release 0.24

(e.g. done in NetBeans class ETableHeader)

CHANGELOG.md

@@ -1,6 +1,206 @@
 FlatLaf Change Log
 ==================
 
+## 0.24
+
+- Support smooth scrolling with touchpads and high precision mouse wheels.
+  (issue #27)
+- Changed `.properties` file loading order: Now all core `.properties` files are
+  loaded before loading addon `.properties` files. This makes it easier to
+  overwrite core values in addons. Also, addon loading order can be specified.
+- TableHeader: Paint column borders if renderer has changed, but delegates to
+  the system default renderer (e.g. done in NetBeans).
+- Label and ToolTip: Fixed font sizes for HTML headings.
+- Button and ToggleButton: Support square button style (set client property
+  `JButton.buttonType` to `square`).
+- ToggleButton: Support underline toggle button style (set client property
+  `JButton.buttonType` to `underline`).
+- Button and TextComponent: Support per component minimum width (set client
+  property `JComponent.minimumWidth` to an integer).
+- ScrollPane with Table: The border of buttons that are added to one of the four
+  scroll pane corners are now removed if the center component is a table. Also,
+  these corner buttons are made not focusable.
+- Table: Replaced `Table.showGrid` with `Table.showHorizontalLines` and
+  `Table.showVerticalLines`. (issue #38)
+- ProgressBar: Now uses blueish color for the progress part in "Flat Dark"
+  theme. In the "Flat Darcula" theme, it remains light gray.
+- Improved Swing system colors `controlHighlight`, `controlLtHighlight`,
+  `controlShadow` and `controlDkShadow`.
+
+
+## 0.23.1
+
+- Tree: Fixed wide selection if scrolled horizontally.
+- ComboBox: Fixed NPE in Oracle SQL Developer settings.
+- IntelliJ Themes: Fixed checkbox colors in Material UI Lite dark themes.
+
+
+## 0.23
+
+- Updated colors in "Flat Light" and "Flat IntelliJ" themes with colors from
+  "IntelliJ Light Theme", which provides blue coloring that better matches
+  platform colors.
+- Tree: Support wide selection (enabled by default).
+- Table: Hide grid and changed intercell spacing to zero.
+- List, Table and Tree: Added colors for drag-and-drop. Added "enable drag and
+  drop" checkbox to Demo on "Data Components" tab.
+- List and Tree: Hide cell focus indicator (black rectangle) by default. Can be
+  enabled with `List.showCellFocusIndicator=true` /
+  `Tree.showCellFocusIndicator=true`, but then the cell focus indicator is shown
+  only if more than one item is selected.
+- Table: Hide cell focus indicator (black rectangle) by default if none of the
+  selected cells is editable. Can be show always with
+  `Table.showCellFocusIndicator=true`.
+- Support basic color functions in `.properties` files: `rgb(red,green,blue)`,
+  `rgba(red,green,blue,alpha)`, `hsl(hue,saturation,lightness)`,
+  `hsla(hue,saturation,lightness,alpha)`, `lighten(color,amount[,options])` and
+  `darken(color,amount[,options])`.
+- Replaced prefix `@@` with `$` in `.properties` files.
+- Fixed link color (in HTML text) and separator color in IntelliJ platform
+  themes.
+- Use logging instead of printing errors to `System.err`.
+- Updated IntelliJ Themes in demo to the latest versions.
+- IntelliJ Themes: Fixed link and separator colors.
+
+
+## 0.22
+
+- TextComponent: Support placeholder text that is displayed if text field is
+  empty (set client property "JTextField.placeholderText" to a string).
+- TextComponent: Scale caret width on HiDPI screens when running on Java 8.
+- ProgressBar: If progress text is visible:
+  - use smaller font
+  - reduced height
+  - changed style to rounded rectangle
+  - fixed painting issues on low values
+- ProgressBar: Support configure of arc with `ProgressBar.arc`.
+- ProgressBar: Reduced thickness from 6 to 4.
+- TabbedPane: Support background color for selected tabs
+  (`TabbedPane.selectedBackground`) and separators between tabs
+  (`TabbedPane.showTabSeparators`).
+- CheckBox: changed `CheckBox.arc` from radius to diameter to be consistent with
+  `Button.arc` and `Component.arc`
+- Button: Enabled `Button.defaultButtonFollowsFocus` on Windows, which allows
+  pressing focused button with <kbd>Enter</kbd> key (as in Windows LaF).
+- Fixed clipped borders at 125%, 150% and 175% scaling when outer focus width is
+  zero (default in "Flat Light" and "Flat Dark" themes).
+- On Mac show mnemonics only when <kbd>Ctrl</kbd> and <kbd>Alt</kbd> keys are
+  pressed. (issue #4)
+
+
+## 0.21
+
+- ScrollBar: Show decrease/increase arrow buttons if client property
+  "JScrollBar.showButtons" is set to `true` on `JScrollPane` or `JScrollBar`.
+  (issue #25)
+- `FlatLaf.isNativeLookAndFeel()` now returns `false`.
+- Button: Optionally support gradient borders, gradient backgrounds and shadows
+  for improved compatibility with IntelliJ platform themes (e.g. for Vuesion,
+  Spacegray and Material Design Dark themes).
+- Button: Fixed help button styling in IntelliJ platform themes.
+- ScrollPane: Paint disabled border if view component (e.g. JTextPane) is
+  disabled.
+- Fixed Swing system colors in dark themes.
+
+
+## 0.20
+
+- Support using IntelliJ platform themes (.theme.json files).
+- Support `JFileChooser`. (issue #5)
+- Look and feel identifier returned by `FlatLaf.getID()` now always starts with
+  "FlatLaf". Use `UIManager.getLookAndFeel().getID().startsWith( "FlatLaf" )` to
+  check whether the current look and feel is FlatLaf.
+- Fixed selection background of checkbox in table cell.
+- Fixed color of links in HTML text.
+- Fixed jittery submenu rendering on Mac. (issue #10)
+- Fixed "cannot find symbol" error in NetBeans editor, when source/binary format
+  is set to JDK 9 (or later) in NetBeans project. (issue #13)
+- Button: Make button square if button text is "..." or a single character.
+- ComboBox: Fixed issues with NetBeans `org.openide.awt.ColorComboBox`
+  component.
+- Hex color values in `.properties` files now must start with a `#` character.
+- SwingX: Support `JXTitledPanel`. (issue #22)
+- SwingX: Fixed too wide border when using date picker as table cell editor.
+  (issue #24)
+- JIDE Common Layer: Fixed `JidePopup` border.
+
+
+## 0.18
+
+- TextField and TextArea: Do not apply minimum width if `columns` property is
+  greater than zero.
+- TabbedPane: In scroll-tab-layout, the separator line now spans the whole width
+  and is no longer interrupted by the scroll buttons.
+- TabbedPane: Content pane is no longer opaque. Use antialiasing for painting
+  separator and content border.
+- ToolTip: Use anti-aliasing to render multi-line tooltips.
+- JIDE Common Layer: Support `JideTabbedPane`.
+
+
+## 0.17
+
+- CheckBox: Support painting a third state (set client property
+  "JButton.selectedState" to "indeterminate").
+- `TriStateCheckBox` component added (see [FlatLaf Extras](flatlaf-extras)).
+- Made `JComboBox`, `JProgressBar`, `JSpinner` and `JXDatePicker` non-opaque.
+  `JPasswordField`, `JScrollPane` and `JTextField` are non-opaque if they have
+  an outside focus border (e.g. IntelliJ and Darcula themes). (issues #20 and
+  #17)
+- Button: Hover and pressed background colors are now derived from actual button
+  background color. (issue #21)
+- Table: Fixed missing upper right corner (e.g. in SwingX JXTable with column
+  control visible).
+
+
+## 0.16
+
+- Made some fixes for right-to-left support in ComboBox, Slider and ToolTip.
+  (issue #18)
+- Fixed Java 9 module descriptor (broken since 0.14).
+- Made `JButton`, `JCheckBox`, `JRadioButton`, `JToggleButton` and `JSlider`
+  non-opaque. (issue #20)
+
+
+## 0.15
+
+- ToolTip: Improved styling of dark tooltips (darker background, no border).
+- ToolTip: Fixed colors in tooltips of disabled components. (issue #15)
+- ComboBox: Fixed NPE in combobox with custom renderer after switching to
+  FlatLaf. (issue #16; regression in 0.14)
+
+
+## 0.14
+
+- ComboBox: Use small border if used as table editor.
+- ToolBar: Disable focusability of buttons in toolbar.
+- OptionPane: Fixed rendering of longer HTML text. (issue #12)
+- EditorPane and TextPane: Fixed font and text color when using HTML content.
+  (issue #9)
+- ComboBox: Fixed `StackOverflowError` when switching LaF. (issue #14)
+- SwingX: Support `JXBusyLabel`, `JXDatePicker`, `JXHeader`, `JXHyperlink`,
+  `JXMonthView`, `JXTaskPaneContainer` and `JXTaskPane`. (issue #8)
+
+
+## 0.13
+
+- Added developer information to Maven POM for Maven Central publishing.
+
+
+## 0.12
+
+- Support Linux. (issue #2)
+- Added `Flat*Laf.install()` methods.
+- macOS: Use native screen menu bar if system property
+  `apple.laf.useScreenMenuBar` is `true`.
+- Windows: Update fonts (and scaling) when user changes Windows text size
+  (Settings > Ease of Access > Display > Make text bigger).
+
+
+## 0.11
+
+- Changed Maven groupId to `com.formdev` and artifactId to `flatlaf`.
+
+
 ## 0.10
 
 - Use new chevron arrows in "Flat Light" and "Flat Dark" themes, but keep

README.md

@@ -1,44 +1,66 @@
 FlatLaf - Flat Look and Feel
 ============================
 
-**FlatLaf** is a modern open-source cross-platform Look and Feel for Java
-desktop applications.
+**FlatLaf** is a modern **open-source** cross-platform Look and Feel for Java
+Swing desktop applications.
 
-It looks mostly "flat" (no shadows or gradients), clean, simple and elegant.
+It looks almost flat (no shadows or gradients), clean, simple and elegant.
 FlatLaf comes with **Light**, **Dark**, **IntelliJ** and **Darcula** themes,
 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 mostly the same colors and icons.
+IntelliJ IDEA 2019.2+ and uses almost the same colors and icons.
 
 ![Flat Light Demo](images/FlatLightDemo.png)
 
 ![Flat Dark Demo](images/FlatDarkDemo.png)
 
 
+IntelliJ Platform Themes
+------------------------
+
+FlatLaf can use 3rd party themes created for IntelliJ Platform:
+
+![Cyan Light Demo](images/CyanLightDemo.png)
+
+![Dark Purple Demo](images/DarkPurpleDemo.png)
+
+
 Demo
 ----
 
-Download
-[flatlaf-demo-0.10.jar](https://download.formdev.com/flatlaf/flatlaf-demo-0.10.jar)
-and run it with `java -jar flatlaf-demo-0.10.jar` (or double-click it). Requires
-Java 8 or newer.
+[![Download Demo](https://download.formdev.com/flatlaf/images/download-demo.svg)](https://download.formdev.com/flatlaf/flatlaf-demo-latest.jar)
+
+Run demo with `java -jar flatlaf-demo-<version>.jar` (or double-click it).
+Requires Java 8 or newer.
 
 
 Download
 --------
 
-[ ![Download](https://api.bintray.com/packages/jformdesigner/flatlaf/flatlaf-core/images/download.svg) ](https://bintray.com/jformdesigner/flatlaf/flatlaf-core/_latestVersion)
+FlatLaf binaries are available on **JCenter** and **Maven Central**.
 
-For Maven or Gradle use:
+If you use Maven or Gradle, add a dependency with following coordinates to your
+build script:
 
-    Repository:   jcenter (https://jcenter.bintray.com/) 
-    Group Id:     com.formdev.flatlaf
-    Artifact Id:  flatlaf-core
-    Version:      0.10
+    groupId:     com.formdev
+    artifactId:  flatlaf
+    version:     0.24
+
+Otherwise download `flatlaf-<version>.jar` here:
+
+[![Download](https://api.bintray.com/packages/jformdesigner/flatlaf/flatlaf/images/download.svg)](https://bintray.com/jformdesigner/flatlaf/flatlaf/_latestVersion)
 
 
-License
--------
+Addons
+------
 
-FlatLaf is open source licensed under the [Apache 2.0 License](LICENSE)
+- [SwingX](flatlaf-swingx)
+- [JIDE Common Layer](flatlaf-jide-oss)
+
+
+Documentation
+-------------
+
+For more information and documentation visit
+[FlatLaf Home](https://www.formdev.com/flatlaf/)

build.gradle.kts

@@ -14,7 +14,13 @@
  * limitations under the License.
  */
 
-version = "0.10"
+version = "0.24"
+
+allprojects {
+	repositories {
+		jcenter()
+	}
+}
 
 // check required Java version
 if( JavaVersion.current() < JavaVersion.VERSION_1_8 )

flatlaf-core/README.md

@@ -0,0 +1,4 @@
+FlatLaf Core
+============
+
+This sub-project contains the FlatLaf core source code.

flatlaf-core/build.gradle.kts

@@ -22,10 +22,6 @@ plugins {
 	id( "com.jfrog.bintray" ) version "1.8.4"
 }
 
-repositories {
-	jcenter()
-}
-
 if( JavaVersion.current() >= JavaVersion.VERSION_1_9 ) {
 	sourceSets {
 		create( "module-info" ) {
@@ -38,17 +34,19 @@ if( JavaVersion.current() >= JavaVersion.VERSION_1_9 ) {
 	}
 }
 
-dependencies {
-	testImplementation( "com.miglayout:miglayout-swing:5.2" )
-	testImplementation( "com.jgoodies:jgoodies-forms:1.9.0" )
-}
-
 java {
-    sourceCompatibility = JavaVersion.VERSION_1_8
-    targetCompatibility = JavaVersion.VERSION_1_8
+	sourceCompatibility = JavaVersion.VERSION_1_8
+	targetCompatibility = JavaVersion.VERSION_1_8
 }
 
 tasks {
+	assemble {
+		dependsOn(
+			"sourcesJar",
+			"javadocJar"
+		)
+	}
+
 	if( JavaVersion.current() >= JavaVersion.VERSION_1_9 ) {
 		named<JavaCompile>( "compileModuleInfoJava" ) {
 			sourceCompatibility = "9"
@@ -60,12 +58,7 @@ tasks {
 		archiveBaseName.set( "flatlaf" )
 
 		if( JavaVersion.current() >= JavaVersion.VERSION_1_9 ) {
-			manifest.attributes(
-				"Multi-Release" to "true"
-			)
-
-			into( "META-INF/versions/9" ) {
-				from( sourceSets["module-info"].output )
+			from( sourceSets["module-info"].output ) {
 				include( "module-info.class" )
 			}
 		}
@@ -97,8 +90,8 @@ tasks {
 publishing {
 	publications {
 		create<MavenPublication>( "maven" ) {
-			artifactId = "flatlaf-core"
-			groupId = "com.formdev.flatlaf"
+			artifactId = "flatlaf"
+			groupId = "com.formdev"
 
 			from( components["java"] )
 
@@ -117,6 +110,14 @@ publishing {
 					}
 				}
 
+				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" )
 				}
@@ -133,7 +134,7 @@ bintray {
 
 	with( pkg ) {
 		repo = "flatlaf"
-		name = "flatlaf-core"
+		name = "flatlaf"
 		setLicenses( "Apache-2.0" )
 		vcsUrl = "https://github.com/JFormDesigner/FlatLaf"
 

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

@@ -24,13 +24,111 @@ import javax.swing.JComponent;
  */
 public interface FlatClientProperties
 {
+	/**
+	 * 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}
+	 */
 	String BUTTON_TYPE = "JButton.buttonType";
+
+	/**
+	 * Paint the button with square edges.
+	 * <p>
+	 * <strong>Components</strong> {@link javax.swing.JButton} and {@link javax.swing.JToggleButton}
+	 *
+	 * @see #BUTTON_TYPE
+	 */
+	String BUTTON_TYPE_SQUARE = "square";
+
+	/**
+	 * Paint the toggle button in underline style.
+	 * <p>
+	 * <strong>Components</strong> {@link javax.swing.JToggleButton}
+	 *
+	 * @see #TOGGLE_BUTTON_TYPE
+	 */
+	String BUTTON_TYPE_UNDERLINE = "underline";
+
+	/**
+	 * Paint a help button (circle with question mark).
+	 * <p>
+	 * <strong>Components</strong> {@link javax.swing.JButton}
+	 *
+	 * @see #BUTTON_TYPE
+	 */
 	String BUTTON_TYPE_HELP = "help";
 
+	/**
+	 * Specifies selected state of a checkbox.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JCheckBox}<br>
+	 * <strong>Value type</strong> {@link java.lang.String}<br>
+	 * <strong>Allowed Values</strong> {@link #SELECTED_STATE_INDETERMINATE}
+	 */
+	String SELECTED_STATE = "JButton.selectedState";
+
+	/**
+	 * Paint an indeterminate state on a checkbox.
+	 *
+	 * @see #SELECTED_STATE
+	 */
+	String SELECTED_STATE_INDETERMINATE = "indeterminate";
+
+	/**
+	 * Specifies minimum width of a component.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JButton} and  {@link javax.swing.text.JTextComponent}<br>
+	 * <strong>Value type</strong> {@link java.lang.Integer}<br>
+	 */
+	String MINIMUM_WIDTH = "JComponent.minimumWidth";
+
+	/**
+	 * Specifies whether the decrease/increase arrow buttons of a scrollbar are shown.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JScrollBar} or {@link javax.swing.JScrollPane}<br>
+	 * <strong>Value type</strong> {@link java.lang.Boolean}
+	 */
+	String SCROLL_BAR_SHOW_BUTTONS = "JScrollBar.showButtons";
+
+	/**
+	 * Specifies whether separators are shown between tabs.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JTabbedPane}<br>
+	 * <strong>Value type</strong> {@link java.lang.Boolean}
+	 */
+	String TABBED_PANE_SHOW_TAB_SEPARATORS = "JTabbedPane.showTabSeparators";
+
+	/**
+	 * Specifies whether a full border is painted around a tabbed pane.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JTabbedPane}<br>
+	 * <strong>Value type</strong> {@link java.lang.Boolean}
+	 */
+	String TABBED_PANE_HAS_FULL_BORDER = "JTabbedPane.hasFullBorder";
+
+	/**
+	 * Placeholder text that is only painted if the text field is empty.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JTextField} or {@link javax.swing.JComboBox}<br>
+	 * <strong>Value type</strong> {@link java.lang.String}
+	 */
+	String PLACEHOLDER_TEXT = "JTextField.placeholderText";
+
 	/**
 	 * Checks whether a client property of a component has the given value.
 	 */
 	static boolean clientPropertyEquals( JComponent c, String key, Object value ) {
 		return Objects.equals( c.getClientProperty( key ), value );
 	}
+
+	/**
+	 * Checks whether a client property of a component is a boolean and returns its value.
+	 * If the client property is not set, or not a boolean, defaultValue is returned.
+	 */
+	static boolean clientPropertyBoolean( JComponent c, String key, boolean defaultValue ) {
+		Object value = c.getClientProperty( key );
+		return (value instanceof Boolean) ? (boolean) value : defaultValue;
+	}
 }

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

@@ -19,11 +19,17 @@ 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
+ *
  * @author Karl Tauber
  */
 public class FlatDarculaLaf
 	extends FlatDarkLaf
 {
+	public static boolean install( ) {
+		return install( new FlatDarculaLaf() );
+	}
+
 	@Override
 	public String getName() {
 		return "Flat Darcula";

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

@@ -19,11 +19,17 @@ package com.formdev.flatlaf;
 /**
  * A Flat LaF that has a dark color scheme.
  *
+ * The UI defaults are loaded from FlatDarkLaf.properties and FlatLaf.properties
+ *
  * @author Karl Tauber
  */
 public class FlatDarkLaf
 	extends FlatLaf
 {
+	public static boolean install( ) {
+		return install( new FlatDarkLaf() );
+	}
+
 	@Override
 	public String getName() {
 		return "Flat Dark";
@@ -33,4 +39,9 @@ public class FlatDarkLaf
 	public String getDescription() {
 		return "Flat Dark Look and Feel";
 	}
+
+	@Override
+	public boolean isDark() {
+		return true;
+	}
 }

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

@@ -0,0 +1,62 @@
+/*
+ * Copyright 2019 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
+ *
+ *     http://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.InputStream;
+
+/**
+ * Addon for FlatLaf UI defaults.
+ *
+ * Allows loading of additional .properties files from addon JARs.
+ * {@link java.util.ServiceLoader} is used to load extensions of this class from addon JARs.
+ * <p>
+ * If you extend this class in a addon JAR, you also have to add a text file named
+ * {@code META-INF/services/com.formdev.flatlaf.FlatDefaultsAddon}
+ * to the addon JAR. The file must contain a single line with the class name.
+ * <p>
+ * See 'flatlaf-swingx' addon for an example
+ *
+ * @author Karl Tauber
+ */
+public abstract class FlatDefaultsAddon
+{
+	/**
+	 * Finds an addon .properties file for the given LaF class and returns
+	 * it as input stream. Or {@code null} if not found.
+	 * <p>
+	 * This default implementation finds addon .properties file for the given LaF class
+	 * in the same package as the subclass.
+	 * <p>
+	 * Override this method to load addon .properties files from other locations.
+	 */
+	public InputStream getDefaults( Class<?> lafClass ) {
+		Class<?> addonClass = this.getClass();
+		String propertiesName = '/' + addonClass.getPackage().getName().replace( '.', '/' )
+			+ '/' + lafClass.getSimpleName() + ".properties";
+		return addonClass.getResourceAsStream( propertiesName );
+	}
+
+	/**
+	 * Returns the priority used to sort addon loading.
+	 * The order is only important if you want overwrite UI defaults of other addons.
+	 * Lower numbers mean higher priority.
+	 * Returns 10000 by default.
+	 */
+	public int getPriority() {
+		return 10000;
+	}
+}

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

@@ -19,11 +19,17 @@ 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
+ *
  * @author Karl Tauber
  */
 public class FlatIntelliJLaf
 	extends FlatLightLaf
 {
+	public static boolean install( ) {
+		return install( new FlatIntelliJLaf() );
+	}
+
 	@Override
 	public String getName() {
 		return "Flat IntelliJ";

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

@@ -16,42 +16,36 @@
 
 package com.formdev.flatlaf;
 
-import java.awt.AWTEvent;
 import java.awt.Color;
 import java.awt.Component;
 import java.awt.Container;
-import java.awt.Dimension;
+import java.awt.EventQueue;
 import java.awt.Font;
-import java.awt.Insets;
+import java.awt.KeyEventPostProcessor;
 import java.awt.KeyboardFocusManager;
 import java.awt.Toolkit;
 import java.awt.Window;
-import java.awt.event.AWTEventListener;
 import java.awt.event.KeyEvent;
-import java.io.IOException;
-import java.io.InputStream;
-import java.util.ArrayList;
-import java.util.HashMap;
+import java.beans.PropertyChangeEvent;
+import java.beans.PropertyChangeListener;
 import java.util.List;
-import java.util.Map;
-import java.util.Properties;
-import java.util.function.Function;
+import java.util.function.Consumer;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 import javax.swing.AbstractButton;
 import javax.swing.JLabel;
 import javax.swing.JTabbedPane;
+import javax.swing.LookAndFeel;
+import javax.swing.PopupFactory;
 import javax.swing.SwingUtilities;
 import javax.swing.UIDefaults;
 import javax.swing.UIManager;
-import javax.swing.UIDefaults.LazyValue;
+import javax.swing.UnsupportedLookAndFeelException;
 import javax.swing.plaf.ColorUIResource;
-import javax.swing.plaf.DimensionUIResource;
 import javax.swing.plaf.FontUIResource;
-import javax.swing.plaf.InsetsUIResource;
 import javax.swing.plaf.basic.BasicLookAndFeel;
 import javax.swing.plaf.metal.MetalLookAndFeel;
-import com.formdev.flatlaf.ui.FlatEmptyBorder;
-import com.formdev.flatlaf.ui.FlatLineBorder;
-import com.formdev.flatlaf.util.ScaledNumber;
+import javax.swing.text.html.HTMLEditorKit;
 import com.formdev.flatlaf.util.SystemInfo;
 import com.formdev.flatlaf.util.UIScale;
 
@@ -63,24 +57,46 @@ import com.formdev.flatlaf.util.UIScale;
 public abstract class FlatLaf
 	extends BasicLookAndFeel
 {
-	private static final String VARIABLE_PREFIX = "@";
-	private static final String REF_PREFIX = VARIABLE_PREFIX + "@";
-	private static final String OPTIONAL_PREFIX = "?";
-	private static final String GLOBAL_PREFIX = "*.";
+	static final Logger LOG = Logger.getLogger( FlatLaf.class.getName() );
 
 	private BasicLookAndFeel base;
 
-	private AWTEventListener mnemonicListener;
-	private static boolean altKeyPressed;
+	private String desktopPropertyName;
+	private PropertyChangeListener desktopPropertyListener;
 
+	private KeyEventPostProcessor mnemonicListener;
+	private static boolean showMnemonics;
+
+	private Consumer<UIDefaults> postInitialization;
+
+	public static boolean install( LookAndFeel newLookAndFeel ) {
+		try {
+			UIManager.setLookAndFeel( newLookAndFeel );
+			return true;
+		} catch( Exception ex ) {
+			LOG.log( Level.SEVERE, "FlatLaf: Failed to initialize look and feel '" + newLookAndFeel.getClass().getName() + "'.", ex );
+			return false;
+		}
+	}
+
+	/**
+	 * Returns the look and feel identifier.
+	 * <p>
+	 * Syntax: "FlatLaf - ${theme-name}"
+	 * <p>
+	 * Use {@code UIManager.getLookAndFeel().getID().startsWith( "FlatLaf" )}
+	 * to check whether the current look and feel is FlatLaf.
+	 */
 	@Override
 	public String getID() {
-		return getName();
+		return "FlatLaf - " + getName();
 	}
 
+	public abstract boolean isDark();
+
 	@Override
 	public boolean isNativeLookAndFeel() {
-		return true;
+		return false;
 	}
 
 	@Override
@@ -94,22 +110,68 @@ public abstract class FlatLaf
 
 		super.initialize();
 
+		// make sure that a plain popup factory is used (otherwise sub-menu rendering
+		// is "jittery" on Mac, where AquaLookAndFeel installs its own popup factory)
+		if( PopupFactory.getSharedInstance().getClass() != PopupFactory.class )
+			PopupFactory.setSharedInstance( new PopupFactory() );
+
 		// add mnemonic listener
 		mnemonicListener = e -> {
-			if( e instanceof KeyEvent && ((KeyEvent)e).getKeyCode() == KeyEvent.VK_ALT )
-				altKeyChanged( e.getID() == KeyEvent.KEY_PRESSED );
+			checkShowMnemonics( e );
+			return false;
+		};
+		KeyboardFocusManager.getCurrentKeyboardFocusManager().addKeyEventPostProcessor( mnemonicListener );
+
+		// listen to desktop property changes to update UI if system font or scaling changes
+		if( SystemInfo.IS_WINDOWS ) {
+			// 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 ) {
+			// 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";
+		}
+		if( desktopPropertyName != null ) {
+			desktopPropertyListener = e -> {
+				reSetLookAndFeel();
+			};
+			Toolkit.getDefaultToolkit().addPropertyChangeListener( desktopPropertyName, desktopPropertyListener );
+		}
+
+		// Following code should be ideally in initialize(), but needs color from UI defaults.
+		// Do not move this code to getDefaults() to avoid side effects in the case that
+		// getDefaults() is directly invoked from 3rd party code. E.g. `new FlatLightLaf().getDefaults()`.
+		postInitialization = defaults -> {
+			// update link color in HTML text
+			Color linkColor = defaults.getColor( "Component.linkColor" );
+			if( linkColor != null ) {
+				new HTMLEditorKit().getStyleSheet().addRule(
+					String.format( "a { color: #%06x; }", linkColor.getRGB() & 0xffffff ) );
+			}
 		};
-		Toolkit.getDefaultToolkit().addAWTEventListener( mnemonicListener, AWTEvent.KEY_EVENT_MASK );
 	}
 
 	@Override
 	public void uninitialize() {
+		// remove desktop property listener
+		if( desktopPropertyListener != null ) {
+			Toolkit.getDefaultToolkit().removePropertyChangeListener( desktopPropertyName, desktopPropertyListener );
+			desktopPropertyName = null;
+			desktopPropertyListener = null;
+		}
+
 		// remove mnemonic listener
 		if( mnemonicListener != null ) {
-			Toolkit.getDefaultToolkit().removeAWTEventListener( mnemonicListener );
+			KeyboardFocusManager.getCurrentKeyboardFocusManager().removeKeyEventPostProcessor( mnemonicListener );
 			mnemonicListener = null;
 		}
 
+		// restore default link color
+		new HTMLEditorKit().getStyleSheet().addRule( "a { color: blue; }" );
+		postInitialization = null;
+
 		if( base != null )
 			base.uninitialize();
 
@@ -124,10 +186,11 @@ public abstract class FlatLaf
 		if( base == null ) {
 			if( SystemInfo.IS_MAC ) {
 				// use Mac Aqua LaF as base
+				String aquaLafClassName = "com.apple.laf.AquaLookAndFeel";
 				try {
-					base = (BasicLookAndFeel) Class.forName( "com.apple.laf.AquaLookAndFeel" ).newInstance();
+					base = (BasicLookAndFeel) Class.forName( aquaLafClassName ).newInstance();
 				} catch( Exception ex ) {
-					ex.printStackTrace();
+					LOG.log( Level.SEVERE, "FlatLaf: Failed to initialize base look and feel '" + aquaLafClassName + "'.", ex );
 					throw new IllegalStateException();
 				}
 			} else
@@ -140,6 +203,9 @@ public abstract class FlatLaf
 	public UIDefaults getDefaults() {
 		UIDefaults defaults = getBase().getDefaults();
 
+		// add Metal resource bundle, which is required for FlatFileChooserUI
+		defaults.addResourceBundle( "com.sun.swing.internal.plaf.metal.resources.metal" );
+
 		// initialize some defaults (for overriding) that are used in basic UI delegates,
 		// but are not set in MetalLookAndFeel or BasicLookAndFeel
 		Color control = defaults.getColor( "control" );
@@ -157,12 +223,40 @@ public abstract class FlatLaf
 		defaults.put( "Spinner.disabledBackground", control );
 		defaults.put( "Spinner.disabledForeground", control );
 
+		// remember MenuBarUI from Mac Aqua LaF if Mac screen menubar is enabled
+		boolean useScreenMenuBar = SystemInfo.IS_MAC && "true".equals( System.getProperty( "apple.laf.useScreenMenuBar" ) );
+		Object aquaMenuBarUI = useScreenMenuBar ? defaults.get( "MenuBarUI" ) : null;
+
 		initFonts( defaults );
-		loadDefaultsFromProperties( defaults );
+		initIconColors( defaults, isDark() );
+
+		// load defaults from properties
+		List<Class<?>> lafClassesForDefaultsLoading = getLafClassesForDefaultsLoading();
+		if( lafClassesForDefaultsLoading != null )
+			UIDefaultsLoader.loadDefaultsFromProperties( lafClassesForDefaultsLoading, defaults );
+		else
+			UIDefaultsLoader.loadDefaultsFromProperties( getClass(), defaults );
+
+		// use Aqua MenuBarUI if Mac screen menubar is enabled
+		if( useScreenMenuBar )
+			defaults.put( "MenuBarUI", aquaMenuBarUI );
+
+		invokePostInitialization( defaults );
 
 		return defaults;
 	}
 
+	void invokePostInitialization( UIDefaults defaults ) {
+		if( postInitialization != null ) {
+			postInitialization.accept( defaults );
+			postInitialization = null;
+		}
+	}
+
+	List<Class<?>> getLafClassesForDefaultsLoading() {
+		return null;
+	}
+
 	private void initFonts( UIDefaults defaults ) {
 		FontUIResource uiFont = null;
 
@@ -182,7 +276,8 @@ public abstract class FlatLaf
 			uiFont = (font instanceof FontUIResource) ? (FontUIResource) font : new FontUIResource( font );
 
 		} else if( SystemInfo.IS_LINUX ) {
-			System.err.println( "WARNING: FlatLaf is not yet tested on Linux!" );
+			Font font = LinuxFontPolicy.getFont();
+			uiFont = (font instanceof FontUIResource) ? (FontUIResource) font : new FontUIResource( font );
 		}
 
 		if( uiFont == null )
@@ -196,277 +291,101 @@ public abstract class FlatLaf
 				defaults.put( key, uiFont );
 		}
 		defaults.put( "MenuItem.acceleratorFont", uiFont );
+
+		// use smaller font for progress bar
+		defaults.put( "ProgressBar.font", UIScale.scaleFont( uiFont, 0.85f ) );
 	}
 
 	/**
-	 * Load properties associated to Flat LaF classes and add to UI defaults.
-	 *
-	 * Each class that extend this class may have its own .properties file
-	 * in the same package as the class. Properties from superclasses are loaded
-	 * first to give subclasses a chance to override defaults.
-	 * E.g. if running FlatDarkLaf, then the FlatLaf.properties is loaded first
-	 * and FlatDarkLaf.properties loaded second.
+	 * Adds the default color palette for action icons and object icons to the given UIDefaults.
+	 * <p>
+	 * This method is public and static to allow using the color palette with
+	 * other LaFs (e.g. Windows LaF). To do so invoke:
+	 *   {@code FlatLaf.initIconColors( UIManager.getLookAndFeelDefaults(), false );}
+	 * after
+	 *   {@code UIManager.setLookAndFeel( ... );}.
+	 * <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>
 	 */
-	private void loadDefaultsFromProperties( UIDefaults defaults ) {
-		// determine classes in class hierarchy in reverse order
-		ArrayList<Class<?>> lafClasses = new ArrayList<>();
-		for( Class<?> lafClass = getClass();
-			FlatLaf.class.isAssignableFrom( lafClass );
-			lafClass = lafClass.getSuperclass() )
-		{
-			lafClasses.add( 0, lafClass );
-		}
+	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 ) );
 
-		try {
-			// load properties files
-			Properties properties = new Properties();
-			for( Class<?> lafClass : lafClasses ) {
-				String propertiesName = "/" + lafClass.getName().replace( '.', '/' ) + ".properties";
-				try( InputStream in = lafClass.getResourceAsStream( propertiesName ) ) {
-					if( in != null )
-						properties.load( in );
-				}
-			}
-
-			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() ) {
-				String key = (String) e.getKey();
-				if( !key.startsWith( GLOBAL_PREFIX ) )
-					continue;
-
-				String value = resolveValue( properties, (String) e.getValue() );
-				globals.put( key.substring( GLOBAL_PREFIX.length() ), parseValue( key, value, resolver ) );
-			}
-
-			// 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 );
-				}
-			}
-
-			// add non-global 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 ) )
-					continue;
-
-				String value = resolveValue( properties, (String) e.getValue() );
-				defaults.put( key, parseValue( key, value, resolver ) );
-			}
-		} catch( IOException ex ) {
-			ex.printStackTrace();
-		}
+		// 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 ) );
 	}
 
-	private String resolveValue( Properties properties, String value ) {
-		if( !value.startsWith( VARIABLE_PREFIX ) )
-			return value;
-
-		if( value.startsWith( REF_PREFIX ) )
-			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 );
-		if( newValue == null ) {
-			if( optional )
-				return "null";
-
-			System.err.println( "variable or reference '" + value + "' not found" );
-			throw new IllegalArgumentException( value );
-		}
-
-		return resolveValue( properties, newValue );
-	}
-
-	private Object parseValue( String key, String value, Function<String, String> resolver ) {
-		value = value.trim();
-
-		// null, false, true
-		switch( value ) {
-			case "null":		return null;
-			case "false":	return false;
-			case "true":		return true;
-		}
-
-		// borders
-		if( key.endsWith( ".border" ) || key.endsWith( "Border" ) )
-			return parseBorder( value, resolver );
-
-		// icons
-		if( key.endsWith( ".icon" ) || key.endsWith( "Icon" ) )
-			return parseInstance( value );
-
-		// insets
-		if( key.endsWith( ".margin" ) || key.endsWith( ".padding" ) ||
-			key.endsWith( "Margins" ) || key.endsWith( "Insets" ) )
-			return parseInsets( value );
-
-		// scaled number
-		ScaledNumber scaledNumber = parseScaledNumber( key, value );
-		if( scaledNumber != null )
-			return scaledNumber;
-
-		// size
-		if( key.endsWith( "Size" ) && !key.equals( "SplitPane.dividerSize" ))
-			return parseSize( value );
-
-		// width, height
-		if( key.endsWith( "Width" ) || key.endsWith( "Height" ) )
-			return parseInteger( value, true );
-
-		// colors
-		ColorUIResource color = parseColor( value, false );
-		if( color != null )
-			return color;
-
-		// integer
-		Integer integer = parseInteger( value, false );
-		if( integer != null )
-			return integer;
-
-		// string
-		return value;
-	}
-
-	private Object parseBorder( String value, Function<String, String> resolver ) {
-		if( value.indexOf( ',' ) >= 0 ) {
-			// top,left,bottom,right[,lineColor]
-			List<String> parts = split( value, ',' );
-			Insets insets = parseInsets( value );
-			ColorUIResource lineColor = (parts.size() == 5)
-				? parseColor( resolver.apply( parts.get( 4 ) ), true )
-				: null;
-
-			return (LazyValue) t -> {
-				return (lineColor != null)
-					? new FlatLineBorder( insets, lineColor )
-					: new FlatEmptyBorder( insets );
-			};
-		} else
-			return parseInstance( value );
-	}
-
-	private Object parseInstance( String value ) {
-		return (LazyValue) t -> {
+	private static void reSetLookAndFeel() {
+		EventQueue.invokeLater( () -> {
+			LookAndFeel lookAndFeel = UIManager.getLookAndFeel();
 			try {
-				return Class.forName( value ).newInstance();
-			} catch( InstantiationException | IllegalAccessException | ClassNotFoundException ex ) {
-				ex.printStackTrace();
-				return null;
+				// re-set current LaF
+				UIManager.setLookAndFeel( lookAndFeel );
+
+				// must fire property change events ourself because old and new LaF are the same
+				PropertyChangeEvent e = new PropertyChangeEvent( UIManager.class, "lookAndFeel", lookAndFeel, lookAndFeel );
+				for( PropertyChangeListener l : UIManager.getPropertyChangeListeners() )
+					l.propertyChange( e );
+
+				// update UI
+				updateUI();
+			} catch( UnsupportedLookAndFeelException ex ) {
+				LOG.log( Level.SEVERE, "FlatLaf: Failed to reinitialize look and feel '" + lookAndFeel.getClass().getName() + "'.", ex );
 			}
-		};
+		} );
 	}
 
-	private Insets parseInsets( String value ) {
-		List<String> numbers = split( value, ',' );
-		try {
-			return new InsetsUIResource(
-				Integer.parseInt( numbers.get( 0 ) ),
-				Integer.parseInt( numbers.get( 1 ) ),
-				Integer.parseInt( numbers.get( 2 ) ),
-				Integer.parseInt( numbers.get( 3 ) ) );
-		} catch( NumberFormatException ex ) {
-			System.err.println( "invalid insets '" + value + "'" );
-			throw ex;
-		}
-	}
-
-	private Dimension parseSize( String value ) {
-		List<String> numbers = split( value, ',' );
-		try {
-			return new DimensionUIResource(
-				Integer.parseInt( numbers.get( 0 ) ),
-				Integer.parseInt( numbers.get( 1 ) ) );
-		} catch( NumberFormatException ex ) {
-			System.err.println( "invalid size '" + value + "'" );
-			throw ex;
-		}
-	}
-
-	private ColorUIResource parseColor( String value, boolean reportError ) {
-		try {
-			int rgb = Integer.parseInt( value, 16 );
-			if( value.length() == 6 )
-				return new ColorUIResource( rgb );
-			if( value.length() == 8 )
-				return new ColorUIResource( new Color( rgb, true ) );
-
-			if( reportError )
-				throw new NumberFormatException( value );
-		} catch( NumberFormatException ex ) {
-			if( reportError ) {
-				System.err.println( "invalid color '" + value + "'" );
-				throw ex;
-			}
-			// not a color --> ignore
-		}
-		return null;
-	}
-
-	private Integer parseInteger( String value, boolean reportError ) {
-		try {
-			return Integer.parseInt( value );
-		} catch( NumberFormatException ex ) {
-			if( reportError ) {
-				System.err.println( "invalid integer '" + value + "'" );
-				throw ex;
-			}
-		}
-		return null;
-	}
-
-	private ScaledNumber parseScaledNumber( String key, String value ) {
-		if( !key.equals( "OptionPane.buttonMinimumWidth" ) &&
-			!key.equals( "SplitPane.oneTouchButtonSize" ) &&
-			!key.equals( "SplitPane.oneTouchButtonOffset" ) )
-		  return null; // not supported
-
-		try {
-			return new ScaledNumber( Integer.parseInt( value ) );
-		} catch( NumberFormatException ex ) {
-			System.err.println( "invalid integer '" + value + "'" );
-			throw ex;
-		}
-	}
-
-	public static List<String> split( String str, char delim ) {
-		ArrayList<String> strs = new ArrayList<>();
-		int delimIndex = str.indexOf( delim );
-		int index = 0;
-		while( delimIndex >= 0 ) {
-			strs.add( str.substring( index, delimIndex ) );
-			index = delimIndex + 1;
-			delimIndex = str.indexOf( delim, index );
-		}
-		strs.add( str.substring( index ) );
-
-		return strs;
+	/**
+	 * Update UI of all application windows.
+	 * Invoke after changing LaF.
+	 */
+	public static void updateUI() {
+		for( Window w : Window.getWindows() )
+			SwingUtilities.updateComponentTreeUI( w );
 	}
 
 	public static boolean isShowMnemonics() {
-		return altKeyPressed || !UIManager.getBoolean( "Component.hideMnemonics" );
+		return showMnemonics || !UIManager.getBoolean( "Component.hideMnemonics" );
 	}
 
-	private static void altKeyChanged( boolean pressed ) {
-		if( pressed == altKeyPressed )
+	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() );
+		} else {
+			// Alt key must be pressed on Windows and Linux
+			if( keyCode == KeyEvent.VK_ALT )
+				showMnemonics( e.getID() == KeyEvent.KEY_PRESSED );
+		}
+	}
+
+	private static void showMnemonics( boolean show ) {
+		if( show == showMnemonics )
 			return;
 
-		altKeyPressed = pressed;
+		showMnemonics = show;
 
 		// check whether it is necessary to repaint
 		if( !UIManager.getBoolean( "Component.hideMnemonics" ) )

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

@@ -19,11 +19,17 @@ package com.formdev.flatlaf;
 /**
  * A Flat LaF that has a light color scheme.
  *
+ * The UI defaults are loaded from FlatLightLaf.properties and FlatLaf.properties
+ *
  * @author Karl Tauber
  */
 public class FlatLightLaf
 	extends FlatLaf
 {
+	public static boolean install( ) {
+		return install( new FlatLightLaf() );
+	}
+
 	@Override
 	public String getName() {
 		return "Flat Light";
@@ -33,4 +39,9 @@ public class FlatLightLaf
 	public String getDescription() {
 		return "Flat Light Look and Feel";
 	}
+
+	@Override
+	public boolean isDark() {
+		return false;
+	}
 }

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

@@ -0,0 +1,537 @@
+/*
+ * Copyright 2019 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
+ *
+ *     http://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.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.Reader;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Enumeration;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.logging.Level;
+import javax.swing.UIDefaults;
+import javax.swing.plaf.ColorUIResource;
+import com.formdev.flatlaf.json.Json;
+import com.formdev.flatlaf.json.ParseException;
+import com.formdev.flatlaf.util.StringUtils;
+
+/**
+ * This class supports loading IntelliJ .theme.json files and using them as a Laf.
+ *
+ * .theme.json files are used by Theme plugins for IntelliJ IDEA and other
+ * JetBrains IDEs that are based on IntelliJ platform.
+ *
+ * Here you can find IntelliJ Theme plugins:
+ *   https://plugins.jetbrains.com/search?tags=Theme
+ *
+ * The IntelliJ .theme.json file are documented here:
+ *   http://www.jetbrains.org/intellij/sdk/docs/reference_guide/ui_themes/themes_customize.html
+ *
+ * @author Karl Tauber
+ */
+public class IntelliJTheme
+{
+	public final String name;
+	public final boolean dark;
+	public final String author;
+
+	private final Map<String, String> colors;
+	private final Map<String, Object> ui;
+	private final Map<String, Object> icons;
+
+	private Map<String, ColorUIResource> namedColors = Collections.emptyMap();
+
+	/**
+	 * Loads a IntelliJ .theme.json file from the given input stream,
+	 * creates a Laf instance for it and installs it.
+	 *
+	 * The input stream is automatically closed.
+	 * Using a buffered input stream is not necessary.
+	 */
+	public static boolean install( InputStream in ) {
+		try {
+		    return FlatLaf.install( createLaf( in ) );
+		} catch( Exception ex ) {
+			FlatLaf.LOG.log( Level.SEVERE, "FlatLaf: Failed to load IntelliJ theme", ex );
+		    return false;
+		}
+	}
+
+	/**
+	 * Loads a IntelliJ .theme.json file from the given input stream and
+	 * creates a Laf instance for it.
+	 *
+	 * The input stream is automatically closed.
+	 * Using a buffered input stream is not necessary.
+	 */
+	public static FlatLaf createLaf( InputStream in )
+		throws IOException, ParseException
+	{
+		return createLaf( new IntelliJTheme( in ) );
+	}
+
+	/**
+	 * Creates a Laf instance for the given IntelliJ theme.
+	 */
+	public static FlatLaf createLaf( IntelliJTheme theme ) {
+		return new ThemeLaf( theme );
+	}
+
+	/**
+	 * Loads a IntelliJ .theme.json file from the given input stream.
+	 *
+	 * The input stream is automatically closed.
+	 * Using a buffered input stream is not necessary.
+	 */
+	@SuppressWarnings( "unchecked" )
+	public IntelliJTheme( InputStream in )
+		throws IOException, ParseException
+	{
+		Map<String, Object> json;
+	    try( Reader reader = new InputStreamReader( in, StandardCharsets.UTF_8 ) ) {
+	    		json = (Map<String, Object>) Json.parse( reader );
+		}
+
+	    name = (String) json.get( "name" );
+	    dark = Boolean.parseBoolean( (String) json.get( "dark" ) );
+	    author = (String) json.get( "author" );
+
+	    colors = (Map<String, String>) json.get( "colors" );
+	    ui = (Map<String, Object>) json.get( "ui" );
+	    icons = (Map<String, Object>) json.get( "icons" );
+	}
+
+	private void applyProperties( UIDefaults defaults ) {
+		if( ui == null )
+			return;
+
+		defaults.put( "Component.isIntelliJTheme", true );
+
+		// enable button shadows
+		defaults.put( "Button.paintShadow", true );
+		defaults.put( "Button.shadowWidth", dark ? 2 : 1 );
+
+		loadNamedColors( defaults );
+
+		// convert Json "ui" structure to UI defaults
+		ArrayList<Object> defaultsKeysCache = new ArrayList<>();
+		Set<String> uiKeys = new HashSet<>();
+		for( Map.Entry<String, Object> e : ui.entrySet() )
+			apply( e.getKey(), e.getValue(), defaults, defaultsKeysCache, uiKeys );
+
+		applyColorPalette( defaults );
+		applyCheckBoxColors( defaults );
+
+		// 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" );
+		if( helpButtonBackground == null )
+			helpButtonBackground = defaults.get( "Button.background" );
+		if( helpButtonBorderColor == null )
+			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.disabledBorderColor", defaults.get( "Button.disabledBorderColor" ) );
+		defaults.put( "HelpButton.focusedBorderColor", defaults.get( "Button.focusedBorderColor" ) );
+		defaults.put( "HelpButton.focusedBackground", defaults.get( "Button.focusedBackground" ) );
+
+		// IDEA uses TextField.background for editable ComboBox and Spinner
+		defaults.put( "ComboBox.editableBackground", defaults.get( "TextField.background" ) );
+		defaults.put( "Spinner.background", defaults.get( "TextField.background" ) );
+
+		// Spinner arrow button always has same colors as ComboBox arrow button
+		defaults.put( "Spinner.buttonBackground", defaults.get( "ComboBox.buttonEditableBackground" ) );
+		defaults.put( "Spinner.buttonArrowColor", defaults.get( "ComboBox.buttonArrowColor" ) );
+		defaults.put( "Spinner.buttonDisabledArrowColor", defaults.get( "ComboBox.buttonDisabledArrowColor" ) );
+
+		// some themes specify colors for TextField.background, but forget to specify it for other components
+		// (probably because those components are not used in IntelliJ)
+		if( uiKeys.contains( "TextField.background" ) ) {
+			Object textFieldBackground = defaults.get( "TextField.background" );
+			if( !uiKeys.contains( "FormattedTextField.background" ) )
+				defaults.put( "FormattedTextField.background", textFieldBackground );
+			if( !uiKeys.contains( "PasswordField.background" ) )
+				defaults.put( "PasswordField.background", textFieldBackground );
+			if( !uiKeys.contains( "EditorPane.background" ) )
+				defaults.put( "EditorPane.background", textFieldBackground );
+			if( !uiKeys.contains( "TextArea.background" ) )
+				defaults.put( "TextArea.background", textFieldBackground );
+			if( !uiKeys.contains( "TextPane.background" ) )
+				defaults.put( "TextPane.background", textFieldBackground );
+			if( !uiKeys.contains( "Spinner.background" ) )
+				defaults.put( "Spinner.background", textFieldBackground );
+		}
+	}
+
+	/**
+	 * http://www.jetbrains.org/intellij/sdk/docs/reference_guide/ui_themes/themes_customize.html#defining-named-colors
+	 */
+	private void loadNamedColors( UIDefaults defaults ) {
+		if( colors == null )
+			return;
+
+		namedColors = new HashMap<>();
+
+		for( Map.Entry<String, String> e : colors.entrySet() ) {
+			String value = e.getValue();
+			ColorUIResource color = UIDefaultsLoader.parseColor( value );
+			if( color != null ) {
+				String key = e.getKey();
+				namedColors.put( key, color );
+				defaults.put( "ColorPalette." + e.getKey(), color );
+			}
+		}
+	}
+
+	/**
+	 * http://www.jetbrains.org/intellij/sdk/docs/reference_guide/ui_themes/themes_customize.html#custom-ui-control-colors
+	 */
+	@SuppressWarnings( "unchecked" )
+	private void apply( String key, Object value, UIDefaults defaults, ArrayList<Object> defaultsKeysCache, Set<String> uiKeys ) {
+		if( value instanceof Map ) {
+			for( Map.Entry<String, Object> e : ((Map<String, Object>)value).entrySet() )
+				apply( key + '.' + e.getKey(), e.getValue(), defaults, defaultsKeysCache, uiKeys );
+		} else {
+			uiKeys.add( key );
+
+			// map keys
+			key = uiKeyMapping.getOrDefault( key, key );
+			if( key.isEmpty() )
+				return; // ignore key
+
+			String valueStr = value.toString();
+
+			// map named colors
+			Object uiValue = namedColors.get( valueStr );
+
+			// parse value
+			if( uiValue == null ) {
+				// fix errors (missing '#' for colors)
+				if( !valueStr.startsWith( "#" ) && (key.endsWith( "ground" ) || key.endsWith( "Color" )) )
+					valueStr = fixColorIfValid( "#" + valueStr, valueStr );
+				else if( valueStr.startsWith( "##" ) )
+					valueStr = fixColorIfValid( valueStr.substring( 1 ), valueStr );
+				else if( key.endsWith( ".border" ) || key.endsWith( "Border" ) ) {
+					List<String> parts = StringUtils.split( valueStr, ',' );
+					if( parts.size() == 5 && !parts.get( 4 ).startsWith( "#" ) ) {
+						parts.set( 4, "#" + parts.get( 4 ) );
+						valueStr = String.join( ",", parts );
+					}
+				}
+
+				// parse value
+				try {
+					uiValue = UIDefaultsLoader.parseValue( key, valueStr );
+				} catch( RuntimeException ex ) {
+					UIDefaultsLoader.logParseError( Level.CONFIG, key, valueStr, ex );
+					return; // ignore invalid value
+				}
+			}
+
+			if( key.startsWith( "*." ) ) {
+				// wildcard
+				String tail = key.substring( 1 );
+
+				// because we can not iterate over the UI defaults keys while
+				// modifying UI defaults in the same loop, we have to copy the keys
+				if( defaultsKeysCache.size() != defaults.size() ) {
+					defaultsKeysCache.clear();
+					Enumeration<Object> e = defaults.keys();
+					while( e.hasMoreElements() )
+						defaultsKeysCache.add( e.nextElement() );
+				}
+
+				// replace all values in UI defaults that match the wildcard key
+				for( Object k : defaultsKeysCache ) {
+					if( k instanceof String ) {
+						// support replacing of mapped keys
+						// (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." ) )
+							defaults.put( k, uiValue );
+					}
+				}
+			} else
+				defaults.put( key, uiValue );
+		}
+	}
+
+	private String fixColorIfValid( String newColorStr, String colorStr ) {
+		try {
+			// check whether it is valid
+			UIDefaultsLoader.parseColorRGBA( newColorStr );
+
+			return newColorStr;
+		} catch( IllegalArgumentException ex ) {
+			return colorStr;
+		}
+	}
+
+	private void applyColorPalette( UIDefaults defaults ) {
+		if( icons == null )
+			return;
+
+		Object palette = icons.get( "ColorPalette" );
+		if( !(palette instanceof Map) )
+			return;
+
+		@SuppressWarnings( "unchecked" )
+		Map<String, Object> colorPalette = (Map<String, Object>) palette;
+		for( Map.Entry<String, Object> e : colorPalette.entrySet() ) {
+			String key = e.getKey();
+			Object value = e.getValue();
+			if( key.startsWith( "Checkbox." ) || !(value instanceof String) )
+				continue;
+
+			if( dark )
+				key = StringUtils.removeTrailing( key, ".Dark" );
+
+			ColorUIResource color = toColor( (String) value );
+			if( color != null )
+				defaults.put( key, color );
+		}
+	}
+
+	private ColorUIResource toColor( String value ) {
+		// map named colors
+		ColorUIResource color = namedColors.get( value );
+
+		// parse color
+		return (color != null) ? color : UIDefaultsLoader.parseColor( value );
+	}
+
+	/**
+	 * Because IDEA uses SVGs for check boxes and radio buttons the colors for
+	 * this two components are specified in "icons > ColorPalette".
+	 * FlatLaf uses vector icons and expects colors for the two components in UI defaults.
+	 */
+	private void applyCheckBoxColors( UIDefaults defaults ) {
+		if( icons == null )
+			return;
+
+		Object palette = icons.get( "ColorPalette" );
+		if( !(palette instanceof Map) )
+			return;
+
+		boolean checkboxModified = false;
+		@SuppressWarnings( "unchecked" )
+		Map<String, Object> colorPalette = (Map<String, Object>) palette;
+		for( Map.Entry<String, Object> e : colorPalette.entrySet() ) {
+			String key = e.getKey();
+			Object value = e.getValue();
+			if( !key.startsWith( "Checkbox." ) || !(value instanceof String) )
+				continue;
+
+			if( key.equals( "Checkbox.Background.Default" ) ||
+				key.equals( "Checkbox.Foreground.Selected" ) )
+			{
+				// This two keys do not work correctly in IDEA because they
+				// map SVG color "#ffffff" to another color, but checkBox.svg and
+				// radio.svg (in package com.intellij.ide.ui.laf.icons.intellij)
+				// use "#fff". So use white to get same appearance as in IDEA.
+				value = "#ffffff";
+			}
+
+			String key2 = checkboxDuplicateColors.get( key );
+
+			if( dark )
+				key = StringUtils.removeTrailing( key, ".Dark" );
+
+			String newKey = checkboxKeyMapping.get( key );
+			if( newKey != null ) {
+				ColorUIResource color = toColor( (String) value );
+				if( color != null ) {
+					defaults.put( newKey, color );
+
+					if( key2 != null ) {
+						// When IDEA replaces colors in SVGs it uses color values and not the keys
+						// from com.intellij.ide.ui.UITheme.colorPalette, but there are some keys that
+						// have same color value:
+						//   - Checkbox.Background.Default.Dark  has same color as  Checkbox.Background.Selected.Dark
+						//   - Checkbox.Border.Default.Dark      has same color as  Checkbox.Border.Selected.Dark
+						//   - Checkbox.Focus.Thin.Default.Dark  has same color as  Checkbox.Focus.Thin.Selected.Dark
+						//
+						// So if only e.g. Checkbox.Background.Default.Dark is specified in .theme.json,
+						// then this color is also used for Checkbox.Background.Selected.Dark.
+						//
+						// If Checkbox.Background.Default.Dark and Checkbox.Background.Selected.Dark
+						// are specified in .theme.json, then the later specified is used for both.
+						if( dark )
+							key2 = StringUtils.removeTrailing( key2, ".Dark" );
+
+						String newKey2 = checkboxKeyMapping.get( key2 );
+						if( newKey2 != null )
+							defaults.put( newKey2, color );
+					}
+				}
+
+				checkboxModified = true;
+			}
+		}
+
+		// remove hover and pressed colors
+		if( checkboxModified ) {
+			defaults.remove( "CheckBox.icon.hoverBorderColor" );
+			defaults.remove( "CheckBox.icon.focusedBackground" );
+			defaults.remove( "CheckBox.icon.hoverBackground" );
+			defaults.remove( "CheckBox.icon.pressedBackground" );
+			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() ) );
+	}
+
+	private static Map<String, String> uiKeyMapping = new HashMap<>();
+	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
+		uiKeyMapping.put( "ComboBox.background",                        "" ); // ignore
+		uiKeyMapping.put( "ComboBox.nonEditableBackground",             "ComboBox.background" );
+		uiKeyMapping.put( "ComboBox.ArrowButton.background",            "ComboBox.buttonEditableBackground" );
+		uiKeyMapping.put( "ComboBox.ArrowButton.disabledIconColor",     "ComboBox.buttonDisabledArrowColor" );
+		uiKeyMapping.put( "ComboBox.ArrowButton.iconColor",             "ComboBox.buttonArrowColor" );
+		uiKeyMapping.put( "ComboBox.ArrowButton.nonEditableBackground", "ComboBox.buttonBackground" );
+
+		// Link
+		uiKeyMapping.put( "Link.activeForeground", "Component.linkColor" );
+
+		// ProgressBar
+		uiKeyMapping.put( "ProgressBar.background",    "" ); // ignore
+		uiKeyMapping.put( "ProgressBar.foreground",    "" ); // ignore
+		uiKeyMapping.put( "ProgressBar.trackColor",    "ProgressBar.background" );
+		uiKeyMapping.put( "ProgressBar.progressColor", "ProgressBar.foreground" );
+
+		// ScrollBar
+		uiKeyMapping.put( "ScrollBar.trackColor", "ScrollBar.track" );
+		uiKeyMapping.put( "ScrollBar.thumbColor", "ScrollBar.thumb" );
+
+		// Separator
+		uiKeyMapping.put( "Separator.separatorColor", "Separator.foreground" );
+
+		// Slider
+		uiKeyMapping.put( "Slider.trackWidth", "" ); // ignore (used in Material Theme UI Lite)
+
+		for( Map.Entry<String, String> e : uiKeyMapping.entrySet() )
+			uiKeyInverseMapping.put( e.getValue(), e.getKey() );
+
+		uiKeyCopying.put( "ToggleButton.underline.underlineColor",         "TabbedPane.underlineColor" );
+		uiKeyCopying.put( "ToggleButton.underline.disabledUnderlineColor", "TabbedPane.disabledUnderlineColor" );
+		uiKeyCopying.put( "ToggleButton.underline.selectedBackground",     "TabbedPane.selectedBackground" );
+		uiKeyCopying.put( "ToggleButton.underline.hoverBackground",        "TabbedPane.hoverColor" );
+		uiKeyCopying.put( "ToggleButton.underline.focusBackground",        "TabbedPane.focusColor" );
+
+		checkboxKeyMapping.put( "Checkbox.Background.Default",  "CheckBox.icon.background" );
+		checkboxKeyMapping.put( "Checkbox.Background.Disabled", "CheckBox.icon.disabledBackground" );
+		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.Foreground.Disabled", "CheckBox.icon.disabledCheckmarkColor" );
+		checkboxKeyMapping.put( "Checkbox.Background.Selected", "CheckBox.icon.selectedBackground" );
+		checkboxKeyMapping.put( "Checkbox.Border.Selected",     "CheckBox.icon.selectedBorderColor" );
+		checkboxKeyMapping.put( "Checkbox.Foreground.Selected", "CheckBox.icon.checkmarkColor" );
+		checkboxKeyMapping.put( "Checkbox.Focus.Thin.Selected", "CheckBox.icon.selectedFocusedBorderColor" );
+
+		checkboxDuplicateColors.put( "Checkbox.Background.Default.Dark", "Checkbox.Background.Selected.Dark" );
+		checkboxDuplicateColors.put( "Checkbox.Border.Default.Dark",     "Checkbox.Border.Selected.Dark" );
+		checkboxDuplicateColors.put( "Checkbox.Focus.Thin.Default.Dark", "Checkbox.Focus.Thin.Selected.Dark" );
+		@SuppressWarnings( "unchecked" )
+		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 -----------------------------------------------------
+
+	public static class ThemeLaf
+		extends FlatLaf
+	{
+		private final IntelliJTheme theme;
+
+		public ThemeLaf( IntelliJTheme theme ) {
+			this.theme = theme;
+		}
+
+		@Override
+		public String getName() {
+			return theme.name;
+		}
+
+		@Override
+		public String getDescription() {
+			return theme.name;
+		}
+
+		@Override
+		public boolean isDark() {
+			return theme.dark;
+		}
+
+		public IntelliJTheme getTheme() {
+			return theme;
+		}
+
+		@Override
+		public UIDefaults getDefaults() {
+			UIDefaults defaults = super.getDefaults();
+			theme.applyProperties( defaults );
+			super.invokePostInitialization( defaults );
+			return defaults;
+		}
+
+		@Override
+		void invokePostInitialization( UIDefaults defaults ) {
+		}
+
+		@Override
+		ArrayList<Class<?>> getLafClassesForDefaultsLoading() {
+			ArrayList<Class<?>> lafClasses = new ArrayList<>();
+			lafClasses.add( FlatLaf.class );
+			lafClasses.add( theme.dark ? FlatDarkLaf.class : FlatLightLaf.class );
+			lafClasses.add( theme.dark ? FlatDarculaLaf.class : FlatIntelliJLaf.class );
+			lafClasses.add( ThemeLaf.class );
+			return lafClasses;
+		}
+	}
+}

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

@@ -0,0 +1,250 @@
+/*
+ * Copyright 2019 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
+ *
+ *     http://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.Font;
+import java.awt.GraphicsEnvironment;
+import java.awt.Toolkit;
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.ArrayList;
+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;
+
+/**
+ * @author Karl Tauber
+ */
+class LinuxFontPolicy
+{
+	static Font getFont() {
+		return SystemInfo.IS_KDE ? getKDEFont() : getGnomeFont();
+	}
+
+	/**
+	 * Gets the default font for Gnome.
+	 */
+	private static Font getGnomeFont() {
+		// see class com.sun.java.swing.plaf.gtk.PangoFonts background information
+
+		Object fontName = Toolkit.getDefaultToolkit().getDesktopProperty( "gnome.Gtk/FontName" );
+		if( !(fontName instanceof String) )
+			fontName = "sans 10";
+
+		String family = "";
+		int style = Font.PLAIN;
+		int size = 10;
+
+		StringTokenizer st = new StringTokenizer( (String) fontName );
+		while( st.hasMoreTokens() ) {
+			String word = st.nextToken();
+
+			if( word.equalsIgnoreCase( "italic" ) )
+				style |= Font.ITALIC;
+			else if( word.equalsIgnoreCase( "bold" ) )
+				style |= Font.BOLD;
+			else if( Character.isDigit( word.charAt( 0 ) ) ) {
+				try {
+					size = Integer.parseInt( word );
+				} catch( NumberFormatException ex ) {
+					// ignore
+				}
+			} else
+				family = family.isEmpty() ? word : (family + ' ' + word);
+		}
+
+		// scale font size
+		double dsize = size * getGnomeFontScale();
+		size = (int) (dsize + 0.5);
+		if( size < 1 )
+			size = 1;
+
+		// handle logical font names
+		String logicalFamily = mapFcName( family.toLowerCase() );
+		if( logicalFamily != null )
+			family = logicalFamily;
+
+		return createFont( family, style, size, dsize );
+	}
+
+	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 );
+
+		// set font size in floating points
+		font = font.deriveFont( style, (float) dsize );
+
+		return font;
+	}
+
+	private static double getGnomeFontScale() {
+		// see class com.sun.java.swing.plaf.gtk.PangoFonts background information
+
+		Object value = Toolkit.getDefaultToolkit().getDesktopProperty( "gnome.Xft/DPI" );
+		if( value instanceof Integer ) {
+			int dpi = ((Integer)value).intValue() / 1024;
+			if( dpi == -1 )
+				dpi = 96;
+			if( dpi < 50 )
+				dpi = 50;
+			return dpi / 72.0;
+		} else {
+			return GraphicsEnvironment.getLocalGraphicsEnvironment()
+				.getDefaultScreenDevice().getDefaultConfiguration()
+				.getNormalizingTransform().getScaleY();
+		}
+	}
+
+	/**
+	 * map GTK/fontconfig names to equivalent JDK logical font name
+	 */
+	private static String mapFcName( String name ) {
+		switch( name ) {
+			case "sans":		return "sansserif";
+			case "sans-serif":	return "sansserif";
+			case "serif":		return "serif";
+			case "monospace":	return "monospaced";
+		}
+		return null;
+	}
+
+	/**
+	 * Gets the default font for KDE for KDE configuration files.
+	 *
+	 * The Swing fonts are not updated when the user changes system font size
+	 * (System Settings > Fonts > Force Font DPI). A application restart is necessary.
+	 * This is the same behavior as in native KDE applications.
+	 *
+	 * The "display scale factor" (kdeglobals: [KScreen] > ScaleFactor) is not used
+	 * KDE also does not use it to calculate font size. Only forceFontDPI is used by KDE.
+	 * If user changes "display scale factor" (System Settings > Display and Monitors >
+	 * Displays > Scale Display), the forceFontDPI is also changed to reflect the scale factor.
+	 */
+	private static Font getKDEFont() {
+		List<String> kdeglobals = readConfig( "kdeglobals" );
+		List<String> kcmfonts = readConfig( "kcmfonts" );
+
+		String generalFont = getConfigEntry( kdeglobals, "General", "font" );
+		String forceFontDPI = getConfigEntry( kcmfonts, "General", "forceFontDPI" );
+
+		String family = "sansserif";
+		int style = Font.PLAIN;
+		int size = 10;
+
+		if( generalFont != null ) {
+			List<String> strs = StringUtils.split( generalFont, ',' );
+			try {
+				family = strs.get( 0 );
+				size = Integer.parseInt( strs.get( 1 ) );
+				if( "75".equals( strs.get( 4 ) ) )
+					style |= Font.BOLD;
+				if( "1".equals( strs.get( 5 ) ) )
+					style |= Font.ITALIC;
+			} catch( RuntimeException ex ) {
+				FlatLaf.LOG.log( Level.CONFIG, "FlatLaf: Failed to parse 'font=" + generalFont + "'.", ex );
+			}
+		}
+
+		// font dpi
+		int dpi = 96;
+		if( forceFontDPI != null ) {
+			try {
+				dpi = Integer.parseInt( forceFontDPI );
+				if( dpi <= 0 )
+					dpi = 96;
+				if( dpi < 50 )
+					dpi = 50;
+			} catch( NumberFormatException ex ) {
+				FlatLaf.LOG.log( Level.CONFIG, "FlatLaf: Failed to parse 'forceFontDPI=" + forceFontDPI + "'.", ex );
+			}
+		}
+
+		// scale font size
+		double fontScale = dpi / 72.0;
+		double dsize = size * fontScale;
+		size = (int) (dsize + 0.5);
+		if( size < 1 )
+			size = 1;
+
+		return createFont( family, style, size, dsize );
+	}
+
+	private static List<String> readConfig( String filename ) {
+		File userHome = new File( System.getProperty( "user.home" ) );
+
+		// search for config file
+		String[] configDirs = {
+			".config", // KDE 5
+			".kde4/share/config", // KDE 4
+			".kde/share/config"// KDE 3
+		};
+		File file = null;
+		for( String configDir : configDirs ) {
+			file = new File( userHome, configDir + "/" + filename );
+			if( file.isFile() )
+				break;
+		}
+		if( !file.isFile() )
+			return Collections.emptyList();
+
+		// read config file
+		ArrayList<String> lines = new ArrayList<>( 200 );
+		try( BufferedReader reader = new BufferedReader( new FileReader( file ) ) ) {
+			String line = null;
+			while( (line = reader.readLine()) != null )
+				lines.add( line );
+		} catch( IOException ex ) {
+			FlatLaf.LOG.log( Level.CONFIG, "FlatLaf: Failed to read '" + filename + "'.", ex );
+		}
+		return lines;
+	}
+
+	private static String getConfigEntry( List<String> config, String group, String key ) {
+		int groupLength = group.length();
+		int keyLength = key.length();
+		boolean inGroup = false;
+		for( String line : config ) {
+			if( !inGroup ) {
+				if( line.length() >= groupLength + 2 &&
+					line.charAt( 0 ) == '[' &&
+					line.charAt( groupLength + 1 ) == ']' &&
+					line.indexOf( group ) == 1 )
+				{
+					inGroup = true;
+				}
+			} else {
+				if( line.startsWith( "[" ) )
+					return null;
+
+				if( line.length() >= keyLength + 2 &&
+					line.charAt( keyLength ) == '=' &&
+					line.startsWith( key ) )
+				{
+					return line.substring( keyLength + 1 );
+				}
+			}
+		}
+		return null;
+	}
+}

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

@@ -0,0 +1,687 @@
+/*
+ * Copyright 2019 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
+ *
+ *     http://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.Color;
+import java.awt.Dimension;
+import java.awt.Insets;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Properties;
+import java.util.ServiceLoader;
+import java.util.function.Function;
+import java.util.logging.Level;
+import javax.swing.UIDefaults;
+import javax.swing.UIManager;
+import javax.swing.UIDefaults.ActiveValue;
+import javax.swing.UIDefaults.LazyValue;
+import javax.swing.plaf.ColorUIResource;
+import javax.swing.plaf.DimensionUIResource;
+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.DerivedColor;
+import com.formdev.flatlaf.util.HSLColor;
+import com.formdev.flatlaf.util.StringUtils;
+import com.formdev.flatlaf.util.SystemInfo;
+import com.formdev.flatlaf.util.UIScale;
+
+/**
+ * Load UI defaults from properties files associated to Flat LaF classes and add to UI defaults.
+ *
+ * Each class that extend the LaF class may have its own .properties file
+ * in the same package as the class. Properties from superclasses are loaded
+ * first to give subclasses a chance to override defaults.
+ * E.g. if running FlatDarkLaf, then the FlatLaf.properties is loaded first
+ * and FlatDarkLaf.properties loaded second.
+ *
+ * @author Karl Tauber
+ */
+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 ) {
+		// determine classes in class hierarchy in reverse order
+		ArrayList<Class<?>> lafClasses = new ArrayList<>();
+		for( Class<?> lafClass = lookAndFeelClass;
+			FlatLaf.class.isAssignableFrom( lafClass );
+			lafClass = lafClass.getSuperclass() )
+		{
+			lafClasses.add( 0, lafClass );
+		}
+
+		loadDefaultsFromProperties( lafClasses, defaults );
+	}
+
+	static void loadDefaultsFromProperties( List<Class<?>> lafClasses, UIDefaults defaults ) {
+		try {
+			// load core properties files
+			Properties properties = new Properties();
+			for( Class<?> lafClass : lafClasses ) {
+				String propertiesName = '/' + lafClass.getName().replace( '.', '/' ) + ".properties";
+				try( InputStream in = lafClass.getResourceAsStream( propertiesName ) ) {
+					if( in != null )
+						properties.load( in );
+				}
+			}
+
+			// 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( Class<?> lafClass : lafClasses ) {
+					try( InputStream in = addon.getDefaults( lafClass ) ) {
+						if( in != null )
+							properties.load( in );
+					}
+				}
+			}
+
+			// collect addon class loaders
+			List<ClassLoader> addonClassLoaders = new ArrayList<>();
+			for( FlatDefaultsAddon addon : addonList ) {
+				ClassLoader addonClassLoader = addon.getClass().getClassLoader();
+				if( !addonClassLoaders.contains( addonClassLoader ) )
+					addonClassLoaders.add( addonClassLoader );
+			}
+
+			// 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 );
+			}
+
+			// remove platform specific properties and re-add only properties
+			// for current platform, but with platform prefix removed
+			if( !platformSpecificKeys.isEmpty() ) {
+				String platformPrefix =
+					SystemInfo.IS_WINDOWS ? "[win]" :
+					SystemInfo.IS_MAC ? "[mac]" :
+					SystemInfo.IS_LINUX ? "[linux]" : "[unknown]";
+				for( String key : platformSpecificKeys ) {
+					Object value = properties.remove( key );
+					if( key.startsWith( platformPrefix ) )
+						properties.put( key.substring( platformPrefix.length() ), value );
+				}
+			}
+
+			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() ) {
+				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 );
+				}
+			}
+
+			// 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 );
+				}
+			}
+
+			// add non-global 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 ) )
+					continue;
+
+				String value = resolveValue( properties, (String) e.getValue() );
+				try {
+					defaults.put( key, parseValue( key, value, resolver, addonClassLoaders ) );
+				} catch( RuntimeException ex ) {
+					logParseError( Level.SEVERE, key, value, ex );
+				}
+			}
+		} catch( IOException ex ) {
+			FlatLaf.LOG.log( Level.SEVERE, "FlatLaf: Failed to load properties files.", ex );
+		}
+	}
+
+	static void logParseError( Level level, String key, String value, RuntimeException ex ) {
+		FlatLaf.LOG.log( level, "FlatLaf: Failed to parse: '" + key + '=' + value + '\'', ex );
+	}
+
+	private static String resolveValue( Properties properties, String 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 );
+		if( newValue == null ) {
+			if( optional )
+				return "null";
+
+			throw new IllegalArgumentException( "variable or property '" + value + "' not found" );
+		}
+
+		return resolveValue( properties, newValue );
+	}
+
+	private enum ValueType { UNKNOWN, STRING, INTEGER, FLOAT, BORDER, ICON, INSETS, DIMENSION, COLOR, SCALEDINTEGER, INSTANCE, CLASS }
+
+	static Object parseValue( String key, String value ) {
+		return parseValue( key, value, v -> v, Collections.emptyList() );
+	}
+
+	private static Object parseValue( String key, String value, Function<String, String> resolver, List<ClassLoader> addonClassLoaders ) {
+		value = value.trim();
+
+		// null, false, true
+		switch( value ) {
+			case "null":	return null;
+			case "false":	return false;
+			case "true":	return true;
+		}
+
+		// check for function "lazy"
+		//     Syntax: lazy(uiKey)
+		if( value.startsWith( "lazy(" ) && value.endsWith( ")" ) ) {
+			String uiKey = value.substring( 5, value.length() - 1 ).trim();
+			return (LazyValue) t -> {
+				return lazyUIManagerGet( uiKey );
+			};
+		}
+
+		ValueType valueType = ValueType.UNKNOWN;
+
+		// check whether value type is specified in the value
+		if( value.startsWith( "#" ) )
+			valueType = ValueType.COLOR;
+		else if( value.startsWith( "\"" ) && value.endsWith( "\"" ) ) {
+			valueType = ValueType.STRING;
+			value = value.substring( 1, value.length() - 1 );
+		} else if( value.startsWith( TYPE_PREFIX ) ) {
+			int end = value.indexOf( TYPE_PREFIX_END );
+			if( end != -1 ) {
+				try {
+					String typeStr = value.substring( TYPE_PREFIX.length(), end );
+					valueType = ValueType.valueOf( typeStr.toUpperCase( Locale.ENGLISH ) );
+
+					// remove type from value
+					value = value.substring( end + TYPE_PREFIX_END.length() );
+				} catch( IllegalArgumentException ex ) {
+					// ignore
+				}
+			}
+		}
+
+		// determine value type from key
+		if( valueType == ValueType.UNKNOWN ) {
+			if( key.endsWith( "ground" ) || key.endsWith( "Color" ) )
+				valueType = ValueType.COLOR;
+			else if( key.endsWith( ".border" ) || key.endsWith( "Border" ) )
+				valueType = ValueType.BORDER;
+			else if( key.endsWith( ".icon" ) || key.endsWith( "Icon" ) )
+				valueType = ValueType.ICON;
+			else if( key.endsWith( ".margin" ) || key.endsWith( ".padding" ) ||
+					 key.endsWith( "Margins" ) || key.endsWith( "Insets" ) )
+				valueType = ValueType.INSETS;
+			else if( key.endsWith( "Size" ) )
+				valueType = ValueType.DIMENSION;
+			else if( key.endsWith( "Width" ) || key.endsWith( "Height" ) )
+				valueType = ValueType.INTEGER;
+			else if( key.endsWith( "UI" ) )
+				valueType = ValueType.STRING;
+		}
+
+		// parse value
+		switch( valueType ) {
+			case STRING:		return value;
+			case INTEGER:		return parseInteger( value, true );
+			case FLOAT:			return parseFloat( value, true );
+			case BORDER:		return parseBorder( value, resolver, addonClassLoaders );
+			case ICON:			return parseInstance( value, addonClassLoaders );
+			case INSETS:		return parseInsets( value );
+			case DIMENSION:		return parseDimension( value );
+			case COLOR:			return parseColorOrFunction( value, resolver, true );
+			case SCALEDINTEGER:	return parseScaledInteger( value );
+			case INSTANCE:		return parseInstance( value, addonClassLoaders );
+			case CLASS:			return parseClass( value, addonClassLoaders );
+			case UNKNOWN:
+			default:
+				// colors
+				Object color = parseColorOrFunction( value, resolver, false );
+				if( color != null )
+					return color;
+
+				// integer
+				Integer integer = parseInteger( value, false );
+				if( integer != null )
+					return integer;
+
+				// float
+				Float f = parseFloat( value, false );
+				if( f != null )
+					return f;
+
+				// 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]
+			List<String> parts = split( value, ',' );
+			Insets insets = parseInsets( value );
+			ColorUIResource lineColor = (parts.size() == 5)
+				? (ColorUIResource) parseColorOrFunction( resolver.apply( parts.get( 4 ) ), resolver, true )
+				: null;
+
+			return (LazyValue) t -> {
+				return (lineColor != null)
+					? new FlatLineBorder( insets, lineColor )
+					: new FlatEmptyBorder( insets );
+			};
+		} else
+			return parseInstance( value, addonClassLoaders );
+	}
+
+	private static Object parseInstance( String value, List<ClassLoader> addonClassLoaders ) {
+		return (LazyValue) t -> {
+			try {
+				return findClass( value, addonClassLoaders ).newInstance();
+			} catch( InstantiationException | IllegalAccessException | ClassNotFoundException ex ) {
+				FlatLaf.LOG.log( Level.SEVERE, "FlatLaf: Failed to instantiate '" + value + "'.", ex );
+				return null;
+			}
+		};
+	}
+
+	private static Object parseClass( String value, List<ClassLoader> addonClassLoaders ) {
+		return (LazyValue) t -> {
+			try {
+				return findClass( value, addonClassLoaders );
+			} catch( ClassNotFoundException ex ) {
+				FlatLaf.LOG.log( Level.SEVERE, "FlatLaf: Failed to find class '" + value + "'.", ex );
+				return null;
+			}
+		};
+	}
+
+	private static Class<?> findClass( String className, List<ClassLoader> addonClassLoaders )
+		throws ClassNotFoundException
+	{
+		try {
+			return Class.forName( className );
+		} catch( ClassNotFoundException ex ) {
+			// search in addons class loaders
+			for( ClassLoader addonClassLoader : addonClassLoaders ) {
+				try {
+					return addonClassLoader.loadClass( className );
+				} catch( ClassNotFoundException ex2 ) {
+					// ignore
+				}
+			}
+			throw ex;
+		}
+	}
+
+	private static Insets parseInsets( String value ) {
+		List<String> numbers = split( value, ',' );
+		try {
+			return new InsetsUIResource(
+				Integer.parseInt( numbers.get( 0 ) ),
+				Integer.parseInt( numbers.get( 1 ) ),
+				Integer.parseInt( numbers.get( 2 ) ),
+				Integer.parseInt( numbers.get( 3 ) ) );
+		} catch( NumberFormatException ex ) {
+			throw new IllegalArgumentException( "invalid insets '" + value + "'" );
+		}
+	}
+
+	private static Dimension parseDimension( String value ) {
+		List<String> numbers = split( value, ',' );
+		try {
+			return new DimensionUIResource(
+				Integer.parseInt( numbers.get( 0 ) ),
+				Integer.parseInt( numbers.get( 1 ) ) );
+		} catch( NumberFormatException ex ) {
+			throw new IllegalArgumentException( "invalid size '" + value + "'" );
+		}
+	}
+
+	private static Object parseColorOrFunction( String value, Function<String, String> resolver, boolean reportError ) {
+		if( value.endsWith( ")" ) )
+			return parseColorFunctions( value, resolver, reportError );
+
+		return parseColor( value, reportError );
+	}
+
+	static ColorUIResource parseColor( String value ) {
+		return parseColor( value, false );
+	}
+
+	private static ColorUIResource parseColor( String value, boolean reportError ) {
+		try {
+			int rgba = parseColorRGBA( value );
+			return ((rgba & 0xff000000) == 0xff000000)
+				? new ColorUIResource( rgba )
+				: new ColorUIResource( new Color( rgba, true ) );
+		} catch( IllegalArgumentException ex ) {
+			if( reportError )
+				throw new IllegalArgumentException( "invalid color '" + value + "'" );
+
+			// not a color --> ignore
+		}
+		return null;
+	}
+
+	/**
+	 * Parses a hex color in  {@code #RGB}, {@code #RGBA}, {@code #RRGGBB} or {@code #RRGGBBAA}
+	 * format and returns it as {@code rgba} integer suitable for {@link java.awt.Color},
+	 * which includes alpha component in bits 24-31.
+	 *
+	 * @throws IllegalArgumentException
+	 */
+	static int parseColorRGBA( String value ) {
+		int len = value.length();
+		if( (len != 4 && len != 5 && len != 7 && len != 9) || value.charAt( 0 ) != '#' )
+			throw new IllegalArgumentException();
+
+		// parse hex
+		int n = 0;
+		for( int i = 1; i < len; i++ ) {
+			char ch = value.charAt( i );
+
+			int digit;
+			if( ch >= '0' && ch <= '9' )
+				digit = ch - '0';
+			else if( ch >= 'a' && ch <= 'f' )
+				digit = ch - 'a' + 10;
+			else if( ch >= 'A' && ch <= 'F' )
+				digit = ch - 'A' + 10;
+			else
+				throw new IllegalArgumentException();
+
+			n = (n << 4) | digit;
+		}
+
+		if( len <= 5 ) {
+			// double nibbles
+			int n1 = n & 0xf000;
+			int n2 = n & 0xf00;
+			int n3 = n & 0xf0;
+			int n4 = n & 0xf;
+			n = (n1 << 16) | (n1 << 12) | (n2 << 12) | (n2 << 8) | (n3 << 8) | (n3 << 4) | (n4 << 4) | n4;
+		}
+
+		return (len == 4 || len == 7)
+			? (0xff000000 | n) // set alpha to 255
+			: (((n >> 8) & 0xffffff) | ((n & 0xff) << 24)); // move alpha from lowest to highest byte
+	}
+
+	private static Object parseColorFunctions( String value, Function<String, String> resolver, boolean reportError ) {
+		int paramsStart = value.indexOf( '(' );
+		if( paramsStart < 0 ) {
+			if( reportError )
+				throw new IllegalArgumentException( "missing opening parenthesis in function '" + value + "'" );
+			return null;
+		}
+
+		String function = value.substring( 0, paramsStart ).trim();
+		List<String> params = splitFunctionParams( value.substring( paramsStart + 1, value.length() - 1 ), ',' );
+		if( params.isEmpty() )
+			throw new IllegalArgumentException( "missing parameters in function '" + value + "'" );
+
+		switch( function ) {
+			case "rgb":			return parseColorRgbOrRgba( false, params );
+			case "rgba":		return parseColorRgbOrRgba( true, params );
+			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 );
+		}
+
+		throw new IllegalArgumentException( "unknown color function '" + value + "'" );
+	}
+
+	/**
+	 * 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
+	 */
+	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;
+
+		return hasAlpha
+			? new ColorUIResource( new Color( red, green, blue, alpha ) )
+			: new ColorUIResource( red, green, blue );
+	}
+
+	/**
+	 * Syntax: hsl(hue,saturation,lightness) or hsla(hue,saturation,lightness,alpha)
+	 *   - hue: an integer 0-360 representing degrees
+	 *   - saturation: a percentage 0-100%
+	 *   - lightness: a percentage 0-100%
+	 *   - alpha: a percentage 0-100%
+	 */
+	private static ColorUIResource parseColorHslOrHsla( boolean hasAlpha, List<String> params ) {
+		int hue = parseInteger( params.get( 0 ), 0, 360 );
+		int saturation = parsePercentage( params.get( 1 ) );
+		int lightness = parsePercentage( params.get( 2 ) );
+		int alpha = hasAlpha ? parsePercentage( params.get( 3 ) ) : 100;
+
+		float[] hsl = new float[] { hue, saturation, lightness };
+		return new ColorUIResource( HSLColor.toRGB( hsl, alpha / 100f ) );
+	}
+
+	/**
+	 * Syntax: lighten([color,]amount[,options]) or darken([color,]amount[,options])
+	 *   - color: a color (e.g. #f00) or a color function
+	 *   - amount: percentage 0-100%
+	 *   - options: [relative] [autoInverse] [lazy]
+	 */
+	private static Object parseColorLightenOrDarken( boolean lighten, 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++ ) );
+		boolean relative = false;
+		boolean autoInverse = false;
+		boolean lazy = false;
+
+		if( params.size() > nextParam ) {
+			String options = params.get( nextParam++ );
+			relative = options.contains( "relative" );
+			autoInverse = options.contains( "autoInverse" );
+			lazy = options.contains( "lazy" );
+		}
+
+		ColorFunctions.ColorFunction function = lighten
+			? new ColorFunctions.Lighten( amount, relative, autoInverse )
+			: new ColorFunctions.Darken( amount, relative, autoInverse );
+
+		if( isDerived )
+			return new DerivedColor( function );
+
+		if( lazy ) {
+			return (LazyValue) t -> {
+				Object color = lazyUIManagerGet( colorStr );
+				return (color instanceof Color)
+					? new ColorUIResource( ColorFunctions.applyFunctions( (Color) color, function ) )
+					: null;
+			};
+		}
+
+		ColorUIResource color = (ColorUIResource) parseColorOrFunction( resolver.apply( colorStr ), resolver, reportError );
+		return new ColorUIResource( ColorFunctions.applyFunctions( color, function ) );
+	}
+
+	private static int parsePercentage( String value ) {
+		if( !value.endsWith( "%" ) )
+			throw new NumberFormatException( "invalid percentage '" + value + "'" );
+
+		int val;
+		try {
+			val = Integer.parseInt( value.substring( 0, value.length() - 1 ) );
+		} catch( NumberFormatException ex ) {
+			throw new NumberFormatException( "invalid percentage '" + value + "'" );
+		}
+
+		if( val < 0 || val > 100 )
+			throw new IllegalArgumentException( "percentage out of range (0-100%) '" + value + "'" );
+		return val;
+	}
+
+	private static Integer parseInteger( String value, int min, int max ) {
+		Integer integer = parseInteger( value, true );
+		if( integer.intValue() < min || integer.intValue() > max )
+			throw new NumberFormatException( "integer '" + value + "' out of range (" + min + '-' + max + ')' );
+		return integer;
+	}
+
+	private static Integer parseInteger( String value, boolean reportError ) {
+		try {
+			return Integer.parseInt( value );
+		} catch( NumberFormatException ex ) {
+			if( reportError )
+				throw new NumberFormatException( "invalid integer '" + value + "'" );
+		}
+		return null;
+	}
+
+	private static Float parseFloat( String value, boolean reportError ) {
+		try {
+			return Float.parseFloat( value );
+		} catch( NumberFormatException ex ) {
+			if( reportError )
+				throw new NumberFormatException( "invalid float '" + value + "'" );
+		}
+		return null;
+	}
+
+	private static ActiveValue parseScaledInteger( String value ) {
+		int val = parseInteger( value, true );
+		return (ActiveValue) t -> {
+			return UIScale.scale( val );
+		};
+	}
+
+	/**
+	 * Split string and trim parts.
+	 */
+	private static List<String> split( String str, char delim ) {
+		List<String> result = StringUtils.split( str, delim );
+
+		// trim strings
+		int size = result.size();
+		for( int i = 0; i < size; i++ )
+			result.set( i, result.get( i ).trim() );
+
+		return result;
+	}
+
+	/**
+	 * Splits function parameters and allows using functions as parameters.
+	 * In other words: Delimiters surrounded by '(' and ')' are ignored.
+	 */
+	private static List<String> splitFunctionParams( String str, char delim ) {
+		ArrayList<String> strs = new ArrayList<>();
+		int nestLevel = 0;
+		int start = 0;
+		int strlen = str.length();
+		for( int i = 0; i < strlen; i++ ) {
+			char ch = str.charAt( i );
+			if( ch == '(' )
+				nestLevel++;
+			else if( ch == ')' )
+				nestLevel--;
+			else if( nestLevel == 0 && ch == delim ) {
+				strs.add( str.substring( start, i ).trim() );
+				start = i + 1;
+			}
+		}
+		strs.add( str.substring( start ).trim() );
+
+		return strs;
+	}
+
+	/**
+	 * For use in LazyValue to get value for given key from UIManager and report error
+	 * if not found. If key is prefixed by '?', then no error is reported.
+	 */
+	private static Object lazyUIManagerGet( String uiKey ) {
+		boolean optional = false;
+		if( uiKey.startsWith( OPTIONAL_PREFIX ) ) {
+			uiKey = uiKey.substring( OPTIONAL_PREFIX.length() );
+			optional = true;
+		}
+
+		Object value = UIManager.get( uiKey );
+		if( value == null && !optional )
+			FlatLaf.LOG.log( Level.SEVERE, "FlatLaf: '" + uiKey + "' not found in UI defaults." );
+		return value;
+	}
+}

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

@@ -16,15 +16,18 @@
 
 package com.formdev.flatlaf.icons;
 
+import java.awt.BasicStroke;
 import java.awt.Color;
 import java.awt.Component;
 import java.awt.Graphics2D;
+import java.awt.geom.Path2D;
 import javax.swing.UIManager;
 import com.formdev.flatlaf.ui.FlatUIUtils;
 
 /**
  * "ascendingSort" icon for {@link javax.swing.table.JTableHeader}.
  *
+ * @uiDefault Component.arrowType				String	triangle (default) or chevron
  * @uiDefault Table.sortIconColor				Color
  *
  * @author Karl Tauber
@@ -32,6 +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 Color sortIconColor = UIManager.getColor( "Table.sortIconColor" );
 
 	public FlatAscendingSortIcon() {
@@ -41,6 +45,14 @@ public class FlatAscendingSortIcon
 	@Override
 	protected void paintIcon( Component c, Graphics2D g ) {
 		g.setColor( sortIconColor );
-		g.fill( FlatUIUtils.createPath( 0.5,5, 9.5,5, 5,0 ) );
+		if( chevron ) {
+			// chevron arrow
+			Path2D path = FlatUIUtils.createPath( false, 1,5, 5,1, 9,5 );
+			g.setStroke( new BasicStroke( 1f ) );
+			g.draw( path );
+		} else {
+			// triangle arrow
+			g.fill( FlatUIUtils.createPath( 0.5,5, 5,0, 9.5,5 ) );
+		}
 	}
 }

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

@@ -16,14 +16,18 @@
 
 package com.formdev.flatlaf.icons;
 
+import static com.formdev.flatlaf.FlatClientProperties.*;
 import java.awt.BasicStroke;
 import java.awt.Color;
 import java.awt.Component;
 import java.awt.Graphics2D;
 import java.awt.geom.Path2D;
+import java.awt.geom.RoundRectangle2D;
 import javax.swing.AbstractButton;
+import javax.swing.JComponent;
 import javax.swing.UIManager;
 import com.formdev.flatlaf.ui.FlatButtonUI;
+import com.formdev.flatlaf.ui.FlatUIUtils;
 
 /**
  * Icon for {@link javax.swing.JCheckBox}.
@@ -34,6 +38,7 @@ import com.formdev.flatlaf.ui.FlatButtonUI;
  *
  * @uiDefault Component.focusWidth						int
  * @uiDefault Component.focusColor						Color
+ * @uiDefault CheckBox.icon.focusedColor				Color	optional; defaults to Component.focusColor
  * @uiDefault CheckBox.icon.borderColor					Color
  * @uiDefault CheckBox.icon.disabledBorderColor			Color
  * @uiDefault CheckBox.icon.selectedBorderColor			Color
@@ -50,14 +55,17 @@ import com.formdev.flatlaf.ui.FlatButtonUI;
  * @uiDefault CheckBox.icon.selectedPressedBackground	Color	optional
  * @uiDefault CheckBox.icon.checkmarkColor				Color
  * @uiDefault CheckBox.icon.disabledCheckmarkColor		Color
+ * @uiDefault CheckBox.arc								int
  *
  * @author Karl Tauber
  */
 public class FlatCheckBoxIcon
 	extends FlatAbstractIcon
 {
-	protected final int focusWidth = UIManager.getInt( "Component.focusWidth" );
-	protected final Color focusColor = UIManager.getColor( "Component.focusColor" );
+	public final int focusWidth = UIManager.getInt( "Component.focusWidth" );
+	protected final Color focusColor = FlatUIUtils.getUIColor( "CheckBox.icon.focusedColor",
+		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" );
@@ -84,7 +92,8 @@ public class FlatCheckBoxIcon
 
 	@Override
 	protected void paintIcon( Component c, Graphics2D g2 ) {
-		boolean selected = (c instanceof AbstractButton) ? ((AbstractButton)c).isSelected() : false;
+		boolean indeterminate = c instanceof JComponent && clientPropertyEquals( (JComponent) c, SELECTED_STATE, SELECTED_STATE_INDETERMINATE );
+		boolean selected = indeterminate || (c instanceof AbstractButton && ((AbstractButton)c).isSelected());
 
 		// paint focused border
 		if( c.hasFocus() && focusWidth > 0 ) {
@@ -102,33 +111,40 @@ public class FlatCheckBoxIcon
 		paintBorder( g2 );
 
 		// paint background
-		g2.setColor( FlatButtonUI.buttonStateColor( c,
+		FlatUIUtils.setColor( g2, FlatButtonUI.buttonStateColor( c,
 			selected ? selectedBackground : background,
 			disabledBackground,
 			focusedBackground,
 			selected && selectedHoverBackground != null ? selectedHoverBackground : hoverBackground,
-			selected && selectedPressedBackground != null ? selectedPressedBackground : pressedBackground ) );
+			selected && selectedPressedBackground != null ? selectedPressedBackground : pressedBackground ),
+			background );
 		paintBackground( g2 );
 
 		// paint checkmark
-		if( selected ) {
+		if( selected || indeterminate ) {
 			g2.setColor( c.isEnabled() ? checkmarkColor : disabledCheckmarkColor );
-			paintCheckmark( g2 );
+			if( indeterminate )
+				paintIndeterminate( g2 );
+			else
+				paintCheckmark( g2 );
 		}
 	}
 
 	protected void paintFocusBorder( Graphics2D g2 ) {
 		// the outline focus border is painted outside of the icon
 		int wh = ICON_SIZE - 1 + (focusWidth * 2);
-		g2.fillRoundRect( -focusWidth + 1, -focusWidth, wh, wh, 8, 8 );
+		int arcwh = arc + (focusWidth * 2);
+		g2.fillRoundRect( -focusWidth + 1, -focusWidth, wh, wh, arcwh, arcwh );
 	}
 
 	protected void paintBorder( Graphics2D g2 ) {
-		g2.fillRoundRect( 1, 0, 14, 14, 4, 4 );
+		int arcwh = arc;
+		g2.fillRoundRect( 1, 0, 14, 14, arcwh, arcwh );
 	}
 
 	protected void paintBackground( Graphics2D g2 ) {
-		g2.fillRoundRect( 2, 1, 12, 12, 3, 3 );
+		int arcwh = arc - 1;
+		g2.fillRoundRect( 2, 1, 12, 12, arcwh, arcwh );
 	}
 
 	protected void paintCheckmark( Graphics2D g2 ) {
@@ -140,4 +156,8 @@ public class FlatCheckBoxIcon
 		g2.setStroke( new BasicStroke( 1.9f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND ) );
 		g2.draw( path );
 	}
+
+	protected void paintIndeterminate( Graphics2D g2 ) {
+		g2.fill( new RoundRectangle2D.Float( 3.75f, 5.75f, 8.5f, 2.5f, 2f, 2f ) );
+	}
 }

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

@@ -16,15 +16,18 @@
 
 package com.formdev.flatlaf.icons;
 
+import java.awt.BasicStroke;
 import java.awt.Color;
 import java.awt.Component;
 import java.awt.Graphics2D;
+import java.awt.geom.Path2D;
 import javax.swing.UIManager;
 import com.formdev.flatlaf.ui.FlatUIUtils;
 
 /**
  * "descendingSort" icon for {@link javax.swing.table.JTableHeader}.
  *
+ * @uiDefault Component.arrowType				String	triangle (default) or chevron
  * @uiDefault Table.sortIconColor				Color
  *
  * @author Karl Tauber
@@ -32,6 +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 Color sortIconColor = UIManager.getColor( "Table.sortIconColor" );
 
 	public FlatDescendingSortIcon() {
@@ -41,6 +45,14 @@ public class FlatDescendingSortIcon
 	@Override
 	protected void paintIcon( Component c, Graphics2D g ) {
 		g.setColor( sortIconColor );
-		g.fill( FlatUIUtils.createPath( 0.5,0, 9.5,0, 5,5 ) );
+		if( chevron ) {
+			// chevron arrow
+			Path2D path = FlatUIUtils.createPath( false, 1,1, 5,5, 9,1 );
+			g.setStroke( new BasicStroke( 1f ) );
+			g.draw( path );
+		} else {
+			// triangle arrow
+			g.fill( FlatUIUtils.createPath( 0.5,0, 5,5, 9.5,0 ) );
+		}
 	}
 }

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

@@ -23,7 +23,7 @@ import javax.swing.UIManager;
 /**
  * "details view" icon for {@link javax.swing.JFileChooser}.
  *
- * @uiDefault FileChooser.icon.detailsViewColor		Color
+ * @uiDefault Actions.Grey							Color
  *
  * @author Karl Tauber
  */
@@ -31,7 +31,7 @@ public class FlatFileChooserDetailsViewIcon
 	extends FlatAbstractIcon
 {
 	public FlatFileChooserDetailsViewIcon() {
-		super( 16, 16, UIManager.getColor( "FileChooser.icon.detailsViewColor" ) );
+		super( 16, 16, UIManager.getColor( "Actions.Grey" ) );
 	}
 
 	@Override

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

@@ -24,7 +24,7 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
 /**
  * "home folder" icon for {@link javax.swing.JFileChooser}.
  *
- * @uiDefault FileChooser.icon.homeFolderColor		Color
+ * @uiDefault Actions.Grey							Color
  *
  * @author Karl Tauber
  */
@@ -32,7 +32,7 @@ public class FlatFileChooserHomeFolderIcon
 	extends FlatAbstractIcon
 {
 	public FlatFileChooserHomeFolderIcon() {
-		super( 16, 16, UIManager.getColor( "FileChooser.icon.homeFolderColor" ) );
+		super( 16, 16, UIManager.getColor( "Actions.Grey" ) );
 	}
 
 	@Override

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

@@ -23,7 +23,7 @@ import javax.swing.UIManager;
 /**
  * "list view" icon for {@link javax.swing.JFileChooser}.
  *
- * @uiDefault FileChooser.icon.listViewColor		Color
+ * @uiDefault Actions.Grey							Color
  *
  * @author Karl Tauber
  */
@@ -31,7 +31,7 @@ public class FlatFileChooserListViewIcon
 	extends FlatAbstractIcon
 {
 	public FlatFileChooserListViewIcon() {
-		super( 16, 16, UIManager.getColor( "FileChooser.icon.listViewColor" ) );
+		super( 16, 16, UIManager.getColor( "Actions.Grey" ) );
 	}
 
 	@Override

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

@@ -24,7 +24,7 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
 /**
  * "new folder" icon for {@link javax.swing.JFileChooser}.
  *
- * @uiDefault FileChooser.icon.newFolderColor		Color
+ * @uiDefault Actions.Grey							Color
  *
  * @author Karl Tauber
  */
@@ -32,7 +32,7 @@ public class FlatFileChooserNewFolderIcon
 	extends FlatAbstractIcon
 {
 	public FlatFileChooserNewFolderIcon() {
-		super( 16, 16, UIManager.getColor( "FileChooser.icon.newFolderColor" ) );
+		super( 16, 16, UIManager.getColor( "Actions.Grey" ) );
 	}
 
 	@Override

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

@@ -16,6 +16,7 @@
 
 package com.formdev.flatlaf.icons;
 
+import java.awt.Color;
 import java.awt.Component;
 import java.awt.Graphics2D;
 import javax.swing.UIManager;
@@ -24,15 +25,18 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
 /**
  * "up folder" icon for {@link javax.swing.JFileChooser}.
  *
- * @uiDefault FileChooser.icon.upFolderColor		Color
+ * @uiDefault Actions.Grey							Color
+ * @uiDefault Actions.Blue							Color
  *
  * @author Karl Tauber
  */
 public class FlatFileChooserUpFolderIcon
 	extends FlatAbstractIcon
 {
+	private final Color blueColor = UIManager.getColor( "Actions.Blue" );
+
 	public FlatFileChooserUpFolderIcon() {
-		super( 16, 16, UIManager.getColor( "FileChooser.icon.upFolderColor" ) );
+		super( 16, 16, UIManager.getColor( "Actions.Grey" ) );
 	}
 
 	@Override
@@ -47,6 +51,8 @@ public class FlatFileChooserUpFolderIcon
 		*/
 
 		g.fill( FlatUIUtils.createPath( 2,3, 5.5,3, 7,5, 9,5, 9,9, 13,9, 13,5, 14,5, 14,13, 2,13 ) );
+
+		g.setColor( blueColor );
 		g.fill( FlatUIUtils.createPath( 12,4, 12,8, 10,8, 10,4, 8,4, 11,1, 14,4, 12,4 ) );
 	}
 }

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

@@ -25,7 +25,7 @@ import javax.swing.UIManager;
 /**
  * "computer" icon for {@link javax.swing.JFileChooser}.
  *
- * @uiDefault FileView.icon.computerColor		Color
+ * @uiDefault Objects.Grey						Color
  *
  * @author Karl Tauber
  */
@@ -33,7 +33,7 @@ public class FlatFileViewComputerIcon
 	extends FlatAbstractIcon
 {
 	public FlatFileViewComputerIcon() {
-		super( 16, 16, UIManager.getColor( "FileView.icon.computerColor" ) );
+		super( 16, 16, UIManager.getColor( "Objects.Grey" ) );
 	}
 
 	@Override

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

@@ -24,7 +24,7 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
 /**
  * "directory" icon for {@link javax.swing.JFileChooser}.
  *
- * @uiDefault FileView.icon.directoryColor		Color
+ * @uiDefault Objects.Grey						Color
  *
  * @author Karl Tauber
  */
@@ -32,7 +32,7 @@ public class FlatFileViewDirectoryIcon
 	extends FlatAbstractIcon
 {
 	public FlatFileViewDirectoryIcon() {
-		super( 16, 16, UIManager.getColor( "FileView.icon.directoryColor" ) );
+		super( 16, 16, UIManager.getColor( "Objects.Grey" ) );
 	}
 
 	@Override

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

@@ -24,7 +24,7 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
 /**
  * "file" icon for {@link javax.swing.JFileChooser}.
  *
- * @uiDefault FileView.icon.fileColor			Color
+ * @uiDefault Objects.Grey						Color
  *
  * @author Karl Tauber
  */
@@ -32,7 +32,7 @@ public class FlatFileViewFileIcon
 	extends FlatAbstractIcon
 {
 	public FlatFileViewFileIcon() {
-		super( 16, 16, UIManager.getColor( "FileView.icon.fileColor" ) );
+		super( 16, 16, UIManager.getColor( "Objects.Grey" ) );
 	}
 
 	@Override

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

@@ -25,7 +25,7 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
 /**
  * "floppy drive" icon for {@link javax.swing.JFileChooser}.
  *
- * @uiDefault FileView.icon.floppyDriveColor		Color
+ * @uiDefault Objects.Grey							Color
  *
  * @author Karl Tauber
  */
@@ -33,7 +33,7 @@ public class FlatFileViewFloppyDriveIcon
 	extends FlatAbstractIcon
 {
 	public FlatFileViewFloppyDriveIcon() {
-		super( 16, 16, UIManager.getColor( "FileView.icon.floppyDriveColor" ) );
+		super( 16, 16, UIManager.getColor( "Objects.Grey" ) );
 	}
 
 	@Override

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

@@ -25,7 +25,7 @@ import javax.swing.UIManager;
 /**
  * "hard drive" icon for {@link javax.swing.JFileChooser}.
  *
- * @uiDefault FileView.icon.hardDriveColor		Color
+ * @uiDefault Objects.Grey						Color
  *
  * @author Karl Tauber
  */
@@ -33,7 +33,7 @@ public class FlatFileViewHardDriveIcon
 	extends FlatAbstractIcon
 {
 	public FlatFileViewHardDriveIcon() {
-		super( 16, 16, UIManager.getColor( "FileView.icon.hardDriveColor" ) );
+		super( 16, 16, UIManager.getColor( "Objects.Grey" ) );
 	}
 
 	@Override

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

@@ -24,6 +24,7 @@ import java.awt.geom.Ellipse2D;
 import java.awt.geom.Path2D;
 import javax.swing.UIManager;
 import com.formdev.flatlaf.ui.FlatButtonUI;
+import com.formdev.flatlaf.ui.FlatUIUtils;
 
 /**
  * Help button icon for {@link javax.swing.JButton}.
@@ -99,12 +100,12 @@ public class FlatHelpButtonIcon
 		g2.fill( new Ellipse2D.Float( focusWidth + 0.5f, focusWidth + 0.5f, 21, 21 ) );
 
 		// paint background
-		g2.setColor( FlatButtonUI.buttonStateColor( c,
+		FlatUIUtils.setColor( g2, FlatButtonUI.buttonStateColor( c,
 			background,
 			disabledBackground,
 			focusedBackground,
 			hoverBackground,
-			pressedBackground ) );
+			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/FlatInternalFrameCloseIcon.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright 2019 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
+ *
+ *     http://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.Component;
+import java.awt.Graphics2D;
+import java.awt.geom.Line2D;
+import java.awt.geom.Path2D;
+import javax.swing.UIManager;
+
+/**
+ * "close" icon for {@link javax.swing.JInternalFrame}.
+ *
+ * @uiDefault InternalFrame.iconColor			Color
+ *
+ * @author Karl Tauber
+ */
+public class FlatInternalFrameCloseIcon
+	extends FlatAbstractIcon
+{
+	public FlatInternalFrameCloseIcon() {
+		super( 16, 16, UIManager.getColor( "InternalFrame.iconColor" ) );
+	}
+
+	@Override
+	protected void paintIcon( Component c, Graphics2D g ) {
+		float mx = 8;
+		float my = 8;
+		float r = 3.25f;
+
+		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( 1f ) );
+		g.draw( path );
+	}
+}

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

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2019 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
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.icons;
+
+import java.awt.Component;
+import java.awt.Graphics2D;
+import javax.swing.UIManager;
+
+/**
+ * "iconify" icon for {@link javax.swing.JInternalFrame}.
+ *
+ * @uiDefault InternalFrame.iconColor			Color
+ *
+ * @author Karl Tauber
+ */
+public class FlatInternalFrameIconifyIcon
+	extends FlatAbstractIcon
+{
+	public FlatInternalFrameIconifyIcon() {
+		super( 16, 16, UIManager.getColor( "InternalFrame.iconColor" ) );
+	}
+
+	@Override
+	protected void paintIcon( Component c, Graphics2D g ) {
+		g.fillRect( 3, 8, 10, 1 );
+	}
+}

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

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2019 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
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.icons;
+
+import java.awt.Component;
+import java.awt.Graphics2D;
+import javax.swing.UIManager;
+import com.formdev.flatlaf.ui.FlatUIUtils;
+
+/**
+ * "maximize" icon for {@link javax.swing.JInternalFrame}.
+ *
+ * @uiDefault InternalFrame.iconColor			Color
+ *
+ * @author Karl Tauber
+ */
+public class FlatInternalFrameMaximizeIcon
+	extends FlatAbstractIcon
+{
+	public FlatInternalFrameMaximizeIcon() {
+		super( 16, 16, UIManager.getColor( "InternalFrame.iconColor" ) );
+	}
+
+	@Override
+	protected void paintIcon( Component c, Graphics2D g ) {
+		g.fill( FlatUIUtils.createRectangle( 3, 3, 10, 10, 1 ) );
+	}
+}

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

@@ -0,0 +1,52 @@
+/*
+ * Copyright 2019 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
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.icons;
+
+import java.awt.Component;
+import java.awt.Graphics2D;
+import java.awt.geom.Area;
+import java.awt.geom.Path2D;
+import java.awt.geom.Rectangle2D;
+import javax.swing.UIManager;
+import com.formdev.flatlaf.ui.FlatUIUtils;
+
+/**
+ * "minimize" (actually "restore") icon for {@link javax.swing.JInternalFrame}.
+ *
+ * @uiDefault InternalFrame.iconColor			Color
+ *
+ * @author Karl Tauber
+ */
+public class FlatInternalFrameMinimizeIcon
+	extends FlatAbstractIcon
+{
+	public FlatInternalFrameMinimizeIcon() {
+		super( 16, 16, UIManager.getColor( "InternalFrame.iconColor" ) );
+	}
+
+	@Override
+	protected void paintIcon( Component c, Graphics2D g ) {
+		Path2D r1 = FlatUIUtils.createRectangle( 5, 3, 8, 8, 1 );
+		Path2D r2 = FlatUIUtils.createRectangle( 3, 5, 8, 8, 1 );
+
+		Area area = new Area( r1 );
+		area.subtract( new Area( new Rectangle2D.Float( 3, 5, 8, 8 ) ) );
+		g.fill( area );
+
+		g.fill( r2 );
+	}
+}

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

@@ -60,7 +60,7 @@ public class FlatMenuArrowIcon
 			g.draw( path );
 		} else {
 			// triangle arrow
-			g.fill( FlatUIUtils.createPath( 0,0.5, 0,9.5, 5,5 ) );
+			g.fill( FlatUIUtils.createPath( 0,0.5, 5,5, 0,9.5 ) );
 		}
 	}
 

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

@@ -22,11 +22,12 @@ import java.awt.Graphics2D;
 import java.awt.Shape;
 import java.awt.geom.Path2D;
 import javax.swing.UIManager;
+import com.formdev.flatlaf.ui.FlatUIUtils;
 
 /**
  * Base class for icons for {@link javax.swing.JOptionPane}.
  *
- * @uiDefault OptionPane.icon.foreground			Color
+ * @uiDefault OptionPane.icon.foreground			Color	default is transparent
  *
  * @author Karl Tauber
  */
@@ -35,8 +36,8 @@ public abstract class FlatOptionPaneAbstractIcon
 {
 	protected final Color foreground = UIManager.getColor( "OptionPane.icon.foreground" );
 
-	protected FlatOptionPaneAbstractIcon( String colorKey ) {
-		super( 32, 32, UIManager.getColor( colorKey ) );
+	protected FlatOptionPaneAbstractIcon( String colorKey, String defaultColorKey ) {
+		super( 32, 32, FlatUIUtils.getUIColor( colorKey, defaultColorKey ) );
 	}
 
 	@Override

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

@@ -24,7 +24,8 @@ import java.awt.geom.Rectangle2D;
 /**
  * "Error" icon for {@link javax.swing.JOptionPane}.
  *
- * @uiDefault OptionPane.icon.errorColor			Color
+ * @uiDefault OptionPane.icon.errorColor			Color	optional; defaults to Actions.Red
+ * @uiDefault Actions.Red							Color
  *
  * @author Karl Tauber
  */
@@ -32,7 +33,7 @@ public class FlatOptionPaneErrorIcon
 	extends FlatOptionPaneAbstractIcon
 {
 	public FlatOptionPaneErrorIcon() {
-		super( "OptionPane.icon.errorColor" );
+		super( "OptionPane.icon.errorColor", "Actions.Red" );
 	}
 
 	/*

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

@@ -24,7 +24,8 @@ import java.awt.geom.Rectangle2D;
 /**
  * "Information" icon for {@link javax.swing.JOptionPane}.
  *
- * @uiDefault OptionPane.icon.informationColor		Color
+ * @uiDefault OptionPane.icon.informationColor		Color	optional; defaults to Actions.Blue
+ * @uiDefault Actions.Blue							Color
  *
  * @author Karl Tauber
  */
@@ -32,7 +33,7 @@ public class FlatOptionPaneInformationIcon
 	extends FlatOptionPaneAbstractIcon
 {
 	public FlatOptionPaneInformationIcon() {
-		super( "OptionPane.icon.informationColor" );
+		super( "OptionPane.icon.informationColor", "Actions.Blue" );
 	}
 
 	/*

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

@@ -24,7 +24,8 @@ import java.awt.geom.Rectangle2D;
 /**
  * "Question" icon for {@link javax.swing.JOptionPane}.
  *
- * @uiDefault OptionPane.icon.questionColor			Color
+ * @uiDefault OptionPane.icon.questionColor			Color	optional; defaults to Actions.Blue
+ * @uiDefault Actions.Blue							Color
  *
  * @author Karl Tauber
  */
@@ -32,7 +33,7 @@ public class FlatOptionPaneQuestionIcon
 	extends FlatOptionPaneAbstractIcon
 {
 	public FlatOptionPaneQuestionIcon() {
-		super( "OptionPane.icon.questionColor" );
+		super( "OptionPane.icon.questionColor", "Actions.Blue" );
 	}
 
 	/*

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

@@ -24,7 +24,8 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
 /**
  * "Warning" icon for {@link javax.swing.JOptionPane}.
  *
- * @uiDefault OptionPane.icon.warningColor			Color
+ * @uiDefault OptionPane.icon.warningColor			Color	optional; defaults to Actions.Yellow
+ * @uiDefault Actions.Yellow						Color
  *
  * @author Karl Tauber
  */
@@ -32,7 +33,7 @@ public class FlatOptionPaneWarningIcon
 	extends FlatOptionPaneAbstractIcon
 {
 	public FlatOptionPaneWarningIcon() {
-		super( "OptionPane.icon.warningColor" );
+		super( "OptionPane.icon.warningColor", "Actions.Yellow" );
 	}
 
 	/*

flatlaf-core/src/main/java/com/formdev/flatlaf/json/Json.java

@@ -0,0 +1,100 @@
+/*
+ * Copyright 2019 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
+ *
+ *     http://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.json;
+
+import java.io.IOException;
+import java.io.Reader;
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * @author Karl Tauber
+ */
+public class Json
+{
+	public static Object parse( Reader reader )
+		throws IOException, ParseException
+	{
+		DefaultHandler handler = new DefaultHandler();
+		new JsonParser( handler ).parse( reader );
+		return handler.getValue();
+	}
+
+	//---- class DefaultHandler -----------------------------------------------
+
+	static class DefaultHandler
+		extends JsonHandler<List<Object>, Map<String, Object>>
+	{
+		private Object value;
+
+		@Override
+		public List<Object> startArray() {
+			return new ArrayList<>();
+		}
+
+		@Override
+		public Map<String, Object> startObject() {
+			return new LinkedHashMap<>();
+		}
+
+		@Override
+		public void endNull() {
+			value = "null";
+		}
+
+		@Override
+		public void endBoolean( boolean bool ) {
+			value = bool ? "true" : "false";
+		}
+
+		@Override
+		public void endString( String string ) {
+			value = string;
+		}
+
+		@Override
+		public void endNumber( String string ) {
+			value = string;
+		}
+
+		@Override
+		public void endArray( List<Object> array ) {
+			value = array;
+		}
+
+		@Override
+		public void endObject( Map<String, Object> object ) {
+			value = object;
+		}
+
+		@Override
+		public void endArrayValue( List<Object> array ) {
+			array.add( value );
+		}
+
+		@Override
+		public void endObjectValue( Map<String, Object> object, String name ) {
+			object.put( name, value );
+		}
+
+		Object getValue() {
+			return value;
+		}
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/json/JsonHandler.java

@@ -0,0 +1,266 @@
+/*******************************************************************************
+ * Copyright (c) 2016 EclipseSource.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ ******************************************************************************/
+
+// from https://github.com/ralfstx/minimal-json
+
+package com.formdev.flatlaf.json;
+
+
+/**
+ * A handler for parser events. Instances of this class can be given to a {@link JsonParser}. The
+ * parser will then call the methods of the given handler while reading the input.
+ * <p>
+ * The default implementations of these methods do nothing. Subclasses may override only those
+ * methods they are interested in. They can use <code>getLocation()</code> to access the current
+ * character position of the parser at any point. The <code>start*</code> methods will be called
+ * while the location points to the first character of the parsed element. The <code>end*</code>
+ * methods will be called while the location points to the character position that directly follows
+ * the last character of the parsed element. Example:
+ * </p>
+ *
+ * <pre>
+ * ["lorem ipsum"]
+ *  ^            ^
+ *  startString  endString
+ * </pre>
+ * <p>
+ * Subclasses that build an object representation of the parsed JSON can return arbitrary handler
+ * objects for JSON arrays and JSON objects in {@link #startArray()} and {@link #startObject()}.
+ * These handler objects will then be provided in all subsequent parser events for this particular
+ * array or object. They can be used to keep track the elements of a JSON array or object.
+ * </p>
+ *
+ * @param <A>
+ *          The type of handlers used for JSON arrays
+ * @param <O>
+ *          The type of handlers used for JSON objects
+ * @see JsonParser
+ */
+abstract class JsonHandler<A, O> {
+
+  JsonParser parser;
+
+  /**
+   * Returns the current parser location.
+   *
+   * @return the current parser location
+   */
+  protected Location getLocation() {
+    return parser.getLocation();
+  }
+
+  /**
+   * Indicates the beginning of a <code>null</code> literal in the JSON input. This method will be
+   * called when reading the first character of the literal.
+   */
+  public void startNull() {
+  }
+
+  /**
+   * Indicates the end of a <code>null</code> literal in the JSON input. This method will be called
+   * after reading the last character of the literal.
+   */
+  public void endNull() {
+  }
+
+  /**
+   * Indicates the beginning of a boolean literal (<code>true</code> or <code>false</code>) in the
+   * JSON input. This method will be called when reading the first character of the literal.
+   */
+  public void startBoolean() {
+  }
+
+  /**
+   * Indicates the end of a boolean literal (<code>true</code> or <code>false</code>) in the JSON
+   * input. This method will be called after reading the last character of the literal.
+   *
+   * @param value
+   *          the parsed boolean value
+   */
+  public void endBoolean(boolean value) {
+  }
+
+  /**
+   * Indicates the beginning of a string in the JSON input. This method will be called when reading
+   * the opening double quote character (<code>'&quot;'</code>).
+   */
+  public void startString() {
+  }
+
+  /**
+   * Indicates the end of a string in the JSON input. This method will be called after reading the
+   * closing double quote character (<code>'&quot;'</code>).
+   *
+   * @param string
+   *          the parsed string
+   */
+  public void endString(String string) {
+  }
+
+  /**
+   * Indicates the beginning of a number in the JSON input. This method will be called when reading
+   * the first character of the number.
+   */
+  public void startNumber() {
+  }
+
+  /**
+   * Indicates the end of a number in the JSON input. This method will be called after reading the
+   * last character of the number.
+   *
+   * @param string
+   *          the parsed number string
+   */
+  public void endNumber(String string) {
+  }
+
+  /**
+   * Indicates the beginning of an array in the JSON input. This method will be called when reading
+   * the opening square bracket character (<code>'['</code>).
+   * <p>
+   * This method may return an object to handle subsequent parser events for this array. This array
+   * handler will then be provided in all calls to {@link #startArrayValue(Object)
+   * startArrayValue()}, {@link #endArrayValue(Object) endArrayValue()}, and
+   * {@link #endArray(Object) endArray()} for this array.
+   * </p>
+   *
+   * @return a handler for this array, or <code>null</code> if not needed
+   */
+  public A startArray() {
+    return null;
+  }
+
+  /**
+   * Indicates the end of an array in the JSON input. This method will be called after reading the
+   * closing square bracket character (<code>']'</code>).
+   *
+   * @param array
+   *          the array handler returned from {@link #startArray()}, or <code>null</code> if not
+   *          provided
+   */
+  public void endArray(A array) {
+  }
+
+  /**
+   * Indicates the beginning of an array element in the JSON input. This method will be called when
+   * reading the first character of the element, just before the call to the <code>start</code>
+   * method for the specific element type ({@link #startString()}, {@link #startNumber()}, etc.).
+   *
+   * @param array
+   *          the array handler returned from {@link #startArray()}, or <code>null</code> if not
+   *          provided
+   */
+  public void startArrayValue(A array) {
+  }
+
+  /**
+   * Indicates the end of an array element in the JSON input. This method will be called after
+   * reading the last character of the element value, just after the <code>end</code> method for the
+   * specific element type (like {@link #endString(String) endString()}, {@link #endNumber(String)
+   * endNumber()}, etc.).
+   *
+   * @param array
+   *          the array handler returned from {@link #startArray()}, or <code>null</code> if not
+   *          provided
+   */
+  public void endArrayValue(A array) {
+  }
+
+  /**
+   * Indicates the beginning of an object in the JSON input. This method will be called when reading
+   * the opening curly bracket character (<code>'{'</code>).
+   * <p>
+   * This method may return an object to handle subsequent parser events for this object. This
+   * object handler will be provided in all calls to {@link #startObjectName(Object)
+   * startObjectName()}, {@link #endObjectName(Object, String) endObjectName()},
+   * {@link #startObjectValue(Object, String) startObjectValue()},
+   * {@link #endObjectValue(Object, String) endObjectValue()}, and {@link #endObject(Object)
+   * endObject()} for this object.
+   * </p>
+   *
+   * @return a handler for this object, or <code>null</code> if not needed
+   */
+  public O startObject() {
+    return null;
+  }
+
+  /**
+   * Indicates the end of an object in the JSON input. This method will be called after reading the
+   * closing curly bracket character (<code>'}'</code>).
+   *
+   * @param object
+   *          the object handler returned from {@link #startObject()}, or null if not provided
+   */
+  public void endObject(O object) {
+  }
+
+  /**
+   * Indicates the beginning of the name of an object member in the JSON input. This method will be
+   * called when reading the opening quote character ('&quot;') of the member name.
+   *
+   * @param object
+   *          the object handler returned from {@link #startObject()}, or <code>null</code> if not
+   *          provided
+   */
+  public void startObjectName(O object) {
+  }
+
+  /**
+   * Indicates the end of an object member name in the JSON input. This method will be called after
+   * reading the closing quote character (<code>'"'</code>) of the member name.
+   *
+   * @param object
+   *          the object handler returned from {@link #startObject()}, or null if not provided
+   * @param name
+   *          the parsed member name
+   */
+  public void endObjectName(O object, String name) {
+  }
+
+  /**
+   * Indicates the beginning of the name of an object member in the JSON input. This method will be
+   * called when reading the opening quote character ('&quot;') of the member name.
+   *
+   * @param object
+   *          the object handler returned from {@link #startObject()}, or <code>null</code> if not
+   *          provided
+   * @param name
+   *          the member name
+   */
+  public void startObjectValue(O object, String name) {
+  }
+
+  /**
+   * Indicates the end of an object member value in the JSON input. This method will be called after
+   * reading the last character of the member value, just after the <code>end</code> method for the
+   * specific member type (like {@link #endString(String) endString()}, {@link #endNumber(String)
+   * endNumber()}, etc.).
+   *
+   * @param object
+   *          the object handler returned from {@link #startObject()}, or null if not provided
+   * @param name
+   *          the parsed member name
+   */
+  public void endObjectValue(O object, String name) {
+  }
+
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/json/JsonParser.java

@@ -0,0 +1,514 @@
+/*******************************************************************************
+ * Copyright (c) 2013, 2016 EclipseSource.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ ******************************************************************************/
+
+// from https://github.com/ralfstx/minimal-json
+
+package com.formdev.flatlaf.json;
+
+import java.io.IOException;
+import java.io.Reader;
+import java.io.StringReader;
+
+
+/**
+ * A streaming parser for JSON text. The parser reports all events to a given handler.
+ */
+class JsonParser {
+
+  private static final int MAX_NESTING_LEVEL = 1000;
+  private static final int MIN_BUFFER_SIZE = 10;
+  private static final int DEFAULT_BUFFER_SIZE = 1024;
+
+  private final JsonHandler<Object, Object> handler;
+  private Reader reader;
+  private char[] buffer;
+  private int bufferOffset;
+  private int index;
+  private int fill;
+  private int line;
+  private int lineOffset;
+  private int current;
+  private StringBuilder captureBuffer;
+  private int captureStart;
+  private int nestingLevel;
+
+  /*
+   * |                      bufferOffset
+   *                        v
+   * [a|b|c|d|e|f|g|h|i|j|k|l|m|n|o|p|q|r|s|t]        < input
+   *                       [l|m|n|o|p|q|r|s|t|?|?]    < buffer
+   *                          ^               ^
+   *                       |  index           fill
+   */
+
+  /**
+   * Creates a new JsonParser with the given handler. The parser will report all parser events to
+   * this handler.
+   *
+   * @param handler
+   *          the handler to process parser events
+   */
+  @SuppressWarnings("unchecked")
+  public JsonParser(JsonHandler<?, ?> handler) {
+    if (handler == null) {
+      throw new NullPointerException("handler is null");
+    }
+    this.handler = (JsonHandler<Object, Object>)handler;
+    handler.parser = this;
+  }
+
+  /**
+   * Parses the given input string. The input must contain a valid JSON value, optionally padded
+   * with whitespace.
+   *
+   * @param string
+   *          the input string, must be valid JSON
+   * @throws ParseException
+   *           if the input is not valid JSON
+   */
+  public void parse(String string) {
+    if (string == null) {
+      throw new NullPointerException("string is null");
+    }
+    int bufferSize = Math.max(MIN_BUFFER_SIZE, Math.min(DEFAULT_BUFFER_SIZE, string.length()));
+    try {
+      parse(new StringReader(string), bufferSize);
+    } catch (IOException exception) {
+      // StringReader does not throw IOException
+      throw new RuntimeException(exception);
+    }
+  }
+
+  /**
+   * Reads the entire input from the given reader and parses it as JSON. The input must contain a
+   * valid JSON value, optionally padded with whitespace.
+   * <p>
+   * Characters are read in chunks into a default-sized input buffer. Hence, wrapping a reader in an
+   * additional <code>BufferedReader</code> likely won't improve reading performance.
+   * </p>
+   *
+   * @param reader
+   *          the reader to read the input from
+   * @throws IOException
+   *           if an I/O error occurs in the reader
+   * @throws ParseException
+   *           if the input is not valid JSON
+   */
+  public void parse(Reader reader) throws IOException {
+    parse(reader, DEFAULT_BUFFER_SIZE);
+  }
+
+  /**
+   * Reads the entire input from the given reader and parses it as JSON. The input must contain a
+   * valid JSON value, optionally padded with whitespace.
+   * <p>
+   * Characters are read in chunks into an input buffer of the given size. Hence, wrapping a reader
+   * in an additional <code>BufferedReader</code> likely won't improve reading performance.
+   * </p>
+   *
+   * @param reader
+   *          the reader to read the input from
+   * @param buffersize
+   *          the size of the input buffer in chars
+   * @throws IOException
+   *           if an I/O error occurs in the reader
+   * @throws ParseException
+   *           if the input is not valid JSON
+   */
+  public void parse(Reader reader, int buffersize) throws IOException {
+    if (reader == null) {
+      throw new NullPointerException("reader is null");
+    }
+    if (buffersize <= 0) {
+      throw new IllegalArgumentException("buffersize is zero or negative");
+    }
+    this.reader = reader;
+    buffer = new char[buffersize];
+    bufferOffset = 0;
+    index = 0;
+    fill = 0;
+    line = 1;
+    lineOffset = 0;
+    current = 0;
+    captureStart = -1;
+    read();
+    skipWhiteSpace();
+    readValue();
+    skipWhiteSpace();
+    if (!isEndOfText()) {
+      throw error("Unexpected character");
+    }
+  }
+
+  private void readValue() throws IOException {
+    switch (current) {
+      case 'n':
+        readNull();
+        break;
+      case 't':
+        readTrue();
+        break;
+      case 'f':
+        readFalse();
+        break;
+      case '"':
+        readString();
+        break;
+      case '[':
+        readArray();
+        break;
+      case '{':
+        readObject();
+        break;
+      case '-':
+      case '0':
+      case '1':
+      case '2':
+      case '3':
+      case '4':
+      case '5':
+      case '6':
+      case '7':
+      case '8':
+      case '9':
+        readNumber();
+        break;
+      default:
+        throw expected("value");
+    }
+  }
+
+  private void readArray() throws IOException {
+    Object array = handler.startArray();
+    read();
+    if (++nestingLevel > MAX_NESTING_LEVEL) {
+      throw error("Nesting too deep");
+    }
+    skipWhiteSpace();
+    if (readChar(']')) {
+      nestingLevel--;
+      handler.endArray(array);
+      return;
+    }
+    do {
+      skipWhiteSpace();
+      handler.startArrayValue(array);
+      readValue();
+      handler.endArrayValue(array);
+      skipWhiteSpace();
+    } while (readChar(','));
+    if (!readChar(']')) {
+      throw expected("',' or ']'");
+    }
+    nestingLevel--;
+    handler.endArray(array);
+  }
+
+  private void readObject() throws IOException {
+    Object object = handler.startObject();
+    read();
+    if (++nestingLevel > MAX_NESTING_LEVEL) {
+      throw error("Nesting too deep");
+    }
+    skipWhiteSpace();
+    if (readChar('}')) {
+      nestingLevel--;
+      handler.endObject(object);
+      return;
+    }
+    do {
+      skipWhiteSpace();
+      handler.startObjectName(object);
+      String name = readName();
+      handler.endObjectName(object, name);
+      skipWhiteSpace();
+      if (!readChar(':')) {
+        throw expected("':'");
+      }
+      skipWhiteSpace();
+      handler.startObjectValue(object, name);
+      readValue();
+      handler.endObjectValue(object, name);
+      skipWhiteSpace();
+    } while (readChar(','));
+    if (!readChar('}')) {
+      throw expected("',' or '}'");
+    }
+    nestingLevel--;
+    handler.endObject(object);
+  }
+
+  private String readName() throws IOException {
+    if (current != '"') {
+      throw expected("name");
+    }
+    return readStringInternal();
+  }
+
+  private void readNull() throws IOException {
+    handler.startNull();
+    read();
+    readRequiredChar('u');
+    readRequiredChar('l');
+    readRequiredChar('l');
+    handler.endNull();
+  }
+
+  private void readTrue() throws IOException {
+    handler.startBoolean();
+    read();
+    readRequiredChar('r');
+    readRequiredChar('u');
+    readRequiredChar('e');
+    handler.endBoolean(true);
+  }
+
+  private void readFalse() throws IOException {
+    handler.startBoolean();
+    read();
+    readRequiredChar('a');
+    readRequiredChar('l');
+    readRequiredChar('s');
+    readRequiredChar('e');
+    handler.endBoolean(false);
+  }
+
+  private void readRequiredChar(char ch) throws IOException {
+    if (!readChar(ch)) {
+      throw expected("'" + ch + "'");
+    }
+  }
+
+  private void readString() throws IOException {
+    handler.startString();
+    handler.endString(readStringInternal());
+  }
+
+  private String readStringInternal() throws IOException {
+    read();
+    startCapture();
+    while (current != '"') {
+      if (current == '\\') {
+        pauseCapture();
+        readEscape();
+        startCapture();
+      } else if (current < 0x20) {
+        throw expected("valid string character");
+      } else {
+        read();
+      }
+    }
+    String string = endCapture();
+    read();
+    return string;
+  }
+
+  private void readEscape() throws IOException {
+    read();
+    switch (current) {
+      case '"':
+      case '/':
+      case '\\':
+        captureBuffer.append((char)current);
+        break;
+      case 'b':
+        captureBuffer.append('\b');
+        break;
+      case 'f':
+        captureBuffer.append('\f');
+        break;
+      case 'n':
+        captureBuffer.append('\n');
+        break;
+      case 'r':
+        captureBuffer.append('\r');
+        break;
+      case 't':
+        captureBuffer.append('\t');
+        break;
+      case 'u':
+        char[] hexChars = new char[4];
+        for (int i = 0; i < 4; i++) {
+          read();
+          if (!isHexDigit()) {
+            throw expected("hexadecimal digit");
+          }
+          hexChars[i] = (char)current;
+        }
+        captureBuffer.append((char)Integer.parseInt(new String(hexChars), 16));
+        break;
+      default:
+        throw expected("valid escape sequence");
+    }
+    read();
+  }
+
+  private void readNumber() throws IOException {
+    handler.startNumber();
+    startCapture();
+    readChar('-');
+    int firstDigit = current;
+    if (!readDigit()) {
+      throw expected("digit");
+    }
+    if (firstDigit != '0') {
+      while (readDigit()) {
+      }
+    }
+    readFraction();
+    readExponent();
+    handler.endNumber(endCapture());
+  }
+
+  private boolean readFraction() throws IOException {
+    if (!readChar('.')) {
+      return false;
+    }
+    if (!readDigit()) {
+      throw expected("digit");
+    }
+    while (readDigit()) {
+    }
+    return true;
+  }
+
+  private boolean readExponent() throws IOException {
+    if (!readChar('e') && !readChar('E')) {
+      return false;
+    }
+    if (!readChar('+')) {
+      readChar('-');
+    }
+    if (!readDigit()) {
+      throw expected("digit");
+    }
+    while (readDigit()) {
+    }
+    return true;
+  }
+
+  private boolean readChar(char ch) throws IOException {
+    if (current != ch) {
+      return false;
+    }
+    read();
+    return true;
+  }
+
+  private boolean readDigit() throws IOException {
+    if (!isDigit()) {
+      return false;
+    }
+    read();
+    return true;
+  }
+
+  private void skipWhiteSpace() throws IOException {
+    while (isWhiteSpace()) {
+      read();
+    }
+  }
+
+  private void read() throws IOException {
+    if (index == fill) {
+      if (captureStart != -1) {
+        captureBuffer.append(buffer, captureStart, fill - captureStart);
+        captureStart = 0;
+      }
+      bufferOffset += fill;
+      fill = reader.read(buffer, 0, buffer.length);
+      index = 0;
+      if (fill == -1) {
+        current = -1;
+        index++;
+        return;
+      }
+    }
+    if (current == '\n') {
+      line++;
+      lineOffset = bufferOffset + index;
+    }
+    current = buffer[index++];
+  }
+
+  private void startCapture() {
+    if (captureBuffer == null) {
+      captureBuffer = new StringBuilder();
+    }
+    captureStart = index - 1;
+  }
+
+  private void pauseCapture() {
+    int end = current == -1 ? index : index - 1;
+    captureBuffer.append(buffer, captureStart, end - captureStart);
+    captureStart = -1;
+  }
+
+  private String endCapture() {
+    int start = captureStart;
+    int end = index - 1;
+    captureStart = -1;
+    if (captureBuffer.length() > 0) {
+      captureBuffer.append(buffer, start, end - start);
+      String captured = captureBuffer.toString();
+      captureBuffer.setLength(0);
+      return captured;
+    }
+    return new String(buffer, start, end - start);
+  }
+
+  Location getLocation() {
+    int offset = bufferOffset + index - 1;
+    int column = offset - lineOffset + 1;
+    return new Location(offset, line, column);
+  }
+
+  private ParseException expected(String expected) {
+    if (isEndOfText()) {
+      return error("Unexpected end of input");
+    }
+    return error("Expected " + expected);
+  }
+
+  private ParseException error(String message) {
+    return new ParseException(message, getLocation());
+  }
+
+  private boolean isWhiteSpace() {
+    return current == ' ' || current == '\t' || current == '\n' || current == '\r';
+  }
+
+  private boolean isDigit() {
+    return current >= '0' && current <= '9';
+  }
+
+  private boolean isHexDigit() {
+    return current >= '0' && current <= '9'
+        || current >= 'a' && current <= 'f'
+        || current >= 'A' && current <= 'F';
+  }
+
+  private boolean isEndOfText() {
+    return current == -1;
+  }
+
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/json/Location.java

@@ -0,0 +1,79 @@
+/*******************************************************************************
+ * Copyright (c) 2016 EclipseSource.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ ******************************************************************************/
+
+// from https://github.com/ralfstx/minimal-json
+
+package com.formdev.flatlaf.json;
+
+
+/**
+ * An immutable object that represents a location in the parsed text.
+ */
+public class Location {
+
+  /**
+   * The absolute character index, starting at 0.
+   */
+  public final int offset;
+
+  /**
+   * The line number, starting at 1.
+   */
+  public final int line;
+
+  /**
+   * The column number, starting at 1.
+   */
+  public final int column;
+
+  Location(int offset, int line, int column) {
+    this.offset = offset;
+    this.column = column;
+    this.line = line;
+  }
+
+  @Override
+  public String toString() {
+    return line + ":" + column;
+  }
+
+  @Override
+  public int hashCode() {
+    return offset;
+  }
+
+  @Override
+  public boolean equals(Object obj) {
+    if (this == obj) {
+      return true;
+    }
+    if (obj == null) {
+      return false;
+    }
+    if (getClass() != obj.getClass()) {
+      return false;
+    }
+    Location other = (Location)obj;
+    return offset == other.offset && column == other.column && line == other.line;
+  }
+
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/json/ParseException.java

@@ -0,0 +1,83 @@
+/*******************************************************************************
+ * Copyright (c) 2013, 2016 EclipseSource.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ ******************************************************************************/
+
+// from https://github.com/ralfstx/minimal-json
+
+package com.formdev.flatlaf.json;
+
+/**
+ * An unchecked exception to indicate that an input does not qualify as valid JSON.
+ */
+public class ParseException extends RuntimeException {
+
+  private final Location location;
+
+  ParseException(String message, Location location) {
+    super(message + " at " + location);
+    this.location = location;
+  }
+
+  /**
+   * Returns the location at which the error occurred.
+   *
+   * @return the error location
+   */
+  public Location getLocation() {
+    return location;
+  }
+
+  /**
+   * Returns the absolute character index at which the error occurred. The offset of the first
+   * character of a document is 0.
+   *
+   * @return the character offset at which the error occurred, will be >= 0
+   * @deprecated Use {@link #getLocation()} instead
+   */
+  @Deprecated
+  public int getOffset() {
+    return location.offset;
+  }
+
+  /**
+   * Returns the line number in which the error occurred. The number of the first line is 1.
+   *
+   * @return the line in which the error occurred, will be >= 1
+   * @deprecated Use {@link #getLocation()} instead
+   */
+  @Deprecated
+  public int getLine() {
+    return location.line;
+  }
+
+  /**
+   * Returns the column number at which the error occurred, i.e. the number of the character in its
+   * line. The number of the first character of a line is 1.
+   *
+   * @return the column in which the error occurred, will be >= 1
+   * @deprecated Use {@link #getLocation()} instead
+   */
+  @Deprecated
+  public int getColumn() {
+    return location.column;
+  }
+
+}

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

@@ -38,12 +38,15 @@ public class FlatArrowButton
 	extends BasicArrowButton
 	implements UIResource
 {
+	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;
 
+	private int arrowWidth = DEFAULT_ARROW_WIDTH;
 	private int xOffset = 0;
 	private int yOffset = 0;
 
@@ -80,6 +83,14 @@ public class FlatArrowButton
 		}
 	}
 
+	public int getArrowWidth() {
+		return arrowWidth;
+	}
+
+	public void setArrowWidth( int arrowWidth ) {
+		this.arrowWidth = arrowWidth;
+	}
+
 	protected boolean isHover() {
 		return hover;
 	}
@@ -128,8 +139,8 @@ public class FlatArrowButton
 		int direction = getDirection();
 		boolean vert = (direction == NORTH || direction == SOUTH);
 
-		int w = scale( chevron ? 8 : 9 );
-		int h = scale( chevron ? 4 : 5 );
+		int w = scale( arrowWidth + (chevron ? 0 : 1) );
+		int h = scale( (arrowWidth / 2) + (chevron ? 0 : 1) );
 		int rw = vert ? w : h;
 		int rh = vert ? h : w;
 		int x = Math.round( (width - rw) / 2f + scale( (float) xOffset ) );
@@ -157,7 +168,7 @@ public class FlatArrowButton
 		g.translate( -x, -y );
 	}
 
-	public static Shape createArrowShape( int direction, boolean chevron, int w, int h ) {
+	public static Shape createArrowShape( int direction, boolean chevron, float w, float h ) {
 		switch( direction ) {
 			case NORTH:	return FlatUIUtils.createPath( !chevron, 0,h, (w / 2f),0, w,h );
 			case SOUTH:	return FlatUIUtils.createPath( !chevron, 0,0, (w / 2f),h, w,0 );

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

@@ -48,7 +48,7 @@ import javax.swing.text.JTextComponent;
  * {@link FlatUIUtils#paintParentBackground} to paint the empty space correctly.
  *
  * @uiDefault Component.focusWidth			int
- * @uiDefault Component.innerFocusWidth		int
+ * @uiDefault Component.innerFocusWidth		int or float
  * @uiDefault Component.focusColor			Color
  * @uiDefault Component.borderColor			Color
  * @uiDefault Component.disabledBorderColor	Color
@@ -60,7 +60,7 @@ public class FlatBorder
 	extends BasicBorders.MarginBorder
 {
 	protected final int focusWidth = UIManager.getInt( "Component.focusWidth" );
-	protected final int innerFocusWidth = UIManager.getInt( "Component.innerFocusWidth" );
+	protected final float innerFocusWidth = FlatUIUtils.getUIFloat( "Component.innerFocusWidth", 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" );
@@ -72,18 +72,19 @@ public class FlatBorder
 		try {
 			FlatUIUtils.setRenderingHints( g2 );
 
-			float focusWidth = getFocusWidth();
+			boolean isCellEditor = isTableCellEditor( c );
+			float focusWidth = isCellEditor ? 0 : getFocusWidth();
 			float borderWidth = getBorderWidth( c );
-			float arc = getArc();
+			float arc = isCellEditor ? 0 : getArc( c );
 
 			if( isFocused( c ) ) {
 				g2.setColor( getFocusColor( c ) );
-				FlatUIUtils.paintOutlineBorder( g2, x, y, width, height, focusWidth,
-					getLineWidth() + scale( (float) innerFocusWidth ), arc );
+				FlatUIUtils.paintComponentOuterBorder( g2, x, y, width, height, focusWidth,
+					getLineWidth() + scale( innerFocusWidth ), arc );
 			}
 
 			g2.setPaint( getBorderColor( c ) );
-			FlatUIUtils.drawRoundRectangle( g2, x, y, width, height, focusWidth, borderWidth, arc );
+			FlatUIUtils.paintComponentBorder( g2, x, y, width, height, focusWidth, borderWidth, arc );
 		} finally {
 			g2.dispose();
 		}
@@ -94,12 +95,23 @@ public class FlatBorder
 	}
 
 	protected Paint getBorderColor( Component c ) {
-		boolean enabled = c.isEnabled() && (!(c instanceof JTextComponent) || ((JTextComponent)c).isEditable());
-		return enabled
+		return isEnabled( c )
 			? (isFocused( c ) ? focusedBorderColor : borderColor)
 			: disabledBorderColor;
 	}
 
+	protected boolean isEnabled( Component c ) {
+		if( c instanceof JScrollPane ) {
+			// check whether view component is disabled
+			JViewport viewport = ((JScrollPane)c).getViewport();
+			Component view = (viewport != null) ? viewport.getView() : null;
+			if( view != null && !isEnabled( view ) )
+				return false;
+		}
+
+		return c.isEnabled() && (!(c instanceof JTextComponent) || ((JTextComponent)c).isEditable());
+	}
+
 	protected boolean isFocused( Component c ) {
 		if( c instanceof JScrollPane ) {
 			JViewport viewport = ((JScrollPane)c).getViewport();
@@ -132,9 +144,14 @@ public class FlatBorder
 			return c.hasFocus();
 	}
 
+	protected boolean isTableCellEditor( Component c ) {
+		return FlatUIUtils.isTableCellEditor( c );
+	}
+
 	@Override
 	public Insets getBorderInsets( Component c, Insets insets ) {
-		float ow = getFocusWidth() + getLineWidth();
+		boolean isCellEditor = isTableCellEditor( c );
+		float ow = (isCellEditor ? 0 : getFocusWidth()) + getLineWidth();
 
 		insets = super.getBorderInsets( c, insets );
 		insets.top = Math.round( scale( (float) insets.top ) + ow );
@@ -156,7 +173,7 @@ public class FlatBorder
 		return getLineWidth();
 	}
 
-	protected float getArc() {
+	protected float getArc( Component c ) {
 		return 0;
 	}
 }

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

@@ -19,6 +19,7 @@ package com.formdev.flatlaf.ui;
 import static com.formdev.flatlaf.util.UIScale.scale;
 import java.awt.Color;
 import java.awt.Component;
+import java.awt.GradientPaint;
 import java.awt.Graphics;
 import java.awt.Insets;
 import java.awt.Paint;
@@ -30,10 +31,14 @@ import javax.swing.plaf.UIResource;
  * Border for {@link javax.swing.JButton}.
  *
  * @uiDefault Button.borderColor				Color
+ * @uiDefault Button.startBorderColor			Color	optional; if set, a gradient paint is used and Button.borderColor is ignored
+ * @uiDefault Button.endBorderColor				Color	optional; if set, a gradient paint is used
  * @uiDefault Button.disabledBorderColor		Color
  * @uiDefault Button.focusedBorderColor			Color
  * @uiDefault Button.hoverBorderColor			Color	optional
  * @uiDefault Button.default.borderColor		Color
+ * @uiDefault Button.default.startBorderColor	Color	optional; if set, a gradient paint is used and Button.default.borderColor is ignored
+ * @uiDefault Button.default.endBorderColor		Color	optional; if set, a gradient paint is used
  * @uiDefault Button.default.hoverBorderColor	Color	optional
  * @uiDefault Button.default.focusedBorderColor	Color
  * @uiDefault Button.default.focusColor			Color
@@ -45,11 +50,13 @@ import javax.swing.plaf.UIResource;
 public class FlatButtonBorder
 	extends FlatBorder
 {
-	protected final Color borderColor = UIManager.getColor( "Button.borderColor" );
+	protected final Color borderColor = FlatUIUtils.getUIColor( "Button.startBorderColor", "Button.borderColor" );
+	protected final Color endBorderColor = UIManager.getColor( "Button.endBorderColor" );
 	protected final Color disabledBorderColor = UIManager.getColor( "Button.disabledBorderColor" );
 	protected final Color focusedBorderColor = UIManager.getColor( "Button.focusedBorderColor" );
 	protected final Color hoverBorderColor = UIManager.getColor( "Button.hoverBorderColor" );
-	protected final Color defaultBorderColor = UIManager.getColor( "Button.default.borderColor" );
+	protected final Color defaultBorderColor = FlatUIUtils.getUIColor( "Button.default.startBorderColor", "Button.default.borderColor" );
+	protected final Color defaultEndBorderColor = UIManager.getColor( "Button.default.endBorderColor" );
 	protected final Color defaultHoverBorderColor = UIManager.getColor( "Button.default.hoverBorderColor" );
 	protected final Color defaultFocusedBorderColor = UIManager.getColor( "Button.default.focusedBorderColor" );
 	protected final Color defaultFocusColor = UIManager.getColor( "Button.default.focusColor" );
@@ -58,7 +65,7 @@ public class FlatButtonBorder
 
 	@Override
 	public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
-		if( FlatButtonUI.isContentAreaFilled( c ) && !FlatButtonUI.isHelpButton( c ) )
+		if( FlatButtonUI.isContentAreaFilled( c ) && !FlatButtonUI.isHelpButton( c ) && !FlatToggleButtonUI.isUnderlineButton( c ) )
 			super.paintBorder( c, g, x, y, width, height );
 	}
 
@@ -70,12 +77,20 @@ public class FlatButtonBorder
 	@Override
 	protected Paint getBorderColor( Component c ) {
 		boolean def = FlatButtonUI.isDefaultButton( c );
-		return FlatButtonUI.buttonStateColor( c,
+		Paint color = FlatButtonUI.buttonStateColor( c,
 			def ? defaultBorderColor : borderColor,
 			disabledBorderColor,
 			def ? defaultFocusedBorderColor : focusedBorderColor,
 			def ? defaultHoverBorderColor : hoverBorderColor,
 			null );
+
+		// change to gradient paint if start/end colors are specified
+		Color startBg = def ? defaultBorderColor : borderColor;
+		Color endBg = def ? defaultEndBorderColor : endBorderColor;
+		if( color == startBg && endBg != null && !startBg.equals( endBg ) )
+			color = new GradientPaint( 0, 0, startBg, 0, c.getHeight(), endBg );
+
+		return color;
 	}
 
 	@Override
@@ -95,7 +110,7 @@ public class FlatButtonBorder
 	}
 
 	@Override
-	protected float getArc() {
-		return scale( (float) arc );
+	protected float getArc( Component c ) {
+		return FlatButtonUI.isSquareButton( c ) ? 0 : scale( (float) arc );
 	}
 }

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

@@ -23,9 +23,11 @@ import java.awt.Component;
 import java.awt.Dimension;
 import java.awt.Font;
 import java.awt.FontMetrics;
+import java.awt.GradientPaint;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
 import java.awt.Rectangle;
+import java.awt.geom.RoundRectangle2D;
 import javax.swing.AbstractButton;
 import javax.swing.ButtonModel;
 import javax.swing.Icon;
@@ -39,26 +41,44 @@ import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicButtonUI;
 import com.formdev.flatlaf.FlatLaf;
+import com.formdev.flatlaf.util.UIScale;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JButton}.
  *
- * TODO document used UI defaults of superclass
+ * <!-- BasicButtonUI -->
+ *
+ * @uiDefault Button.font						Font
+ * @uiDefault Button.background					Color
+ * @uiDefault Button.foreground					Color
+ * @uiDefault Button.border						Border
+ * @uiDefault Button.margin						Insets
+ * @uiDefault Button.rollover					boolean
+ *
+ * <!-- 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
+ * @uiDefault Button.endBackground				Color	optional; if set, a gradient paint is used
  * @uiDefault Button.focusedBackground			Color	optional
  * @uiDefault Button.hoverBackground			Color	optional
  * @uiDefault Button.pressedBackground			Color	optional
  * @uiDefault Button.disabledText				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
  * @uiDefault Button.default.foreground			Color
  * @uiDefault Button.default.focusedBackground	Color	optional
  * @uiDefault Button.default.hoverBackground	Color	optional
  * @uiDefault Button.default.pressedBackground	Color	optional
  * @uiDefault Button.default.boldText			boolean
+ * @uiDefault Button.paintShadow				boolean	default is false
+ * @uiDefault Button.shadowWidth				int		default is 2
+ * @uiDefault Button.shadowColor				Color	optional
+ * @uiDefault Button.default.shadowColor		Color	optional
  * @uiDefault Button.toolbar.hoverBackground	Color
  * @uiDefault Button.toolbar.pressedBackground	Color
  *
@@ -72,18 +92,25 @@ public class FlatButtonUI
 	protected int minimumWidth;
 	protected int iconTextGap;
 
+	protected Color startBackground;
+	protected Color endBackground;
 	protected Color focusedBackground;
 	protected Color hoverBackground;
 	protected Color pressedBackground;
 	protected Color disabledText;
 
 	protected Color defaultBackground;
+	protected Color defaultEndBackground;
 	protected Color defaultForeground;
 	protected Color defaultFocusedBackground;
 	protected Color defaultHoverBackground;
 	protected Color defaultPressedBackground;
 	protected boolean defaultBoldText;
 
+	protected int shadowWidth;
+	protected Color shadowColor;
+	protected Color defaultShadowColor;
+
 	protected Color toolbarHoverBackground;
 	protected Color toolbarPressedBackground;
 
@@ -107,16 +134,29 @@ public class FlatButtonUI
 			String prefix = getPropertyPrefix();
 
 			focusWidth = UIManager.getInt( "Component.focusWidth" );
-			arc = UIManager.getInt( prefix + "arc" );
+			arc = UIManager.getInt( "Button.arc" );
 			minimumWidth = UIManager.getInt( prefix + "minimumWidth" );
 			iconTextGap = FlatUIUtils.getUIInt( prefix + "iconTextGap", 4 );
 
+			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" );
 			disabledText = UIManager.getColor( prefix + "disabledText" );
 
-			defaultBackground = UIManager.getColor( "Button.default.background" );
+			if( UIManager.getBoolean( "Button.paintShadow" ) ) {
+				shadowWidth = FlatUIUtils.getUIInt( "Button.shadowWidth", 2 );
+				shadowColor = UIManager.getColor( "Button.shadowColor" );
+				defaultShadowColor = UIManager.getColor( "Button.default.shadowColor" );
+			} else {
+				shadowWidth = 0;
+				shadowColor = null;
+				defaultShadowColor = null;
+			}
+
+			defaultBackground = FlatUIUtils.getUIColor( "Button.default.startBackground", "Button.default.background" );
+			defaultEndBackground = UIManager.getColor( "Button.default.endBackground" );
 			defaultForeground = UIManager.getColor( "Button.default.foreground" );
 			defaultFocusedBackground = UIManager.getColor( "Button.default.focusedBackground" );
 			defaultHoverBackground = UIManager.getColor( "Button.default.hoverBackground" );
@@ -131,6 +171,13 @@ public class FlatButtonUI
 			defaults_initialized = true;
 		}
 
+		if( startBackground != null ) {
+			Color bg = b.getBackground();
+			if( bg == null || bg instanceof UIResource )
+				b.setBackground( startBackground );
+		}
+
+		LookAndFeel.installProperty( b, "opaque", false );
 		LookAndFeel.installProperty( b, "iconTextGap", scale( iconTextGap ) );
 
 		MigLayoutVisualPadding.install( b, focusWidth );
@@ -153,10 +200,17 @@ public class FlatButtonUI
 	}
 
 	static boolean isIconOnlyButton( Component c ) {
-		String text;
-		return c instanceof JButton &&
-			((JButton)c).getIcon() != null &&
-			((text = ((JButton)c).getText()) == null || text.isEmpty());
+		if( !(c instanceof JButton) )
+			return false;
+
+		Icon icon = ((JButton)c).getIcon();
+		String text = ((JButton)c).getText();
+		return (icon != null && (text == null || text.isEmpty())) ||
+			(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 boolean isHelpButton( Component c ) {
@@ -169,36 +223,56 @@ public class FlatButtonUI
 
 	@Override
 	public void update( Graphics g, JComponent c ) {
-		if( isHelpButton( c ) ) {
+		// fill background if opaque to avoid garbage if user sets opaque to true
+		if( c.isOpaque() )
 			FlatUIUtils.paintParentBackground( g, c );
+
+		if( isHelpButton( c ) ) {
 			helpButtonIcon.paintIcon( c, g, 0, 0 );
 			return;
 		}
 
-		if( c.isOpaque() && isContentAreaFilled( c ) ) {
-			FlatUIUtils.paintParentBackground( g, c );
-
-			Color background = getBackground( c );
-			if( background != null ) {
-				Graphics2D g2 = (Graphics2D) g.create();
-				try {
-					FlatUIUtils.setRenderingHints( g2 );
-
-					Border border = c.getBorder();
-					float focusWidth = (border instanceof FlatBorder) ? scale( (float) this.focusWidth ) : 0;
-					float arc = (border instanceof FlatButtonBorder || isToolBarButton( c )) ? scale( (float) this.arc ) : 0;
-
-					g2.setColor( background );
-					FlatUIUtils.fillRoundRectangle( g2, 0, 0, c.getWidth(), c.getHeight(), focusWidth, arc );
-				} finally {
-					g2.dispose();
-				}
-			}
-		}
+		if( isContentAreaFilled( c ) )
+			paintBackground( g, c );
 
 		paint( g, c );
 	}
 
+	protected void paintBackground( Graphics g, JComponent c ) {
+		Color background = getBackground( c );
+		if( background != null ) {
+			Graphics2D g2 = (Graphics2D) g.create();
+			try {
+				FlatUIUtils.setRenderingHints( g2 );
+
+				Border border = c.getBorder();
+				float focusWidth = (border instanceof FlatBorder) ? scale( (float) this.focusWidth ) : 0;
+				float arc = ((border instanceof FlatButtonBorder && !isSquareButton( c )) || isToolBarButton( c ))
+					? scale( (float) this.arc ) : 0;
+				boolean def = isDefaultButton( c );
+
+				// paint shadow
+				Color shadowColor = def ? defaultShadowColor : this.shadowColor;
+				if( shadowColor != null && shadowWidth > 0 && focusWidth > 0 && !c.hasFocus() && c.isEnabled() ) {
+					g2.setColor( shadowColor );
+					g2.fill( new RoundRectangle2D.Float( focusWidth, focusWidth + UIScale.scale( (float) shadowWidth ),
+						c.getWidth() - focusWidth * 2, c.getHeight() - 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, c.getHeight(), endBg ) );
+				else
+					FlatUIUtils.setColor( g2, background, def ? defaultBackground : c.getBackground() );
+				FlatUIUtils.paintComponentBackground( g2, 0, 0, c.getWidth(), c.getHeight(), focusWidth, arc );
+			} finally {
+				g2.dispose();
+			}
+		}
+	}
+
 	@Override
 	protected void paintText( Graphics g, AbstractButton b, Rectangle textRect, String text ) {
 		if( isHelpButton( b ) )
@@ -218,7 +292,7 @@ public class FlatButtonUI
 		paintText( g, b, textRect, text, b.isEnabled() ? getForeground( b ) : disabledText );
 	}
 
-	static void paintText( Graphics g, AbstractButton b, Rectangle textRect, String text, Color foreground ) {
+	public static void paintText( Graphics g, AbstractButton b, Rectangle textRect, String text, Color foreground ) {
 		FontMetrics fm = b.getFontMetrics( b.getFont() );
 		int mnemonicIndex = FlatLaf.isShowMnemonics() ? b.getDisplayedMnemonicIndex() : -1;
 
@@ -284,9 +358,12 @@ public class FlatButtonUI
 
 		Dimension prefSize = super.getPreferredSize( c );
 
-		// apply minimum width, if not in toolbar and not a icon-only button
-		if( !isToolBarButton( c ) && !isIconOnlyButton( c ) )
-			prefSize.width = Math.max( prefSize.width, scale( minimumWidth + (focusWidth * 2) ) );
+		// 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 ) )
+			prefSize.width = Math.max( prefSize.width, prefSize.height );
+		else if( !isToolBarButton( c ) )
+			prefSize.width = Math.max( prefSize.width, scale( FlatUIUtils.minimumWidth( c, minimumWidth ) + (focusWidth * 2) ) );
 
 		return prefSize;
 	}

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

@@ -25,6 +25,26 @@ import javax.swing.plaf.basic.BasicCheckBoxMenuItemUI;
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JCheckBoxMenuItem}.
  *
+ * <!-- 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
+ *
  * @author Karl Tauber
  */
 public class FlatCheckBoxMenuItemUI

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

@@ -22,6 +22,21 @@ import javax.swing.plaf.ComponentUI;
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JCheckBox}.
  *
+ * <!-- BasicRadioButtonUI -->
+ *
+ * @uiDefault CheckBox.font						Font
+ * @uiDefault CheckBox.background				Color
+ * @uiDefault CheckBox.foreground				Color
+ * @uiDefault CheckBox.border					Border
+ * @uiDefault CheckBox.margin					Insets
+ * @uiDefault CheckBox.rollover					boolean
+ * @uiDefault CheckBox.icon						Icon
+ *
+ * <!-- FlatRadioButtonUI -->
+ *
+ * @uiDefault CheckBox.iconTextGap				int
+ * @uiDefault CheckBox.disabledText				Color
+ *
  * @author Karl Tauber
  */
 public class FlatCheckBoxUI

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

@@ -26,6 +26,11 @@ import com.formdev.flatlaf.util.UIScale;
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JColorChooser}.
  *
+ * <!-- BasicColorChooserUI -->
+ *
+ * @uiDefault ColorChooser.font							Font
+ * @uiDefault ColorChooser.background					Color
+ * @uiDefault ColorChooser.foreground					Color
  * @uiDefault ColorChooser.showPreviewPanelText			boolean
  * @uiDefault ColorChooser.swatchesSwatchSize			Dimension
  * @uiDefault ColorChooser.swatchesRecentSwatchSize		Dimension

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

@@ -19,6 +19,7 @@ package com.formdev.flatlaf.ui;
 import static com.formdev.flatlaf.util.UIScale.scale;
 import java.awt.Color;
 import java.awt.Component;
+import java.awt.ComponentOrientation;
 import java.awt.Container;
 import java.awt.Dimension;
 import java.awt.Graphics;
@@ -33,13 +34,16 @@ import java.awt.event.MouseListener;
 import java.awt.geom.Rectangle2D;
 import java.beans.PropertyChangeEvent;
 import java.beans.PropertyChangeListener;
+import java.lang.ref.WeakReference;
 import javax.swing.BorderFactory;
+import javax.swing.DefaultListCellRenderer;
 import javax.swing.JButton;
 import javax.swing.JComboBox;
 import javax.swing.JComponent;
 import javax.swing.JList;
 import javax.swing.JPanel;
 import javax.swing.ListCellRenderer;
+import javax.swing.LookAndFeel;
 import javax.swing.SwingConstants;
 import javax.swing.UIManager;
 import javax.swing.border.AbstractBorder;
@@ -49,18 +53,30 @@ import javax.swing.plaf.basic.BasicComboBoxUI;
 import javax.swing.plaf.basic.BasicComboPopup;
 import javax.swing.plaf.basic.ComboPopup;
 import javax.swing.text.JTextComponent;
+import com.formdev.flatlaf.FlatClientProperties;
 import com.formdev.flatlaf.util.UIScale;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JComboBox}.
  *
- * TODO document used UI defaults of superclass
+ * <!-- BasicComboBoxUI -->
+ *
+ * @uiDefault ComboBox.font						Font
+ * @uiDefault ComboBox.background				Color
+ * @uiDefault ComboBox.foreground				Color
+ * @uiDefault ComboBox.border					Border
+ * @uiDefault ComboBox.padding					Insets
+ * @uiDefault ComboBox.squareButton				boolean	default is true
+ *
+ * <!-- FlatComboBoxUI -->
  *
  * @uiDefault Component.focusWidth				int
  * @uiDefault Component.arc						int
  * @uiDefault Component.arrowType				String	triangle (default) or chevron
+ * @uiDefault Component.isIntelliJTheme			boolean
  * @uiDefault Component.borderColor				Color
  * @uiDefault Component.disabledBorderColor		Color
+ * @uiDefault ComboBox.editableBackground		Color	optional; defaults to ComboBox.background
  * @uiDefault ComboBox.disabledBackground		Color
  * @uiDefault ComboBox.disabledForeground		Color
  * @uiDefault ComboBox.buttonBackground			Color
@@ -77,9 +93,11 @@ public class FlatComboBoxUI
 	protected int focusWidth;
 	protected int arc;
 	protected String arrowType;
+	protected boolean isIntelliJTheme;
 	protected Color borderColor;
 	protected Color disabledBorderColor;
 
+	protected Color editableBackground;
 	protected Color disabledBackground;
 	protected Color disabledForeground;
 
@@ -92,6 +110,8 @@ public class FlatComboBoxUI
 	private MouseListener hoverListener;
 	private boolean hover;
 
+	private WeakReference<Component> lastRendererComponent;
+
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatComboBoxUI();
 	}
@@ -122,12 +142,16 @@ public class FlatComboBoxUI
 	protected void installDefaults() {
 		super.installDefaults();
 
+		LookAndFeel.installProperty( comboBox, "opaque", false );
+
 		focusWidth = UIManager.getInt( "Component.focusWidth" );
 		arc = UIManager.getInt( "Component.arc" );
 		arrowType = UIManager.getString( "Component.arrowType" );
+		isIntelliJTheme = UIManager.getBoolean( "Component.isIntelliJTheme" );
 		borderColor = UIManager.getColor( "Component.borderColor" );
 		disabledBorderColor = UIManager.getColor( "Component.disabledBorderColor" );
 
+		editableBackground = UIManager.getColor( "ComboBox.editableBackground" );
 		disabledBackground = UIManager.getColor( "ComboBox.disabledBackground" );
 		disabledForeground = UIManager.getColor( "ComboBox.disabledForeground" );
 
@@ -150,6 +174,7 @@ public class FlatComboBoxUI
 		borderColor = null;
 		disabledBorderColor = null;
 
+		editableBackground = null;
 		disabledBackground = null;
 		disabledForeground = null;
 
@@ -208,12 +233,16 @@ public class FlatComboBoxUI
 				String propertyName = e.getPropertyName();
 
 				if( editor != null &&
-					((source == comboBox && (propertyName == "background" || propertyName == "foreground")) ||
+					((source == comboBox && propertyName == "foreground") ||
 					 (source == editor && propertyName == "enabled")) )
 				{
 					// fix editor component colors
 					updateEditorColors();
-				}
+				} else if( editor != null && source == comboBox && propertyName == "componentOrientation" ) {
+					ComponentOrientation o = (ComponentOrientation) e.getNewValue();
+					editor.applyComponentOrientation( o );
+				} else if( editor != null && FlatClientProperties.PLACEHOLDER_TEXT.equals( propertyName ) )
+					editor.repaint();
 			}
 		};
 	}
@@ -235,6 +264,12 @@ public class FlatComboBoxUI
 		if( editor instanceof JTextComponent )
 			((JTextComponent)editor).setBorder( BorderFactory.createEmptyBorder() );
 
+		// explicitly make non-opaque
+		if( editor instanceof JComponent )
+			((JComponent)editor).setOpaque( false );
+
+		editor.applyComponentOrientation( comboBox.getComponentOrientation() );
+
 		updateEditorColors();
 	}
 
@@ -243,7 +278,6 @@ public class FlatComboBoxUI
 		// is used, then the editor is updated after the combobox and the
 		// colors are again replaced with default colors
 		boolean enabled = editor.isEnabled();
-		editor.setBackground( FlatUIUtils.nonUIResource( enabled ? comboBox.getBackground() : disabledBackground ) );
 		editor.setForeground( FlatUIUtils.nonUIResource( (enabled || editor instanceof JTextComponent)
 			? comboBox.getForeground()
 			: disabledForeground ) );
@@ -265,44 +299,46 @@ public class FlatComboBoxUI
 
 	@Override
 	public void update( Graphics g, JComponent c ) {
-		if( c.isOpaque() ) {
+		// fill background if opaque to avoid garbage if user sets opaque to true
+		if( c.isOpaque() && (focusWidth > 0 || arc != 0) )
 			FlatUIUtils.paintParentBackground( g, c );
 
-			Graphics2D g2 = (Graphics2D) g;
-			FlatUIUtils.setRenderingHints( g2 );
+		Graphics2D g2 = (Graphics2D) g;
+		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 enabled = comboBox.isEnabled();
-			boolean isLeftToRight = comboBox.getComponentOrientation().isLeftToRight();
+		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 enabled = comboBox.isEnabled();
+		boolean isLeftToRight = comboBox.getComponentOrientation().isLeftToRight();
 
-			// paint background
-			g2.setColor( enabled ? c.getBackground() : disabledBackground );
-			FlatUIUtils.fillRoundRectangle( g2, 0, 0, width, height, focusWidth, arc );
+		// paint background
+		g2.setColor( enabled
+			? (editableBackground != null && comboBox.isEditable() ? editableBackground : c.getBackground())
+			: getDisabledBackground( comboBox ) );
+		FlatUIUtils.paintComponentBackground( g2, 0, 0, width, height, focusWidth, arc );
 
-			// paint arrow button background
-			if( enabled ) {
-				g2.setColor( comboBox.isEditable() ? buttonEditableBackground : buttonBackground );
-				Shape oldClip = g2.getClip();
-				if( isLeftToRight )
-					g2.clipRect( arrowX, 0, width - arrowX, height );
-				else
-					g2.clipRect( 0, 0, arrowX + arrowWidth, height );
-				FlatUIUtils.fillRoundRectangle( g2, 0, 0, width, height, focusWidth, arc );
-				g2.setClip( oldClip );
-			}
+		// paint arrow button background
+		if( enabled ) {
+			g2.setColor( comboBox.isEditable() ? buttonEditableBackground : 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 );
+		}
 
-			if( comboBox.isEditable() ) {
-				// paint vertical line between value and arrow button
-				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 - (focusWidth * 2) ) );
-			}
+		// paint vertical line between value and arrow button
+		if( comboBox.isEditable() ) {
+			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 );
@@ -312,14 +348,17 @@ public class FlatComboBoxUI
 	@SuppressWarnings( "unchecked" )
 	public void paintCurrentValue( Graphics g, Rectangle bounds, boolean hasFocus ) {
 		ListCellRenderer<Object> renderer = comboBox.getRenderer();
-		CellPaddingBorder.uninstall( renderer );
+		uninstallCellPaddingBorder( renderer );
+		if( renderer == null )
+			renderer = new DefaultListCellRenderer();
 		Component c = renderer.getListCellRendererComponent( listBox, comboBox.getSelectedItem(), -1, false, false );
 		c.setFont( comboBox.getFont() );
-		CellPaddingBorder.uninstall( c );
+		c.applyComponentOrientation( comboBox.getComponentOrientation() );
+		uninstallCellPaddingBorder( c );
 
 		boolean enabled = comboBox.isEnabled();
 		c.setForeground( enabled ? comboBox.getForeground() : disabledForeground );
-		c.setBackground( enabled ? comboBox.getBackground() : disabledBackground );
+		c.setBackground( enabled ? comboBox.getBackground() : getDisabledBackground( comboBox ) );
 
 		boolean shouldValidate = (c instanceof JPanel);
 		if( padding != null )
@@ -336,10 +375,38 @@ public class FlatComboBoxUI
 
 	@Override
 	public void paintCurrentValueBackground( Graphics g, Rectangle bounds, boolean hasFocus ) {
-		g.setColor( comboBox.isEnabled() ? comboBox.getBackground() : disabledBackground );
+		g.setColor( comboBox.isEnabled() ? comboBox.getBackground() : getDisabledBackground( comboBox ) );
 		g.fillRect( bounds.x, bounds.y, bounds.width, bounds.height );
 	}
 
+	private Color getDisabledBackground( JComponent c ) {
+		return isIntelliJTheme ? FlatUIUtils.getParentBackground( c ) : disabledBackground;
+	}
+
+	@Override
+	protected Dimension getDefaultSize() {
+		@SuppressWarnings( "unchecked" )
+		ListCellRenderer<Object> renderer = comboBox.getRenderer();
+		uninstallCellPaddingBorder( renderer );
+
+		Dimension size = super.getDefaultSize();
+
+		uninstallCellPaddingBorder( renderer );
+		return size;
+	}
+
+	@Override
+	protected Dimension getDisplaySize() {
+		@SuppressWarnings( "unchecked" )
+		ListCellRenderer<Object> renderer = comboBox.getRenderer();
+		uninstallCellPaddingBorder( renderer );
+
+		Dimension displaySize = super.getDisplaySize();
+
+		uninstallCellPaddingBorder( renderer );
+		return displaySize;
+	}
+
 	@Override
 	protected Dimension getSizeForComponent( Component comp ) {
 		Dimension size = super.getSizeForComponent( comp );
@@ -363,17 +430,33 @@ public class FlatComboBoxUI
 		return null;
 	}
 
+	private void uninstallCellPaddingBorder( Object o ) {
+		CellPaddingBorder.uninstall( o );
+		if( lastRendererComponent != null ) {
+			CellPaddingBorder.uninstall( lastRendererComponent );
+			lastRendererComponent = null;
+		}
+	}
+
 	//---- class FlatComboPopup -----------------------------------------------
 
 	@SuppressWarnings( { "rawtypes", "unchecked" } )
 	private class FlatComboPopup
 		extends BasicComboPopup
-		implements ListCellRenderer
 	{
 		private CellPaddingBorder paddingBorder;
 
 		FlatComboPopup( JComboBox combo ) {
 			super( combo );
+
+			// BasicComboPopup listens to JComboBox.componentOrientation and updates
+			// the component orientation of the list, scroller and popup, but when
+			// switching the LaF and a new combo popup is created, the component
+			// orientation is not applied.
+			ComponentOrientation o = comboBox.getComponentOrientation();
+			list.setComponentOrientation( o );
+			scroller.setComponentOrientation( o );
+			setComponentOrientation( o );
 		}
 
 		@Override
@@ -387,7 +470,13 @@ public class FlatComboBoxUI
 				comboBox.setPrototypeDisplayValue( prototype );
 
 			// make popup wider if necessary
-			pw = Math.max( pw, displaySize.width );
+			if( displaySize.width > pw ) {
+				int diff = displaySize.width - pw;
+				pw = displaySize.width;
+
+				if( !comboBox.getComponentOrientation().isLeftToRight() )
+					px -= diff;
+			}
 
 			return super.computePopupBounds( px, py, pw, ph );
 		}
@@ -405,7 +494,7 @@ public class FlatComboBoxUI
 		protected void configureList() {
 			super.configureList();
 
-			list.setCellRenderer( this );
+			list.setCellRenderer( new PopupListCellRenderer() );
 		}
 
 		@Override
@@ -416,27 +505,39 @@ public class FlatComboBoxUI
 					super.propertyChange( e );
 
 					if( e.getPropertyName() == "renderer" )
-						list.setCellRenderer( FlatComboPopup.this );
+						list.setCellRenderer( new PopupListCellRenderer() );
 				}
 			};
 		}
 
-		@Override
-		public Component getListCellRendererComponent( JList list, Object value,
-			int index, boolean isSelected, boolean cellHasFocus )
+		//---- class PopupListCellRenderer -----
+
+		private class PopupListCellRenderer
+			implements ListCellRenderer
 		{
-			ListCellRenderer renderer = comboBox.getRenderer();
-			CellPaddingBorder.uninstall( renderer );
+			@Override
+			public Component getListCellRendererComponent( JList list, Object value,
+				int index, boolean isSelected, boolean cellHasFocus )
+			{
+				ListCellRenderer renderer = comboBox.getRenderer();
+				CellPaddingBorder.uninstall( renderer );
+				CellPaddingBorder.uninstall( lastRendererComponent );
 
-			Component c = renderer.getListCellRendererComponent( list, value, index, isSelected, cellHasFocus );
+				if( renderer == null )
+					renderer = new DefaultListCellRenderer();
+				Component c = renderer.getListCellRendererComponent( list, value, index, isSelected, cellHasFocus );
+				c.applyComponentOrientation( comboBox.getComponentOrientation() );
 
-			if( c instanceof JComponent ) {
-				if( paddingBorder == null )
-					paddingBorder = new CellPaddingBorder( padding );
-				paddingBorder.install( (JComponent) c );
+				if( c instanceof JComponent ) {
+					if( paddingBorder == null )
+						paddingBorder = new CellPaddingBorder( padding );
+					paddingBorder.install( (JComponent) c );
+				}
+
+				lastRendererComponent = (c != renderer) ? new WeakReference<>( c ) : null;
+
+				return c;
 			}
-
-			return c;
 		}
 	}
 
@@ -469,6 +570,9 @@ public class FlatComboBoxUI
 		}
 
 		static void uninstall( Object o ) {
+			if( o instanceof WeakReference )
+				o = ((WeakReference<?>)o).get();
+
 			if( !(o instanceof JComponent) )
 				return;
 

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

@@ -18,17 +18,37 @@ package com.formdev.flatlaf.ui;
 
 import static com.formdev.flatlaf.util.UIScale.scale;
 import java.awt.Dimension;
+import java.awt.Graphics;
 import javax.swing.JComponent;
+import javax.swing.JEditorPane;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
+import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicEditorPaneUI;
+import javax.swing.text.JTextComponent;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JEditorPane}.
  *
- * TODO document used UI defaults of superclass
+ * <!-- BasicEditorPaneUI -->
+ *
+ * @uiDefault EditorPane.font					Font
+ * @uiDefault EditorPane.background				Color	also used if not editable
+ * @uiDefault EditorPane.foreground				Color
+ * @uiDefault EditorPane.caretForeground		Color
+ * @uiDefault EditorPane.selectionBackground	Color
+ * @uiDefault EditorPane.selectionForeground	Color
+ * @uiDefault EditorPane.disabledBackground		Color	used if not enabled
+ * @uiDefault EditorPane.inactiveBackground		Color	used if not editable
+ * @uiDefault EditorPane.inactiveForeground		Color	used if not enabled (yes, this is confusing; this should be named disabledForeground)
+ * @uiDefault EditorPane.border					Border
+ * @uiDefault EditorPane.margin					Insets
+ * @uiDefault EditorPane.caretBlinkRate			int		default is 500 milliseconds
+ *
+ * <!-- FlatEditorPaneUI -->
  *
  * @uiDefault Component.minimumWidth			int
+ * @uiDefault Component.isIntelliJTheme			boolean
  *
  * @author Karl Tauber
  */
@@ -36,6 +56,9 @@ public class FlatEditorPaneUI
 	extends BasicEditorPaneUI
 {
 	protected int minimumWidth;
+	protected boolean isIntelliJTheme;
+
+	private Object oldHonorDisplayProperties;
 
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatEditorPaneUI();
@@ -46,6 +69,18 @@ public class FlatEditorPaneUI
 		super.installDefaults();
 
 		minimumWidth = UIManager.getInt( "Component.minimumWidth" );
+		isIntelliJTheme = UIManager.getBoolean( "Component.isIntelliJTheme" );
+
+		// use component font and foreground for HTML text
+		oldHonorDisplayProperties = getComponent().getClientProperty( JEditorPane.HONOR_DISPLAY_PROPERTIES );
+		getComponent().putClientProperty( JEditorPane.HONOR_DISPLAY_PROPERTIES, true );
+	}
+
+	@Override
+	protected void uninstallDefaults() {
+		super.uninstallDefaults();
+
+		getComponent().putClientProperty( JEditorPane.HONOR_DISPLAY_PROPERTIES, oldHonorDisplayProperties );
 	}
 
 	@Override
@@ -63,7 +98,21 @@ public class FlatEditorPaneUI
 		// 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 paintBackground( Graphics g ) {
+		JTextComponent c = getComponent();
+
+		// for compatibility with IntelliJ themes
+		if( isIntelliJTheme && (!c.isEnabled() || !c.isEditable()) && (c.getBackground() instanceof UIResource) ) {
+			FlatUIUtils.paintParentBackground( g, c );
+			return;
+		}
+
+		super.paintBackground( g );
+	}
 }

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

@@ -0,0 +1,122 @@
+/*
+ * Copyright 2019 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
+ *
+ *     http://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 javax.swing.JComponent;
+import javax.swing.JFileChooser;
+import javax.swing.plaf.ComponentUI;
+import javax.swing.plaf.metal.MetalFileChooserUI;
+import com.formdev.flatlaf.util.UIScale;
+
+/**
+ * Provides the Flat LaF UI delegate for {@link javax.swing.JFileChooser}.
+ *
+ * <!-- BasicFileChooserUI -->
+ *
+ * @uiDefault FileView.directoryIcon					Icon
+ * @uiDefault FileView.fileIcon							Icon
+ * @uiDefault FileView.computerIcon						Icon
+ * @uiDefault FileView.hardDriveIcon					Icon
+ * @uiDefault FileView.floppyDriveIcon					Icon
+ *
+ * @uiDefault FileChooser.newFolderIcon					Icon
+ * @uiDefault FileChooser.upFolderIcon					Icon
+ * @uiDefault FileChooser.homeFolderIcon				Icon
+ * @uiDefault FileChooser.detailsViewIcon				Icon
+ * @uiDefault FileChooser.listViewIcon					Icon
+ * @uiDefault FileChooser.viewMenuIcon					Icon
+ *
+ * @uiDefault FileChooser.usesSingleFilePane			boolean
+ * @uiDefault FileChooser.readOnly						boolean	if true, "New Folder" is disabled
+ *
+ * @uiDefault FileChooser.newFolderErrorText					String
+ * @uiDefault FileChooser.newFolderErrorSeparator				String
+ * @uiDefault FileChooser.newFolderParentDoesntExistTitleText	String
+ * @uiDefault FileChooser.newFolderParentDoesntExistText		String
+ * @uiDefault FileChooser.fileDescriptionText					String
+ * @uiDefault FileChooser.directoryDescriptionText				String
+ * @uiDefault FileChooser.saveButtonText						String
+ * @uiDefault FileChooser.openButtonText						String
+ * @uiDefault FileChooser.saveDialogTitleText					String
+ * @uiDefault FileChooser.openDialogTitleText					String
+ * @uiDefault FileChooser.cancelButtonText						String
+ * @uiDefault FileChooser.updateButtonText						String
+ * @uiDefault FileChooser.helpButtonText						String
+ * @uiDefault FileChooser.directoryOpenButtonText				String
+ *
+ * @uiDefault FileChooser.saveButtonMnemonic					String
+ * @uiDefault FileChooser.openButtonMnemonic					String
+ * @uiDefault FileChooser.cancelButtonMnemonic					String
+ * @uiDefault FileChooser.updateButtonMnemonic					String
+ * @uiDefault FileChooser.helpButtonMnemonic					String
+ * @uiDefault FileChooser.directoryOpenButtonMnemonic			String
+ *
+ * @uiDefault FileChooser.saveButtonToolTipText					String
+ * @uiDefault FileChooser.openButtonToolTipText					String
+ * @uiDefault FileChooser.cancelButtonToolTipText				String
+ * @uiDefault FileChooser.updateButtonToolTipText				String
+ * @uiDefault FileChooser.helpButtonToolTipText					String
+ * @uiDefault FileChooser.directoryOpenButtonToolTipText		String
+ *
+ * @uiDefault FileChooser.acceptAllFileFilterText				String
+ *
+ * <!-- MetalFileChooserUI -->
+ *
+ * @uiDefault FileChooser.lookInLabelMnemonic					String
+ * @uiDefault FileChooser.lookInLabelText						String
+ * @uiDefault FileChooser.saveInLabelText						String
+ * @uiDefault FileChooser.fileNameLabelMnemonic					String
+ * @uiDefault FileChooser.fileNameLabelText						String
+ * @uiDefault FileChooser.folderNameLabelMnemonic				String
+ * @uiDefault FileChooser.folderNameLabelText					String
+ * @uiDefault FileChooser.filesOfTypeLabelMnemonic				String
+ * @uiDefault FileChooser.filesOfTypeLabelText					String
+ * @uiDefault FileChooser.upFolderToolTipText					String
+ * @uiDefault FileChooser.upFolderAccessibleName				String
+ * @uiDefault FileChooser.homeFolderToolTipText					String
+ * @uiDefault FileChooser.homeFolderAccessibleName				String
+ * @uiDefault FileChooser.newFolderToolTipText					String
+ * @uiDefault FileChooser.newFolderAccessibleName				String
+ * @uiDefault FileChooser.listViewButtonToolTipText				String
+ * @uiDefault FileChooser.listViewButtonAccessibleName			String
+ * @uiDefault FileChooser.detailsViewButtonToolTipText			String
+ * @uiDefault FileChooser.detailsViewButtonAccessibleName		String
+ *
+ * @author Karl Tauber
+ */
+public class FlatFileChooserUI
+	extends MetalFileChooserUI
+{
+	public static ComponentUI createUI( JComponent c ) {
+		return new FlatFileChooserUI( (JFileChooser) c );
+	}
+
+	public FlatFileChooserUI( JFileChooser filechooser ) {
+		super( filechooser );
+	}
+
+	@Override
+	public Dimension getPreferredSize( JComponent c ) {
+		return UIScale.scale( super.getPreferredSize( c ) );
+	}
+
+	@Override
+	public Dimension getMinimumSize( JComponent c ) {
+		return UIScale.scale( super.getMinimumSize( c ) );
+	}
+}

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

@@ -22,6 +22,28 @@ import javax.swing.plaf.ComponentUI;
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JFormattedTextField}.
  *
+ * <!-- BasicTextFieldUI -->
+ *
+ * @uiDefault FormattedTextField.font					Font
+ * @uiDefault FormattedTextField.background				Color
+ * @uiDefault FormattedTextField.foreground				Color	also used if not editable
+ * @uiDefault FormattedTextField.caretForeground		Color
+ * @uiDefault FormattedTextField.selectionBackground	Color
+ * @uiDefault FormattedTextField.selectionForeground	Color
+ * @uiDefault FormattedTextField.disabledBackground		Color	used if not enabled
+ * @uiDefault FormattedTextField.inactiveBackground		Color	used if not editable
+ * @uiDefault FormattedTextField.inactiveForeground		Color	used if not enabled (yes, this is confusing; this should be named disabledForeground)
+ * @uiDefault FormattedTextField.border					Border
+ * @uiDefault FormattedTextField.margin					Insets
+ * @uiDefault FormattedTextField.caretBlinkRate			int		default is 500 milliseconds
+ *
+ * <!-- FlatTextFieldUI -->
+ *
+ * @uiDefault Component.focusWidth						int
+ * @uiDefault Component.minimumWidth					int
+ * @uiDefault Component.isIntelliJTheme					boolean
+ * @uiDefault FormattedTextField.placeholderForeground	Color
+ *
  * @author Karl Tauber
  */
 public class FlatFormattedTextFieldUI

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

@@ -20,12 +20,14 @@ import java.awt.Color;
 import java.awt.FontMetrics;
 import java.awt.Graphics;
 import java.awt.Rectangle;
+import java.beans.PropertyChangeEvent;
 import javax.swing.Icon;
 import javax.swing.JComponent;
 import javax.swing.JLabel;
 import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
+import javax.swing.plaf.basic.BasicHTML;
 import javax.swing.plaf.basic.BasicLabelUI;
 import com.formdev.flatlaf.FlatLaf;
 import com.formdev.flatlaf.util.UIScale;
@@ -33,10 +35,15 @@ import com.formdev.flatlaf.util.UIScale;
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JLabel}.
  *
+ * <!-- BasicLabelUI -->
+ *
+ * @uiDefault Label.font				Font
  * @uiDefault Label.background			Color	only used if opaque
  * @uiDefault Label.foreground			Color
+ *
+ * <!-- FlatLabelUI -->
+ *
  * @uiDefault Label.disabledForeground	Color
- * @uiDefault Label.font				Font
  *
  * @author Karl Tauber
  */
@@ -72,6 +79,51 @@ public class FlatLabelUI
 		defaults_initialized = false;
 	}
 
+	@Override
+	protected void installComponents( JLabel c ) {
+		super.installComponents( c );
+
+		// update HTML renderer if necessary
+		updateHTMLRenderer( c, c.getText(), false );
+	}
+
+	@Override
+	public void propertyChange( PropertyChangeEvent e ) {
+		String name = e.getPropertyName();
+		if( name == "text" || name == "font" || name == "foreground" ) {
+			JLabel label = (JLabel) e.getSource();
+			updateHTMLRenderer( label, label.getText(), true );
+		} else
+			super.propertyChange( e );
+	}
+
+	/**
+	 * Checks whether text contains HTML headings and adds a special CSS rule to
+	 * re-calculate heading font sizes based on current component font size.
+	 */
+	static void updateHTMLRenderer( JComponent c, String text, boolean always ) {
+		if( BasicHTML.isHTMLString( text ) &&
+			c.getClientProperty( "html.disable" ) != Boolean.TRUE &&
+			text.contains( "<h" ) &&
+			(text.contains( "<h1" ) || text.contains( "<h2" ) || text.contains( "<h3" ) ||
+			 text.contains( "<h4" ) || text.contains( "<h5" ) || text.contains( "<h6" )) )
+		{
+			int headIndex = text.indexOf( "<head>" );
+
+			String style = "<style>BASE_SIZE " + c.getFont().getSize() + "</style>";
+			if( headIndex < 0 )
+				style = "<head>" + style + "</head>";
+
+			int insertIndex = headIndex >= 0 ? (headIndex + "<head>".length()) : "<html>".length();
+			text = text.substring( 0, insertIndex )
+				+ style
+				+ text.substring( insertIndex );
+		} else if( !always )
+			return; // not necessary to invoke BasicHTML.updateRenderer()
+
+		BasicHTML.updateRenderer( c, text );
+	}
+
 	@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

@@ -48,7 +48,7 @@ public class FlatLineBorder
 		try {
 			FlatUIUtils.setRenderingHints( g2 );
 			g2.setColor( lineColor );
-			FlatUIUtils.drawRoundRectangle( g2, x, y, width, height, 0f, scale( 1f ), 0f );
+			FlatUIUtils.paintComponentBorder( g2, x, y, width, height, 0f, scale( 1f ), 0f );
 		} finally {
 			g2.dispose();
 		}

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

@@ -0,0 +1,88 @@
+/*
+ * Copyright 2019 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
+ *
+ *     http://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.Component;
+import java.awt.Graphics;
+import javax.swing.JList;
+import javax.swing.SwingUtilities;
+import javax.swing.UIManager;
+
+/**
+ * Cell border for {@link javax.swing.DefaultListCellRenderer}
+ * (used by {@link javax.swing.JList}).
+ * <p>
+ * Uses separate cell margins from UI defaults to allow easy customizing.
+ *
+ * @author Karl Tauber
+ */
+public class FlatListCellBorder
+	extends FlatLineBorder
+{
+	final boolean showCellFocusIndicator = UIManager.getBoolean( "List.showCellFocusIndicator" );
+
+	protected FlatListCellBorder() {
+		super( UIManager.getInsets( "List.cellMargins" ), UIManager.getColor( "List.cellFocusColor" ) );
+	}
+
+	//---- class Default ------------------------------------------------------
+
+	/**
+	 * Border for unselected cell that uses margins, but does not paint focus indicator border.
+	 */
+	public static class Default
+		extends FlatListCellBorder
+	{
+		@Override
+		public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
+			// do not paint focus indicator border
+		}
+	}
+
+	//---- class Focused ------------------------------------------------------
+
+	/**
+	 * Border for focused unselected cell that uses margins and paints focus indicator border.
+	 */
+	public static class Focused
+		extends FlatListCellBorder
+	{
+	}
+
+	//---- class Selected -----------------------------------------------------
+
+	/**
+	 * Border for selected cell that uses margins and paints focus indicator border
+	 * if enabled (List.showCellFocusIndicator=true) and exactly one item is selected.
+	 */
+	public static class Selected
+		extends FlatListCellBorder
+	{
+		@Override
+		public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
+			if( !showCellFocusIndicator )
+				return;
+
+			// paint focus indicator border only if exactly one item is selected
+			JList<?> list = (JList<?>) SwingUtilities.getAncestorOfClass( JList.class, c );
+			if( list != null && list.getMinSelectionIndex() == list.getMaxSelectionIndex() )
+				return;
+
+			super.paintBorder( c, g, x, y, width, height );
+		}
+	}
+}

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

@@ -27,11 +27,37 @@ import javax.swing.plaf.basic.BasicListUI;
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JList}.
  *
- * TODO document used UI defaults of superclass
+ * <!-- BasicListUI -->
+ *
+ * @uiDefault List.font								Font
+ * @uiDefault List.background						Color
+ * @uiDefault List.foreground						Color
+ * @uiDefault List.selectionBackground				Color
+ * @uiDefault List.selectionForeground				Color
+ * @uiDefault List.dropLineColor					Color
+ * @uiDefault List.border							Border
+ * @uiDefault List.cellRenderer						ListCellRenderer
+ * @uiDefault FileChooser.listFont					Font		used if client property List.isFileList is true
+ *
+ * <!-- DefaultListCellRenderer -->
+ *
+ * @uiDefault List.cellNoFocusBorder				Border
+ * @uiDefault List.focusCellHighlightBorder			Border
+ * @uiDefault List.focusSelectedCellHighlightBorder	Border
+ * @uiDefault List.dropCellBackground				Color
+ * @uiDefault List.dropCellForeground				Color
+ *
+ * <!-- FlatListUI -->
  *
  * @uiDefault List.selectionInactiveBackground		Color
  * @uiDefault List.selectionInactiveForeground		Color
  *
+ * <!-- FlatListCellBorder -->
+ *
+ * @uiDefault List.cellMargins						Insets
+ * @uiDefault List.cellFocusColor					Color
+ * @uiDefault List.showCellFocusIndicator			boolean
+ *
  * @author Karl Tauber
  */
 public class FlatListUI

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

@@ -23,6 +23,13 @@ import javax.swing.plaf.basic.BasicMenuBarUI;
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JMenuBar}.
  *
+ * <!-- BasicMenuBarUI -->
+ *
+ * @uiDefault MenuBar.font								Font
+ * @uiDefault MenuBar.background						Color
+ * @uiDefault MenuBar.foreground						Color
+ * @uiDefault MenuBar.border							Border
+ *
  * @author Karl Tauber
  */
 public class FlatMenuBarUI

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

@@ -25,6 +25,26 @@ import javax.swing.plaf.basic.BasicMenuItemUI;
 /**
  * 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
+ *
  * @author Karl Tauber
  */
 public class FlatMenuItemUI

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

@@ -25,6 +25,29 @@ import javax.swing.plaf.basic.BasicMenuUI;
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JMenu}.
  *
+ * <!-- 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
+ *
  * @author Karl Tauber
  */
 public class FlatMenuUI

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

@@ -19,27 +19,35 @@ package com.formdev.flatlaf.ui;
 import java.awt.Component;
 import java.awt.Container;
 import java.awt.Dimension;
+import java.awt.Graphics;
 import java.awt.GridBagConstraints;
+import java.awt.Insets;
 import javax.swing.JComponent;
+import javax.swing.JPanel;
 import javax.swing.UIManager;
+import javax.swing.border.Border;
 import javax.swing.plaf.ComponentUI;
+import javax.swing.plaf.UIResource;
+import javax.swing.plaf.basic.BasicHTML;
 import javax.swing.plaf.basic.BasicOptionPaneUI;
 import com.formdev.flatlaf.util.UIScale;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JOptionPane}.
  *
+ * <!-- BasicOptionPaneUI -->
+ *
+ * @uiDefault OptionPane.font						Font	unused
+ * @uiDefault OptionPane.background					Color
+ * @uiDefault OptionPane.foreground					Color	unused
  * @uiDefault OptionPane.border						Border
  * @uiDefault OptionPane.messageAreaBorder			Border
  * @uiDefault OptionPane.buttonAreaBorder			Border
- * @uiDefault OptionPane.messageForeground			Color
- * @uiDefault OptionPane.messageFont				Font
- * @uiDefault OptionPane.buttonFont					Font
+ * @uiDefault OptionPane.messageForeground			Color	optional; defaults to Label.foreground
+ * @uiDefault OptionPane.messageFont				Font	optional; defaults to Label.font
+ * @uiDefault OptionPane.buttonFont					Font	optional; defaults to Button.font
  *
  * @uiDefault OptionPane.minimumSize				Dimension
- * @uiDefault OptionPane.maxCharactersPerLine		int
- * @uiDefault OptionPane.iconMessageGap				int
- * @uiDefault OptionPane.messagePadding				int
  * @uiDefault OptionPane.buttonPadding				int
  * @uiDefault OptionPane.buttonMinimumWidth			int		-1=disabled
  * @uiDefault OptionPane.sameSizeButtons			boolean	if true, gives all buttons same size
@@ -52,6 +60,25 @@ import com.formdev.flatlaf.util.UIScale;
  * @uiDefault OptionPane.questionIcon				Icon
  * @uiDefault OptionPane.warningIcon				Icon
  *
+ * @uiDefault OptionPane.okButtonText				String
+ * @uiDefault OptionPane.okButtonMnemonic			String
+ * @uiDefault OptionPane.okIcon						Icon
+ * @uiDefault OptionPane.cancelButtonText			String
+ * @uiDefault OptionPane.cancelButtonMnemonic		String
+ * @uiDefault OptionPane.cancelIcon					Icon
+ * @uiDefault OptionPane.yesButtonText				String
+ * @uiDefault OptionPane.yesButtonMnemonic			String
+ * @uiDefault OptionPane.yesIcon					Icon
+ * @uiDefault OptionPane.noButtonText				String
+ * @uiDefault OptionPane.noButtonMnemonic			String
+ * @uiDefault OptionPane.noIcon						Icon
+ *
+ * <!-- FlatOptionPaneUI -->
+ *
+ * @uiDefault OptionPane.iconMessageGap				int
+ * @uiDefault OptionPane.messagePadding				int
+ * @uiDefault OptionPane.maxCharactersPerLine		int
+ *
  * @author Karl Tauber
  */
 public class FlatOptionPaneUI
@@ -76,6 +103,13 @@ public class FlatOptionPaneUI
 		focusWidth = UIManager.getInt( "Component.focusWidth" );
 	}
 
+	@Override
+	protected void installComponents() {
+		super.installComponents();
+
+		updateChildPanels( optionPane );
+	}
+
 	@Override
 	public Dimension getMinimumOptionPaneSize() {
 		return UIScale.scale( super.getMinimumOptionPaneSize() );
@@ -122,9 +156,33 @@ public class FlatOptionPaneUI
 		if( messagePadding > 0 )
 			cons.insets.bottom = UIScale.scale( messagePadding );
 
+		// disable line wrapping for HTML
+		if( msg instanceof String && BasicHTML.isHTMLString( (String) msg ) )
+			maxll = Integer.MAX_VALUE;
+
 		super.addMessageComponents( container, cons, msg, maxll, internallyCreated );
 	}
 
+	private void updateChildPanels( Container c ) {
+		for( Component child : c.getComponents() ) {
+			if( child instanceof JPanel ) {
+				JPanel panel = (JPanel)child;
+
+				// make sub-panel non-opaque for OptionPane.background
+				panel.setOpaque( false );
+
+				// use non-UIResource borders to avoid that they are replaced when switching LaF
+				Border border = panel.getBorder();
+				if( border instanceof UIResource )
+					panel.setBorder( new NonUIResourceBorder( border ) );
+			}
+
+			if( child instanceof Container ) {
+				updateChildPanels( (Container) child );
+			}
+		}
+	}
+
 	private Component findByName( Container c, String name ) {
 		for( Component child : c.getComponents() ) {
 			if( name.equals( child.getName() ) )
@@ -138,4 +196,31 @@ public class FlatOptionPaneUI
 		}
 		return null;
 	}
+
+	//---- class NonUIResourceBorder ------------------------------------------
+
+	private static class NonUIResourceBorder
+		implements Border
+	{
+		private final Border delegate;
+
+		NonUIResourceBorder( Border delegate ) {
+			this.delegate = delegate;
+		}
+
+		@Override
+		public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
+			delegate.paintBorder( c, g, x, y, width, height );
+		}
+
+		@Override
+		public Insets getBorderInsets( Component c ) {
+			return delegate.getBorderInsets( c );
+		}
+
+		@Override
+		public boolean isBorderOpaque() {
+			return delegate.isBorderOpaque();
+		}
+	}
 }

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

@@ -17,26 +17,44 @@
 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.event.FocusEvent;
 import java.awt.event.FocusListener;
+import java.beans.PropertyChangeEvent;
 import javax.swing.JComponent;
 import javax.swing.LookAndFeel;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicPasswordFieldUI;
-import javax.swing.text.JTextComponent;
+import com.formdev.flatlaf.FlatClientProperties;
 import com.formdev.flatlaf.util.SystemInfo;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JPasswordField}.
  *
- * TODO document used UI defaults of superclass
+ * <!-- BasicPasswordFieldUI -->
  *
- * @uiDefault Component.focusWidth				int
- * @uiDefault Component.minimumWidth			int
+ * @uiDefault PasswordField.font					Font
+ * @uiDefault PasswordField.background				Color
+ * @uiDefault PasswordField.foreground				Color	also used if not editable
+ * @uiDefault PasswordField.caretForeground			Color
+ * @uiDefault PasswordField.selectionBackground		Color
+ * @uiDefault PasswordField.selectionForeground		Color
+ * @uiDefault PasswordField.disabledBackground		Color	used if not enabled
+ * @uiDefault PasswordField.inactiveBackground		Color	used if not editable
+ * @uiDefault PasswordField.inactiveForeground		Color	used if not enabled (yes, this is confusing; this should be named disabledForeground)
+ * @uiDefault PasswordField.border					Border
+ * @uiDefault PasswordField.margin					Insets
+ * @uiDefault PasswordField.echoChar				character
+ * @uiDefault PasswordField.caretBlinkRate			int		default is 500 milliseconds
+ *
+ * <!-- FlatPasswordFieldUI -->
+ *
+ * @uiDefault Component.focusWidth					int
+ * @uiDefault Component.minimumWidth				int
+ * @uiDefault Component.isIntelliJTheme				boolean
+ * @uiDefault PasswordField.placeholderForeground	Color
  *
  * @author Karl Tauber
  */
@@ -45,8 +63,10 @@ public class FlatPasswordFieldUI
 {
 	protected int focusWidth;
 	protected int minimumWidth;
+	protected boolean isIntelliJTheme;
+	protected Color placeholderForeground;
 
-	private Handler handler;
+	private FocusListener focusListener;
 
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatPasswordFieldUI();
@@ -60,8 +80,13 @@ public class FlatPasswordFieldUI
 		if( SystemInfo.IS_MAC )
 			LookAndFeel.installProperty( getComponent(), "echoChar", '\u2022' );
 
+		String prefix = getPropertyPrefix();
 		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 );
 
 		MigLayoutVisualPadding.install( getComponent(), focusWidth );
 	}
@@ -70,6 +95,8 @@ public class FlatPasswordFieldUI
 	protected void uninstallDefaults() {
 		super.uninstallDefaults();
 
+		placeholderForeground = null;
+
 		MigLayoutVisualPadding.uninstall( getComponent() );
 	}
 
@@ -77,71 +104,52 @@ public class FlatPasswordFieldUI
 	protected void installListeners() {
 		super.installListeners();
 
-		getComponent().addFocusListener( getHandler() );
+		focusListener = new FlatUIUtils.RepaintFocusListener( getComponent() );
+		getComponent().addFocusListener( focusListener );
 	}
 
 	@Override
 	protected void uninstallListeners() {
 		super.uninstallListeners();
 
-		getComponent().removeFocusListener( getHandler() );
-
-		handler = null;
+		getComponent().removeFocusListener( focusListener );
+		focusListener = null;
 	}
 
-	public Handler getHandler() {
-		if( handler == null )
-			handler = new Handler();
-		return handler;
+	@Override
+	protected void propertyChange( PropertyChangeEvent e ) {
+		super.propertyChange( e );
+
+		if( FlatClientProperties.PLACEHOLDER_TEXT.equals( e.getPropertyName() ) )
+			getComponent().repaint();
+	}
+
+	@Override
+	protected void paintSafely( Graphics g ) {
+		FlatTextFieldUI.paintBackground( g, getComponent(), focusWidth, isIntelliJTheme );
+		FlatTextFieldUI.paintPlaceholder( g, getComponent(), placeholderForeground );
+		super.paintSafely( g );
 	}
 
 	@Override
 	protected void paintBackground( Graphics g ) {
-		JTextComponent c = getComponent();
-
-		FlatUIUtils.paintParentBackground( g, c );
-
-		Graphics2D g2 = (Graphics2D) g.create();
-		try {
-			FlatUIUtils.setRenderingHints( g2 );
-
-			float focusWidth = (c.getBorder() instanceof FlatBorder) ? scale( (float) this.focusWidth ) : 0;
-
-			g2.setColor( c.getBackground() );
-			FlatUIUtils.fillRoundRectangle( g2, 0, 0, c.getWidth(), c.getHeight(), focusWidth, 0 );
-		} finally {
-			g2.dispose();
-		}
+		// background is painted elsewhere
 	}
 
 	@Override
 	public Dimension getPreferredSize( JComponent c ) {
-		return applyMinimumWidth( super.getPreferredSize( c ) );
+		return applyMinimumWidth( super.getPreferredSize( c ), c );
 	}
 
 	@Override
 	public Dimension getMinimumSize( JComponent c ) {
-		return applyMinimumWidth( super.getMinimumSize( c ) );
+		return applyMinimumWidth( super.getMinimumSize( c ), c );
 	}
 
-	private Dimension applyMinimumWidth( Dimension size ) {
+	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;
 	}
-
-	//---- class Handler ------------------------------------------------------
-
-	private class Handler
-		implements FocusListener
-	{
-		@Override
-		public void focusGained( FocusEvent e ) {
-			getComponent().repaint();
-		}
-
-		@Override
-		public void focusLost( FocusEvent e ) {
-			getComponent().repaint();
-		}
-	}
 }

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

@@ -22,6 +22,17 @@ import javax.swing.plaf.ComponentUI;
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JPopupMenu.Separator}.
  *
+ * <!-- BasicSeparatorUI -->
+ *
+ * @uiDefault PopupMenuSeparator.background		Color	unused
+ * @uiDefault PopupMenuSeparator.foreground		Color
+ *
+ * <!-- FlatSeparatorUI -->
+ *
+ * @uiDefault PopupMenuSeparator.height			int		height (or width) of the component; may be larger than stripe
+ * @uiDefault PopupMenuSeparator.stripeWidth	int		width of the stripe
+ * @uiDefault PopupMenuSeparator.stripeIndent	int		indent of stripe from top (or left); allows positioning of stripe within component
+ *
  * @author Karl Tauber
  */
 public class FlatPopupMenuSeparatorUI

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

@@ -23,6 +23,13 @@ import javax.swing.plaf.basic.BasicPopupMenuUI;
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JPopupMenu}.
  *
+ * <!-- BasicPopupMenuUI -->
+ *
+ * @uiDefault PopupMenu.font							Font
+ * @uiDefault PopupMenu.background						Color
+ * @uiDefault PopupMenu.foreground						Color
+ * @uiDefault PopupMenu.border							Border
+ *
  * @author Karl Tauber
  */
 public class FlatPopupMenuUI

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

@@ -17,12 +17,16 @@
 package com.formdev.flatlaf.ui;
 
 import java.awt.Dimension;
+import java.awt.FontMetrics;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
 import java.awt.Insets;
+import java.awt.geom.Area;
 import java.awt.geom.RoundRectangle2D;
 import javax.swing.JComponent;
 import javax.swing.JProgressBar;
+import javax.swing.LookAndFeel;
+import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicProgressBarUI;
 import com.formdev.flatlaf.util.UIScale;
@@ -30,23 +34,72 @@ import com.formdev.flatlaf.util.UIScale;
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JProgressBar}.
  *
+ * <!-- BasicProgressBarUI -->
+ *
+ * @uiDefault ProgressBar.font						Font
+ * @uiDefault ProgressBar.background				Color
+ * @uiDefault ProgressBar.foreground				Color
+ * @uiDefault ProgressBar.selectionBackground		Color
+ * @uiDefault ProgressBar.selectionForeground		Color
+ * @uiDefault ProgressBar.border					Border
+ * @uiDefault ProgressBar.horizontalSize			Dimension	default is 146,12
+ * @uiDefault ProgressBar.verticalSize				Dimension	default is 12,146
+ * @uiDefault ProgressBar.repaintInterval			int		default is 50 milliseconds
+ * @uiDefault ProgressBar.cycleTime					int		default is 3000 milliseconds
+ *
+ * <!-- FlatProgressBarUI -->
+ *
+ * @uiDefault ProgressBar.arc						int
+ *
  * @author Karl Tauber
  */
 public class FlatProgressBarUI
 	extends BasicProgressBarUI
 {
+	protected int arc;
+	protected Dimension horizontalSize;
+	protected Dimension verticalSize;
+
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatProgressBarUI();
 	}
 
+	@Override
+	protected void installDefaults() {
+		super.installDefaults();
+
+		LookAndFeel.installProperty( progressBar, "opaque", false );
+
+		arc = UIManager.getInt( "ProgressBar.arc" );
+		horizontalSize = UIManager.getDimension( "ProgressBar.horizontalSize" );
+		verticalSize = UIManager.getDimension( "ProgressBar.verticalSize" );
+	}
+
+	@Override
+	public Dimension getPreferredSize( JComponent c ) {
+		Dimension size = super.getPreferredSize( c );
+
+		if( progressBar.isStringPainted() ) {
+			// recalculate progress height/width to make it smaller
+			Insets insets = progressBar.getInsets();
+			FontMetrics fm = progressBar.getFontMetrics( progressBar.getFont() );
+			if( progressBar.getOrientation() == JProgressBar.HORIZONTAL )
+				size.height = Math.max( fm.getHeight() + insets.top + insets.bottom, getPreferredInnerHorizontal().height );
+			else
+				size.width = Math.max( fm.getHeight() + insets.left + insets.right, getPreferredInnerVertical().width );
+		}
+
+		return size;
+	}
+
 	@Override
 	protected Dimension getPreferredInnerHorizontal() {
-		return UIScale.scale( super.getPreferredInnerHorizontal() );
+		return UIScale.scale( horizontalSize );
 	}
 
 	@Override
 	protected Dimension getPreferredInnerVertical() {
-		return UIScale.scale( super.getPreferredInnerVertical() );
+		return UIScale.scale( verticalSize );
 	}
 
 	@Override
@@ -69,13 +122,14 @@ public class FlatProgressBarUI
 			return;
 
 		boolean horizontal = (progressBar.getOrientation() == JProgressBar.HORIZONTAL);
-		int arc = horizontal ? height : width;
+		int arc = Math.min( UIScale.scale( this.arc ), horizontal ? height : width );
 
 		FlatUIUtils.setRenderingHints( (Graphics2D) g );
 
 		// paint track
+		RoundRectangle2D.Float trackShape = new RoundRectangle2D.Float( x, y, width, height, arc, arc );
 		g.setColor( progressBar.getBackground() );
-		((Graphics2D)g).fill( new RoundRectangle2D.Float( x, y, width, height, arc, arc ) );
+		((Graphics2D)g).fill( trackShape );
 
 		// paint progress
 		if( progressBar.isIndeterminate() ) {
@@ -91,11 +145,19 @@ public class FlatProgressBarUI
 		} else {
 			int amountFull = getAmountFull( insets, width, height );
 
-			g.setColor( progressBar.getForeground() );
-			((Graphics2D)g).fill( horizontal
+			RoundRectangle2D.Float progressShape = horizontal
 				? new RoundRectangle2D.Float( c.getComponentOrientation().isLeftToRight() ? x : x + (width - amountFull),
 					y, amountFull, height, arc, arc )
-				: new RoundRectangle2D.Float( x, y + (height - amountFull), width, amountFull, arc, arc ) );
+				: new RoundRectangle2D.Float( x, y + (height - amountFull), width, amountFull, arc, arc );
+
+			g.setColor( progressBar.getForeground() );
+			if( amountFull < (horizontal ? height : width) ) {
+				// special painting for low amounts to avoid painting outside of track
+				Area area = new Area( trackShape );
+				area.intersect( new Area( progressShape ) );
+				((Graphics2D)g).fill( area );
+			} else
+				((Graphics2D)g).fill( progressShape );
 
 			if( progressBar.isStringPainted() )
 				paintString( g, x, y, width, height, amountFull, insets );

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

@@ -25,6 +25,26 @@ import javax.swing.plaf.basic.BasicRadioButtonMenuItemUI;
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JRadioButtonMenuItem}.
  *
+ * <!-- BasicRadioButtonMenuItemUI -->
+ *
+ * @uiDefault RadioButtonMenuItem.font								Font
+ * @uiDefault RadioButtonMenuItem.background						Color
+ * @uiDefault RadioButtonMenuItem.foreground						Color
+ * @uiDefault RadioButtonMenuItem.disabledForeground				Color
+ * @uiDefault RadioButtonMenuItem.selectionBackground				Color
+ * @uiDefault RadioButtonMenuItem.selectionForeground				Color
+ * @uiDefault RadioButtonMenuItem.acceleratorForeground				Color
+ * @uiDefault RadioButtonMenuItem.acceleratorSelectionForeground	Color
+ * @uiDefault MenuItem.acceleratorFont								Font		defaults to MenuItem.font
+ * @uiDefault MenuItem.acceleratorDelimiter							String
+ * @uiDefault RadioButtonMenuItem.border							Border
+ * @uiDefault RadioButtonMenuItem.borderPainted						boolean
+ * @uiDefault RadioButtonMenuItem.margin							Insets
+ * @uiDefault RadioButtonMenuItem.arrowIcon							Icon
+ * @uiDefault RadioButtonMenuItem.checkIcon							Icon
+ * @uiDefault RadioButtonMenuItem.opaque							boolean
+ * @uiDefault RadioButtonMenuItem.evenHeight						boolean
+ *
  * @author Karl Tauber
  */
 public class FlatRadioButtonMenuItemUI

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

@@ -18,22 +18,38 @@ 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.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;
 import javax.swing.plaf.ComponentUI;
+import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicRadioButtonUI;
+import com.formdev.flatlaf.icons.FlatCheckBoxIcon;
+import com.formdev.flatlaf.util.UIScale;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JRadioButton}.
  *
- * TODO document used UI defaults of superclass
+ * <!-- BasicRadioButtonUI -->
  *
- * @uiDefault Button.iconTextGap				int
- * @uiDefault Button.disabledText				Color
+ * @uiDefault RadioButton.font						Font
+ * @uiDefault RadioButton.background				Color
+ * @uiDefault RadioButton.foreground				Color
+ * @uiDefault RadioButton.border					Border
+ * @uiDefault RadioButton.margin					Insets
+ * @uiDefault RadioButton.rollover					boolean
+ * @uiDefault RadioButton.icon						Icon
+ *
+ * <!-- FlatRadioButtonUI -->
+ *
+ * @uiDefault RadioButton.iconTextGap				int
+ * @uiDefault RadioButton.disabledText				Color
  *
  * @author Karl Tauber
  */
@@ -66,6 +82,7 @@ public class FlatRadioButtonUI
 			defaults_initialized = true;
 		}
 
+		LookAndFeel.installProperty( b, "opaque", false );
 		LookAndFeel.installProperty( b, "iconTextGap", scale( iconTextGap ) );
 
 		MigLayoutVisualPadding.install( b, null );
@@ -79,8 +96,73 @@ public class FlatRadioButtonUI
 		defaults_initialized = false;
 	}
 
+	private static Insets tempInsets = new Insets( 0, 0, 0, 0 );
+
+	@Override
+	public Dimension getPreferredSize( JComponent c ) {
+		Dimension size = super.getPreferredSize( c );
+
+		// small insets fix
+		int focusWidth = getIconFocusWidth( c );
+		if( focusWidth > 0 ) {
+			// Increase preferred width and height if insets were explicitly reduced (e.g. with
+			// an EmptyBorder) and icon has a focus width, which is not included in icon size.
+			// Otherwise the component may be too small and outer focus border may be cut off.
+			Insets insets = c.getInsets( tempInsets );
+			size.width += Math.max( focusWidth - insets.left, 0 ) + Math.max( focusWidth - insets.right, 0 );
+			size.height += Math.max( focusWidth - insets.top, 0 ) + Math.max( focusWidth - insets.bottom, 0 );
+		}
+
+		return size;
+	}
+
+	@Override
+	public void paint( Graphics g, JComponent c ) {
+		// fill background even if opaque if
+		// - used as cell renderer (because of selection background)
+		// - if background was explicitly set to a non-UIResource color
+		if( !c.isOpaque() &&
+			(c.getParent() instanceof CellRendererPane || !(c.getBackground() instanceof UIResource)) )
+		{
+			g.setColor( c.getBackground() );
+			g.fillRect( 0, 0, c.getWidth(), c.getHeight() );
+		}
+
+		// small insets fix
+		int focusWidth = getIconFocusWidth( c );
+		if( focusWidth > 0 ) {
+			boolean ltr = c.getComponentOrientation().isLeftToRight();
+			Insets insets = c.getInsets( tempInsets );
+			int leftOrRightInset = ltr ? insets.left : insets.right;
+			if( focusWidth > leftOrRightInset ) {
+				// The left (or right) inset is smaller than the focus width, which may be
+				// the case if insets were explicitly reduced (e.g. with an EmptyBorder).
+				// In this case the width has been increased in getPreferredSize() and
+				// here it is necessary to fix icon and text painting location.
+				int offset = focusWidth - leftOrRightInset;
+				if( !ltr )
+					offset = -offset;
+
+				// move the graphics origin to the left (or right)
+				g.translate( offset, 0 );
+				super.paint( g, c );
+				g.translate( -offset, 0 );
+				return;
+			}
+		}
+
+		super.paint( g, c );
+	}
+
 	@Override
 	protected void paintText( Graphics g, AbstractButton b, Rectangle textRect, String text ) {
 		FlatButtonUI.paintText( g, b, textRect, text, b.isEnabled() ? b.getForeground() : disabledText );
 	}
+
+	private int getIconFocusWidth( JComponent c ) {
+		AbstractButton b = (AbstractButton) c;
+		return (b.getIcon() == null && getDefaultIcon() instanceof FlatCheckBoxIcon)
+			? UIScale.scale( ((FlatCheckBoxIcon)getDefaultIcon()).focusWidth )
+			: 0;
+	}
 }

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

@@ -17,6 +17,7 @@
 package com.formdev.flatlaf.ui;
 
 import static com.formdev.flatlaf.util.UIScale.scale;
+import java.awt.Component;
 import javax.swing.UIManager;
 
 /**
@@ -32,7 +33,7 @@ public class FlatRoundBorder
 	protected final int arc = UIManager.getInt( "Component.arc" );
 
 	@Override
-	protected float getArc() {
+	protected float getArc( Component c ) {
 		return scale( (float) arc );
 	}
 }

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

@@ -22,27 +22,41 @@ import java.awt.Graphics;
 import java.awt.Rectangle;
 import java.awt.event.MouseAdapter;
 import java.awt.event.MouseEvent;
+import java.beans.PropertyChangeEvent;
+import java.beans.PropertyChangeListener;
+import java.util.Objects;
 import javax.swing.JButton;
 import javax.swing.JComponent;
+import javax.swing.JScrollPane;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicScrollBarUI;
+import com.formdev.flatlaf.FlatClientProperties;
 import com.formdev.flatlaf.util.UIScale;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JScrollBar}.
  *
+ * <!-- BasicScrollBarUI -->
+ *
  * @uiDefault ScrollBar.background			Color
  * @uiDefault ScrollBar.foreground			Color
  * @uiDefault ScrollBar.track				Color
  * @uiDefault ScrollBar.thumb				Color
- * @uiDefault ScrollBar.hoverTrackColor		Color
- * @uiDefault ScrollBar.hoverThumbColor		Color
  * @uiDefault ScrollBar.width				int
- * @uiDefault ScrollBar.minimumThumbSize	Insets
- * @uiDefault ScrollBar.maximumThumbSize	Insets
+ * @uiDefault ScrollBar.minimumThumbSize	Dimension
+ * @uiDefault ScrollBar.maximumThumbSize	Dimension
  * @uiDefault ScrollBar.allowsAbsolutePositioning	boolean
  *
+ * <!-- FlatScrollBarUI -->
+ *
+ * @uiDefault ScrollBar.hoverTrackColor				Color
+ * @uiDefault ScrollBar.hoverThumbColor				Color
+ * @uiDefault Component.arrowType					String	triangle (default) or chevron
+ * @uiDefault ScrollBar.showButtons					boolean
+ * @uiDefault ScrollBar.buttonArrowColor			Color
+ * @uiDefault ScrollBar.buttonDisabledArrowColor	Color
+ *
  * @author Karl Tauber
  */
 public class FlatScrollBarUI
@@ -51,6 +65,11 @@ public class FlatScrollBarUI
 	protected Color hoverTrackColor;
 	protected Color hoverThumbColor;
 
+	protected boolean showButtons;
+	protected String arrowType;
+	protected Color buttonArrowColor;
+	protected Color buttonDisabledArrowColor;
+
 	private MouseAdapter hoverListener;
 	private boolean hoverTrack;
 	private boolean hoverThumb;
@@ -83,6 +102,11 @@ public class FlatScrollBarUI
 
 		hoverTrackColor = UIManager.getColor( "ScrollBar.hoverTrackColor" );
 		hoverThumbColor = UIManager.getColor( "ScrollBar.hoverThumbColor" );
+
+		showButtons = UIManager.getBoolean( "ScrollBar.showButtons" );
+		arrowType = UIManager.getString( "Component.arrowType" );
+		buttonArrowColor = UIManager.getColor( "ScrollBar.buttonArrowColor" );
+		buttonDisabledArrowColor = UIManager.getColor( "ScrollBar.buttonDisabledArrowColor" );
 	}
 
 	@Override
@@ -91,6 +115,24 @@ public class FlatScrollBarUI
 
 		hoverTrackColor = null;
 		hoverThumbColor = null;
+
+		buttonArrowColor = null;
+		buttonDisabledArrowColor = null;
+	}
+
+	@Override
+	protected PropertyChangeListener createPropertyChangeListener() {
+		return new BasicScrollBarUI.PropertyChangeHandler() {
+			@Override
+			public void propertyChange( PropertyChangeEvent e ) {
+				super.propertyChange( e );
+
+				if( FlatClientProperties.SCROLL_BAR_SHOW_BUTTONS.equals( e.getPropertyName() ) ) {
+					scrollbar.revalidate();
+					scrollbar.repaint();
+				}
+			}
+		};
 	}
 
 	@Override
@@ -100,24 +142,50 @@ public class FlatScrollBarUI
 
 	@Override
 	protected JButton createDecreaseButton( int orientation ) {
-		return createInvisibleButton();
+		return createArrowButton( orientation );
 	}
 
 	@Override
 	protected JButton createIncreaseButton( int orientation ) {
-		return createInvisibleButton();
+		return createArrowButton( orientation );
 	}
 
-	private JButton createInvisibleButton() {
-		JButton button = new JButton();
-		button.setMinimumSize( new Dimension() );
-		button.setMaximumSize( new Dimension() );
-		button.setPreferredSize( new Dimension() );
+	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() {
+		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
 	protected void paintDecreaseHighlight( Graphics g ) {
 		// do not paint

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

@@ -14,10 +14,15 @@
  * limitations under the License.
  */
 
+/*
+ * Smooth scrolling code partly based on code from IntelliJ IDEA Community Edition,
+ * which is licensed under the Apache 2.0 license. Copyright 2000-2016 JetBrains s.r.o.
+ * See: https://github.com/JetBrains/intellij-community/blob/31e1b5a8e43219b9571951bab6457cfb3012e3ef/platform/platform-api/src/com/intellij/ui/components/SmoothScrollPane.java#L141-L185
+ *
+ */
 package com.formdev.flatlaf.ui;
 
 import java.awt.Component;
-import java.awt.Container;
 import java.awt.Graphics;
 import java.awt.Insets;
 import java.awt.Rectangle;
@@ -25,19 +30,41 @@ import java.awt.event.ContainerEvent;
 import java.awt.event.ContainerListener;
 import java.awt.event.FocusEvent;
 import java.awt.event.FocusListener;
+import java.awt.event.MouseWheelEvent;
+import java.awt.event.MouseWheelListener;
 import java.beans.PropertyChangeEvent;
+import java.beans.PropertyChangeListener;
+import javax.swing.BorderFactory;
+import javax.swing.JButton;
 import javax.swing.JComponent;
+import javax.swing.JScrollBar;
 import javax.swing.JScrollPane;
+import javax.swing.JTable;
 import javax.swing.JViewport;
-import javax.swing.ScrollPaneLayout;
+import javax.swing.LookAndFeel;
+import javax.swing.ScrollPaneConstants;
+import javax.swing.Scrollable;
+import javax.swing.SwingConstants;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
-import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicScrollPaneUI;
+import com.formdev.flatlaf.FlatClientProperties;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JScrollPane}.
  *
+ * <!-- BasicScrollPaneUI -->
+ *
+ * @uiDefault ScrollPane.font				Font	unused
+ * @uiDefault ScrollPane.background			Color
+ * @uiDefault ScrollPane.foreground			Color	unused
+ * @uiDefault ScrollPane.border				Border
+ * @uiDefault ScrollPane.viewportBorder		Border
+ *
+ * <!-- FlatScrollPaneUI -->
+ *
+ * @uiDefault ScrollPane.smoothScrolling		boolean
+ *
  * @author Karl Tauber
  */
 public class FlatScrollPaneUI
@@ -53,17 +80,14 @@ public class FlatScrollPaneUI
 	public void installUI( JComponent c ) {
 		super.installUI( c );
 
-		if( scrollpane.getLayout() instanceof UIResource )
-			scrollpane.setLayout( new FlatScrollPaneLayout() );
+		int focusWidth = UIManager.getInt( "Component.focusWidth" );
+		LookAndFeel.installProperty( c, "opaque", focusWidth == 0 );
 
-		MigLayoutVisualPadding.install( scrollpane, UIManager.getInt( "Component.focusWidth" ) );
+		MigLayoutVisualPadding.install( scrollpane, focusWidth );
 	}
 
 	@Override
 	public void uninstallUI( JComponent c ) {
-		if( scrollpane.getLayout() instanceof FlatScrollPaneLayout )
-			scrollpane.setLayout( new ScrollPaneLayout.UIResource() );
-
 		MigLayoutVisualPadding.uninstall( scrollpane );
 
 		super.uninstallUI( c );
@@ -85,7 +109,172 @@ public class FlatScrollPaneUI
 		handler = null;
 	}
 
-	public Handler getHandler() {
+	@Override
+	protected MouseWheelListener createMouseWheelListener() {
+		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" ) &&
+					scrollpane.isWheelScrollingEnabled() &&
+					e.getScrollType() == MouseWheelEvent.WHEEL_UNIT_SCROLL &&
+					e.getPreciseWheelRotation() != 0 &&
+					e.getPreciseWheelRotation() != e.getWheelRotation() )
+				{
+					mouseWheelMovedSmooth( e );
+				} else
+					super.mouseWheelMoved( e );
+			}
+		};
+	}
+
+	private static final double EPSILON = 1e-5d;
+
+	private void mouseWheelMovedSmooth( MouseWheelEvent e ) {
+		// return if there is no viewport
+		JViewport viewport = scrollpane.getViewport();
+		if( viewport == null )
+			return;
+
+		// find scrollbar to scroll
+		JScrollBar scrollbar = scrollpane.getVerticalScrollBar();
+		if( scrollbar == null || !scrollbar.isVisible() || e.isShiftDown() ) {
+			scrollbar = scrollpane.getHorizontalScrollBar();
+			if( scrollbar == null || !scrollbar.isVisible() )
+				return;
+		}
+
+		// consume event
+		e.consume();
+
+		// get precise wheel rotation
+		double rotation = e.getPreciseWheelRotation();
+
+		// get unit and block increment
+		int unitIncrement;
+		int blockIncrement;
+		int orientation = scrollbar.getOrientation();
+		Component view = viewport.getView();
+		if( view instanceof Scrollable ) {
+			Scrollable scrollable = (Scrollable) view;
+
+			// Use (0, 0) view position to obtain constant unit increment of first item
+			// (which might otherwise be variable on smaller-than-unit scrolling).
+			Rectangle visibleRect = new Rectangle( viewport.getViewSize() );
+			unitIncrement = scrollable.getScrollableUnitIncrement( visibleRect, orientation, 1 );
+			blockIncrement = scrollable.getScrollableBlockIncrement( visibleRect, orientation, 1 );
+
+			if( unitIncrement > 0 ) {
+				// For the case that the first item (e.g. in a list) is larger
+				// than the other items, get the unit increment of the second item
+				// and use the smaller one.
+				if( orientation == SwingConstants.VERTICAL ) {
+					visibleRect.y += unitIncrement;
+					visibleRect.height -= unitIncrement;
+				} else {
+					visibleRect.x += unitIncrement;
+					visibleRect.width -= unitIncrement;
+				}
+				int unitIncrement2 = scrollable.getScrollableUnitIncrement( visibleRect, orientation, 1 );
+				if( unitIncrement2 > 0 )
+					unitIncrement = Math.min( unitIncrement, unitIncrement2 );
+			}
+		} else {
+			int direction = rotation < 0 ? -1 : 1;
+			unitIncrement = scrollbar.getUnitIncrement( direction );
+			blockIncrement = scrollbar.getBlockIncrement( direction );
+		}
+
+		// limit scroll amount (number of units to scroll) for small viewports
+		// (e.g. vertical scrolling in file chooser)
+		int scrollAmount = e.getScrollAmount();
+		int viewportWH = (orientation == SwingConstants.VERTICAL)
+			? viewport.getHeight()
+			: viewport.getWidth();
+		if( unitIncrement * scrollAmount > viewportWH )
+			scrollAmount = Math.max( viewportWH / unitIncrement, 1 );
+
+		// compute relative delta
+		double delta = rotation * scrollAmount * unitIncrement;
+		boolean adjustDelta = Math.abs( rotation ) < (1.0 + EPSILON);
+		double adjustedDelta = adjustDelta
+			? Math.max( -blockIncrement, Math.min( delta, blockIncrement ) )
+			: delta;
+
+		// compute new value
+		int value = scrollbar.getValue();
+		double minDelta = scrollbar.getMinimum() - value;
+		double maxDelta = scrollbar.getMaximum() - scrollbar.getModel().getExtent() - value;
+		double boundedDelta = Math.max( minDelta, Math.min( adjustedDelta, maxDelta ) );
+		int newValue = value + (int) Math.round( boundedDelta );
+
+		// set new value
+		if( newValue != value )
+			scrollbar.setValue( newValue );
+
+/*debug
+		System.out.println( String.format( "%4d  %9f / %4d %4d / %12f %5s %12f / %4d %4d %4d / %12f %12f %12f / %4d",
+			e.getWheelRotation(),
+			e.getPreciseWheelRotation(),
+			unitIncrement,
+			blockIncrement,
+			delta,
+			adjustDelta,
+			adjustedDelta,
+			value,
+			scrollbar.getMinimum(),
+			scrollbar.getMaximum(),
+			minDelta,
+			maxDelta,
+			boundedDelta,
+			newValue ) );
+*/
+	}
+
+	@Override
+	protected PropertyChangeListener createPropertyChangeListener() {
+		return new BasicScrollPaneUI.PropertyChangeHandler() {
+			@Override
+			public void propertyChange( PropertyChangeEvent e ) {
+				super.propertyChange( e );
+
+				switch( e.getPropertyName() ) {
+					case FlatClientProperties.SCROLL_BAR_SHOW_BUTTONS:
+						JScrollBar vsb = scrollpane.getVerticalScrollBar();
+						JScrollBar hsb = scrollpane.getHorizontalScrollBar();
+						if( vsb != null ) {
+							vsb.revalidate();
+							vsb.repaint();
+						}
+						if( hsb != null ) {
+							hsb.revalidate();
+							hsb.repaint();
+						}
+						break;
+
+					case ScrollPaneConstants.LOWER_LEFT_CORNER:
+					case ScrollPaneConstants.LOWER_RIGHT_CORNER:
+					case ScrollPaneConstants.UPPER_LEFT_CORNER:
+					case ScrollPaneConstants.UPPER_RIGHT_CORNER:
+						// remove border from buttons added to corners
+						Object corner = e.getNewValue();
+						if( corner instanceof JButton &&
+							((JButton)corner).getBorder() instanceof FlatButtonBorder &&
+							scrollpane.getViewport() != null &&
+							scrollpane.getViewport().getView() instanceof JTable )
+						{
+							((JButton)corner).setBorder( BorderFactory.createEmptyBorder() );
+							((JButton)corner).setFocusable( false );
+						}
+					break;
+				}
+			}
+		};
+	}
+
+	private Handler getHandler() {
 		if( handler == null )
 			handler = new Handler();
 		return handler;
@@ -169,27 +358,4 @@ public class FlatScrollPaneUI
 			scrollpane.repaint();
 		}
 	}
-
-	//---- class FlatScrollPaneLayout -----------------------------------------
-
-	private static class FlatScrollPaneLayout
-		extends ScrollPaneLayout
-	{
-		@Override
-		public void layoutContainer( Container parent ) {
-			super.layoutContainer( parent );
-
-			// increase height of vertical scroll bar so that it also fills the upper right corner
-			if( colHead != null && vsb != null && colHead.isVisible() && vsb.isVisible() ) {
-				Rectangle colHeadBounds = colHead.getBounds();
-				Rectangle vsbBounds = vsb.getBounds();
-
-				if( vsbBounds.y > colHeadBounds.y ) {
-					vsbBounds.height += (vsbBounds.y - colHeadBounds.y);
-					vsbBounds.y = colHeadBounds.y;
-					vsb.setBounds( vsbBounds );
-				}
-			}
-		}
-	}
 }

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

@@ -30,8 +30,13 @@ import javax.swing.plaf.basic.BasicSeparatorUI;
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JSeparator}.
  *
+ * <!-- BasicSeparatorUI -->
+ *
  * @uiDefault Separator.background		Color	unused
  * @uiDefault Separator.foreground		Color
+ *
+ * <!-- FlatSeparatorUI -->
+ *
  * @uiDefault Separator.height			int		height (or width) of the component; may be larger than stripe
  * @uiDefault Separator.stripeWidth		int		width of the stripe
  * @uiDefault Separator.stripeIndent	int		indent of stripe from top (or left); allows positioning of stripe within component

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

@@ -25,6 +25,7 @@ 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.UIManager;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicSliderUI;
@@ -33,21 +34,27 @@ import com.formdev.flatlaf.util.UIScale;
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JSlider}.
  *
+ * <!-- BasicSliderUI -->
+ *
  * @uiDefault Slider.font					Font
  * @uiDefault Slider.background				Color
  * @uiDefault Slider.foreground				Color	unused
- * @uiDefault Slider.disabledForeground		Color	used for track and thumb if disabled
- * @uiDefault Slider.trackColor				Color
- * @uiDefault Slider.thumbColor				Color
  * @uiDefault Slider.tickColor				Color
- * @uiDefault Slider.focusedColor			Color
- * @uiDefault Slider.hoverColor				Color	optional; defaults to Slider.focusedColor
- * @uiDefault Slider.trackWidth				int
- * @uiDefault Slider.thumbWidth				int
  * @uiDefault Slider.horizontalSize			Dimension	preferred horizontal size; height is ignored; computed slider height is used
  * @uiDefault Slider.verticalSize			Dimension	preferred vertical size; width is ignored; computed slider width is used
  * @uiDefault Slider.minimumHorizontalSize	Dimension	height is ignored; computed slider height is used
  * @uiDefault Slider.minimumVerticalSize	Dimension	width is ignored; computed slider width is used
+ * @uiDefault Slider.border					Border
+ *
+ * <!-- FlatSliderUI -->
+ *
+ * @uiDefault Slider.trackWidth				int
+ * @uiDefault Slider.thumbWidth				int
+ * @uiDefault Slider.trackColor				Color
+ * @uiDefault Slider.thumbColor				Color
+ * @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
  *
  * @author Karl Tauber
  */
@@ -96,12 +103,14 @@ public class FlatSliderUI
 	protected void installDefaults( JSlider slider ) {
 		super.installDefaults( slider );
 
+		LookAndFeel.installProperty( slider, "opaque", false );
+
 		trackWidth = UIManager.getInt( "Slider.trackWidth" );
 		thumbWidth = UIManager.getInt( "Slider.thumbWidth" );
 
 		trackColor = UIManager.getColor( "Slider.trackColor" );
 		thumbColor = UIManager.getColor( "Slider.thumbColor" );
-		focusColor = UIManager.getColor( "Slider.focusedColor" );
+		focusColor = FlatUIUtils.getUIColor( "Slider.focusedColor", "Component.focusColor" );
 		hoverColor = FlatUIUtils.getUIColor( "Slider.hoverColor", focusColor );
 		disabledForeground = UIManager.getColor( "Slider.disabledForeground" );
 	}
@@ -170,9 +179,15 @@ public class FlatSliderUI
 		if( slider.getOrientation() == JSlider.HORIZONTAL ) {
 			float y = trackRect.y + (trackRect.height - tw) / 2f;
 			if( enabled && isRoundThumb() ) {
-				int cw = thumbRect.x + (thumbRect.width / 2) - trackRect.x;
-				coloredTrack = new RoundRectangle2D.Float( trackRect.x, y, cw, tw, arc, arc );
-				track = new RoundRectangle2D.Float( trackRect.x + cw, y, trackRect.width - cw, tw, arc, arc );
+				if( slider.getComponentOrientation().isLeftToRight() ) {
+					int cw = thumbRect.x + (thumbRect.width / 2) - trackRect.x;
+					coloredTrack = new RoundRectangle2D.Float( trackRect.x, y, cw, tw, arc, arc );
+					track = new RoundRectangle2D.Float( trackRect.x + cw, y, trackRect.width - cw, tw, arc, arc );
+				} else {
+					int cw = trackRect.x + trackRect.width - thumbRect.x - (thumbRect.width / 2);
+					coloredTrack = new RoundRectangle2D.Float( trackRect.x + trackRect.width - cw, y, cw, tw, arc, arc );
+					track = new RoundRectangle2D.Float( trackRect.x, y, trackRect.width - cw, tw, arc, arc );
+				}
 			} else
 				track = new RoundRectangle2D.Float( trackRect.x, y, trackRect.width, tw, arc, arc );
 		} else {
@@ -186,7 +201,7 @@ public class FlatSliderUI
 		}
 
 		if( coloredTrack != null ) {
-			g.setColor( slider.hasFocus() ? focusColor : (hover ? hoverColor : thumbColor) );
+			FlatUIUtils.setColor( g, slider.hasFocus() ? focusColor : (hover ? hoverColor : thumbColor), thumbColor );
 			((Graphics2D)g).fill( coloredTrack );
 		}
 
@@ -196,9 +211,10 @@ public class FlatSliderUI
 
 	@Override
 	public void paintThumb( Graphics g ) {
-		g.setColor( slider.isEnabled()
+		FlatUIUtils.setColor( g, slider.isEnabled()
 			? (slider.hasFocus() ? focusColor : (hover ? hoverColor : thumbColor))
-			: disabledForeground );
+			: disabledForeground,
+			thumbColor );
 
 		if( isRoundThumb() )
 			g.fillOval( thumbRect.x, thumbRect.y, thumbRect.width, thumbRect.height );

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

@@ -35,6 +35,7 @@ import java.beans.PropertyChangeListener;
 import javax.swing.JComponent;
 import javax.swing.JSpinner;
 import javax.swing.JTextField;
+import javax.swing.LookAndFeel;
 import javax.swing.SwingConstants;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
@@ -43,12 +44,23 @@ import javax.swing.plaf.basic.BasicSpinnerUI;
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JSpinner}.
  *
- * TODO document used UI defaults of superclass
+ * <!-- BasicSpinnerUI -->
+ *
+ * @uiDefault Spinner.font						Font
+ * @uiDefault Spinner.background				Color
+ * @uiDefault Spinner.foreground				Color
+ * @uiDefault Spinner.border					Border
+ * @uiDefault Spinner.disableOnBoundaryValues	boolean	default is false
+ * @uiDefault Spinner.editorAlignment			int		0=center, 2=left, 4=right, 10=leading, 11=trailing
+ * @uiDefault Spinner.editorBorderPainted		boolean	paint inner editor border; defaults to false
+ *
+ * <!-- FlatSpinnerUI -->
  *
  * @uiDefault Component.focusWidth				int
  * @uiDefault Component.arc						int
  * @uiDefault Component.minimumWidth			int
  * @uiDefault Component.arrowType				String	triangle (default) or chevron
+ * @uiDefault Component.isIntelliJTheme			boolean
  * @uiDefault Component.borderColor				Color
  * @uiDefault Component.disabledBorderColor		Color
  * @uiDefault Spinner.disabledBackground		Color
@@ -70,6 +82,7 @@ public class FlatSpinnerUI
 	protected int arc;
 	protected int minimumWidth;
 	protected String arrowType;
+	protected boolean isIntelliJTheme;
 	protected Color borderColor;
 	protected Color disabledBorderColor;
 	protected Color disabledBackground;
@@ -88,10 +101,13 @@ public class FlatSpinnerUI
 	protected void installDefaults() {
 		super.installDefaults();
 
+		LookAndFeel.installProperty( spinner, "opaque", false );
+
 		focusWidth = UIManager.getInt( "Component.focusWidth" );
 		arc = UIManager.getInt( "Component.arc" );
 		minimumWidth = UIManager.getInt( "Component.minimumWidth" );
 		arrowType = UIManager.getString( "Component.arrowType" );
+		isIntelliJTheme = UIManager.getBoolean( "Component.isIntelliJTheme" );
 		borderColor = UIManager.getColor( "Component.borderColor" );
 		disabledBorderColor = UIManager.getColor( "Component.disabledBorderColor" );
 		disabledBackground = UIManager.getColor( "Spinner.disabledBackground" );
@@ -143,7 +159,7 @@ public class FlatSpinnerUI
 		handler = null;
 	}
 
-	public Handler getHandler() {
+	private Handler getHandler() {
 		if( handler == null )
 			handler = new Handler();
 		return handler;
@@ -152,6 +168,13 @@ public class FlatSpinnerUI
 	@Override
 	protected JComponent createEditor() {
 		JComponent editor = super.createEditor();
+
+		// explicitly make non-opaque
+		editor.setOpaque( false );
+		JTextField textField = getEditorTextField( editor );
+		if( textField != null )
+			textField.setOpaque( false );
+
 		updateEditorColors();
 		return editor;
 	}
@@ -183,8 +206,6 @@ 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.setBackground( FlatUIUtils.nonUIResource( spinner.isEnabled()
-				? spinner.getBackground() : disabledBackground ) );
 			textField.setForeground( FlatUIUtils.nonUIResource( spinner.getForeground() ) );
 			textField.setDisabledTextColor( FlatUIUtils.nonUIResource( disabledForeground ) );
 		}
@@ -225,45 +246,47 @@ public class FlatSpinnerUI
 
 	@Override
 	public void update( Graphics g, JComponent c ) {
-		if( c.isOpaque() ) {
+		// fill background if opaque to avoid garbage if user sets opaque to true
+		if( c.isOpaque() && (focusWidth > 0 || arc != 0) )
 			FlatUIUtils.paintParentBackground( g, c );
 
-			Graphics2D g2 = (Graphics2D) g;
-			FlatUIUtils.setRenderingHints( g2 );
+		Graphics2D g2 = (Graphics2D) g;
+		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();
+		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() : disabledBackground );
-			FlatUIUtils.fillRoundRectangle( g2, 0, 0, width, height, focusWidth, arc );
+		// paint background
+		g2.setColor( enabled
+			? c.getBackground()
+			: (isIntelliJTheme ? FlatUIUtils.getParentBackground( c ) : disabledBackground) );
+		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.fillRoundRectangle( 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 - (focusWidth * 2) ) );
+		// 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( g, c );
 	}
 
@@ -303,6 +326,7 @@ public class FlatSpinnerUI
 			Dimension editorSize = (editor != null) ? editor.getPreferredSize() : new Dimension( 0, 0 );
 
 			// 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;
 			return new Dimension(
 				Math.max( insets.left + insets.right + editorSize.width + padding.left + padding.right + innerHeight, scale( minimumWidth + (focusWidth * 2) ) ),
@@ -370,7 +394,6 @@ public class FlatSpinnerUI
 		@Override
 		public void propertyChange( PropertyChangeEvent e ) {
 			switch( e.getPropertyName() ) {
-				case "background":
 				case "foreground":
 				case "enabled":
 					updateEditorColors();

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

@@ -31,14 +31,19 @@ import com.formdev.flatlaf.util.UIScale;
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JSplitPane}.
  *
- * @uiDefault Component.arrowType						String	triangle (default) or chevron
+ * <!-- BasicSplitPaneUI -->
+ *
  * @uiDefault SplitPane.background						Color
  * @uiDefault SplitPane.foreground						Color unused
  * @uiDefault SplitPane.dividerSize						int
- * @uiDefault SplitPane.continuousLayout				boolean
  * @uiDefault SplitPane.border							Border
  * @uiDefault SplitPaneDivider.border					Border
  * @uiDefault SplitPaneDivider.draggingColor			Color	only used if continuousLayout is false
+ *
+ * <!-- FlatSplitPaneUI -->
+ *
+ * @uiDefault Component.arrowType						String	triangle (default) or chevron
+ * @uiDefault SplitPane.continuousLayout				boolean
  * @uiDefault SplitPaneDivider.oneTouchArrowColor		Color
  * @uiDefault SplitPaneDivider.oneTouchHoverArrowColor	Color
  *

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

@@ -17,12 +17,19 @@
 package com.formdev.flatlaf.ui;
 
 import static com.formdev.flatlaf.util.UIScale.scale;
+import static com.formdev.flatlaf.FlatClientProperties.*;
 import java.awt.Color;
+import java.awt.Component;
+import java.awt.Container;
 import java.awt.Font;
 import java.awt.FontMetrics;
 import java.awt.Graphics;
+import java.awt.Graphics2D;
 import java.awt.Insets;
 import java.awt.Rectangle;
+import java.awt.Shape;
+import java.awt.geom.Path2D;
+import java.awt.geom.Rectangle2D;
 import java.beans.PropertyChangeEvent;
 import java.beans.PropertyChangeListener;
 import javax.swing.JButton;
@@ -34,30 +41,47 @@ import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicTabbedPaneUI;
 import javax.swing.text.View;
 import com.formdev.flatlaf.FlatLaf;
+import com.formdev.flatlaf.util.UIScale;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JTabbedPane}.
  *
+ * @clientProperty JTabbedPane.showTabSeparators		boolean
  * @clientProperty JTabbedPane.hasFullBorder			boolean
  *
- * @uiDefault Component.arrowType						String	triangle (default) or chevron
+ * <!-- BasicTabbedPaneUI -->
+ *
  * @uiDefault TabbedPane.font							Font
  * @uiDefault TabbedPane.background						Color
  * @uiDefault TabbedPane.foreground						Color
  * @uiDefault TabbedPane.shadow							Color	used for scroll arrows and cropped line
+ * @uiDefault TabbedPane.textIconGap					int
+ * @uiDefault TabbedPane.tabInsets						Insets
+ * @uiDefault TabbedPane.selectedTabPadInsets			Insets
+ * @uiDefault TabbedPane.tabAreaInsets					Insets
+ * @uiDefault TabbedPane.tabsOverlapBorder				boolean
+ * @uiDefault TabbedPane.tabRunOverlay					int
+ * @uiDefault TabbedPane.tabsOpaque						boolean
+ * @uiDefault TabbedPane.contentOpaque					boolean	unused
+ * @uiDefault TabbedPane.opaque							boolean
+ * @uiDefault TabbedPane.selectionFollowsFocus			boolean	default is true
+ *
+ * <!-- FlatTabbedPaneUI -->
+ *
+ * @uiDefault Component.arrowType						String	triangle (default) or chevron
  * @uiDefault TabbedPane.disabledForeground				Color
+ * @uiDefault TabbedPane.selectedBackground				Color	optional
  * @uiDefault TabbedPane.selectedForeground				Color
  * @uiDefault TabbedPane.underlineColor					Color
  * @uiDefault TabbedPane.disabledUnderlineColor			Color
  * @uiDefault TabbedPane.hoverColor						Color
  * @uiDefault TabbedPane.focusColor						Color
+ * @uiDefault TabbedPane.tabSeparatorColor				Color	optional; defaults to TabbedPane.contentAreaColor
  * @uiDefault TabbedPane.contentAreaColor				Color
- * @uiDefault TabbedPane.textIconGap					int
- * @uiDefault TabbedPane.tabInsets						Insets
- * @uiDefault TabbedPane.tabAreaInsets					Insets
  * @uiDefault TabbedPane.tabHeight						int
  * @uiDefault TabbedPane.tabSelectionHeight				int
  * @uiDefault TabbedPane.contentSeparatorHeight			int
+ * @uiDefault TabbedPane.showTabSeparators				boolean
  * @uiDefault TabbedPane.hasFullBorder					boolean
  *
  * @author Karl Tauber
@@ -66,16 +90,19 @@ public class FlatTabbedPaneUI
 	extends BasicTabbedPaneUI
 {
 	protected Color disabledForeground;
+	protected Color selectedBackground;
 	protected Color selectedForeground;
 	protected Color underlineColor;
 	protected Color disabledUnderlineColor;
 	protected Color hoverColor;
 	protected Color focusColor;
+	protected Color tabSeparatorColor;
 	protected Color contentAreaColor;
 
 	protected int tabHeight;
 	protected int tabSelectionHeight;
 	protected int contentSeparatorHeight;
+	protected boolean showTabSeparators;
 	protected boolean hasFullBorder;
 	protected boolean tabsOverlapBorder;
 
@@ -88,16 +115,19 @@ public class FlatTabbedPaneUI
 		super.installDefaults();
 
 		disabledForeground = UIManager.getColor( "TabbedPane.disabledForeground" );
+		selectedBackground = UIManager.getColor( "TabbedPane.selectedBackground" );
 		selectedForeground = UIManager.getColor( "TabbedPane.selectedForeground" );
 		underlineColor = UIManager.getColor( "TabbedPane.underlineColor" );
 		disabledUnderlineColor = UIManager.getColor( "TabbedPane.disabledUnderlineColor" );
 		hoverColor = UIManager.getColor( "TabbedPane.hoverColor" );
 		focusColor = UIManager.getColor( "TabbedPane.focusColor" );
+		tabSeparatorColor = UIManager.getColor( "TabbedPane.tabSeparatorColor" );
 		contentAreaColor = UIManager.getColor( "TabbedPane.contentAreaColor" );
 
 		tabHeight = UIManager.getInt( "TabbedPane.tabHeight" );
 		tabSelectionHeight = UIManager.getInt( "TabbedPane.tabSelectionHeight" );
 		contentSeparatorHeight = UIManager.getInt( "TabbedPane.contentSeparatorHeight" );
+		showTabSeparators = UIManager.getBoolean( "TabbedPane.showTabSeparators" );
 		hasFullBorder = UIManager.getBoolean( "TabbedPane.hasFullBorder" );
 		tabsOverlapBorder = UIManager.getBoolean( "TabbedPane.tabsOverlapBorder" );
 
@@ -108,7 +138,6 @@ public class FlatTabbedPaneUI
 		tabAreaInsets = scale( tabAreaInsets );
 		tabHeight = scale( tabHeight );
 		tabSelectionHeight = scale( tabSelectionHeight );
-		contentSeparatorHeight = scale( contentSeparatorHeight );
 
 		MigLayoutVisualPadding.install( tabPane, null );
 	}
@@ -118,11 +147,13 @@ public class FlatTabbedPaneUI
 		super.uninstallDefaults();
 
 		disabledForeground = null;
+		selectedBackground = null;
 		selectedForeground = null;
 		underlineColor = null;
 		disabledUnderlineColor = null;
 		hoverColor = null;
 		focusColor = null;
+		tabSeparatorColor = null;
 		contentAreaColor = null;
 
 		MigLayoutVisualPadding.uninstall( tabPane );
@@ -135,9 +166,12 @@ public class FlatTabbedPaneUI
 			public void propertyChange( PropertyChangeEvent e ) {
 				super.propertyChange( e );
 
-				if( "JTabbedPane.hasFullBorder".equals( e.getPropertyName() ) ) {
-					tabPane.revalidate();
-					tabPane.repaint();
+				switch( e.getPropertyName() ) {
+					case TABBED_PANE_SHOW_TAB_SEPARATORS:
+					case TABBED_PANE_HAS_FULL_BORDER:
+						tabPane.revalidate();
+						tabPane.repaint();
+						break;
 				}
 			}
 		};
@@ -176,70 +210,45 @@ public class FlatTabbedPaneUI
 
 	@Override
 	protected int calculateTabWidth( int tabPlacement, int tabIndex, FontMetrics metrics ) {
-		return super.calculateTabWidth( tabPlacement, tabIndex, metrics ) - 3 // was added by superclass
-			+ (!isTopOrBottom( tabPlacement ) && isScrollTabLayout() ? contentSeparatorHeight : 0);
+		return super.calculateTabWidth( tabPlacement, tabIndex, metrics ) - 3 /* was added by superclass */;
 	}
 
 	@Override
 	protected int calculateTabHeight( int tabPlacement, int tabIndex, int fontHeight ) {
-		return Math.max( tabHeight, super.calculateTabHeight( tabPlacement, tabIndex, fontHeight ) - 2 /* was added by superclass */ )
-			+ (isTopOrBottom( tabPlacement ) && isScrollTabLayout() ? contentSeparatorHeight : 0);
+		return Math.max( tabHeight, super.calculateTabHeight( tabPlacement, tabIndex, fontHeight ) - 2 /* was added by superclass */ );
 	}
 
 	/**
 	 * The content border insets are used to create a separator between tabs and content.
-	 * Except in scroll tab policy, where the separator is painted in paintTabArea().
 	 * If client property JTabbedPane.hasFullBorder is true, then the content border insets
 	 * are also used for the border.
 	 */
 	@Override
 	protected Insets getContentBorderInsets( int tabPlacement ) {
-		boolean hasFullBorder = this.hasFullBorder || (tabPane.getClientProperty( "JTabbedPane.hasFullBorder" ) == Boolean.TRUE);
-		int sh = contentSeparatorHeight;
+		boolean hasFullBorder = clientPropertyBoolean( tabPane, TABBED_PANE_HAS_FULL_BORDER, this.hasFullBorder );
+		int sh = scale( contentSeparatorHeight );
 		Insets insets = hasFullBorder ? new Insets( sh, sh, sh, sh ) : new Insets( sh, 0, 0, 0 );
 
-		if( isScrollTabLayout() )
-			insets.top = 0;
-
+		Insets contentBorderInsets = new Insets( 0, 0, 0, 0 );
 		rotateInsets( insets, contentBorderInsets, tabPlacement );
 		return contentBorderInsets;
 	}
 
 	@Override
 	protected int getTabLabelShiftX( int tabPlacement, int tabIndex, boolean isSelected ) {
-		if( isScrollTabLayout() && !isTopOrBottom( tabPlacement ) ) {
-			float shift = contentSeparatorHeight / 2f;
-			return Math.round( tabPlacement == LEFT ? -shift : shift );
-		} else
-			return 0;
+		return 0;
 	}
 
 	@Override
 	protected int getTabLabelShiftY( int tabPlacement, int tabIndex, boolean isSelected ) {
-		if( isScrollTabLayout() && isTopOrBottom( tabPlacement ) ) {
-			float shift = contentSeparatorHeight / 2f;
-			return Math.round( tabPlacement == TOP ? -shift : shift );
-		} else
-			return 0;
+		return 0;
 	}
 
 	@Override
-	protected void paintTabArea( Graphics g, int tabPlacement, int selectedIndex ) {
-		if( isScrollTabLayout() ) {
-			// paint separator between tabs and content
-			Rectangle bounds = g.getClipBounds();
-			g.setColor( contentAreaColor );
+	public void update( Graphics g, JComponent c ) {
+		FlatUIUtils.setRenderingHints( (Graphics2D) g );
 
-			if( tabPlacement == TOP || tabPlacement == BOTTOM ) {
-				int y = (tabPlacement == TOP) ? bounds.y + bounds.height - contentSeparatorHeight : bounds.y;
-				g.fillRect( bounds.x, y, bounds.x + bounds.width, contentSeparatorHeight );
-			} else {
-				int x = (tabPlacement == LEFT) ? bounds.x + bounds.width - contentSeparatorHeight : bounds.x;
-				g.fillRect( x, bounds.y, contentSeparatorHeight, bounds.y + bounds.height );
-			}
-		}
-
-		super.paintTabArea( g, tabPlacement, selectedIndex );
+		super.update( g, c );
 	}
 
 	@Override
@@ -275,26 +284,15 @@ public class FlatTabbedPaneUI
 	protected void paintTabBackground( Graphics g, int tabPlacement, int tabIndex,
 		int x, int y, int w, int h, boolean isSelected )
 	{
-		if( isScrollTabLayout() ) {
-			// make tab bounds smaller for separator between tabs and content
-			if( tabPlacement == TOP || tabPlacement == BOTTOM ) {
-				if( tabPlacement == BOTTOM )
-					y += contentSeparatorHeight;
-				h -= contentSeparatorHeight;
-			} else {
-				if( tabPlacement == RIGHT )
-					x += contentSeparatorHeight;
-				w -= contentSeparatorHeight;
-			}
-		}
-
 		// paint tab background
 		boolean enabled = tabPane.isEnabled();
 		g.setColor( enabled && tabPane.isEnabledAt( tabIndex ) && getRolloverTab() == tabIndex
 			? hoverColor
 			: (enabled && isSelected && tabPane.hasFocus()
 				? focusColor
-				: tabPane.getBackgroundAt( tabIndex )) );
+				: (selectedBackground != null && enabled && isSelected
+					? selectedBackground
+					: tabPane.getBackgroundAt( tabIndex ))) );
 		g.fillRect( x, y, w, h );
 	}
 
@@ -302,8 +300,58 @@ public class FlatTabbedPaneUI
 	protected void paintTabBorder( Graphics g, int tabPlacement, int tabIndex,
 		int x, int y, int w, int h, boolean isSelected )
 	{
-		if( !isSelected )
-			return;
+		// paint tab separators
+		if( clientPropertyBoolean( tabPane, TABBED_PANE_SHOW_TAB_SEPARATORS, showTabSeparators ) &&
+			!isLastInRun( tabIndex ) )
+		{
+			float sepWidth = UIScale.scale( 1f );
+			float offset = UIScale.scale( 5f );
+
+			g.setColor( (tabSeparatorColor != null) ? tabSeparatorColor : contentAreaColor );
+			if( tabPlacement == LEFT || tabPlacement == RIGHT ) {
+				// paint tab separator at bottom side
+				((Graphics2D)g).fill( new Rectangle2D.Float( x + offset, y + h - sepWidth, w - (offset * 2), sepWidth ) );
+			} else if( tabPane.getComponentOrientation().isLeftToRight() ) {
+				// paint tab separator at right side
+				((Graphics2D)g).fill( new Rectangle2D.Float( x + w - sepWidth, y + offset, sepWidth, h - (offset * 2) ) );
+			} else {
+				// paint tab separator at left side
+				((Graphics2D)g).fill( new Rectangle2D.Float( x, y + offset, sepWidth, h - (offset * 2) ) );
+			}
+		}
+
+		if( isSelected )
+			paintTabSelection( g, tabPlacement, x, y, w, h );
+	}
+
+	protected void paintTabSelection( Graphics g, int tabPlacement,  int x, int y, int w, int h ) {
+		// increase clip bounds in scroll-tab-layout to paint over the separator line
+		Rectangle clipBounds = isScrollTabLayout() ? g.getClipBounds() : null;
+		if( clipBounds != null ) {
+			Rectangle newClipBounds = new Rectangle( clipBounds );
+			int contentSeparatorHeight = scale( this.contentSeparatorHeight );
+			switch( tabPlacement ) {
+				case TOP:
+				default:
+					newClipBounds.height += contentSeparatorHeight;
+					break;
+
+				case BOTTOM:
+					newClipBounds.y -= contentSeparatorHeight;
+					newClipBounds.height += contentSeparatorHeight;
+					break;
+
+				case LEFT:
+					newClipBounds.width += contentSeparatorHeight;
+					break;
+
+				case RIGHT:
+					newClipBounds.x -= contentSeparatorHeight;
+					newClipBounds.width += contentSeparatorHeight;
+					break;
+			}
+			g.setClip( newClipBounds );
+		}
 
 		g.setColor( tabPane.isEnabled() ? underlineColor : disabledUnderlineColor );
 
@@ -330,13 +378,16 @@ public class FlatTabbedPaneUI
 				g.fillRect( x - contentInsets.right, y, tabSelectionHeight, h );
 				break;
 		}
+
+		if( clipBounds != null )
+			g.setClip( clipBounds );
 	}
 
 	/**
-	 * Actually does the nearly the same as super.paintContentBorder() but
-	 *   - content pane is always opaque
+	 * Actually does nearly the same as super.paintContentBorder() but
 	 *   - not using UIManager.getColor("TabbedPane.contentAreaColor") to be GUI builder friendly
 	 *   - not invoking paintContentBorder*Edge() methods
+	 *   - repaint selection
 	 */
 	@Override
 	protected void paintContentBorder( Graphics g, int tabPlacement, int selectedIndex ) {
@@ -377,9 +428,34 @@ public class FlatTabbedPaneUI
 				h -= (y - insets.top);
 		}
 
+		// compute insets for separator or full border
+		boolean hasFullBorder = clientPropertyBoolean( tabPane, TABBED_PANE_HAS_FULL_BORDER, this.hasFullBorder );
+		int sh = scale( contentSeparatorHeight * 100 ); // multiply by 100 because rotateInsets() does not use floats
+		Insets ci = new Insets( 0, 0, 0, 0 );
+		rotateInsets( hasFullBorder ? new Insets( sh, sh, sh, sh ) : new Insets( sh, 0, 0, 0 ), ci, tabPlacement );
+
 		// paint content area
 		g.setColor( contentAreaColor );
-		g.fillRect( x, y, w, h );
+		Path2D path = new Path2D.Float( Path2D.WIND_EVEN_ODD );
+		path.append( new Rectangle2D.Float( x, y, w, h ), false );
+		path.append( new Rectangle2D.Float( x + (ci.left / 100f), y + (ci.top / 100f),
+			w - (ci.left / 100f) - (ci.right / 100f), h - (ci.top / 100f) - (ci.bottom / 100f) ), false );
+		((Graphics2D)g).fill( path );
+
+		// repaint selection in scroll-tab-layout because it may be painted before
+		// the content border was painted (from BasicTabbedPaneUI$ScrollableTabPanel)
+		if( isScrollTabLayout() && selectedIndex >= 0 ) {
+			Component scrollableTabViewport = findComponentByClassName( tabPane,
+				BasicTabbedPaneUI.class.getName() + "$ScrollableTabViewport" );
+			if( scrollableTabViewport != null ) {
+				Rectangle tabRect = getTabBounds( tabPane, selectedIndex );
+
+				Shape oldClip = g.getClip();
+				g.setClip( scrollableTabViewport.getBounds() );
+				paintTabSelection( g, tabPlacement, tabRect.x, tabRect.y, tabRect.width, tabRect.height );
+				g.setClip( oldClip );
+			}
+		}
 	}
 
 	@Override
@@ -388,11 +464,26 @@ public class FlatTabbedPaneUI
 	{
 	}
 
+	private boolean isLastInRun( int tabIndex ) {
+		int run = getRunForTab( tabPane.getTabCount(), tabIndex );
+		return lastTabInRun( tabPane.getTabCount(), run ) == tabIndex;
+	}
+
 	private boolean isScrollTabLayout() {
 		return tabPane.getTabLayoutPolicy() == JTabbedPane.SCROLL_TAB_LAYOUT;
 	}
 
-	private boolean isTopOrBottom( int tabPlacement ) {
-		return tabPlacement == TOP || tabPlacement == BOTTOM;
+	private Component findComponentByClassName( Container c, String className ) {
+		for( Component child : c.getComponents() ) {
+			if( className.equals( child.getClass().getName() ) )
+				return child;
+
+			if( child instanceof Container ) {
+				Component c2 = findComponentByClassName( (Container) child, className );
+				if( c2 != null )
+					return c2;
+			}
+		}
+		return null;
 	}
 }

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

@@ -0,0 +1,115 @@
+/*
+ * Copyright 2019 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
+ *
+ *     http://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.Component;
+import java.awt.Graphics;
+import javax.swing.JTable;
+import javax.swing.SwingUtilities;
+import javax.swing.UIManager;
+
+/**
+ * Cell border for {@link javax.swing.table.DefaultTableCellRenderer}
+ * (used by {@link javax.swing.JTable}).
+ * <p>
+ * Uses separate cell margins from UI defaults to allow easy customizing.
+ *
+ * @author Karl Tauber
+ */
+public class FlatTableCellBorder
+	extends FlatLineBorder
+{
+	final boolean showCellFocusIndicator = UIManager.getBoolean( "Table.showCellFocusIndicator" );
+
+	protected FlatTableCellBorder() {
+		super( UIManager.getInsets( "Table.cellMargins" ), UIManager.getColor( "Table.cellFocusColor" ) );
+	}
+
+	//---- class Default ------------------------------------------------------
+
+	/**
+	 * Border for unselected cell that uses margins, but does not paint focus indicator border.
+	 */
+	public static class Default
+		extends FlatTableCellBorder
+	{
+		@Override
+		public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
+			// do not paint focus indicator border
+		}
+	}
+
+	//---- class Focused ------------------------------------------------------
+
+	/**
+	 * Border for focused unselected cell that uses margins and paints focus indicator border.
+	 */
+	public static class Focused
+		extends FlatTableCellBorder
+	{
+	}
+
+	//---- class Selected -----------------------------------------------------
+
+	/**
+	 * Border for selected cell that uses margins and paints focus indicator border
+	 * if enabled (Table.showCellFocusIndicator=true) or at least one selected cell is editable.
+	 */
+	public static class Selected
+		extends FlatTableCellBorder
+	{
+		@Override
+		public void paintBorder( Component c, Graphics g, int x, int y, int width, int height ) {
+			if( !showCellFocusIndicator ) {
+				JTable table = (JTable) SwingUtilities.getAncestorOfClass( JTable.class, c );
+				if( table != null && !isSelectionEditable( table ) )
+					return;
+			}
+
+			super.paintBorder( c, g, x, y, width, height );
+		}
+
+		/**
+		 * Checks whether at least one selected cell is editable.
+		 */
+		private boolean isSelectionEditable( JTable table ) {
+			if( table.getRowSelectionAllowed() ) {
+				int columnCount = table.getColumnCount();
+				int[] selectedRows = table.getSelectedRows();
+				for( int selectedRow : selectedRows ) {
+					for( int column = 0; column < columnCount; column++ ) {
+						if( table.isCellEditable( selectedRow, column ) )
+							return true;
+					}
+				}
+			}
+
+			if( table.getColumnSelectionAllowed() ) {
+				int rowCount = table.getRowCount();
+				int[] selectedColumns = table.getSelectedColumns();
+				for( int selectedColumn : selectedColumns ) {
+					for( int row = 0; row < rowCount; row++ ) {
+						if( table.isCellEditable( row, selectedColumn ) )
+							return true;
+					}
+				}
+			}
+
+			return false;
+		}
+	}
+}

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

@@ -17,6 +17,7 @@
 package com.formdev.flatlaf.ui;
 
 import java.awt.Color;
+import java.awt.Component;
 import java.awt.Container;
 import java.awt.Dimension;
 import java.awt.Graphics;
@@ -29,6 +30,7 @@ import javax.swing.JTable;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicTableHeaderUI;
+import javax.swing.table.TableCellRenderer;
 import javax.swing.table.TableColumn;
 import javax.swing.table.TableColumnModel;
 import com.formdev.flatlaf.util.UIScale;
@@ -36,7 +38,13 @@ import com.formdev.flatlaf.util.UIScale;
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.table.JTableHeader}.
  *
- * TODO document used UI defaults of superclass
+ * <!-- BasicTableHeaderUI -->
+ *
+ * @uiDefault TableHeader.font					Font
+ * @uiDefault TableHeader.background			Color
+ * @uiDefault TableHeader.foreground			Color
+ *
+ * <!-- FlatTableHeaderUI -->
  *
  * @uiDefault TableHeader.separatorColor		Color
  * @uiDefault TableHeader.bottomSeparatorColor	Color
@@ -75,8 +83,14 @@ public class FlatTableHeaderUI
 	@Override
 	public void paint( Graphics g, JComponent c ) {
 		// do not paint borders if JTableHeader.setDefaultRenderer() was used
-		boolean paintBorders = header.getDefaultRenderer().getClass().getName().equals(
-			"sun.swing.table.DefaultTableCellHeaderRenderer" );
+		TableCellRenderer defaultRenderer = header.getDefaultRenderer();
+		boolean paintBorders = isSystemDefaultRenderer( defaultRenderer );
+		if( !paintBorders && header.getColumnModel().getColumnCount() > 0 ) {
+			// check whether the renderer delegates to the system default renderer
+			Component rendererComponent = defaultRenderer.getTableCellRendererComponent(
+				header.getTable(), "", false, false, -1, 0 );
+			paintBorders = isSystemDefaultRenderer( rendererComponent );
+		}
 
 		if( paintBorders )
 			paintColumnBorders( g, c );
@@ -87,6 +101,12 @@ public class FlatTableHeaderUI
 			paintDraggedColumnBorders( g, c );
 	}
 
+	private boolean isSystemDefaultRenderer( Object headerRenderer ) {
+		String rendererClassName = headerRenderer.getClass().getName();
+		return rendererClassName.equals( "sun.swing.table.DefaultTableCellHeaderRenderer" ) ||
+			   rendererClassName.equals( "sun.swing.FilePane$AlignableTableHeaderRenderer" );
+	}
+
 	private void paintColumnBorders( Graphics g, JComponent c ) {
 		int width = c.getWidth();
 		int height = c.getHeight();

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

@@ -17,6 +17,7 @@
 package com.formdev.flatlaf.ui;
 
 import java.awt.Color;
+import java.awt.Dimension;
 import java.awt.event.FocusEvent;
 import java.awt.event.FocusListener;
 import javax.swing.JComponent;
@@ -29,30 +30,84 @@ import com.formdev.flatlaf.util.UIScale;
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JTable}.
  *
- * TODO document used UI defaults of superclass
+ * <!-- BasicTableUI -->
  *
- * @uiDefault Table.rowHeight						int
- * @uiDefault Table.selectionInactiveBackground		Color
- * @uiDefault Table.selectionInactiveForeground		Color
+ * @uiDefault Table.font								Font
+ * @uiDefault Table.background							Color
+ * @uiDefault Table.foreground							Color
+ * @uiDefault Table.selectionBackground					Color
+ * @uiDefault Table.selectionForeground					Color
+ * @uiDefault Table.gridColor							Color
+ * @uiDefault Table.scrollPaneBorder					Border
+ * @uiDefault Table.dropLineColor						Color
+ * @uiDefault Table.dropLineShortColor					Color
+ *
+ * <!-- DefaultTableCellRenderer -->
+ *
+ * @uiDefault Table.cellNoFocusBorder					Border
+ * @uiDefault Table.focusCellHighlightBorder			Border
+ * @uiDefault Table.focusSelectedCellHighlightBorder	Border
+ * @uiDefault Table.dropCellBackground					Color
+ * @uiDefault Table.dropCellForeground					Color
+ * @uiDefault Table.alternateRowColor					Color
+ * @uiDefault Table.focusCellBackground					Color
+ * @uiDefault Table.focusCellForeground					Color
+ *
+ * <!-- FlatTableUI -->
+ *
+ * @uiDefault Table.rowHeight							int
+ * @uiDefault Table.showHorizontalLines					boolean
+ * @uiDefault Table.showVerticalLines					boolean
+ * @uiDefault Table.intercellSpacing					Dimension
+ * @uiDefault Table.selectionInactiveBackground			Color
+ * @uiDefault Table.selectionInactiveForeground			Color
+ *
+ * <!-- FlatTableCellBorder -->
+ *
+ * @uiDefault Table.cellMargins							Insets
+ * @uiDefault Table.cellFocusColor						Color
+ * @uiDefault Table.showCellFocusIndicator				boolean
  *
  * @author Karl Tauber
  */
 public class FlatTableUI
 	extends BasicTableUI
 {
+	protected boolean showHorizontalLines;
+	protected boolean showVerticalLines;
+	protected Dimension intercellSpacing;
+
 	protected Color selectionBackground;
 	protected Color selectionForeground;
 	protected Color selectionInactiveBackground;
 	protected Color selectionInactiveForeground;
 
+	private boolean oldShowHorizontalLines;
+	private boolean oldShowVerticalLines;
+	private Dimension oldIntercellSpacing;
+
 	public static ComponentUI createUI( JComponent c ) {
 		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();
 
+		showHorizontalLines = UIManager.getBoolean( "Table.showHorizontalLines" );
+		showVerticalLines = UIManager.getBoolean( "Table.showVerticalLines" );
+		intercellSpacing = UIManager.getDimension( "Table.intercellSpacing" );
+
 		selectionBackground = UIManager.getColor( "Table.selectionBackground" );
 		selectionForeground = UIManager.getColor( "Table.selectionForeground" );
 		selectionInactiveBackground = UIManager.getColor( "Table.selectionInactiveBackground" );
@@ -63,6 +118,20 @@ public class FlatTableUI
 		int rowHeight = FlatUIUtils.getUIInt( "Table.rowHeight", 16 );
 		if( rowHeight > 0 )
 			LookAndFeel.installProperty( table, "rowHeight", UIScale.scale( rowHeight ) );
+
+		if( !showHorizontalLines ) {
+			oldShowHorizontalLines = table.getShowHorizontalLines();
+			table.setShowHorizontalLines( false );
+		}
+		if( !showVerticalLines ) {
+			oldShowVerticalLines = table.getShowVerticalLines();
+			table.setShowVerticalLines( false );
+		}
+
+		if( intercellSpacing != null ) {
+			oldIntercellSpacing = table.getIntercellSpacing();
+			table.setIntercellSpacing( intercellSpacing );
+		}
 	}
 
 	@Override
@@ -73,6 +142,16 @@ public class FlatTableUI
 		selectionForeground = null;
 		selectionInactiveBackground = null;
 		selectionInactiveForeground = null;
+
+		// restore old show horizontal/vertical lines (if not modified)
+		if( !showHorizontalLines && oldShowHorizontalLines && !table.getShowHorizontalLines() )
+			table.setShowHorizontalLines( true );
+		if( !showVerticalLines && oldShowVerticalLines && !table.getShowVerticalLines() )
+			table.setShowVerticalLines( true );
+
+		// restore old intercell spacing (if not modified)
+		if( intercellSpacing != null && table.getIntercellSpacing().equals( intercellSpacing ) )
+			table.setIntercellSpacing( oldIntercellSpacing );
 	}
 
 	@Override

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

@@ -21,6 +21,7 @@ import java.awt.Color;
 import java.awt.Dimension;
 import java.awt.Graphics;
 import javax.swing.JComponent;
+import javax.swing.JTextArea;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.UIResource;
@@ -30,11 +31,25 @@ import javax.swing.text.JTextComponent;
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JTextArea}.
  *
- * TODO document used UI defaults of superclass
+ * <!-- BasicTextAreaUI -->
+ *
+ * @uiDefault TextArea.font						Font
+ * @uiDefault TextArea.background				Color
+ * @uiDefault TextArea.foreground				Color	also used if not editable
+ * @uiDefault TextArea.caretForeground			Color
+ * @uiDefault TextArea.selectionBackground		Color
+ * @uiDefault TextArea.selectionForeground		Color
+ * @uiDefault TextArea.inactiveForeground		Color	used if not enabled (yes, this is confusing; this should be named disabledForeground)
+ * @uiDefault TextArea.border					Border
+ * @uiDefault TextArea.margin					Insets
+ * @uiDefault TextArea.caretBlinkRate			int		default is 500 milliseconds
+ *
+ * <!-- FlatTextAreaUI -->
  *
  * @uiDefault Component.minimumWidth			int
- * @uiDefault TextArea.disabledBackground		Color
- * @uiDefault TextArea.inactiveBackground		Color
+ * @uiDefault Component.isIntelliJTheme			boolean
+ * @uiDefault TextArea.disabledBackground		Color	used if not enabled
+ * @uiDefault TextArea.inactiveBackground		Color	used if not editable
  *
  * @author Karl Tauber
  */
@@ -42,6 +57,7 @@ public class FlatTextAreaUI
 	extends BasicTextAreaUI
 {
 	protected int minimumWidth;
+	protected boolean isIntelliJTheme;
 	protected Color disabledBackground;
 	protected Color inactiveBackground;
 
@@ -54,6 +70,7 @@ public class FlatTextAreaUI
 		super.installDefaults();
 
 		minimumWidth = UIManager.getInt( "Component.minimumWidth" );
+		isIntelliJTheme = UIManager.getBoolean( "Component.isIntelliJTheme" );
 		disabledBackground = UIManager.getColor( "TextArea.disabledBackground" );
 		inactiveBackground = UIManager.getColor( "TextArea.inactiveBackground" );
 	}
@@ -73,27 +90,34 @@ public class FlatTextAreaUI
 		Color background = c.getBackground();
 		g.setColor( !(background instanceof UIResource)
 			? background
-			: (!c.isEnabled()
-				? disabledBackground
-				: (!c.isEditable() ? inactiveBackground : background)) );
+			: (isIntelliJTheme && (!c.isEnabled() || !c.isEditable())
+				? FlatUIUtils.getParentBackground( c )
+				: (!c.isEnabled()
+					? disabledBackground
+					: (!c.isEditable() ? inactiveBackground : background))) );
 		g.fillRect( 0, 0, c.getWidth(), c.getHeight() );
 	}
 
 	@Override
 	public Dimension getPreferredSize( JComponent c ) {
-		return applyMinimumWidth( super.getPreferredSize( c ) );
+		return applyMinimumWidth( super.getPreferredSize( c ), c );
 	}
 
 	@Override
 	public Dimension getMinimumSize( JComponent c ) {
-		return applyMinimumWidth( super.getMinimumSize( c ) );
+		return applyMinimumWidth( super.getMinimumSize( c ), c );
 	}
 
-	private Dimension applyMinimumWidth( Dimension size ) {
+	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;
 	}

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

@@ -17,27 +17,51 @@
 package com.formdev.flatlaf.ui;
 
 import static com.formdev.flatlaf.util.UIScale.scale;
+import java.awt.Color;
 import java.awt.Container;
 import java.awt.Dimension;
+import java.awt.FontMetrics;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
-import java.awt.event.FocusEvent;
+import java.awt.Insets;
 import java.awt.event.FocusListener;
+import java.beans.PropertyChangeEvent;
 import javax.swing.JComboBox;
 import javax.swing.JComponent;
 import javax.swing.JSpinner;
+import javax.swing.JTextField;
+import javax.swing.LookAndFeel;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
+import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicTextFieldUI;
 import javax.swing.text.JTextComponent;
+import com.formdev.flatlaf.FlatClientProperties;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JTextField}.
  *
- * TODO document used UI defaults of superclass
+ * <!-- BasicTextFieldUI -->
+ *
+ * @uiDefault TextField.font					Font
+ * @uiDefault TextField.background				Color
+ * @uiDefault TextField.foreground				Color	also used if not editable
+ * @uiDefault TextField.caretForeground			Color
+ * @uiDefault TextField.selectionBackground		Color
+ * @uiDefault TextField.selectionForeground		Color
+ * @uiDefault TextField.disabledBackground		Color	used if not enabled
+ * @uiDefault TextField.inactiveBackground		Color	used if not editable
+ * @uiDefault TextField.inactiveForeground		Color	used if not enabled (yes, this is confusing; this should be named disabledForeground)
+ * @uiDefault TextField.border					Border
+ * @uiDefault TextField.margin					Insets
+ * @uiDefault TextField.caretBlinkRate			int		default is 500 milliseconds
+ *
+ * <!-- FlatTextFieldUI -->
  *
  * @uiDefault Component.focusWidth				int
  * @uiDefault Component.minimumWidth			int
+ * @uiDefault Component.isIntelliJTheme			boolean
+ * @uiDefault TextField.placeholderForeground	Color
  *
  * @author Karl Tauber
  */
@@ -46,8 +70,10 @@ public class FlatTextFieldUI
 {
 	protected int focusWidth;
 	protected int minimumWidth;
+	protected boolean isIntelliJTheme;
+	protected Color placeholderForeground;
 
-	private Handler handler;
+	private FocusListener focusListener;
 
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatTextFieldUI();
@@ -57,8 +83,13 @@ public class FlatTextFieldUI
 	protected void installDefaults() {
 		super.installDefaults();
 
+		String prefix = getPropertyPrefix();
 		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 );
 
 		MigLayoutVisualPadding.install( getComponent(), focusWidth );
 	}
@@ -67,6 +98,8 @@ public class FlatTextFieldUI
 	protected void uninstallDefaults() {
 		super.uninstallDefaults();
 
+		placeholderForeground = null;
+
 		MigLayoutVisualPadding.uninstall( getComponent() );
 	}
 
@@ -74,43 +107,95 @@ public class FlatTextFieldUI
 	protected void installListeners() {
 		super.installListeners();
 
-		getComponent().addFocusListener( getHandler() );
+		focusListener = new FlatUIUtils.RepaintFocusListener( getComponent() );
+		getComponent().addFocusListener( focusListener );
 	}
 
 	@Override
 	protected void uninstallListeners() {
 		super.uninstallListeners();
 
-		getComponent().removeFocusListener( getHandler() );
-
-		handler = null;
+		getComponent().removeFocusListener( focusListener );
+		focusListener = null;
 	}
 
-	public Handler getHandler() {
-		if( handler == null )
-			handler = new Handler();
-		return handler;
+	@Override
+	protected void propertyChange( PropertyChangeEvent e ) {
+		super.propertyChange( e );
+
+		if( FlatClientProperties.PLACEHOLDER_TEXT.equals( e.getPropertyName() ) )
+			getComponent().repaint();
+	}
+
+	@Override
+	protected void paintSafely( Graphics g ) {
+		paintBackground( g, getComponent(), focusWidth, isIntelliJTheme );
+		paintPlaceholder( g, getComponent(), placeholderForeground );
+		super.paintSafely( g );
 	}
 
 	@Override
 	protected void paintBackground( Graphics g ) {
-		JTextComponent c = getComponent();
+		// background is painted elsewhere
+	}
 
-		FlatUIUtils.paintParentBackground( g, c );
+	static void paintBackground( Graphics g, JTextComponent c, int focusWidth, 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() && !(c.getBorder() instanceof FlatBorder) && FlatUIUtils.hasOpaqueBeenExplicitlySet( c ) )
+			return;
 
+		// fill background if opaque to avoid garbage if user sets opaque to true
+		if( c.isOpaque() && focusWidth > 0 )
+			FlatUIUtils.paintParentBackground( g, c );
+
+		// paint background
 		Graphics2D g2 = (Graphics2D) g.create();
 		try {
 			FlatUIUtils.setRenderingHints( g2 );
 
-			float focusWidth = (c.getBorder() instanceof FlatBorder) ? scale( (float) this.focusWidth ) : 0;
+			float fFocusWidth = (c.getBorder() instanceof FlatBorder) ? scale( (float) focusWidth ) : 0;
 
-			g2.setColor( c.getBackground() );
-			FlatUIUtils.fillRoundRectangle( g2, 0, 0, c.getWidth(), c.getHeight(), focusWidth, 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, 0 );
 		} finally {
 			g2.dispose();
 		}
 	}
 
+	static void paintPlaceholder( Graphics g, JTextComponent c, Color placeholderForeground ) {
+		// check whether text component is empty
+		if( c.getDocument().getLength() > 0 )
+			return;
+
+		// check for JComboBox
+		Container parent = c.getParent();
+		JComponent jc = (parent instanceof JComboBox) ? (JComboBox<?>) parent : c;
+
+		// get placeholder text
+		Object placeholder = jc.getClientProperty( FlatClientProperties.PLACEHOLDER_TEXT );
+		if( !(placeholder instanceof String) )
+			return;
+
+		// compute placeholder location
+		Insets insets = c.getInsets();
+		FontMetrics fm = c.getFontMetrics( c.getFont() );
+		int x = insets.left;
+		int y = insets.top + fm.getAscent() + ((c.getHeight() - insets.top - insets.bottom - fm.getHeight()) / 2);
+
+		// paint placeholder
+		g.setColor( placeholderForeground );
+		FlatUIUtils.drawString( c, g, (String) placeholder, x, y );
+	}
+
 	@Override
 	public Dimension getPreferredSize( JComponent c ) {
 		return applyMinimumWidth( super.getPreferredSize( c ), c );
@@ -122,29 +207,19 @@ public class FlatTextFieldUI
 	}
 
 	private Dimension applyMinimumWidth( Dimension size, JComponent c ) {
+		// do not apply minimum width if JTextField.columns is set
+		if( c instanceof JTextField && ((JTextField)c).getColumns() > 0 )
+			return size;
+
 		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) ) );
 		return size;
 	}
-
-	//---- class Handler ------------------------------------------------------
-
-	private class Handler
-		implements FocusListener
-	{
-		@Override
-		public void focusGained( FocusEvent e ) {
-			getComponent().repaint();
-		}
-
-		@Override
-		public void focusLost( FocusEvent e ) {
-			getComponent().repaint();
-		}
-	}
 }

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

@@ -18,17 +18,37 @@ package com.formdev.flatlaf.ui;
 
 import static com.formdev.flatlaf.util.UIScale.scale;
 import java.awt.Dimension;
+import java.awt.Graphics;
 import javax.swing.JComponent;
+import javax.swing.JEditorPane;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
+import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicTextPaneUI;
+import javax.swing.text.JTextComponent;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JTextPane}.
  *
- * TODO document used UI defaults of superclass
+ * <!-- BasicTextPaneUI -->
+ *
+ * @uiDefault TextPane.font						Font
+ * @uiDefault TextPane.background				Color
+ * @uiDefault TextPane.foreground				Color	also used if not editable
+ * @uiDefault TextPane.caretForeground			Color
+ * @uiDefault TextPane.selectionBackground		Color
+ * @uiDefault TextPane.selectionForeground		Color
+ * @uiDefault TextPane.disabledBackground		Color	used if not enabled
+ * @uiDefault TextPane.inactiveBackground		Color	used if not editable
+ * @uiDefault TextPane.inactiveForeground		Color	used if not enabled (yes, this is confusing; this should be named disabledForeground)
+ * @uiDefault TextPane.border					Border
+ * @uiDefault TextPane.margin					Insets
+ * @uiDefault TextPane.caretBlinkRate			int		default is 500 milliseconds
+ *
+ * <!-- FlatTextPaneUI -->
  *
  * @uiDefault Component.minimumWidth			int
+ * @uiDefault Component.isIntelliJTheme			boolean
  *
  * @author Karl Tauber
  */
@@ -36,6 +56,9 @@ public class FlatTextPaneUI
 	extends BasicTextPaneUI
 {
 	protected int minimumWidth;
+	protected boolean isIntelliJTheme;
+
+	private Object oldHonorDisplayProperties;
 
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatTextPaneUI();
@@ -46,6 +69,18 @@ public class FlatTextPaneUI
 		super.installDefaults();
 
 		minimumWidth = UIManager.getInt( "Component.minimumWidth" );
+		isIntelliJTheme = UIManager.getBoolean( "Component.isIntelliJTheme" );
+
+		// use component font and foreground for HTML text
+		oldHonorDisplayProperties = getComponent().getClientProperty( JEditorPane.HONOR_DISPLAY_PROPERTIES );
+		getComponent().putClientProperty( JEditorPane.HONOR_DISPLAY_PROPERTIES, true );
+	}
+
+	@Override
+	protected void uninstallDefaults() {
+		super.uninstallDefaults();
+
+		getComponent().putClientProperty( JEditorPane.HONOR_DISPLAY_PROPERTIES, oldHonorDisplayProperties );
 	}
 
 	@Override
@@ -63,7 +98,21 @@ public class FlatTextPaneUI
 		// 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 paintBackground( Graphics g ) {
+		JTextComponent c = getComponent();
+
+		// for compatibility with IntelliJ themes
+		if( isIntelliJTheme && (!c.isEnabled() || !c.isEditable()) && (c.getBackground() instanceof UIResource) ) {
+			FlatUIUtils.paintParentBackground( g, c );
+			return;
+		}
+
+		super.paintBackground( g );
+	}
 }

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

@@ -16,29 +16,57 @@
 
 package com.formdev.flatlaf.ui;
 
+import static com.formdev.flatlaf.FlatClientProperties.*;
 import java.awt.Color;
+import java.awt.Component;
+import java.awt.Graphics;
 import javax.swing.AbstractButton;
 import javax.swing.ButtonModel;
 import javax.swing.JComponent;
+import javax.swing.JToggleButton;
 import javax.swing.UIManager;
 import javax.swing.plaf.ComponentUI;
+import com.formdev.flatlaf.util.UIScale;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JToggleButton}.
  *
- * TODO document used UI defaults of superclass
+ * <!-- BasicButtonUI -->
+ *
+ * @uiDefault ToggleButton.font							Font
+ * @uiDefault ToggleButton.background					Color
+ * @uiDefault ToggleButton.foreground					Color
+ * @uiDefault ToggleButton.border						Border
+ * @uiDefault ToggleButton.margin						Insets
+ * @uiDefault ToggleButton.rollover						boolean
+ *
+ * <!-- FlatButtonUI -->
  *
  * @uiDefault Component.focusWidth						int
- * @uiDefault ToggleButton.arc							int
+ * @uiDefault Button.arc								int
+ * @uiDefault ToggleButton.minimumWidth					int
+ * @uiDefault ToggleButton.iconTextGap					int
+ * @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.disabledSelectedBackground	Color
- * @uiDefault ToggleButton.toolbar.hoverBackground		Color
- * @uiDefault ToggleButton.toolbar.pressedBackground	Color
  * @uiDefault ToggleButton.toolbar.selectedBackground	Color
  *
+ * @uiDefault ToggleButton.underline.underlineHeight		int
+ * @uiDefault ToggleButton.underline.underlineColor			Color
+ * @uiDefault ToggleButton.underline.disabledUnderlineColor	Color
+ * @uiDefault ToggleButton.underline.selectedBackground		Color	optional
+ * @uiDefault ToggleButton.underline.hoverBackground		Color
+ * @uiDefault ToggleButton.underline.focusBackground		Color
+ *
  *
  * @author Karl Tauber
  */
@@ -51,6 +79,13 @@ public class FlatToggleButtonUI
 
 	protected Color toolbarSelectedBackground;
 
+	protected int underlineHeight;
+	protected Color underlineColor;
+	protected Color disabledUnderlineColor;
+	protected Color underlineSelectedBackground;
+	protected Color underlineHoverBackground;
+	protected Color underlineFocusBackground;
+
 	private boolean defaults_initialized = false;
 
 	private static ComponentUI instance;
@@ -77,6 +112,13 @@ public class FlatToggleButtonUI
 
 			toolbarSelectedBackground = UIManager.getColor( "ToggleButton.toolbar.selectedBackground" );
 
+			underlineHeight = UIManager.getInt( "ToggleButton.underline.underlineHeight" );
+			underlineColor = UIManager.getColor( "ToggleButton.underline.underlineColor" );
+			disabledUnderlineColor = UIManager.getColor( "ToggleButton.underline.disabledUnderlineColor" );
+			underlineSelectedBackground = UIManager.getColor( "ToggleButton.underline.selectedBackground" );
+			underlineHoverBackground = UIManager.getColor( "ToggleButton.underline.hoverBackground" );
+			underlineFocusBackground = UIManager.getColor( "ToggleButton.underline.focusBackground" );
+
 			defaults_initialized = true;
 		}
 	}
@@ -87,6 +129,36 @@ public class FlatToggleButtonUI
 		defaults_initialized = false;
 	}
 
+	static boolean isUnderlineButton( Component c ) {
+		return c instanceof JToggleButton && clientPropertyEquals( (JToggleButton) c, BUTTON_TYPE, BUTTON_TYPE_UNDERLINE );
+	}
+
+	@Override
+	protected void paintBackground( Graphics g, JComponent c ) {
+		if( isUnderlineButton( c ) ) {
+			int height = c.getHeight();
+			int width = c.getWidth();
+			boolean selected = ((AbstractButton)c).isSelected();
+
+			// paint background
+			Color background = buttonStateColor( c,
+				selected ? underlineSelectedBackground : null,
+				null, underlineFocusBackground, underlineHoverBackground, null );
+			if( background != null ) {
+				g.setColor( background );
+				g.fillRect( 0, 0, width, height );
+			}
+
+			// paint underline if selected
+			if( selected ) {
+				int underlineHeight = UIScale.scale( this.underlineHeight );
+				g.setColor( c.isEnabled() ? underlineColor : disabledUnderlineColor );
+				g.fillRect( 0, height - underlineHeight, width, underlineHeight );
+			}
+		} else
+			super.paintBackground( g, c );
+	}
+
 	@Override
 	protected Color getBackground( JComponent c ) {
 		ButtonModel model = ((AbstractButton)c).getModel();

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

@@ -33,6 +33,8 @@ import javax.swing.plaf.basic.BasicToolBarSeparatorUI;
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JToolBar.Separator}.
  *
+ * <!-- FlatToolBarSeparatorUI -->
+ *
  * @uiDefault ToolBar.separatorWidth				int
  * @uiDefault ToolBar.separatorColor				Color
  *

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

@@ -19,6 +19,8 @@ package com.formdev.flatlaf.ui;
 import static com.formdev.flatlaf.util.UIScale.scale;
 import java.awt.Component;
 import java.awt.Insets;
+import java.awt.event.ContainerEvent;
+import java.awt.event.ContainerListener;
 import javax.swing.AbstractButton;
 import javax.swing.JComponent;
 import javax.swing.UIManager;
@@ -31,7 +33,19 @@ import javax.swing.plaf.basic.BasicToolBarUI;
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JToolBar}.
  *
- * TODO document used UI defaults of superclass
+ * <!-- BasicToolBarUI -->
+ *
+ * @uiDefault ToolBar.font								Font
+ * @uiDefault ToolBar.background						Color
+ * @uiDefault ToolBar.foreground						Color
+ * @uiDefault ToolBar.border							Border
+ * @uiDefault ToolBar.dockingBackground					Color
+ * @uiDefault ToolBar.dockingForeground					Color
+ * @uiDefault ToolBar.floatingBackground				Color
+ * @uiDefault ToolBar.floatingForeground				Color
+ * @uiDefault ToolBar.isRollover						boolean
+ *
+ * <!-- FlatToolBarUI -->
  *
  * @uiDefault ToolBar.buttonMargins						Insets
  *
@@ -53,6 +67,29 @@ public class FlatToolBarUI
 		rolloverBorder = null;
 	}
 
+	@Override
+	protected ContainerListener createToolBarContListener() {
+		return new ToolBarContListener() {
+			@Override
+			public void componentAdded( ContainerEvent e ) {
+				super.componentAdded( e );
+
+				Component c = e.getChild();
+				if( c instanceof AbstractButton )
+					c.setFocusable( false );
+			}
+
+			@Override
+			public void componentRemoved( ContainerEvent e ) {
+				super.componentRemoved( e );
+
+				Component c = e.getChild();
+				if( c instanceof AbstractButton )
+					c.setFocusable( true );
+			}
+		};
+	}
+
 	@Override
 	protected Border createRolloverBorder() {
 		return getRolloverBorder();

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

@@ -21,22 +21,35 @@ import java.awt.FontMetrics;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
 import java.awt.Insets;
+import java.beans.PropertyChangeListener;
 import java.util.List;
 import javax.swing.JComponent;
 import javax.swing.JToolTip;
 import javax.swing.SwingUtilities;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicToolTipUI;
-import com.formdev.flatlaf.FlatLaf;
+import com.formdev.flatlaf.util.StringUtils;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JToolTip}.
  *
+ * <!-- BasicToolTipUI -->
+ *
+ * @uiDefault ToolTip.font						Font
+ * @uiDefault ToolTip.background				Color
+ * @uiDefault ToolTip.foreground				Color
+ * @uiDefault ToolTip.backgroundInactive		Color
+ * @uiDefault ToolTip.foregroundInactive		Color
+ * @uiDefault ToolTip.border					Border
+ * @uiDefault ToolTip.borderInactive			Border
+ *
  * @author Karl Tauber
  */
 public class FlatToolTipUI
 	extends BasicToolTipUI
 {
+	private static PropertyChangeListener sharedPropertyChangedListener;
+
 	private static ComponentUI instance;
 
 	public static ComponentUI createUI( JComponent c ) {
@@ -45,13 +58,45 @@ public class FlatToolTipUI
 		return instance;
 	}
 
+	@Override
+	public void installUI( JComponent c ) {
+		super.installUI( c );
+
+		// update HTML renderer if necessary
+		FlatLabelUI.updateHTMLRenderer( c, ((JToolTip)c).getTipText(), false );
+	}
+
+	@Override
+	protected void installListeners( JComponent c ) {
+		super.installListeners( c );
+
+		if( sharedPropertyChangedListener == null ) {
+			sharedPropertyChangedListener = e -> {
+				String name = e.getPropertyName();
+				if( name == "text" || name == "font" || name == "foreground" ) {
+					JToolTip toolTip = (JToolTip) e.getSource();
+					FlatLabelUI.updateHTMLRenderer( toolTip, toolTip.getTipText(), false );
+				}
+			};
+		}
+
+		c.addPropertyChangeListener( sharedPropertyChangedListener );
+	}
+
+	@Override
+	protected void uninstallListeners( JComponent c ) {
+		super.uninstallListeners( c );
+
+		c.removePropertyChangeListener( sharedPropertyChangedListener );
+	}
+
 	@Override
 	public Dimension getPreferredSize( JComponent c ) {
 		if( isMultiLine( c ) ) {
 			FontMetrics fm = c.getFontMetrics( c.getFont() );
 			Insets insets = c.getInsets();
 
-			List<String> lines = FlatLaf.split( ((JToolTip)c).getTipText(), '\n' );
+			List<String> lines = StringUtils.split( ((JToolTip)c).getTipText(), '\n' );
 			int width = 0;
 			int height = fm.getHeight() * Math.max( lines.size(), 1 );
 			for( String line : lines )
@@ -71,14 +116,17 @@ public class FlatToolTipUI
 			FlatUIUtils.setRenderingHints( (Graphics2D) g );
 			g.setColor( c.getForeground() );
 
-			List<String> lines = FlatLaf.split( ((JToolTip)c).getTipText(), '\n' );
+			List<String> lines = StringUtils.split( ((JToolTip)c).getTipText(), '\n' );
 
 			int x = insets.left;
+			int x2 = c.getWidth() - insets.right;
 			int y = insets.top - fm.getDescent();
 			int lineHeight = fm.getHeight();
+			JComponent comp = ((JToolTip)c).getComponent();
+			boolean leftToRight = (comp != null ? comp : c).getComponentOrientation().isLeftToRight();
 			for( String line : lines ) {
 				y += lineHeight;
-				g.drawString( line, x, y );
+				FlatUIUtils.drawString( c, g, line, leftToRight ? x : x2 - SwingUtilities.computeStringWidth( fm, line ), y );
 			}
 		} else
 			super.paint( g, c );

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

@@ -21,9 +21,16 @@ import java.awt.Component;
 import java.awt.Graphics;
 import java.awt.Insets;
 import java.awt.Rectangle;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseListener;
+import java.beans.PropertyChangeEvent;
+import java.beans.PropertyChangeListener;
 import javax.swing.JComponent;
+import javax.swing.JTree;
 import javax.swing.LookAndFeel;
+import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
+import javax.swing.JTree.DropLocation;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicTreeUI;
 import javax.swing.tree.DefaultTreeCellRenderer;
@@ -33,13 +40,50 @@ import com.formdev.flatlaf.util.UIScale;
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JTree}.
  *
- * TODO document used UI defaults of superclass
+ * <!-- BasicTreeUI -->
+ *
+ * @uiDefault Tree.font								Font
+ * @uiDefault Tree.background						Color
+ * @uiDefault Tree.hash								Color
+ * @uiDefault Tree.dropLineColor					Color
+ * @uiDefault Tree.expandedIcon						Icon
+ * @uiDefault Tree.collapsedIcon					Icon
+ * @uiDefault Tree.leftChildIndent					int
+ * @uiDefault Tree.rightChildIndent					int
+ * @uiDefault Tree.rowHeight						int
+ * @uiDefault Tree.scrollsOnExpand					boolean
+ * @uiDefault Tree.scrollsHorizontallyAndVertically	boolean
+ * @uiDefault Tree.paintLines						boolean
+ * @uiDefault Tree.lineTypeDashed					boolean
+ * @uiDefault Tree.showsRootHandles					boolean
+ * @uiDefault Tree.repaintWholeRow					boolean
+ *
+ * <!-- DefaultTreeCellRenderer -->
+ *
+ * @uiDefault Tree.leafIcon							Icon
+ * @uiDefault Tree.closedIcon						Icon
+ * @uiDefault Tree.openIcon							Icon
+ * @uiDefault Tree.textBackground					Color
+ * @uiDefault Tree.textForeground					Color
+ * @uiDefault Tree.selectionBackground				Color
+ * @uiDefault Tree.selectionForeground				Color
+ * @uiDefault Tree.selectionBorderColor				Color	focus indicator border color
+ * @uiDefault Tree.drawsFocusBorderAroundIcon		boolean
+ * @uiDefault Tree.drawDashedFocusIndicator			boolean
+ * @uiDefault Tree.rendererFillBackground			boolean	default is true
+ * @uiDefault Tree.rendererMargins					Insets
+ * @uiDefault Tree.dropCellBackground				Color
+ * @uiDefault Tree.dropCellForeground				Color
+ *
+ * <!-- FlatTreeUI -->
  *
  * @uiDefault Tree.border							Border
  * @uiDefault Tree.selectionBackground				Color
  * @uiDefault Tree.selectionForeground				Color
  * @uiDefault Tree.selectionInactiveBackground		Color
  * @uiDefault Tree.selectionInactiveForeground		Color
+ * @uiDefault Tree.wideSelection					boolean
+ * @uiDefault Tree.showCellFocusIndicator			boolean
  *
  * @author Karl Tauber
  */
@@ -50,6 +94,9 @@ public class FlatTreeUI
 	protected Color selectionForeground;
 	protected Color selectionInactiveBackground;
 	protected Color selectionInactiveForeground;
+	protected Color selectionBorderColor;
+	protected boolean wideSelection;
+	protected boolean showCellFocusIndicator;
 
 	public static ComponentUI createUI( JComponent c ) {
 		return new FlatTreeUI();
@@ -65,6 +112,9 @@ public class FlatTreeUI
 		selectionForeground = UIManager.getColor( "Tree.selectionForeground" );
 		selectionInactiveBackground = UIManager.getColor( "Tree.selectionInactiveBackground" );
 		selectionInactiveForeground = UIManager.getColor( "Tree.selectionInactiveForeground" );
+		selectionBorderColor = UIManager.getColor( "Tree.selectionBorderColor" );
+		wideSelection = UIManager.getBoolean( "Tree.wideSelection" );
+		showCellFocusIndicator = UIManager.getBoolean( "Tree.showCellFocusIndicator" );
 
 		// scale
 		int rowHeight = FlatUIUtils.getUIInt( "Tree.rowHeight", 16 );
@@ -84,21 +134,115 @@ public class FlatTreeUI
 		selectionForeground = null;
 		selectionInactiveBackground = null;
 		selectionInactiveForeground = null;
+		selectionBorderColor = null;
+	}
+
+	@Override
+	protected MouseListener createMouseListener() {
+		if( !wideSelection )
+			return super.createMouseListener();
+
+		return new BasicTreeUI.MouseHandler() {
+			@Override
+			public void mousePressed( MouseEvent e ) {
+				super.mousePressed( handleWideMouseEvent( e ) );
+			}
+
+			@Override
+			public void mouseReleased( MouseEvent e ) {
+				super.mouseReleased( handleWideMouseEvent( e ) );
+			}
+
+			@Override
+			public void mouseDragged( MouseEvent e ) {
+				super.mouseDragged( handleWideMouseEvent( e ) );
+			}
+
+			private MouseEvent handleWideMouseEvent( MouseEvent e ) {
+				if( !tree.isEnabled() || !SwingUtilities.isLeftMouseButton( e ) || e.isConsumed() )
+					return e;
+
+				int x = e.getX();
+				int y = e.getY();
+				TreePath path = getClosestPathForLocation( tree, x, y );
+				if( path == null || isLocationInExpandControl( path, x, y ) )
+					return e;
+
+				Rectangle bounds = getPathBounds( tree, path );
+				if( bounds == null || y < bounds.y || y >= (bounds.y + bounds.height) )
+					return e;
+
+				int newX = Math.max( bounds.x, Math.min( x, bounds.x + bounds.width - 1 ) );
+				if( newX == x )
+					return e;
+
+				// clone mouse event, but with new X coordinate
+				return new MouseEvent( e.getComponent(), e.getID(), e.getWhen(),
+					e.getModifiers() | e.getModifiersEx(), newX, e.getY(),
+					e.getClickCount(), e.isPopupTrigger(), e.getButton() );
+			}
+		};
+	}
+
+	@Override
+	protected PropertyChangeListener createPropertyChangeListener() {
+		if( !wideSelection )
+			return super.createPropertyChangeListener();
+
+		return new BasicTreeUI.PropertyChangeHandler() {
+			@Override
+			public void propertyChange( PropertyChangeEvent e ) {
+				super.propertyChange( e );
+
+				if( e.getSource() == tree && e.getPropertyName() == "dropLocation" ) {
+					JTree.DropLocation oldValue = (JTree.DropLocation) e.getOldValue();
+					repaintWideDropLocation( oldValue );
+					repaintWideDropLocation( tree.getDropLocation() );
+				}
+			}
+
+			private void repaintWideDropLocation(JTree.DropLocation loc) {
+				if( loc == null || isDropLine( loc ) )
+					return;
+
+				Rectangle r = tree.getPathBounds( loc.getPath() );
+				if( r != null )
+					tree.repaint( 0, r.y, tree.getWidth(), r.height );
+			}
+		};
 	}
 
 	/**
-	 * Same as super.paintRow(), but uses inactive selection background/foreground if tree is not focused.
+	 * Same as super.paintRow(), but supports wide selection and uses
+	 * inactive selection background/foreground if tree is not focused.
 	 */
 	@Override
-	protected void paintRow( Graphics g, Rectangle clipBounds, Insets insets, Rectangle bounds, TreePath path, int row,
-		boolean isExpanded, boolean hasBeenExpanded, boolean isLeaf )
+	protected void paintRow( Graphics g, Rectangle clipBounds, Insets insets, Rectangle bounds,
+		TreePath path, int row, boolean isExpanded, boolean hasBeenExpanded, boolean isLeaf )
 	{
-		if( editingComponent != null && editingRow == row )
-			return;
-
+		boolean isEditing = (editingComponent != null && editingRow == row);
 		boolean hasFocus = tree.hasFocus();
 		boolean cellHasFocus = hasFocus && (row == getLeadSelectionRow());
 		boolean isSelected = tree.isRowSelected( row );
+		boolean isDropRow = isDropRow( row );
+
+		// wide selection background
+		if( wideSelection && (isSelected || isDropRow) ) {
+			// fill background
+			g.setColor( isDropRow
+				? UIManager.getColor( "Tree.dropCellBackground" )
+				: (hasFocus ? selectionBackground : selectionInactiveBackground) );
+			g.fillRect( 0, bounds.y, tree.getWidth(), bounds.height );
+
+			// paint expand/collapse icon
+			if( shouldPaintExpandControl( path, row, isExpanded, hasBeenExpanded, isLeaf ) ) {
+				paintExpandControl( g, clipBounds, insets, bounds,
+					path, row, isExpanded, hasBeenExpanded, isLeaf );
+			}
+		}
+
+		if( isEditing )
+			return;
 
 		// get renderer component
 		Component rendererComponent = currentCellRenderer.getTreeCellRendererComponent( tree,
@@ -106,7 +250,7 @@ public class FlatTreeUI
 
 		// apply inactive selection background/foreground if tree is not focused
 		Color oldBackgroundSelectionColor = null;
-		if( isSelected && !hasFocus ) {
+		if( isSelected && !hasFocus && !isDropRow ) {
 			if( rendererComponent instanceof DefaultTreeCellRenderer ) {
 				DefaultTreeCellRenderer renderer = (DefaultTreeCellRenderer) rendererComponent;
 				if( renderer.getBackgroundSelectionColor() == selectionBackground ) {
@@ -122,11 +266,43 @@ public class FlatTreeUI
 				rendererComponent.setForeground( selectionInactiveForeground );
 		}
 
+		// remove focus selection border if exactly one item is selected
+		Color oldBorderSelectionColor = null;
+		if( isSelected && hasFocus &&
+			(!showCellFocusIndicator || tree.getMinSelectionRow() == tree.getMaxSelectionRow()) &&
+			rendererComponent instanceof DefaultTreeCellRenderer )
+		{
+			DefaultTreeCellRenderer renderer = (DefaultTreeCellRenderer) rendererComponent;
+			if( renderer.getBorderSelectionColor() == selectionBorderColor ) {
+				oldBorderSelectionColor = renderer.getBorderSelectionColor();
+				renderer.setBorderSelectionColor( null );
+			}
+		}
+
 		// paint renderer
 		rendererPane.paintComponent( g, rendererComponent, tree, bounds.x, bounds.y, bounds.width, bounds.height, true );
 
-		// restore background selection color
+		// restore background selection color and border selection color
 		if( oldBackgroundSelectionColor != null )
 			((DefaultTreeCellRenderer)rendererComponent).setBackgroundSelectionColor( oldBackgroundSelectionColor );
+		if( oldBorderSelectionColor != null )
+			((DefaultTreeCellRenderer)rendererComponent).setBorderSelectionColor( oldBorderSelectionColor );
+	}
+
+	/**
+	 * Checks whether dropping on a row.
+	 * See DefaultTreeCellRenderer.getTreeCellRendererComponent().
+	 */
+	private boolean isDropRow( int row ) {
+		JTree.DropLocation dropLocation = tree.getDropLocation();
+		return dropLocation != null &&
+			dropLocation.getChildIndex() == -1 &&
+			tree.getRowForPath( dropLocation.getPath() ) == row;
+	}
+
+	@Override
+	protected Rectangle getDropLineRect( DropLocation loc ) {
+		Rectangle r = super.getDropLineRect( loc );
+		return wideSelection ? new Rectangle( 0, r.y, tree.getWidth(), r.height ) : r;
 	}
 }

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

@@ -17,13 +17,17 @@
 package com.formdev.flatlaf.ui;
 
 import java.awt.Color;
+import java.awt.Component;
 import java.awt.Container;
+import java.awt.Dimension;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
 import java.awt.Insets;
 import java.awt.Rectangle;
 import java.awt.RenderingHints;
 import java.awt.Shape;
+import java.awt.event.FocusEvent;
+import java.awt.event.FocusListener;
 import java.awt.event.MouseAdapter;
 import java.awt.event.MouseEvent;
 import java.awt.geom.Path2D;
@@ -31,8 +35,12 @@ import java.awt.geom.Rectangle2D;
 import java.awt.geom.RoundRectangle2D;
 import java.util.function.Consumer;
 import javax.swing.JComponent;
+import javax.swing.LookAndFeel;
 import javax.swing.UIManager;
 import javax.swing.plaf.ColorUIResource;
+import com.formdev.flatlaf.FlatClientProperties;
+import com.formdev.flatlaf.util.DerivedColor;
+import com.formdev.flatlaf.util.HiDPIUtils;
 import com.formdev.flatlaf.util.JavaCompatibility;
 import com.formdev.flatlaf.util.UIScale;
 
@@ -61,6 +69,20 @@ public class FlatUIUtils
 			r.height - insets.top - insets.bottom );
 	}
 
+	public static Dimension addInsets( Dimension dim, Insets insets ) {
+		return new Dimension(
+			dim.width + insets.left + insets.right,
+			dim.height + insets.top + insets.bottom );
+	}
+
+	public static Insets addInsets( Insets insets1, Insets insets2 ) {
+		return new Insets(
+			insets1.top + insets2.top,
+			insets1.left + insets2.left,
+			insets1.bottom + insets2.bottom,
+			insets1.right + insets2.right );
+	}
+
 	public static Color getUIColor( String key, int defaultColorRGB ) {
 		Color color = UIManager.getColor( key );
 		return (color != null) ? color : new Color( defaultColorRGB );
@@ -71,15 +93,34 @@ public class FlatUIUtils
 		return (color != null) ? color : defaultColor;
 	}
 
+	public static Color getUIColor( String key, String defaultKey ) {
+		Color color = UIManager.getColor( key );
+		return (color != null) ? color : UIManager.getColor( defaultKey );
+	}
+
 	public static int getUIInt( String key, int defaultValue ) {
 		Object value = UIManager.get( key );
 		return (value instanceof Integer) ? (Integer) value : defaultValue;
 	}
 
+	public static float getUIFloat( String key, float defaultValue ) {
+		Object value = UIManager.get( key );
+		return (value instanceof Number) ? ((Number)value).floatValue() : defaultValue;
+	}
+
 	public static Color nonUIResource( Color c ) {
 		return (c instanceof ColorUIResource) ? new Color( c.getRGB(), true ) : c;
 	}
 
+	public static int minimumWidth( JComponent c, int minimumWidth ) {
+		Object p = c.getClientProperty( FlatClientProperties.MINIMUM_WIDTH );
+		return (p instanceof Integer) ? ((Integer)p).intValue() : minimumWidth;
+	}
+
+	public static boolean isTableCellEditor( Component c ) {
+		return c instanceof JComponent && Boolean.TRUE.equals( ((JComponent)c).getClientProperty( "JComboBox.isTableCellEditor" ) );
+	}
+
 	/**
 	 * Sets rendering hints used for painting.
 	 */
@@ -89,10 +130,80 @@ public class FlatUIUtils
 			MAC_USE_QUARTZ ? RenderingHints.VALUE_STROKE_PURE : RenderingHints.VALUE_STROKE_NORMALIZE );
 	}
 
+	public static void setColor( Graphics g, Color color, Color baseColor ) {
+		if( color instanceof DerivedColor )
+			color = ((DerivedColor)color).derive( baseColor );
+		g.setColor( color );
+	}
+
 	/**
-	 * Draws a round rectangle.
+	 * Paints an outer border, which is usually a focus border.
+	 * <p>
+	 * The outside bounds of the painted border are {@code x,y,width,height}.
+	 * The line width of the painted border is {@code focusWidth + lineWidth}.
+	 * The given arc diameter refers to the inner rectangle ({@code x,y,width,height} minus {@code focusWidth}).
+	 *
+	 * @see #paintComponentBorder
+	 * @see #paintComponentBackground
 	 */
-	public static void drawRoundRectangle( Graphics2D g, int x, int y, int width, int height,
+	public static void paintComponentOuterBorder( Graphics2D g, int x, int y, int width, int height,
+		float focusWidth, float lineWidth, float arc )
+	{
+		double systemScaleFactor = UIScale.getSystemScaleFactor( 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( g, x, y, width, height, systemScaleFactor,
+				(g2d, x2, y2, width2, height2, scaleFactor) -> {
+					paintComponentOuterBorderImpl( g2d, x2, y2, width2, height2,
+						(float) (focusWidth * scaleFactor), (float) (lineWidth * scaleFactor), (float) (arc * scaleFactor) );
+				} );
+			return;
+		}
+
+		paintComponentOuterBorderImpl( g, x, y, width, height, focusWidth, lineWidth, arc );
+	}
+
+	private static void paintComponentOuterBorderImpl( Graphics2D g, int x, int y, int width, int height,
+		float focusWidth, float lineWidth, float arc )
+	{
+		float outerRadius = (arc > 0) ? arc + focusWidth - UIScale.scale( 2f ) : focusWidth;
+		float ow = focusWidth + lineWidth;
+		float innerRadius = outerRadius - ow;
+
+		Path2D path = new Path2D.Float( Path2D.WIND_EVEN_ODD );
+		path.append( createRoundRectanglePath( x, y, width, height, outerRadius, outerRadius, outerRadius, outerRadius ), false );
+		path.append( createRoundRectanglePath( x + ow, y + ow, width - (ow * 2), height - (ow * 2), innerRadius, innerRadius, innerRadius, innerRadius ), false );
+		g.fill( path );
+	}
+
+	/**
+	 * Draws the border of a component as round rectangle.
+	 * <p>
+	 * The outside bounds of the painted border are
+	 * {@code x + focusWidth, y + focusWidth, width - (focusWidth * 2), height - (focusWidth * 2)}.
+	 * The given arc diameter refers to the painted rectangle (and not to {@code x,y,width,height}).
+	 *
+	 * @see #paintComponentOuterBorder
+	 * @see #paintComponentBackground
+	 */
+	public static void paintComponentBorder( Graphics2D g, int x, int y, int width, int height,
+		float focusWidth, float lineWidth, float arc )
+	{
+		double systemScaleFactor = UIScale.getSystemScaleFactor( 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( g, x, y, width, height, systemScaleFactor,
+				(g2d, x2, y2, width2, height2, scaleFactor) -> {
+					paintComponentBorderImpl( g2d, x2, y2, width2, height2,
+						(float) (focusWidth * scaleFactor), (float) (lineWidth * scaleFactor), (float) (arc * scaleFactor) );
+				} );
+			return;
+		}
+
+		paintComponentBorderImpl( g, x, y, width, height, focusWidth, lineWidth, arc );
+	}
+
+	private static void paintComponentBorderImpl( Graphics2D g, int x, int y, int width, int height,
 		float focusWidth, float lineWidth, float arc )
 	{
 		float arc2 = arc > lineWidth ? arc - lineWidth : 0f;
@@ -111,9 +222,33 @@ public class FlatUIUtils
 	}
 
 	/**
-	 * Fills a round rectangle.
+	 * Fills the background of a component with a round rectangle.
+	 * <p>
+	 * The bounds of the painted round rectangle are
+	 * {@code x + focusWidth, y + focusWidth, width - (focusWidth * 2), height - (focusWidth * 2)}.
+	 * The given arc diameter refers to the painted rectangle (and not to {@code x,y,width,height}).
+	 *
+	 * @see #paintComponentOuterBorder
+	 * @see #paintComponentBorder
 	 */
-	public static void fillRoundRectangle( Graphics2D g, int x, int y, int width, int height,
+	public static void paintComponentBackground( Graphics2D g, int x, int y, int width, int height,
+		float focusWidth, float arc )
+	{
+		double systemScaleFactor = UIScale.getSystemScaleFactor( 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( g, x, y, width, height, systemScaleFactor,
+				(g2d, x2, y2, width2, height2, scaleFactor) -> {
+					paintComponentBackgroundImpl( g2d, x2, y2, width2, height2,
+						(float) (focusWidth * scaleFactor), (float) (arc * scaleFactor) );
+				} );
+			return;
+		}
+
+		paintComponentBackgroundImpl( g, x, y, width, height, focusWidth, arc );
+	}
+
+	private static void paintComponentBackgroundImpl( Graphics2D g, int x, int y, int width, int height,
 		float focusWidth, float arc )
 	{
 		g.fill( new RoundRectangle2D.Float(
@@ -133,6 +268,16 @@ public class FlatUIUtils
 		}
 	}
 
+	/**
+	 * Gets the background color of the first opaque parent.
+	 */
+	public static Color getParentBackground( JComponent c ) {
+		Container parent = findOpaqueParent( c );
+		return (parent != null)
+			? parent.getBackground()
+			: UIManager.getColor( "Panel.background" ); // fallback, probably never used
+	}
+
 	/**
 	 * Find the first parent that is opaque.
 	 */
@@ -145,45 +290,74 @@ public class FlatUIUtils
 	}
 
 	/**
-	 * Paints an outline border.
+	 * Creates a not-filled rectangle shape with the given line width.
 	 */
-	public static void paintOutlineBorder( Graphics2D g, int x, int y, int width, int height,
-		float focusWidth, float lineWidth, float arc )
-	{
-		float outerArc = (arc > 0) ? arc + focusWidth - UIScale.scale( 2f ) : focusWidth;
-		float ow = focusWidth + lineWidth;
-
+	public static Path2D createRectangle( float x, float y, float width, float height, float lineWidth ) {
 		Path2D path = new Path2D.Float( Path2D.WIND_EVEN_ODD );
-		path.append( createOutlinePath( x, y, width, height, outerArc ), false );
-		path.append( createOutlinePath( x + ow, y + ow, width - (ow * 2), height - (ow * 2), outerArc - ow ), false );
-		g.fill( path );
+		path.append( new Rectangle2D.Float( x, y, width, height ), false );
+		path.append( new Rectangle2D.Float( x + lineWidth, y + lineWidth,
+			width - (lineWidth * 2), height - (lineWidth * 2) ), false );
+		return path;
 	}
 
-	private static Shape createOutlinePath( float x, float y, float width, float height, float arc ) {
-		if( arc <= 0 )
+	/**
+	 * Creates a not-filled rounded rectangle shape and allows specifying the line width and the radius or each corner.
+	 */
+	public static Path2D createRoundRectangle( float x, float y, float width, float height,
+		float lineWidth, float arcTopLeft, float arcTopRight, float arcBottomLeft, float arcBottomRight )
+	{
+		Path2D path = new Path2D.Float( Path2D.WIND_EVEN_ODD );
+		path.append( createRoundRectanglePath( x, y, width, height, arcTopLeft, arcTopRight, arcBottomLeft, arcBottomRight ), false );
+		path.append( createRoundRectanglePath( x + lineWidth, y + lineWidth, width - (lineWidth * 2), height - (lineWidth * 2),
+			arcTopLeft - lineWidth, arcTopRight - lineWidth, arcBottomLeft - lineWidth, arcBottomRight - lineWidth ), false );
+		return path;
+	}
+
+	/**
+	 * Creates a filled rounded rectangle shape and allows specifying the radius of each corner.
+	 */
+	public static Shape createRoundRectanglePath( float x, float y, float width, float height,
+		float arcTopLeft, float arcTopRight, float arcBottomLeft, float arcBottomRight )
+	{
+		if( arcTopLeft <= 0 && arcTopRight <= 0 && arcBottomLeft <= 0 && arcBottomRight <= 0 )
 			return new Rectangle2D.Float( x, y, width, height );
 
+		if( arcTopLeft < 0 )
+			arcTopLeft = 0;
+		if( arcTopRight < 0 )
+			arcTopRight = 0;
+		if( arcBottomLeft < 0 )
+			arcBottomLeft = 0;
+		if( arcBottomRight < 0 )
+			arcBottomRight = 0;
+
 		float x2 = x + width;
 		float y2 = y + height;
 
 		Path2D rect = new Path2D.Float();
-		rect.moveTo( x2 - arc, y );
-		rect.quadTo( x2, y, x2, y + arc );
-		rect.lineTo( x2, y2 - arc );
-		rect.quadTo( x2, y2, x2 - arc, y2 );
-		rect.lineTo( x + arc, y2 );
-		rect.quadTo( x, y2, x, y2 - arc );
-		rect.lineTo( x, y + arc );
-		rect.quadTo( x, y, x + arc, y );
+		rect.moveTo( x2 - arcTopRight, y );
+		rect.quadTo( x2, y, x2, y + arcTopRight );
+		rect.lineTo( x2, y2 - arcBottomRight );
+		rect.quadTo( x2, y2, x2 - arcBottomRight, y2 );
+		rect.lineTo( x + arcBottomLeft, y2 );
+		rect.quadTo( x, y2, x, y2 - arcBottomLeft );
+		rect.lineTo( x, y + arcTopLeft );
+		rect.quadTo( x, y, x + arcTopLeft, y );
 		rect.closePath();
 
 		return rect;
 	}
 
+	/**
+	 * Creates a closed path for the given points.
+	 */
 	public static Path2D createPath( double... points ) {
 		return createPath( true, points );
 	}
 
+	/**
+	 * Creates a open or closed path for the given points.
+	 */
 	public static Path2D createPath( boolean close, double... points ) {
 		Path2D path = new Path2D.Float();
 		path.moveTo( points[0], points[1] );
@@ -195,6 +369,22 @@ public class FlatUIUtils
 	}
 
 	/**
+	 * Draws the given string at the specified location using text properties
+	 * and anti-aliasing hints from the provided component.
+	 *
+	 * Use this method instead of Graphics.drawString() for correct anti-aliasing.
+	 *
+	 * Replacement for SwingUtilities2.drawString()
+	 */
+	public static void drawString( JComponent c, Graphics g, String text, int x, int y ) {
+		JavaCompatibility.drawStringUnderlineCharAt( c, g, text, -1, x, y );
+	}
+
+	/**
+	 * Draws the given string at the specified location underlining the specified
+	 * character. The provided component is used to query text properties and
+	 * anti-aliasing hints.
+	 *
 	 * Replacement for SwingUtilities2.drawStringUnderlineCharAt()
 	 */
 	public static void drawStringUnderlineCharAt( JComponent c, Graphics g,
@@ -203,15 +393,23 @@ public class FlatUIUtils
 		JavaCompatibility.drawStringUnderlineCharAt( c, g, text, underlinedIndex, x, y );
 	}
 
+	public static boolean hasOpaqueBeenExplicitlySet( JComponent c ) {
+		boolean oldOpaque = c.isOpaque();
+		LookAndFeel.installProperty( c, "opaque", !oldOpaque );
+		boolean explicitlySet = c.isOpaque() == oldOpaque;
+		LookAndFeel.installProperty( c, "opaque", oldOpaque );
+		return explicitlySet;
+	}
+
 	//---- class HoverListener ------------------------------------------------
 
 	public static class HoverListener
 		extends MouseAdapter
 	{
-		private final JComponent repaintComponent;
+		private final Component repaintComponent;
 		private final Consumer<Boolean> hoverChanged;
 
-		public HoverListener( JComponent repaintComponent, Consumer<Boolean> hoverChanged ) {
+		public HoverListener( Component repaintComponent, Consumer<Boolean> hoverChanged ) {
 			this.repaintComponent = repaintComponent;
 			this.hoverChanged = hoverChanged;
 		}
@@ -233,4 +431,26 @@ public class FlatUIUtils
 				repaintComponent.repaint();
 		}
 	}
+
+	//---- class RepaintFocusListener -----------------------------------------
+
+	public static class RepaintFocusListener
+		implements FocusListener
+	{
+		private final Component repaintComponent;
+
+		public RepaintFocusListener( Component repaintComponent ) {
+			this.repaintComponent = repaintComponent;
+		}
+
+		@Override
+		public void focusGained( FocusEvent e ) {
+			repaintComponent.repaint();
+		}
+
+		@Override
+		public void focusLost( FocusEvent e ) {
+			repaintComponent.repaint();
+		}
+	}
 }

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

@@ -27,6 +27,12 @@ import javax.swing.plaf.basic.BasicViewportUI;
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JViewport}.
  *
+ * <!-- BasicViewportUI -->
+ *
+ * @uiDefault Viewport.font					Font	unused
+ * @uiDefault Viewport.background			Color
+ * @uiDefault Viewport.foreground			Color	unused
+ *
  * @author Karl Tauber
  */
 public class FlatViewportUI

flatlaf-core/src/main/java/com/formdev/flatlaf/util/ColorFunctions.java

@@ -0,0 +1,102 @@
+/*
+ * Copyright 2019 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
+ *
+ *     http://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.util;
+
+import java.awt.Color;
+
+/**
+ * Functions that modify colors.
+ *
+ * @author Karl Tauber
+ */
+public class ColorFunctions
+{
+	public static Color applyFunctions( Color color, ColorFunction... functions ) {
+		float[] hsl = HSLColor.fromRGB( color );
+		float alpha = color.getAlpha() / 255f;
+
+		for( ColorFunction function : functions )
+			function.apply( hsl );
+
+		return HSLColor.toRGB( hsl, alpha );
+	}
+
+	private static float clamp( float value ) {
+		return (value < 0)
+			? 0
+			: ((value > 100)
+				? 100
+				: value);
+	}
+
+	//---- interface ColorFunction --------------------------------------------
+
+	public interface ColorFunction {
+		void apply( float[] hsl );
+	}
+
+	//---- class Lighten ------------------------------------------------------
+
+	/**
+	 * Increase the lightness of a color in the HSL color space by an absolute
+	 * or relative amount.
+	 */
+	public static class Lighten
+		implements ColorFunction
+	{
+		private final float amount;
+		private final boolean relative;
+		private final boolean autoInverse;
+
+		public Lighten( float amount, boolean relative, boolean autoInverse ) {
+			this.amount = amount;
+			this.relative = relative;
+			this.autoInverse = autoInverse;
+		}
+
+		@Override
+		public void apply( float[] hsl ) {
+			float amount2 = autoInverse && shouldInverse( hsl ) ? -amount : amount;
+			hsl[2] = clamp( relative
+				? (hsl[2] * ((100 + amount2) / 100))
+				: (hsl[2] + amount2) );
+		}
+
+		protected boolean shouldInverse( float[] hsl ) {
+			return hsl[2] >= 50;
+		}
+	}
+
+	//---- class Darken -------------------------------------------------------
+
+	/**
+	 * Decrease the lightness of a color in the HSL color space by an absolute
+	 * or relative amount.
+	 */
+	public static class Darken
+		extends Lighten
+	{
+		public Darken( float amount, boolean relative, boolean autoInverse ) {
+			super( -amount, relative, autoInverse );
+		}
+
+		@Override
+		protected boolean shouldInverse( float[] hsl ) {
+			return hsl[2] < 50;
+		}
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/util/DerivedColor.java

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2019 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
+ *
+ *     http://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.util;
+
+import java.awt.Color;
+import javax.swing.plaf.ColorUIResource;
+import com.formdev.flatlaf.util.ColorFunctions.ColorFunction;
+
+/**
+ * A (red) color that acts as a placeholder in UI defaults.
+ * The actual color is derived from another color,
+ * which is modified by the given color functions.
+ *
+ * @author Karl Tauber
+ */
+public class DerivedColor
+	extends ColorUIResource
+{
+	private final ColorFunction[] functions;
+
+	public DerivedColor( ColorFunction... functions ) {
+		super( Color.red );
+		this.functions = functions;
+	}
+
+	public Color derive( Color baseColor ) {
+		return ColorFunctions.applyFunctions( baseColor, functions );
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/util/HSLColor.java

@@ -0,0 +1,432 @@
+/*
+ * From http://tips4java.wordpress.com/2009/07/05/hsl-color/
+ *
+ * License note on http://tips4java.wordpress.com/about/
+ *   "You are free to use and/or modify any or all code posted on the
+ *    Java Tips Weblog without restriction. A credit in the code comments
+ *    would be nice, but not in any way mandatory."
+ */
+
+package com.formdev.flatlaf.util;
+
+import java.awt.Color;
+
+/**
+ *  The HSLColor class provides methods to manipulate HSL (Hue, Saturation
+ *  Luminance) values to create a corresponding Color object using the RGB
+ *  ColorSpace.
+ *
+ *  The HUE is the color, the Saturation is the purity of the color (with
+ *  respect to grey) and Luminance is the brightness of the color (with respect
+ *  to black and white)
+ *
+ *  The Hue is specified as an angel between 0 - 360 degrees where red is 0,
+ *  green is 120 and blue is 240. In between you have the colors of the rainbow.
+ *  Saturation is specified as a percentage between 0 - 100 where 100 is fully
+ *  saturated and 0 approaches gray. Luminance is specified as a percentage
+ *  between 0 - 100 where 0 is black and 100 is white.
+ *
+ *  In particular the HSL color space makes it easier change the Tone or Shade
+ *  of a color by adjusting the luminance value.
+ */
+public class HSLColor
+{
+	private final Color rgb;
+	private final float[] hsl;
+	private final float alpha;
+
+	/**
+	 *  Create a HSLColor object using an RGB Color object.
+	 *
+	 *  @param rgb the RGB Color object
+	 */
+	public HSLColor(Color rgb)
+	{
+		this.rgb = rgb;
+		hsl = fromRGB( rgb );
+		alpha = rgb.getAlpha() / 255.0f;
+	}
+
+	/**
+	 *  Create a HSLColor object using individual HSL values and a default
+	 * alpha value of 1.0.
+	 *
+	 *  @param h is the Hue value in degrees between 0 - 360
+	 *  @param s is the Saturation percentage between 0 - 100
+	 *  @param l is the Lumanance percentage between 0 - 100
+	 */
+	public HSLColor(float h, float s, float l)
+	{
+		this(h, s, l, 1.0f);
+	}
+
+	/**
+	 *  Create a HSLColor object using individual HSL values.
+	 *
+	 *  @param h     the Hue value in degrees between 0 - 360
+	 *  @param s     the Saturation percentage between 0 - 100
+	 *  @param l     the Lumanance percentage between 0 - 100
+	 *  @param alpha the alpha value between 0 - 1
+	 */
+	public HSLColor(float h, float s, float l, float alpha)
+	{
+		hsl = new float[] {h, s, l};
+		this.alpha = alpha;
+		rgb = toRGB(hsl, alpha);
+	}
+
+	/**
+	 *  Create a HSLColor object using an an array containing the
+	 *  individual HSL values and with a default alpha value of 1.
+	 *
+	 *  @param hsl  array containing HSL values
+	 */
+	public HSLColor(float[] hsl)
+	{
+		this(hsl, 1.0f);
+	}
+
+	/**
+	 *  Create a HSLColor object using an an array containing the
+	 *  individual HSL values.
+	 *
+	 *  @param hsl  array containing HSL values
+	 *  @param alpha the alpha value between 0 - 1
+	 */
+	public HSLColor(float[] hsl, float alpha)
+	{
+		this.hsl = hsl;
+		this.alpha = alpha;
+		rgb = toRGB(hsl, alpha);
+	}
+
+	/**
+	 *  Create a RGB Color object based on this HSLColor with a different
+	 *  Hue value. The degrees specified is an absolute value.
+	 *
+	 *  @param degrees - the Hue value between 0 - 360
+	 *  @return the RGB Color object
+	 */
+	public Color adjustHue(float degrees)
+	{
+		return toRGB(degrees, hsl[1], hsl[2], alpha);
+	}
+
+	/**
+	 *  Create a RGB Color object based on this HSLColor with a different
+	 *  Luminance value. The percent specified is an absolute value.
+	 *
+	 *  @param percent - the Luminance value between 0 - 100
+	 *  @return the RGB Color object
+	 */
+	public Color adjustLuminance(float percent)
+	{
+		return toRGB(hsl[0], hsl[1], percent, alpha);
+	}
+
+	/**
+	 *  Create a RGB Color object based on this HSLColor with a different
+	 *  Saturation value. The percent specified is an absolute value.
+	 *
+	 *  @param percent - the Saturation value between 0 - 100
+	 *  @return the RGB Color object
+	 */
+	public Color adjustSaturation(float percent)
+	{
+		return toRGB(hsl[0], percent, hsl[2], alpha);
+	}
+
+	/**
+	 *  Create a RGB Color object based on this HSLColor with a different
+	 *  Shade. Changing the shade will return a darker color. The percent
+	 *  specified is a relative value.
+	 *
+	 *  @param percent - the value between 0 - 100
+	 *  @return the RGB Color object
+	 */
+	public Color adjustShade(float percent)
+	{
+		float multiplier = (100.0f - percent) / 100.0f;
+		float l = Math.max(0.0f, hsl[2] * multiplier);
+
+		return toRGB(hsl[0], hsl[1], l, alpha);
+	}
+
+	/**
+	 *  Create a RGB Color object based on this HSLColor with a different
+	 *  Tone. Changing the tone will return a lighter color. The percent
+	 *  specified is a relative value.
+	 *
+	 *  @param percent - the value between 0 - 100
+	 *  @return the RGB Color object
+	 */
+	public Color adjustTone(float percent)
+	{
+		float multiplier = (100.0f + percent) / 100.0f;
+		float l = Math.min(100.0f, hsl[2] * multiplier);
+
+		return toRGB(hsl[0], hsl[1], l, alpha);
+	}
+
+	/**
+	 *  Get the Alpha value.
+	 *
+	 *  @return the Alpha value.
+	 */
+	public float getAlpha()
+	{
+		return alpha;
+	}
+
+	/**
+	 *  Create a RGB Color object that is the complementary color of this
+	 *  HSLColor. This is a convenience method. The complementary color is
+	 *  determined by adding 180 degrees to the Hue value.
+	 *  @return the RGB Color object
+	 */
+	public Color getComplementary()
+	{
+		float hue = (hsl[0] + 180.0f) % 360.0f;
+		return toRGB(hue, hsl[1], hsl[2]);
+	}
+
+	/**
+	 *  Get the Hue value.
+	 *
+	 *  @return the Hue value.
+	 */
+	public float getHue()
+	{
+		return hsl[0];
+	}
+
+	/**
+	 *  Get the HSL values.
+	 *
+	 *  @return the HSL values.
+	 */
+	public float[] getHSL()
+	{
+		return hsl;
+	}
+
+	/**
+	 *  Get the Luminance value.
+	 *
+	 *  @return the Luminance value.
+	 */
+	public float getLuminance()
+	{
+		return hsl[2];
+	}
+
+	/**
+	 *  Get the RGB Color object represented by this HDLColor.
+	 *
+	 *  @return the RGB Color object.
+	 */
+	public Color getRGB()
+	{
+		return rgb;
+	}
+
+	/**
+	 *  Get the Saturation value.
+	 *
+	 *  @return the Saturation value.
+	 */
+	public float getSaturation()
+	{
+		return hsl[1];
+	}
+
+	@Override
+	public String toString()
+	{
+		String toString =
+			"HSLColor[h=" + hsl[0] +
+			",s=" + hsl[1] +
+			",l=" + hsl[2] +
+			",alpha=" + alpha + "]";
+
+		return toString;
+	}
+
+	/**
+	 *  Convert a RGB Color to it corresponding HSL values.
+	 *
+	 *  @return an array containing the 3 HSL values.
+	 */
+	public static float[] fromRGB(Color color)
+	{
+		//  Get RGB values in the range 0 - 1
+
+		float[] rgb = color.getRGBColorComponents( null );
+		float r = rgb[0];
+		float g = rgb[1];
+		float b = rgb[2];
+
+		//	Minimum and Maximum RGB values are used in the HSL calculations
+
+		float min = Math.min(r, Math.min(g, b));
+		float max = Math.max(r, Math.max(g, b));
+
+		//  Calculate the Hue
+
+		float h = 0;
+
+		if (max == min)
+			h = 0;
+		else if (max == r)
+			h = ((60 * (g - b) / (max - min)) + 360) % 360;
+		else if (max == g)
+			h = (60 * (b - r) / (max - min)) + 120;
+		else if (max == b)
+			h = (60 * (r - g) / (max - min)) + 240;
+
+		//  Calculate the Luminance
+
+		float l = (max + min) / 2;
+//		System.out.println(max + " : " + min + " : " + l);
+
+		//  Calculate the Saturation
+
+		float s = 0;
+
+		if (max == min)
+			s = 0;
+		else if (l <= .5f)
+			s = (max - min) / (max + min);
+		else
+			s = (max - min) / (2 - max - min);
+
+//		System.out.println(new HSLColor( new float[] {h, s * 100, l * 100} ));
+		return new float[] {h, s * 100, l * 100};
+	}
+
+	/**
+	 *  Convert HSL values to a RGB Color with a default alpha value of 1.
+	 *  H (Hue) is specified as degrees in the range 0 - 360.
+	 *  S (Saturation) is specified as a percentage in the range 1 - 100.
+	 *  L (Lumanance) is specified as a percentage in the range 1 - 100.
+	 *
+	 *  @param hsl an array containing the 3 HSL values
+	 *
+	 *  @return the RGB Color object
+	 */
+	public static Color toRGB(float[] hsl)
+	{
+		return toRGB(hsl, 1.0f);
+	}
+
+	/**
+	 *  Convert HSL values to a RGB Color.
+	 *  H (Hue) is specified as degrees in the range 0 - 360.
+	 *  S (Saturation) is specified as a percentage in the range 1 - 100.
+	 *  L (Lumanance) is specified as a percentage in the range 1 - 100.
+	 *
+	 *  @param hsl    an array containing the 3 HSL values
+	 *  @param alpha  the alpha value between 0 - 1
+	 *
+	 *  @return the RGB Color object
+	 */
+	public static Color toRGB(float[] hsl, float alpha)
+	{
+		return toRGB(hsl[0], hsl[1], hsl[2], alpha);
+	}
+
+	/**
+	 *  Convert HSL values to a RGB Color with a default alpha value of 1.
+	 *
+	 *  @param h Hue is specified as degrees in the range 0 - 360.
+	 *  @param s Saturation is specified as a percentage in the range 1 - 100.
+	 *  @param l Lumanance is specified as a percentage in the range 1 - 100.
+	 *
+	 *  @return the RGB Color object
+	 */
+	public static Color toRGB(float h, float s, float l)
+	{
+		return toRGB(h, s, l, 1.0f);
+	}
+
+	/**
+	 *  Convert HSL values to a RGB Color.
+	 *
+	 *  @param h Hue is specified as degrees in the range 0 - 360.
+	 *  @param s Saturation is specified as a percentage in the range 1 - 100.
+	 *  @param l Lumanance is specified as a percentage in the range 1 - 100.
+	 *  @param alpha  the alpha value between 0 - 1
+	 *
+	 *  @return the RGB Color object
+	 */
+	public static Color toRGB(float h, float s, float l, float alpha)
+	{
+		if (s <0.0f || s > 100.0f)
+		{
+			String message = "Color parameter outside of expected range - Saturation";
+			throw new IllegalArgumentException( message );
+		}
+
+		if (l <0.0f || l > 100.0f)
+		{
+			String message = "Color parameter outside of expected range - Luminance";
+			throw new IllegalArgumentException( message );
+		}
+
+		if (alpha <0.0f || alpha > 1.0f)
+		{
+			String message = "Color parameter outside of expected range - Alpha";
+			throw new IllegalArgumentException( message );
+		}
+
+		//  Formula needs all values between 0 - 1.
+
+		h = h % 360.0f;
+		h /= 360f;
+		s /= 100f;
+		l /= 100f;
+
+		float q = 0;
+
+		if (l < 0.5)
+			q = l * (1 + s);
+		else
+			q = (l + s) - (s * l);
+
+		float p = 2 * l - q;
+
+		float r = Math.max(0, HueToRGB(p, q, h + (1.0f / 3.0f)));
+		float g = Math.max(0, HueToRGB(p, q, h));
+		float b = Math.max(0, HueToRGB(p, q, h - (1.0f / 3.0f)));
+
+		r = Math.min(r, 1.0f);
+		g = Math.min(g, 1.0f);
+		b = Math.min(b, 1.0f);
+
+		return new Color(r, g, b, alpha);
+	}
+
+	private static float HueToRGB(float p, float q, float h)
+	{
+		if (h < 0) h += 1;
+
+		if (h > 1 ) h -= 1;
+
+		if (6 * h < 1)
+		{
+			return p + ((q - p) * 6 * h);
+		}
+
+		if (2 * h < 1 )
+		{
+			return  q;
+		}
+
+		if (3 * h < 2)
+		{
+			return p + ( (q - p) * 6 * ((2.0f / 3.0f) - h) );
+		}
+
+   		return p;
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/util/HiDPIUtils.java

@@ -0,0 +1,111 @@
+/*
+ * Copyright 2019 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
+ *
+ *     http://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.util;
+
+import java.awt.Graphics2D;
+import java.awt.geom.AffineTransform;
+import java.awt.geom.Rectangle2D;
+import javax.swing.JComponent;
+
+/**
+ * @author Karl Tauber
+ */
+public class HiDPIUtils
+{
+	public interface Painter {
+		public void paint( Graphics2D g, int x, int y, int width, int height, double scaleFactor );
+	}
+
+	public static void paintAtScale1x( Graphics2D g, JComponent c, Painter painter ) {
+		paintAtScale1x( g, 0, 0, c.getWidth(), c.getHeight(), painter );
+	}
+
+	public static void paintAtScale1x( Graphics2D g, int x, int y, int width, int height, Painter painter ) {
+		paintAtScale1x( g, x, y, width, height, UIScale.getSystemScaleFactor( g ), painter );
+	}
+
+	/**
+	 * Paint at system scale factor 1x to avoid rounding issues at 125%, 150% and 175% scaling.
+	 * <p>
+	 * Scales the given Graphics2D down to 100% and invokes the
+	 * given painter passing scaled x, y, width and height.
+	 * <p>
+	 * Uses the same scaling calculation as the JRE uses.
+	 */
+	public static void paintAtScale1x( Graphics2D g, int x, int y, int width, int height,
+		double scaleFactor, Painter painter )
+	{
+		if( scaleFactor == 1 ) {
+			painter.paint( g, x, y, width, height, 1 );
+			return;
+		}
+
+		// save original transform
+		AffineTransform transform = g.getTransform();
+
+		// scale rectangle
+		Rectangle2D.Double scaledRect = scale( transform, x, y, width, height );
+
+		try {
+			// unscale to factor 1.0
+			double scale = 1.0 / scaleFactor;
+			g.scale( scale, scale );
+
+			// compute origin delta x/y
+			double dx = Math.floor( scaledRect.x ) - transform.getTranslateX();
+			double dy = Math.floor( scaledRect.y ) - transform.getTranslateY();
+
+			// move origin to make sure that origin x/y are at whole numbers
+			if( dx != 0 || dy != 0 )
+				g.translate( dx, dy );
+
+			int swidth = (int) scaledRect.width;
+			int sheight = (int) scaledRect.height;
+
+			// paint
+			painter.paint( g, 0, 0, swidth, sheight, scaleFactor );
+		} finally {
+			// restore original transform
+			g.setTransform( transform );
+		}
+	}
+
+	/**
+	 * Scales a rectangle in the same way as the JRE does in
+	 * sun.java2d.pipe.PixelToParallelogramConverter.fillRectangle(),
+	 * which is used by Graphics.fillRect().
+	 */
+	private static Rectangle2D.Double scale( AffineTransform transform, int x, int y, int width, int height ) {
+		double dx1 = transform.getScaleX();
+		double dy2 = transform.getScaleY();
+		double px = x * dx1 + transform.getTranslateX();
+		double py = y * dy2 + transform.getTranslateY();
+		dx1 *= width;
+		dy2 *= height;
+
+		double newx = normalize( px );
+		double newy = normalize( py );
+		dx1 = normalize( px + dx1 ) - newx;
+		dy2 = normalize( py + dy2 ) - newy;
+
+		return new Rectangle2D.Double( newx, newy, dx1, dy2 );
+	}
+
+	private static double normalize( double value ) {
+		return Math.floor( value + 0.25 ) + 0.25;
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/util/JavaCompatibility.java

@@ -20,7 +20,10 @@ import java.awt.Graphics;
 import java.awt.Graphics2D;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 import javax.swing.JComponent;
+import com.formdev.flatlaf.FlatLaf;
 
 /**
  * Provides Java version compatibility methods.
@@ -52,7 +55,7 @@ public class JavaCompatibility
 						? new Class[] { JComponent.class, Graphics2D.class, String.class, int.class, float.class, float.class }
 						: new Class[] { JComponent.class, Graphics.class, String.class, int.class, int.class, int.class } );
 				} catch( Exception ex ) {
-					ex.printStackTrace();
+					Logger.getLogger( FlatLaf.class.getName() ).log( Level.SEVERE, null, ex );
 					throw new RuntimeException( ex );
 				}
 			}
@@ -64,7 +67,7 @@ public class JavaCompatibility
 			else
 				drawStringUnderlineCharAtMethod.invoke( null, c, g, text, underlinedIndex, x, y );
 		} catch( IllegalAccessException | IllegalArgumentException | InvocationTargetException ex ) {
-			ex.printStackTrace();
+			Logger.getLogger( FlatLaf.class.getName() ).log( Level.SEVERE, null, ex );
 			throw new RuntimeException( ex );
 		}
 	}

flatlaf-core/src/main/java/com/formdev/flatlaf/util/ScaledNumber.java

@@ -1,77 +0,0 @@
-/*
- * Copyright 2019 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
- *
- *     http://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.util;
-
-import static com.formdev.flatlaf.util.UIScale.scale;
-
-/**
- * A number that scales its value.
- *
- * NOTE:
- * Using ScaledNumber in UI defaults works only if the value is get with
- * sun.swing.DefaultLookup.getInt(), which is used by some basic UI delegates,
- * because this method uses "instanceof Number".
- * UIManager.getInt() on the other hand uses "instanceof Integer" and does not work.
- *
- * @author Karl Tauber
- */
-public class ScaledNumber
-	extends Number
-{
-	private final int value;
-
-	public ScaledNumber( int value ) {
-		this.value = value;
-	}
-
-	@Override
-	public int intValue() {
-		return scale( value );
-	}
-
-	@Override
-	public long longValue() {
-		return scale( value );
-	}
-
-	@Override
-	public float floatValue() {
-		return scale( (float) value );
-	}
-
-	@Override
-	public double doubleValue() {
-		return scale( (float) value );
-	}
-
-	@Override
-	public int hashCode() {
-		return Integer.hashCode( value );
-	}
-
-	@Override
-	public boolean equals( Object obj ) {
-		return (obj instanceof ScaledNumber)
-			? (value == ((ScaledNumber)obj).value)
-			: false;
-	}
-
-	@Override
-	public String toString() {
-		return Integer.toString( value );
-	}
-}

flatlaf-core/src/main/java/com/formdev/flatlaf/util/StringUtils.java

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2019 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
+ *
+ *     http://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.util;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Utility methods for strings.
+ *
+ * @author Karl Tauber
+ */
+public class StringUtils
+{
+	public static String removeLeading( String string, String leading ) {
+		return string.startsWith( leading )
+			? string.substring( leading.length() )
+			: string;
+	}
+
+	public static String removeTrailing( String string, String trailing ) {
+		return string.endsWith( trailing )
+			? string.substring( 0, string.length() - trailing.length() )
+			: string;
+	}
+
+	public static List<String> split( String str, char delim ) {
+		ArrayList<String> strs = new ArrayList<>();
+		int delimIndex = str.indexOf( delim );
+		int index = 0;
+		while( delimIndex >= 0 ) {
+			strs.add( str.substring( index, delimIndex ) );
+			index = delimIndex + 1;
+			delimIndex = str.indexOf( delim, index );
+		}
+		strs.add( str.substring( index ) );
+
+		return strs;
+	}
+}

flatlaf-core/src/main/java/com/formdev/flatlaf/util/SystemInfo.java

@@ -40,6 +40,9 @@ public class SystemInfo
 	// Java VMs
 	public static final boolean IS_JETBRAINS_JVM;
 
+	// UI toolkits
+	public static final boolean IS_KDE;
+
 	static {
 		// platforms
 		String osName = System.getProperty( "os.name" ).toLowerCase( Locale.ENGLISH );
@@ -58,6 +61,9 @@ public class SystemInfo
 		// Java VMs
 		IS_JETBRAINS_JVM = System.getProperty( "java.vm.vendor", "Unknown" )
 			.toLowerCase( Locale.ENGLISH ).contains( "jetbrains" );
+
+		// UI toolkits
+		IS_KDE = (IS_LINUX && System.getenv( "KDE_FULL_SESSION" ) != null);
 	}
 
 	private static long scanVersion( String version ) {

flatlaf-core/src/main/java/com/formdev/flatlaf/util/UIScale.java

@@ -48,8 +48,7 @@ import javax.swing.plaf.UIResource;
  *
  * 2) user scaling mode
  *
- * This mode is for Java 8 compatibility and can be removed when changing minimum
- * required Java version to 9.
+ * This mode is mainly for Java 8 compatibility, but is also used on Linux.
  * The user scale factor is computed based on the used font.
  * The JRE does not scale anything.
  * So we have to invoke {@link #scale(float)} where necessary.
@@ -66,7 +65,7 @@ public class UIScale
 
 	private static Boolean jreHiDPI;
 
-	public static boolean isJreHiDPIEnabled() {
+	public static boolean isSystemScalingEnabled() {
 		if( jreHiDPI != null )
 			return jreHiDPI;
 
@@ -94,11 +93,11 @@ public class UIScale
 	}
 
 	public static double getSystemScaleFactor( Graphics2D g ) {
-		return isJreHiDPIEnabled() ? g.getDeviceConfiguration().getDefaultTransform().getScaleX() : 1;
+		return isSystemScalingEnabled() ? g.getDeviceConfiguration().getDefaultTransform().getScaleX() : 1;
 	}
 
 	public static double getSystemScaleFactor( GraphicsConfiguration gc ) {
-		return isJreHiDPIEnabled() ? gc.getDefaultTransform().getScaleX() : 1;
+		return isSystemScalingEnabled() ? gc.getDefaultTransform().getScaleX() : 1;
 	}
 
 	//---- user scaling (Java 8) ----------------------------------------------
@@ -111,7 +110,7 @@ public class UIScale
 			return;
 		initialized = true;
 
-		if( isEnabled() ) {
+		if( isUserScalingEnabled() ) {
 			// listener to update scale factor if LaF changed or if Label.font changed
 			// (e.g. option "Override default fonts" in IntelliJ IDEA)
 			PropertyChangeListener listener = new PropertyChangeListener() {
@@ -135,7 +134,7 @@ public class UIScale
 	}
 
 	private static void updateScaleFactor() {
-		if( !isEnabled() )
+		if( !isUserScalingEnabled() )
 			return;
 
 		// use font size to calculate scale factor (instead of DPI)
@@ -158,15 +157,15 @@ public class UIScale
 			if( "Tahoma".equals( font.getFamily() ) )
 				fontSizeDivider = 11f;
 		} else if( SystemInfo.IS_LINUX ) {
-			// default font size for Unity and Gnome is 15
-			fontSizeDivider = 15f;
+			// default font size for Unity and Gnome is 15 and for KDE it is 13
+			fontSizeDivider = SystemInfo.IS_KDE ? 13f : 15f;
 		}
 
 		return font.getSize() / fontSizeDivider;
 	}
 
-	private static boolean isEnabled() {
-		if( isJreHiDPIEnabled() )
+	private static boolean isUserScalingEnabled() {
+		if( isSystemScalingEnabled() && !SystemInfo.IS_LINUX )
 			return false; // disable user scaling if JRE scales
 
 		// same as in IntelliJ IDEA
@@ -179,7 +178,7 @@ public class UIScale
 	 * or "sun.java2d.uiScale" to the given font.
 	 */
 	public static FontUIResource applyCustomScaleFactor( FontUIResource font ) {
-		if( UIScale.isJreHiDPIEnabled() )
+		if( UIScale.isSystemScalingEnabled() )
 			return font;
 
 		String uiScale = System.getProperty( "flatlaf.uiScale" );
@@ -198,6 +197,14 @@ public class UIScale
 		return new FontUIResource( font.getFamily(), font.getStyle(), newFontSize );
 	}
 
+	/**
+	 * Scales the given font.
+	 */
+	public static FontUIResource scaleFont( FontUIResource font, float scaleFactor ) {
+		int newFontSize = Math.round( font.getSize() * scaleFactor );
+		return new FontUIResource( font.getFamily(), font.getStyle(), newFontSize );
+	}
+
 	/**
 	 * Similar to sun.java2d.SunGraphicsEnvironment.getScaleFactor(String)
 	 */

flatlaf-core/src/main/module-info/module-info.java

@@ -19,9 +19,12 @@
  */
 module com.formdev.flatlaf {
 	requires java.desktop;
+	requires java.logging;
 
 	exports com.formdev.flatlaf;
 	exports com.formdev.flatlaf.icons;
 	exports com.formdev.flatlaf.ui;
 	exports com.formdev.flatlaf.util;
+
+	uses com.formdev.flatlaf.FlatDefaultsAddon;
 }