
+				RoundRectangle2D temp = track;
+				track = coloredTrack;
+				coloredTrack = temp;
+			}
+
+			g.setColor( trackValueColor );
 			((Graphics2D)g).fill( coloredTrack );
 		}
 
-		g.setColor( enabled ? trackColor : disabledForeground );
+		g.setColor( enabled ? trackColor : disabledTrackColor );
 		((Graphics2D)g).fill( track );
 	}
 
 	@Override
 	public void paintThumb( Graphics g ) {
-		FlatUIUtils.setColor( g, slider.isEnabled()
-			? (slider.hasFocus() ? focusColor : (hover ? hoverColor : thumbColor))
-			: disabledForeground,
-			thumbColor );
+		Color color = stateColor( slider, thumbHover, thumbPressed,
+			thumbColor, disabledThumbColor, null, hoverThumbColor, pressedThumbColor );
+		color = FlatUIUtils.deriveColor( color, thumbColor );
 
-		if( isRoundThumb() )
-			g.fillOval( thumbRect.x, thumbRect.y, thumbRect.width, thumbRect.height );
-		else {
-			double w = thumbRect.width;
-			double h = thumbRect.height;
-			double wh = w / 2;
+		Color borderColor = (thumbBorderColor != null)
+			? stateColor( slider, false, false, thumbBorderColor, disabledThumbBorderColor, focusedThumbBorderColor, null, null )
+			: null;
 
-			Path2D thumb = FlatUIUtils.createPath( 0,0, w,0, w,(h - wh), wh,h,  0,(h - wh) );
+		Color focusedColor = FlatUIUtils.deriveColor( this.focusedColor, focusBaseColor );
 
+		paintThumb( g, slider, thumbRect, isRoundThumb(), color, borderColor, focusedColor, focusWidth );
+	}
+
+	public static void paintThumb( Graphics g, JSlider slider, Rectangle thumbRect, boolean roundThumb,
+		Color thumbColor, Color thumbBorderColor, Color focusedColor, int focusWidth )
+	{
+		double systemScaleFactor = UIScale.getSystemScaleFactor( (Graphics2D) g );
+		if( systemScaleFactor != 1 && systemScaleFactor != 2 ) {
+			// paint at scale 1x to avoid clipping on right and bottom edges at 125%, 150% or 175%
+			HiDPIUtils.paintAtScale1x( (Graphics2D) g, thumbRect.x, thumbRect.y, thumbRect.width, thumbRect.height,
+				(g2d, x2, y2, width2, height2, scaleFactor) -> {
+					paintThumbImpl( g, slider, x2, y2, width2, height2,
+						roundThumb, thumbColor, thumbBorderColor, focusedColor,
+						(float) (focusWidth * scaleFactor) );
+				} );
+			return;
+		}
+
+		paintThumbImpl( g, slider, thumbRect.x, thumbRect.y, thumbRect.width, thumbRect.height,
+			roundThumb, thumbColor, thumbBorderColor, focusedColor, focusWidth );
+
+	}
+
+	private static void paintThumbImpl( Graphics g, JSlider slider, int x, int y, int width, int height,
+		boolean roundThumb, Color thumbColor, Color thumbBorderColor, Color focusedColor, float focusWidth )
+	{
+		int fw = Math.round( UIScale.scale( focusWidth ) );
+		int tx = x + fw;
+		int ty = y + fw;
+		int tw = width - fw - fw;
+		int th = height - fw - fw;
+		boolean focused = FlatUIUtils.isPermanentFocusOwner( slider );
+
+		if( roundThumb ) {
+			// paint thumb focus border
+			if( focused ) {
+				g.setColor( focusedColor );
+				((Graphics2D)g).fill( createRoundThumbShape( x, y, width, height ) );
+			}
+
+			if( thumbBorderColor != null ) {
+				// paint thumb border
+				g.setColor( thumbBorderColor );
+				((Graphics2D)g).fill( createRoundThumbShape( tx, ty, tw, th ) );
+
+				// paint thumb background
+				float lw = UIScale.scale( 1f );
+				g.setColor( thumbColor );
+				((Graphics2D)g).fill( createRoundThumbShape( tx + lw, ty + lw,
+					tw - lw - lw, th - lw - lw ) );
+			} else {
+				// paint thumb background
+				g.setColor( thumbColor );
+				((Graphics2D)g).fill( createRoundThumbShape( tx, ty, tw, th ) );
+			}
+		} else {
 			Graphics2D g2 = (Graphics2D) g.create();
 			try {
-				g2.translate( thumbRect.x, thumbRect.y );
+				g2.translate( x, y );
 				if( slider.getOrientation() == JSlider.VERTICAL ) {
 					if( slider.getComponentOrientation().isLeftToRight() ) {
-						g2.translate( 0, thumbRect.height );
+						g2.translate( 0, height );
 						g2.rotate( Math.toRadians( 270 ) );
 					} else {
-						g2.translate( thumbRect.width, 0 );
+						g2.translate( width, 0 );
 						g2.rotate( Math.toRadians( 90 ) );
 					}
+
+					// rotate thumb width/height
+					int temp = tw;
+					tw = th;
+					th = temp;
+				}
+
+				// paint thumb focus border
+				if( focused ) {
+					g2.setColor( focusedColor );
+					g2.fill( createDirectionalThumbShape( 0, 0,
+						tw + fw + fw, th + fw + fw + (fw * 0.4142f), fw ) );
+				}
+
+				if( thumbBorderColor != null ) {
+					// paint thumb border
+					g2.setColor( thumbBorderColor );
+					g2.fill( createDirectionalThumbShape( fw, fw, tw, th, 0 ) );
+
+					// paint thumb background
+					float lw = UIScale.scale( 1f );
+					g2.setColor( thumbColor );
+					g2.fill( createDirectionalThumbShape( fw + lw, fw + lw,
+						tw - lw - lw, th - lw - lw - (lw * 0.4142f), 0 ) );
+				} else {
+					// paint thumb background
+					g2.setColor( thumbColor );
+					g2.fill( createDirectionalThumbShape( fw, fw, tw, th, 0 ) );
 				}
-				g2.fill( thumb );
 			} finally {
 				g2.dispose();
 			}
 		}
 	}
 
-	private boolean isRoundThumb() {
+	public static Shape createRoundThumbShape( float x, float y, float w, float h ) {
+		if( w == h )
+			return new Ellipse2D.Float( x, y, w, h );
+		else {
+			float arc = Math.min( w, h );
+			return new RoundRectangle2D.Float( x, y, w, h, arc, arc );
+		}
+	}
+
+	public static Shape createDirectionalThumbShape( float x, float y, float w, float h, float arc ) {
+		float wh = w / 2;
+
+		Path2D path = new Path2D.Float();
+		path.moveTo( x + wh, y + h );
+		path.lineTo( x, y + (h - wh) );
+		path.lineTo( x, y + arc );
+		path.quadTo( x, y, x + arc, y );
+		path.lineTo( x + (w - arc), y );
+		path.quadTo( x + w, y, x + w, y + arc );
+		path.lineTo( x + w, y + (h - wh) );
+		path.closePath();
+
+		return path;
+	}
+
+	public static Color stateColor( JSlider slider, boolean hover, boolean pressed,
+		Color enabledColor, Color disabledColor, Color focusedColor, Color hoverColor, Color pressedColor )
+	{
+		if( disabledColor != null && !slider.isEnabled() )
+			return disabledColor;
+		if( pressedColor != null && pressed )
+			return pressedColor;
+		if( hoverColor != null && hover )
+			return hoverColor;
+		if( focusedColor != null && FlatUIUtils.isPermanentFocusOwner( slider ) )
+			return focusedColor;
+		return enabledColor;
+	}
+
+	protected boolean isRoundThumb() {
 		return !slider.getPaintTicks() && !slider.getPaintLabels();
 	}
+
+	@Override
+	public void setThumbLocation( int x, int y ) {
+		if( !isRoundThumb() ) {
+			// the needle of the directional thumb is painted outside of thumbRect
+			// --> must increase repaint rectangle
+
+			// set new thumb location and compute union of old and new thumb bounds
+			Rectangle r = new Rectangle( thumbRect );
+			thumbRect.setLocation( x, y );
+			SwingUtilities.computeUnion( thumbRect.x, thumbRect.y, thumbRect.width, thumbRect.height, r );
+
+			// increase union rectangle for repaint
+			int extra = (int) Math.ceil( UIScale.scale( focusWidth ) * 0.4142f );
+			if( slider.getOrientation() == JSlider.HORIZONTAL )
+				r.height += extra;
+			else {
+				r.width += extra;
+				if( !slider.getComponentOrientation().isLeftToRight() )
+					r.x -= extra;
+			}
+
+			slider.repaint( r );
+		} else
+			super.setThumbLocation( x, y );
+	}
+
+	//---- class FlatTrackListener --------------------------------------------
+
+	protected class FlatTrackListener
+		extends TrackListener
+	{
+		@Override
+		public void mouseEntered( MouseEvent e ) {
+			setThumbHover( isOverThumb( e ) );
+			super.mouseEntered( e );
+		}
+
+		@Override
+		public void mouseExited( MouseEvent e ) {
+			setThumbHover( false );
+			super.mouseExited( e );
+		}
+
+		@Override
+		public void mouseMoved( MouseEvent e ) {
+			setThumbHover( isOverThumb( e ) );
+			super.mouseMoved( e );
+		}
+
+		@Override
+		public void mousePressed( MouseEvent e ) {
+			setThumbPressed( isOverThumb( e ) );
+
+			if( !slider.isEnabled() )
+				return;
+
+			// use "old" behavior when clicking on track
+			if( UIManager.getBoolean( "Slider.scrollOnTrackClick" ) ) {
+				super.mousePressed( e );
+				return;
+			}
+
+			// "new" behavior set thumb to mouse location when clicking on track
+
+			int x = e.getX();
+			int y = e.getY();
+
+			// clicked on thumb --> let super class do the work
+			calculateGeometry();
+			if( thumbRect.contains( x, y ) ) {
+				super.mousePressed( e );
+				return;
+			}
+
+			if( UIManager.getBoolean( "Slider.onlyLeftMouseButtonDrag" ) &&
+				!SwingUtilities.isLeftMouseButton( e ) )
+			  return;
+
+			// move the mouse event coordinates to the center of the thumb
+			int tx = thumbRect.x + (thumbRect.width / 2) - x;
+			int ty = thumbRect.y + (thumbRect.height / 2) - y;
+			e.translatePoint( tx, ty );
+
+			// invoke super mousePressed() to start dragging thumb
+			super.mousePressed( e );
+
+			// move the mouse event coordinates back to current mouse location
+			e.translatePoint( -tx, -ty );
+
+			// invoke mouseDragged() to update thumb location
+			mouseDragged( e );
+
+			setThumbPressed( true );
+		}
+
+		@Override
+		public void mouseReleased( MouseEvent e ) {
+			setThumbPressed( false );
+			super.mouseReleased( e );
+		}
+
+		@Override
+		public void mouseDragged( MouseEvent e ) {
+			super.mouseDragged( e );
+
+			if( isDragging() &&
+				slider.getSnapToTicks() &&
+				slider.isEnabled() &&
+				!UIManager.getBoolean( "Slider.snapToTicksOnReleased" ) )
+			{
+				calculateThumbLocation();
+				slider.repaint();
+			}
+		}
+
+		protected void setThumbHover( boolean hover ) {
+			if( hover != thumbHover ) {
+				thumbHover = hover;
+				slider.repaint( thumbRect );
+			}
+		}
+
+		protected void setThumbPressed( boolean pressed ) {
+			if( pressed != thumbPressed ) {
+				thumbPressed = pressed;
+				slider.repaint( thumbRect );
+			}
+		}
+
+		protected boolean isOverThumb( MouseEvent e ) {
+			return e != null && slider.isEnabled() && thumbRect.contains( e.getX(), e.getY() );
+		}
+	}
 }

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

@@ -40,6 +40,7 @@ import javax.swing.SwingConstants;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicSpinnerUI;
+import com.formdev.flatlaf.FlatClientProperties;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JSpinner}.
@@ -56,10 +57,9 @@ import javax.swing.plaf.basic.BasicSpinnerUI;
  *
  * <!-- FlatSpinnerUI -->
  *
- * @uiDefault Component.focusWidth				int
- * @uiDefault Component.arc						int
  * @uiDefault Component.minimumWidth			int
- * @uiDefault Component.arrowType				String	triangle (default) or chevron
+ * @uiDefault Spinner.buttonStyle				String	button (default) or none
+ * @uiDefault Component.arrowType				String	chevron (default) or triangle
  * @uiDefault Component.isIntelliJTheme			boolean
  * @uiDefault Component.borderColor				Color
  * @uiDefault Component.disabledBorderColor		Color
@@ -78,9 +78,8 @@ public class FlatSpinnerUI
 {
 	private Handler handler;
 
-	protected int focusWidth;
-	protected int arc;
 	protected int minimumWidth;
+	protected String buttonStyle;
 	protected String arrowType;
 	protected boolean isIntelliJTheme;
 	protected Color borderColor;
@@ -103,9 +102,8 @@ public class FlatSpinnerUI
 
 		LookAndFeel.installProperty( spinner, "opaque", false );
 
-		focusWidth = UIManager.getInt( "Component.focusWidth" );
-		arc = UIManager.getInt( "Component.arc" );
 		minimumWidth = UIManager.getInt( "Component.minimumWidth" );
+		buttonStyle = UIManager.getString( "Spinner.buttonStyle" );
 		arrowType = UIManager.getString( "Component.arrowType" );
 		isIntelliJTheme = UIManager.getBoolean( "Component.isIntelliJTheme" );
 		borderColor = UIManager.getColor( "Component.borderColor" );
@@ -121,7 +119,7 @@ public class FlatSpinnerUI
 		// scale
 		padding = scale( padding );
 
-		MigLayoutVisualPadding.install( spinner, focusWidth );
+		MigLayoutVisualPadding.install( spinner );
 	}
 
 	@Override
@@ -146,6 +144,7 @@ public class FlatSpinnerUI
 		super.installListeners();
 
 		addEditorFocusListener( spinner.getEditor() );
+		spinner.addFocusListener( getHandler() );
 		spinner.addPropertyChangeListener( getHandler() );
 	}
 
@@ -154,6 +153,7 @@ public class FlatSpinnerUI
 		super.uninstallListeners();
 
 		removeEditorFocusListener( spinner.getEditor() );
+		spinner.removeFocusListener( getHandler() );
 		spinner.removePropertyChangeListener( getHandler() );
 
 		handler = null;
@@ -206,17 +206,27 @@ public class FlatSpinnerUI
 			// use non-UIResource colors because when SwingUtilities.updateComponentTreeUI()
 			// is used, then the text field is updated after the spinner and the
 			// colors are again replaced with default colors
-			textField.setForeground( FlatUIUtils.nonUIResource( spinner.getForeground() ) );
-			textField.setDisabledTextColor( FlatUIUtils.nonUIResource( disabledForeground ) );
+			textField.setForeground( FlatUIUtils.nonUIResource( getForeground( true ) ) );
+			textField.setDisabledTextColor( FlatUIUtils.nonUIResource( getForeground( false ) ) );
 		}
 	}
 
-	private JTextField getEditorTextField( JComponent editor ) {
+	private static JTextField getEditorTextField( JComponent editor ) {
 		return editor instanceof JSpinner.DefaultEditor
 			? ((JSpinner.DefaultEditor)editor).getTextField()
 			: null;
 	}
 
+	protected Color getBackground( boolean enabled ) {
+		return enabled
+			? spinner.getBackground()
+			: (isIntelliJTheme ? FlatUIUtils.getParentBackground( spinner ) : disabledBackground);
+	}
+
+	protected Color getForeground( boolean enabled ) {
+		return enabled ? spinner.getForeground() : disabledForeground;
+	}
+
 	@Override
 	protected LayoutManager createLayout() {
 		return getHandler();
@@ -246,48 +256,55 @@ public class FlatSpinnerUI
 
 	@Override
 	public void update( Graphics g, JComponent c ) {
+		float focusWidth = FlatUIUtils.getBorderFocusWidth( c );
+		float arc = FlatUIUtils.getBorderArc( c );
+
 		// fill background if opaque to avoid garbage if user sets opaque to true
-		if( c.isOpaque() && (focusWidth > 0 || arc != 0) )
+		if( c.isOpaque() && (focusWidth > 0 || arc > 0) )
 			FlatUIUtils.paintParentBackground( g, c );
 
 		Graphics2D g2 = (Graphics2D) g;
-		FlatUIUtils.setRenderingHints( g2 );
+		Object[] oldRenderingHints = FlatUIUtils.setRenderingHints( g2 );
 
 		int width = c.getWidth();
 		int height = c.getHeight();
-		float focusWidth = (c.getBorder() instanceof FlatBorder) ? scale( (float) this.focusWidth ) : 0;
-		float arc = (c.getBorder() instanceof FlatRoundBorder) ? scale( (float) this.arc ) : 0;
-		Component nextButton = getHandler().nextButton;
-		int arrowX = nextButton.getX();
-		int arrowWidth = nextButton.getWidth();
 		boolean enabled = spinner.isEnabled();
-		boolean isLeftToRight = spinner.getComponentOrientation().isLeftToRight();
 
 		// paint background
-		g2.setColor( enabled
-			? c.getBackground()
-			: (isIntelliJTheme ? FlatUIUtils.getParentBackground( c ) : disabledBackground) );
+		g2.setColor( getBackground( enabled ) );
 		FlatUIUtils.paintComponentBackground( g2, 0, 0, width, height, focusWidth, arc );
 
-		// paint arrow buttons background
-		if( enabled ) {
-			g2.setColor( buttonBackground );
-			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 button background and separator
+		boolean paintButton = !"none".equals( buttonStyle );
+		Handler handler = getHandler();
+		if( paintButton && (handler.nextButton != null || handler.previousButton != null) ) {
+			Component button = (handler.nextButton != null) ? handler.nextButton : handler.previousButton;
+			int arrowX = button.getX();
+			int arrowWidth = button.getWidth();
+			boolean isLeftToRight = spinner.getComponentOrientation().isLeftToRight();
+
+			// paint arrow buttons background
+			if( enabled ) {
+				g2.setColor( buttonBackground );
+				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 buttons
+			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 vertical line between value and arrow buttons
-		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( g, c );
+
+		FlatUIUtils.resetRenderingHints( g, oldRenderingHints );
 	}
 
 	//---- class Handler ------------------------------------------------------
@@ -328,8 +345,9 @@ public class FlatSpinnerUI
 			// the arrows width is the same as the inner height so that the arrows area is square
 			int minimumWidth = FlatUIUtils.minimumWidth( spinner, FlatSpinnerUI.this.minimumWidth );
 			int innerHeight = editorSize.height + padding.top + padding.bottom;
+			float focusWidth = FlatUIUtils.getBorderFocusWidth( spinner );
 			return new Dimension(
-				Math.max( insets.left + insets.right + editorSize.width + padding.left + padding.right + innerHeight, scale( minimumWidth + (focusWidth * 2) ) ),
+				Math.max( insets.left + insets.right + editorSize.width + padding.left + padding.right + innerHeight, scale( minimumWidth ) + Math.round( focusWidth * 2 ) ),
 				insets.top + insets.bottom + innerHeight );
 		}
 
@@ -346,7 +364,7 @@ public class FlatSpinnerUI
 
 			if( nextButton == null && previousButton == null ) {
 				if( editor != null )
-					editor.setBounds( r );
+					editor.setBounds( FlatUIUtils.subtractInsets( r, padding ) );
 				return;
 			}
 
@@ -368,12 +386,14 @@ public class FlatSpinnerUI
 			if( editor != null )
 				editor.setBounds( FlatUIUtils.subtractInsets( editorRect, padding ) );
 
-			int nextHeight = Math.round( buttonsRect.height / 2f );
+			int nextHeight = (buttonsRect.height / 2) + (buttonsRect.height % 2); // round up
 			if( nextButton != null )
 				nextButton.setBounds( buttonsRect.x, buttonsRect.y, buttonsRect.width, nextHeight );
 			if( previousButton != null ) {
-				previousButton.setBounds( buttonsRect.x, buttonsRect.y + nextHeight,
-					buttonsRect.width, buttonsRect.height - nextHeight );
+				// for precise layout of arrows, the "previous" button has the same height
+				// as the "next" button and may overlap on uneven buttonsRect.height
+				int previousY = buttonsRect.y + buttonsRect.height - nextHeight;
+				previousButton.setBounds( buttonsRect.x, previousY, buttonsRect.width, nextHeight );
 			}
 		}
 
@@ -382,6 +402,13 @@ public class FlatSpinnerUI
 		@Override
 		public void focusGained( FocusEvent e ) {
 			spinner.repaint();
+
+			// if spinner gained focus, transfer it to the editor text field
+			if( e.getComponent() == spinner ) {
+				JTextField textField = getEditorTextField( spinner.getEditor() );
+				if( textField != null )
+					textField.requestFocusInWindow();
+			}
 		}
 
 		@Override
@@ -398,6 +425,14 @@ public class FlatSpinnerUI
 				case "enabled":
 					updateEditorColors();
 					break;
+
+				case FlatClientProperties.COMPONENT_ROUND_RECT:
+					spinner.repaint();
+					break;
+
+				case FlatClientProperties.MINIMUM_WIDTH:
+					spinner.revalidate();
+					break;
 			}
 		}
 	}

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

@@ -17,11 +17,17 @@
 package com.formdev.flatlaf.ui;
 
 import java.awt.Color;
+import java.awt.Container;
 import java.awt.Cursor;
+import java.awt.Graphics;
+import java.awt.Insets;
+import java.awt.event.MouseEvent;
+import java.beans.PropertyChangeEvent;
 import javax.swing.JButton;
 import javax.swing.JComponent;
 import javax.swing.JSplitPane;
 import javax.swing.SwingConstants;
+import javax.swing.ToolTipManager;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicSplitPaneDivider;
@@ -42,10 +48,15 @@ import com.formdev.flatlaf.util.UIScale;
  *
  * <!-- FlatSplitPaneUI -->
  *
- * @uiDefault Component.arrowType						String	triangle (default) or chevron
+ * @uiDefault Component.arrowType						String	chevron (default) or triangle
  * @uiDefault SplitPane.continuousLayout				boolean
  * @uiDefault SplitPaneDivider.oneTouchArrowColor		Color
  * @uiDefault SplitPaneDivider.oneTouchHoverArrowColor	Color
+ * @uiDefault SplitPaneDivider.style					String	grip (default) or plain
+ * @uiDefault SplitPaneDivider.gripColor				Color
+ * @uiDefault SplitPaneDivider.gripDotCount				int
+ * @uiDefault SplitPaneDivider.gripDotSize				int
+ * @uiDefault SplitPaneDivider.gripGap					int
  *
  * @author Karl Tauber
  */
@@ -54,8 +65,8 @@ public class FlatSplitPaneUI
 {
 	protected String arrowType;
 	private Boolean continuousLayout;
-	private Color oneTouchArrowColor;
-	private Color oneTouchHoverArrowColor;
+	protected Color oneTouchArrowColor;
+	protected Color oneTouchHoverArrowColor;
 
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatSplitPaneUI();
@@ -87,11 +98,19 @@ public class FlatSplitPaneUI
 
 	//---- class FlatSplitPaneDivider -----------------------------------------
 
-	private class FlatSplitPaneDivider
+	protected class FlatSplitPaneDivider
 		extends BasicSplitPaneDivider
 	{
-		public FlatSplitPaneDivider( BasicSplitPaneUI ui ) {
+		protected final String style = UIManager.getString( "SplitPaneDivider.style" );
+		protected final Color gripColor = UIManager.getColor( "SplitPaneDivider.gripColor" );
+		protected final int gripDotCount = FlatUIUtils.getUIInt( "SplitPaneDivider.gripDotCount", 3 );
+		protected final int gripDotSize = FlatUIUtils.getUIInt( "SplitPaneDivider.gripDotSize", 3 );
+		protected final int gripGap = FlatUIUtils.getUIInt( "SplitPaneDivider.gripGap", 2 );
+
+		protected FlatSplitPaneDivider( BasicSplitPaneUI ui ) {
 			super( ui );
+
+			setLayout( new FlatDividerLayout() );
 		}
 
 		@Override
@@ -109,16 +128,66 @@ public class FlatSplitPaneUI
 			return new FlatOneTouchButton( false );
 		}
 
+		@Override
+		public void propertyChange( PropertyChangeEvent e ) {
+			super.propertyChange( e );
+
+			switch( e.getPropertyName() ) {
+				case JSplitPane.DIVIDER_LOCATION_PROPERTY:
+					// necessary to show/hide one-touch buttons on expand/collapse
+					revalidate();
+					break;
+			}
+		}
+
+		@Override
+		public void paint( Graphics g ) {
+			super.paint( g );
+
+			if( "plain".equals( style ) )
+				return;
+
+			Object[] oldRenderingHints = FlatUIUtils.setRenderingHints( g );
+
+			g.setColor( gripColor );
+			paintGrip( g, 0, 0, getWidth(), getHeight() );
+
+			FlatUIUtils.resetRenderingHints( g, oldRenderingHints );
+		}
+
+		protected void paintGrip( Graphics g, int x, int y, int width, int height ) {
+			FlatUIUtils.paintGrip( g, x, y, width, height,
+				splitPane.getOrientation() == JSplitPane.VERTICAL_SPLIT,
+				gripDotCount, gripDotSize, gripGap, true );
+		}
+
+		protected boolean isLeftCollapsed() {
+			int location = splitPane.getDividerLocation();
+			Insets insets = splitPane.getInsets();
+			return (orientation == JSplitPane.VERTICAL_SPLIT)
+				? location == insets.top
+				: location == insets.left;
+		}
+
+		protected boolean isRightCollapsed() {
+			int location = splitPane.getDividerLocation();
+			Insets insets = splitPane.getInsets();
+			return (orientation == JSplitPane.VERTICAL_SPLIT)
+				? location == (splitPane.getHeight() - getHeight() - insets.bottom)
+				: location == (splitPane.getWidth() - getWidth() - insets.right);
+		}
+
 		//---- class FlatOneTouchButton ---------------------------------------
 
-		private class FlatOneTouchButton
+		protected class FlatOneTouchButton
 			extends FlatArrowButton
 		{
-			private final boolean left;
+			protected final boolean left;
 
-			public FlatOneTouchButton( boolean left ) {
+			protected FlatOneTouchButton( boolean left ) {
 				super( SwingConstants.NORTH, arrowType, oneTouchArrowColor, null, oneTouchHoverArrowColor, null );
 				setCursor( Cursor.getPredefinedCursor( Cursor.DEFAULT_CURSOR ) );
+				ToolTipManager.sharedInstance().registerComponent( this );
 
 				this.left = left;
 			}
@@ -129,7 +198,67 @@ public class FlatSplitPaneUI
 					? (left ? SwingConstants.NORTH : SwingConstants.SOUTH)
 					: (left ? SwingConstants.WEST : SwingConstants.EAST);
 			}
+
+			@Override
+			public String getToolTipText( MouseEvent e ) {
+				String key = (orientation == JSplitPane.VERTICAL_SPLIT)
+					? (left
+						? (isRightCollapsed()
+							? "SplitPaneDivider.expandBottomToolTipText"
+							: "SplitPaneDivider.collapseTopToolTipText")
+						: (isLeftCollapsed()
+							? "SplitPaneDivider.expandTopToolTipText"
+							: "SplitPaneDivider.collapseBottomToolTipText"))
+					: (left
+						? (isRightCollapsed()
+							? "SplitPaneDivider.expandRightToolTipText"
+							: "SplitPaneDivider.collapseLeftToolTipText")
+						: (isLeftCollapsed()
+							? "SplitPaneDivider.expandLeftToolTipText"
+							: "SplitPaneDivider.collapseRightToolTipText"));
+
+				// get text from client property
+				Object value = splitPane.getClientProperty( key );
+				if( value instanceof String )
+					return (String) value;
+
+				// get text from bundle
+				return UIManager.getString( key, getLocale() );
+			}
+		}
+
+		//---- class FlatDividerLayout ----------------------------------------
+
+		protected class FlatDividerLayout
+			extends DividerLayout
+		{
+			@Override
+			public void layoutContainer( Container c ) {
+				super.layoutContainer( c );
+
+				if( leftButton == null || rightButton == null || !splitPane.isOneTouchExpandable() )
+					return;
+
+				// increase side of buttons, which makes them easier to hit by the user
+				// and avoids cut arrows at small divider sizes
+				int extraSize = UIScale.scale( 4 );
+				if( orientation == JSplitPane.VERTICAL_SPLIT ) {
+					leftButton.setSize( leftButton.getWidth() + extraSize, leftButton.getHeight() );
+					rightButton.setBounds( leftButton.getX() + leftButton.getWidth(), rightButton.getY(),
+						rightButton.getWidth() + extraSize, rightButton.getHeight() );
+				} else {
+					leftButton.setSize( leftButton.getWidth(), leftButton.getHeight() + extraSize );
+					rightButton.setBounds( rightButton.getX(), leftButton.getY() + leftButton.getHeight(),
+						rightButton.getWidth(), rightButton.getHeight() + extraSize );
+				}
+
+				// hide buttons if not applicable
+				boolean leftCollapsed = isLeftCollapsed();
+				if( leftCollapsed )
+					rightButton.setLocation( leftButton.getLocation() );
+				leftButton.setVisible( !leftCollapsed );
+				rightButton.setVisible( !isRightCollapsed() );
+			}
 		}
 	}
-
 }

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

@@ -86,7 +86,7 @@ public class FlatTableCellBorder
 		/**
 		 * Checks whether at least one selected cell is editable.
 		 */
-		private boolean isSelectionEditable( JTable table ) {
+		protected boolean isSelectionEditable( JTable table ) {
 			if( table.getRowSelectionAllowed() ) {
 				int columnCount = table.getColumnCount();
 				int[] selectedRows = table.getSelectedRows();

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

@@ -31,6 +31,7 @@ import javax.swing.JComponent;
 import javax.swing.JLabel;
 import javax.swing.JScrollPane;
 import javax.swing.JTable;
+import javax.swing.ScrollPaneConstants;
 import javax.swing.SwingConstants;
 import javax.swing.UIManager;
 import javax.swing.border.Border;
@@ -86,36 +87,25 @@ public class FlatTableHeaderUI
 			case "top":		sortIconPosition = SwingConstants.TOP; break;
 			case "bottom":	sortIconPosition = SwingConstants.BOTTOM; break;
 		}
-
-		// use own renderer if necessary
-		if( sortIconPosition != SwingConstants.RIGHT ) {
-			TableCellRenderer defaultRenderer = header.getDefaultRenderer();
-			if( defaultRenderer instanceof UIResource )
-				header.setDefaultRenderer( new FlatTableCellHeaderRenderer( defaultRenderer ) );
-		}
 	}
 
 	@Override
 	protected void uninstallDefaults() {
 		super.uninstallDefaults();
 
-		// restore default renderer
-		TableCellRenderer defaultRenderer = header.getDefaultRenderer();
-		if( defaultRenderer instanceof FlatTableCellHeaderRenderer ) {
-			((FlatTableCellHeaderRenderer)defaultRenderer).reset();
-			header.setDefaultRenderer( ((FlatTableCellHeaderRenderer)defaultRenderer).delegate );
-		}
-
 		separatorColor = null;
 		bottomSeparatorColor = null;
 	}
 
 	@Override
 	public void paint( Graphics g, JComponent c ) {
+		if( header.getColumnModel().getColumnCount() <= 0 )
+			return;
+
 		// do not paint borders if JTableHeader.setDefaultRenderer() was used
 		TableCellRenderer defaultRenderer = header.getDefaultRenderer();
 		boolean paintBorders = isSystemDefaultRenderer( defaultRenderer );
-		if( !paintBorders && header.getColumnModel().getColumnCount() > 0 ) {
+		if( !paintBorders ) {
 			// check whether the renderer delegates to the system default renderer
 			Component rendererComponent = defaultRenderer.getTableCellRendererComponent(
 				header.getTable(), "", false, false, -1, 0 );
@@ -125,8 +115,22 @@ public class FlatTableHeaderUI
 		if( paintBorders )
 			paintColumnBorders( g, c );
 
+		// temporary use own default renderer if necessary
+		FlatTableCellHeaderRenderer sortIconRenderer = null;
+		if( sortIconPosition != SwingConstants.RIGHT ) {
+			sortIconRenderer = new FlatTableCellHeaderRenderer( header.getDefaultRenderer() );
+			header.setDefaultRenderer( sortIconRenderer );
+		}
+
+		// paint header
 		super.paint( g, c );
 
+		// restore default renderer
+		if( sortIconRenderer != null ) {
+			sortIconRenderer.reset();
+			header.setDefaultRenderer( sortIconRenderer.delegate );
+		}
+
 		if( paintBorders )
 			paintDraggedColumnBorders( g, c );
 	}
@@ -145,6 +149,9 @@ public class FlatTableHeaderUI
 		float bottomLineIndent = lineWidth * 3;
 		TableColumnModel columnModel = header.getColumnModel();
 		int columnCount = columnModel.getColumnCount();
+		int sepCount = columnCount;
+		if( hideLastVerticalLine() )
+			sepCount--;
 
 		Graphics2D g2 = (Graphics2D) g.create();
 		try {
@@ -157,23 +164,30 @@ public class FlatTableHeaderUI
 			// paint column separator lines
 			g2.setColor( separatorColor );
 
-			int sepCount = columnCount;
-			if( header.getTable().getAutoResizeMode() != JTable.AUTO_RESIZE_OFF && !isVerticalScrollBarVisible() )
-				sepCount--;
+			float y = topLineIndent;
+			float h = height - bottomLineIndent;
 
 			if( header.getComponentOrientation().isLeftToRight() ) {
 				int x = 0;
 				for( int i = 0; i < sepCount; i++ ) {
 					x += columnModel.getColumn( i ).getWidth();
-					g2.fill( new Rectangle2D.Float( x - lineWidth, topLineIndent, lineWidth, height - bottomLineIndent ) );
+					g2.fill( new Rectangle2D.Float( x - lineWidth, y, lineWidth, h ) );
 				}
+
+				// paint trailing separator (on right side)
+				if( !hideTrailingVerticalLine() )
+					g2.fill( new Rectangle2D.Float( header.getWidth() - lineWidth, y, lineWidth, h ) );
 			} else {
-				int x = width;
+				Rectangle cellRect = header.getHeaderRect( 0 );
+				int x = cellRect.x + cellRect.width;
 				for( int i = 0; i < sepCount; i++ ) {
 					x -= columnModel.getColumn( i ).getWidth();
-					g2.fill( new Rectangle2D.Float( x - (i < sepCount - 1 ? lineWidth : 0),
-						topLineIndent, lineWidth, height - bottomLineIndent ) );
+					g2.fill( new Rectangle2D.Float( x - (i < sepCount - 1 ? lineWidth : 0), y, lineWidth, h ) );
 				}
+
+				// paint trailing separator (on left side)
+				if( !hideTrailingVerticalLine() )
+					g2.fill( new Rectangle2D.Float( 0, y, lineWidth, h ) );
 			}
 		} finally {
 			g2.dispose();
@@ -230,20 +244,30 @@ public class FlatTableHeaderUI
 		return size;
 	}
 
-	private boolean isVerticalScrollBarVisible() {
-		JScrollPane scrollPane = getScrollPane();
-		return (scrollPane != null && scrollPane.getVerticalScrollBar() != null)
-			? scrollPane.getVerticalScrollBar().isVisible()
-			: false;
+	protected boolean hideLastVerticalLine() {
+		Container viewport = header.getParent();
+		Container viewportParent = (viewport != null) ? viewport.getParent() : null;
+		if( !(viewportParent instanceof JScrollPane) )
+			return false;
+
+		Rectangle cellRect = header.getHeaderRect( header.getColumnModel().getColumnCount() - 1 );
+
+		// using component orientation of scroll pane here because it is also used in FlatTableUI
+		JScrollPane scrollPane = (JScrollPane) viewportParent;
+		return scrollPane.getComponentOrientation().isLeftToRight()
+			? cellRect.x + cellRect.width >= viewport.getWidth()
+			: cellRect.x <= 0;
 	}
 
-	private JScrollPane getScrollPane() {
-		Container parent = header.getParent();
-		if( parent == null )
-			return null;
+	protected boolean hideTrailingVerticalLine() {
+		Container viewport = header.getParent();
+		Container viewportParent = (viewport != null) ? viewport.getParent() : null;
+		if( !(viewportParent instanceof JScrollPane) )
+			return false;
 
-		parent = parent.getParent();
-		return (parent instanceof JScrollPane) ? (JScrollPane) parent : null;
+		JScrollPane scrollPane = (JScrollPane) viewportParent;
+		return viewport == scrollPane.getColumnHeader() &&
+			scrollPane.getCorner( ScrollPaneConstants.UPPER_TRAILING_CORNER ) == null;
 	}
 
 	//---- class FlatTableCellHeaderRenderer ----------------------------------
@@ -257,6 +281,7 @@ public class FlatTableHeaderUI
 	{
 		private final TableCellRenderer delegate;
 
+		private JLabel l;
 		private int oldHorizontalTextPosition = -1;
 		private Border origBorder;
 		private Icon sortIcon;
@@ -273,7 +298,7 @@ public class FlatTableHeaderUI
 			if( !(c instanceof JLabel) )
 				return c;
 
-			JLabel l = (JLabel) c;
+			l = (JLabel) c;
 
 			if( sortIconPosition == SwingConstants.LEFT ) {
 				if( oldHorizontalTextPosition < 0 )
@@ -291,11 +316,8 @@ public class FlatTableHeaderUI
 		}
 
 		void reset() {
-			if( sortIconPosition == SwingConstants.LEFT && oldHorizontalTextPosition >= 0 ) {
-				Component c = getTableCellRendererComponent( header.getTable(), "", false, false, -1, 0 );
-				if( c instanceof JLabel && ((JLabel)c).getHorizontalTextPosition() == SwingConstants.RIGHT )
-					((JLabel)c).setHorizontalTextPosition( oldHorizontalTextPosition );
-			}
+			if( l != null && sortIconPosition == SwingConstants.LEFT && oldHorizontalTextPosition >= 0 )
+				l.setHorizontalTextPosition( oldHorizontalTextPosition );
 		}
 
 		@Override

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

@@ -17,14 +17,25 @@
 package com.formdev.flatlaf.ui;
 
 import java.awt.Color;
+import java.awt.Container;
 import java.awt.Dimension;
+import java.awt.EventQueue;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
 import java.awt.event.FocusEvent;
 import java.awt.event.FocusListener;
+import java.awt.geom.Rectangle2D;
+import javax.swing.JCheckBox;
 import javax.swing.JComponent;
+import javax.swing.JScrollPane;
+import javax.swing.JViewport;
 import javax.swing.LookAndFeel;
+import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicTableUI;
+import javax.swing.table.TableCellRenderer;
+import com.formdev.flatlaf.util.Graphics2DProxy;
 import com.formdev.flatlaf.util.UIScale;
 
 /**
@@ -68,6 +79,10 @@ import com.formdev.flatlaf.util.UIScale;
  * @uiDefault Table.cellFocusColor						Color
  * @uiDefault Table.showCellFocusIndicator				boolean
  *
+ * <!-- FlatInputMaps -->
+ *
+ * @uiDefault Table.consistentHomeEndKeyBehavior		boolean
+ *
  * @author Karl Tauber
  */
 public class FlatTableUI
@@ -90,16 +105,6 @@ public class FlatTableUI
 		return new FlatTableUI();
 	}
 
-	@Override
-	public void installUI( JComponent c ) {
-		super.installUI( c );
-	}
-
-	@Override
-	public void uninstallUI( JComponent c ) {
-		super.uninstallUI( c );
-	}
-
 	@Override
 	protected void installDefaults() {
 		super.installDefaults();
@@ -113,7 +118,7 @@ public class FlatTableUI
 		selectionInactiveBackground = UIManager.getColor( "Table.selectionInactiveBackground" );
 		selectionInactiveForeground = UIManager.getColor( "Table.selectionInactiveForeground" );
 
-		toggleSelectionColors( table.hasFocus() );
+		toggleSelectionColors();
 
 		int rowHeight = FlatUIUtils.getUIInt( "Table.rowHeight", 16 );
 		if( rowHeight > 0 )
@@ -132,6 +137,12 @@ public class FlatTableUI
 			oldIntercellSpacing = table.getIntercellSpacing();
 			table.setIntercellSpacing( intercellSpacing );
 		}
+
+		// checkbox is non-opaque in FlatLaf and therefore would not paint selection
+		// --> make checkbox renderer opaque (but opaque in Metal or Windows LaF)
+		TableCellRenderer booleanRenderer = table.getDefaultRenderer( Boolean.class );
+		if( booleanRenderer instanceof JCheckBox )
+			((JCheckBox)booleanRenderer).setOpaque( true );
 	}
 
 	@Override
@@ -160,13 +171,17 @@ public class FlatTableUI
 			@Override
 			public void focusGained( FocusEvent e ) {
 				super.focusGained( e );
-				toggleSelectionColors( true );
+				toggleSelectionColors();
 			}
 
 			@Override
 			public void focusLost( FocusEvent e ) {
 				super.focusLost( e );
-				toggleSelectionColors( false );
+
+				// use invokeLater for the case that the window is deactivated
+				EventQueue.invokeLater( () -> {
+					toggleSelectionColors();
+				} );
 			}
 		};
 	}
@@ -180,8 +195,11 @@ public class FlatTableUI
 	 * already used in applications. Then either the inactive colors are not used,
 	 * or the application has to be changed to extend a FlatLaf renderer.
 	 */
-	private void toggleSelectionColors( boolean focused ) {
-		if( focused ) {
+	private void toggleSelectionColors() {
+		if( table == null )
+			return;
+
+		if( FlatUIUtils.isPermanentFocusOwner( table ) ) {
 			if( table.getSelectionBackground() == selectionInactiveBackground )
 				table.setSelectionBackground( selectionBackground );
 			if( table.getSelectionForeground() == selectionInactiveForeground )
@@ -193,4 +211,94 @@ public class FlatTableUI
 				table.setSelectionForeground( selectionInactiveForeground );
 		}
 	}
+
+	@Override
+	public void paint( Graphics g, JComponent c ) {
+		boolean horizontalLines = table.getShowHorizontalLines();
+		boolean verticalLines = table.getShowVerticalLines();
+		if( horizontalLines || verticalLines ) {
+			// fix grid painting issues in BasicTableUI
+			//   - do not paint last vertical grid line if line is on right edge of scroll pane
+			//   - fix unstable grid line thickness when scaled at 125%, 150%, 175%, 225%, ...
+			//     which paints either 1px or 2px lines depending on location
+
+			boolean hideLastVerticalLine = hideLastVerticalLine();
+			int tableWidth = table.getWidth();
+
+			double systemScaleFactor = UIScale.getSystemScaleFactor( (Graphics2D) g );
+			double lineThickness = (1. / systemScaleFactor) * (int) systemScaleFactor;
+
+			// Java 8 uses drawLine() to paint grid lines
+			// Java 9+ uses fillRect() to paint grid lines
+			g = new Graphics2DProxy( (Graphics2D) g ) {
+				@Override
+				public void drawLine( int x1, int y1, int x2, int y2 ) {
+					// do not paint last vertical line
+					if( hideLastVerticalLine && verticalLines &&
+						x1 == x2 && y1 == 0 && x1 == tableWidth - 1 &&
+						wasInvokedFromPaintGrid() )
+					  return;
+
+					super.drawLine( x1, y1, x2, y2 );
+				}
+
+				@Override
+				public void fillRect( int x, int y, int width, int height ) {
+					// do not paint last vertical line
+					if( hideLastVerticalLine && verticalLines &&
+						width == 1 && y == 0 && x == tableWidth - 1 &&
+						wasInvokedFromPaintGrid() )
+					  return;
+
+					// reduce line thickness to avoid unstable painted line thickness
+					if( lineThickness != 1 ) {
+						if( horizontalLines && height == 1 && wasInvokedFromPaintGrid() ) {
+							super.fill( new Rectangle2D.Double( x, y, width, lineThickness ) );
+							return;
+						}
+						if( verticalLines && width == 1 && y == 0 && wasInvokedFromPaintGrid() ) {
+							super.fill( new Rectangle2D.Double( x, y, lineThickness, height ) );
+							return;
+						}
+					}
+
+					super.fillRect( x, y, width, height );
+				}
+
+				private boolean wasInvokedFromPaintGrid() {
+					StackTraceElement[] stackTrace = Thread.currentThread().getStackTrace();
+					for( int i = 0; i < 10 || i < stackTrace.length; i++ ) {
+						if( "javax.swing.plaf.basic.BasicTableUI".equals( stackTrace[i].getClassName() ) &&
+							"paintGrid".equals( stackTrace[i].getMethodName() ) )
+						  return true;
+					}
+					return false;
+				}
+			};
+		}
+
+		super.paint( g, c );
+	}
+
+	protected boolean hideLastVerticalLine() {
+		Container viewport = SwingUtilities.getUnwrappedParent( table );
+		Container viewportParent = (viewport != null) ? viewport.getParent() : null;
+		if( !(viewportParent instanceof JScrollPane) )
+			return false;
+
+		// do not hide last vertical line if table is smaller than viewport
+		if( table.getX() + table.getWidth() < viewport.getWidth() )
+			return false;
+
+		// in left-to-right:
+		//   - do not hide last vertical line if table used as row header in scroll pane
+		// in right-to-left:
+		//   - hide last vertical line if table used as row header in scroll pane
+		//   - do not hide last vertical line if table is in center and scroll pane has row header
+		JScrollPane scrollPane = (JScrollPane) viewportParent;
+		JViewport rowHeader = scrollPane.getRowHeader();
+		return scrollPane.getComponentOrientation().isLeftToRight()
+			? (viewport != rowHeader)
+			: (viewport == rowHeader || rowHeader == null);
+	}
 }

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

@@ -16,10 +16,11 @@
 
 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.beans.PropertyChangeEvent;
 import javax.swing.JComponent;
 import javax.swing.JTextArea;
 import javax.swing.UIManager;
@@ -27,6 +28,7 @@ import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicTextAreaUI;
 import javax.swing.text.JTextComponent;
+import com.formdev.flatlaf.util.HiDPIUtils;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JTextArea}.
@@ -58,6 +60,7 @@ public class FlatTextAreaUI
 {
 	protected int minimumWidth;
 	protected boolean isIntelliJTheme;
+	protected Color background;
 	protected Color disabledBackground;
 	protected Color inactiveBackground;
 
@@ -65,12 +68,20 @@ public class FlatTextAreaUI
 		return new FlatTextAreaUI();
 	}
 
+	@Override
+	public void installUI( JComponent c ) {
+		super.installUI( c );
+
+		updateBackground();
+	}
+
 	@Override
 	protected void installDefaults() {
 		super.installDefaults();
 
 		minimumWidth = UIManager.getInt( "Component.minimumWidth" );
 		isIntelliJTheme = UIManager.getBoolean( "Component.isIntelliJTheme" );
+		background = UIManager.getColor( "TextArea.background" );
 		disabledBackground = UIManager.getColor( "TextArea.disabledBackground" );
 		inactiveBackground = UIManager.getColor( "TextArea.inactiveBackground" );
 	}
@@ -79,46 +90,80 @@ public class FlatTextAreaUI
 	protected void uninstallDefaults() {
 		super.uninstallDefaults();
 
+		background = null;
 		disabledBackground = null;
 		inactiveBackground = null;
 	}
 
+	@Override
+	protected void propertyChange( PropertyChangeEvent e ) {
+		super.propertyChange( e );
+		FlatEditorPaneUI.propertyChange( getComponent(), e );
+
+		switch( e.getPropertyName() ) {
+			case "editable":
+			case "enabled":
+				updateBackground();
+				break;
+		}
+	}
+
+	private void updateBackground() {
+		JTextComponent c = getComponent();
+
+		Color background = c.getBackground();
+		if( !(background instanceof UIResource) )
+			return;
+
+		// do not update background if it currently has a unknown color (assigned from outside)
+		if( background != this.background &&
+			background != disabledBackground &&
+			background != inactiveBackground )
+		  return;
+
+		Color newBackground = !c.isEnabled()
+			? disabledBackground
+			: (!c.isEditable()
+				? inactiveBackground
+				: this.background);
+
+		if( newBackground != background )
+			c.setBackground( newBackground );
+	}
+
+	@Override
+	public Dimension getPreferredSize( JComponent c ) {
+		return applyMinimumWidth( c, super.getPreferredSize( c ) );
+	}
+
+	@Override
+	public Dimension getMinimumSize( JComponent c ) {
+		return applyMinimumWidth( c, super.getMinimumSize( c ) );
+	}
+
+	private Dimension applyMinimumWidth( JComponent c, Dimension size ) {
+		// do not apply minimum width if JTextArea.columns is set
+		if( c instanceof JTextArea && ((JTextArea)c).getColumns() > 0 )
+			return size;
+
+		return FlatEditorPaneUI.applyMinimumWidth( c, size, minimumWidth );
+	}
+
+	@Override
+	protected void paintSafely( Graphics g ) {
+		super.paintSafely( HiDPIUtils.createGraphicsTextYCorrection( (Graphics2D) g ) );
+	}
+
 	@Override
 	protected void paintBackground( Graphics g ) {
 		JTextComponent c = getComponent();
 
-		Color background = c.getBackground();
-		g.setColor( !(background instanceof UIResource)
-			? background
-			: (isIntelliJTheme && (!c.isEnabled() || !c.isEditable())
-				? FlatUIUtils.getParentBackground( c )
-				: (!c.isEnabled()
-					? disabledBackground
-					: (!c.isEditable() ? inactiveBackground : background))) );
-		g.fillRect( 0, 0, c.getWidth(), c.getHeight() );
-	}
+		// for compatibility with IntelliJ themes
+		if( isIntelliJTheme && (!c.isEnabled() || !c.isEditable()) && (c.getBackground() instanceof UIResource) ) {
+			FlatUIUtils.paintParentBackground( g, c );
+			return;
+		}
 
-	@Override
-	public Dimension getPreferredSize( JComponent c ) {
-		return applyMinimumWidth( super.getPreferredSize( c ), c );
-	}
-
-	@Override
-	public Dimension getMinimumSize( JComponent c ) {
-		return applyMinimumWidth( super.getMinimumSize( c ), c );
-	}
-
-	private Dimension applyMinimumWidth( Dimension size, JComponent c ) {
-		// do not apply minimum width if JTextArea.columns is set
-		if( c instanceof JTextArea && ((JTextArea)c).getColumns() > 0 )
-			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
-		// issues. E.g. at scale factor 1.5 the first returns 4, but the second 3.
-		int minimumWidth = FlatUIUtils.minimumWidth( getComponent(), this.minimumWidth );
-		size.width = Math.max( size.width, scale( minimumWidth ) - (scale( 1 ) * 2) );
-		return size;
+		super.paintBackground( g );
 	}
 }

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

@@ -16,14 +16,13 @@
 
 package com.formdev.flatlaf.ui;
 
-import static com.formdev.flatlaf.util.UIScale.scale;
 import java.awt.Component;
 import javax.swing.UIManager;
 
 /**
  * Border for various text components (e.g. {@link javax.swing.JTextField}).
  *
- * @uiDefault Component.arc					int
+ * @uiDefault TextComponent.arc				int
  *
  * @author Karl Tauber
  */
@@ -33,7 +32,11 @@ public class FlatTextBorder
 	protected final int arc = UIManager.getInt( "TextComponent.arc" );
 
 	@Override
-	protected float getArc( Component c ) {
-		return scale( (float) arc );
+	protected int getArc( Component c ) {
+		if( isCellEditor( c ) )
+			return 0;
+
+		Boolean roundRect = FlatUIUtils.isRoundRect( c );
+		return roundRect != null ? (roundRect ? Short.MAX_VALUE : 0) : arc;
 	}
 }

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

@@ -32,13 +32,13 @@ import javax.swing.JSpinner;
 import javax.swing.JTextField;
 import javax.swing.LookAndFeel;
 import javax.swing.UIManager;
-import javax.swing.border.Border;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicTextFieldUI;
 import javax.swing.text.Caret;
 import javax.swing.text.JTextComponent;
 import com.formdev.flatlaf.FlatClientProperties;
+import com.formdev.flatlaf.util.HiDPIUtils;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JTextField}.
@@ -60,20 +60,17 @@ import com.formdev.flatlaf.FlatClientProperties;
  *
  * <!-- FlatTextFieldUI -->
  *
- * @uiDefault TextComponent.arc					int
- * @uiDefault Component.focusWidth				int
  * @uiDefault Component.minimumWidth			int
  * @uiDefault Component.isIntelliJTheme			boolean
  * @uiDefault TextField.placeholderForeground	Color
  * @uiDefault TextComponent.selectAllOnFocusPolicy	String	never, once (default) or always
+ * @uiDefault TextComponent.selectAllOnMouseClick	boolean
  *
  * @author Karl Tauber
  */
 public class FlatTextFieldUI
 	extends BasicTextFieldUI
 {
-	protected int arc;
-	protected int focusWidth;
 	protected int minimumWidth;
 	protected boolean isIntelliJTheme;
 	protected Color placeholderForeground;
@@ -89,15 +86,13 @@ public class FlatTextFieldUI
 		super.installDefaults();
 
 		String prefix = getPropertyPrefix();
-		arc = UIManager.getInt( "TextComponent.arc" );
-		focusWidth = UIManager.getInt( "Component.focusWidth" );
 		minimumWidth = UIManager.getInt( "Component.minimumWidth" );
 		isIntelliJTheme = UIManager.getBoolean( "Component.isIntelliJTheme" );
 		placeholderForeground = UIManager.getColor( prefix + ".placeholderForeground" );
 
-		LookAndFeel.installProperty( getComponent(), "opaque", focusWidth == 0 );
+		LookAndFeel.installProperty( getComponent(), "opaque", false );
 
-		MigLayoutVisualPadding.install( getComponent(), focusWidth );
+		MigLayoutVisualPadding.install( getComponent() );
 	}
 
 	@Override
@@ -127,22 +122,35 @@ public class FlatTextFieldUI
 
 	@Override
 	protected Caret createCaret() {
-		return new FlatCaret( UIManager.getString( "TextComponent.selectAllOnFocusPolicy" ) );
+		return new FlatCaret( UIManager.getString( "TextComponent.selectAllOnFocusPolicy"),
+			UIManager.getBoolean( "TextComponent.selectAllOnMouseClick" ) );
 	}
 
 	@Override
 	protected void propertyChange( PropertyChangeEvent e ) {
 		super.propertyChange( e );
+		propertyChange( getComponent(), e );
+	}
 
-		if( FlatClientProperties.PLACEHOLDER_TEXT.equals( e.getPropertyName() ) )
-			getComponent().repaint();
+	static void propertyChange( JTextComponent c, PropertyChangeEvent e ) {
+		switch( e.getPropertyName() ) {
+			case FlatClientProperties.PLACEHOLDER_TEXT:
+			case FlatClientProperties.COMPONENT_ROUND_RECT:
+				c.repaint();
+				break;
+
+			case FlatClientProperties.MINIMUM_WIDTH:
+				c.revalidate();
+				break;
+		}
 	}
 
 	@Override
 	protected void paintSafely( Graphics g ) {
-		paintBackground( g, getComponent(), focusWidth, arc, isIntelliJTheme );
+		paintBackground( g, getComponent(), isIntelliJTheme );
 		paintPlaceholder( g, getComponent(), placeholderForeground );
-		super.paintSafely( g );
+
+		super.paintSafely( HiDPIUtils.createGraphicsTextYCorrection( (Graphics2D) g ) );
 	}
 
 	@Override
@@ -150,19 +158,20 @@ public class FlatTextFieldUI
 		// background is painted elsewhere
 	}
 
-	static void paintBackground( Graphics g, JTextComponent c, int focusWidth, int arc, boolean isIntelliJTheme ) {
-		Border border = c.getBorder();
-
+	static void paintBackground( Graphics g, JTextComponent c, boolean isIntelliJTheme ) {
 		// do not paint background if:
 		//   - not opaque and
 		//   - border is not a flat border and
 		//   - opaque was explicitly set (to false)
 		// (same behaviour as in AquaTextFieldUI)
-		if( !c.isOpaque() && !(border instanceof FlatBorder) && FlatUIUtils.hasOpaqueBeenExplicitlySet( c ) )
+		if( !c.isOpaque() && FlatUIUtils.getOutsideFlatBorder( c ) == null && FlatUIUtils.hasOpaqueBeenExplicitlySet( c ) )
 			return;
 
+		float focusWidth = FlatUIUtils.getBorderFocusWidth( c );
+		float arc = FlatUIUtils.getBorderArc( c );
+
 		// fill background if opaque to avoid garbage if user sets opaque to true
-		if( c.isOpaque() && focusWidth > 0 )
+		if( c.isOpaque() && (focusWidth > 0 || arc > 0) )
 			FlatUIUtils.paintParentBackground( g, c );
 
 		// paint background
@@ -170,16 +179,13 @@ public class FlatTextFieldUI
 		try {
 			FlatUIUtils.setRenderingHints( g2 );
 
-			float fFocusWidth = (border instanceof FlatBorder) ? scale( (float) focusWidth ) : 0;
-			float fArc = (border instanceof FlatTextBorder) ? scale( (float) arc ) : 0;
-
 			Color background = c.getBackground();
 			g2.setColor( !(background instanceof UIResource)
 				? background
 				: (isIntelliJTheme && (!c.isEnabled() || !c.isEditable())
 					? FlatUIUtils.getParentBackground( c )
 					: background) );
-			FlatUIUtils.paintComponentBackground( g2, 0, 0, c.getWidth(), c.getHeight(), fFocusWidth, fArc );
+			FlatUIUtils.paintComponentBackground( g2, 0, 0, c.getWidth(), c.getHeight(), focusWidth, arc );
 		} finally {
 			g2.dispose();
 		}
@@ -212,28 +218,29 @@ public class FlatTextFieldUI
 
 	@Override
 	public Dimension getPreferredSize( JComponent c ) {
-		return applyMinimumWidth( super.getPreferredSize( c ), c );
+		return applyMinimumWidth( c, super.getPreferredSize( c ), minimumWidth );
 	}
 
 	@Override
 	public Dimension getMinimumSize( JComponent c ) {
-		return applyMinimumWidth( super.getMinimumSize( c ), c );
+		return applyMinimumWidth( c, super.getMinimumSize( c ), minimumWidth );
 	}
 
-	private Dimension applyMinimumWidth( Dimension size, JComponent c ) {
+	static Dimension applyMinimumWidth( JComponent c, Dimension size, int minimumWidth ) {
 		// do not apply minimum width if JTextField.columns is set
 		if( c instanceof JTextField && ((JTextField)c).getColumns() > 0 )
 			return size;
 
+		// do not apply minimum width if used in combobox or spinner
 		Container parent = c.getParent();
 		if( parent instanceof JComboBox ||
 			parent instanceof JSpinner ||
 			(parent != null && parent.getParent() instanceof JSpinner) )
 		  return size;
 
-		int minimumWidth = FlatUIUtils.minimumWidth( getComponent(), this.minimumWidth );
-		int focusWidth = (c.getBorder() instanceof FlatBorder) ? this.focusWidth : 0;
-		size.width = Math.max( size.width, scale( minimumWidth + (focusWidth * 2) ) );
+		minimumWidth = FlatUIUtils.minimumWidth( c, minimumWidth );
+		float focusWidth = FlatUIUtils.getBorderFocusWidth( c );
+		size.width = Math.max( size.width, scale( minimumWidth ) + Math.round( focusWidth * 2 ) );
 		return size;
 	}
 }

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

@@ -16,9 +16,10 @@
 
 package com.formdev.flatlaf.ui;
 
-import static com.formdev.flatlaf.util.UIScale.scale;
 import java.awt.Dimension;
 import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.beans.PropertyChangeEvent;
 import javax.swing.JComponent;
 import javax.swing.JEditorPane;
 import javax.swing.UIManager;
@@ -26,6 +27,7 @@ import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicTextPaneUI;
 import javax.swing.text.JTextComponent;
+import com.formdev.flatlaf.util.HiDPIUtils;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JTextPane}.
@@ -83,24 +85,25 @@ public class FlatTextPaneUI
 		getComponent().putClientProperty( JEditorPane.HONOR_DISPLAY_PROPERTIES, oldHonorDisplayProperties );
 	}
 
+	@Override
+	protected void propertyChange( PropertyChangeEvent e ) {
+		super.propertyChange( e );
+		FlatEditorPaneUI.propertyChange( getComponent(), e );
+	}
+
 	@Override
 	public Dimension getPreferredSize( JComponent c ) {
-		return applyMinimumWidth( super.getPreferredSize( c ) );
+		return FlatEditorPaneUI.applyMinimumWidth( c, super.getPreferredSize( c ), minimumWidth );
 	}
 
 	@Override
 	public Dimension getMinimumSize( JComponent c ) {
-		return applyMinimumWidth( super.getMinimumSize( c ) );
+		return FlatEditorPaneUI.applyMinimumWidth( c, super.getMinimumSize( c ), minimumWidth );
 	}
 
-	private Dimension applyMinimumWidth( Dimension 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
-		// issues. E.g. at scale factor 1.5 the first returns 4, but the second 3.
-		int minimumWidth = FlatUIUtils.minimumWidth( getComponent(), this.minimumWidth );
-		size.width = Math.max( size.width, scale( minimumWidth ) - (scale( 1 ) * 2) );
-		return size;
+	@Override
+	protected void paintSafely( Graphics g ) {
+		super.paintSafely( HiDPIUtils.createGraphicsTextYCorrection( (Graphics2D) g ) );
 	}
 
 	@Override

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

@@ -0,0 +1,867 @@
+/*
+ * Copyright 2020 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.BorderLayout;
+import java.awt.Color;
+import java.awt.Component;
+import java.awt.Container;
+import java.awt.Dialog;
+import java.awt.Dimension;
+import java.awt.EventQueue;
+import java.awt.Frame;
+import java.awt.Graphics;
+import java.awt.GraphicsConfiguration;
+import java.awt.Image;
+import java.awt.Insets;
+import java.awt.Point;
+import java.awt.Rectangle;
+import java.awt.Window;
+import java.awt.event.ActionListener;
+import java.awt.event.ComponentEvent;
+import java.awt.event.ComponentListener;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseListener;
+import java.awt.event.MouseMotionListener;
+import java.awt.event.WindowAdapter;
+import java.awt.event.WindowEvent;
+import java.awt.geom.AffineTransform;
+import java.beans.PropertyChangeEvent;
+import java.beans.PropertyChangeListener;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+import javax.accessibility.AccessibleContext;
+import javax.swing.BorderFactory;
+import javax.swing.BoxLayout;
+import javax.swing.Icon;
+import javax.swing.ImageIcon;
+import javax.swing.JButton;
+import javax.swing.JComponent;
+import javax.swing.JLabel;
+import javax.swing.JMenuBar;
+import javax.swing.JPanel;
+import javax.swing.JRootPane;
+import javax.swing.SwingConstants;
+import javax.swing.SwingUtilities;
+import javax.swing.UIManager;
+import javax.swing.border.AbstractBorder;
+import javax.swing.border.Border;
+import com.formdev.flatlaf.FlatClientProperties;
+import com.formdev.flatlaf.FlatSystemProperties;
+import com.formdev.flatlaf.ui.JBRCustomDecorations.JBRWindowTopBorder;
+import com.formdev.flatlaf.util.ScaledImageIcon;
+import com.formdev.flatlaf.util.SystemInfo;
+import com.formdev.flatlaf.util.UIScale;
+
+/**
+ * Provides the Flat LaF title bar.
+ *
+ * @uiDefault TitlePane.background							Color
+ * @uiDefault TitlePane.inactiveBackground					Color
+ * @uiDefault TitlePane.foreground							Color
+ * @uiDefault TitlePane.inactiveForeground					Color
+ * @uiDefault TitlePane.embeddedForeground					Color
+ * @uiDefault TitlePane.borderColor							Color	optional
+ * @uiDefault TitlePane.iconSize							Dimension
+ * @uiDefault TitlePane.iconMargins							Insets
+ * @uiDefault TitlePane.titleMargins						Insets
+ * @uiDefault TitlePane.menuBarMargins						Insets
+ * @uiDefault TitlePane.menuBarEmbedded						boolean
+ * @uiDefault TitlePane.buttonMaximizedHeight				int
+ * @uiDefault TitlePane.closeIcon							Icon
+ * @uiDefault TitlePane.iconifyIcon							Icon
+ * @uiDefault TitlePane.maximizeIcon						Icon
+ * @uiDefault TitlePane.restoreIcon							Icon
+ *
+ * @author Karl Tauber
+ */
+public class FlatTitlePane
+	extends JComponent
+{
+	protected final Color activeBackground = UIManager.getColor( "TitlePane.background" );
+	protected final Color inactiveBackground = UIManager.getColor( "TitlePane.inactiveBackground" );
+	protected final Color activeForeground = UIManager.getColor( "TitlePane.foreground" );
+	protected final Color inactiveForeground = UIManager.getColor( "TitlePane.inactiveForeground" );
+	protected final Color embeddedForeground = UIManager.getColor( "TitlePane.embeddedForeground" );
+	protected final Color borderColor = UIManager.getColor( "TitlePane.borderColor" );
+
+	protected final Insets menuBarMargins = UIManager.getInsets( "TitlePane.menuBarMargins" );
+	protected final Dimension iconSize = UIManager.getDimension( "TitlePane.iconSize" );
+	protected final int buttonMaximizedHeight = UIManager.getInt( "TitlePane.buttonMaximizedHeight" );
+
+	protected final JRootPane rootPane;
+
+	protected JPanel leftPanel;
+	protected JLabel iconLabel;
+	protected JComponent menuBarPlaceholder;
+	protected JLabel titleLabel;
+	protected JPanel buttonPanel;
+	protected JButton iconifyButton;
+	protected JButton maximizeButton;
+	protected JButton restoreButton;
+	protected JButton closeButton;
+
+	protected Window window;
+
+	private final Handler handler;
+
+	public FlatTitlePane( JRootPane rootPane ) {
+		this.rootPane = rootPane;
+
+		handler = createHandler();
+		setBorder( createTitlePaneBorder() );
+
+		addSubComponents();
+		activeChanged( true );
+
+		addMouseListener( handler );
+		addMouseMotionListener( handler );
+
+		// necessary for closing window with double-click on icon
+		iconLabel.addMouseListener( handler );
+	}
+
+	protected FlatTitlePaneBorder createTitlePaneBorder() {
+		return new FlatTitlePaneBorder();
+	}
+
+	protected Handler createHandler() {
+		return new Handler();
+	}
+
+	protected void addSubComponents() {
+		leftPanel = new JPanel();
+		iconLabel = new JLabel();
+		titleLabel = new JLabel();
+		iconLabel.setBorder( new FlatEmptyBorder( UIManager.getInsets( "TitlePane.iconMargins" ) ) );
+		titleLabel.setBorder( new FlatEmptyBorder( UIManager.getInsets( "TitlePane.titleMargins" ) ) );
+
+		leftPanel.setLayout( new BoxLayout( leftPanel, BoxLayout.LINE_AXIS ) );
+		leftPanel.setOpaque( false );
+		leftPanel.add( iconLabel );
+
+		menuBarPlaceholder = new JComponent() {
+			@Override
+			public Dimension getPreferredSize() {
+				JMenuBar menuBar = rootPane.getJMenuBar();
+				return (menuBar != null && menuBar.isVisible() && isMenuBarEmbedded())
+					? FlatUIUtils.addInsets( menuBar.getPreferredSize(), UIScale.scale( menuBarMargins ) )
+					: new Dimension();
+			}
+		};
+		leftPanel.add( menuBarPlaceholder );
+
+		createButtons();
+
+		setLayout( new BorderLayout() {
+			@Override
+			public void layoutContainer( Container target ) {
+				super.layoutContainer( target );
+
+				// make left panel (with embedded menu bar) smaller if horizontal space is rare
+				// to avoid that embedded menu bar overlaps button bar
+				Insets insets = target.getInsets();
+				int width = target.getWidth() - insets.left - insets.right;
+				if( leftPanel.getWidth() + buttonPanel.getWidth() > width ) {
+					int oldWidth = leftPanel.getWidth();
+					int newWidth = Math.max( width - buttonPanel.getWidth(), 0 );
+					leftPanel.setSize( newWidth, leftPanel.getHeight() );
+					if( !getComponentOrientation().isLeftToRight() )
+						leftPanel.setLocation( leftPanel.getX() + (oldWidth - newWidth), leftPanel.getY() );
+				}
+			}
+		} );
+
+		add( leftPanel, BorderLayout.LINE_START );
+		add( titleLabel, BorderLayout.CENTER );
+		add( buttonPanel, BorderLayout.LINE_END );
+	}
+
+	protected void createButtons() {
+		iconifyButton = createButton( "TitlePane.iconifyIcon", "Iconify", e -> iconify() );
+		maximizeButton = createButton( "TitlePane.maximizeIcon", "Maximize", e -> maximize() );
+		restoreButton = createButton( "TitlePane.restoreIcon", "Restore", e -> restore() );
+		closeButton = createButton( "TitlePane.closeIcon", "Close", e -> close() );
+
+		buttonPanel = new JPanel() {
+			@Override
+			public Dimension getPreferredSize() {
+				Dimension size = super.getPreferredSize();
+				if( buttonMaximizedHeight > 0 &&
+					window instanceof Frame &&
+					(((Frame)window).getExtendedState() & Frame.MAXIMIZED_BOTH) != 0 )
+				{
+					// make title pane height smaller when frame is maximized
+					size = new Dimension( size.width, Math.min( size.height, UIScale.scale( buttonMaximizedHeight ) ) );
+				}
+				return size;
+			}
+		};
+		buttonPanel.setOpaque( false );
+		buttonPanel.setLayout( new BoxLayout( buttonPanel, BoxLayout.LINE_AXIS ) );
+		if( rootPane.getWindowDecorationStyle() == JRootPane.FRAME ) {
+			// JRootPane.FRAME works only for frames (and not for dialogs)
+			// but at this time the owner window type is unknown (not yet added)
+			// so we add the iconify/maximize/restore buttons and they are hidden
+			// later in frameStateChanged(), which is invoked from addNotify()
+
+			restoreButton.setVisible( false );
+
+			buttonPanel.add( iconifyButton );
+			buttonPanel.add( maximizeButton );
+			buttonPanel.add( restoreButton );
+		}
+		buttonPanel.add( closeButton );
+	}
+
+	protected JButton createButton( String iconKey, String accessibleName, ActionListener action ) {
+		JButton button = new JButton( UIManager.getIcon( iconKey ) );
+		button.setFocusable( false );
+		button.setContentAreaFilled( false );
+		button.setBorder( BorderFactory.createEmptyBorder() );
+		button.putClientProperty( AccessibleContext.ACCESSIBLE_NAME_PROPERTY, accessibleName );
+		button.addActionListener( action );
+		return button;
+	}
+
+	protected void activeChanged( boolean active ) {
+		boolean hasEmbeddedMenuBar = rootPane.getJMenuBar() != null && rootPane.getJMenuBar().isVisible() && isMenuBarEmbedded();
+		Color background = FlatUIUtils.nonUIResource( active ? activeBackground : inactiveBackground );
+		Color foreground = FlatUIUtils.nonUIResource( active ? activeForeground : inactiveForeground );
+		Color titleForeground = (hasEmbeddedMenuBar && active) ? FlatUIUtils.nonUIResource( embeddedForeground ) : foreground;
+
+		setBackground( background );
+		titleLabel.setForeground( titleForeground );
+		iconifyButton.setForeground( foreground );
+		maximizeButton.setForeground( foreground );
+		restoreButton.setForeground( foreground );
+		closeButton.setForeground( foreground );
+
+		titleLabel.setHorizontalAlignment( hasEmbeddedMenuBar ? SwingConstants.CENTER : SwingConstants.LEADING );
+
+		// this is necessary because hover/pressed colors are derived from background color
+		iconifyButton.setBackground( background );
+		maximizeButton.setBackground( background );
+		restoreButton.setBackground( background );
+		closeButton.setBackground( background );
+	}
+
+	protected void frameStateChanged() {
+		if( window == null || rootPane.getWindowDecorationStyle() != JRootPane.FRAME )
+			return;
+
+		if( window instanceof Frame ) {
+			Frame frame = (Frame) window;
+			boolean resizable = frame.isResizable();
+			boolean maximized = ((frame.getExtendedState() & Frame.MAXIMIZED_BOTH) != 0);
+
+			iconifyButton.setVisible( true );
+			maximizeButton.setVisible( resizable && !maximized );
+			restoreButton.setVisible( resizable && maximized );
+
+			if( maximized &&
+				rootPane.getClientProperty( "_flatlaf.maximizedBoundsUpToDate" ) == null )
+			{
+				rootPane.putClientProperty( "_flatlaf.maximizedBoundsUpToDate", null );
+
+				// In case that frame was maximized from custom code (e.g. when restoring
+				// window state on application startup), then maximized bounds is not set
+				// and the window would overlap Windows task bar.
+				// To avoid this, update maximized bounds here and if it has changed
+				// re-maximize windows so that maximized bounds are used.
+				Rectangle oldMaximizedBounds = frame.getMaximizedBounds();
+				updateMaximizedBounds();
+				Rectangle newMaximizedBounds = frame.getMaximizedBounds();
+				if( newMaximizedBounds != null && !newMaximizedBounds.equals( oldMaximizedBounds ) ) {
+					int oldExtendedState = frame.getExtendedState();
+					frame.setExtendedState( oldExtendedState & ~Frame.MAXIMIZED_BOTH );
+					frame.setExtendedState( oldExtendedState );
+				}
+			}
+		} else {
+			// hide buttons because they are only supported in frames
+			iconifyButton.setVisible( false );
+			maximizeButton.setVisible( false );
+			restoreButton.setVisible( false );
+
+			revalidate();
+			repaint();
+		}
+	}
+
+	protected void updateIcon() {
+		// get window images
+		List<Image> images = window.getIconImages();
+		if( images.isEmpty() ) {
+			// search in owners
+			for( Window owner = window.getOwner(); owner != null; owner = owner.getOwner() ) {
+				images = owner.getIconImages();
+				if( !images.isEmpty() )
+					break;
+			}
+		}
+
+		boolean hasIcon = true;
+
+		// set icon
+		if( !images.isEmpty() )
+			iconLabel.setIcon( FlatTitlePaneIcon.create( images, iconSize ) );
+		else {
+			// no icon set on window --> use default icon
+			Icon defaultIcon = UIManager.getIcon( "InternalFrame.icon" );
+			if( defaultIcon != null && (defaultIcon.getIconWidth() == 0 || defaultIcon.getIconHeight() == 0) )
+				defaultIcon = null;
+			if( defaultIcon != null ) {
+				if( defaultIcon instanceof ImageIcon )
+					defaultIcon = new ScaledImageIcon( (ImageIcon) defaultIcon, iconSize.width, iconSize.height );
+				iconLabel.setIcon( defaultIcon );
+			} else
+				hasIcon = false;
+		}
+
+		// show/hide icon
+		iconLabel.setVisible( hasIcon );
+
+		updateJBRHitTestSpotsAndTitleBarHeightLater();
+	}
+
+	@Override
+	public void addNotify() {
+		super.addNotify();
+
+		uninstallWindowListeners();
+
+		window = SwingUtilities.getWindowAncestor( this );
+		if( window != null ) {
+			frameStateChanged();
+			activeChanged( window.isActive() );
+			updateIcon();
+			titleLabel.setText( getWindowTitle() );
+			installWindowListeners();
+		}
+
+		updateJBRHitTestSpotsAndTitleBarHeightLater();
+	}
+
+	@Override
+	public void removeNotify() {
+		super.removeNotify();
+
+		uninstallWindowListeners();
+		window = null;
+	}
+
+	protected String getWindowTitle() {
+		if( window instanceof Frame )
+			return ((Frame)window).getTitle();
+		if( window instanceof Dialog )
+			return ((Dialog)window).getTitle();
+		return null;
+	}
+
+	protected void installWindowListeners() {
+		if( window == null )
+			return;
+
+		window.addPropertyChangeListener( handler );
+		window.addWindowListener( handler );
+		window.addWindowStateListener( handler );
+		window.addComponentListener( handler );
+	}
+
+	protected void uninstallWindowListeners() {
+		if( window == null )
+			return;
+
+		window.removePropertyChangeListener( handler );
+		window.removeWindowListener( handler );
+		window.removeWindowStateListener( handler );
+		window.removeComponentListener( handler );
+	}
+
+	protected boolean isMenuBarEmbedded() {
+		// not storing value of "TitlePane.menuBarEmbedded" in class to allow changing at runtime
+		return UIManager.getBoolean( "TitlePane.menuBarEmbedded" ) &&
+			FlatClientProperties.clientPropertyBoolean( rootPane, FlatClientProperties.MENU_BAR_EMBEDDED, true ) &&
+			FlatSystemProperties.getBoolean( FlatSystemProperties.MENUBAR_EMBEDDED, true );
+	}
+
+	protected Rectangle getMenuBarBounds() {
+		Insets insets = rootPane.getInsets();
+		Rectangle bounds = new Rectangle(
+			SwingUtilities.convertPoint( menuBarPlaceholder, -insets.left, -insets.top, rootPane ),
+			menuBarPlaceholder.getSize() );
+
+		// add menu bar bottom border insets to bounds so that menu bar overlaps
+		// title pane border (menu bar border is painted over title pane border)
+		Insets borderInsets = getBorder().getBorderInsets( this );
+		bounds.height += borderInsets.bottom;
+
+		return FlatUIUtils.subtractInsets( bounds, UIScale.scale( getMenuBarMargins() ) );
+	}
+
+	protected Insets getMenuBarMargins() {
+		return getComponentOrientation().isLeftToRight()
+			? menuBarMargins
+			: new Insets( menuBarMargins.top, menuBarMargins.right, menuBarMargins.bottom, menuBarMargins.left );
+	}
+
+	protected void menuBarChanged() {
+		menuBarPlaceholder.invalidate();
+
+		// necessary for the case that an embedded menu bar is made invisible
+		// and a border color is specified
+		repaint();
+
+		// update title foreground color
+		EventQueue.invokeLater( () -> {
+			activeChanged( window == null || window.isActive() );
+		} );
+	}
+
+	protected void menuBarLayouted() {
+		updateJBRHitTestSpotsAndTitleBarHeightLater();
+	}
+
+/*debug
+	@Override
+	public void paint( Graphics g ) {
+		super.paint( g );
+
+		if( debugTitleBarHeight > 0 ) {
+			g.setColor( Color.green );
+			g.drawLine( 0, debugTitleBarHeight, getWidth(), debugTitleBarHeight );
+		}
+		if( debugHitTestSpots != null ) {
+			g.setColor( Color.blue );
+			for( Rectangle r : debugHitTestSpots )
+				g.drawRect( r.x, r.y, r.width, r.height );
+		}
+	}
+debug*/
+
+	@Override
+	protected void paintComponent( Graphics g ) {
+		g.setColor( getBackground() );
+		g.fillRect( 0, 0, getWidth(), getHeight() );
+	}
+
+	protected void repaintWindowBorder() {
+		int width = rootPane.getWidth();
+		int height = rootPane.getHeight();
+		Insets insets = rootPane.getInsets();
+		rootPane.repaint( 0, 0, width, insets.top ); // top
+		rootPane.repaint( 0, 0, insets.left, height ); // left
+		rootPane.repaint( 0, height - insets.bottom, width, insets.bottom ); // bottom
+		rootPane.repaint( width - insets.right, 0, insets.right, height ); // right
+	}
+
+	/**
+	 * Iconifies the window.
+	 */
+	protected void iconify() {
+		if( window instanceof Frame ) {
+			Frame frame = (Frame) window;
+			frame.setExtendedState( frame.getExtendedState() | Frame.ICONIFIED );
+		}
+	}
+
+	/**
+	 * Maximizes the window.
+	 */
+	protected void maximize() {
+		if( !(window instanceof Frame) )
+			return;
+
+		Frame frame = (Frame) window;
+
+		updateMaximizedBounds();
+
+		// let our WindowStateListener know that the maximized bounds are up-to-date
+		rootPane.putClientProperty( "_flatlaf.maximizedBoundsUpToDate", true );
+
+		// maximize window
+		frame.setExtendedState( frame.getExtendedState() | Frame.MAXIMIZED_BOTH );
+	}
+
+	protected void updateMaximizedBounds() {
+		Frame frame = (Frame) window;
+
+		// set maximized bounds to avoid that maximized window overlaps Windows task bar
+		// (if not running in JBR and if not modified from the application)
+		Rectangle oldMaximizedBounds = frame.getMaximizedBounds();
+		if( !hasJBRCustomDecoration() &&
+			(oldMaximizedBounds == null ||
+			 Objects.equals( oldMaximizedBounds, rootPane.getClientProperty( "_flatlaf.maximizedBounds" ) )) )
+		{
+			GraphicsConfiguration gc = window.getGraphicsConfiguration();
+
+			// Screen bounds, which may be smaller than physical size on Java 9+.
+			// E.g. if running a 3840x2160 screen at 200%, screenBounds.size is 1920x1080.
+			// In Java 9+, each screen can have its own scale factor.
+			//
+			// On Java 8, which does not scale, screenBounds.size of the primary screen
+			// is identical to its physical size. But when the primary screen is scaled,
+			// then screenBounds.size of secondary screens is scaled with the scale factor
+			// of the primary screen.
+			// E.g. primary 3840x2160 screen at 150%, secondary 1920x1080 screen at 100%,
+			// then screenBounds.size is 3840x2160 on primary and 2880x1560 on secondary.
+			Rectangle screenBounds = gc.getBounds();
+
+			int maximizedX = screenBounds.x;
+			int maximizedY = screenBounds.y;
+			int maximizedWidth = screenBounds.width;
+			int maximizedHeight = screenBounds.height;
+
+			if( !isMaximizedBoundsFixed() ) {
+				// on Java 8 to 14, maximized x,y are 0,0 based on all screens in a multi-screen environment
+				maximizedX = 0;
+				maximizedY = 0;
+
+				// scale maximized screen size to get physical screen size for Java 9 to 14
+				AffineTransform defaultTransform = gc.getDefaultTransform();
+				maximizedWidth = (int) (maximizedWidth * defaultTransform.getScaleX());
+				maximizedHeight = (int) (maximizedHeight * defaultTransform.getScaleY());
+			}
+
+			// screen insets are in physical size, except for Java 15+
+			// (see https://bugs.openjdk.java.net/browse/JDK-8243925)
+			// and except for Java 8 on secondary screens where primary screen is scaled
+			Insets screenInsets = window.getToolkit().getScreenInsets( gc );
+
+			// maximized bounds are required in physical size, except for Java 15+
+			// (see https://bugs.openjdk.java.net/browse/JDK-8231564 and
+			//      https://bugs.openjdk.java.net/browse/JDK-8176359)
+			// and except for Java 8 on secondary screens where primary screen is scaled
+			Rectangle newMaximizedBounds = new Rectangle(
+				maximizedX + screenInsets.left,
+				maximizedY + screenInsets.top,
+				maximizedWidth - screenInsets.left - screenInsets.right,
+				maximizedHeight - screenInsets.top - screenInsets.bottom );
+
+			if( !Objects.equals( oldMaximizedBounds, newMaximizedBounds ) ) {
+				// change maximized bounds
+				frame.setMaximizedBounds( newMaximizedBounds );
+
+				// remember maximized bounds in client property to be able to detect
+				// whether maximized bounds are modified from the application
+				rootPane.putClientProperty( "_flatlaf.maximizedBounds", newMaximizedBounds );
+			}
+		}
+	}
+
+	/**
+	 * Frame.setMaximizedBounds() behaves different on some Java versions after issues
+	 *   https://bugs.openjdk.java.net/browse/JDK-8231564 and
+	 *   https://bugs.openjdk.java.net/browse/JDK-8176359
+	 *   (see also https://bugs.java.com/bugdatabase/view_bug.do?bug_id=8176359)
+	 * were fixed in Java 15 and backported to 11.0.8 and 13.0.4.
+	 */
+	private boolean isMaximizedBoundsFixed() {
+		return SystemInfo.isJava_15_orLater ||
+			(SystemInfo.javaVersion >= SystemInfo.toVersion( 11, 0, 8, 0 ) &&
+			 SystemInfo.javaVersion <  SystemInfo.toVersion( 12, 0, 0, 0 )) ||
+			(SystemInfo.javaVersion >= SystemInfo.toVersion( 13, 0, 4, 0 ) &&
+			 SystemInfo.javaVersion <  SystemInfo.toVersion( 14, 0, 0, 0 ));
+	}
+
+	/**
+	 * Restores the window size.
+	 */
+	protected void restore() {
+		if( window instanceof Frame ) {
+			Frame frame = (Frame) window;
+			int state = frame.getExtendedState();
+			frame.setExtendedState( ((state & Frame.ICONIFIED) != 0)
+				? (state & ~Frame.ICONIFIED)
+				: (state & ~Frame.MAXIMIZED_BOTH) );
+		}
+	}
+
+	/**
+	 * Closes the window.
+	 */
+	protected void close() {
+		if( window != null )
+			window.dispatchEvent( new WindowEvent( window, WindowEvent.WINDOW_CLOSING ) );
+	}
+
+	protected boolean hasJBRCustomDecoration() {
+		return FlatRootPaneUI.canUseJBRCustomDecorations &&
+			window != null &&
+			JBRCustomDecorations.hasCustomDecoration( window );
+	}
+
+	protected void updateJBRHitTestSpotsAndTitleBarHeightLater() {
+		EventQueue.invokeLater( () -> {
+			updateJBRHitTestSpotsAndTitleBarHeight();
+		} );
+	}
+
+	protected void updateJBRHitTestSpotsAndTitleBarHeight() {
+		if( !isDisplayable() )
+			return;
+
+		if( !hasJBRCustomDecoration() )
+			return;
+
+		List<Rectangle> hitTestSpots = new ArrayList<>();
+		if( iconLabel.isVisible() )
+			addJBRHitTestSpot( iconLabel, false, hitTestSpots );
+		addJBRHitTestSpot( buttonPanel, false, hitTestSpots );
+		addJBRHitTestSpot( menuBarPlaceholder, true, hitTestSpots );
+
+		int titleBarHeight = getHeight();
+		// slightly reduce height so that component receives mouseExit events
+		if( titleBarHeight > 0 )
+			titleBarHeight--;
+
+		JBRCustomDecorations.setHitTestSpotsAndTitleBarHeight( window, hitTestSpots, titleBarHeight );
+
+/*debug
+		debugHitTestSpots = hitTestSpots;
+		debugTitleBarHeight = titleBarHeight;
+		repaint();
+debug*/
+	}
+
+	protected void addJBRHitTestSpot( JComponent c, boolean subtractMenuBarMargins, List<Rectangle> hitTestSpots ) {
+		Dimension size = c.getSize();
+		if( size.width <= 0 || size.height <= 0 )
+			return;
+
+		Point location = SwingUtilities.convertPoint( c, 0, 0, window );
+		Rectangle r = new Rectangle( location, size );
+		if( subtractMenuBarMargins )
+			r = FlatUIUtils.subtractInsets( r, UIScale.scale( getMenuBarMargins() ) );
+		// slightly increase rectangle so that component receives mouseExit events
+		r.grow( 2, 2 );
+		hitTestSpots.add( r );
+	}
+
+/*debug
+	private List<Rectangle> debugHitTestSpots;
+	private int debugTitleBarHeight;
+debug*/
+
+	//---- class TitlePaneBorder ----------------------------------------------
+
+	protected class FlatTitlePaneBorder
+		extends AbstractBorder
+	{
+		@Override
+		public Insets getBorderInsets( Component c, Insets insets ) {
+			super.getBorderInsets( c, insets );
+
+			Border menuBarBorder = getMenuBarBorder();
+			if( menuBarBorder != null ) {
+				// if menu bar is embedded, add bottom insets of menu bar border
+				Insets menuBarInsets = menuBarBorder.getBorderInsets( c );
+				insets.bottom += menuBarInsets.bottom;
+			} else if( borderColor != null && (rootPane.getJMenuBar() == null || !rootPane.getJMenuBar().isVisible()) )
+				insets.bottom += UIScale.scale( 1 );
+
+			if( hasJBRCustomDecoration() )
+				insets = FlatUIUtils.addInsets( insets, JBRWindowTopBorder.getInstance().getBorderInsets() );
+
+			return insets;
+		}
+
+		@Override
+		public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
+			// paint bottom border
+			Border menuBarBorder = getMenuBarBorder();
+			if( menuBarBorder != null ) {
+				// if menu bar is embedded, paint menu bar border
+				menuBarBorder.paintBorder( c, g, x, y, width, height );
+			} else if( borderColor != null && (rootPane.getJMenuBar() == null || !rootPane.getJMenuBar().isVisible()) ) {
+				// paint border between title pane and content if border color is specified
+				float lineHeight = UIScale.scale( (float) 1 );
+				FlatUIUtils.paintFilledRectangle( g, borderColor, x, y + height - lineHeight, width, lineHeight );
+			}
+
+			if( hasJBRCustomDecoration() )
+				JBRWindowTopBorder.getInstance().paintBorder( c, g, x, y, width, height );
+		}
+
+		protected Border getMenuBarBorder() {
+			JMenuBar menuBar = rootPane.getJMenuBar();
+			return (menuBar != null && menuBar.isVisible() && isMenuBarEmbedded()) ? menuBar.getBorder() : null;
+		}
+	}
+
+	//---- class Handler ------------------------------------------------------
+
+	protected class Handler
+		extends WindowAdapter
+		implements PropertyChangeListener, MouseListener, MouseMotionListener, ComponentListener
+	{
+		//---- interface PropertyChangeListener ----
+
+		@Override
+		public void propertyChange( PropertyChangeEvent e ) {
+			switch( e.getPropertyName() ) {
+				case "title":
+					titleLabel.setText( getWindowTitle() );
+					break;
+
+				case "resizable":
+					if( window instanceof Frame )
+						frameStateChanged();
+					break;
+
+				case "iconImage":
+					updateIcon();
+					break;
+
+				case "componentOrientation":
+					updateJBRHitTestSpotsAndTitleBarHeightLater();
+					break;
+			}
+		}
+
+		//---- interface WindowListener ----
+
+		@Override
+		public void windowActivated( WindowEvent e ) {
+			activeChanged( true );
+			updateJBRHitTestSpotsAndTitleBarHeight();
+
+			if( hasJBRCustomDecoration() )
+				JBRWindowTopBorder.getInstance().repaintBorder( FlatTitlePane.this );
+
+			repaintWindowBorder();
+		}
+
+		@Override
+		public void windowDeactivated( WindowEvent e ) {
+			activeChanged( false );
+			updateJBRHitTestSpotsAndTitleBarHeight();
+
+			if( hasJBRCustomDecoration() )
+				JBRWindowTopBorder.getInstance().repaintBorder( FlatTitlePane.this );
+
+			repaintWindowBorder();
+		}
+
+		@Override
+		public void windowStateChanged( WindowEvent e ) {
+			frameStateChanged();
+			updateJBRHitTestSpotsAndTitleBarHeight();
+		}
+
+		//---- interface MouseListener ----
+
+		private Point dragOffset;
+
+		@Override
+		public void mouseClicked( MouseEvent e ) {
+			if( e.getClickCount() == 2 && SwingUtilities.isLeftMouseButton( e ) ) {
+				if( e.getSource() == iconLabel ) {
+					// double-click on icon closes window
+					close();
+				} else if( !hasJBRCustomDecoration() &&
+					window instanceof Frame &&
+					((Frame)window).isResizable() )
+				{
+					// maximize/restore on double-click
+					Frame frame = (Frame) window;
+					if( (frame.getExtendedState() & Frame.MAXIMIZED_BOTH) != 0 )
+						restore();
+					else
+						maximize();
+				}
+			}
+		}
+
+		@Override
+		public void mousePressed( MouseEvent e ) {
+			if( window == null )
+				return; // should newer occur
+
+			dragOffset = SwingUtilities.convertPoint( FlatTitlePane.this, e.getPoint(), window );
+		}
+
+		@Override public void mouseReleased( MouseEvent e ) {}
+		@Override public void mouseEntered( MouseEvent e ) {}
+		@Override public void mouseExited( MouseEvent e ) {}
+
+		//---- interface MouseMotionListener ----
+
+		@Override
+		public void mouseDragged( MouseEvent e ) {
+			if( window == null )
+				return; // should newer occur
+
+			if( hasJBRCustomDecoration() )
+				return; // do nothing if running in JBR
+
+			// restore window if it is maximized
+			if( window instanceof Frame ) {
+				Frame frame = (Frame) window;
+				int state = frame.getExtendedState();
+				if( (state & Frame.MAXIMIZED_BOTH) != 0 ) {
+					int maximizedWidth = window.getWidth();
+
+					// restore window size, which also moves window to pre-maximized location
+					frame.setExtendedState( state & ~Frame.MAXIMIZED_BOTH );
+
+					// fix drag offset to ensure that window remains under mouse position
+					// for the case that dragging starts in the right area of the maximized window
+					int restoredWidth = window.getWidth();
+					int center = restoredWidth / 2;
+					if( dragOffset.x > center ) {
+						// this is same/similar to what Windows 10 does
+						if( dragOffset.x > maximizedWidth - center )
+							dragOffset.x = restoredWidth - (maximizedWidth - dragOffset.x);
+						else
+							dragOffset.x = center;
+					}
+				}
+			}
+
+			// compute new window location
+			int newX = e.getXOnScreen() - dragOffset.x;
+			int newY = e.getYOnScreen() - dragOffset.y;
+
+			if( newX == window.getX() && newY == window.getY() )
+				return;
+
+			// move window
+			window.setLocation( newX, newY );
+		}
+
+		@Override public void mouseMoved( MouseEvent e ) {}
+
+		//---- interface ComponentListener ----
+
+		@Override
+		public void componentResized( ComponentEvent e ) {
+			updateJBRHitTestSpotsAndTitleBarHeightLater();
+		}
+
+		@Override
+		public void componentShown( ComponentEvent e ) {
+			// necessary for the case that the frame is maximized before it is shown
+			frameStateChanged();
+		}
+
+		@Override public void componentMoved( ComponentEvent e ) {}
+		@Override public void componentHidden( ComponentEvent e ) {}
+	}
+}

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

@@ -0,0 +1,70 @@
+/*
+ * Copyright 2020 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.Dimension;
+import java.awt.Image;
+import java.util.ArrayList;
+import java.util.List;
+import javax.swing.Icon;
+import javax.swing.ImageIcon;
+import com.formdev.flatlaf.util.MultiResolutionImageSupport;
+import com.formdev.flatlaf.util.ScaledImageIcon;
+
+/**
+ * @author Karl Tauber
+ */
+public class FlatTitlePaneIcon
+	extends ScaledImageIcon
+{
+	public static Icon create( List<Image> images, Dimension size ) {
+		// collect all images including multi-resolution variants
+		List<Image> allImages = new ArrayList<>();
+		for( Image image : images ) {
+			if( MultiResolutionImageSupport.isMultiResolutionImage( image ) )
+				allImages.addAll( MultiResolutionImageSupport.getResolutionVariants( image ) );
+			else
+				allImages.add( image );
+		}
+
+		// sort images by size
+		allImages.sort( (image1, image2) -> {
+			return image1.getWidth( null ) - image2.getWidth( null );
+		} );
+
+		// create icon
+		return new FlatTitlePaneIcon( allImages, size );
+	}
+
+	private final List<Image> images;
+
+	private FlatTitlePaneIcon( List<Image> images, Dimension size ) {
+		super( new ImageIcon( images.get( 0 ) ), size.width, size.height );
+		this.images = images;
+	}
+
+	@Override
+	protected Image getResolutionVariant( int destImageWidth, int destImageHeight ) {
+		for( Image image : images ) {
+			if( destImageWidth <= image.getWidth( null ) &&
+				destImageHeight <= image.getHeight( null ) )
+			  return image;
+		}
+
+		return images.get( images.size() - 1 );
+	}
+}

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

@@ -22,7 +22,6 @@ import java.awt.Component;
 import java.awt.Graphics;
 import java.beans.PropertyChangeEvent;
 import javax.swing.AbstractButton;
-import javax.swing.ButtonModel;
 import javax.swing.JComponent;
 import javax.swing.JToggleButton;
 import javax.swing.UIManager;
@@ -50,17 +49,17 @@ import com.formdev.flatlaf.util.UIScale;
  * @uiDefault ToggleButton.startBackground				Color	optional; if set, a gradient paint is used and ToggleButton.background is ignored
  * @uiDefault ToggleButton.endBackground				Color	optional; if set, a gradient paint is used
  * @uiDefault ToggleButton.pressedBackground			Color
- * @uiDefault ToggleButton.disabledText					Color
- * @uiDefault ToggleButton.toolbar.hoverBackground		Color
- * @uiDefault ToggleButton.toolbar.pressedBackground	Color
- *
- * <!-- FlatToggleButtonUI -->
- *
  * @uiDefault ToggleButton.selectedBackground			Color
  * @uiDefault ToggleButton.selectedForeground			Color
+ * @uiDefault ToggleButton.disabledBackground			Color	optional
+ * @uiDefault ToggleButton.disabledText					Color
  * @uiDefault ToggleButton.disabledSelectedBackground	Color
+ * @uiDefault ToggleButton.toolbar.hoverBackground		Color
+ * @uiDefault ToggleButton.toolbar.pressedBackground	Color
  * @uiDefault ToggleButton.toolbar.selectedBackground	Color
  *
+ * <!-- FlatToggleButtonUI -->
+ *
  * @uiDefault ToggleButton.tab.underlineHeight			int
  * @uiDefault ToggleButton.tab.underlineColor			Color
  * @uiDefault ToggleButton.tab.disabledUnderlineColor	Color
@@ -74,12 +73,6 @@ import com.formdev.flatlaf.util.UIScale;
 public class FlatToggleButtonUI
 	extends FlatButtonUI
 {
-	protected Color selectedBackground;
-	protected Color selectedForeground;
-	protected Color disabledSelectedBackground;
-
-	protected Color toolbarSelectedBackground;
-
 	protected int tabUnderlineHeight;
 	protected Color tabUnderlineColor;
 	protected Color tabDisabledUnderlineColor;
@@ -89,12 +82,8 @@ public class FlatToggleButtonUI
 
 	private boolean defaults_initialized = false;
 
-	private static ComponentUI instance;
-
 	public static ComponentUI createUI( JComponent c ) {
-		if( instance == null )
-			instance = new FlatToggleButtonUI();
-		return instance;
+		return FlatUIUtils.createSharedUI( FlatToggleButtonUI.class, FlatToggleButtonUI::new );
 	}
 
 	@Override
@@ -107,12 +96,6 @@ public class FlatToggleButtonUI
 		super.installDefaults( b );
 
 		if( !defaults_initialized ) {
-			selectedBackground = UIManager.getColor( "ToggleButton.selectedBackground" );
-			selectedForeground = UIManager.getColor( "ToggleButton.selectedForeground" );
-			disabledSelectedBackground = UIManager.getColor( "ToggleButton.disabledSelectedBackground" );
-
-			toolbarSelectedBackground = UIManager.getColor( "ToggleButton.toolbar.selectedBackground" );
-
 			tabUnderlineHeight = UIManager.getInt( "ToggleButton.tab.underlineHeight" );
 			tabUnderlineColor = UIManager.getColor( "ToggleButton.tab.underlineColor" );
 			tabDisabledUnderlineColor = UIManager.getColor( "ToggleButton.tab.disabledUnderlineColor" );
@@ -138,7 +121,7 @@ public class FlatToggleButtonUI
 			case BUTTON_TYPE:
 				if( BUTTON_TYPE_TAB.equals( e.getOldValue() ) || BUTTON_TYPE_TAB.equals( e.getNewValue() ) ) {
 					MigLayoutVisualPadding.uninstall( b );
-					MigLayoutVisualPadding.install( b, getFocusWidth( b ) );
+					MigLayoutVisualPadding.install( b );
 					b.revalidate();
 				}
 
@@ -184,37 +167,4 @@ public class FlatToggleButtonUI
 		} else
 			super.paintBackground( g, c );
 	}
-
-	@Override
-	protected Color getBackground( JComponent c ) {
-		ButtonModel model = ((AbstractButton)c).getModel();
-
-		if( model.isSelected() ) {
-			// in toolbar use same 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 ? toolbarPressedBackground : pressedBackground );
-		}
-
-		return super.getBackground( c );
-	}
-
-	@Override
-	protected Color getForeground( JComponent c ) {
-		ButtonModel model = ((AbstractButton)c).getModel();
-
-		if( model.isSelected() && !isToolBarButton( c ) )
-			return selectedForeground;
-
-		return super.getForeground( c );
-	}
-
-	@Override
-	protected int getFocusWidth( JComponent c ) {
-		return isTabButton( c ) ? 0 : super.getFocusWidth( c );
-	}
 }

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

@@ -16,15 +16,16 @@
 
 package com.formdev.flatlaf.ui;
 
-import static com.formdev.flatlaf.util.UIScale.*;
 import java.awt.Color;
 import java.awt.Component;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
 import java.awt.Insets;
+import java.awt.Rectangle;
 import javax.swing.JToolBar;
 import javax.swing.SwingConstants;
 import javax.swing.UIManager;
+import com.formdev.flatlaf.util.UIScale;
 
 /**
  * Border for {@link javax.swing.JToolBar}.
@@ -39,7 +40,7 @@ public class FlatToolBarBorder
 {
 	private static final int DOT_COUNT = 4;
 	private static final int DOT_SIZE = 2;
-	private static final int GRIP_WIDTH = DOT_SIZE * 3;
+	private static final int GRIP_SIZE = DOT_SIZE * 3;
 
 	protected final Color gripColor = UIManager.getColor( "ToolBar.gripColor" );
 
@@ -64,35 +65,27 @@ public class FlatToolBarBorder
 	}
 
 	protected void paintGrip( Component c, Graphics g, int x, int y, int width, int height ) {
-		int dotSize = scale( DOT_SIZE );
-		int gapSize = dotSize;
-		int gripSize = (dotSize * DOT_COUNT) + ((gapSize * (DOT_COUNT - 1)));
+		Rectangle r = calculateGripBounds( c, x, y, width, height );
+		FlatUIUtils.paintGrip( g, r.x, r.y, r.width, r.height,
+			((JToolBar)c).getOrientation() == SwingConstants.VERTICAL,
+			DOT_COUNT, DOT_SIZE, DOT_SIZE, false );
+	}
 
-		// include toolbar margin in grip position calculation
-		Insets insets = getBorderInsets( c );
+	protected Rectangle calculateGripBounds( Component c, int x, int y, int width, int height ) {
+		// include toolbar margin in grip bounds calculation
+		Insets insets = super.getBorderInsets( c, new Insets( 0, 0, 0, 0 ) );
+		Rectangle r = FlatUIUtils.subtractInsets( new Rectangle( x, y, width, height ), insets );
 
-		// calculate grip position
-		boolean horizontal = ((JToolBar)c).getOrientation() == SwingConstants.HORIZONTAL;
-		if( horizontal ) {
-			if( c.getComponentOrientation().isLeftToRight() )
-				x += insets.left - (dotSize * 2);
-			else
-				x += width - insets.right + dotSize;
-			y += Math.round( (height - gripSize) / 2f );
-		} else {
-			// vertical
-			x += Math.round( (width - gripSize) / 2f );
-			y += insets.top - (dotSize * 2);
-		}
+		// calculate grip bounds
+		int gripSize = UIScale.scale( GRIP_SIZE );
+		if( ((JToolBar)c).getOrientation() == SwingConstants.HORIZONTAL ) {
+			if( !c.getComponentOrientation().isLeftToRight() )
+				r.x = r.x + r.width - gripSize;
+			r.width = gripSize;
+		} else
+			r.height = gripSize;
 
-		// paint dots
-		for( int i = 0; i < DOT_COUNT; i++ ) {
-			g.fillOval( x, y, dotSize, dotSize );
-			if( horizontal )
-				y += dotSize + gapSize;
-			else
-				x += dotSize + gapSize;
-		}
+		return r;
 	}
 
 	@Override
@@ -101,7 +94,7 @@ public class FlatToolBarBorder
 
 		// add grip inset if floatable
 		if( c instanceof JToolBar && ((JToolBar)c).isFloatable() ) {
-			int gripInset = scale( GRIP_WIDTH );
+			int gripInset = UIScale.scale( GRIP_SIZE );
 			if( ((JToolBar)c).getOrientation() == SwingConstants.HORIZONTAL ) {
 				if( c.getComponentOrientation().isLeftToRight() )
 					insets.left += gripInset;

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

@@ -50,12 +50,8 @@ public class FlatToolBarSeparatorUI
 
 	private boolean defaults_initialized = false;
 
-	private static ComponentUI instance;
-
 	public static ComponentUI createUI( JComponent c ) {
-		if( instance == null )
-			instance = new FlatToolBarSeparatorUI();
-		return instance;
+		return FlatUIUtils.createSharedUI( FlatToolBarSeparatorUI.class, FlatToolBarSeparatorUI::new );
 	}
 
 	@Override
@@ -110,13 +106,15 @@ public class FlatToolBarSeparatorUI
 		float lineWidth = scale( 1f );
 		float offset = scale( 2f );
 
-		FlatUIUtils.setRenderingHints( (Graphics2D) g );
+		Object[] oldRenderingHints = FlatUIUtils.setRenderingHints( g );
 		g.setColor( separatorColor );
 
 		if( isVertical( c ) )
 			((Graphics2D)g).fill( new Rectangle2D.Float( Math.round( (width - lineWidth) / 2f ), offset, lineWidth, height - (offset * 2) ) );
 		else
 			((Graphics2D)g).fill( new Rectangle2D.Float( offset, Math.round( (height - lineWidth) / 2f ), width - (offset * 2), lineWidth ) );
+
+		FlatUIUtils.resetRenderingHints( g, oldRenderingHints );
 	}
 
 	private boolean isVertical( JComponent c ) {

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

@@ -27,7 +27,9 @@ import javax.swing.JComponent;
 import javax.swing.JToolTip;
 import javax.swing.SwingUtilities;
 import javax.swing.plaf.ComponentUI;
+import javax.swing.plaf.basic.BasicHTML;
 import javax.swing.plaf.basic.BasicToolTipUI;
+import com.formdev.flatlaf.util.HiDPIUtils;
 import com.formdev.flatlaf.util.StringUtils;
 
 /**
@@ -50,12 +52,8 @@ public class FlatToolTipUI
 {
 	private static PropertyChangeListener sharedPropertyChangedListener;
 
-	private static ComponentUI instance;
-
 	public static ComponentUI createUI( JComponent c ) {
-		if( instance == null )
-			instance = new FlatToolTipUI();
-		return instance;
+		return FlatUIUtils.createSharedUI( FlatToolTipUI.class, FlatToolTipUI::new );
 	}
 
 	@Override
@@ -92,6 +90,11 @@ public class FlatToolTipUI
 
 	@Override
 	public Dimension getPreferredSize( JComponent c ) {
+		// do not show tool tip if text is empty
+		String text = ((JToolTip)c).getTipText();
+		if( text == null || text.isEmpty() )
+			return new Dimension();
+
 		if( isMultiLine( c ) ) {
 			FontMetrics fm = c.getFontMetrics( c.getFont() );
 			Insets insets = c.getInsets();
@@ -102,7 +105,7 @@ public class FlatToolTipUI
 			for( String line : lines )
 				width = Math.max( width, SwingUtilities.computeStringWidth( fm, line ) );
 
-			return new Dimension( insets.left + width + insets.right, insets.top + height + insets.bottom );
+			return new Dimension( insets.left + width + insets.right + 6, insets.top + height + insets.bottom );
 		} else
 			return super.getPreferredSize( c );
 	}
@@ -113,13 +116,12 @@ public class FlatToolTipUI
 			FontMetrics fm = c.getFontMetrics( c.getFont() );
 			Insets insets = c.getInsets();
 
-			FlatUIUtils.setRenderingHints( (Graphics2D) g );
 			g.setColor( c.getForeground() );
 
 			List<String> lines = StringUtils.split( ((JToolTip)c).getTipText(), '\n' );
 
-			int x = insets.left;
-			int x2 = c.getWidth() - insets.right;
+			int x = insets.left + 3;
+			int x2 = c.getWidth() - insets.right - 3;
 			int y = insets.top - fm.getDescent();
 			int lineHeight = fm.getHeight();
 			JComponent comp = ((JToolTip)c).getComponent();
@@ -129,11 +131,11 @@ public class FlatToolTipUI
 				FlatUIUtils.drawString( c, g, line, leftToRight ? x : x2 - SwingUtilities.computeStringWidth( fm, line ), y );
 			}
 		} else
-			super.paint( g, c );
+			super.paint( HiDPIUtils.createGraphicsTextYCorrection( (Graphics2D) g ), c );
 	}
 
 	private boolean isMultiLine( JComponent c ) {
 		String text = ((JToolTip)c).getTipText();
-		return c.getClientProperty( "html" ) == null && text != null && text.indexOf( '\n' ) >= 0;
+		return c.getClientProperty( BasicHTML.propertyKey ) == null && text != null && text.indexOf( '\n' ) >= 0;
 	}
 }

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

@@ -25,6 +25,7 @@ import java.awt.event.MouseEvent;
 import java.awt.event.MouseListener;
 import java.beans.PropertyChangeEvent;
 import java.beans.PropertyChangeListener;
+import javax.swing.CellRendererPane;
 import javax.swing.JComponent;
 import javax.swing.JTree;
 import javax.swing.LookAndFeel;
@@ -75,6 +76,11 @@ import com.formdev.flatlaf.util.UIScale;
  * @uiDefault Tree.dropCellBackground				Color
  * @uiDefault Tree.dropCellForeground				Color
  *
+ * <!-- DefaultTreeCellEditor -->
+ *
+ * @uiDefault Tree.editorBorder						Border
+ * @uiDefault Tree.editorBorderSelectionColor		Color
+ *
  * <!-- FlatTreeUI -->
  *
  * @uiDefault Tree.border							Border
@@ -221,11 +227,16 @@ public class FlatTreeUI
 		TreePath path, int row, boolean isExpanded, boolean hasBeenExpanded, boolean isLeaf )
 	{
 		boolean isEditing = (editingComponent != null && editingRow == row);
-		boolean hasFocus = tree.hasFocus();
+		boolean hasFocus = FlatUIUtils.isPermanentFocusOwner( tree );
 		boolean cellHasFocus = hasFocus && (row == getLeadSelectionRow());
 		boolean isSelected = tree.isRowSelected( row );
 		boolean isDropRow = isDropRow( row );
 
+		// if tree is used as cell renderer in another component (e.g. in Rhino JavaScript debugger),
+		// check whether that component is focused to get correct selection colors
+		if( !hasFocus && isSelected && tree.getParent() instanceof CellRendererPane )
+			hasFocus = FlatUIUtils.isPermanentFocusOwner( tree.getParent().getParent() );
+
 		// wide selection background
 		if( wideSelection && (isSelected || isDropRow) ) {
 			// fill background