Linux: rounded borders for popups (issue #949)

- moved window resizer components from layered pane to rootpane so that border is included in area where user can resize window
- scale border thickness

.github/workflows/ci.yml

@@ -20,8 +20,43 @@ on:
 
 jobs:
   build:
+    name: build (11)
     runs-on: ubuntu-latest
 
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: gradle/actions/wrapper-validation@v4
+
+      - name: Setup Java 11
+        uses: actions/setup-java@v4
+        with:
+          java-version: 11
+          distribution: temurin  # pre-installed on ubuntu-latest
+          cache: gradle
+
+      - name: Check with Error Prone
+        run: ./gradlew errorprone clean
+
+      - name: Build with Gradle
+        run: ./gradlew build
+
+      - name: Upload artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: FlatLaf-build-artifacts
+          path: |
+            flatlaf-*/build/libs
+            flatlaf-*/flatlaf-*/build/libs
+            !**/*-javadoc.jar
+            !**/*-sources.jar
+
+
+  build-on:
+    runs-on: ubuntu-latest
+    needs: build
+    if: github.repository == 'JFormDesigner/FlatLaf'
+
     strategy:
       matrix:
         # test against
@@ -30,7 +65,6 @@ jobs:
         # - latest Java version(s)
         java:
           - 8
-          - 11  # LTS
           - 17  # LTS
           - 21  # LTS
           - 23  # latest
@@ -42,9 +76,6 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: gradle/wrapper-validation-action@v2
-        if: matrix.java == '8'
-
       - name: Setup Java ${{ matrix.java }}
         uses: actions/setup-java@v4
         with:
@@ -52,28 +83,13 @@ jobs:
           distribution: temurin  # Java 8, 11, 17 and 21 are pre-installed on ubuntu-latest
           cache: gradle
 
-      - name: Check with Error Prone
-        if: matrix.java == '11'
-        run: ./gradlew errorprone clean -Dtoolchain=${{ matrix.toolchain }}
-
       - name: Build with Gradle
         run: ./gradlew build -Dtoolchain=${{ matrix.toolchain }}
 
-      - name: Upload artifacts
-        uses: actions/upload-artifact@v4
-        if: matrix.java == '11'
-        with:
-          name: FlatLaf-build-artifacts
-          path: |
-            flatlaf-*/build/libs
-            flatlaf-*/flatlaf-*/build/libs
-            !**/*-javadoc.jar
-            !**/*-sources.jar
-
 
   snapshot:
     runs-on: ubuntu-latest
-    needs: build
+    needs: build-on
     if: |
       github.event_name == 'push' &&
       (github.ref == 'refs/heads/main' || startsWith( github.ref, 'refs/heads/develop-' )) &&
@@ -90,26 +106,15 @@ jobs:
           cache: gradle
 
       - name: Publish snapshot to oss.sonatype.org
-        run: ./gradlew publish :flatlaf-theme-editor:build -PskipFonts -Dorg.gradle.internal.publish.checksums.insecure=true -Dorg.gradle.parallel=false
+        run: ./gradlew publish -PskipFonts -Dorg.gradle.internal.publish.checksums.insecure=true -Dorg.gradle.parallel=false
         env:
           OSSRH_USERNAME: ${{ secrets.OSSRH_USERNAME }}
           OSSRH_PASSWORD: ${{ secrets.OSSRH_PASSWORD }}
 
-      - name: Upload theme editor
-        uses: sebastianpopp/ftp-action@releases/v2
-        with:
-          host: ${{ secrets.FTP_SERVER }}
-          user: ${{ secrets.FTP_USERNAME }}
-          password: ${{ secrets.FTP_PASSWORD }}
-          forceSsl: true
-          localDir: "flatlaf-theme-editor/build/libs"
-          remoteDir: "snapshots"
-          options: "--only-newer --no-recursion --verbose=1"
-
 
   release:
     runs-on: ubuntu-latest
-    needs: build
+    needs: build-on
     if: |
       github.event_name == 'push' &&
       startsWith( github.ref, 'refs/tags/' ) &&
@@ -133,24 +138,12 @@ jobs:
           SIGNING_KEY:      ${{ secrets.SIGNING_KEY }}
           SIGNING_PASSWORD: ${{ secrets.SIGNING_PASSWORD }}
 
-      - name: Upload demo
+      - name: Install lftp
-        uses: sebastianpopp/ftp-action@releases/v2
+        run: sudo apt-get -y install lftp
-        with:
-          host: ${{ secrets.FTP_SERVER }}
-          user: ${{ secrets.FTP_USERNAME }}
-          password: ${{ secrets.FTP_PASSWORD }}
-          forceSsl: true
-          localDir: "flatlaf-demo/build/libs"
-          remoteDir: "."
-          options: "--only-newer --no-recursion --verbose=1"
 
-      - name: Upload theme editor
+      - name: Upload demo and theme editor
-        uses: sebastianpopp/ftp-action@releases/v2
+        run: >
-        with:
+          lftp -c "set ftp:ssl-force true;
-          host: ${{ secrets.FTP_SERVER }}
+            open -u ${{ secrets.FTP_USERNAME }},${{ secrets.FTP_PASSWORD }} ${{ secrets.FTP_SERVER }};
-          user: ${{ secrets.FTP_USERNAME }}
+            mput flatlaf-demo/build/libs/flatlaf-demo-*.jar;
-          password: ${{ secrets.FTP_PASSWORD }}
+            mput flatlaf-theme-editor/build/libs/flatlaf-theme-editor-*.jar"
-          forceSsl: true
-          localDir: "flatlaf-theme-editor/build/libs"
-          remoteDir: "."
-          options: "--only-newer --no-recursion --verbose=1"

.github/workflows/natives.yml

@@ -21,16 +21,25 @@ jobs:
         strategy:
             matrix:
                 os:
-                    - windows
+                    - windows-latest
-                    - macos
+                    - macos-latest
-                    - ubuntu
+                    - ubuntu-latest
+                    - ubuntu-24.04-arm
 
-        runs-on: ${{ matrix.os }}-latest
+        runs-on: ${{ matrix.os }}
 
         steps:
             - uses: actions/checkout@v4
 
-            - uses: gradle/wrapper-validation-action@v2
+            - uses: gradle/actions/wrapper-validation@v4
+
+            - name: install libxt-dev
+              if: matrix.os == 'ubuntu-latest' || matrix.os == 'ubuntu-24.04-arm'
+              run: sudo apt install libxt-dev
+
+            - name: install g++-aarch64-linux-gnu
+              if: matrix.os == 'ubuntu-latest'
+              run: sudo apt install g++-aarch64-linux-gnu
 
             - name: Setup Java 11
               uses: actions/setup-java@v4

CHANGELOG.md

@@ -1,6 +1,50 @@
 FlatLaf Change Log
 ==================
 
+## 3.6-SNAPSHOT
+
+#### New features and improvements
+
+- macOS: Re-enabled rounded popup border (see PR #772) on macOS 14.4+ (was
+  disabled in 3.5.x).
+- CheckBox: Support styling indeterminate state of
+  [tri-state check boxes](https://www.javadoc.io/doc/com.formdev/flatlaf-extras/latest/com/formdev/flatlaf/extras/components/FlatTriStateCheckBox.html).
+  (PR #936; issue #919)
+- List: Support for alternate row highlighting. (PR #939)
+- Tree: Support for alternate row highlighting. (PR #903)
+- Tree: Support wide cell renderer. (issue #922)
+- Extras: `FlatSVGIcon` color filters now can access painting component to
+  implement component state based color mappings. (issue #906)
+- Linux: Added `libflatlaf-linux-arm64.so` for Linux on ARM64. (issue #899)
+
+#### Fixed bugs
+
+- Button: Fixed background and foreground colors for `borderless` and
+  `toolBarButton` style default buttons (`JButton.isDefaultButton()` is `true`).
+  (issue #947)
+- FileChooser: Improved performance when navigating to large directories with
+  thousands of files. (issue #953)
+- PopupFactory: Fixed NPE on Windows 10 when `owner` is `null`. (issue #952)
+- Popup: On Windows 10, drop shadow of heavy-weight popup was not updated if
+  popup moved/resized. (issue #942)
+- FlatLaf window decorations: Minimize and maximize icons were not shown for
+  custom scale factors less than 100% (e.g. `-Dflatlaf.uiScale=75%`). (issue
+  #951)
+- Linux: Popups (menus and combobox lists) were not hidden when window is moved,
+  resized, maximized, restored, iconified or switched to another window. (issue
+  #962)
+
+
+## 3.5.4
+
+#### Fixed bugs
+
+- HTML: Fixed NPE when using HTML text on a component with `null` font. (issue
+  #930; PR #931; regression in 3.5)
+- Linux: Fixed NPE when using FlatLaf window decorations and switching theme.
+  (issue #933; regression in 3.5.3)
+
+
 ## 3.5.3
 
 #### Fixed bugs

README.md

@@ -35,7 +35,9 @@ Sponsors
 
 ### Current Sponsors
 
-[![None Sponsors](images/none-sponsors.png)](https://www.formdev.com/flatlaf/sponsor/)
+<a href="https://exocharts.com/"><img src="https://www.formdev.com/flatlaf/sponsor/Exocharts.png" width="200" alt="Exocharts" title="Exocharts - Professional Grade OrderFlow"></a>
+
+<!-- [![None Sponsors](images/none-sponsors.png)](https://www.formdev.com/flatlaf/sponsor/) -->
 
 [Become a Sponsor](https://www.formdev.com/flatlaf/sponsor/)
 

flatlaf-core/build.gradle.kts

@@ -156,5 +156,6 @@ flatlafPublish {
 		NativeArtifact( "${natives}/libflatlaf-macos-arm64.dylib",  "macos-arm64",    "dylib" ),
 		NativeArtifact( "${natives}/libflatlaf-macos-x86_64.dylib", "macos-x86_64",   "dylib" ),
 		NativeArtifact( "${natives}/libflatlaf-linux-x86_64.so",    "linux-x86_64",   "so" ),
+		NativeArtifact( "${natives}/libflatlaf-linux-arm64.so",     "linux-arm64",    "so" ),
 	)
 }

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

@@ -384,6 +384,7 @@ public interface FlatClientProperties
 	 *     If this value is {@code 1 - 4}, then {@code DWMWCP_ROUNDSMALL} is used.
 	 *     If it is {@code >= 5}, then {@code DWMWCP_ROUND} is used.
 	 * <li><strong>macOS</strong> (10.14 and later): Any corner radius is supported.
+	 * <li><strong>Linux</strong> (since FlatLaf 3.6): Any corner radius is supported.
 	 * </ul>
 	 * <strong>Component</strong> {@link javax.swing.JComponent}<br>
 	 * <strong>Value type</strong> {@link java.lang.Integer}<br>
@@ -402,6 +403,7 @@ public interface FlatClientProperties
 	 * Supported platforms:
 	 * <ul>
 	 * <li><strong>macOS</strong> (10.14 and later)
+	 * <li><strong>Linux</strong> (since FlatLaf 3.6)
 	 * </ul>
 	 * <strong>Component</strong> {@link javax.swing.JComponent}<br>
 	 * <strong>Value type</strong> {@link java.lang.Integer} or {@link java.lang.Float}<br>
@@ -1410,13 +1412,23 @@ public interface FlatClientProperties
 	//---- JTree --------------------------------------------------------------
 
 	/**
-	 * Override if a tree shows a wide selection. Default is {@code true}.
+	 * Specifies whether tree shows a wide selection. Default is {@code true}.
 	 * <p>
 	 * <strong>Component</strong> {@link javax.swing.JTree}<br>
 	 * <strong>Value type</strong> {@link java.lang.Boolean}
 	 */
 	String TREE_WIDE_SELECTION = "JTree.wideSelection";
 
+	/**
+	 * Specifies whether tree uses a wide cell renderer. Default is {@code false}.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JTree}<br>
+	 * <strong>Value type</strong> {@link java.lang.Boolean}
+	 *
+	 * @since 3.6
+	 */
+	String TREE_WIDE_CELL_RENDERER = "JTree.wideCellRenderer";
+
 	/**
 	 * Specifies whether tree item selection is painted. Default is {@code true}.
 	 * If set to {@code false}, then the tree cell renderer is responsible for painting selection.

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

@@ -111,6 +111,7 @@ public abstract class FlatLaf
 	private PopupFactory oldPopupFactory;
 	private MnemonicHandler mnemonicHandler;
 	private boolean subMenuUsabilityHelperInstalled;
+	private LinuxPopupMenuCanceler linuxPopupMenuCanceler;
 
 	private Consumer<UIDefaults> postInitialization;
 	private List<Function<Object, Object>> uiDefaultsGetters;
@@ -305,6 +306,10 @@ public abstract class FlatLaf
 		// install submenu usability helper
 		subMenuUsabilityHelperInstalled = SubMenuUsabilityHelper.install();
 
+		// install Linux popup menu canceler
+		if( SystemInfo.isLinux )
+			linuxPopupMenuCanceler = new LinuxPopupMenuCanceler();
+
 		// listen to desktop property changes to update UI if system font or scaling changes
 		if( SystemInfo.isWindows ) {
 			// Windows 10 allows increasing font size independent of scaling:
@@ -397,6 +402,12 @@ public abstract class FlatLaf
 			subMenuUsabilityHelperInstalled = false;
 		}
 
+		// uninstall Linux popup menu canceler
+		if( linuxPopupMenuCanceler != null ) {
+			linuxPopupMenuCanceler.uninstall();
+			linuxPopupMenuCanceler = null;
+		}
+
 		// restore default link color
 		new HTMLEditorKit().getStyleSheet().addRule( "a, address { color: blue; }" );
 		postInitialization = null;

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

@@ -141,7 +141,7 @@ public interface FlatSystemProperties
 	 * (requires Windows 11 or macOS)
 	 * <p>
 	 * <strong>Allowed Values</strong> {@code false} and {@code true}<br>
-	 * <strong>Default</strong> {@code true}; except on macOS 14.4+ where it is {@code false}
+	 * <strong>Default</strong> {@code true}; except in FlatLaf 3.5.x on macOS 14.4+ where it was {@code false}
 	 *
 	 * @since 3.5.2
 	 */

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

@@ -0,0 +1,164 @@
+/*
+ * Copyright 2025 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf;
+
+import java.awt.Component;
+import java.awt.Window;
+import java.awt.event.ComponentEvent;
+import java.awt.event.ComponentListener;
+import java.awt.event.WindowAdapter;
+import java.awt.event.WindowEvent;
+import javax.swing.JPopupMenu;
+import javax.swing.MenuElement;
+import javax.swing.MenuSelectionManager;
+import javax.swing.SwingUtilities;
+import javax.swing.event.ChangeEvent;
+import javax.swing.event.ChangeListener;
+
+/**
+ * Cancels (hides) popup menus on Linux.
+ * <p>
+ * On Linux, popups are not hidden under following conditions, which results in
+ * misplaced popups:
+ * <ul>
+ *   <li>window moved or resized
+ *   <li>window maximized or restored
+ *   <li>window iconified
+ *   <li>window deactivated (e.g. activated other application)
+ * </ul>
+ *
+ * On Windows and macOS, popups are automatically hidden.
+ * <p>
+ * The implementation is similar to what's done in
+ * {@code javax.swing.plaf.basic.BasicPopupMenuUI.MouseGrabber},
+ * but only hides popup in some conditions.
+ *
+ * @author Karl Tauber
+ */
+class LinuxPopupMenuCanceler
+	extends WindowAdapter
+	implements ChangeListener, ComponentListener
+{
+	private MenuElement[] lastPathSelectedPath;
+	private Window window;
+
+	LinuxPopupMenuCanceler() {
+		MenuSelectionManager msm = MenuSelectionManager.defaultManager();
+		msm.addChangeListener( this );
+
+		lastPathSelectedPath = msm.getSelectedPath();
+		if( lastPathSelectedPath.length > 0 )
+			addWindowListeners( lastPathSelectedPath[0] );
+	}
+
+	void uninstall() {
+		MenuSelectionManager.defaultManager().removeChangeListener( this );
+	}
+
+	private void addWindowListeners( MenuElement selected ) {
+		// see BasicPopupMenuUI.MouseGrabber.grabWindow()
+		Component invoker = selected.getComponent();
+		if( invoker instanceof JPopupMenu )
+			invoker = ((JPopupMenu)invoker).getInvoker();
+		window = (invoker instanceof Window)
+			? (Window) invoker
+			: SwingUtilities.windowForComponent( invoker );
+
+		if( window != null ) {
+			window.addWindowListener( this );
+			window.addComponentListener( this );
+		}
+	}
+
+	private void removeWindowListeners() {
+		if( window != null ) {
+			window.removeWindowListener( this );
+			window.removeComponentListener( this );
+			window = null;
+		}
+	}
+
+	private void cancelPopupMenu() {
+		try {
+			MenuSelectionManager msm = MenuSelectionManager.defaultManager();
+			MenuElement[] selectedPath = msm.getSelectedPath();
+			for( MenuElement e : selectedPath ) {
+				if( e instanceof JPopupMenu )
+					((JPopupMenu)e).putClientProperty( "JPopupMenu.firePopupMenuCanceled", true );
+			}
+			msm.clearSelectedPath();
+		} catch( RuntimeException ex ) {
+			removeWindowListeners();
+			throw ex;
+		} catch( Error ex ) {
+			removeWindowListeners();
+			throw ex;
+		}
+	}
+
+	//---- ChangeListener ----
+
+	@Override
+	public void stateChanged( ChangeEvent e ) {
+		MenuElement[] selectedPath = MenuSelectionManager.defaultManager().getSelectedPath();
+
+		if( selectedPath.length == 0 )
+			removeWindowListeners();
+		else if( lastPathSelectedPath.length == 0 )
+			addWindowListeners( selectedPath[0] );
+
+		lastPathSelectedPath = selectedPath;
+	}
+
+	//---- WindowListener ----
+
+	@Override
+	public void windowIconified( WindowEvent e ) {
+		cancelPopupMenu();
+	}
+
+	@Override
+	public void windowDeactivated( WindowEvent e ) {
+		cancelPopupMenu();
+	}
+
+	@Override
+	public void windowClosing( WindowEvent e ) {
+		cancelPopupMenu();
+	}
+
+	//---- ComponentListener ----
+
+	@Override
+	public void componentResized( ComponentEvent e ) {
+		cancelPopupMenu();
+	}
+
+	@Override
+	public void componentMoved( ComponentEvent e ) {
+		cancelPopupMenu();
+	}
+
+	@Override
+	public void componentShown( ComponentEvent e ) {
+	}
+
+	@Override
+	public void componentHidden( ComponentEvent e ) {
+		cancelPopupMenu();
+	}
+}

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

@@ -17,6 +17,7 @@
 package com.formdev.flatlaf.icons;
 
 import static com.formdev.flatlaf.FlatClientProperties.*;
+import static com.formdev.flatlaf.ui.FlatUIUtils.stateColor;
 import java.awt.BasicStroke;
 import java.awt.Color;
 import java.awt.Component;
@@ -48,6 +49,8 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
  * @uiDefault CheckBox.icon.borderWidth					int or float	optional; defaults to Component.borderWidth
  * @uiDefault CheckBox.icon.selectedBorderWidth			int or float	optional; defaults to CheckBox.icon.borderWidth
  * @uiDefault CheckBox.icon.disabledSelectedBorderWidth	int or float	optional; defaults to CheckBox.icon.selectedBorderWidth
+ * @uiDefault CheckBox.icon.indeterminateBorderWidth			int or float	optional; defaults to CheckBox.icon.selectedBorderWidth
+ * @uiDefault CheckBox.icon.disabledIndeterminateBorderWidth	int or float	optional; defaults to CheckBox.icon.disabledSelectedBorderWidth
  * @uiDefault CheckBox.arc								int
  *
  * @uiDefault CheckBox.icon.focusColor					Color	optional; defaults to Component.focusColor
@@ -56,30 +59,45 @@ import com.formdev.flatlaf.ui.FlatUIUtils;
  * @uiDefault CheckBox.icon.selectedBorderColor			Color
  * @uiDefault CheckBox.icon.selectedBackground			Color
  * @uiDefault CheckBox.icon.checkmarkColor				Color
+ * @uiDefault CheckBox.icon.indeterminateBorderColor	Color	optional; defaults to CheckBox.icon.selectedBorderColor
+ * @uiDefault CheckBox.icon.indeterminateBackground		Color	optional; defaults to CheckBox.icon.selectedBackground
+ * @uiDefault CheckBox.icon.indeterminateCheckmarkColor	Color	optional; defaults to CheckBox.icon.checkmarkColor
  *
- * @uiDefault CheckBox.icon.disabledBorderColor			Color
+ * @uiDefault CheckBox.icon.disabledBorderColor					Color
- * @uiDefault CheckBox.icon.disabledBackground			Color
+ * @uiDefault CheckBox.icon.disabledBackground					Color
- * @uiDefault CheckBox.icon.disabledSelectedBorderColor	Color	optional; CheckBox.icon.disabledBorderColor is used if not specified
+ * @uiDefault CheckBox.icon.disabledSelectedBorderColor			Color	optional; defaults to CheckBox.icon.disabledBorderColor
- * @uiDefault CheckBox.icon.disabledSelectedBackground	Color	optional; CheckBox.icon.disabledBackground is used if not specified
+ * @uiDefault CheckBox.icon.disabledSelectedBackground			Color	optional; defaults to CheckBox.icon.disabledBackground
- * @uiDefault CheckBox.icon.disabledCheckmarkColor		Color
+ * @uiDefault CheckBox.icon.disabledCheckmarkColor				Color
+ * @uiDefault CheckBox.icon.disabledIndeterminateBorderColor	Color	optional; defaults to CheckBox.icon.disabledSelectedBorderColor
+ * @uiDefault CheckBox.icon.disabledIndeterminateBackground		Color	optional; defaults to CheckBox.icon.disabledSelectedBackground
+ * @uiDefault CheckBox.icon.disabledIndeterminateCheckmarkColor	Color	optional; defaults to CheckBox.icon.disabledCheckmarkColor
  *
- * @uiDefault CheckBox.icon.focusedBorderColor			Color	optional
+ * @uiDefault CheckBox.icon.focusedBorderColor					Color	optional
- * @uiDefault CheckBox.icon.focusedBackground			Color	optional
+ * @uiDefault CheckBox.icon.focusedBackground					Color	optional
- * @uiDefault CheckBox.icon.focusedSelectedBorderColor	Color	optional; CheckBox.icon.focusedBorderColor is used if not specified
+ * @uiDefault CheckBox.icon.focusedSelectedBorderColor			Color	optional; defaults to CheckBox.icon.focusedBorderColor
- * @uiDefault CheckBox.icon.focusedSelectedBackground	Color	optional; CheckBox.icon.focusedBackground is used if not specified
+ * @uiDefault CheckBox.icon.focusedSelectedBackground			Color	optional; defaults to CheckBox.icon.focusedBackground
- * @uiDefault CheckBox.icon.focusedCheckmarkColor		Color	optional; CheckBox.icon.checkmarkColor is used if not specified
+ * @uiDefault CheckBox.icon.focusedCheckmarkColor				Color	optional; defaults to CheckBox.icon.checkmarkColor
+ * @uiDefault CheckBox.icon.focusedIndeterminateBorderColor		Color	optional; defaults to CheckBox.icon.focusedSelectedBorderColor
+ * @uiDefault CheckBox.icon.focusedIndeterminateBackground		Color	optional; defaults to CheckBox.icon.focusedSelectedBackground
+ * @uiDefault CheckBox.icon.focusedIndeterminateCheckmarkColor	Color	optional; defaults to CheckBox.icon.focusedCheckmarkColor
  *
- * @uiDefault CheckBox.icon.hoverBorderColor			Color	optional
+ * @uiDefault CheckBox.icon.hoverBorderColor					Color	optional
- * @uiDefault CheckBox.icon.hoverBackground				Color	optional
+ * @uiDefault CheckBox.icon.hoverBackground						Color	optional
- * @uiDefault CheckBox.icon.hoverSelectedBorderColor	Color	optional; CheckBox.icon.hoverBorderColor is used if not specified
+ * @uiDefault CheckBox.icon.hoverSelectedBorderColor			Color	optional; defaults to CheckBox.icon.hoverBorderColor
- * @uiDefault CheckBox.icon.hoverSelectedBackground		Color	optional; CheckBox.icon.hoverBackground is used if not specified
+ * @uiDefault CheckBox.icon.hoverSelectedBackground				Color	optional; defaults to CheckBox.icon.hoverBackground
- * @uiDefault CheckBox.icon.hoverCheckmarkColor			Color	optional; CheckBox.icon.checkmarkColor is used if not specified
+ * @uiDefault CheckBox.icon.hoverCheckmarkColor					Color	optional; defaults to CheckBox.icon.checkmarkColor
+ * @uiDefault CheckBox.icon.hoverIndeterminateBorderColor		Color	optional; defaults to CheckBox.icon.hoverSelectedBorderColor
+ * @uiDefault CheckBox.icon.hoverIndeterminateBackground		Color	optional; defaults to CheckBox.icon.hoverSelectedBackground
+ * @uiDefault CheckBox.icon.hoverIndeterminateCheckmarkColor	Color	optional; defaults to CheckBox.icon.hoverCheckmarkColor
  *
- * @uiDefault CheckBox.icon.pressedBorderColor			Color	optional
+ * @uiDefault CheckBox.icon.pressedBorderColor					Color	optional
- * @uiDefault CheckBox.icon.pressedBackground			Color	optional
+ * @uiDefault CheckBox.icon.pressedBackground					Color	optional
- * @uiDefault CheckBox.icon.pressedSelectedBorderColor	Color	optional; CheckBox.icon.pressedBorderColor is used if not specified
+ * @uiDefault CheckBox.icon.pressedSelectedBorderColor			Color	optional; defaults to CheckBox.icon.pressedBorderColor
- * @uiDefault CheckBox.icon.pressedSelectedBackground	Color	optional; CheckBox.icon.pressedBackground is used if not specified
+ * @uiDefault CheckBox.icon.pressedSelectedBackground			Color	optional; defaults to CheckBox.icon.pressedBackground
- * @uiDefault CheckBox.icon.pressedCheckmarkColor		Color	optional; CheckBox.icon.checkmarkColor is used if not specified
+ * @uiDefault CheckBox.icon.pressedCheckmarkColor				Color	optional; defaults to CheckBox.icon.checkmarkColor
+ * @uiDefault CheckBox.icon.pressedIndeterminateBorderColor		Color	optional; defaults to CheckBox.icon.pressedSelectedBorderColor
+ * @uiDefault CheckBox.icon.pressedIndeterminateBackground		Color	optional; defaults to CheckBox.icon.pressedSelectedBackground
+ * @uiDefault CheckBox.icon.pressedIndeterminateCheckmarkColor	Color	optional; defaults to CheckBox.icon.pressedCheckmarkColor
  *
  * @author Karl Tauber
  */
@@ -92,6 +110,8 @@ public class FlatCheckBoxIcon
 	/** @since 2 */ @Styleable protected float borderWidth = getUIFloat( "CheckBox.icon.borderWidth", FlatUIUtils.getUIFloat( "Component.borderWidth", 1 ), style );
 	/** @since 2 */ @Styleable protected float selectedBorderWidth = getUIFloat( "CheckBox.icon.selectedBorderWidth", Float.MIN_VALUE, style );
 	/** @since 2 */ @Styleable protected float disabledSelectedBorderWidth = getUIFloat( "CheckBox.icon.disabledSelectedBorderWidth", Float.MIN_VALUE, style );
+	/** @since 3.6 */ @Styleable protected float indeterminateBorderWidth = getUIFloat( "CheckBox.icon.indeterminateBorderWidth", Float.MIN_VALUE, style );
+	/** @since 3.6 */ @Styleable protected float disabledIndeterminateBorderWidth = getUIFloat( "CheckBox.icon.disabledIndeterminateBorderWidth", Float.MIN_VALUE, style );
 	@Styleable protected int arc = FlatUIUtils.getUIInt( "CheckBox.arc", 2 );
 
 	// enabled
@@ -100,6 +120,9 @@ public class FlatCheckBoxIcon
 	@Styleable protected Color selectedBorderColor = getUIColor( "CheckBox.icon.selectedBorderColor", style );
 	@Styleable protected Color selectedBackground = getUIColor( "CheckBox.icon.selectedBackground", style );
 	@Styleable protected Color checkmarkColor = getUIColor( "CheckBox.icon.checkmarkColor", style );
+	/** @since 3.6 */ @Styleable protected Color indeterminateBorderColor = getUIColor( "CheckBox.icon.indeterminateBorderColor", style );
+	/** @since 3.6 */ @Styleable protected Color indeterminateBackground = getUIColor( "CheckBox.icon.indeterminateBackground", style );
+	/** @since 3.6 */ @Styleable protected Color indeterminateCheckmarkColor = getUIColor( "CheckBox.icon.indeterminateCheckmarkColor", style );
 
 	// disabled
 	@Styleable protected Color disabledBorderColor = getUIColor( "CheckBox.icon.disabledBorderColor", style );
@@ -107,6 +130,9 @@ public class FlatCheckBoxIcon
 	/** @since 2 */ @Styleable protected Color disabledSelectedBorderColor = getUIColor( "CheckBox.icon.disabledSelectedBorderColor", style );
 	/** @since 2 */ @Styleable protected Color disabledSelectedBackground = getUIColor( "CheckBox.icon.disabledSelectedBackground", style );
 	@Styleable protected Color disabledCheckmarkColor = getUIColor( "CheckBox.icon.disabledCheckmarkColor", style );
+	/** @since 3.6 */ @Styleable protected Color disabledIndeterminateBorderColor = getUIColor( "CheckBox.icon.disabledIndeterminateBorderColor", style );
+	/** @since 3.6 */ @Styleable protected Color disabledIndeterminateBackground = getUIColor( "CheckBox.icon.disabledIndeterminateBackground", style );
+	/** @since 3.6 */ @Styleable protected Color disabledIndeterminateCheckmarkColor = getUIColor( "CheckBox.icon.disabledIndeterminateCheckmarkColor", style );
 
 	// focused
 	@Styleable protected Color focusedBorderColor = getUIColor( "CheckBox.icon.focusedBorderColor", style );
@@ -114,6 +140,9 @@ public class FlatCheckBoxIcon
 	/** @since 2 */ @Styleable protected Color focusedSelectedBorderColor = getUIColor( "CheckBox.icon.focusedSelectedBorderColor", style );
 	/** @since 2 */ @Styleable protected Color focusedSelectedBackground = getUIColor( "CheckBox.icon.focusedSelectedBackground", style );
 	/** @since 2 */ @Styleable protected Color focusedCheckmarkColor = getUIColor( "CheckBox.icon.focusedCheckmarkColor", style );
+	/** @since 3.6 */ @Styleable protected Color focusedIndeterminateBorderColor = getUIColor( "CheckBox.icon.focusedIndeterminateBorderColor", style );
+	/** @since 3.6 */ @Styleable protected Color focusedIndeterminateBackground = getUIColor( "CheckBox.icon.focusedIndeterminateBackground", style );
+	/** @since 3.6 */ @Styleable protected Color focusedIndeterminateCheckmarkColor = getUIColor( "CheckBox.icon.focusedIndeterminateCheckmarkColor", style );
 
 	// hover
 	@Styleable protected Color hoverBorderColor = getUIColor( "CheckBox.icon.hoverBorderColor", style );
@@ -121,6 +150,9 @@ public class FlatCheckBoxIcon
 	/** @since 2 */ @Styleable protected Color hoverSelectedBorderColor = getUIColor( "CheckBox.icon.hoverSelectedBorderColor", style );
 	/** @since 2 */ @Styleable protected Color hoverSelectedBackground = getUIColor( "CheckBox.icon.hoverSelectedBackground", style );
 	/** @since 2 */ @Styleable protected Color hoverCheckmarkColor = getUIColor( "CheckBox.icon.hoverCheckmarkColor", style );
+	/** @since 3.6 */ @Styleable protected Color hoverIndeterminateBorderColor = getUIColor( "CheckBox.icon.hoverIndeterminateBorderColor", style );
+	/** @since 3.6 */ @Styleable protected Color hoverIndeterminateBackground = getUIColor( "CheckBox.icon.hoverIndeterminateBackground", style );
+	/** @since 3.6 */ @Styleable protected Color hoverIndeterminateCheckmarkColor = getUIColor( "CheckBox.icon.hoverIndeterminateCheckmarkColor", style );
 
 	// pressed
 	/** @since 2 */ @Styleable protected Color pressedBorderColor = getUIColor( "CheckBox.icon.pressedBorderColor", style );
@@ -128,6 +160,9 @@ public class FlatCheckBoxIcon
 	/** @since 2 */ @Styleable protected Color pressedSelectedBorderColor = getUIColor( "CheckBox.icon.pressedSelectedBorderColor", style );
 	/** @since 2 */ @Styleable protected Color pressedSelectedBackground = getUIColor( "CheckBox.icon.pressedSelectedBackground", style );
 	/** @since 2 */ @Styleable protected Color pressedCheckmarkColor = getUIColor( "CheckBox.icon.pressedCheckmarkColor", style );
+	/** @since 3.6 */ @Styleable protected Color pressedIndeterminateBorderColor = getUIColor( "CheckBox.icon.pressedIndeterminateBorderColor", style );
+	/** @since 3.6 */ @Styleable protected Color pressedIndeterminateBackground = getUIColor( "CheckBox.icon.pressedIndeterminateBackground", style );
+	/** @since 3.6 */ @Styleable protected Color pressedIndeterminateCheckmarkColor = getUIColor( "CheckBox.icon.pressedIndeterminateCheckmarkColor", style );
 
 	protected String getPropertyPrefix() {
 		return "CheckBox.";
@@ -182,11 +217,17 @@ public class FlatCheckBoxIcon
 		boolean indeterminate = isIndeterminate( c );
 		boolean selected = indeterminate || isSelected( c );
 		boolean isFocused = FlatUIUtils.isPermanentFocusOwner( c );
-		float bw = selected
+		float bw = Float.MIN_VALUE;
-			? (disabledSelectedBorderWidth != Float.MIN_VALUE && !c.isEnabled()
+		if( !c.isEnabled() ) {
-				? disabledSelectedBorderWidth
+			bw = (indeterminate && disabledIndeterminateBorderWidth != Float.MIN_VALUE)
-				: (selectedBorderWidth != Float.MIN_VALUE ? selectedBorderWidth : borderWidth))
+				? disabledIndeterminateBorderWidth
-			: borderWidth;
+				: (selected ? disabledSelectedBorderWidth : selectedBorderWidth);
+		}
+		if( bw == Float.MIN_VALUE ) {
+			bw = (indeterminate && indeterminateBorderWidth != Float.MIN_VALUE)
+				? indeterminateBorderWidth
+				: ((selected && selectedBorderWidth != Float.MIN_VALUE) ? selectedBorderWidth : borderWidth);
+		}
 
 		// paint focused border
 		if( isFocused && focusWidth > 0 && FlatButtonUI.isFocusPainted( c ) ) {
@@ -195,15 +236,15 @@ public class FlatCheckBoxIcon
 		}
 
 		// paint border
-		g.setColor( getBorderColor( c, selected ) );
+		g.setColor( getBorderColor( c, selected, indeterminate ) );
 		paintBorder( c, g, bw );
 
 		// paint background
-		Color bg = FlatUIUtils.deriveColor( getBackground( c, selected ),
+		Color baseBg = stateColor( indeterminate, indeterminateBackground, selected, selectedBackground, background );
-			selected ? selectedBackground : background );
+		Color bg = FlatUIUtils.deriveColor( getBackground( c, selected, indeterminate ), baseBg );
 		if( bg.getAlpha() < 255 ) {
 			// fill background with default color before filling with non-opaque background
-			g.setColor( selected ? selectedBackground : background );
+			g.setColor( baseBg );
 			paintBackground( c, g, bw );
 		}
 		g.setColor( bg );
@@ -211,7 +252,7 @@ public class FlatCheckBoxIcon
 
 		// paint checkmark
 		if( selected ) {
-			g.setColor( getCheckmarkColor( c ) );
+			g.setColor( getCheckmarkColor( c, indeterminate ) );
 			if( indeterminate )
 				paintIndeterminate( c, g );
 			else
@@ -272,30 +313,33 @@ public class FlatCheckBoxIcon
 		return focusColor;
 	}
 
-	protected Color getBorderColor( Component c, boolean selected ) {
+	/** @since 3.6 */
+	protected Color getBorderColor( Component c, boolean selected, boolean indeterminate ) {
 		return FlatButtonUI.buttonStateColor( c,
-			selected ? selectedBorderColor : borderColor,
+			stateColor( indeterminate, indeterminateBorderColor,         selected, selectedBorderColor,         borderColor ),
-			(selected && disabledSelectedBorderColor != null) ? disabledSelectedBorderColor : disabledBorderColor,
+			stateColor( indeterminate, disabledIndeterminateBorderColor, selected, disabledSelectedBorderColor, disabledBorderColor ),
-			(selected && focusedSelectedBorderColor != null) ? focusedSelectedBorderColor : focusedBorderColor,
+			stateColor( indeterminate, focusedIndeterminateBorderColor,  selected, focusedSelectedBorderColor,  focusedBorderColor ),
-			(selected && hoverSelectedBorderColor != null) ? hoverSelectedBorderColor : hoverBorderColor,
+			stateColor( indeterminate, hoverIndeterminateBorderColor,    selected, hoverSelectedBorderColor,    hoverBorderColor ),
-			(selected && pressedSelectedBorderColor != null) ? pressedSelectedBorderColor : pressedBorderColor );
+			stateColor( indeterminate, pressedIndeterminateBorderColor,  selected, pressedSelectedBorderColor,  pressedBorderColor ) );
 	}
 
-	protected Color getBackground( Component c, boolean selected ) {
+	/** @since 3.6 */
+	protected Color getBackground( Component c, boolean selected, boolean indeterminate ) {
 		return FlatButtonUI.buttonStateColor( c,
-			selected ? selectedBackground : background,
+			stateColor( indeterminate, indeterminateBackground,          selected, selectedBackground,          background ),
-			(selected && disabledSelectedBackground != null) ? disabledSelectedBackground : disabledBackground,
+			stateColor( indeterminate, disabledIndeterminateBackground,  selected, disabledSelectedBackground,  disabledBackground ),
-			(selected && focusedSelectedBackground != null) ? focusedSelectedBackground : focusedBackground,
+			stateColor( indeterminate, focusedIndeterminateBackground,   selected, focusedSelectedBackground,   focusedBackground ),
-			(selected && hoverSelectedBackground != null) ? hoverSelectedBackground : hoverBackground,
+			stateColor( indeterminate, hoverIndeterminateBackground,     selected, hoverSelectedBackground,     hoverBackground ),
-			(selected && pressedSelectedBackground != null) ? pressedSelectedBackground : pressedBackground );
+			stateColor( indeterminate, pressedIndeterminateBackground,   selected, pressedSelectedBackground,   pressedBackground ) );
 	}
 
-	protected Color getCheckmarkColor( Component c ) {
+	/** @since 3.6 */
+	protected Color getCheckmarkColor( Component c, boolean indeterminate ) {
 		return FlatButtonUI.buttonStateColor( c,
-			checkmarkColor,
+			stateColor( indeterminate, indeterminateCheckmarkColor, checkmarkColor ),
-			disabledCheckmarkColor,
+			stateColor( indeterminate, disabledIndeterminateCheckmarkColor, disabledCheckmarkColor ),
-			focusedCheckmarkColor,
+			stateColor( indeterminate, focusedIndeterminateCheckmarkColor, focusedCheckmarkColor ),
-			hoverCheckmarkColor,
+			stateColor( indeterminate, hoverIndeterminateCheckmarkColor, hoverCheckmarkColor ),
-			pressedCheckmarkColor );
+			stateColor( indeterminate, pressedIndeterminateCheckmarkColor, pressedCheckmarkColor ) );
 	}
 }

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

@@ -63,7 +63,7 @@ public class FlatWindowCloseIcon
 		int iy = y + ((height - iwh) / 2);
 		int ix2 = ix + iwh - 1;
 		int iy2 = iy + iwh - 1;
-		float thickness = SystemInfo.isWindows_11_orLater ? (float) scaleFactor : (int) scaleFactor;
+		float thickness = Math.max( SystemInfo.isWindows_11_orLater ? (float) scaleFactor : (int) scaleFactor, 1 );
 
 		Path2D path = new Path2D.Float( Path2D.WIND_EVEN_ODD, 4 );
 		path.moveTo( ix, iy );

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

@@ -38,7 +38,7 @@ public class FlatWindowIconifyIcon
 	@Override
 	protected void paintIconAt1x( Graphics2D g, int x, int y, int width, int height, double scaleFactor ) {
 		int iw = (int) (getSymbolHeight() * scaleFactor);
-		int ih = (int) scaleFactor;
+		int ih = Math.max( (int) scaleFactor, 1 );
 		int ix = x + ((width - iw) / 2);
 		int iy = y + ((height - ih) / 2);
 

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

@@ -42,7 +42,7 @@ public class FlatWindowMaximizeIcon
 		int iwh = (int) (getSymbolHeight() * scaleFactor);
 		int ix = x + ((width - iwh) / 2);
 		int iy = y + ((height - iwh) / 2);
-		float thickness = SystemInfo.isWindows_11_orLater ? (float) scaleFactor : (int) scaleFactor;
+		float thickness = Math.max( SystemInfo.isWindows_11_orLater ? (float) scaleFactor : (int) scaleFactor, 1 );
 		int arc = Math.max( (int) (1.5 * scaleFactor), 2 );
 
 		g.fill( SystemInfo.isWindows_11_orLater

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

@@ -45,7 +45,7 @@ public class FlatWindowRestoreIcon
 		int iwh = (int) (getSymbolHeight() * scaleFactor);
 		int ix = x + ((width - iwh) / 2);
 		int iy = y + ((height - iwh) / 2);
-		float thickness = SystemInfo.isWindows_11_orLater ? (float) scaleFactor : (int) scaleFactor;
+		float thickness = Math.max( SystemInfo.isWindows_11_orLater ? (float) scaleFactor : (int) scaleFactor, 1 );
 		int arc = Math.max( (int) (1.5 * scaleFactor), 2 );
 		int arcOuter = (int) (arc + (1.5 * scaleFactor));
 

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

@@ -653,7 +653,8 @@ public class FlatButtonUI
 	}
 
 	protected Color getBackground( JComponent c ) {
-		boolean toolBarButton = isToolBarButton( c ) || isBorderlessButton( c );
+		boolean def = isDefaultButton( c );
+		boolean toolBarButton = !def && (isToolBarButton( c ) || isBorderlessButton( c ));
 
 		// selected state
 		if( ((AbstractButton)c).isSelected() ) {
@@ -681,7 +682,6 @@ public class FlatButtonUI
 				toolbarPressedBackground );
 		}
 
-		boolean def = isDefaultButton( c );
 		return buttonStateColor( c,
 			getBackgroundBase( c, def ),
 			disabledBackground,
@@ -733,7 +733,8 @@ public class FlatButtonUI
 
 	protected Color getForeground( JComponent c ) {
 		Color fg = c.getForeground();
-		boolean toolBarButton = isToolBarButton( c ) || isBorderlessButton( c );
+		boolean def = isDefaultButton( c );
+		boolean toolBarButton = !def && (isToolBarButton( c ) || isBorderlessButton( c ));
 
 		// selected state
 		if( ((AbstractButton)c).isSelected() ) {
@@ -759,7 +760,6 @@ public class FlatButtonUI
 				toolbarPressedForeground );
 		}
 
-		boolean def = isDefaultButton( c );
 		return buttonStateColor( c,
 			getForegroundBase( c, def ),
 			disabledText,

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

@@ -74,7 +74,7 @@ public class FlatDropShadowBorder
 
 		this.shadowColor = shadowColor;
 		this.shadowInsets = shadowInsets;
-		this.shadowOpacity = shadowOpacity;
+		this.shadowOpacity = Math.min( Math.max( shadowOpacity, 0f ), 1f );
 
 		shadowSize = maxInset( shadowInsets );
 	}

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

@@ -376,31 +376,68 @@ public class FlatFileChooserUI
 			if( icon != null )
 				return icon;
 
-			// get system icon
+			// new proxy icon
-			if( f != null ) {
+			//
-				try {
+			// Note: Since this is a super light weight icon object, we do not add it
-					icon = getFileChooser().getFileSystemView().getSystemIcon( f );
+			//       to the icon cache here. This keeps cache small in case of large directories
-				} catch( NullPointerException ex ) {
+			//       with thousands of files when icons of all files are only needed to compute
-					// Java 21 may throw a NPE for exe files that use default Windows exe icon
+			//       the layout of list/table, but never painted because located outside of visible area.
-				}
+			//       When an icon needs to be painted, the proxy adds it to the icon cache
+			//       and loads the real icon.
+			return new FlatFileViewIcon( f );
+		}
 
-				if( icon != null ) {
+		//---- class FlatFileViewIcon -----------------------------------------
-					if( icon instanceof ImageIcon )
+
-						icon = new ScaledImageIcon( (ImageIcon) icon );
+		/**
-					cacheIcon( f, icon );
+		 * A proxy icon that has a fixed (scaled) width/height (16x16) and
-					return icon;
+		 * gets/loads the real (system) icon only for painting.
-				}
+		 * Avoids unnecessary getting/loading system icons.
+		 */
+		private class FlatFileViewIcon
+			implements Icon
+		{
+			private final File f;
+			private Icon realIcon;
+
+			FlatFileViewIcon( File f ) {
+				this.f = f;
 			}
 
-			// get default icon
+			@Override
-			icon = super.getIcon( f );
+			public int getIconWidth() {
-
+				return UIScale.scale( 16 );
-			if( icon instanceof ImageIcon ) {
-				icon = new ScaledImageIcon( (ImageIcon) icon );
-				cacheIcon( f, icon );
 			}
 
-			return icon;
+			@Override
+			public int getIconHeight() {
+				return UIScale.scale( 16 );
+			}
+
+			@Override
+			public void paintIcon( Component c, Graphics g, int x, int y ) {
+				// get icon on demand
+				if( realIcon == null ) {
+					// get system icon
+					try {
+						if( f != null )
+							realIcon = getFileChooser().getFileSystemView().getSystemIcon( f );
+					} catch( NullPointerException ex ) {
+						// Java 21 may throw a NPE for exe files that use default Windows exe icon
+					}
+
+					// get default icon
+					if( realIcon == null )
+						realIcon = FlatFileView.super.getIcon( f );
+
+					if( realIcon instanceof ImageIcon )
+						realIcon = new ScaledImageIcon( (ImageIcon) realIcon );
+
+					cacheIcon( f, this );
+				}
+
+				realIcon.paintIcon( c, g, x, y );
+			}
 		}
 	}
 

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

@@ -17,6 +17,7 @@
 package com.formdev.flatlaf.ui;
 
 import java.awt.Color;
+import java.awt.Font;
 import java.beans.PropertyChangeEvent;
 import java.beans.PropertyChangeListener;
 import java.util.Arrays;
@@ -74,9 +75,9 @@ public class FlatHTML
 		for( int i = 1; i <= 7; i++ )
 			System.out.println( i+": "+ styleSheet.getPointSize( i ) );
 debug*/
-		int fontBaseSize = c.getFont().getSize();
+		Font font = c.getFont();
 		if( styleSheet.getPointSize( 7 ) != 36f ||
-			styleSheet.getPointSize( 4 ) == fontBaseSize )
+			font == null || styleSheet.getPointSize( 4 ) == font.getSize() )
 		  return;
 
 		// check whether view uses "absolute-size" keywords (e.g. "x-large") for font-size
@@ -97,7 +98,7 @@ debug*/
 			return;
 
 		// BASE_SIZE rule is parsed in javax.swing.text.html.StyleSheet.addRule()
-		String style = "<style>BASE_SIZE " + c.getFont().getSize() + "</style>";
+		String style = "<style>BASE_SIZE " + font.getSize() + "</style>";
 		String openTag = "";
 		String closeTag = "";
 

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

@@ -57,6 +57,7 @@ import com.formdev.flatlaf.util.UIScale;
  * @uiDefault List.foreground						Color
  * @uiDefault List.selectionBackground				Color
  * @uiDefault List.selectionForeground				Color
+ * @uiDefault List.alternateRowColor				Color
  * @uiDefault List.dropLineColor					Color
  * @uiDefault List.border							Border
  * @uiDefault List.cellRenderer						ListCellRenderer
@@ -93,6 +94,7 @@ public class FlatListUI
 	@Styleable protected Color selectionForeground;
 	@Styleable protected Color selectionInactiveBackground;
 	@Styleable protected Color selectionInactiveForeground;
+	/** @since 3.6 */ @Styleable protected Color alternateRowColor;
 	/** @since 3 */ @Styleable protected Insets selectionInsets;
 	/** @since 3 */ @Styleable protected int selectionArc;
 
@@ -129,6 +131,7 @@ public class FlatListUI
 		selectionForeground = UIManager.getColor( "List.selectionForeground" );
 		selectionInactiveBackground = UIManager.getColor( "List.selectionInactiveBackground" );
 		selectionInactiveForeground = UIManager.getColor( "List.selectionInactiveForeground" );
+		alternateRowColor = UIManager.getColor( "List.alternateRowColor" );
 		selectionInsets = UIManager.getInsets( "List.selectionInsets" );
 		selectionArc = UIManager.getInt( "List.selectionArc" );
 
@@ -143,6 +146,7 @@ public class FlatListUI
 		selectionForeground = null;
 		selectionInactiveBackground = null;
 		selectionInactiveForeground = null;
+		alternateRowColor = null;
 
 		oldStyleValues = null;
 	}
@@ -299,13 +303,24 @@ public class FlatListUI
 	{
 		boolean isSelected = selModel.isSelectedIndex( row );
 
+		// paint alternating rows
+		if( alternateRowColor != null && row % 2 != 0 &&
+			!"ComboBox.list".equals( list.getName() ) ) // combobox does not support alternate row color
+		{
+			g.setColor( alternateRowColor );
+
+			float arc = UIScale.scale( selectionArc / 2f );
+			FlatUIUtils.paintSelection( (Graphics2D) g, rowBounds.x, rowBounds.y, rowBounds.width, rowBounds.height,
+				UIScale.scale( selectionInsets ), arc, arc, arc, arc, 0 );
+		}
+
 		// get renderer component
 		@SuppressWarnings( "unchecked" )
 		Component rendererComponent = cellRenderer.getListCellRendererComponent( list,
 			dataModel.getElementAt( row ), row, isSelected,
 			FlatUIUtils.isPermanentFocusOwner( list ) && (row == leadIndex) );
 
-		//
+		// use smaller cell width if list is used in JFileChooser
 		boolean isFileList = Boolean.TRUE.equals( list.getClientProperty( "List.isFileList" ) );
 		int cx, cw;
 		if( isFileList ) {

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

@@ -90,10 +90,10 @@ class FlatNativeLibrary
 			classifier = SystemInfo.isAARCH64 ? "macos-arm64" : "macos-x86_64";
 			ext = "dylib";
 
-		} else if( SystemInfo.isLinux && SystemInfo.isX86_64 ) {
+		} else if( SystemInfo.isLinux && (SystemInfo.isX86_64 || SystemInfo.isAARCH64)) {
-			// Linux: requires x86_64
+			// Linux: requires x86_64 or aarch64
 
-			classifier = "linux-x86_64";
+			classifier = SystemInfo.isAARCH64 ? "linux-arm64" : "linux-x86_64";
 			ext = "so";
 
 			// Load libjawt.so (part of JRE) explicitly because it is not found

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

@@ -25,6 +25,7 @@ import java.awt.Dimension;
 import java.awt.EventQueue;
 import java.awt.GraphicsConfiguration;
 import java.awt.GraphicsDevice;
+import java.awt.GraphicsDevice.WindowTranslucency;
 import java.awt.GraphicsEnvironment;
 import java.awt.Insets;
 import java.awt.MouseInfo;
@@ -117,8 +118,8 @@ public class FlatPopupFactory
 		// macOS and Linux adds drop shadow to heavy weight popups
 		if( SystemInfo.isMacOS || SystemInfo.isLinux ) {
 			NonFlashingPopup popup = new NonFlashingPopup( getPopupForScreenOfOwner( owner, contents, x, y, true ), owner, contents );
-			if( popup.popupWindow != null && isMacOSBorderSupported() )
+			if( popup.popupWindow != null && (isMacOSBorderSupported() || isLinuxBorderSupported( popup.popupWindow )) )
-				setupRoundedBorder( popup.popupWindow, owner, contents );
+				setupRoundedBorder( popup, popup.popupWindow, owner, contents );
 			return popup;
 		}
 
@@ -128,7 +129,7 @@ public class FlatPopupFactory
 		{
 			NonFlashingPopup popup = new NonFlashingPopup( getPopupForScreenOfOwner( owner, contents, x, y, true ), owner, contents );
 			if( popup.popupWindow != null )
-				setupRoundedBorder( popup.popupWindow, owner, contents );
+				setupRoundedBorder( popup, popup.popupWindow, owner, contents );
 			return popup;
 		}
 
@@ -138,7 +139,7 @@ public class FlatPopupFactory
 
 		// create drop shadow popup
 		Popup popupForScreenOfOwner = getPopupForScreenOfOwner( owner, contents, x, y, forceHeavyWeight );
-		GraphicsConfiguration gc = owner.getGraphicsConfiguration();
+		GraphicsConfiguration gc = (owner != null) ? owner.getGraphicsConfiguration() : null;
 		return (gc != null && gc.isTranslucencyCapable())
 			? new DropShadowPopup( popupForScreenOfOwner, owner, contents )
 			: new NonFlashingPopup( popupForScreenOfOwner, owner, contents );
@@ -306,7 +307,7 @@ public class FlatPopupFactory
 				break;
 			}
 		}
-		if( gc == null )
+		if( gc == null && owner != null )
 			gc = owner.getGraphicsConfiguration();
 		if( gc == null )
 			return null;
@@ -365,18 +366,20 @@ public class FlatPopupFactory
 	}
 
 	private static boolean isMacOSBorderSupported() {
-		// do not use rounded border on macOS 14.4+ because it may freeze the application
-		// and crash the macOS WindowServer process (reports vary from Finder restarts to OS restarts)
-		// https://github.com/apache/netbeans/issues/7560#issuecomment-2226439215
-		// https://github.com/apache/netbeans/issues/6647#issuecomment-2070124442
-		boolean isMacOS_14_4_orLater = (SystemInfo.osVersion >= SystemInfo.toVersion( 14, 4, 0, 0 ));
-
 		return SystemInfo.isMacOS &&
-			FlatSystemProperties.getBoolean( FlatSystemProperties.USE_ROUNDED_POPUP_BORDER, !isMacOS_14_4_orLater ) &&
+			FlatSystemProperties.getBoolean( FlatSystemProperties.USE_ROUNDED_POPUP_BORDER, true ) &&
 			FlatNativeMacLibrary.isLoaded();
 	}
 
-	private static void setupRoundedBorder( Window popupWindow, Component owner, Component contents ) {
+	private static boolean isLinuxBorderSupported( Window window ) {
+		return SystemInfo.isLinux &&
+			FlatSystemProperties.getBoolean( FlatSystemProperties.USE_ROUNDED_POPUP_BORDER, true ) &&
+			window.getGraphicsConfiguration().getDevice().isWindowTranslucencySupported( WindowTranslucency.PERPIXEL_TRANSPARENT );
+	}
+
+	private static void setupRoundedBorder( NonFlashingPopup popup,
+		Window popupWindow, Component owner, Component contents )
+	{
 		int borderCornerRadius = getBorderCornerRadius( owner, contents );
 		float borderWidth = getRoundedBorderWidth( owner, contents );
 
@@ -403,7 +406,7 @@ public class FlatPopupFactory
 
 		if( popupWindow.isDisplayable() ) {
 			// native window already created
-			setupRoundedBorderImpl( popupWindow, borderCornerRadius, borderWidth, borderColor );
+			setupRoundedBorderImpl( popup, popupWindow, borderCornerRadius, borderWidth, borderColor );
 		} else {
 			// native window not yet created --> add listener to set native border after window creation
 			AtomicReference<HierarchyListener> l = new AtomicReference<>();
@@ -411,7 +414,7 @@ public class FlatPopupFactory
 				if( e.getID() == HierarchyEvent.HIERARCHY_CHANGED &&
 					(e.getChangeFlags() & HierarchyEvent.DISPLAYABILITY_CHANGED) != 0 )
 				{
-					setupRoundedBorderImpl( popupWindow, borderCornerRadius, borderWidth, borderColor );
+					setupRoundedBorderImpl( popup, popupWindow, borderCornerRadius, borderWidth, borderColor );
 					popupWindow.removeHierarchyListener( l.get() );
 				}
 			} );
@@ -419,7 +422,9 @@ public class FlatPopupFactory
 		}
 	}
 
-	private static void setupRoundedBorderImpl( Window popupWindow, int borderCornerRadius, float borderWidth, Color borderColor ) {
+	private static void setupRoundedBorderImpl( NonFlashingPopup popup,
+		Window popupWindow, int borderCornerRadius, float borderWidth, Color borderColor )
+	{
 		if( SystemInfo.isWindows ) {
 			// get native window handle
 			long hwnd = FlatNativeWindowsLibrary.getHWND( popupWindow );
@@ -439,6 +444,12 @@ public class FlatPopupFactory
 			// set corner radius, border width and color
 			FlatNativeMacLibrary.setWindowRoundedBorder( popupWindow, borderCornerRadius,
 				borderWidth, (borderColor != null) ? borderColor.getRGB() : 0 );
+		} else if( SystemInfo.isLinux ) {
+			if( popupWindow instanceof RootPaneContainer ) {
+				popup.windowRoundedBorder = new FlatWindowRoundedBorder(
+					((RootPaneContainer)popupWindow).getRootPane(),
+					borderCornerRadius, borderWidth, borderColor );
+			}
 		}
 	}
 
@@ -471,7 +482,7 @@ public class FlatPopupFactory
 			"Popup.roundedBorderWidth";
 
 		Object value = getOption( owner, contents, FlatClientProperties.POPUP_ROUNDED_BORDER_WIDTH, uiKey );
-		return (value instanceof Number) ? ((Number)value).floatValue() : 0;
+		return (value instanceof Number) ? ((Number)value).floatValue() : 1;
 	}
 
 	//---- fixes --------------------------------------------------------------
@@ -584,6 +595,7 @@ public class FlatPopupFactory
 		// heavy weight
 		Window popupWindow;
 		private Color oldPopupWindowBackground;
+		private FlatWindowRoundedBorder windowRoundedBorder;
 
 		private boolean disposed;
 
@@ -609,6 +621,7 @@ public class FlatPopupFactory
 			contents = reusePopup.contents;
 			popupWindow = reusePopup.popupWindow;
 			oldPopupWindowBackground = reusePopup.oldPopupWindowBackground;
+			windowRoundedBorder = reusePopup.windowRoundedBorder;
 		}
 
 		NonFlashingPopup cloneForReuse() {
@@ -680,6 +693,11 @@ public class FlatPopupFactory
 				contents = null;
 			}
 
+			if( windowRoundedBorder != null ) {
+				windowRoundedBorder.uninstall();
+				windowRoundedBorder = null;
+			}
+
 			if( popupWindow != null ) {
 				// restore background so that it can not affect other LaFs (when switching)
 				// because popup windows are cached and reused
@@ -715,6 +733,7 @@ public class FlatPopupFactory
 
 	private class DropShadowPopup
 		extends NonFlashingPopup
+		implements ComponentListener
 	{
 		// light weight
 		private JComponent lightComp;
@@ -774,7 +793,7 @@ public class FlatPopupFactory
 				}
 
 				// Windows 11: reset corner preference on reused heavy weight popups
-				if( isWindows11BorderSupported() ) {
+				if( SystemInfo.isWindows_11_orLater && FlatNativeWindowsLibrary.isLoaded() ) {
 					resetWindows11Border( popupWindow );
 					if( dropShadowWindow != null )
 						resetWindows11Border( dropShadowWindow );
@@ -844,10 +863,18 @@ public class FlatPopupFactory
 				if( insets.left != 0 || insets.top != 0 )
 					lightComp.setLocation( lightComp.getX() - insets.left, lightComp.getY() - insets.top );
 			}
+
+			if( popupWindow != null ) {
+				removeAllPopupWindowComponentListeners();
+				popupWindow.addComponentListener( this );
+			}
 		}
 
 		@Override
 		void hideImpl() {
+			if( popupWindow != null )
+				removeAllPopupWindowComponentListeners();
+
 			if( dropShadowDelegate != null ) {
 				dropShadowDelegate.hide();
 				dropShadowDelegate = null;
@@ -947,23 +974,55 @@ public class FlatPopupFactory
 
 		@Override
 		void reset( Component contents, int ownerX, int ownerY ) {
+			if( popupWindow != null )
+				removeAllPopupWindowComponentListeners();
+
 			super.reset( contents, ownerX, ownerY );
 
-			if( dropShadowWindow != null ) {
+			updateDropShadowWindowBounds();
-				// set preferred size of drop shadow panel
+		}
-				Dimension prefSize = popupWindow.getPreferredSize();
-				Insets insets = dropShadowPanel2.getInsets();
-				int w = prefSize.width + insets.left + insets.right;
-				int h = prefSize.height + insets.top + insets.bottom;
-				dropShadowPanel2.setPreferredSize( new Dimension( w, h ) );
-				dropShadowPanel2.invalidate();
-				dropShadowWindow.pack();
 
-				// update drop shadow popup window location
+		private void updateDropShadowWindowBounds() {
-				int x = popupWindow.getX() - insets.left;
+			if( dropShadowWindow == null )
-				int y = popupWindow.getY() - insets.top;
+				return;
-				dropShadowWindow.setLocation( x, y );
+
+			// calculate size of drop shadow window
+			Dimension size = popupWindow.getSize();
+			Insets insets = dropShadowPanel2.getInsets();
+			int w = size.width + insets.left + insets.right;
+			int h = size.height + insets.top + insets.bottom;
+
+			// update drop shadow popup window bounds
+			int x = popupWindow.getX() - insets.left;
+			int y = popupWindow.getY() - insets.top;
+			dropShadowWindow.setBounds( x, y, w, h );
+			dropShadowWindow.validate();
+		}
+
+		private void removeAllPopupWindowComponentListeners() {
+			// make sure that there is no old component listener
+			// necessary because this class is cloned if reusing popup windows
+			for( ComponentListener l : popupWindow.getComponentListeners() ) {
+				if( l instanceof DropShadowPopup )
+					popupWindow.removeComponentListener( l );
 			}
 		}
+
+		//---- interface ComponentListener ----
+
+		@Override
+		public void componentResized( ComponentEvent e ) {
+			if( e.getSource() == popupWindow )
+				updateDropShadowWindowBounds();
+		}
+
+		@Override
+		public void componentMoved( ComponentEvent e ) {
+			if( e.getSource() == popupWindow )
+				updateDropShadowWindowBounds();
+		}
+
+		@Override public void componentShown( ComponentEvent e ) {}
+		@Override public void componentHidden( ComponentEvent e ) {}
 	}
 }

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

@@ -684,7 +684,7 @@ public class FlatRootPaneUI
 	 * Window border used for non-native window decorations.
 	 */
 	public static class FlatWindowBorder
-		extends BorderUIResource.EmptyBorderUIResource
+		extends FlatEmptyBorder
 	{
 		protected final Color activeBorderColor = UIManager.getColor( "RootPane.activeBorderColor" );
 		protected final Color inactiveBorderColor = UIManager.getColor( "RootPane.inactiveBorderColor" );
@@ -717,7 +717,10 @@ public class FlatRootPaneUI
 		}
 
 		private void paintImpl( Graphics2D g, int x, int y, int width, int height, double scaleFactor ) {
-			g.drawRect( x, y, width - 1, height - 1 );
+			Object[] oldRenderingHints = FlatUIUtils.setRenderingHints( g );
+			float lineWidth = (float) (UIScale.scale( 1f ) * scaleFactor);
+			g.fill( FlatUIUtils.createRectangle( x, y, width, height, lineWidth ) );
+			FlatUIUtils.resetRenderingHints( g, oldRenderingHints );
 		}
 
 		protected boolean isWindowMaximized( Component c ) {

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

@@ -102,9 +102,11 @@ import com.formdev.flatlaf.util.UIScale;
  * @uiDefault Tree.selectionForeground				Color
  * @uiDefault Tree.selectionInactiveBackground		Color
  * @uiDefault Tree.selectionInactiveForeground		Color
+ * @uiDefault Tree.alternateRowColor				Color
  * @uiDefault Tree.selectionInsets					Insets
  * @uiDefault Tree.selectionArc						int
  * @uiDefault Tree.wideSelection					boolean
+ * @uiDefault Tree.wideCellRenderer					boolean
  * @uiDefault Tree.showCellFocusIndicator			boolean
  * @uiDefault Tree.showDefaultIcons					boolean
  *
@@ -141,9 +143,11 @@ public class FlatTreeUI
 	@Styleable protected Color selectionInactiveBackground;
 	@Styleable protected Color selectionInactiveForeground;
 	@Styleable protected Color selectionBorderColor;
+	/** @since 3.6 */ @Styleable protected Color alternateRowColor;
 	/** @since 3 */ @Styleable protected Insets selectionInsets;
 	/** @since 3 */ @Styleable protected int selectionArc;
 	@Styleable protected boolean wideSelection;
+	/** @since 3.6 */ @Styleable protected boolean wideCellRenderer;
 	@Styleable protected boolean showCellFocusIndicator;
 	/** @since 3 */ protected boolean showDefaultIcons;
 
@@ -192,9 +196,11 @@ public class FlatTreeUI
 		selectionInactiveBackground = UIManager.getColor( "Tree.selectionInactiveBackground" );
 		selectionInactiveForeground = UIManager.getColor( "Tree.selectionInactiveForeground" );
 		selectionBorderColor = UIManager.getColor( "Tree.selectionBorderColor" );
+		alternateRowColor = UIManager.getColor( "Tree.alternateRowColor" );
 		selectionInsets = UIManager.getInsets( "Tree.selectionInsets" );
 		selectionArc = UIManager.getInt( "Tree.selectionArc" );
 		wideSelection = UIManager.getBoolean( "Tree.wideSelection" );
+		wideCellRenderer = UIManager.getBoolean( "Tree.wideCellRenderer" );
 		showCellFocusIndicator = UIManager.getBoolean( "Tree.showCellFocusIndicator" );
 		showDefaultIcons = UIManager.getBoolean( "Tree.showDefaultIcons" );
 
@@ -227,6 +233,7 @@ public class FlatTreeUI
 		selectionInactiveBackground = null;
 		selectionInactiveForeground = null;
 		selectionBorderColor = null;
+		alternateRowColor = null;
 
 		defaultLeafIcon = null;
 		defaultClosedIcon = null;
@@ -310,6 +317,7 @@ public class FlatTreeUI
 			if( e.getSource() == tree ) {
 				switch( e.getPropertyName() ) {
 					case TREE_WIDE_SELECTION:
+					case TREE_WIDE_CELL_RENDERER:
 					case TREE_PAINT_SELECTION:
 						HiDPIUtils.repaint( tree );
 						break;
@@ -571,6 +579,27 @@ public class FlatTreeUI
 		boolean isDropRow = isDropRow( row );
 		boolean needsSelectionPainting = (isSelected || isDropRow) && isPaintSelection();
 
+		// paint alternating rows
+		if( alternateRowColor != null && row % 2 != 0 ) {
+			g.setColor( alternateRowColor );
+
+			float arc = UIScale.scale( selectionArc / 2f );
+			FlatUIUtils.paintSelection( (Graphics2D) g, 0, bounds.y, tree.getWidth(), bounds.height,
+				UIScale.scale( selectionInsets ), arc, arc, arc, arc, 0 );
+		}
+
+		// update bounds for wide cell renderer
+		if( isWideSelection() && isWideCellRenderer() ) {
+			Rectangle wideBounds = new Rectangle( bounds );
+			if( tree.getComponentOrientation().isLeftToRight() )
+				wideBounds.width = tree.getWidth() - bounds.x - insets.right;
+			else {
+				wideBounds.x = insets.left;
+				wideBounds.width = bounds.x + bounds.width - insets.left;
+			}
+			bounds = wideBounds;
+		}
+
 		// do not paint row if editing
 		if( isEditing ) {
 			// paint wide selection
@@ -795,6 +824,11 @@ public class FlatTreeUI
 		return clientPropertyBoolean( tree, TREE_WIDE_SELECTION, wideSelection );
 	}
 
+	/** @since 3.6 */
+	protected boolean isWideCellRenderer() {
+		return clientPropertyBoolean( tree, TREE_WIDE_CELL_RENDERER, wideCellRenderer );
+	}
+
 	protected boolean isPaintSelection() {
 		return clientPropertyBoolean( tree, TREE_PAINT_SELECTION, paintSelection );
 	}

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

@@ -129,6 +129,20 @@ public class FlatUIUtils
 		return insets.top == 0 && insets.left == 0 && insets.bottom == 0 && insets.right == 0;
 	}
 
+	/** @since 3.6 */
+	public static Color stateColor( boolean state, Color stateColor, Color defaultColor ) {
+		return (state && stateColor != null) ? stateColor : defaultColor;
+	}
+
+	/** @since 3.6 */
+	public static Color stateColor( boolean state1, Color state1Color,
+		boolean state2, Color state2Color, Color defaultColor )
+	{
+		return (state1 && state1Color != null)
+			? state1Color
+			: ((state2 && state2Color != null) ? state2Color : defaultColor);
+	}
+
 	public static Color getUIColor( String key, int defaultColorRGB ) {
 		Color color = UIManager.getColor( key );
 		return (color != null) ? color : new Color( defaultColorRGB );
@@ -397,7 +411,8 @@ public class FlatUIUtils
 		GraphicsConfiguration gc = c.getGraphicsConfiguration();
 		GraphicsDevice gd = (gc != null) ? gc.getDevice() : null;
 		Window fullScreenWindow = (gd != null) ? gd.getFullScreenWindow() : null;
-		return (fullScreenWindow != null && fullScreenWindow == SwingUtilities.windowForComponent( c ));
+		return (fullScreenWindow != null &&
+			(fullScreenWindow == c || fullScreenWindow == SwingUtilities.windowForComponent( c )));
 	}
 
 	public static Boolean isRoundRect( Component c ) {

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

@@ -41,7 +41,6 @@ import java.util.function.Supplier;
 import javax.swing.DesktopManager;
 import javax.swing.JComponent;
 import javax.swing.JInternalFrame;
-import javax.swing.JLayeredPane;
 import javax.swing.JPanel;
 import javax.swing.JRootPane;
 import javax.swing.SwingUtilities;
@@ -60,8 +59,6 @@ import com.formdev.flatlaf.util.UIScale;
 public abstract class FlatWindowResizer
 	implements PropertyChangeListener, ComponentListener
 {
-	protected final static Integer WINDOW_RESIZER_LAYER = JLayeredPane.DRAG_LAYER + 1;
-
 	protected final JComponent resizeComp;
 
 	protected final int borderDragThickness = FlatUIUtils.getUIInt( "RootPane.borderDragThickness", 5 );
@@ -82,12 +79,12 @@ public abstract class FlatWindowResizer
 		leftDragComp = createDragBorderComponent( NW_RESIZE_CURSOR, W_RESIZE_CURSOR, SW_RESIZE_CURSOR );
 		rightDragComp = createDragBorderComponent( NE_RESIZE_CURSOR, E_RESIZE_CURSOR, SE_RESIZE_CURSOR );
 
-		Container cont = (resizeComp instanceof JRootPane) ? ((JRootPane)resizeComp).getLayeredPane() : resizeComp;
+		// for rootpanes, add after glasspane
-		Object cons = (cont instanceof JLayeredPane) ? WINDOW_RESIZER_LAYER : null;
+		int insertIndex = (resizeComp instanceof JRootPane) ? 1 : 0;
-		cont.add( topDragComp, cons, 0 );
+		resizeComp.add( topDragComp,    insertIndex++ );
-		cont.add( bottomDragComp, cons, 1 );
+		resizeComp.add( bottomDragComp, insertIndex++ );
-		cont.add( leftDragComp, cons, 2 );
+		resizeComp.add( leftDragComp,   insertIndex++ );
-		cont.add( rightDragComp, cons, 3 );
+		resizeComp.add( rightDragComp,  insertIndex++ );
 
 		resizeComp.addComponentListener( this );
 		resizeComp.addPropertyChangeListener( "ancestor", this );
@@ -106,11 +103,10 @@ public abstract class FlatWindowResizer
 		resizeComp.removeComponentListener( this );
 		resizeComp.removePropertyChangeListener( "ancestor", this );
 
-		Container cont = topDragComp.getParent();
+		resizeComp.remove( topDragComp );
-		cont.remove( topDragComp );
+		resizeComp.remove( bottomDragComp );
-		cont.remove( bottomDragComp );
+		resizeComp.remove( leftDragComp );
-		cont.remove( leftDragComp );
+		resizeComp.remove( rightDragComp );
-		cont.remove( rightDragComp );
 	}
 
 	public void doLayout() {
@@ -121,7 +117,7 @@ public abstract class FlatWindowResizer
 		int y = 0;
 		int width = resizeComp.getWidth();
 		int height = resizeComp.getHeight();
-		if( width == 0 || height == 0 )
+		if( width <= 0 || height <= 0 )
 			return;
 
 		Insets resizeInsets = getResizeInsets();
@@ -251,8 +247,7 @@ public abstract class FlatWindowResizer
 			centerComp = new JPanel();
 			centerComp.setOpaque( false );
 			centerComp.setVisible( false );
-			Container cont = rootPane.getLayeredPane();
+			rootPane.add( centerComp, 5 );
-			cont.add( centerComp, WINDOW_RESIZER_LAYER, 4 );
 
 			// On Linux, limit window resizing to screen bounds because otherwise
 			// there would be a strange effect when the mouse is moved over a sidebar
@@ -262,8 +257,7 @@ public abstract class FlatWindowResizer
 
 		@Override
 		public void uninstall() {
-			Container cont = topDragComp.getParent();
+			resizeComp.remove( centerComp );
-			cont.remove( centerComp );
 
 			super.uninstall();
 		}
@@ -272,7 +266,8 @@ public abstract class FlatWindowResizer
 		public void doLayout() {
 			super.doLayout();
 
-			centerComp.setBounds( 0, 0, resizeComp.getWidth(), resizeComp.getHeight() );
+			if( centerComp != null && centerComp.isVisible() )
+				centerComp.setBounds( 0, 0, resizeComp.getWidth(), resizeComp.getHeight() );
 		}
 
 		@Override
@@ -376,6 +371,7 @@ public abstract class FlatWindowResizer
 
 		@Override
 		protected void beginResizing( int resizeDir ) {
+			centerComp.setBounds( 0, 0, resizeComp.getWidth(), resizeComp.getHeight() );
 			centerComp.setCursor( getPredefinedCursor( resizeDir ) );
 			centerComp.setVisible( true );
 		}

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

@@ -0,0 +1,361 @@
+/*
+ * Copyright 2025 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.ui;
+
+import static javax.swing.SwingConstants.*;
+import java.awt.Color;
+import java.awt.Container;
+import java.awt.Frame;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.IllegalComponentStateException;
+import java.awt.Shape;
+import java.awt.Window;
+import java.awt.event.ComponentEvent;
+import java.awt.event.ComponentListener;
+import java.awt.geom.Area;
+import java.awt.geom.Path2D;
+import java.awt.geom.Rectangle2D;
+import java.awt.geom.RoundRectangle2D;
+import java.beans.PropertyChangeEvent;
+import java.beans.PropertyChangeListener;
+import javax.swing.JComponent;
+import javax.swing.JLayeredPane;
+import javax.swing.JRootPane;
+import com.formdev.flatlaf.util.UIScale;
+
+/**
+ * Rounded border for {@link Window}.
+ * Used for popups and for FlatLaf window decorations.
+ * <p>
+ * Border is painted only if window is not maximized (in both directions) and
+ * not in full screen mode. If maximized in one direction (vertically or horizontally),
+ * then a square border is painted.
+ * <p>
+ * Note: The rootpane of the window should have a {@link FlatEmptyBorder} with
+ *       same insets as border width used in this class.
+ *
+ * @author Karl Tauber
+ * @since 3.6
+ */
+public class FlatWindowRoundedBorder
+	implements PropertyChangeListener, ComponentListener
+{
+	protected final JRootPane rootPane;
+	protected final int borderCornerRadius;
+	protected final float borderWidth;
+	protected final Color borderColor;
+
+	protected final Shape cornerShape;
+
+	// edges
+	protected final RoundedBorderComponent northComp;
+	protected final RoundedBorderComponent southComp;
+	protected final RoundedBorderComponent westComp;
+	protected final RoundedBorderComponent eastComp;
+
+	// corners
+	protected final RoundedBorderComponent northWestComp;
+	protected final RoundedBorderComponent northEastComp;
+	protected final RoundedBorderComponent southWestComp;
+	protected final RoundedBorderComponent southEastComp;
+
+	protected Window window;
+	protected boolean windowIsRounded;
+
+	public FlatWindowRoundedBorder( JRootPane rootPane, int borderCornerRadius,
+		float borderWidth, Color borderColor )
+	{
+		this.rootPane = rootPane;
+		this.borderCornerRadius = borderCornerRadius;
+		this.borderWidth = borderWidth;
+		this.borderColor = borderColor;
+
+		// create shape used to paint rounded corners
+		cornerShape = createCornerShape();
+
+		// create edges
+		northComp = new RoundedBorderComponent( NORTH );
+		southComp = new RoundedBorderComponent( SOUTH );
+		westComp  = new RoundedBorderComponent( WEST );
+		eastComp  = new RoundedBorderComponent( EAST );
+
+		// create corners
+		northWestComp = new RoundedBorderComponent( NORTH_WEST );
+		northEastComp = new RoundedBorderComponent( NORTH_EAST );
+		southWestComp = new RoundedBorderComponent( SOUTH_WEST );
+		southEastComp = new RoundedBorderComponent( SOUTH_EAST );
+
+		// insert before layered pane
+		int insertIndex = rootPane.getComponentCount() - 1;
+		JLayeredPane layeredPane = rootPane.getLayeredPane();
+		for( int i = insertIndex; i >= 0; i-- ) {
+			if( rootPane.getComponent( insertIndex ) == layeredPane )
+				break;
+		}
+
+		// add edges
+		rootPane.add( northComp, insertIndex++ );
+		rootPane.add( southComp, insertIndex++ );
+		rootPane.add( westComp,  insertIndex++ );
+		rootPane.add( eastComp,  insertIndex++ );
+
+		// add corners
+		rootPane.add( northWestComp, insertIndex++ );
+		rootPane.add( northEastComp, insertIndex++ );
+		rootPane.add( southWestComp, insertIndex++ );
+		rootPane.add( southEastComp, insertIndex++ );
+
+		// add listeners
+		rootPane.addComponentListener( this );
+		rootPane.addPropertyChangeListener( "ancestor", this );
+
+		if( rootPane.isDisplayable() )
+			addNotify();
+		else
+			updateVisibility();
+	}
+
+	public void uninstall() {
+		removeNotify();
+
+		// remove listeners
+		rootPane.removeComponentListener( this );
+		rootPane.removePropertyChangeListener( "ancestor", this );
+
+		// remove edges
+		rootPane.remove( northComp );
+		rootPane.remove( southComp );
+		rootPane.remove( westComp );
+		rootPane.remove( eastComp );
+
+		// remove corners
+		rootPane.remove( northWestComp );
+		rootPane.remove( northEastComp );
+		rootPane.remove( southWestComp );
+		rootPane.remove( southEastComp );
+	}
+
+	public void doLayout() {
+		if( !northComp.isVisible() )
+			return;
+
+		int x = 0;
+		int y = 0;
+		int width = rootPane.getWidth();
+		int height = rootPane.getHeight();
+		if( width <= 0 || height <= 0 )
+			return;
+
+		// for layout, round-up scaled border width and radius to ensure that components are large enough
+		int lineWidth = (int) Math.ceil( UIScale.scale( borderWidth ) );
+		int cornerSize = (windowIsRounded && lineWidth > 0)
+			? (int) Math.ceil( UIScale.scale( (float) borderCornerRadius ) )
+			: 0;
+		int cornerSize2x = cornerSize * 2;
+
+		// edges
+		northComp.setBounds( x + cornerSize, y, width - cornerSize2x, lineWidth );
+		southComp.setBounds( x + cornerSize, y + height - lineWidth, width - cornerSize2x, lineWidth );
+		westComp.setBounds( x, y + cornerSize, lineWidth, height - cornerSize2x );
+		eastComp.setBounds( x + width - lineWidth, y + cornerSize, lineWidth, height - cornerSize2x );
+
+		// corners
+		northWestComp.setBounds( x, y, cornerSize, cornerSize );
+		northEastComp.setBounds( x + width - cornerSize, y, cornerSize, cornerSize );
+		southWestComp.setBounds( x, y + height - cornerSize, cornerSize, cornerSize );
+		southEastComp.setBounds( x + width - cornerSize, y + height - cornerSize, cornerSize, cornerSize );
+	}
+
+	protected void addNotify() {
+		Container parent = rootPane.getParent();
+		window = (parent instanceof Window) ? (Window) parent : null;
+
+		updateVisibility();
+		updateWindowShape();
+		doLayout();
+	}
+
+	protected void removeNotify() {
+		if( window != null ) {
+			window.setShape( null );
+			window = null;
+		}
+
+		updateVisibility();
+	}
+
+	protected void updateVisibility() {
+		boolean visible = needsBorder();
+		if( visible == northComp.isVisible() )
+			return;
+
+		// edges
+		northComp.setVisible( visible );
+		southComp.setVisible( visible );
+		westComp.setVisible( visible );
+		eastComp.setVisible( visible );
+
+		// corners
+		northWestComp.setVisible( visible );
+		northEastComp.setVisible( visible );
+		southWestComp.setVisible( visible );
+		southEastComp.setVisible( visible );
+	}
+
+	protected boolean needsBorder() {
+		if( window == null || FlatUIUtils.isFullScreen( window ) )
+			return false;
+		if( window instanceof Frame )
+			return (((Frame)window).getExtendedState() & Frame.MAXIMIZED_BOTH) != Frame.MAXIMIZED_BOTH;
+		return true;
+	}
+
+	protected void updateWindowShape() {
+		windowIsRounded = false;
+
+		if( window == null )
+			return;
+
+		if( !northComp.isVisible() ||
+			(window instanceof Frame && (((Frame)window).getExtendedState() & Frame.MAXIMIZED_BOTH) != 0) )
+		{
+			window.setShape( null );
+			return;
+		}
+
+		int arc = UIScale.scale( borderCornerRadius * 2 );
+
+		// use a slightly smaller arc for the shape so that at least parts of
+		// the antialiased arc outside are shown
+		arc -= 2;
+
+		if( arc > 0 ) {
+			try {
+				window.setShape( new RoundRectangle2D.Float( 0, 0,
+					rootPane.getWidth(), rootPane.getHeight(), arc, arc ) );
+				windowIsRounded = true;
+			} catch( IllegalComponentStateException | UnsupportedOperationException ex ) {
+				window.setShape( null );
+			}
+		} else
+			window.setShape( null );
+	}
+
+	protected Shape createCornerShape() {
+		float lineWidth = UIScale.scale( borderWidth );
+		int arc = UIScale.scale( borderCornerRadius * 2 );
+		int wh = arc * 3;
+		float innerArc = arc - (lineWidth * 2);
+		float innerWH = wh - (lineWidth * 2);
+
+		Path2D path = new Path2D.Float( Path2D.WIND_EVEN_ODD );
+		path.append( new RoundRectangle2D.Float( 0, 0, wh, wh, arc, arc ), false );
+		path.append( new RoundRectangle2D.Float( lineWidth, lineWidth, innerWH, innerWH, innerArc, innerArc ), false );
+
+		Area area = new Area( path );
+		int cornerSize = (int) Math.ceil( UIScale.scale( (float) borderCornerRadius ) );
+		area.intersect( new Area( new Rectangle2D.Float( 0, 0, cornerSize, cornerSize ) ) );
+		return area;
+	}
+
+	//---- interface PropertyChangeListener ----
+
+	@Override
+	public void propertyChange( PropertyChangeEvent e ) {
+		switch( e.getPropertyName() ) {
+			case "ancestor":
+				if( e.getNewValue() != null )
+					addNotify();
+				else
+					removeNotify();
+				break;
+		}
+	}
+
+	//---- interface ComponentListener ----
+
+	@Override
+	public void componentResized( ComponentEvent e ) {
+		updateVisibility();
+		updateWindowShape();
+		doLayout();
+	}
+
+	@Override public void componentMoved( ComponentEvent e ) {}
+	@Override public void componentShown( ComponentEvent e ) {}
+	@Override public void componentHidden( ComponentEvent e ) {}
+
+	//---- class RoundedBorderComponent ---------------------------------------
+
+	protected class RoundedBorderComponent
+		extends JComponent
+	{
+		private final int position;
+
+		protected RoundedBorderComponent( int position ) {
+			this.position = position;
+		}
+
+		@Override
+		public void paint( Graphics g ) {
+			Graphics2D g2 = (Graphics2D) g;
+			int width = getWidth();
+			int height = getHeight();
+			float lineWidth = UIScale.scale( borderWidth );
+
+/*debug
+			g.setColor( java.awt.Color.green );
+			g.drawRect( 0, 0, width - 1, height - 1 );
+debug*/
+
+			Object[] oldRenderingHints = FlatUIUtils.setRenderingHints( g );
+
+			g.setColor( borderColor );
+			switch( position ) {
+				case NORTH: g2.fill( new Rectangle2D.Float( 0, 0, width, lineWidth ) ); break;
+				case SOUTH: g2.fill( new Rectangle2D.Float( 0, height - lineWidth, width, lineWidth ) ); break;
+				case WEST:  g2.fill( new Rectangle2D.Float( 0, 0, lineWidth, height ) ); break;
+				case EAST:  g2.fill( new Rectangle2D.Float( width - lineWidth, 0, lineWidth, height ) ); break;
+
+				case NORTH_WEST:
+					g2.fill( cornerShape );
+					break;
+
+				case NORTH_EAST:
+					g2.translate( width, 0 );
+					g2.rotate( Math.toRadians( 90 ) );
+					g2.fill( cornerShape );
+					break;
+
+				case SOUTH_WEST:
+					g2.translate( 0, height );
+					g2.rotate( Math.toRadians( -90 ) );
+					g2.fill( cornerShape );
+					break;
+
+				case SOUTH_EAST:
+					g2.translate( width, height );
+					g2.rotate( Math.toRadians( 180 ) );
+					g2.fill( cornerShape );
+					break;
+			}
+
+			FlatUIUtils.resetRenderingHints( g, oldRenderingHints );
+		}
+	}
+}

flatlaf-core/src/main/resources/com/formdev/flatlaf/FlatDarkLaf.properties

@@ -246,7 +246,6 @@ PasswordField.revealIconColor = @foreground
 
 #---- Popup ----
 
-[mac]Popup.roundedBorderWidth = 1
 Popup.dropShadowColor = #000
 Popup.dropShadowOpacity = 0.25
 

flatlaf-core/src/main/resources/com/formdev/flatlaf/FlatLaf.properties

@@ -289,7 +289,7 @@ ComboBox.popupInsets = 0,0,0,0
 ComboBox.selectionInsets = 0,0,0,0
 ComboBox.selectionArc = 0
 ComboBox.borderCornerRadius = $Popup.borderCornerRadius
-[mac]ComboBox.roundedBorderWidth = $Popup.roundedBorderWidth
+ComboBox.roundedBorderWidth = $Popup.roundedBorderWidth
 
 
 #---- Component ----
@@ -506,7 +506,7 @@ PasswordField.revealIcon = com.formdev.flatlaf.icons.FlatRevealIcon
 #---- Popup ----
 
 Popup.borderCornerRadius = 4
-[mac]Popup.roundedBorderWidth = 0
+Popup.roundedBorderWidth = 1
 Popup.dropShadowPainted = true
 Popup.dropShadowInsets = -4,-4,4,4
 
@@ -516,7 +516,7 @@ Popup.dropShadowInsets = -4,-4,4,4
 PopupMenu.border = com.formdev.flatlaf.ui.FlatPopupMenuBorder
 PopupMenu.borderInsets = 4,1,4,1
 PopupMenu.borderCornerRadius = $Popup.borderCornerRadius
-[mac]PopupMenu.roundedBorderWidth = $Popup.roundedBorderWidth
+PopupMenu.roundedBorderWidth = $Popup.roundedBorderWidth
 PopupMenu.background = @menuBackground
 PopupMenu.scrollArrowColor = @buttonArrowColor
 
@@ -913,7 +913,7 @@ ToolTipManager.enableToolTipMode = activeApplication
 #---- ToolTip ----
 
 ToolTip.borderCornerRadius = $Popup.borderCornerRadius
-[mac]ToolTip.roundedBorderWidth = $Popup.roundedBorderWidth
+ToolTip.roundedBorderWidth = $Popup.roundedBorderWidth
 
 
 #---- Tree ----
@@ -934,6 +934,7 @@ Tree.rendererMargins = 1,2,1,2
 Tree.selectionInsets = 0,0,0,0
 Tree.selectionArc = 0
 Tree.wideSelection = true
+Tree.wideCellRenderer = false
 Tree.repaintWholeRow = true
 Tree.paintLines = false
 Tree.showCellFocusIndicator = false

flatlaf-core/src/main/resources/com/formdev/flatlaf/FlatLightLaf.properties

@@ -253,6 +253,7 @@ PasswordField.revealIconColor = tint(@foreground,40%)
 
 #---- Popup ----
 
+[mac]Popup.roundedBorderWidth = 0
 Popup.dropShadowColor = #000
 Popup.dropShadowOpacity = 0.15
 

flatlaf-core/src/test/java/com/formdev/flatlaf/ui/TestFlatHTML.java

@@ -16,6 +16,7 @@
 
 package com.formdev.flatlaf.ui;
 
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import java.util.Locale;
 import javax.swing.JComponent;
@@ -73,6 +74,15 @@ public class TestFlatHTML
 		testHtmlBaseSize( "<html>${BASE_SIZE}<style type='text/css'>body { color: #f00; }</style><h1>header1</h1>" + body + "</html>", "header1\n" + bodyPlain );
 	}
 
+	@Test
+	void htmlOnComponentWithNullFont() {
+		assertDoesNotThrow( () -> {
+			JLabel label = new JLabel();
+			label.setFont( null );
+			label.setText( "<html>foo<br>bar</html>" );
+		} );
+	}
+
 	private void testHtmlBaseSize( String html, String expectedPlain ) {
 		testHtmlBaseSizeImpl( html, expectedPlain );
 		testHtmlBaseSizeImpl( html.toUpperCase( Locale.ENGLISH ), expectedPlain.toUpperCase( Locale.ENGLISH ) );

flatlaf-core/src/test/java/com/formdev/flatlaf/ui/TestFlatStyleableInfo.java

@@ -270,6 +270,7 @@ public class TestFlatStyleableInfo
 			"selectionForeground", Color.class,
 			"selectionInactiveBackground", Color.class,
 			"selectionInactiveForeground", Color.class,
+			"alternateRowColor", Color.class,
 			"selectionInsets", Insets.class,
 			"selectionArc", int.class,
 
@@ -517,6 +518,8 @@ public class TestFlatStyleableInfo
 			"icon.borderWidth", float.class,
 			"icon.selectedBorderWidth", float.class,
 			"icon.disabledSelectedBorderWidth", float.class,
+			"icon.indeterminateBorderWidth", float.class,
+			"icon.disabledIndeterminateBorderWidth", float.class,
 			"icon.arc", int.class,
 
 			// enabled
@@ -525,6 +528,9 @@ public class TestFlatStyleableInfo
 			"icon.selectedBorderColor", Color.class,
 			"icon.selectedBackground", Color.class,
 			"icon.checkmarkColor", Color.class,
+			"icon.indeterminateBorderColor", Color.class,
+			"icon.indeterminateBackground", Color.class,
+			"icon.indeterminateCheckmarkColor", Color.class,
 
 			// disabled
 			"icon.disabledBorderColor", Color.class,
@@ -532,6 +538,9 @@ public class TestFlatStyleableInfo
 			"icon.disabledSelectedBorderColor", Color.class,
 			"icon.disabledSelectedBackground", Color.class,
 			"icon.disabledCheckmarkColor", Color.class,
+			"icon.disabledIndeterminateBorderColor", Color.class,
+			"icon.disabledIndeterminateBackground", Color.class,
+			"icon.disabledIndeterminateCheckmarkColor", Color.class,
 
 			// focused
 			"icon.focusedBorderColor", Color.class,
@@ -539,6 +548,9 @@ public class TestFlatStyleableInfo
 			"icon.focusedSelectedBorderColor", Color.class,
 			"icon.focusedSelectedBackground", Color.class,
 			"icon.focusedCheckmarkColor", Color.class,
+			"icon.focusedIndeterminateBorderColor", Color.class,
+			"icon.focusedIndeterminateBackground", Color.class,
+			"icon.focusedIndeterminateCheckmarkColor", Color.class,
 
 			// hover
 			"icon.hoverBorderColor", Color.class,
@@ -546,13 +558,19 @@ public class TestFlatStyleableInfo
 			"icon.hoverSelectedBorderColor", Color.class,
 			"icon.hoverSelectedBackground", Color.class,
 			"icon.hoverCheckmarkColor", Color.class,
+			"icon.hoverIndeterminateBorderColor", Color.class,
+			"icon.hoverIndeterminateBackground", Color.class,
+			"icon.hoverIndeterminateCheckmarkColor", Color.class,
 
 			// pressed
 			"icon.pressedBorderColor", Color.class,
 			"icon.pressedBackground", Color.class,
 			"icon.pressedSelectedBorderColor", Color.class,
 			"icon.pressedSelectedBackground", Color.class,
-			"icon.pressedCheckmarkColor", Color.class
+			"icon.pressedCheckmarkColor", Color.class,
+			"icon.pressedIndeterminateBorderColor", Color.class,
+			"icon.pressedIndeterminateBackground", Color.class,
+			"icon.pressedIndeterminateCheckmarkColor", Color.class
 		);
 	}
 
@@ -965,9 +983,11 @@ public class TestFlatStyleableInfo
 			"selectionInactiveBackground", Color.class,
 			"selectionInactiveForeground", Color.class,
 			"selectionBorderColor", Color.class,
+			"alternateRowColor", Color.class,
 			"selectionInsets", Insets.class,
 			"selectionArc", int.class,
 			"wideSelection", boolean.class,
+			"wideCellRenderer", boolean.class,
 			"showCellFocusIndicator", boolean.class,
 
 			"paintSelection", boolean.class,
@@ -1144,6 +1164,8 @@ public class TestFlatStyleableInfo
 			"borderWidth", float.class,
 			"selectedBorderWidth", float.class,
 			"disabledSelectedBorderWidth", float.class,
+			"indeterminateBorderWidth", float.class,
+			"disabledIndeterminateBorderWidth", float.class,
 			"arc", int.class,
 
 			// enabled
@@ -1152,6 +1174,9 @@ public class TestFlatStyleableInfo
 			"selectedBorderColor", Color.class,
 			"selectedBackground", Color.class,
 			"checkmarkColor", Color.class,
+			"indeterminateBorderColor", Color.class,
+			"indeterminateBackground", Color.class,
+			"indeterminateCheckmarkColor", Color.class,
 
 			// disabled
 			"disabledBorderColor", Color.class,
@@ -1159,6 +1184,9 @@ public class TestFlatStyleableInfo
 			"disabledSelectedBorderColor", Color.class,
 			"disabledSelectedBackground", Color.class,
 			"disabledCheckmarkColor", Color.class,
+			"disabledIndeterminateBorderColor", Color.class,
+			"disabledIndeterminateBackground", Color.class,
+			"disabledIndeterminateCheckmarkColor", Color.class,
 
 			// focused
 			"focusedBorderColor", Color.class,
@@ -1166,6 +1194,9 @@ public class TestFlatStyleableInfo
 			"focusedSelectedBorderColor", Color.class,
 			"focusedSelectedBackground", Color.class,
 			"focusedCheckmarkColor", Color.class,
+			"focusedIndeterminateBorderColor", Color.class,
+			"focusedIndeterminateBackground", Color.class,
+			"focusedIndeterminateCheckmarkColor", Color.class,
 
 			// hover
 			"hoverBorderColor", Color.class,
@@ -1173,13 +1204,19 @@ public class TestFlatStyleableInfo
 			"hoverSelectedBorderColor", Color.class,
 			"hoverSelectedBackground", Color.class,
 			"hoverCheckmarkColor", Color.class,
+			"hoverIndeterminateBorderColor", Color.class,
+			"hoverIndeterminateBackground", Color.class,
+			"hoverIndeterminateCheckmarkColor", Color.class,
 
 			// pressed
 			"pressedBorderColor", Color.class,
 			"pressedBackground", Color.class,
 			"pressedSelectedBorderColor", Color.class,
 			"pressedSelectedBackground", Color.class,
-			"pressedCheckmarkColor", Color.class
+			"pressedCheckmarkColor", Color.class,
+			"pressedIndeterminateBorderColor", Color.class,
+			"pressedIndeterminateBackground", Color.class,
+			"pressedIndeterminateCheckmarkColor", Color.class
 		);
 	}
 

flatlaf-core/src/test/java/com/formdev/flatlaf/ui/TestFlatStyleableValue.java

@@ -370,6 +370,7 @@ public class TestFlatStyleableValue
 		testColor( c, ui, "selectionForeground", 0x123456 );
 		testColor( c, ui, "selectionInactiveBackground", 0x123456 );
 		testColor( c, ui, "selectionInactiveForeground", 0x123456 );
+		testColor( c, ui, "alternateRowColor", 0x123456 );
 		testInsets( c, ui, "selectionInsets", 1,2,3,4 );
 		testInteger( c, ui, "selectionArc", 123 );
 
@@ -938,9 +939,11 @@ public class TestFlatStyleableValue
 		testColor( c, ui, "selectionInactiveBackground", 0x123456 );
 		testColor( c, ui, "selectionInactiveForeground", 0x123456 );
 		testColor( c, ui, "selectionBorderColor", 0x123456 );
+		testColor( c, ui, "alternateRowColor", 0x123456 );
 		testInsets( c, ui, "selectionInsets", 1,2,3,4 );
 		testInteger( c, ui, "selectionArc", 123 );
 		testBoolean( c, ui, "wideSelection", true );
+		testBoolean( c, ui, "wideCellRenderer", true );
 		testBoolean( c, ui, "showCellFocusIndicator", true );
 
 		testBoolean( c, ui, "paintSelection", false );
@@ -1146,6 +1149,8 @@ public class TestFlatStyleableValue
 		testValue( icon, "borderWidth", 1.5f );
 		testValue( icon, "selectedBorderWidth", 1.5f );
 		testValue( icon, "disabledSelectedBorderWidth", 1.5f );
+		testValue( icon, "indeterminateBorderWidth", 1.5f );
+		testValue( icon, "disabledIndeterminateBorderWidth", 1.5f );
 		testValue( icon, "arc", 5 );
 
 		// enabled
@@ -1154,6 +1159,9 @@ public class TestFlatStyleableValue
 		testValue( icon, "selectedBorderColor", Color.WHITE );
 		testValue( icon, "selectedBackground", Color.WHITE );
 		testValue( icon, "checkmarkColor", Color.WHITE );
+		testValue( icon, "indeterminateBorderColor", Color.WHITE );
+		testValue( icon, "indeterminateBackground", Color.WHITE );
+		testValue( icon, "indeterminateCheckmarkColor", Color.WHITE );
 
 		// disabled
 		testValue( icon, "disabledBorderColor", Color.WHITE );
@@ -1161,6 +1169,9 @@ public class TestFlatStyleableValue
 		testValue( icon, "disabledSelectedBorderColor", Color.WHITE );
 		testValue( icon, "disabledSelectedBackground", Color.WHITE );
 		testValue( icon, "disabledCheckmarkColor", Color.WHITE );
+		testValue( icon, "disabledIndeterminateBorderColor", Color.WHITE );
+		testValue( icon, "disabledIndeterminateBackground", Color.WHITE );
+		testValue( icon, "disabledIndeterminateCheckmarkColor", Color.WHITE );
 
 		// focused
 		testValue( icon, "focusedBorderColor", Color.WHITE );
@@ -1168,6 +1179,9 @@ public class TestFlatStyleableValue
 		testValue( icon, "focusedSelectedBorderColor", Color.WHITE );
 		testValue( icon, "focusedSelectedBackground", Color.WHITE );
 		testValue( icon, "focusedCheckmarkColor", Color.WHITE );
+		testValue( icon, "focusedIndeterminateBorderColor", Color.WHITE );
+		testValue( icon, "focusedIndeterminateBackground", Color.WHITE );
+		testValue( icon, "focusedIndeterminateCheckmarkColor", Color.WHITE );
 
 		// hover
 		testValue( icon, "hoverBorderColor", Color.WHITE );
@@ -1175,6 +1189,9 @@ public class TestFlatStyleableValue
 		testValue( icon, "hoverSelectedBorderColor", Color.WHITE );
 		testValue( icon, "hoverSelectedBackground", Color.WHITE );
 		testValue( icon, "hoverCheckmarkColor", Color.WHITE );
+		testValue( icon, "hoverIndeterminateBorderColor", Color.WHITE );
+		testValue( icon, "hoverIndeterminateBackground", Color.WHITE );
+		testValue( icon, "hoverIndeterminateCheckmarkColor", Color.WHITE );
 
 		// pressed
 		testValue( icon, "pressedBorderColor", Color.WHITE );
@@ -1182,6 +1199,9 @@ public class TestFlatStyleableValue
 		testValue( icon, "pressedSelectedBorderColor", Color.WHITE );
 		testValue( icon, "pressedSelectedBackground", Color.WHITE );
 		testValue( icon, "pressedCheckmarkColor", Color.WHITE );
+		testValue( icon, "pressedIndeterminateBorderColor", Color.WHITE );
+		testValue( icon, "pressedIndeterminateBackground", Color.WHITE );
+		testValue( icon, "pressedIndeterminateCheckmarkColor", Color.WHITE );
 	}
 
 	@Test

flatlaf-core/src/test/java/com/formdev/flatlaf/ui/TestFlatStyling.java

@@ -433,6 +433,7 @@ public class TestFlatStyling
 		ui.applyStyle( "selectionForeground: #fff" );
 		ui.applyStyle( "selectionInactiveBackground: #fff" );
 		ui.applyStyle( "selectionInactiveForeground: #fff" );
+		ui.applyStyle( "alternateRowColor: #fff" );
 		ui.applyStyle( "selectionInsets: 1,2,3,4" );
 		ui.applyStyle( "selectionArc: 8" );
 
@@ -1187,9 +1188,11 @@ public class TestFlatStyling
 		ui.applyStyle( "selectionInactiveBackground: #fff" );
 		ui.applyStyle( "selectionInactiveForeground: #fff" );
 		ui.applyStyle( "selectionBorderColor: #fff" );
+		ui.applyStyle( "alternateRowColor: #fff" );
 		ui.applyStyle( "selectionInsets: 1,2,3,4" );
 		ui.applyStyle( "selectionArc: 8" );
 		ui.applyStyle( "wideSelection: true" );
+		ui.applyStyle( "wideCellRenderer: true" );
 		ui.applyStyle( "showCellFocusIndicator: true" );
 
 		ui.applyStyle( "paintSelection: false" );
@@ -1388,6 +1391,8 @@ public class TestFlatStyling
 		icon.applyStyleProperty( "borderWidth", 1.5f );
 		icon.applyStyleProperty( "selectedBorderWidth", 1.5f );
 		icon.applyStyleProperty( "disabledSelectedBorderWidth", 1.5f );
+		icon.applyStyleProperty( "indeterminateBorderWidth", 1.5f );
+		icon.applyStyleProperty( "disabledIndeterminateBorderWidth", 1.5f );
 		icon.applyStyleProperty( "arc", 5 );
 
 		// enabled
@@ -1396,6 +1401,9 @@ public class TestFlatStyling
 		icon.applyStyleProperty( "selectedBorderColor", Color.WHITE );
 		icon.applyStyleProperty( "selectedBackground", Color.WHITE );
 		icon.applyStyleProperty( "checkmarkColor", Color.WHITE );
+		icon.applyStyleProperty( "indeterminateBorderColor", Color.WHITE );
+		icon.applyStyleProperty( "indeterminateBackground", Color.WHITE );
+		icon.applyStyleProperty( "indeterminateCheckmarkColor", Color.WHITE );
 
 		// disabled
 		icon.applyStyleProperty( "disabledBorderColor", Color.WHITE );
@@ -1403,6 +1411,9 @@ public class TestFlatStyling
 		icon.applyStyleProperty( "disabledSelectedBorderColor", Color.WHITE );
 		icon.applyStyleProperty( "disabledSelectedBackground", Color.WHITE );
 		icon.applyStyleProperty( "disabledCheckmarkColor", Color.WHITE );
+		icon.applyStyleProperty( "disabledIndeterminateBorderColor", Color.WHITE );
+		icon.applyStyleProperty( "disabledIndeterminateBackground", Color.WHITE );
+		icon.applyStyleProperty( "disabledIndeterminateCheckmarkColor", Color.WHITE );
 
 		// focused
 		icon.applyStyleProperty( "focusedBorderColor", Color.WHITE );
@@ -1410,6 +1421,9 @@ public class TestFlatStyling
 		icon.applyStyleProperty( "focusedSelectedBorderColor", Color.WHITE );
 		icon.applyStyleProperty( "focusedSelectedBackground", Color.WHITE );
 		icon.applyStyleProperty( "focusedCheckmarkColor", Color.WHITE );
+		icon.applyStyleProperty( "focusedIndeterminateBorderColor", Color.WHITE );
+		icon.applyStyleProperty( "focusedIndeterminateBackground", Color.WHITE );
+		icon.applyStyleProperty( "focusedIndeterminateCheckmarkColor", Color.WHITE );
 
 		// hover
 		icon.applyStyleProperty( "hoverBorderColor", Color.WHITE );
@@ -1417,6 +1431,9 @@ public class TestFlatStyling
 		icon.applyStyleProperty( "hoverSelectedBorderColor", Color.WHITE );
 		icon.applyStyleProperty( "hoverSelectedBackground", Color.WHITE );
 		icon.applyStyleProperty( "hoverCheckmarkColor", Color.WHITE );
+		icon.applyStyleProperty( "hoverIndeterminateBorderColor", Color.WHITE );
+		icon.applyStyleProperty( "hoverIndeterminateBackground", Color.WHITE );
+		icon.applyStyleProperty( "hoverIndeterminateCheckmarkColor", Color.WHITE );
 
 		// pressed
 		icon.applyStyleProperty( "pressedBorderColor", Color.WHITE );
@@ -1424,6 +1441,9 @@ public class TestFlatStyling
 		icon.applyStyleProperty( "pressedSelectedBorderColor", Color.WHITE );
 		icon.applyStyleProperty( "pressedSelectedBackground", Color.WHITE );
 		icon.applyStyleProperty( "pressedCheckmarkColor", Color.WHITE );
+		icon.applyStyleProperty( "pressedIndeterminateBorderColor", Color.WHITE );
+		icon.applyStyleProperty( "pressedIndeterminateBackground", Color.WHITE );
+		icon.applyStyleProperty( "pressedIndeterminateCheckmarkColor", Color.WHITE );
 	}
 
 	@Test

flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/BasicComponentsPanel.java

@@ -277,22 +277,22 @@ class BasicComponentsPanel
 
 		//---- button5 ----
 		button5.setText("Square");
-		button5.putClientProperty("JButton.buttonType", "square");
+		button5.putClientProperty(FlatClientProperties.BUTTON_TYPE, FlatClientProperties.BUTTON_TYPE_SQUARE);
 		add(button5, "cell 3 1");
 
 		//---- button6 ----
 		button6.setText("Round");
-		button6.putClientProperty("JButton.buttonType", "roundRect");
+		button6.putClientProperty(FlatClientProperties.BUTTON_TYPE, FlatClientProperties.BUTTON_TYPE_ROUND_RECT);
 		add(button6, "cell 4 1");
 
 		//---- button3 ----
 		button3.setText("Help");
-		button3.putClientProperty("JButton.buttonType", "help");
+		button3.putClientProperty(FlatClientProperties.BUTTON_TYPE, FlatClientProperties.BUTTON_TYPE_HELP);
 		add(button3, "cell 4 1");
 
 		//---- button4 ----
 		button4.setText("Help");
-		button4.putClientProperty("JButton.buttonType", "help");
+		button4.putClientProperty(FlatClientProperties.BUTTON_TYPE, FlatClientProperties.BUTTON_TYPE_HELP);
 		button4.setEnabled(false);
 		add(button4, "cell 4 1");
 
@@ -432,7 +432,7 @@ class BasicComponentsPanel
 
 		//---- comboBox6 ----
 		comboBox6.setEditable(true);
-		comboBox6.putClientProperty("JTextField.placeholderText", "Placeholder");
+		comboBox6.putClientProperty(FlatClientProperties.PLACEHOLDER_TEXT, "Placeholder");
 		add(comboBox6, "cell 5 5,growx");
 
 		//---- textFieldLabel ----
@@ -463,7 +463,7 @@ class BasicComponentsPanel
 		add(textField4, "cell 4 6,growx");
 
 		//---- textField6 ----
-		textField6.putClientProperty("JTextField.placeholderText", "Placeholder");
+		textField6.putClientProperty(FlatClientProperties.PLACEHOLDER_TEXT, "Placeholder");
 		add(textField6, "cell 5 6,growx");
 
 		//---- formattedTextFieldLabel ----
@@ -494,7 +494,7 @@ class BasicComponentsPanel
 		add(formattedTextField4, "cell 4 7,growx");
 
 		//---- formattedTextField5 ----
-		formattedTextField5.putClientProperty("JTextField.placeholderText", "Placeholder");
+		formattedTextField5.putClientProperty(FlatClientProperties.PLACEHOLDER_TEXT, "Placeholder");
 		add(formattedTextField5, "cell 5 7,growx");
 
 		//---- passwordFieldLabel ----
@@ -522,7 +522,7 @@ class BasicComponentsPanel
 		add(passwordField4, "cell 4 8,growx");
 
 		//---- passwordField5 ----
-		passwordField5.putClientProperty("JTextField.placeholderText", "Placeholder");
+		passwordField5.putClientProperty(FlatClientProperties.PLACEHOLDER_TEXT, "Placeholder");
 		add(passwordField5, "cell 5 8,growx");
 
 		//---- textAreaLabel ----
@@ -703,11 +703,11 @@ class BasicComponentsPanel
 		add(errorHintsLabel, "cell 0 12");
 
 		//---- errorHintsTextField ----
-		errorHintsTextField.putClientProperty("JComponent.outline", "error");
+		errorHintsTextField.putClientProperty(FlatClientProperties.OUTLINE, FlatClientProperties.OUTLINE_ERROR);
 		add(errorHintsTextField, "cell 1 12,growx");
 
 		//---- errorHintsComboBox ----
-		errorHintsComboBox.putClientProperty("JComponent.outline", "error");
+		errorHintsComboBox.putClientProperty(FlatClientProperties.OUTLINE, FlatClientProperties.OUTLINE_ERROR);
 		errorHintsComboBox.setModel(new DefaultComboBoxModel<>(new String[] {
 			"Editable"
 		}));
@@ -715,7 +715,7 @@ class BasicComponentsPanel
 		add(errorHintsComboBox, "cell 2 12,growx");
 
 		//---- errorHintsSpinner ----
-		errorHintsSpinner.putClientProperty("JComponent.outline", "error");
+		errorHintsSpinner.putClientProperty(FlatClientProperties.OUTLINE, FlatClientProperties.OUTLINE_ERROR);
 		add(errorHintsSpinner, "cell 3 12,growx");
 
 		//---- warningHintsLabel ----
@@ -723,18 +723,18 @@ class BasicComponentsPanel
 		add(warningHintsLabel, "cell 0 13");
 
 		//---- warningHintsTextField ----
-		warningHintsTextField.putClientProperty("JComponent.outline", "warning");
+		warningHintsTextField.putClientProperty(FlatClientProperties.OUTLINE, FlatClientProperties.OUTLINE_WARNING);
 		add(warningHintsTextField, "cell 1 13,growx");
 
 		//---- warningHintsComboBox ----
-		warningHintsComboBox.putClientProperty("JComponent.outline", "warning");
+		warningHintsComboBox.putClientProperty(FlatClientProperties.OUTLINE, FlatClientProperties.OUTLINE_WARNING);
 		warningHintsComboBox.setModel(new DefaultComboBoxModel<>(new String[] {
 			"Not editable"
 		}));
 		add(warningHintsComboBox, "cell 2 13,growx");
 
 		//---- warningHintsSpinner ----
-		warningHintsSpinner.putClientProperty("JComponent.outline", "warning");
+		warningHintsSpinner.putClientProperty(FlatClientProperties.OUTLINE, FlatClientProperties.OUTLINE_WARNING);
 		add(warningHintsSpinner, "cell 3 13,growx");
 
 		//---- iconsLabel ----
@@ -765,53 +765,53 @@ class BasicComponentsPanel
 
 		//---- h00Label ----
 		h00Label.setText("H00");
-		h00Label.putClientProperty("FlatLaf.styleClass", "h00");
+		h00Label.putClientProperty(FlatClientProperties.STYLE_CLASS, "h00");
 		add(h00Label, "cell 1 16 5 1");
 
 		//---- h0Label ----
 		h0Label.setText("H0");
-		h0Label.putClientProperty("FlatLaf.styleClass", "h0");
+		h0Label.putClientProperty(FlatClientProperties.STYLE_CLASS, "h0");
 		add(h0Label, "cell 1 16 5 1");
 
 		//---- h1Label ----
 		h1Label.setText("H1");
-		h1Label.putClientProperty("FlatLaf.styleClass", "h1");
+		h1Label.putClientProperty(FlatClientProperties.STYLE_CLASS, "h1");
 		add(h1Label, "cell 1 16 5 1");
 
 		//---- h2Label ----
 		h2Label.setText("H2");
-		h2Label.putClientProperty("FlatLaf.styleClass", "h2");
+		h2Label.putClientProperty(FlatClientProperties.STYLE_CLASS, "h2");
 		add(h2Label, "cell 1 16 5 1");
 
 		//---- h3Label ----
 		h3Label.setText("H3");
-		h3Label.putClientProperty("FlatLaf.styleClass", "h3");
+		h3Label.putClientProperty(FlatClientProperties.STYLE_CLASS, "h3");
 		add(h3Label, "cell 1 16 5 1");
 
 		//---- h4Label ----
 		h4Label.setText("H4");
-		h4Label.putClientProperty("FlatLaf.styleClass", "h4");
+		h4Label.putClientProperty(FlatClientProperties.STYLE_CLASS, "h4");
 		add(h4Label, "cell 1 16 5 1");
 
 		//---- lightLabel ----
 		lightLabel.setText("light");
-		lightLabel.putClientProperty("FlatLaf.style", "font: 200% $light.font");
+		lightLabel.putClientProperty(FlatClientProperties.STYLE, "font: 200% $light.font");
 		add(lightLabel, "cell 1 16 5 1,gapx 30");
 
 		//---- semiboldLabel ----
 		semiboldLabel.setText("semibold");
-		semiboldLabel.putClientProperty("FlatLaf.style", "font: 200% $semibold.font");
+		semiboldLabel.putClientProperty(FlatClientProperties.STYLE, "font: 200% $semibold.font");
 		add(semiboldLabel, "cell 1 16 5 1");
 
 		//---- fontZoomLabel ----
 		fontZoomLabel.setText("(200%)");
-		fontZoomLabel.putClientProperty("FlatLaf.styleClass", "small");
+		fontZoomLabel.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 		fontZoomLabel.setEnabled(false);
 		add(fontZoomLabel, "cell 1 16 5 1");
 
 		//---- largeLabel ----
 		largeLabel.setText("large");
-		largeLabel.putClientProperty("FlatLaf.styleClass", "large");
+		largeLabel.putClientProperty(FlatClientProperties.STYLE_CLASS, "large");
 		add(largeLabel, "cell 1 17 5 1");
 
 		//---- defaultLabel ----
@@ -820,22 +820,22 @@ class BasicComponentsPanel
 
 		//---- mediumLabel ----
 		mediumLabel.setText("medium");
-		mediumLabel.putClientProperty("FlatLaf.styleClass", "medium");
+		mediumLabel.putClientProperty(FlatClientProperties.STYLE_CLASS, "medium");
 		add(mediumLabel, "cell 1 17 5 1");
 
 		//---- smallLabel ----
 		smallLabel.setText("small");
-		smallLabel.putClientProperty("FlatLaf.styleClass", "small");
+		smallLabel.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 		add(smallLabel, "cell 1 17 5 1");
 
 		//---- miniLabel ----
 		miniLabel.setText("mini");
-		miniLabel.putClientProperty("FlatLaf.styleClass", "mini");
+		miniLabel.putClientProperty(FlatClientProperties.STYLE_CLASS, "mini");
 		add(miniLabel, "cell 1 17 5 1");
 
 		//---- monospacedLabel ----
 		monospacedLabel.setText("monospaced");
-		monospacedLabel.putClientProperty("FlatLaf.styleClass", "monospaced");
+		monospacedLabel.putClientProperty(FlatClientProperties.STYLE_CLASS, "monospaced");
 		add(monospacedLabel, "cell 1 17 5 1,gapx 30");
 
 		//======== popupMenu1 ========

flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/DataComponentsPanel.java

@@ -22,6 +22,7 @@ import java.awt.datatransfer.DataFlavor;
 import java.awt.datatransfer.StringSelection;
 import java.awt.datatransfer.Transferable;
 import javax.swing.*;
+import javax.swing.UIDefaults.ActiveValue;
 import javax.swing.table.*;
 import javax.swing.tree.*;
 import com.formdev.flatlaf.FlatClientProperties;
@@ -65,6 +66,45 @@ class DataComponentsPanel
 		tree3.putClientProperty( FlatClientProperties.STYLE, "selectionInsets: 0,1,0,1; selectionArc: 6" );
 	}
 
+	private void listAlternatingRowsChanged() {
+		ActiveValue alternateRowColor = null;
+		if( listAlternatingRowsCheckBox.isSelected() ) {
+			alternateRowColor = table -> {
+				Color background = list1.getBackground();
+				return FlatLaf.isLafDark()
+					? ColorFunctions.lighten( background, 0.05f )
+					: ColorFunctions.darken( background, 0.05f );
+			};
+		}
+		UIManager.put( "List.alternateRowColor", alternateRowColor );
+		list1.updateUI();
+		list2.updateUI();
+		list3.updateUI();
+	}
+
+	private void treeWideSelectionChanged() {
+		boolean wideSelection = treeWideSelectionCheckBox.isSelected();
+		tree1.putClientProperty( FlatClientProperties.TREE_WIDE_SELECTION, wideSelection );
+		tree2.putClientProperty( FlatClientProperties.TREE_WIDE_SELECTION, wideSelection );
+		tree3.putClientProperty( FlatClientProperties.TREE_WIDE_SELECTION, wideSelection );
+	}
+
+	private void treeAlternatingRowsChanged() {
+		ActiveValue alternateRowColor = null;
+		if( treeAlternatingRowsCheckBox.isSelected() ) {
+			alternateRowColor = table -> {
+				Color background = tree1.getBackground();
+				return FlatLaf.isLafDark()
+					? ColorFunctions.lighten( background, 0.05f )
+					: ColorFunctions.darken( background, 0.05f );
+			};
+		}
+		UIManager.put( "Tree.alternateRowColor", alternateRowColor );
+		tree1.updateUI();
+		tree2.updateUI();
+		tree3.updateUI();
+	}
+
 	private void dndChanged() {
 		boolean dnd = dndCheckBox.isSelected();
 		DropMode dropMode = dnd ? DropMode.ON_OR_INSERT : DropMode.USE_SELECTION;
@@ -142,18 +182,20 @@ class DataComponentsPanel
 	}
 
 	private void alternatingRowsChanged() {
-		Color alternateRowColor = null;
+		ActiveValue alternateRowColor = null;
 		if( alternatingRowsCheckBox.isSelected() ) {
-			Color background = table1.getBackground();
+			alternateRowColor = table -> {
-			alternateRowColor = FlatLaf.isLafDark()
+				Color background = table1.getBackground();
-				? ColorFunctions.lighten( background, 0.05f )
+				return FlatLaf.isLafDark()
-				: ColorFunctions.darken( background, 0.05f );
+					? ColorFunctions.lighten( background, 0.05f )
+					: ColorFunctions.darken( background, 0.05f );
+			};
 		}
 		UIManager.put( "Table.alternateRowColor", alternateRowColor );
 		table1.repaint();
 	}
 
-	@SuppressWarnings( { "unchecked", "rawtypes" } )
+	@SuppressWarnings( { "rawtypes" } )
 	private void initComponents() {
 		// JFormDesigner - Component initialization - DO NOT MODIFY  //GEN-BEGIN:initComponents
 		JLabel label1 = new JLabel();
@@ -166,6 +208,8 @@ class DataComponentsPanel
 		list3 = new JList<>();
 		JScrollPane scrollPane2 = new JScrollPane();
 		list2 = new JList<>();
+		JPanel listOptionsPanel = new JPanel();
+		listAlternatingRowsCheckBox = new JCheckBox();
 		JLabel treeLabel = new JLabel();
 		JScrollPane scrollPane3 = new JScrollPane();
 		tree1 = new JTree();
@@ -173,6 +217,9 @@ class DataComponentsPanel
 		tree3 = new JTree();
 		JScrollPane scrollPane4 = new JScrollPane();
 		tree2 = new JTree();
+		JPanel treeOptionsPanel = new JPanel();
+		treeWideSelectionCheckBox = new JCheckBox();
+		treeAlternatingRowsCheckBox = new JCheckBox();
 		JLabel tableLabel = new JLabel();
 		JScrollPane scrollPane5 = new JScrollPane();
 		table1 = new JTable();
@@ -273,6 +320,22 @@ class DataComponentsPanel
 		}
 		add(scrollPane2, "cell 3 1");
 
+		//======== listOptionsPanel ========
+		{
+			listOptionsPanel.setLayout(new MigLayout(
+				"insets 0,hidemode 3",
+				// columns
+				"[fill]",
+				// rows
+				"[]"));
+
+			//---- listAlternatingRowsCheckBox ----
+			listAlternatingRowsCheckBox.setText("alternating rows");
+			listAlternatingRowsCheckBox.addActionListener(e -> listAlternatingRowsChanged());
+			listOptionsPanel.add(listAlternatingRowsCheckBox, "cell 0 0");
+		}
+		add(listOptionsPanel, "cell 4 1");
+
 		//---- treeLabel ----
 		treeLabel.setText("JTree:");
 		add(treeLabel, "cell 0 2,aligny top,growy 0");
@@ -334,6 +397,29 @@ class DataComponentsPanel
 		}
 		add(scrollPane4, "cell 3 2");
 
+		//======== treeOptionsPanel ========
+		{
+			treeOptionsPanel.setLayout(new MigLayout(
+				"insets 0,hidemode 3",
+				// columns
+				"[fill]",
+				// rows
+				"[]0" +
+				"[]"));
+
+			//---- treeWideSelectionCheckBox ----
+			treeWideSelectionCheckBox.setText("wide selection");
+			treeWideSelectionCheckBox.setSelected(true);
+			treeWideSelectionCheckBox.addActionListener(e -> treeWideSelectionChanged());
+			treeOptionsPanel.add(treeWideSelectionCheckBox, "cell 0 0");
+
+			//---- treeAlternatingRowsCheckBox ----
+			treeAlternatingRowsCheckBox.setText("alternating rows");
+			treeAlternatingRowsCheckBox.addActionListener(e -> treeAlternatingRowsChanged());
+			treeOptionsPanel.add(treeAlternatingRowsCheckBox, "cell 0 1");
+		}
+		add(treeOptionsPanel, "cell 4 2");
+
 		//---- tableLabel ----
 		tableLabel.setText("JTable:");
 		add(tableLabel, "cell 0 3,aligny top,growy 0");
@@ -379,7 +465,7 @@ class DataComponentsPanel
 			{
 				TableColumnModel cm = table1.getColumnModel();
 				cm.getColumn(2).setCellEditor(new DefaultCellEditor(
-					new JComboBox(new DefaultComboBoxModel(new String[] {
+					new JComboBox<>(new DefaultComboBoxModel<>(new String[] {
 						"January",
 						"February",
 						"March",
@@ -394,7 +480,7 @@ class DataComponentsPanel
 						"December"
 					}))));
 				cm.getColumn(3).setCellEditor(new DefaultCellEditor(
-					new JComboBox(new DefaultComboBoxModel(new String[] {
+					new JComboBox<>(new DefaultComboBoxModel<>(new String[] {
 						"January",
 						"February",
 						"March",
@@ -513,9 +599,12 @@ class DataComponentsPanel
 	private JList<String> list1;
 	private JList<String> list3;
 	private JList<String> list2;
+	private JCheckBox listAlternatingRowsCheckBox;
 	private JTree tree1;
 	private JTree tree3;
 	private JTree tree2;
+	private JCheckBox treeWideSelectionCheckBox;
+	private JCheckBox treeAlternatingRowsCheckBox;
 	private JTable table1;
 	private JCheckBox roundedSelectionCheckBox;
 	private JCheckBox showHorizontalLinesCheckBox;

flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/DataComponentsPanel.jfd

@@ -1,4 +1,4 @@
-JFDML JFormDesigner: "8.2.0.0.331" Java: "21" encoding: "UTF-8"
+JFDML JFormDesigner: "8.3" encoding: "UTF-8"
 
 new FormModel {
 	contentType: "form/swing"
@@ -92,6 +92,25 @@ new FormModel {
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 				"value": "cell 3 1"
 			} )
+			add( new FormContainer( "javax.swing.JPanel", new FormLayoutManager( class net.miginfocom.swing.MigLayout ) {
+				"$layoutConstraints": "insets 0,hidemode 3"
+				"$columnConstraints": "[fill]"
+				"$rowConstraints": "[]"
+			} ) {
+				name: "listOptionsPanel"
+				add( new FormComponent( "javax.swing.JCheckBox" ) {
+					name: "listAlternatingRowsCheckBox"
+					"text": "alternating rows"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+					addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "listAlternatingRowsChanged", false ) )
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 0"
+				} )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 4 1"
+			} )
 			add( new FormComponent( "javax.swing.JLabel" ) {
 				name: "treeLabel"
 				"text": "JTree:"
@@ -192,6 +211,36 @@ new FormModel {
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 				"value": "cell 3 2"
 			} )
+			add( new FormContainer( "javax.swing.JPanel", new FormLayoutManager( class net.miginfocom.swing.MigLayout ) {
+				"$layoutConstraints": "insets 0,hidemode 3"
+				"$columnConstraints": "[fill]"
+				"$rowConstraints": "[]0[]"
+			} ) {
+				name: "treeOptionsPanel"
+				add( new FormComponent( "javax.swing.JCheckBox" ) {
+					name: "treeWideSelectionCheckBox"
+					"text": "wide selection"
+					"selected": true
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+					addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "treeWideSelectionChanged", false ) )
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 0"
+				} )
+				add( new FormComponent( "javax.swing.JCheckBox" ) {
+					name: "treeAlternatingRowsCheckBox"
+					"text": "alternating rows"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+					addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "treeAlternatingRowsChanged", false ) )
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 1"
+				} )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 4 2"
+			} )
 			add( new FormComponent( "javax.swing.JLabel" ) {
 				name: "tableLabel"
 				"text": "JTable:"

flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/MoreComponentsPanel.java

@@ -19,6 +19,7 @@ package com.formdev.flatlaf.demo;
 import java.awt.*;
 import javax.swing.*;
 import javax.swing.border.*;
+import com.formdev.flatlaf.FlatClientProperties;
 import net.miginfocom.swing.*;
 
 /**
@@ -176,12 +177,12 @@ class MoreComponentsPanel
 		add(scrollBar3, "cell 2 0 1 6,growy");
 
 		//---- scrollBar7 ----
-		scrollBar7.putClientProperty("JScrollBar.showButtons", true);
+		scrollBar7.putClientProperty(FlatClientProperties.SCROLL_BAR_SHOW_BUTTONS, true);
 		add(scrollBar7, "cell 2 0 1 6,growy");
 
 		//---- scrollBar8 ----
 		scrollBar8.setEnabled(false);
-		scrollBar8.putClientProperty("JScrollBar.showButtons", true);
+		scrollBar8.putClientProperty(FlatClientProperties.SCROLL_BAR_SHOW_BUTTONS, true);
 		add(scrollBar8, "cell 2 0 1 6,growy");
 
 		//---- separator2 ----
@@ -301,13 +302,13 @@ class MoreComponentsPanel
 
 		//---- scrollBar5 ----
 		scrollBar5.setOrientation(Adjustable.HORIZONTAL);
-		scrollBar5.putClientProperty("JScrollBar.showButtons", true);
+		scrollBar5.putClientProperty(FlatClientProperties.SCROLL_BAR_SHOW_BUTTONS, true);
 		add(scrollBar5, "cell 1 3,growx");
 
 		//---- scrollBar6 ----
 		scrollBar6.setOrientation(Adjustable.HORIZONTAL);
 		scrollBar6.setEnabled(false);
-		scrollBar6.putClientProperty("JScrollBar.showButtons", true);
+		scrollBar6.putClientProperty(FlatClientProperties.SCROLL_BAR_SHOW_BUTTONS, true);
 		add(scrollBar6, "cell 1 4,growx");
 
 		//---- separatorLabel ----
@@ -518,7 +519,7 @@ class MoreComponentsPanel
 
 		//======== panel5 ========
 		{
-			panel5.putClientProperty("FlatLaf.style", "arc: 16; background: darken($Panel.background,5%)");
+			panel5.putClientProperty(FlatClientProperties.STYLE, "arc: 16; background: darken($Panel.background,5%)");
 			panel5.setLayout(new BorderLayout());
 
 			//---- label9 ----
@@ -530,7 +531,7 @@ class MoreComponentsPanel
 
 		//======== panel4 ========
 		{
-			panel4.putClientProperty("FlatLaf.style", "border: 1,1,1,1,@disabledForeground,1,16; background: darken($Panel.background,5%)");
+			panel4.putClientProperty(FlatClientProperties.STYLE, "border: 1,1,1,1,@disabledForeground,1,16; background: darken($Panel.background,5%)");
 			panel4.setLayout(new BorderLayout());
 
 			//---- label8 ----
@@ -546,14 +547,14 @@ class MoreComponentsPanel
 
 		//---- label13 ----
 		label13.setText("rounded background");
-		label13.putClientProperty("FlatLaf.style", "arc: 999; border: 2,10,2,10");
+		label13.putClientProperty(FlatClientProperties.STYLE, "arc: 999; border: 2,10,2,10");
 		label13.setBackground(new Color(0xb8e4f3));
 		label13.setForeground(new Color(0x135b76));
 		add(label13, "cell 1 13 4 1");
 
 		//---- label10 ----
 		label10.setText("rounded border");
-		label10.putClientProperty("FlatLaf.style", "arc: 999; border: 2,10,2,10,#135b76");
+		label10.putClientProperty(FlatClientProperties.STYLE, "arc: 999; border: 2,10,2,10,#135b76");
 		label10.setBackground(new Color(0xb8e4f3));
 		label10.setForeground(new Color(0x135b76));
 		add(label10, "cell 1 13 4 1");

flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/TabsPanel.java

@@ -16,6 +16,7 @@
 
 package com.formdev.flatlaf.demo;
 
+import com.formdev.flatlaf.FlatClientProperties;
 import static com.formdev.flatlaf.FlatClientProperties.*;
 import java.awt.*;
 import java.awt.event.MouseEvent;
@@ -471,7 +472,7 @@ class TabsPanel
 
 					//---- tabPlacementLabel ----
 					tabPlacementLabel.setText("Tab placement");
-					tabPlacementLabel.putClientProperty("FlatLaf.styleClass", "h3");
+					tabPlacementLabel.putClientProperty(FlatClientProperties.STYLE_CLASS, "h3");
 					panel1.add(tabPlacementLabel, "cell 0 0");
 
 					//======== tabPlacementToolBar ========
@@ -482,38 +483,38 @@ class TabsPanel
 						//---- topPlacementButton ----
 						topPlacementButton.setText("top");
 						topPlacementButton.setSelected(true);
-						topPlacementButton.putClientProperty("FlatLaf.styleClass", "small");
+						topPlacementButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 						topPlacementButton.addActionListener(e -> tabPlacementChanged());
 						tabPlacementToolBar.add(topPlacementButton);
 
 						//---- bottomPlacementButton ----
 						bottomPlacementButton.setText("bottom");
-						bottomPlacementButton.putClientProperty("FlatLaf.styleClass", "small");
+						bottomPlacementButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 						bottomPlacementButton.addActionListener(e -> tabPlacementChanged());
 						tabPlacementToolBar.add(bottomPlacementButton);
 
 						//---- leftPlacementButton ----
 						leftPlacementButton.setText("left");
-						leftPlacementButton.putClientProperty("FlatLaf.styleClass", "small");
+						leftPlacementButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 						leftPlacementButton.addActionListener(e -> tabPlacementChanged());
 						tabPlacementToolBar.add(leftPlacementButton);
 
 						//---- rightPlacementButton ----
 						rightPlacementButton.setText("right");
-						rightPlacementButton.putClientProperty("FlatLaf.styleClass", "small");
+						rightPlacementButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 						rightPlacementButton.addActionListener(e -> tabPlacementChanged());
 						tabPlacementToolBar.add(rightPlacementButton);
 						tabPlacementToolBar.addSeparator();
 
 						//---- scrollButton ----
 						scrollButton.setText("scroll");
-						scrollButton.putClientProperty("FlatLaf.styleClass", "small");
+						scrollButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 						scrollButton.addActionListener(e -> scrollChanged());
 						tabPlacementToolBar.add(scrollButton);
 
 						//---- borderButton ----
 						borderButton.setText("border");
-						borderButton.putClientProperty("FlatLaf.styleClass", "small");
+						borderButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 						borderButton.addActionListener(e -> borderChanged());
 						tabPlacementToolBar.add(borderButton);
 					}
@@ -522,7 +523,7 @@ class TabsPanel
 
 					//---- tabLayoutLabel ----
 					tabLayoutLabel.setText("Tab layout");
-					tabLayoutLabel.putClientProperty("FlatLaf.styleClass", "h3");
+					tabLayoutLabel.putClientProperty(FlatClientProperties.STYLE_CLASS, "h3");
 					panel1.add(tabLayoutLabel, "cell 0 2");
 
 					//======== tabLayoutToolBar ========
@@ -533,13 +534,13 @@ class TabsPanel
 						//---- scrollTabLayoutButton ----
 						scrollTabLayoutButton.setText("scroll");
 						scrollTabLayoutButton.setSelected(true);
-						scrollTabLayoutButton.putClientProperty("FlatLaf.styleClass", "small");
+						scrollTabLayoutButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 						scrollTabLayoutButton.addActionListener(e -> tabLayoutChanged());
 						tabLayoutToolBar.add(scrollTabLayoutButton);
 
 						//---- wrapTabLayoutButton ----
 						wrapTabLayoutButton.setText("wrap");
-						wrapTabLayoutButton.putClientProperty("FlatLaf.styleClass", "small");
+						wrapTabLayoutButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 						wrapTabLayoutButton.addActionListener(e -> tabLayoutChanged());
 						tabLayoutToolBar.add(wrapTabLayoutButton);
 					}
@@ -548,20 +549,20 @@ class TabsPanel
 					//---- scrollLayoutNoteLabel ----
 					scrollLayoutNoteLabel.setText("(use mouse wheel to scroll; arrow button shows hidden tabs)");
 					scrollLayoutNoteLabel.setEnabled(false);
-					scrollLayoutNoteLabel.putClientProperty("FlatLaf.styleClass", "small");
+					scrollLayoutNoteLabel.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 					panel1.add(scrollLayoutNoteLabel, "cell 0 3");
 
 					//---- wrapLayoutNoteLabel ----
 					wrapLayoutNoteLabel.setText("(probably better to use scroll layout?)");
 					wrapLayoutNoteLabel.setEnabled(false);
-					wrapLayoutNoteLabel.putClientProperty("FlatLaf.styleClass", "small");
+					wrapLayoutNoteLabel.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 					panel1.add(wrapLayoutNoteLabel, "cell 0 3");
 					panel1.add(scrollLayoutTabbedPane, "cell 0 4");
 					panel1.add(wrapLayoutTabbedPane, "cell 0 4,width 100:100,height pref*2px");
 
 					//---- closableTabsLabel ----
 					closableTabsLabel.setText("Closable tabs");
-					closableTabsLabel.putClientProperty("FlatLaf.styleClass", "h3");
+					closableTabsLabel.putClientProperty(FlatClientProperties.STYLE_CLASS, "h3");
 					panel1.add(closableTabsLabel, "cell 0 5");
 
 					//======== closableTabsToolBar ========
@@ -572,19 +573,19 @@ class TabsPanel
 						//---- squareCloseButton ----
 						squareCloseButton.setText("square");
 						squareCloseButton.setSelected(true);
-						squareCloseButton.putClientProperty("FlatLaf.styleClass", "small");
+						squareCloseButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 						squareCloseButton.addActionListener(e -> closeButtonStyleChanged());
 						closableTabsToolBar.add(squareCloseButton);
 
 						//---- circleCloseButton ----
 						circleCloseButton.setText("circle");
-						circleCloseButton.putClientProperty("FlatLaf.styleClass", "small");
+						circleCloseButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 						circleCloseButton.addActionListener(e -> closeButtonStyleChanged());
 						closableTabsToolBar.add(circleCloseButton);
 
 						//---- redCrossCloseButton ----
 						redCrossCloseButton.setText("red cross");
-						redCrossCloseButton.putClientProperty("FlatLaf.styleClass", "small");
+						redCrossCloseButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 						redCrossCloseButton.addActionListener(e -> closeButtonStyleChanged());
 						closableTabsToolBar.add(redCrossCloseButton);
 					}
@@ -593,7 +594,7 @@ class TabsPanel
 
 					//---- tabAreaComponentsLabel ----
 					tabAreaComponentsLabel.setText("Custom tab area components");
-					tabAreaComponentsLabel.putClientProperty("FlatLaf.styleClass", "h3");
+					tabAreaComponentsLabel.putClientProperty(FlatClientProperties.STYLE_CLASS, "h3");
 					panel1.add(tabAreaComponentsLabel, "cell 0 7");
 
 					//======== tabAreaComponentsToolBar ========
@@ -604,14 +605,14 @@ class TabsPanel
 						//---- leadingComponentButton ----
 						leadingComponentButton.setText("leading");
 						leadingComponentButton.setSelected(true);
-						leadingComponentButton.putClientProperty("FlatLaf.styleClass", "small");
+						leadingComponentButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 						leadingComponentButton.addActionListener(e -> customComponentsChanged());
 						tabAreaComponentsToolBar.add(leadingComponentButton);
 
 						//---- trailingComponentButton ----
 						trailingComponentButton.setText("trailing");
 						trailingComponentButton.setSelected(true);
-						trailingComponentButton.putClientProperty("FlatLaf.styleClass", "small");
+						trailingComponentButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 						trailingComponentButton.addActionListener(e -> customComponentsChanged());
 						tabAreaComponentsToolBar.add(trailingComponentButton);
 					}
@@ -642,13 +643,13 @@ class TabsPanel
 
 					//---- tabIconPlacementLabel ----
 					tabIconPlacementLabel.setText("Tab icon placement");
-					tabIconPlacementLabel.putClientProperty("FlatLaf.styleClass", "h3");
+					tabIconPlacementLabel.putClientProperty(FlatClientProperties.STYLE_CLASS, "h3");
 					panel2.add(tabIconPlacementLabel, "cell 0 0");
 
 					//---- tabIconPlacementNodeLabel ----
 					tabIconPlacementNodeLabel.setText("(top/bottom/leading/trailing)");
 					tabIconPlacementNodeLabel.setEnabled(false);
-					tabIconPlacementNodeLabel.putClientProperty("FlatLaf.styleClass", "small");
+					tabIconPlacementNodeLabel.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 					panel2.add(tabIconPlacementNodeLabel, "cell 0 1");
 					panel2.add(iconTopTabbedPane, "cell 0 2");
 					panel2.add(iconBottomTabbedPane, "cell 0 3");
@@ -657,13 +658,13 @@ class TabsPanel
 
 					//---- tabAreaAlignmentLabel ----
 					tabAreaAlignmentLabel.setText("Tab area alignment");
-					tabAreaAlignmentLabel.putClientProperty("FlatLaf.styleClass", "h3");
+					tabAreaAlignmentLabel.putClientProperty(FlatClientProperties.STYLE_CLASS, "h3");
 					panel2.add(tabAreaAlignmentLabel, "cell 0 6");
 
 					//---- tabAreaAlignmentNoteLabel ----
 					tabAreaAlignmentNoteLabel.setText("(leading/center/trailing/fill)");
 					tabAreaAlignmentNoteLabel.setEnabled(false);
-					tabAreaAlignmentNoteLabel.putClientProperty("FlatLaf.styleClass", "small");
+					tabAreaAlignmentNoteLabel.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 					panel2.add(tabAreaAlignmentNoteLabel, "cell 0 7");
 					panel2.add(alignLeadingTabbedPane, "cell 0 8");
 					panel2.add(alignCenterTabbedPane, "cell 0 9");
@@ -692,13 +693,13 @@ class TabsPanel
 
 					//---- tabWidthModeLabel ----
 					tabWidthModeLabel.setText("Tab width mode");
-					tabWidthModeLabel.putClientProperty("FlatLaf.styleClass", "h3");
+					tabWidthModeLabel.putClientProperty(FlatClientProperties.STYLE_CLASS, "h3");
 					panel3.add(tabWidthModeLabel, "cell 0 0");
 
 					//---- tabWidthModeNoteLabel ----
 					tabWidthModeNoteLabel.setText("(preferred/equal/compact)");
 					tabWidthModeNoteLabel.setEnabled(false);
-					tabWidthModeNoteLabel.putClientProperty("FlatLaf.styleClass", "small");
+					tabWidthModeNoteLabel.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 					panel3.add(tabWidthModeNoteLabel, "cell 0 1");
 					panel3.add(widthPreferredTabbedPane, "cell 0 2");
 					panel3.add(widthEqualTabbedPane, "cell 0 3");
@@ -706,14 +707,14 @@ class TabsPanel
 
 					//---- minMaxTabWidthLabel ----
 					minMaxTabWidthLabel.setText("Minimum/maximum tab width");
-					minMaxTabWidthLabel.putClientProperty("FlatLaf.styleClass", "h3");
+					minMaxTabWidthLabel.putClientProperty(FlatClientProperties.STYLE_CLASS, "h3");
 					panel3.add(minMaxTabWidthLabel, "cell 0 5");
 					panel3.add(minimumTabWidthTabbedPane, "cell 0 6");
 					panel3.add(maximumTabWidthTabbedPane, "cell 0 7");
 
 					//---- tabAlignmentLabel ----
 					tabAlignmentLabel.setText("Tab title alignment");
-					tabAlignmentLabel.putClientProperty("FlatLaf.styleClass", "h3");
+					tabAlignmentLabel.putClientProperty(FlatClientProperties.STYLE_CLASS, "h3");
 					panel3.add(tabAlignmentLabel, "cell 0 8");
 
 					//======== panel5 ========
@@ -733,13 +734,13 @@ class TabsPanel
 						//---- tabAlignmentNoteLabel ----
 						tabAlignmentNoteLabel.setText("(leading/center/trailing)");
 						tabAlignmentNoteLabel.setEnabled(false);
-						tabAlignmentNoteLabel.putClientProperty("FlatLaf.styleClass", "small");
+						tabAlignmentNoteLabel.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 						panel5.add(tabAlignmentNoteLabel, "cell 0 0");
 
 						//---- tabAlignmentNoteLabel2 ----
 						tabAlignmentNoteLabel2.setText("(trailing)");
 						tabAlignmentNoteLabel2.setEnabled(false);
-						tabAlignmentNoteLabel2.putClientProperty("FlatLaf.styleClass", "small");
+						tabAlignmentNoteLabel2.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 						panel5.add(tabAlignmentNoteLabel2, "cell 1 0,alignx right,growx 0");
 						panel5.add(tabAlignLeadingTabbedPane, "cell 0 1");
 
@@ -787,19 +788,19 @@ class TabsPanel
 				//---- scrollAsNeededSingleButton ----
 				scrollAsNeededSingleButton.setText("asNeededSingle");
 				scrollAsNeededSingleButton.setSelected(true);
-				scrollAsNeededSingleButton.putClientProperty("FlatLaf.styleClass", "small");
+				scrollAsNeededSingleButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 				scrollAsNeededSingleButton.addActionListener(e -> scrollButtonsPolicyChanged());
 				scrollButtonsPolicyToolBar.add(scrollAsNeededSingleButton);
 
 				//---- scrollAsNeededButton ----
 				scrollAsNeededButton.setText("asNeeded");
-				scrollAsNeededButton.putClientProperty("FlatLaf.styleClass", "small");
+				scrollAsNeededButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 				scrollAsNeededButton.addActionListener(e -> scrollButtonsPolicyChanged());
 				scrollButtonsPolicyToolBar.add(scrollAsNeededButton);
 
 				//---- scrollNeverButton ----
 				scrollNeverButton.setText("never");
-				scrollNeverButton.putClientProperty("FlatLaf.styleClass", "small");
+				scrollNeverButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 				scrollNeverButton.addActionListener(e -> scrollButtonsPolicyChanged());
 				scrollButtonsPolicyToolBar.add(scrollNeverButton);
 			}
@@ -817,13 +818,13 @@ class TabsPanel
 				//---- popupAsNeededButton ----
 				popupAsNeededButton.setText("asNeeded");
 				popupAsNeededButton.setSelected(true);
-				popupAsNeededButton.putClientProperty("FlatLaf.styleClass", "small");
+				popupAsNeededButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 				popupAsNeededButton.addActionListener(e -> tabsPopupPolicyChanged());
 				tabsPopupPolicyToolBar.add(popupAsNeededButton);
 
 				//---- popupNeverButton ----
 				popupNeverButton.setText("never");
-				popupNeverButton.putClientProperty("FlatLaf.styleClass", "small");
+				popupNeverButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 				popupNeverButton.addActionListener(e -> tabsPopupPolicyChanged());
 				tabsPopupPolicyToolBar.add(popupNeverButton);
 			}
@@ -846,13 +847,13 @@ class TabsPanel
 				//---- scrollBothButton ----
 				scrollBothButton.setText("both");
 				scrollBothButton.setSelected(true);
-				scrollBothButton.putClientProperty("FlatLaf.styleClass", "small");
+				scrollBothButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 				scrollBothButton.addActionListener(e -> scrollButtonsPlacementChanged());
 				scrollButtonsPlacementToolBar.add(scrollBothButton);
 
 				//---- scrollTrailingButton ----
 				scrollTrailingButton.setText("trailing");
-				scrollTrailingButton.putClientProperty("FlatLaf.styleClass", "small");
+				scrollTrailingButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 				scrollTrailingButton.addActionListener(e -> scrollButtonsPlacementChanged());
 				scrollButtonsPlacementToolBar.add(scrollTrailingButton);
 			}
@@ -869,13 +870,13 @@ class TabsPanel
 				//---- underlinedTabTypeButton ----
 				underlinedTabTypeButton.setText("underlined");
 				underlinedTabTypeButton.setSelected(true);
-				underlinedTabTypeButton.putClientProperty("FlatLaf.styleClass", "small");
+				underlinedTabTypeButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 				underlinedTabTypeButton.addActionListener(e -> tabTypeChanged());
 				tabTypeToolBar.add(underlinedTabTypeButton);
 
 				//---- cardTabTypeButton ----
 				cardTabTypeButton.setText("card");
-				cardTabTypeButton.putClientProperty("FlatLaf.styleClass", "small");
+				cardTabTypeButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 				cardTabTypeButton.addActionListener(e -> tabTypeChanged());
 				tabTypeToolBar.add(cardTabTypeButton);
 			}
@@ -893,25 +894,25 @@ class TabsPanel
 				//---- rotationNoneButton ----
 				rotationNoneButton.setText("none");
 				rotationNoneButton.setSelected(true);
-				rotationNoneButton.putClientProperty("FlatLaf.styleClass", "small");
+				rotationNoneButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 				rotationNoneButton.addActionListener(e -> tabRotationChanged());
 				tabRotationToolBar.add(rotationNoneButton);
 
 				//---- rotationAutoButton ----
 				rotationAutoButton.setText("auto");
-				rotationAutoButton.putClientProperty("FlatLaf.styleClass", "small");
+				rotationAutoButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 				rotationAutoButton.addActionListener(e -> tabRotationChanged());
 				tabRotationToolBar.add(rotationAutoButton);
 
 				//---- rotationLeftButton ----
 				rotationLeftButton.setText("left");
-				rotationLeftButton.putClientProperty("FlatLaf.styleClass", "small");
+				rotationLeftButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 				rotationLeftButton.addActionListener(e -> tabRotationChanged());
 				tabRotationToolBar.add(rotationLeftButton);
 
 				//---- rotationRightButton ----
 				rotationRightButton.setText("right");
-				rotationRightButton.putClientProperty("FlatLaf.styleClass", "small");
+				rotationRightButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 				rotationRightButton.addActionListener(e -> tabRotationChanged());
 				tabRotationToolBar.add(rotationRightButton);
 			}

flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/intellijthemes/IJThemesPanel.java

@@ -45,6 +45,7 @@ import javax.swing.*;
 import javax.swing.border.Border;
 import javax.swing.border.CompoundBorder;
 import javax.swing.event.*;
+import com.formdev.flatlaf.FlatClientProperties;
 import com.formdev.flatlaf.FlatDarculaLaf;
 import com.formdev.flatlaf.FlatDarkLaf;
 import com.formdev.flatlaf.FlatIntelliJLaf;
@@ -554,7 +555,7 @@ public class IJThemesPanel
 			"light",
 			"dark"
 		}));
-		filterComboBox.putClientProperty("JComponent.minimumWidth", 0);
+		filterComboBox.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
 		filterComboBox.setFocusable(false);
 		filterComboBox.addActionListener(e -> filterChanged());
 		add(filterComboBox, "cell 0 0,alignx right,growx 0");

flatlaf-extras/src/main/java/com/formdev/flatlaf/extras/FlatInspector.java

@@ -125,9 +125,12 @@ public class FlatInspector
 	 * Installs a key listener into the application that allows enabling and disabling
 	 * the UI inspector with the given keystroke (e.g. "ctrl shift alt X").
 	 *
-	 * @param activationKeys a keystroke (e.g. "ctrl shift alt X")
+	 * @param activationKeys a keystroke (e.g. "ctrl shift alt X"), or {@code null} to use "ctrl shift alt X"
 	 */
 	public static void install( String activationKeys ) {
+		if( activationKeys == null )
+			activationKeys = "ctrl shift alt X";
+
 		KeyStroke keyStroke = KeyStroke.getKeyStroke( activationKeys );
 		Toolkit.getDefaultToolkit().addAWTEventListener( e -> {
 			if( e.getID() == KeyEvent.KEY_RELEASED &&

flatlaf-extras/src/main/java/com/formdev/flatlaf/extras/FlatSVGIcon.java

@@ -37,6 +37,7 @@ import java.net.URL;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.function.BiFunction;
 import java.util.function.Function;
 import javax.swing.Icon;
 import javax.swing.ImageIcon;
@@ -588,7 +589,12 @@ public class FlatSVGIcon
 				: GrayFilter.createDisabledIconFilter( dark );
 		}
 
-		Graphics2D g2 = new GraphicsFilter( (Graphics2D) g.create(), colorFilter, ColorFilter.getInstance(), grayFilter );
+		ColorFilter globalColorFilter = ColorFilter.getInstance();
+		globalColorFilter.c = c;
+		if( colorFilter != null )
+			colorFilter.c = c;
+
+		Graphics2D g2 = new GraphicsFilter( (Graphics2D) g.create(), colorFilter, globalColorFilter, grayFilter );
 
 		try {
 			setRenderingHints( g2 );
@@ -596,6 +602,10 @@ public class FlatSVGIcon
 			paintSvg( g2, x, y );
 		} finally {
 			g2.dispose();
+
+			globalColorFilter.c = null;
+			if( colorFilter != null )
+				colorFilter.c = null;
 		}
 	}
 
@@ -760,6 +770,8 @@ public class FlatSVGIcon
 		private Map<Color, Color> colorMap;
 		private Map<Color, Color> darkColorMap;
 		private Function<Color, Color> mapper;
+		private BiFunction<Component, Color, Color> mapperEx;
+		private Component c;
 
 		/**
 		 * Returns the global ColorFilter that is applied to all icons.
@@ -800,6 +812,22 @@ public class FlatSVGIcon
 			setMapper( mapper );
 		}
 
+		/**
+		 * Creates a color modifying function that changes painted colors.
+		 * The {@link BiFunction} gets passed the component and
+		 * the original color and returns a modified one.
+		 * <p>
+		 * Examples:
+		 * A ColorFilter can be used to brighten colors of the icon (depending on component state if desired):
+		 * <pre>new ColorFilter( (c, color) -&gt; c.isEnabled() ? color.brighter() : color );</pre>
+		 *
+		 * @param mapperEx The color mapper function
+		 * @since 3.6
+		 */
+		public ColorFilter( BiFunction<Component, Color, Color> mapperEx ) {
+			setMapperEx( mapperEx );
+		}
+
 		/**
 		 * Returns a color modifying function or {@code null}
 		 *
@@ -821,12 +849,39 @@ public class FlatSVGIcon
 		 * <pre>filter.setMapper( color -&gt; Color.RED );</pre>
 		 *
 		 * @param mapper The color mapper function
+		 * @see #setMapperEx(BiFunction)
 		 * @since 1.2
 		 */
 		public void setMapper( Function<Color, Color> mapper ) {
 			this.mapper = mapper;
 		}
 
+		/**
+		 * Returns a color modifying function or {@code null}
+		 *
+		 * @since 3.6
+		 */
+		public BiFunction<Component, Color, Color> getMapperEx() {
+			return mapperEx;
+		}
+
+		/**
+		 * Sets a color modifying function that changes painted colors.
+		 * The {@link BiFunction} gets passed the component and
+		 * the original color and returns a modified one.
+		 * <p>
+		 * Examples:
+		 * A ColorFilter can be used to brighten colors of the icon (depending on component state if desired):
+		 * <pre>filter.setMapperEx( (c, color) -&gt; c.isEnabled() ? color.brighter() : color );</pre>
+		 *
+		 * @param mapperEx The color mapper function
+		 * @see #setMapper(Function)
+		 * @since 3.6
+		 */
+		public void setMapperEx( BiFunction<Component, Color, Color> mapperEx ) {
+			this.mapperEx = mapperEx;
+		}
+
 		/**
 		 * Returns the color mappings used for light themes.
 		 *
@@ -936,6 +991,11 @@ public class FlatSVGIcon
 		}
 
 		public Color filter( Color color ) {
+			return filter( c, color );
+		}
+
+		/** @since 3.6 */
+		public Color filter( Component c, Color color ) {
 			// apply mappings
 			color = applyMappings( color );
 
@@ -943,6 +1003,10 @@ public class FlatSVGIcon
 			if( mapper != null )
 				color = mapper.apply( color );
 
+			// apply mapperEx function
+			if( mapperEx != null )
+				color = mapperEx.apply( c, color );
+
 			return color;
 		}
 
@@ -974,6 +1038,16 @@ public class FlatSVGIcon
 			return color;
 		}
 
+		/**
+		 * Returns the component passed to {@link FlatSVGIcon#paintIcon(Component, Graphics, int, int)}.
+		 * This allows color mapping depend on component state (e.g. enabled, selected, hover, etc).
+		 *
+		 * @since 3.6
+		 */
+		public Component getPaintingComponent() {
+			return c;
+		}
+
 		/**
 		 * Creates a color modifying function that uses {@link RGBImageFilter#filterRGB(int, int, int)}.
 		 * Can be set to a {@link ColorFilter} using {@link ColorFilter#setMapper(Function)}.

flatlaf-extras/src/main/java/com/formdev/flatlaf/extras/FlatUIDefaultsInspector.java

@@ -85,9 +85,12 @@ public class FlatUIDefaultsInspector
 	 * Installs a key listener into the application that allows enabling and disabling
 	 * the UI inspector with the given keystroke (e.g. "ctrl shift alt Y").
 	 *
-	 * @param activationKeys a keystroke (e.g. "ctrl shift alt Y")
+	 * @param activationKeys a keystroke (e.g. "ctrl shift alt Y"), or {@code null} to use "ctrl shift alt Y"
 	 */
 	public static void install( String activationKeys ) {
+		if( activationKeys == null )
+			activationKeys = "ctrl shift alt Y";
+
 		KeyStroke keyStroke = KeyStroke.getKeyStroke( activationKeys );
 		Toolkit.getDefaultToolkit().addAWTEventListener( e -> {
 			if( e.getID() == KeyEvent.KEY_RELEASED &&

flatlaf-extras/src/main/java/com/formdev/flatlaf/extras/components/FlatTree.java

@@ -29,19 +29,37 @@ public class FlatTree
 	implements FlatComponentExtension, FlatStyleableComponent
 {
 	/**
-	 * Returns if the tree shows a wide selection
+	 * Returns whether tree shows a wide selection
 	 */
 	public boolean isWideSelection() {
 		return getClientPropertyBoolean( TREE_WIDE_SELECTION, "Tree.wideSelection" );
 	}
 
 	/**
-	 * Sets if the tree shows a wide selection
+	 * Specifies whether tree shows a wide selection
 	 */
 	public void setWideSelection( boolean wideSelection ) {
 		putClientProperty( TREE_WIDE_SELECTION, wideSelection );
 	}
 
+	/**
+	 * Returns whether tree uses a wide cell renderer.
+	 *
+	 * @since 3.6
+	 */
+	public boolean isWideCellRenderer() {
+		return getClientPropertyBoolean( TREE_WIDE_CELL_RENDERER, "Tree.wideCellRenderer" );
+	}
+
+	/**
+	 * Specifies whether tree uses a wide cell renderer.
+	 *
+	 * @since 3.6
+	 */
+	public void setWideCellRenderer( boolean wideCellRenderer ) {
+		putClientProperty( TREE_WIDE_CELL_RENDERER, wideCellRenderer );
+	}
+
 	/**
 	 * Returns whether tree item selection is painted. Default is {@code true}.
 	 * If set to {@code false}, then the tree cell renderer is responsible for painting selection.

flatlaf-extras/src/main/resources/com/formdev/flatlaf/extras/resources/DerivedColorKeys.properties

@@ -62,6 +62,9 @@ CheckBox.icon.pressedBackground = CheckBox.icon.background
 CheckBox.icon.focusedSelectedBackground = CheckBox.icon.selectedBackground
 CheckBox.icon.hoverSelectedBackground = CheckBox.icon.selectedBackground
 CheckBox.icon.pressedSelectedBackground = CheckBox.icon.selectedBackground
+CheckBox.icon.focusedIndeterminateBackground = CheckBox.icon.indeterminateBackground
+CheckBox.icon.hoverIndeterminateBackground = CheckBox.icon.indeterminateBackground
+CheckBox.icon.pressedIndeterminateBackground = CheckBox.icon.indeterminateBackground
 
 CheckBox.icon[filled].disabledBackground = CheckBox.icon[filled].background
 CheckBox.icon[filled].focusedBackground = CheckBox.icon[filled].background
@@ -70,7 +73,9 @@ CheckBox.icon[filled].pressedBackground = CheckBox.icon[filled].background
 CheckBox.icon[filled].focusedSelectedBackground = CheckBox.icon[filled].selectedBackground
 CheckBox.icon[filled].hoverSelectedBackground = CheckBox.icon[filled].selectedBackground
 CheckBox.icon[filled].pressedSelectedBackground = CheckBox.icon[filled].selectedBackground
-
+CheckBox.icon[filled].focusedIndeterminateBackground = CheckBox.icon[filled].indeterminateBackground
+CheckBox.icon[filled].hoverIndeterminateBackground = CheckBox.icon[filled].indeterminateBackground
+CheckBox.icon[filled].pressedIndeterminateBackground = CheckBox.icon[filled].indeterminateBackground
 
 #---- CheckBoxMenuItem ----
 

flatlaf-jide-oss/src/main/java/com/formdev/flatlaf/jideoss/FlatJideOssDefaultsAddon.java

@@ -23,6 +23,7 @@ import javax.swing.LookAndFeel;
 import javax.swing.UIDefaults;
 import javax.swing.UIManager;
 import javax.swing.UIDefaults.ActiveValue;
+import com.formdev.flatlaf.FlatClientProperties;
 import com.formdev.flatlaf.FlatDefaultsAddon;
 import com.formdev.flatlaf.FlatLaf;
 import com.formdev.flatlaf.jideoss.ui.FlatJidePainter;
@@ -55,8 +56,8 @@ public class FlatJideOssDefaultsAddon
 	public void afterDefaultsLoading( LookAndFeel laf, UIDefaults defaults ) {
 		// TristateCheckBox
 		defaults.put( "TristateCheckBox.icon", null );
-		defaults.put( "TristateCheckBox.setMixed.clientProperty",   new Object[] { "JButton.selectedState", "indeterminate" } );
+		defaults.put( "TristateCheckBox.setMixed.clientProperty",   new Object[] { FlatClientProperties.SELECTED_STATE, FlatClientProperties.SELECTED_STATE_INDETERMINATE } );
-		defaults.put( "TristateCheckBox.clearMixed.clientProperty", new Object[] { "JButton.selectedState", null } );
+		defaults.put( "TristateCheckBox.clearMixed.clientProperty", new Object[] { FlatClientProperties.SELECTED_STATE, null } );
 	}
 
 	@Override

flatlaf-natives/flatlaf-natives-linux/README.md

@@ -5,12 +5,15 @@ This sub-project contains the source code for the FlatLaf Linux native library.
 
 The native library can be built only on Linux and requires a C++ compiler.
 
+The native library is available for following CPU architectures: `x86_64` (or
+`amd64`) and `arm64` (or `aarch64`).
+
 To be able to build FlatLaf on any platform, and without C++ compiler, the
-pre-built native library is checked into Git at
+pre-built native libraries are checked into Git at
 [flatlaf-core/src/main/resources/com/formdev/flatlaf/natives/](https://github.com/JFormDesigner/FlatLaf/tree/main/flatlaf-core/src/main/resources/com/formdev/flatlaf/natives).
 
-The native library was built on a GitHub server with the help of GitHub Actions.
+The native libraries were built on a GitHub server with the help of GitHub
-See:
+Actions. See:
 [Native Libraries](https://github.com/JFormDesigner/FlatLaf/actions/workflows/natives.yml)
 workflow. Then the produced Artifacts ZIP was downloaded and the native library
 checked into Git.
@@ -18,19 +21,27 @@ checked into Git.
 
 ## Development
 
-To build the library on Linux, some packages needs to be installed.
+To build the library on Linux, some packages needs to be installed:
+
+- `build-essential` - GCC and development tools
+- `libxt-dev` - X11 toolkit development headers
+- `g++-aarch64-linux-gnu` - GNU C++ compiler for the arm64 architecture (only on
+  x86_64 Linux for cross-compiling for arm64 architecture)
 
 
 ### Ubuntu
 
-`build-essential` contains GCC and development tools. `libxt-dev` contains the
-X11 toolkit development headers.
-
 ~~~
 sudo apt update
 sudo apt install build-essential libxt-dev
 ~~~
 
+Only on x86_64 Linux for cross-compiling for arm64 architecture:
+
+~~~
+sudo apt install g++-aarch64-linux-gnu
+~~~
+
 
 ### CentOS
 

flatlaf-natives/flatlaf-natives-linux/build.gradle.kts

@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 
+import java.io.FileOutputStream
+
 plugins {
 	`cpp-library`
 	`flatlaf-cpp-library`
@@ -28,11 +30,14 @@ flatlafJniHeaders {
 }
 
 library {
-	targetMachines = listOf( machines.linux.x86_64 )
+	targetMachines = listOf(
+		machines.linux.x86_64,
+		machines.linux.architecture( "aarch64" ),
+	)
 }
 
 var javaHome = System.getProperty( "java.home" )
-if( javaHome.endsWith( "jre" ) )
+if( javaHome.endsWith( "jre" ) && !file( "${javaHome}/include" ).exists() )
 	javaHome += "/.."
 
 tasks {
@@ -40,8 +45,16 @@ tasks {
 		group = "build"
 		description = "Builds natives"
 
-		if( org.gradle.internal.os.OperatingSystem.current().isLinux )
+		if( org.gradle.internal.os.OperatingSystem.current().isLinux ) {
-			dependsOn( "linkRelease" )
+			val osArch = System.getProperty( "os.arch" )
+			if( osArch == "amd64" ) {
+				dependsOn( "linkReleaseX86-64" )
+				if( file( "/usr/bin/aarch64-linux-gnu-gcc" ).exists() )
+					dependsOn( "linkCrossAarch64" )
+			}
+			if( osArch == "aarch64" )
+				dependsOn( "linkReleaseAarch64" )
+		}
 	}
 
 	withType<CppCompile>().configureEach {
@@ -67,7 +80,7 @@ tasks {
 		onlyIf { name.contains( "Release" ) }
 
 		val nativesDir = project( ":flatlaf-core" ).projectDir.resolve( "src/main/resources/com/formdev/flatlaf/natives" )
-		val libraryName = "libflatlaf-linux-x86_64.so"
+		val libraryName = if( name.contains( "X86-64" ) ) "libflatlaf-linux-x86_64.so" else "libflatlaf-linux-arm64.so"
 		val jawt = "jawt"
 		var jawtPath = "${javaHome}/lib"
 		if( JavaVersion.current() == JavaVersion.VERSION_1_8 )
@@ -85,8 +98,103 @@ tasks {
 			copy {
 				from( linkedFile )
 				into( nativesDir )
-				rename( "libflatlaf-natives-linux.so", libraryName )
+				rename( linkedFile.get().asFile.name, libraryName )
+			}
+
+//			dump( linkedFile.asFile.get(), true )
+		}
+	}
+
+	if( org.gradle.internal.os.OperatingSystem.current().isLinux &&
+		System.getProperty( "os.arch" ) == "amd64" &&
+		file( "/usr/bin/aarch64-linux-gnu-gcc" ).exists() )
+	{
+		register<Exec>( "compileCrossAarch64Cpp" ) {
+			val include = layout.projectDirectory.dir( "src/main/headers" )
+			val src = layout.projectDirectory.dir( "src/main/cpp" )
+			workingDir = file( layout.buildDirectory.dir( "obj/main/release/aarch64-cross" ) )
+
+			doFirst {
+				workingDir.mkdirs()
+			}
+
+			commandLine = listOf(
+				"aarch64-linux-gnu-gcc",
+				"-c",
+				"-fPIC",
+				"-fvisibility=hidden",
+				"-O3",
+				"-I", "${javaHome}/include",
+				"-I", "${javaHome}/include/linux",
+				"-I", "$include",
+
+				"$src/ApiVersion.cpp",
+				"$src/X11WmUtils.cpp",
+			)
+		}
+
+		register<Exec>( "linkCrossAarch64" ) {
+			dependsOn( "compileCrossAarch64Cpp" )
+
+			val nativesDir = project( ":flatlaf-core" ).projectDir.resolve( "src/main/resources/com/formdev/flatlaf/natives" )
+			val libraryName = "libflatlaf-linux-arm64.so"
+			val outDir = file( layout.buildDirectory.dir( "lib/main/release/aarch64-cross" ) )
+			val objDir = file( layout.buildDirectory.dir( "obj/main/release/aarch64-cross" ) )
+
+			doFirst {
+				outDir.mkdirs()
+			}
+
+			commandLine = listOf(
+				"aarch64-linux-gnu-gcc",
+				"-shared",
+				"-Wl,-soname,$libraryName",
+				"-o", "$outDir/$libraryName",
+
+				"$objDir/ApiVersion.o",
+				"$objDir/X11WmUtils.o",
+
+				"-L${layout.projectDirectory}/lib/aarch64",
+				"-ljawt",
+			)
+
+			doLast {
+				// copy shared library to flatlaf-core resources
+				copy {
+					from( "$outDir/$libraryName" )
+					into( nativesDir )
+				}
+
+//				dump( file( "$outDir/$libraryName" ), false )
 			}
 		}
 	}
 }
+
+/*dump
+interface InjectedExecOps { @get:Inject val execOps: ExecOperations }
+val injected = project.objects.newInstance<InjectedExecOps>()
+
+fun dump( dylib: File, disassemble: Boolean ) {
+
+	val dylibDir = dylib.parent
+	injected.execOps.exec { commandLine( "size", dylib ); standardOutput = FileOutputStream( "$dylibDir/size.txt" ) }
+	injected.execOps.exec {
+		commandLine( "objdump",
+			// commands
+			"--archive-headers",
+			"--section-headers",
+			"--private-headers",
+			"--reloc",
+			"--dynamic-reloc",
+			"--syms",
+			// files
+			dylib )
+		standardOutput = FileOutputStream( "$dylibDir/objdump.txt" )
+	}
+	if( disassemble )
+		injected.execOps.exec { commandLine( "objdump", "--disassemble-all", dylib ); standardOutput = FileOutputStream( "$dylibDir/disassemble.txt" ) }
+	injected.execOps.exec { commandLine( "objdump", "--full-contents", dylib ); standardOutput = FileOutputStream( "$dylibDir/full-contents.txt" ) }
+	injected.execOps.exec { commandLine( "hexdump", dylib ); standardOutput = FileOutputStream( "$dylibDir/hexdump.txt" ) }
+}
+dump*/

flatlaf-natives/flatlaf-natives-linux/lib/README.md

@@ -0,0 +1,4 @@
+Contains libraries used to compile FlatLaf native libraries.
+
+- `aarch64/libjawt.so` is `<jdk>/lib/libjawt.so` from Eclipse Temurin 11.0.25+9 aarch64,
+  which is required to cross build aarch64/arm64 .so on x86_64

flatlaf-natives/flatlaf-natives-macos/build.gradle.kts

@@ -43,6 +43,9 @@ var javaHome = System.getProperty( "java.home" )
 if( javaHome.endsWith( "jre" ) )
 	javaHome += "/.."
 
+interface InjectedExecOps { @get:Inject val execOps: ExecOperations }
+val injected = project.objects.newInstance<InjectedExecOps>()
+
 tasks {
 	register( "build-natives" ) {
 		group = "build"
@@ -95,21 +98,21 @@ tasks {
 
 		doLast {
 			// sign shared library
-//			exec { commandLine( "codesign", "-s", "FormDev Software GmbH", "--timestamp", "${linkedFile.asFile.get()}" ) }
+//			injected.execOps.exec { commandLine( "codesign", "-s", "FormDev Software GmbH", "--timestamp", "${linkedFile.asFile.get()}" ) }
 
 			// copy shared library to flatlaf-core resources
 			copy {
 				from( linkedFile )
 				into( nativesDir )
-				rename( "libflatlaf-natives-macos.dylib", libraryName )
+				rename( linkedFile.get().asFile.name, libraryName )
 			}
 
 /*dump
 			val dylib = linkedFile.asFile.get()
 			val dylibDir = dylib.parent
-			exec { commandLine( "size", dylib ) }
+			injected.execOps.exec { commandLine( "size", dylib ); standardOutput = FileOutputStream( "$dylibDir/size.txt" ) }
-			exec { commandLine( "size", "-m", dylib ) }
+			injected.execOps.exec { commandLine( "size", "-m", dylib ); standardOutput = FileOutputStream( "$dylibDir/size-m.txt" ) }
-			exec {
+			injected.execOps.exec {
 				commandLine( "objdump",
 					// commands
 					"--archive-headers",
@@ -127,8 +130,8 @@ tasks {
 					dylib )
 				standardOutput = FileOutputStream( "$dylibDir/objdump.txt" )
 			}
-			exec { commandLine( "objdump", "--disassemble-all", dylib ); standardOutput = FileOutputStream( "$dylibDir/disassemble.txt" ) }
+			injected.execOps.exec { commandLine( "objdump", "--disassemble-all", dylib ); standardOutput = FileOutputStream( "$dylibDir/disassemble.txt" ) }
-			exec { commandLine( "objdump", "--full-contents", dylib ); standardOutput = FileOutputStream( "$dylibDir/full-contents.txt" ) }
+			injected.execOps.exec { commandLine( "objdump", "--full-contents", dylib ); standardOutput = FileOutputStream( "$dylibDir/full-contents.txt" ) }
 dump*/
 		}
 	}

flatlaf-natives/flatlaf-natives-macos/src/main/headers/JNIUtils.h

@@ -29,15 +29,21 @@
 #endif
 
 
+#define JNI_COCOA_TRY() \
+	@try {
+
+#define JNI_COCOA_CATCH() \
+	} @catch( NSException *ex ) { \
+		NSLog( @"Exception: %@\nReason: %@\nUser Info: %@\nStack: %@", \
+			[ex name], [ex reason], [ex userInfo], [ex callStackSymbols] ); \
+	}
+
 #define JNI_COCOA_ENTER() \
 	@autoreleasepool { \
-		@try {
+		JNI_COCOA_TRY()
 
 #define JNI_COCOA_EXIT() \
-		} @catch( NSException *ex ) { \
+		JNI_COCOA_CATCH() \
- 			NSLog( @"Exception: %@\nReason: %@\nUser Info: %@\nStack: %@", \
- 				[ex name], [ex reason], [ex userInfo], [ex callStackSymbols] ); \
- 		} \
 	}
 
 

flatlaf-natives/flatlaf-natives-macos/src/main/objcpp/MacWindow.mm

@@ -100,10 +100,13 @@ JNIEXPORT jboolean JNICALL Java_com_formdev_flatlaf_ui_FlatNativeMacLibrary_setW
 		return FALSE;
 
 	[FlatJNFRunLoop performOnMainThreadWaiting:NO withBlock:^(){
+		JNI_COCOA_TRY()
+
 		nsWindow.hasShadow = YES;
 		nsWindow.contentView.wantsLayer = YES;
 		nsWindow.contentView.layer.cornerRadius = radius;
 		nsWindow.contentView.layer.masksToBounds = YES;
+		nsWindow.contentView.layer.opaque = NO;
 
 		nsWindow.contentView.layer.borderWidth = borderWidth;
 		if( borderWidth > 0 ) {
@@ -120,6 +123,8 @@ JNIEXPORT jboolean JNICALL Java_com_formdev_flatlaf_ui_FlatNativeMacLibrary_setW
 
 		[nsWindow.contentView.layer removeAllAnimations];
 		[nsWindow invalidateShadow];
+
+		JNI_COCOA_CATCH()
 	}];
 
 	return TRUE;
@@ -157,6 +162,8 @@ JNIEXPORT jboolean JNICALL Java_com_formdev_flatlaf_ui_FlatNativeMacLibrary_setW
 	WindowData* windowData = getWindowData( nsWindow, true );
 
 	[FlatJNFRunLoop performOnMainThreadWaiting:YES withBlock:^(){
+		JNI_COCOA_TRY()
+
 //		NSLog( @"\n%@\n\n", [nsWindow.contentView.superview _subtreeDescription] );
 
 		// add/remove toolbar
@@ -235,6 +242,8 @@ JNIEXPORT jboolean JNICALL Java_com_formdev_flatlaf_ui_FlatNativeMacLibrary_setW
 				windowData.didExitFullScreenObserver = nil;
 			}
 		}
+
+		JNI_COCOA_CATCH()
 	}];
 
 	return TRUE;

flatlaf-natives/flatlaf-natives-windows/README.md

@@ -8,8 +8,8 @@ The native library can be built only on Windows and requires a C++ compiler.
 Tested with Microsoft Visual C++ (MSVC) 2019 and 2022 (comes with Visual Studio
 2019 and 2022).
 
-The native library is available for folloging CPU architectures: `x86_64` (or
+The native library is available for following CPU architectures: `x86_64` (or
-`amd64`), `x86` and `arm64`.
+`amd64`), `x86` and `arm64` (or `aarch64`).
 
 To be able to build FlatLaf on any platform, and without C++ compiler, the
 pre-built DLLs are checked into Git at

flatlaf-natives/flatlaf-natives-windows/build.gradle.kts

@@ -91,7 +91,7 @@ tasks {
 			copy {
 				from( linkedFile )
 				into( nativesDir )
-				rename( "flatlaf-natives-windows.dll", libraryName )
+				rename( linkedFile.get().asFile.name, libraryName )
 			}
 		}
 	}

flatlaf-testing/dumps/uidefaults/FlatDarkLaf_1.8.0-mac.txt

@@ -1,12 +1,11 @@
 - Java   1.8.0_202
-+ Java   1.8.0_292
++ Java   1.8.0_322
 
 - OS     Windows 10
 + OS     Mac OS X
 
 #---- ComboBox ----
 
-+ ComboBox.roundedBorderWidth    1
 + ComboBox.showPopupOnNavigation true
 
 
@@ -47,16 +46,6 @@
 + OptionPane.isYesLast           true
 
 
-#---- Popup ----
-
-+ Popup.roundedBorderWidth       1
-
-
-#---- PopupMenu ----
-
-+ PopupMenu.roundedBorderWidth   1
-
-
 #---- ProgressBar ----
 
 - ProgressBar.font               [active] Segoe UI plain 10    javax.swing.plaf.FontUIResource [UI]
@@ -88,11 +77,6 @@
 
 - TitlePane.small.font           [active] Segoe UI plain 11    javax.swing.plaf.FontUIResource [UI]
 + TitlePane.small.font           [active] Helvetica Neue plain 12    javax.swing.plaf.FontUIResource [UI]
-
-
-#---- ToolTip ----
-
-+ ToolTip.roundedBorderWidth     1
 - defaultFont                    Segoe UI plain 12    javax.swing.plaf.FontUIResource [UI]
 + defaultFont                    Helvetica Neue plain 13    javax.swing.plaf.FontUIResource [UI]
 

flatlaf-testing/dumps/uidefaults/FlatDarkLaf_1.8.0.txt

@@ -222,6 +222,7 @@ ComboBox.minimumWidth          72
 ComboBox.noActionOnKeyNavigation false
 ComboBox.padding               2,6,2,6    javax.swing.plaf.InsetsUIResource [UI]
 ComboBox.popupInsets           0,0,0,0    javax.swing.plaf.InsetsUIResource [UI]
+ComboBox.roundedBorderWidth    1
 ComboBox.selectionArc          0
 ComboBox.selectionBackground   #4b6eaf  HSL 219  40  49    javax.swing.plaf.ColorUIResource [UI]
 ComboBox.selectionForeground   #bbbbbb  HSL   0   0  73    javax.swing.plaf.ColorUIResource [UI]
@@ -744,6 +745,7 @@ Popup.dropShadowColor          #000000  HSL   0   0   0    javax.swing.plaf.Colo
 Popup.dropShadowInsets         -4,-4,4,4    javax.swing.plaf.InsetsUIResource [UI]
 Popup.dropShadowOpacity        0.25
 Popup.dropShadowPainted        true
+Popup.roundedBorderWidth       1
 
 
 #---- PopupMenu ----
@@ -757,6 +759,7 @@ PopupMenu.consumeEventOnClose  false
 PopupMenu.font                 [active] $defaultFont [UI]
 PopupMenu.foreground           #bbbbbb  HSL   0   0  73    javax.swing.plaf.ColorUIResource [UI]
 PopupMenu.hoverScrollArrowBackground #484c4e  HSL 200   4  29    javax.swing.plaf.ColorUIResource [UI]
+PopupMenu.roundedBorderWidth   1
 PopupMenu.scrollArrowColor     #9b9b9b  HSL   0   0  61    javax.swing.plaf.ColorUIResource [UI]
 
 
@@ -1375,6 +1378,7 @@ ToolTip.border                 [lazy] 4,6,4,6  false    com.formdev.flatlaf.ui.F
 ToolTip.borderCornerRadius     4
 ToolTip.font                   [active] $defaultFont [UI]
 ToolTip.foreground             #bbbbbb  HSL   0   0  73    javax.swing.plaf.ColorUIResource [UI]
+ToolTip.roundedBorderWidth     1
 
 
 #---- ToolTipManager ----
@@ -1431,6 +1435,7 @@ Tree.showDefaultIcons          false
 Tree.textBackground            #46494b  HSL 204   3  28    javax.swing.plaf.ColorUIResource [UI]
 Tree.textForeground            #bbbbbb  HSL   0   0  73    javax.swing.plaf.ColorUIResource [UI]
 Tree.timeFactor                1000
+Tree.wideCellRenderer          false
 Tree.wideSelection             true
 TreeUI                         com.formdev.flatlaf.ui.FlatTreeUI
 

flatlaf-testing/dumps/uidefaults/FlatLightLaf_1.8.0-mac.txt

@@ -1,12 +1,14 @@
 - Java   1.8.0_202
-+ Java   1.8.0_292
++ Java   1.8.0_322
 
 - OS     Windows 10
 + OS     Mac OS X
 
 #---- ComboBox ----
 
+- ComboBox.roundedBorderWidth    1
 + ComboBox.roundedBorderWidth    0
+
 + ComboBox.showPopupOnNavigation true
 
 
@@ -49,11 +51,13 @@
 
 #---- Popup ----
 
+- Popup.roundedBorderWidth       1
 + Popup.roundedBorderWidth       0
 
 
 #---- PopupMenu ----
 
+- PopupMenu.roundedBorderWidth   1
 + PopupMenu.roundedBorderWidth   0
 
 
@@ -92,6 +96,7 @@
 
 #---- ToolTip ----
 
+- ToolTip.roundedBorderWidth     1
 + ToolTip.roundedBorderWidth     0
 - defaultFont                    Segoe UI plain 12    javax.swing.plaf.FontUIResource [UI]
 + defaultFont                    Helvetica Neue plain 13    javax.swing.plaf.FontUIResource [UI]

flatlaf-testing/dumps/uidefaults/FlatLightLaf_1.8.0.txt

@@ -226,6 +226,7 @@ ComboBox.minimumWidth          72
 ComboBox.noActionOnKeyNavigation false
 ComboBox.padding               2,6,2,6    javax.swing.plaf.InsetsUIResource [UI]
 ComboBox.popupInsets           0,0,0,0    javax.swing.plaf.InsetsUIResource [UI]
+ComboBox.roundedBorderWidth    1
 ComboBox.selectionArc          0
 ComboBox.selectionBackground   #2675bf  HSL 209  67  45    javax.swing.plaf.ColorUIResource [UI]
 ComboBox.selectionForeground   #ffffff  HSL   0   0 100    javax.swing.plaf.ColorUIResource [UI]
@@ -749,6 +750,7 @@ Popup.dropShadowColor          #000000  HSL   0   0   0    javax.swing.plaf.Colo
 Popup.dropShadowInsets         -4,-4,4,4    javax.swing.plaf.InsetsUIResource [UI]
 Popup.dropShadowOpacity        0.15
 Popup.dropShadowPainted        true
+Popup.roundedBorderWidth       1
 
 
 #---- PopupMenu ----
@@ -762,6 +764,7 @@ PopupMenu.consumeEventOnClose  false
 PopupMenu.font                 [active] $defaultFont [UI]
 PopupMenu.foreground           #000000  HSL   0   0   0    javax.swing.plaf.ColorUIResource [UI]
 PopupMenu.hoverScrollArrowBackground #e5e5e5  HSL   0   0  90    javax.swing.plaf.ColorUIResource [UI]
+PopupMenu.roundedBorderWidth   1
 PopupMenu.scrollArrowColor     #666666  HSL   0   0  40    javax.swing.plaf.ColorUIResource [UI]
 
 
@@ -1380,6 +1383,7 @@ ToolTip.border                 [lazy] 4,6,4,6  false    com.formdev.flatlaf.ui.F
 ToolTip.borderCornerRadius     4
 ToolTip.font                   [active] $defaultFont [UI]
 ToolTip.foreground             #000000  HSL   0   0   0    javax.swing.plaf.ColorUIResource [UI]
+ToolTip.roundedBorderWidth     1
 
 
 #---- ToolTipManager ----
@@ -1436,6 +1440,7 @@ Tree.showDefaultIcons          false
 Tree.textBackground            #ffffff  HSL   0   0 100    javax.swing.plaf.ColorUIResource [UI]
 Tree.textForeground            #000000  HSL   0   0   0    javax.swing.plaf.ColorUIResource [UI]
 Tree.timeFactor                1000
+Tree.wideCellRenderer          false
 Tree.wideSelection             true
 TreeUI                         com.formdev.flatlaf.ui.FlatTreeUI
 

flatlaf-testing/dumps/uidefaults/FlatMacDarkLaf_1.8.0.txt

@@ -228,6 +228,7 @@ ComboBox.noActionOnKeyNavigation false
 ComboBox.padding               2,6,2,6    javax.swing.plaf.InsetsUIResource [UI]
 ComboBox.popupBackground       #323232  HSL   0   0  20    javax.swing.plaf.ColorUIResource [UI]
 ComboBox.popupInsets           5,0,5,0    javax.swing.plaf.InsetsUIResource [UI]
+ComboBox.roundedBorderWidth    1
 ComboBox.selectionArc          8
 ComboBox.selectionBackground   #1458b8  HSL 215  80  40    javax.swing.plaf.ColorUIResource [UI]
 ComboBox.selectionForeground   #ffffff  HSL   0   0 100    javax.swing.plaf.ColorUIResource [UI]
@@ -752,6 +753,7 @@ Popup.dropShadowColor          #000000  HSL   0   0   0    javax.swing.plaf.Colo
 Popup.dropShadowInsets         -4,-4,4,4    javax.swing.plaf.InsetsUIResource [UI]
 Popup.dropShadowOpacity        0.25
 Popup.dropShadowPainted        true
+Popup.roundedBorderWidth       1
 
 
 #---- PopupMenu ----
@@ -765,6 +767,7 @@ PopupMenu.consumeEventOnClose  false
 PopupMenu.font                 [active] $defaultFont [UI]
 PopupMenu.foreground           #dddddd  HSL   0   0  87    javax.swing.plaf.ColorUIResource [UI]
 PopupMenu.hoverScrollArrowBackground #2b2b2b  HSL   0   0  17    javax.swing.plaf.ColorUIResource [UI]
+PopupMenu.roundedBorderWidth   1
 PopupMenu.scrollArrowColor     #b7b7b7  HSL   0   0  72    javax.swing.plaf.ColorUIResource [UI]
 
 
@@ -1385,6 +1388,7 @@ ToolTip.border                 [lazy] 4,6,4,6  false    com.formdev.flatlaf.ui.F
 ToolTip.borderCornerRadius     4
 ToolTip.font                   [active] $defaultFont [UI]
 ToolTip.foreground             #dddddd  HSL   0   0  87    javax.swing.plaf.ColorUIResource [UI]
+ToolTip.roundedBorderWidth     1
 
 
 #---- ToolTipManager ----
@@ -1441,6 +1445,7 @@ Tree.showDefaultIcons          false
 Tree.textBackground            #282828  HSL   0   0  16    javax.swing.plaf.ColorUIResource [UI]
 Tree.textForeground            #dddddd  HSL   0   0  87    javax.swing.plaf.ColorUIResource [UI]
 Tree.timeFactor                1000
+Tree.wideCellRenderer          false
 Tree.wideSelection             true
 TreeUI                         com.formdev.flatlaf.ui.FlatTreeUI
 

flatlaf-testing/dumps/uidefaults/FlatMacLightLaf_1.8.0.txt

@@ -232,6 +232,7 @@ ComboBox.noActionOnKeyNavigation false
 ComboBox.padding               2,6,2,6    javax.swing.plaf.InsetsUIResource [UI]
 ComboBox.popupBackground       #ececec  HSL   0   0  93    javax.swing.plaf.ColorUIResource [UI]
 ComboBox.popupInsets           5,0,5,0    javax.swing.plaf.InsetsUIResource [UI]
+ComboBox.roundedBorderWidth    1
 ComboBox.selectionArc          8
 ComboBox.selectionBackground   #3d9aff  HSL 211 100  62    javax.swing.plaf.ColorUIResource [UI]
 ComboBox.selectionForeground   #ffffff  HSL   0   0 100    javax.swing.plaf.ColorUIResource [UI]
@@ -756,6 +757,7 @@ Popup.dropShadowColor          #000000  HSL   0   0   0    javax.swing.plaf.Colo
 Popup.dropShadowInsets         -4,-4,4,4    javax.swing.plaf.InsetsUIResource [UI]
 Popup.dropShadowOpacity        0.15
 Popup.dropShadowPainted        true
+Popup.roundedBorderWidth       1
 
 
 #---- PopupMenu ----
@@ -769,6 +771,7 @@ PopupMenu.consumeEventOnClose  false
 PopupMenu.font                 [active] $defaultFont [UI]
 PopupMenu.foreground           #262626  HSL   0   0  15    javax.swing.plaf.ColorUIResource [UI]
 PopupMenu.hoverScrollArrowBackground #e9e9e9  HSL   0   0  91    javax.swing.plaf.ColorUIResource [UI]
+PopupMenu.roundedBorderWidth   1
 PopupMenu.scrollArrowColor     #7d7d7d  HSL   0   0  49    javax.swing.plaf.ColorUIResource [UI]
 
 
@@ -1389,6 +1392,7 @@ ToolTip.border                 [lazy] 4,6,4,6  false    com.formdev.flatlaf.ui.F
 ToolTip.borderCornerRadius     4
 ToolTip.font                   [active] $defaultFont [UI]
 ToolTip.foreground             #262626  HSL   0   0  15    javax.swing.plaf.ColorUIResource [UI]
+ToolTip.roundedBorderWidth     1
 
 
 #---- ToolTipManager ----
@@ -1445,6 +1449,7 @@ Tree.showDefaultIcons          false
 Tree.textBackground            #ffffff  HSL   0   0 100    javax.swing.plaf.ColorUIResource [UI]
 Tree.textForeground            #262626  HSL   0   0  15    javax.swing.plaf.ColorUIResource [UI]
 Tree.timeFactor                1000
+Tree.wideCellRenderer          false
 Tree.wideSelection             true
 TreeUI                         com.formdev.flatlaf.ui.FlatTreeUI
 

flatlaf-testing/dumps/uidefaults/FlatTestLaf_1.8.0.txt

@@ -254,6 +254,7 @@ ComboBox.noActionOnKeyNavigation false
 ComboBox.padding               2,6,2,6    javax.swing.plaf.InsetsUIResource [UI]
 ComboBox.popupBackground       #ffffcc  HSL  60 100  90    javax.swing.plaf.ColorUIResource [UI]
 ComboBox.popupInsets           0,0,0,0    javax.swing.plaf.InsetsUIResource [UI]
+ComboBox.roundedBorderWidth    1
 ComboBox.selectionArc          0
 ComboBox.selectionBackground   #00aa00  HSL 120 100  33    javax.swing.plaf.ColorUIResource [UI]
 ComboBox.selectionForeground   #ffff00  HSL  60 100  50    javax.swing.plaf.ColorUIResource [UI]
@@ -782,6 +783,7 @@ Popup.dropShadowColor          #00ff00  HSL 120 100  50    javax.swing.plaf.Colo
 Popup.dropShadowInsets         -6,6,6,6    javax.swing.plaf.InsetsUIResource [UI]
 Popup.dropShadowOpacity        0.5
 Popup.dropShadowPainted        true
+Popup.roundedBorderWidth       1
 
 
 #---- PopupMenu ----
@@ -795,6 +797,7 @@ PopupMenu.consumeEventOnClose  false
 PopupMenu.font                 [active] $defaultFont [UI]
 PopupMenu.foreground           #ff0000  HSL   0 100  50    javax.swing.plaf.ColorUIResource [UI]
 PopupMenu.hoverScrollArrowBackground #00ff00  HSL 120 100  50    javax.swing.plaf.ColorUIResource [UI]
+PopupMenu.roundedBorderWidth   1
 PopupMenu.scrollArrowColor     #0000ff  HSL 240 100  50    javax.swing.plaf.ColorUIResource [UI]
 
 
@@ -1438,6 +1441,7 @@ ToolTip.border                 [lazy] line: #000000  HSL   0   0   0    java.awt
 ToolTip.borderCornerRadius     4
 ToolTip.font                   [active] $defaultFont [UI]
 ToolTip.foreground             #ff0000  HSL   0 100  50    javax.swing.plaf.ColorUIResource [UI]
+ToolTip.roundedBorderWidth     1
 
 
 #---- ToolTipManager ----
@@ -1495,6 +1499,7 @@ Tree.showDefaultIcons          false
 Tree.textBackground            #fff0ff  HSL 300 100  97    javax.swing.plaf.ColorUIResource [UI]
 Tree.textForeground            #ff0000  HSL   0 100  50    javax.swing.plaf.ColorUIResource [UI]
 Tree.timeFactor                1000
+Tree.wideCellRenderer          false
 Tree.wideSelection             true
 TreeUI                         com.formdev.flatlaf.ui.FlatTreeUI
 

flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatComponentStateTest.java

@@ -198,17 +198,17 @@ public class FlatComponentStateTest
 
 		//---- label11 ----
 		label11.setText("JButton");
-		label11.putClientProperty("FlatLaf.styleClass", "h3");
+		label11.putClientProperty(FlatClientProperties.STYLE_CLASS, "h3");
 		add(label11, "cell 1 0 2 1");
 
 		//---- label12 ----
 		label12.setText("JToggleButton");
-		label12.putClientProperty("FlatLaf.styleClass", "h3");
+		label12.putClientProperty(FlatClientProperties.STYLE_CLASS, "h3");
 		add(label12, "cell 5 0 3 1");
 
 		//---- label32 ----
 		label32.setText("Help Button");
-		label32.putClientProperty("FlatLaf.styleClass", "h3");
+		label32.putClientProperty(FlatClientProperties.STYLE_CLASS, "h3");
 		add(label32, "cell 9 0 2 1");
 
 		//---- label5 ----
@@ -257,26 +257,26 @@ public class FlatComponentStateTest
 
 		//---- testStateButton1 ----
 		testStateButton1.setText("text");
-		testStateButton1.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton1.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
 		add(testStateButton1, "cell 1 2");
 
 		//---- testStateButton7 ----
 		testStateButton7.setText("text");
 		testStateButton7.setStateDefault(true);
-		testStateButton7.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton7.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
 		add(testStateButton7, "cell 2 2");
 
 		//---- testStateButton4 ----
 		testStateButton4.setText("text");
 		testStateButton4.setStateFocused(true);
-		testStateButton4.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton4.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
 		add(testStateButton4, "cell 3 2");
 
 		//---- testStateButton10 ----
 		testStateButton10.setText("text");
 		testStateButton10.setStateFocused(true);
 		testStateButton10.setStateDefault(true);
-		testStateButton10.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton10.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
 		add(testStateButton10, "cell 4 2");
 
 		//---- testStateToggleButton1 ----
@@ -300,14 +300,14 @@ public class FlatComponentStateTest
 		add(testStateToggleButton12, "cell 8 2");
 
 		//---- testStateButton15 ----
-		testStateButton15.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton15.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
-		testStateButton15.putClientProperty("JButton.buttonType", "help");
+		testStateButton15.putClientProperty(FlatClientProperties.BUTTON_TYPE, FlatClientProperties.BUTTON_TYPE_HELP);
 		add(testStateButton15, "cell 9 2");
 
 		//---- testStateButton19 ----
 		testStateButton19.setStateFocused(true);
-		testStateButton19.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton19.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
-		testStateButton19.putClientProperty("JButton.buttonType", "help");
+		testStateButton19.putClientProperty(FlatClientProperties.BUTTON_TYPE, FlatClientProperties.BUTTON_TYPE_HELP);
 		add(testStateButton19, "cell 10 2");
 
 		//---- label2 ----
@@ -317,21 +317,21 @@ public class FlatComponentStateTest
 		//---- testStateButton2 ----
 		testStateButton2.setText("text");
 		testStateButton2.setStateHover(true);
-		testStateButton2.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton2.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
 		add(testStateButton2, "cell 1 3");
 
 		//---- testStateButton8 ----
 		testStateButton8.setText("text");
 		testStateButton8.setStateHover(true);
 		testStateButton8.setStateDefault(true);
-		testStateButton8.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton8.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
 		add(testStateButton8, "cell 2 3");
 
 		//---- testStateButton5 ----
 		testStateButton5.setText("text");
 		testStateButton5.setStateHover(true);
 		testStateButton5.setStateFocused(true);
-		testStateButton5.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton5.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
 		add(testStateButton5, "cell 3 3");
 
 		//---- testStateButton11 ----
@@ -339,7 +339,7 @@ public class FlatComponentStateTest
 		testStateButton11.setStateHover(true);
 		testStateButton11.setStateFocused(true);
 		testStateButton11.setStateDefault(true);
-		testStateButton11.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton11.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
 		add(testStateButton11, "cell 4 3");
 
 		//---- testStateToggleButton2 ----
@@ -368,15 +368,15 @@ public class FlatComponentStateTest
 
 		//---- testStateButton16 ----
 		testStateButton16.setStateHover(true);
-		testStateButton16.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton16.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
-		testStateButton16.putClientProperty("JButton.buttonType", "help");
+		testStateButton16.putClientProperty(FlatClientProperties.BUTTON_TYPE, FlatClientProperties.BUTTON_TYPE_HELP);
 		add(testStateButton16, "cell 9 3");
 
 		//---- testStateButton20 ----
 		testStateButton20.setStateHover(true);
 		testStateButton20.setStateFocused(true);
-		testStateButton20.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton20.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
-		testStateButton20.putClientProperty("JButton.buttonType", "help");
+		testStateButton20.putClientProperty(FlatClientProperties.BUTTON_TYPE, FlatClientProperties.BUTTON_TYPE_HELP);
 		add(testStateButton20, "cell 10 3");
 
 		//---- label3 ----
@@ -386,21 +386,21 @@ public class FlatComponentStateTest
 		//---- testStateButton3 ----
 		testStateButton3.setText("text");
 		testStateButton3.setStatePressed(true);
-		testStateButton3.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton3.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
 		add(testStateButton3, "cell 1 4");
 
 		//---- testStateButton9 ----
 		testStateButton9.setText("text");
 		testStateButton9.setStatePressed(true);
 		testStateButton9.setStateDefault(true);
-		testStateButton9.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton9.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
 		add(testStateButton9, "cell 2 4");
 
 		//---- testStateButton6 ----
 		testStateButton6.setText("text");
 		testStateButton6.setStatePressed(true);
 		testStateButton6.setStateFocused(true);
-		testStateButton6.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton6.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
 		add(testStateButton6, "cell 3 4");
 
 		//---- testStateButton12 ----
@@ -408,7 +408,7 @@ public class FlatComponentStateTest
 		testStateButton12.setStatePressed(true);
 		testStateButton12.setStateFocused(true);
 		testStateButton12.setStateDefault(true);
-		testStateButton12.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton12.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
 		add(testStateButton12, "cell 4 4");
 
 		//---- testStateToggleButton3 ----
@@ -437,15 +437,15 @@ public class FlatComponentStateTest
 
 		//---- testStateButton17 ----
 		testStateButton17.setStatePressed(true);
-		testStateButton17.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton17.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
-		testStateButton17.putClientProperty("JButton.buttonType", "help");
+		testStateButton17.putClientProperty(FlatClientProperties.BUTTON_TYPE, FlatClientProperties.BUTTON_TYPE_HELP);
 		add(testStateButton17, "cell 9 4");
 
 		//---- testStateButton21 ----
 		testStateButton21.setStatePressed(true);
 		testStateButton21.setStateFocused(true);
-		testStateButton21.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton21.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
-		testStateButton21.putClientProperty("JButton.buttonType", "help");
+		testStateButton21.putClientProperty(FlatClientProperties.BUTTON_TYPE, FlatClientProperties.BUTTON_TYPE_HELP);
 		add(testStateButton21, "cell 10 4");
 
 		//---- label4 ----
@@ -455,14 +455,14 @@ public class FlatComponentStateTest
 		//---- testStateButton13 ----
 		testStateButton13.setText("text");
 		testStateButton13.setEnabled(false);
-		testStateButton13.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton13.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
 		add(testStateButton13, "cell 1 5");
 
 		//---- testStateButton14 ----
 		testStateButton14.setText("text");
 		testStateButton14.setEnabled(false);
 		testStateButton14.setStateDefault(true);
-		testStateButton14.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton14.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
 		add(testStateButton14, "cell 2 5");
 
 		//---- testStateToggleButton4 ----
@@ -478,8 +478,8 @@ public class FlatComponentStateTest
 
 		//---- testStateButton18 ----
 		testStateButton18.setEnabled(false);
-		testStateButton18.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton18.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
-		testStateButton18.putClientProperty("JButton.buttonType", "help");
+		testStateButton18.putClientProperty(FlatClientProperties.BUTTON_TYPE, FlatClientProperties.BUTTON_TYPE_HELP);
 		add(testStateButton18, "cell 9 5");
 
 		//---- label10 ----
@@ -488,12 +488,12 @@ public class FlatComponentStateTest
 
 		//---- button1 ----
 		button1.setText("text");
-		button1.putClientProperty("JComponent.minimumWidth", 0);
+		button1.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
 		add(button1, "cell 1 6");
 
 		//---- testDefaultButton1 ----
 		testDefaultButton1.setText("text");
-		testDefaultButton1.putClientProperty("JComponent.minimumWidth", 0);
+		testDefaultButton1.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
 		add(testDefaultButton1, "cell 2 6");
 
 		//---- toggleButton1 ----
@@ -506,19 +506,19 @@ public class FlatComponentStateTest
 		add(toggleButton2, "cell 6 6");
 
 		//---- button2 ----
-		button2.putClientProperty("JComponent.minimumWidth", 0);
+		button2.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
-		button2.putClientProperty("JButton.buttonType", "help");
+		button2.putClientProperty(FlatClientProperties.BUTTON_TYPE, FlatClientProperties.BUTTON_TYPE_HELP);
 		add(button2, "cell 9 6");
 		add(separator1, "cell 0 7 11 1");
 
 		//---- label22 ----
 		label22.setText("JCheckBox");
-		label22.putClientProperty("FlatLaf.styleClass", "h3");
+		label22.putClientProperty(FlatClientProperties.STYLE_CLASS, "h3");
 		add(label22, "cell 1 8 2 1");
 
 		//---- label27 ----
 		label27.setText("JRadioButton");
-		label27.putClientProperty("FlatLaf.styleClass", "h3");
+		label27.putClientProperty(FlatClientProperties.STYLE_CLASS, "h3");
 		add(label27, "cell 5 8 2 1");
 
 		//---- label23 ----

flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatComponents2Test.java

@@ -16,6 +16,7 @@
 
 package com.formdev.flatlaf.testing;
 
+import java.awt.BorderLayout;
 import java.awt.Color;
 import java.awt.Component;
 import java.awt.ComponentOrientation;
@@ -32,6 +33,7 @@ import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Random;
+import java.util.function.Supplier;
 import javax.swing.*;
 import javax.swing.border.*;
 import javax.swing.event.TableModelEvent;
@@ -492,53 +494,33 @@ public class FlatComponents2Test
 			list.setVisibleRowCount( visibleRowCount );
 	}
 
+	private void listAlternatingRowsChanged() {
+		UIManager.put( "List.alternateRowColor", listAlternatingRowsCheckBox.isSelected() ? Color.YELLOW : null );
+		FlatLaf.updateUILater();
+	}
+
 	private void treeRendererChanged() {
 		Object sel = treeRendererComboBox.getSelectedItem();
 		if( !(sel instanceof String) )
 			return;
 
-		JTree[] trees = { tree1, tree2, xTree1 };
+		Supplier<TreeCellRenderer> creator;
 		switch( (String) sel ) {
-			case "default":
+			default:
-				for( JTree tree : trees )
+			case "default":				creator = DefaultTreeCellRenderer::new; break;
-					tree.setCellRenderer( new DefaultTreeCellRenderer() );
+			case "defaultSubclass":		creator = TestDefaultTreeCellRenderer::new; break;
-				break;
+			case "defaultWithIcons":	creator = TestDefaultWithIconsTreeCellRenderer::new; break;
-
+			case "defaultWithIcon":		creator = TestDefaultWithIconTreeCellRenderer::new; break;
-			case "defaultSubclass":
+			case "label":				creator = TestLabelTreeCellRenderer::new; break;
-				for( JTree tree : trees )
+			case "wide":				creator = TestWideTreeCellRenderer::new; break;
-					tree.setCellRenderer( new TestDefaultTreeCellRenderer() );
+			case "swingxDefault":		creator = DefaultTreeRenderer::new; break;
-				break;
+			case "jideCheckBox":		creator = () -> new CheckBoxTreeCellRenderer( new DefaultTreeCellRenderer() ); break;
-
+			case "jideStyled":			creator = StyledTreeCellRenderer::new; break;
-			case "defaultWithIcons":
-				for( JTree tree : trees )
-					tree.setCellRenderer( new TestDefaultWithIconsTreeCellRenderer() );
-				break;
-
-			case "defaultWithIcon":
-				for( JTree tree : trees )
-					tree.setCellRenderer( new TestDefaultWithIconTreeCellRenderer() );
-				break;
-
-			case "label":
-				for( JTree tree : trees )
-					tree.setCellRenderer( new TestLabelTreeCellRenderer() );
-				break;
-
-			case "swingxDefault":
-				for( JTree tree : trees )
-					tree.setCellRenderer( new DefaultTreeRenderer() );
-				break;
-
-			case "jideCheckBox":
-				for( JTree tree : trees )
-					tree.setCellRenderer( new CheckBoxTreeCellRenderer( new DefaultTreeCellRenderer() ) );
-				break;
-
-			case "jideStyled":
-				for( JTree tree : trees )
-					tree.setCellRenderer( new StyledTreeCellRenderer() );
-				break;
 		}
+
+		JTree[] trees = { tree1, tree2, xTree1 };
+		for( JTree tree : trees )
+			tree.setCellRenderer( creator.get() );
 	}
 
 	private void treeWideSelectionChanged() {
@@ -547,6 +529,17 @@ public class FlatComponents2Test
 			tree.putClientProperty( FlatClientProperties.TREE_WIDE_SELECTION, wideSelection );
 	}
 
+	private void treeWideCellRendererChanged() {
+		boolean wideCellRenderer = treeWideCellRendererCheckBox.isSelected();
+		for( JTree tree : allTrees )
+			tree.putClientProperty( FlatClientProperties.TREE_WIDE_CELL_RENDERER, wideCellRenderer );
+	}
+
+	private void treeAlternatingRowsChanged() {
+		UIManager.put( "Tree.alternateRowColor", treeAlternatingRowsCheckBox.isSelected() ? Color.cyan : null );
+		FlatLaf.updateUILater();
+	}
+
 	private void treePaintSelectionChanged() {
 		boolean paintSelection = treePaintSelectionCheckBox.isSelected();
 		for( JTree tree : allTrees )
@@ -687,11 +680,14 @@ public class FlatComponents2Test
 		listLayoutOrientationField = new JComboBox<>();
 		JLabel listVisibleRowCountLabel = new JLabel();
 		listVisibleRowCountSpinner = new JSpinner();
+		listAlternatingRowsCheckBox = new JCheckBox();
 		treeOptionsPanel = new JPanel();
 		JLabel treeRendererLabel = new JLabel();
 		treeRendererComboBox = new JComboBox<>();
 		treeWideSelectionCheckBox = new JCheckBox();
+		treeWideCellRendererCheckBox = new JCheckBox();
 		treePaintSelectionCheckBox = new JCheckBox();
+		treeAlternatingRowsCheckBox = new JCheckBox();
 		treePaintLinesCheckBox = new JCheckBox();
 		treeRedLinesCheckBox = new JCheckBox();
 		treeEditableCheckBox = new JCheckBox();
@@ -753,7 +749,7 @@ public class FlatComponents2Test
 				// rows
 				"[]" +
 				"[grow]" +
-				"[]" +
+				"[]0" +
 				"[]"));
 
 			//---- listLabel ----
@@ -796,7 +792,7 @@ public class FlatComponents2Test
 				// rows
 				"[]" +
 				"[grow]" +
-				"[]" +
+				"[]0" +
 				"[]"));
 
 			//---- tableLabel ----
@@ -833,7 +829,7 @@ public class FlatComponents2Test
 				// rows
 				"[]" +
 				"[grow]" +
-				"[]" +
+				"[]0" +
 				"[]"));
 
 			//---- treeLabel ----
@@ -1022,6 +1018,7 @@ public class FlatComponents2Test
 				// rows
 				"[]" +
 				"[]" +
+				"[]" +
 				"[]"));
 
 			//---- listRendererLabel ----
@@ -1059,6 +1056,11 @@ public class FlatComponents2Test
 			listVisibleRowCountSpinner.setModel(new SpinnerNumberModel(8, 0, null, 1));
 			listVisibleRowCountSpinner.addChangeListener(e -> listVisibleRowCountChanged());
 			listOptionsPanel.add(listVisibleRowCountSpinner, "cell 1 2");
+
+			//---- listAlternatingRowsCheckBox ----
+			listAlternatingRowsCheckBox.setText("alternating rows");
+			listAlternatingRowsCheckBox.addActionListener(e -> listAlternatingRowsChanged());
+			listOptionsPanel.add(listAlternatingRowsCheckBox, "cell 0 3 2 1,alignx left,growx 0");
 		}
 		add(listOptionsPanel, "cell 0 4 4 1");
 
@@ -1088,6 +1090,7 @@ public class FlatComponents2Test
 				"defaultWithIcons",
 				"defaultWithIcon",
 				"label",
+				"wide",
 				"swingxDefault",
 				"jideCheckBox",
 				"jideStyled"
@@ -1100,12 +1103,22 @@ public class FlatComponents2Test
 			treeWideSelectionCheckBox.addActionListener(e -> treeWideSelectionChanged());
 			treeOptionsPanel.add(treeWideSelectionCheckBox, "cell 0 1");
 
+			//---- treeWideCellRendererCheckBox ----
+			treeWideCellRendererCheckBox.setText("wide cell renderer");
+			treeWideCellRendererCheckBox.addActionListener(e -> treeWideCellRendererChanged());
+			treeOptionsPanel.add(treeWideCellRendererCheckBox, "cell 0 1");
+
 			//---- treePaintSelectionCheckBox ----
 			treePaintSelectionCheckBox.setText("paint selection");
 			treePaintSelectionCheckBox.setSelected(true);
 			treePaintSelectionCheckBox.addActionListener(e -> treePaintSelectionChanged());
 			treeOptionsPanel.add(treePaintSelectionCheckBox, "cell 0 2");
 
+			//---- treeAlternatingRowsCheckBox ----
+			treeAlternatingRowsCheckBox.setText("alternating rows");
+			treeAlternatingRowsCheckBox.addActionListener(e -> treeAlternatingRowsChanged());
+			treeOptionsPanel.add(treeAlternatingRowsCheckBox, "cell 0 2");
+
 			//---- treePaintLinesCheckBox ----
 			treePaintLinesCheckBox.setText("paint lines");
 			treePaintLinesCheckBox.addActionListener(e -> treePaintLinesChanged());
@@ -1263,10 +1276,13 @@ public class FlatComponents2Test
 	private JComboBox<String> listRendererComboBox;
 	private JComboBox<String> listLayoutOrientationField;
 	private JSpinner listVisibleRowCountSpinner;
+	private JCheckBox listAlternatingRowsCheckBox;
 	private JPanel treeOptionsPanel;
 	private JComboBox<String> treeRendererComboBox;
 	private JCheckBox treeWideSelectionCheckBox;
+	private JCheckBox treeWideCellRendererCheckBox;
 	private JCheckBox treePaintSelectionCheckBox;
+	private JCheckBox treeAlternatingRowsCheckBox;
 	private JCheckBox treePaintLinesCheckBox;
 	private JCheckBox treeRedLinesCheckBox;
 	private JCheckBox treeEditableCheckBox;
@@ -1372,7 +1388,7 @@ public class FlatComponents2Test
 		@Override
 		public String getElementAt( int index ) {
 			return (index < 20)
-				? "item " + (index + 1)
+				? "item " + (index + 1) + ((index + 1) % 5 == 0 ? " ####" : "")
 				: "item " + (index + 1) + "   " + randomRowString( index );
 		}
 	}
@@ -1794,6 +1810,32 @@ public class FlatComponents2Test
 		}
 	}
 
+	//---- class TestLabelTreeCellRenderer ------------------------------------
+
+	private static class TestWideTreeCellRenderer
+		extends JPanel
+		implements TreeCellRenderer
+	{
+		private final JLabel label = new JLabel();
+		private final JLabel icon = new JLabel( UIManager.getIcon( "FileView.floppyDriveIcon" ) );
+
+		TestWideTreeCellRenderer() {
+			super( new BorderLayout() );
+			setOpaque( false );
+			add( label, BorderLayout.CENTER );
+			add( icon, BorderLayout.LINE_END );
+			setBorder( new LineBorder( Color.red ) );
+		}
+
+		@Override
+		public Component getTreeCellRendererComponent( JTree tree, Object value, boolean selected, boolean expanded,
+			boolean leaf, int row, boolean hasFocus )
+		{
+			label.setText( String.valueOf( value ) );
+			return this;
+		}
+	}
+
 	//---- class TestComboBoxTableCellRenderer --------------------------------
 
 	private static class TestComboBoxTableCellRenderer

flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatComponents2Test.jfd

@@ -1,4 +1,4 @@
-JFDML JFormDesigner: "8.2.2.0.9999" Java: "21.0.1" encoding: "UTF-8"
+JFDML JFormDesigner: "8.3" encoding: "UTF-8"
 
 new FormModel {
 	contentType: "form/swing"
@@ -33,7 +33,7 @@ new FormModel {
 			} )
 			add( new FormContainer( "javax.swing.JPanel", new FormLayoutManager( class net.miginfocom.swing.MigLayout ) {
 				"$columnConstraints": "[fill]"
-				"$rowConstraints": "[][grow][][]"
+				"$rowConstraints": "[][grow][]0[]"
 				"$layoutConstraints": "ltr,insets 0,hidemode 3"
 			} ) {
 				name: "panel1"
@@ -95,7 +95,7 @@ new FormModel {
 			add( new FormContainer( "javax.swing.JPanel", new FormLayoutManager( class net.miginfocom.swing.MigLayout ) {
 				"$layoutConstraints": "insets 0,hidemode 3"
 				"$columnConstraints": "[fill]"
-				"$rowConstraints": "[][grow][][]"
+				"$rowConstraints": "[][grow][]0[]"
 			} ) {
 				name: "panel3"
 				"$client.FlatLaf.internal.testing.ignore": true
@@ -146,7 +146,7 @@ new FormModel {
 			add( new FormContainer( "javax.swing.JPanel", new FormLayoutManager( class net.miginfocom.swing.MigLayout ) {
 				"$layoutConstraints": "insets 0,hidemode 3"
 				"$columnConstraints": "[fill]"
-				"$rowConstraints": "[][grow][][]"
+				"$rowConstraints": "[][grow][]0[]"
 			} ) {
 				name: "panel2"
 				"$client.FlatLaf.internal.testing.ignore": true
@@ -385,7 +385,7 @@ new FormModel {
 			add( new FormContainer( "javax.swing.JPanel", new FormLayoutManager( class net.miginfocom.swing.MigLayout ) {
 				"$layoutConstraints": "insets 8,hidemode 3"
 				"$columnConstraints": "[fill][fill]"
-				"$rowConstraints": "[][][]"
+				"$rowConstraints": "[][][][]"
 			} ) {
 				name: "listOptionsPanel"
 				"border": new javax.swing.border.TitledBorder( "JList Control" )
@@ -455,6 +455,16 @@ new FormModel {
 				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 					"value": "cell 1 2"
 				} )
+				add( new FormComponent( "javax.swing.JCheckBox" ) {
+					name: "listAlternatingRowsCheckBox"
+					"text": "alternating rows"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+					addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "listAlternatingRowsChanged", false ) )
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 3 2 1,alignx left,growx 0"
+				} )
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 				"value": "cell 0 4 4 1"
 			} )
@@ -484,6 +494,7 @@ new FormModel {
 						addElement( "defaultWithIcons" )
 						addElement( "defaultWithIcon" )
 						addElement( "label" )
+						addElement( "wide" )
 						addElement( "swingxDefault" )
 						addElement( "jideCheckBox" )
 						addElement( "jideStyled" )
@@ -505,6 +516,16 @@ new FormModel {
 				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 					"value": "cell 0 1"
 				} )
+				add( new FormComponent( "javax.swing.JCheckBox" ) {
+					name: "treeWideCellRendererCheckBox"
+					"text": "wide cell renderer"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+					addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "treeWideCellRendererChanged", false ) )
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 1"
+				} )
 				add( new FormComponent( "javax.swing.JCheckBox" ) {
 					name: "treePaintSelectionCheckBox"
 					"text": "paint selection"
@@ -516,6 +537,16 @@ new FormModel {
 				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 					"value": "cell 0 2"
 				} )
+				add( new FormComponent( "javax.swing.JCheckBox" ) {
+					name: "treeAlternatingRowsCheckBox"
+					"text": "alternating rows"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+					addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "treeAlternatingRowsChanged", false ) )
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 2"
+				} )
 				add( new FormComponent( "javax.swing.JCheckBox" ) {
 					name: "treePaintLinesCheckBox"
 					"text": "paint lines"

flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatComponentsTest.java

@@ -20,6 +20,7 @@ import java.awt.*;
 import javax.swing.*;
 import javax.swing.border.*;
 import javax.swing.event.ChangeListener;
+import javax.swing.plaf.ColorUIResource;
 import com.formdev.flatlaf.FlatClientProperties;
 import com.formdev.flatlaf.extras.components.*;
 import com.formdev.flatlaf.extras.components.FlatButton.ButtonType;
@@ -144,6 +145,36 @@ public class FlatComponentsTest
 		}
 	}
 
+	private void transparentBackground() {
+		EventQueue.invokeLater( () -> {
+			boolean transparent = transparentBackgroundCheckBox.isSelected();
+			Color transparentColor = new Color( 0, true );
+			ColorUIResource restoreColor = new ColorUIResource( Color.white );
+
+			FlatTestFrame.updateComponentsRecur( this, (c, type) -> {
+				if( c instanceof JComboBox ) {
+					((JComboBox<?>)c).putClientProperty( FlatClientProperties.STYLE,
+						transparent ? "background: #0000; buttonBackground: #0000; buttonEditableBackground: #0000" : null );
+				} else if( c instanceof JSpinner ) {
+					((JSpinner)c).putClientProperty( FlatClientProperties.STYLE,
+						transparent ? "background: #0000; buttonBackground: #0000" : null );
+				} else if( c instanceof JComponent )
+					c.setBackground( transparent ? transparentColor : restoreColor );
+				else
+					return;
+
+				// if background color is transparent it is also required to make the component non-opaque
+				// DO NOT USE LookAndFeel.installProperty() in real-world applications
+				//            instead use c.setOpaque( false )
+				if( transparent )
+					LookAndFeel.installProperty( (JComponent) c, "opaque", false );
+			} );
+
+			if( !transparent )
+				SwingUtilities.updateComponentTreeUI( this );
+		} );
+	}
+
 	private void roundRectChanged() {
 		Boolean roundRect = roundRectCheckBox.isSelected() ? true : null;
 
@@ -398,6 +429,7 @@ public class FlatComponentsTest
 		magentaCyanOutlineRadioButton = new JRadioButton();
 		focusPaintedCheckBox = new JCheckBox();
 		hideArrowButtonCheckBox = new JCheckBox();
+		transparentBackgroundCheckBox = new JCheckBox();
 		JLabel scrollBarLabel = new JLabel();
 		JScrollBar scrollBar1 = new JScrollBar();
 		JScrollBar scrollBar4 = new JScrollBar();
@@ -1256,6 +1288,7 @@ public class FlatComponentsTest
 				"[]0" +
 				"[]0" +
 				"[]0" +
+				"[]0" +
 				"[]"));
 
 			//---- buttonTypeComboBox ----
@@ -1309,7 +1342,7 @@ public class FlatComponentsTest
 				magentaCyanOutlineRadioButton.addActionListener(e -> outlineChanged());
 				panel4.add(magentaCyanOutlineRadioButton);
 			}
-			panel5.add(panel4, "cell 0 2 1 3");
+			panel5.add(panel4, "cell 0 2 1 4");
 
 			//---- focusPaintedCheckBox ----
 			focusPaintedCheckBox.setText("focusPainted");
@@ -1321,6 +1354,11 @@ public class FlatComponentsTest
 			hideArrowButtonCheckBox.setText("hide arrow button");
 			hideArrowButtonCheckBox.addActionListener(e -> hideArrowButton());
 			panel5.add(hideArrowButtonCheckBox, "cell 1 3");
+
+			//---- transparentBackgroundCheckBox ----
+			transparentBackgroundCheckBox.setText("transparent background");
+			transparentBackgroundCheckBox.addActionListener(e -> transparentBackground());
+			panel5.add(transparentBackgroundCheckBox, "cell 1 4");
 		}
 		add(panel5, "cell 5 13 2 10,grow");
 
@@ -1728,6 +1766,7 @@ public class FlatComponentsTest
 	private JRadioButton magentaCyanOutlineRadioButton;
 	private JCheckBox focusPaintedCheckBox;
 	private JCheckBox hideArrowButtonCheckBox;
+	private JCheckBox transparentBackgroundCheckBox;
 	private JSlider slider1;
 	private JSlider slider6;
 	private JCheckBox sliderPaintTrackCheckBox;

flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatComponentsTest.jfd

@@ -993,7 +993,7 @@ new FormModel {
 			} )
 			add( new FormContainer( "javax.swing.JPanel", new FormLayoutManager( class net.miginfocom.swing.MigLayout ) {
 				"$columnConstraints": "[][]"
-				"$rowConstraints": "[]0[]0[]0[]0[]"
+				"$rowConstraints": "[]0[]0[]0[]0[]0[]"
 				"$layoutConstraints": "ltr,insets dialog,hidemode 3"
 			} ) {
 				name: "panel5"
@@ -1092,7 +1092,7 @@ new FormModel {
 						addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "outlineChanged", false ) )
 					} )
 				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
-					"value": "cell 0 2 1 3"
+					"value": "cell 0 2 1 4"
 				} )
 				add( new FormComponent( "javax.swing.JCheckBox" ) {
 					name: "focusPaintedCheckBox"
@@ -1115,6 +1115,16 @@ new FormModel {
 				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 					"value": "cell 1 3"
 				} )
+				add( new FormComponent( "javax.swing.JCheckBox" ) {
+					name: "transparentBackgroundCheckBox"
+					"text": "transparent background"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+					addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "transparentBackground", false ) )
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 1 4"
+				} )
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 				"value": "cell 5 13 2 10,grow"
 			} )

flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatCustomBordersTest.java

@@ -21,6 +21,7 @@ import javax.swing.*;
 import javax.swing.border.*;
 import javax.swing.plaf.basic.BasicComboBoxEditor;
 import javax.swing.plaf.basic.BasicComboBoxRenderer;
+import com.formdev.flatlaf.FlatClientProperties;
 import com.formdev.flatlaf.icons.FlatFileViewFloppyDriveIcon;
 import com.formdev.flatlaf.util.UIScale;
 import net.miginfocom.swing.*;
@@ -342,22 +343,22 @@ public class FlatCustomBordersTest
 
 		//---- button5 ----
 		button5.setText("text");
-		button5.putClientProperty("JButton.buttonType", "roundRect");
+		button5.putClientProperty(FlatClientProperties.BUTTON_TYPE, FlatClientProperties.BUTTON_TYPE_ROUND_RECT);
 		add(button5, "cell 1 2");
 
 		//---- button6 ----
 		button6.setText("text");
-		button6.putClientProperty("JButton.buttonType", "roundRect");
+		button6.putClientProperty(FlatClientProperties.BUTTON_TYPE, FlatClientProperties.BUTTON_TYPE_ROUND_RECT);
 		add(button6, "cell 2 2");
 
 		//---- button7 ----
 		button7.setText("text");
-		button7.putClientProperty("JButton.buttonType", "roundRect");
+		button7.putClientProperty(FlatClientProperties.BUTTON_TYPE, FlatClientProperties.BUTTON_TYPE_ROUND_RECT);
 		add(button7, "cell 3 2");
 
 		//---- button8 ----
 		button8.setText("text");
-		button8.putClientProperty("JButton.buttonType", "roundRect");
+		button8.putClientProperty(FlatClientProperties.BUTTON_TYPE, FlatClientProperties.BUTTON_TYPE_ROUND_RECT);
 		add(button8, "cell 4 2");
 
 		//---- label5 ----
@@ -372,31 +373,31 @@ public class FlatCustomBordersTest
 		add(comboBox27, "cell 7 3");
 
 		//---- comboBox5 ----
-		comboBox5.putClientProperty("JComponent.roundRect", true);
+		comboBox5.putClientProperty(FlatClientProperties.COMPONENT_ROUND_RECT, true);
 		add(comboBox5, "cell 1 4");
 
 		//---- comboBox6 ----
-		comboBox6.putClientProperty("JComponent.roundRect", true);
+		comboBox6.putClientProperty(FlatClientProperties.COMPONENT_ROUND_RECT, true);
 		add(comboBox6, "cell 2 4");
 
 		//---- comboBox7 ----
-		comboBox7.putClientProperty("JComponent.roundRect", true);
+		comboBox7.putClientProperty(FlatClientProperties.COMPONENT_ROUND_RECT, true);
 		add(comboBox7, "cell 3 4");
 
 		//---- comboBox8 ----
-		comboBox8.putClientProperty("JComponent.roundRect", true);
+		comboBox8.putClientProperty(FlatClientProperties.COMPONENT_ROUND_RECT, true);
 		add(comboBox8, "cell 4 4");
 
 		//---- comboBox24 ----
-		comboBox24.putClientProperty("JComponent.roundRect", true);
+		comboBox24.putClientProperty(FlatClientProperties.COMPONENT_ROUND_RECT, true);
 		add(comboBox24, "cell 5 4");
 
 		//---- comboBox26 ----
-		comboBox26.putClientProperty("JComponent.roundRect", true);
+		comboBox26.putClientProperty(FlatClientProperties.COMPONENT_ROUND_RECT, true);
 		add(comboBox26, "cell 6 4");
 
 		//---- comboBox28 ----
-		comboBox28.putClientProperty("JComponent.roundRect", true);
+		comboBox28.putClientProperty(FlatClientProperties.COMPONENT_ROUND_RECT, true);
 		add(comboBox28, "cell 7 4");
 
 		//---- comboBox9 ----
@@ -428,37 +429,37 @@ public class FlatCustomBordersTest
 		add(comboBox21, "cell 7 5");
 
 		//---- comboBox13 ----
-		comboBox13.putClientProperty("JComponent.roundRect", true);
+		comboBox13.putClientProperty(FlatClientProperties.COMPONENT_ROUND_RECT, true);
 		comboBox13.setEditable(true);
 		add(comboBox13, "cell 1 6");
 
 		//---- comboBox14 ----
-		comboBox14.putClientProperty("JComponent.roundRect", true);
+		comboBox14.putClientProperty(FlatClientProperties.COMPONENT_ROUND_RECT, true);
 		comboBox14.setEditable(true);
 		add(comboBox14, "cell 2 6");
 
 		//---- comboBox15 ----
-		comboBox15.putClientProperty("JComponent.roundRect", true);
+		comboBox15.putClientProperty(FlatClientProperties.COMPONENT_ROUND_RECT, true);
 		comboBox15.setEditable(true);
 		add(comboBox15, "cell 3 6");
 
 		//---- comboBox16 ----
-		comboBox16.putClientProperty("JComponent.roundRect", true);
+		comboBox16.putClientProperty(FlatClientProperties.COMPONENT_ROUND_RECT, true);
 		comboBox16.setEditable(true);
 		add(comboBox16, "cell 4 6");
 
 		//---- comboBox18 ----
-		comboBox18.putClientProperty("JComponent.roundRect", true);
+		comboBox18.putClientProperty(FlatClientProperties.COMPONENT_ROUND_RECT, true);
 		comboBox18.setEditable(true);
 		add(comboBox18, "cell 5 6");
 
 		//---- comboBox20 ----
-		comboBox20.putClientProperty("JComponent.roundRect", true);
+		comboBox20.putClientProperty(FlatClientProperties.COMPONENT_ROUND_RECT, true);
 		comboBox20.setEditable(true);
 		add(comboBox20, "cell 6 6");
 
 		//---- comboBox22 ----
-		comboBox22.putClientProperty("JComponent.roundRect", true);
+		comboBox22.putClientProperty(FlatClientProperties.COMPONENT_ROUND_RECT, true);
 		comboBox22.setEditable(true);
 		add(comboBox22, "cell 7 6");
 
@@ -471,19 +472,19 @@ public class FlatCustomBordersTest
 		add(spinner4, "cell 4 7");
 
 		//---- spinner5 ----
-		spinner5.putClientProperty("JComponent.roundRect", true);
+		spinner5.putClientProperty(FlatClientProperties.COMPONENT_ROUND_RECT, true);
 		add(spinner5, "cell 1 8");
 
 		//---- spinner6 ----
-		spinner6.putClientProperty("JComponent.roundRect", true);
+		spinner6.putClientProperty(FlatClientProperties.COMPONENT_ROUND_RECT, true);
 		add(spinner6, "cell 2 8");
 
 		//---- spinner7 ----
-		spinner7.putClientProperty("JComponent.roundRect", true);
+		spinner7.putClientProperty(FlatClientProperties.COMPONENT_ROUND_RECT, true);
 		add(spinner7, "cell 3 8");
 
 		//---- spinner8 ----
-		spinner8.putClientProperty("JComponent.roundRect", true);
+		spinner8.putClientProperty(FlatClientProperties.COMPONENT_ROUND_RECT, true);
 		add(spinner8, "cell 4 8");
 
 		//---- textFieldLabel ----
@@ -492,11 +493,11 @@ public class FlatCustomBordersTest
 
 		//---- textField1 ----
 		textField1.setText("text");
-		textField1.putClientProperty("JComponent.roundRect", false);
+		textField1.putClientProperty(FlatClientProperties.COMPONENT_ROUND_RECT, false);
 		add(textField1, "cell 1 9,growx");
 
 		//---- textField2 ----
-		textField2.putClientProperty("JComponent.roundRect", false);
+		textField2.putClientProperty(FlatClientProperties.COMPONENT_ROUND_RECT, false);
 		textField2.setText("text");
 		add(textField2, "cell 2 9");
 
@@ -505,27 +506,27 @@ public class FlatCustomBordersTest
 		add(textField3, "cell 3 9");
 
 		//---- textField4 ----
-		textField4.putClientProperty("JComponent.roundRect", false);
+		textField4.putClientProperty(FlatClientProperties.COMPONENT_ROUND_RECT, false);
 		textField4.setText("text");
 		add(textField4, "cell 4 9");
 
 		//---- textField5 ----
 		textField5.setText("text");
-		textField5.putClientProperty("JComponent.roundRect", true);
+		textField5.putClientProperty(FlatClientProperties.COMPONENT_ROUND_RECT, true);
 		add(textField5, "cell 1 10,growx");
 
 		//---- textField6 ----
-		textField6.putClientProperty("JComponent.roundRect", true);
+		textField6.putClientProperty(FlatClientProperties.COMPONENT_ROUND_RECT, true);
 		textField6.setText("text");
 		add(textField6, "cell 2 10");
 
 		//---- textField7 ----
 		textField7.setText("text");
-		textField7.putClientProperty("JComponent.roundRect", true);
+		textField7.putClientProperty(FlatClientProperties.COMPONENT_ROUND_RECT, true);
 		add(textField7, "cell 3 10");
 
 		//---- textField8 ----
-		textField8.putClientProperty("JComponent.roundRect", true);
+		textField8.putClientProperty(FlatClientProperties.COMPONENT_ROUND_RECT, true);
 		textField8.setText("text");
 		add(textField8, "cell 4 10");
 

flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatFontsTest.java

@@ -22,6 +22,7 @@ import java.awt.Font;
 import java.util.Map;
 import java.util.TreeMap;
 import javax.swing.*;
+import com.formdev.flatlaf.FlatClientProperties;
 import com.formdev.flatlaf.fonts.inter.FlatInterFont;
 import com.formdev.flatlaf.fonts.jetbrains_mono.FlatJetBrainsMonoFont;
 import com.formdev.flatlaf.fonts.roboto.FlatRobotoFont;
@@ -132,7 +133,7 @@ public class FlatFontsTest
 
 		//---- previewFamilyNameLabel ----
 		previewFamilyNameLabel.setText("name");
-		previewFamilyNameLabel.putClientProperty("FlatLaf.styleClass", "h1");
+		previewFamilyNameLabel.putClientProperty(FlatClientProperties.STYLE_CLASS, "h1");
 		add(previewFamilyNameLabel, "cell 1 1");
 
 		//======== familiesScrollPane ========

flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatPopupTest.java

@@ -21,6 +21,10 @@ import java.awt.event.MouseEvent;
 import java.util.Random;
 import javax.swing.*;
 import javax.swing.border.*;
+import javax.swing.event.PopupMenuEvent;
+import javax.swing.event.PopupMenuListener;
+import com.formdev.flatlaf.FlatClientProperties;
+import com.formdev.flatlaf.FlatSystemProperties;
 import com.formdev.flatlaf.util.Animator;
 import com.formdev.flatlaf.util.UIScale;
 import net.miginfocom.swing.*;
@@ -43,6 +47,8 @@ public class FlatPopupTest
 
 	FlatPopupTest() {
 		initComponents();
+		addPopupMenuListener( popupMenu1, "popupMenu1" );
+		addPopupMenuListener( popupMenu2, "popupMenu2" );
 	}
 
 	private void showPopupMenu() {
@@ -114,6 +120,46 @@ public class FlatPopupTest
 		}
 	}
 
+	private void showDirectPopup() {
+		DirectPopupContent content = new DirectPopupContent();
+		content.putClientProperty( FlatClientProperties.POPUP_FORCE_HEAVY_WEIGHT, true );
+		Point pt = showDirectPopupButton.getLocationOnScreen();
+
+		System.setProperty( FlatSystemProperties.USE_ROUNDED_POPUP_BORDER, "false" );
+		UIManager.put( "Popup.dropShadowColor", Color.red );
+		UIManager.put( "Popup.dropShadowInsets", new Insets( 5, 5, 5, 5 ) );
+		UIManager.put( "Popup.dropShadowOpacity", 1f );
+
+		Popup popup = PopupFactory.getSharedInstance().getPopup( showDirectPopupButton,
+			content, pt.x, pt.y + showDirectPopupButton.getHeight() + 10 );
+		content.popup = popup;
+		popup.show();
+
+		System.clearProperty( FlatSystemProperties.USE_ROUNDED_POPUP_BORDER );
+		UIManager.put( "Popup.dropShadowColor", null );
+		UIManager.put( "Popup.dropShadowInsets", null );
+		UIManager.put( "Popup.dropShadowOpacity", null );
+	}
+
+	private void addPopupMenuListener( JPopupMenu popupMenu, String name ) {
+		popupMenu.addPopupMenuListener( new PopupMenuListener() {
+			@Override
+			public void popupMenuWillBecomeVisible( PopupMenuEvent e ) {
+				System.out.println( "popupMenuWillBecomeVisible    " + name );
+			}
+
+			@Override
+			public void popupMenuWillBecomeInvisible( PopupMenuEvent e ) {
+				System.out.println( "popupMenuWillBecomeInvisible  " + name );
+			}
+
+			@Override
+			public void popupMenuCanceled( PopupMenuEvent e ) {
+				System.out.println( "popupMenuCanceled             " + name );
+			}
+		} );
+	}
+
 	@Override
 	public void updateUI() {
 		super.updateUI();
@@ -128,15 +174,12 @@ public class FlatPopupTest
 		}
 	}
 
-	private void countChanged() {
-		// TODO add your code here
-	}
-
 	private void initComponents() {
 		// JFormDesigner - Component initialization - DO NOT MODIFY  //GEN-BEGIN:initComponents
 		label1 = new JLabel();
 		label2 = new JLabel();
 		showPopupMenuButton = new JButton();
+		showDirectPopupButton = new JButton();
 		showLargePopupMenuButton = new JButton();
 		showPopupButton = new JButton();
 		hidePopupButton = new JButton();
@@ -209,6 +252,11 @@ public class FlatPopupTest
 		showPopupMenuButton.addActionListener(e -> showPopupMenu());
 		add(showPopupMenuButton, "cell 0 2");
 
+		//---- showDirectPopupButton ----
+		showDirectPopupButton.setText("show direct move/resize popup");
+		showDirectPopupButton.addActionListener(e -> showDirectPopup());
+		add(showDirectPopupButton, "cell 2 2 2 1");
+
 		//---- showLargePopupMenuButton ----
 		showLargePopupMenuButton.setText("show heavy-weight JPopupMenu");
 		showLargePopupMenuButton.addActionListener(e -> showLargePopupMenu());
@@ -240,7 +288,6 @@ public class FlatPopupTest
 
 		//---- countField ----
 		countField.setModel(new SpinnerNumberModel(1, 1, null, 1));
-		countField.addChangeListener(e -> countChanged());
 		add(countField, "cell 5 4");
 
 		//---- label4 ----
@@ -366,6 +413,7 @@ public class FlatPopupTest
 	private JLabel label1;
 	private JLabel label2;
 	private JButton showPopupMenuButton;
+	private JButton showDirectPopupButton;
 	private JButton showLargePopupMenuButton;
 	private JButton showPopupButton;
 	private JButton hidePopupButton;
@@ -444,4 +492,69 @@ public class FlatPopupTest
 		private JLabel label6;
 		// JFormDesigner - End of variables declaration  //GEN-END:variables  @formatter:on
 	}
+
+	//---- class MyPopupContent -----------------------------------------------
+
+	private static class DirectPopupContent
+		extends JPanel
+	{
+		Popup popup;
+
+		DirectPopupContent() {
+			initComponents();
+		}
+
+		private void resizePopup() {
+			Window popupWindow = SwingUtilities.windowForComponent( this );
+			popupWindow.setSize( popupWindow.getWidth() + 20, popupWindow.getHeight() + 50 );
+		}
+
+		private void movePopup() {
+			Window popupWindow = SwingUtilities.windowForComponent( this );
+			popupWindow.setLocation( popupWindow.getX() + 20, popupWindow.getY() + 50 );
+		}
+
+		private void hidePopup() {
+			popup.hide();
+		}
+
+		private void initComponents() {
+			// JFormDesigner - Component initialization - DO NOT MODIFY  //GEN-BEGIN:initComponents  @formatter:off
+			resizeButton = new JButton();
+			moveButton = new JButton();
+			hideButton = new JButton();
+
+			//======== this ========
+			setLayout(new MigLayout(
+				"hidemode 3",
+				// columns
+				"[fill]" +
+				"[fill]" +
+				"[fill]",
+				// rows
+				"[]"));
+
+			//---- resizeButton ----
+			resizeButton.setText("Resize");
+			resizeButton.addActionListener(e -> resizePopup());
+			add(resizeButton, "cell 0 0");
+
+			//---- moveButton ----
+			moveButton.setText("Move");
+			moveButton.addActionListener(e -> movePopup());
+			add(moveButton, "cell 1 0");
+
+			//---- hideButton ----
+			hideButton.setText("Hide");
+			hideButton.addActionListener(e -> hidePopup());
+			add(hideButton, "cell 2 0");
+			// JFormDesigner - End of component initialization  //GEN-END:initComponents  @formatter:on
+		}
+
+		// JFormDesigner - Variables declaration - DO NOT MODIFY  //GEN-BEGIN:variables  @formatter:off
+		private JButton resizeButton;
+		private JButton moveButton;
+		private JButton hideButton;
+		// JFormDesigner - End of variables declaration  //GEN-END:variables  @formatter:on
+	}
 }

flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatPopupTest.jfd

@@ -1,4 +1,4 @@
-JFDML JFormDesigner: "8.2.3.0.386" Java: "21" encoding: "UTF-8"
+JFDML JFormDesigner: "8.3" encoding: "UTF-8"
 
 new FormModel {
 	contentType: "form/swing"
@@ -30,6 +30,13 @@ new FormModel {
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 				"value": "cell 0 2"
 			} )
+			add( new FormComponent( "javax.swing.JButton" ) {
+				name: "showDirectPopupButton"
+				"text": "show direct move/resize popup"
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "showDirectPopup", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 2 2 2 1"
+			} )
 			add( new FormComponent( "javax.swing.JButton" ) {
 				name: "showLargePopupMenuButton"
 				"text": "show heavy-weight JPopupMenu"
@@ -77,7 +84,6 @@ new FormModel {
 					minimum: 1
 					value: 1
 				}
-				addEvent( new FormEvent( "javax.swing.event.ChangeListener", "stateChanged", "countChanged", false ) )
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 				"value": "cell 5 4"
 			} )
@@ -215,5 +221,39 @@ new FormModel {
 		}, new FormLayoutConstraints( null ) {
 			"location": new java.awt.Point( 5, 505 )
 		} )
+		add( new FormContainer( "javax.swing.JPanel", new FormLayoutManager( class net.miginfocom.swing.MigLayout ) {
+			"$layoutConstraints": "hidemode 3"
+			"$columnConstraints": "[fill][fill][fill]"
+			"$rowConstraints": "[]"
+		} ) {
+			name: "panel1"
+			auxiliary() {
+				"JavaCodeGenerator.className": "DirectPopupContent"
+			}
+			add( new FormComponent( "javax.swing.JButton" ) {
+				name: "resizeButton"
+				"text": "Resize"
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "resizePopup", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 0"
+			} )
+			add( new FormComponent( "javax.swing.JButton" ) {
+				name: "moveButton"
+				"text": "Move"
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "movePopup", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 0"
+			} )
+			add( new FormComponent( "javax.swing.JButton" ) {
+				name: "hideButton"
+				"text": "Hide"
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "hidePopup", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 2 0"
+			} )
+		}, new FormLayoutConstraints( null ) {
+			"location": new java.awt.Point( 180, 395 )
+			"size": new java.awt.Dimension( 270, 100 )
+		} )
 	}
 }

flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatTestFrame.java

@@ -37,6 +37,7 @@ import javax.swing.UIManager.LookAndFeelInfo;
 import javax.swing.plaf.ColorUIResource;
 import javax.swing.plaf.metal.MetalLookAndFeel;
 import javax.swing.plaf.nimbus.NimbusLookAndFeel;
+import com.formdev.flatlaf.FlatClientProperties;
 import com.formdev.flatlaf.FlatDarculaLaf;
 import com.formdev.flatlaf.FlatDarkLaf;
 import com.formdev.flatlaf.FlatIntelliJLaf;
@@ -806,7 +807,7 @@ public class FlatTestFrame
 				buttonBar.add(scaleFactorComboBox, "cell 1 0");
 
 				//---- fontSizeSpinner ----
-				fontSizeSpinner.putClientProperty("JComponent.minimumWidth", 50);
+				fontSizeSpinner.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 50);
 				fontSizeSpinner.setModel(new SpinnerNumberModel(0, 0, null, 1));
 				fontSizeSpinner.addChangeListener(e -> fontSizeChanged());
 				buttonBar.add(fontSizeSpinner, "cell 2 0");

flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatTextComponentsTest.java

@@ -316,13 +316,13 @@ public class FlatTextComponentsTest
 		//---- textField1 ----
 		textField1.setText("editable");
 		textField1.setComponentPopupMenu(popupMenu1);
-		textField1.putClientProperty("JTextField.placeholderText", "place");
+		textField1.putClientProperty(FlatClientProperties.PLACEHOLDER_TEXT, "place");
 		add(textField1, "cell 1 0,growx");
 
 		//---- textField3 ----
 		textField3.setText("longer text for testing horizontal scrolling");
 		textField3.setComponentPopupMenu(popupMenu1);
-		textField3.putClientProperty("JTextField.placeholderText", "place");
+		textField3.putClientProperty(FlatClientProperties.PLACEHOLDER_TEXT, "place");
 		add(textField3, "cell 2 0,growx");
 
 		//---- textField2 ----
@@ -330,7 +330,7 @@ public class FlatTextComponentsTest
 		textField2.setSelectionStart(1);
 		textField2.setSelectionEnd(4);
 		textField2.setComponentPopupMenu(popupMenu1);
-		textField2.putClientProperty("JTextField.placeholderText", "place");
+		textField2.putClientProperty(FlatClientProperties.PLACEHOLDER_TEXT, "place");
 		add(textField2, "cell 3 0");
 
 		//---- formattedTextFieldLabel ----
@@ -342,13 +342,13 @@ public class FlatTextComponentsTest
 		//---- formattedTextField1 ----
 		formattedTextField1.setText("editable");
 		formattedTextField1.setComponentPopupMenu(popupMenu1);
-		formattedTextField1.putClientProperty("JTextField.placeholderText", "place");
+		formattedTextField1.putClientProperty(FlatClientProperties.PLACEHOLDER_TEXT, "place");
 		add(formattedTextField1, "cell 1 1,growx");
 
 		//---- formattedTextField3 ----
 		formattedTextField3.setText("longer text for testing horizontal scrolling");
 		formattedTextField3.setComponentPopupMenu(popupMenu1);
-		formattedTextField3.putClientProperty("JTextField.placeholderText", "place");
+		formattedTextField3.putClientProperty(FlatClientProperties.PLACEHOLDER_TEXT, "place");
 		add(formattedTextField3, "cell 2 1,growx");
 
 		//======== panel1 ========
@@ -539,13 +539,13 @@ public class FlatTextComponentsTest
 		//---- passwordField1 ----
 		passwordField1.setText("editable");
 		passwordField1.setComponentPopupMenu(popupMenu1);
-		passwordField1.putClientProperty("JTextField.placeholderText", "place");
+		passwordField1.putClientProperty(FlatClientProperties.PLACEHOLDER_TEXT, "place");
 		add(passwordField1, "cell 1 2,growx");
 
 		//---- passwordField3 ----
 		passwordField3.setText("longer text for testing horizontal scrolling");
 		passwordField3.setComponentPopupMenu(popupMenu1);
-		passwordField3.putClientProperty("JTextField.placeholderText", "place");
+		passwordField3.putClientProperty(FlatClientProperties.PLACEHOLDER_TEXT, "place");
 		add(passwordField3, "cell 2 2,growx");
 
 		//---- textAreaLabel ----

flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatTypographyTest.java

@@ -24,6 +24,7 @@ import java.io.IOException;
 import java.net.URI;
 import java.net.URISyntaxException;
 import javax.swing.*;
+import com.formdev.flatlaf.FlatClientProperties;
 import net.miginfocom.swing.*;
 
 /**
@@ -205,57 +206,57 @@ public class FlatTypographyTest
 
 		//---- label54 ----
 		label54.setText("<html>FlatLaf<br><small>Windows</small></html>");
-		label54.putClientProperty("FlatLaf.styleClass", "h1");
+		label54.putClientProperty(FlatClientProperties.STYLE_CLASS, "h1");
 		add(label54, "cell 0 0");
 
 		//---- label68 ----
 		label68.setText("<html>JetBrains<br><small>Windows</small></html>");
-		label68.putClientProperty("FlatLaf.styleClass", "h1");
+		label68.putClientProperty(FlatClientProperties.STYLE_CLASS, "h1");
 		add(label68, "cell 1 0");
 
 		//---- label69 ----
 		label69.setText("<html>JetBrains<br><small>macOS</small></html>");
-		label69.putClientProperty("FlatLaf.styleClass", "h1");
+		label69.putClientProperty(FlatClientProperties.STYLE_CLASS, "h1");
 		add(label69, "cell 2 0");
 
 		//---- label10 ----
 		label10.setText("macOS");
-		label10.putClientProperty("FlatLaf.styleClass", "h1");
+		label10.putClientProperty(FlatClientProperties.STYLE_CLASS, "h1");
 		add(label10, "cell 3 0");
 
 		//---- label11 ----
 		label11.setText("Windows 10/11");
-		label11.putClientProperty("FlatLaf.styleClass", "h1");
+		label11.putClientProperty(FlatClientProperties.STYLE_CLASS, "h1");
 		add(label11, "cell 4 0");
 
 		//---- label72 ----
 		label72.setText("<html>GitHub<br>Primer</html>");
-		label72.putClientProperty("FlatLaf.styleClass", "h1");
+		label72.putClientProperty(FlatClientProperties.STYLE_CLASS, "h1");
 		add(label72, "cell 5 0");
 
 		//---- label28 ----
 		label28.setText("Material");
-		label28.putClientProperty("FlatLaf.styleClass", "h1");
+		label28.putClientProperty(FlatClientProperties.STYLE_CLASS, "h1");
 		add(label28, "cell 6 0");
 
 		//---- label29 ----
 		label29.setText("Material 3");
-		label29.putClientProperty("FlatLaf.styleClass", "h1");
+		label29.putClientProperty(FlatClientProperties.STYLE_CLASS, "h1");
 		add(label29, "cell 7 0");
 
 		//---- label1 ----
 		label1.setText("SAP Fiori");
-		label1.putClientProperty("FlatLaf.styleClass", "h1");
+		label1.putClientProperty(FlatClientProperties.STYLE_CLASS, "h1");
 		add(label1, "cell 8 0");
 
 		//---- label37 ----
 		label37.setText("Atlassian");
-		label37.putClientProperty("FlatLaf.styleClass", "h1");
+		label37.putClientProperty(FlatClientProperties.STYLE_CLASS, "h1");
 		add(label37, "cell 9 0");
 
 		//---- label46 ----
 		label46.setText("Iris");
-		label46.putClientProperty("FlatLaf.styleClass", "h1");
+		label46.putClientProperty(FlatClientProperties.STYLE_CLASS, "h1");
 		add(label46, "cell 10 0");
 
 		//---- linkLabel9 ----
@@ -1147,7 +1148,7 @@ public class FlatTypographyTest
 
 			//---- descLabel ----
 			descLabel.setText("description");
-			descLabel.putClientProperty("FlatLaf.styleClass", "small");
+			descLabel.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 			descLabel.setEnabled(false);
 			add(descLabel, "cell 0 1");
 			// JFormDesigner - End of component initialization  //GEN-END:initComponents

flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatWindowDecorationsTest.java

@@ -241,7 +241,7 @@ public class FlatWindowDecorationsTest
 			tallCompCheckBox.setSelected( false );
 
 			JButton myButton = new JButton( "?" );
-			myButton.putClientProperty( "JButton.buttonType", "toolBarButton" );
+			myButton.putClientProperty( FlatClientProperties.BUTTON_TYPE, FlatClientProperties.BUTTON_TYPE_TOOLBAR_BUTTON );
 			myButton.setFocusable( false );
 
 			menuBar.add( Box.createGlue() );
@@ -499,7 +499,7 @@ debug*/
 		if( typeUtilityRadioButton.isSelected() )
 			window.setType( Window.Type.UTILITY );
 		else if( typeSmallRadioButton.isSelected() )
-			((RootPaneContainer)window).getRootPane().putClientProperty( "Window.style", "small" );
+			((RootPaneContainer)window).getRootPane().putClientProperty( FlatClientProperties.WINDOW_STYLE, FlatClientProperties.WINDOW_STYLE_SMALL );
 	}
 
 	private void decorationStyleChanged() {

flatlaf-theme-editor/src/main/java/com/formdev/flatlaf/themeeditor/FlatThemePreview.java

@@ -28,6 +28,7 @@ import javax.swing.UIDefaults.ActiveValue;
 import javax.swing.UIDefaults.LazyValue;
 import javax.swing.event.DocumentEvent;
 import javax.swing.event.DocumentListener;
+import com.formdev.flatlaf.FlatClientProperties;
 import com.formdev.flatlaf.FlatLaf;
 import com.formdev.flatlaf.UIDefaultsLoaderAccessor;
 import com.formdev.flatlaf.extras.components.*;
@@ -252,7 +253,7 @@ class FlatThemePreview
 
 		//---- previewLabel ----
 		previewLabel.setText(" Preview ");
-		previewLabel.putClientProperty("FlatLaf.styleClass", "h2");
+		previewLabel.putClientProperty(FlatClientProperties.STYLE_CLASS, "h2");
 		// JFormDesigner - End of component initialization  //GEN-END:initComponents
 	}
 

flatlaf-theme-editor/src/main/java/com/formdev/flatlaf/themeeditor/FlatThemePreviewAll.java

@@ -423,7 +423,7 @@ class FlatThemePreviewAll
 
 		//---- label1 ----
 		label1.setText("Some Text");
-		label1.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-label");
+		label1.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-label");
 		add(label1, "cell 1 1 2 1");
 
 		//---- flatButton1 ----
@@ -438,12 +438,12 @@ class FlatThemePreviewAll
 
 		//---- button1 ----
 		button1.setText("OK");
-		button1.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-button");
+		button1.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-button");
 		add(button1, "cell 1 2");
 
 		//---- testDefaultButton1 ----
 		testDefaultButton1.setText("Default");
-		testDefaultButton1.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-button");
+		testDefaultButton1.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-button");
 		add(testDefaultButton1, "cell 2 2");
 
 		//---- toggleButtonLabel ----
@@ -452,13 +452,13 @@ class FlatThemePreviewAll
 
 		//---- toggleButton1 ----
 		toggleButton1.setText("Unselected");
-		toggleButton1.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-togglebutton");
+		toggleButton1.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-togglebutton");
 		add(toggleButton1, "cell 1 3");
 
 		//---- toggleButton3 ----
 		toggleButton3.setText("Selected");
 		toggleButton3.setSelected(true);
-		toggleButton3.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-togglebutton");
+		toggleButton3.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-togglebutton");
 		add(toggleButton3, "cell 2 3");
 
 		//---- checkBoxLabel ----
@@ -467,13 +467,13 @@ class FlatThemePreviewAll
 
 		//---- checkBox1 ----
 		checkBox1.setText("Unselected");
-		checkBox1.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-checkbox");
+		checkBox1.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-checkbox");
 		add(checkBox1, "cell 1 4,alignx left,growx 0");
 
 		//---- checkBox3 ----
 		checkBox3.setText("Selected");
 		checkBox3.setSelected(true);
-		checkBox3.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-checkbox");
+		checkBox3.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-checkbox");
 		add(checkBox3, "cell 2 4,alignx left,growx 0");
 
 		//---- radioButtonLabel ----
@@ -482,13 +482,13 @@ class FlatThemePreviewAll
 
 		//---- radioButton1 ----
 		radioButton1.setText("Unselected");
-		radioButton1.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-radiobutton");
+		radioButton1.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-radiobutton");
 		add(radioButton1, "cell 1 5,alignx left,growx 0");
 
 		//---- radioButton3 ----
 		radioButton3.setText("Selected");
 		radioButton3.setSelected(true);
-		radioButton3.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-radiobutton");
+		radioButton3.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-radiobutton");
 		add(radioButton3, "cell 2 5,alignx left,growx 0");
 
 		//---- comboBoxLabel ----
@@ -513,7 +513,7 @@ class FlatThemePreviewAll
 		}));
 		comboBox1.setMaximumRowCount(6);
 		comboBox1.setPlaceholderText("placeholder text");
-		comboBox1.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-combobox");
+		comboBox1.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-combobox");
 		add(comboBox1, "cell 1 6");
 
 		//---- comboBox3 ----
@@ -526,7 +526,7 @@ class FlatThemePreviewAll
 			"e"
 		}));
 		comboBox3.setMaximumRowCount(6);
-		comboBox3.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-combobox");
+		comboBox3.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-combobox");
 		add(comboBox3, "cell 2 6");
 
 		//---- spinnerLabel ----
@@ -534,7 +534,7 @@ class FlatThemePreviewAll
 		add(spinnerLabel, "cell 0 7");
 
 		//---- spinner1 ----
-		spinner1.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-spinner");
+		spinner1.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-spinner");
 		add(spinner1, "cell 1 7 2 1");
 
 		//---- textFieldLabel ----
@@ -544,24 +544,24 @@ class FlatThemePreviewAll
 		//---- textField1 ----
 		textField1.setText("Some Text");
 		textField1.setPlaceholderText("placeholder text");
-		textField1.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-textfield");
+		textField1.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-textfield");
 		add(textField1, "cell 1 8");
 
 		//---- textField2 ----
 		textField2.setText("Txt");
-		textField2.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-textfield");
+		textField2.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-textfield");
 		add(textField2, "cell 2 8");
 
 		//---- formattedTextField1 ----
 		formattedTextField1.setText("Some Text");
 		formattedTextField1.setPlaceholderText("placeholder text");
-		formattedTextField1.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-formattedtextfield");
+		formattedTextField1.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-formattedtextfield");
 		add(formattedTextField1, "cell 1 9");
 
 		//---- passwordField1 ----
 		passwordField1.setText("Some Text");
 		passwordField1.setPlaceholderText("placeholder text");
-		passwordField1.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-passwordfield");
+		passwordField1.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-passwordfield");
 		passwordField1.setShowClearButton(true);
 		add(passwordField1, "cell 2 9");
 
@@ -577,7 +577,7 @@ class FlatThemePreviewAll
 			//---- textArea1 ----
 			textArea1.setText("Text");
 			textArea1.setRows(2);
-			textArea1.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-textarea");
+			textArea1.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-textarea");
 			scrollPane1.setViewportView(textArea1);
 		}
 		add(scrollPane1, "cell 1 10 2 1,width 40");
@@ -589,7 +589,7 @@ class FlatThemePreviewAll
 
 			//---- editorPane1 ----
 			editorPane1.setText("Text");
-			editorPane1.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-editorpane");
+			editorPane1.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-editorpane");
 			scrollPane5.setViewportView(editorPane1);
 		}
 		add(scrollPane5, "cell 1 10 2 1,width 40");
@@ -601,7 +601,7 @@ class FlatThemePreviewAll
 
 			//---- textPane1 ----
 			textPane1.setText("Text");
-			textPane1.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-textpane");
+			textPane1.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-textpane");
 			scrollPane9.setViewportView(textPane1);
 		}
 		add(scrollPane9, "cell 1 10 2 1,width 40");
@@ -615,62 +615,62 @@ class FlatThemePreviewAll
 		menuUnderlineSelectionButton.setButtonType(FlatButton.ButtonType.toolBarButton);
 		menuUnderlineSelectionButton.setToolTipText("menu underline selection");
 		menuUnderlineSelectionButton.setFocusable(false);
-		menuUnderlineSelectionButton.putClientProperty("FlatLaf.styleClass", "small");
+		menuUnderlineSelectionButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 		menuUnderlineSelectionButton.addActionListener(e -> menuUnderlineSelectionChanged());
 		add(menuUnderlineSelectionButton, "cell 0 11");
 
 		//======== menuBar1 ========
 		{
-			menuBar1.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-menubar");
+			menuBar1.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-menubar");
 
 			//======== menu2 ========
 			{
 				menu2.setText("JMenu");
-				menu2.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-menu");
+				menu2.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-menu");
 
 				//---- menuItem3 ----
 				menuItem3.setText("JMenuItem");
-				menuItem3.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-menuitem");
+				menuItem3.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-menuitem");
 				menu2.add(menuItem3);
 
 				//---- menuItem4 ----
 				menuItem4.setText("JMenuItem");
-				menuItem4.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-menuitem");
+				menuItem4.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-menuitem");
 				menu2.add(menuItem4);
 				menu2.addSeparator();
 
 				//---- checkBoxMenuItem2 ----
 				checkBoxMenuItem2.setText("JCheckBoxMenuItem");
 				checkBoxMenuItem2.setSelected(true);
-				checkBoxMenuItem2.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-checkboxmenuitem");
+				checkBoxMenuItem2.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-checkboxmenuitem");
 				menu2.add(checkBoxMenuItem2);
 
 				//---- checkBoxMenuItem3 ----
 				checkBoxMenuItem3.setText("JCheckBoxMenuItem");
-				checkBoxMenuItem3.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-checkboxmenuitem");
+				checkBoxMenuItem3.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-checkboxmenuitem");
 				menu2.add(checkBoxMenuItem3);
 				menu2.addSeparator();
 
 				//---- radioButtonMenuItem4 ----
 				radioButtonMenuItem4.setText("JRadioButtonMenuItem");
 				radioButtonMenuItem4.setSelected(true);
-				radioButtonMenuItem4.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-radiobuttonmenuitem");
+				radioButtonMenuItem4.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-radiobuttonmenuitem");
 				menu2.add(radioButtonMenuItem4);
 
 				//---- radioButtonMenuItem5 ----
 				radioButtonMenuItem5.setText("JRadioButtonMenuItem");
-				radioButtonMenuItem5.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-radiobuttonmenuitem");
+				radioButtonMenuItem5.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-radiobuttonmenuitem");
 				menu2.add(radioButtonMenuItem5);
 				menu2.addSeparator();
 
 				//======== menu4 ========
 				{
 					menu4.setText("JMenu");
-					menu4.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-menu");
+					menu4.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-menu");
 
 					//---- menuItem6 ----
 					menuItem6.setText("JMenuItem");
-					menuItem6.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-menuitem");
+					menuItem6.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-menuitem");
 					menu4.add(menuItem6);
 				}
 				menu2.add(menu4);
@@ -678,11 +678,11 @@ class FlatThemePreviewAll
 				//======== menu5 ========
 				{
 					menu5.setText("JMenu");
-					menu5.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-menu");
+					menu5.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-menu");
 
 					//---- menuItem7 ----
 					menuItem7.setText("JMenuItem");
-					menuItem7.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-menuitem");
+					menuItem7.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-menuitem");
 					menu5.add(menuItem7);
 				}
 				menu2.add(menu5);
@@ -692,22 +692,22 @@ class FlatThemePreviewAll
 			//======== menu3 ========
 			{
 				menu3.setText("JMenu");
-				menu3.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-menu");
+				menu3.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-menu");
 
 				//---- menuItem5 ----
 				menuItem5.setText("JMenuItem");
 				menuItem5.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_P, KeyEvent.CTRL_DOWN_MASK|KeyEvent.ALT_DOWN_MASK|KeyEvent.SHIFT_DOWN_MASK));
-				menuItem5.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-menuitem");
+				menuItem5.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-menuitem");
 				menu3.add(menuItem5);
 
 				//---- menuItem8 ----
 				menuItem8.setText("JMenuItem");
-				menuItem8.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-menuitem");
+				menuItem8.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-menuitem");
 				menu3.add(menuItem8);
 
 				//---- menuItem9 ----
 				menuItem9.setText("JMenuItem");
-				menuItem9.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-menuitem");
+				menuItem9.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-menuitem");
 				menu3.add(menuItem9);
 			}
 			menuBar1.add(menu3);
@@ -720,14 +720,14 @@ class FlatThemePreviewAll
 
 		//---- scrollBar1 ----
 		scrollBar1.setOrientation(Adjustable.HORIZONTAL);
-		scrollBar1.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-scrollbar");
+		scrollBar1.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-scrollbar");
 		scrollBar1.setVisibleAmount(50);
 		add(scrollBar1, "cell 1 12 2 1");
 
 		//---- scrollBar5 ----
 		scrollBar5.setOrientation(Adjustable.HORIZONTAL);
 		scrollBar5.setShowButtons(true);
-		scrollBar5.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-scrollbar");
+		scrollBar5.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-scrollbar");
 		scrollBar5.setVisibleAmount(50);
 		add(scrollBar5, "cell 1 13 2 1");
 
@@ -736,7 +736,7 @@ class FlatThemePreviewAll
 		add(separatorLabel, "cell 0 14");
 
 		//---- separator1 ----
-		separator1.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-separator");
+		separator1.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-separator");
 		add(separator1, "cell 1 14 2 1");
 
 		//---- sliderLabel ----
@@ -744,7 +744,7 @@ class FlatThemePreviewAll
 		add(sliderLabel, "cell 0 15");
 
 		//---- slider1 ----
-		slider1.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-slider");
+		slider1.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-slider");
 		add(slider1, "cell 1 15 2 1,width 100");
 
 		//---- slider3 ----
@@ -752,7 +752,7 @@ class FlatThemePreviewAll
 		slider3.setPaintTicks(true);
 		slider3.setMajorTickSpacing(50);
 		slider3.setPaintLabels(true);
-		slider3.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-slider");
+		slider3.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-slider");
 		slider3.addChangeListener(e -> changeProgress());
 		add(slider3, "cell 1 16 2 1,width 100");
 
@@ -762,13 +762,13 @@ class FlatThemePreviewAll
 
 		//---- progressBar1 ----
 		progressBar1.setValue(50);
-		progressBar1.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-progressbar");
+		progressBar1.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-progressbar");
 		add(progressBar1, "cell 1 17 2 1");
 
 		//---- progressBar2 ----
 		progressBar2.setValue(50);
 		progressBar2.setStringPainted(true);
-		progressBar2.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-progressbar");
+		progressBar2.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-progressbar");
 		add(progressBar2, "cell 1 18 2 1");
 
 		//---- toolTipLabel ----
@@ -777,7 +777,7 @@ class FlatThemePreviewAll
 
 		//---- toolTip1 ----
 		toolTip1.setTipText("Some text in tool tip.");
-		toolTip1.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-tooltip");
+		toolTip1.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-tooltip");
 		add(toolTip1, "cell 1 19 2 1,alignx left,growx 0");
 
 		//---- toolBarLabel ----
@@ -786,39 +786,39 @@ class FlatThemePreviewAll
 
 		//======== toolBar1 ========
 		{
-			toolBar1.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-toolbar");
+			toolBar1.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-toolbar");
 
 			//---- button4 ----
 			button4.setIcon(UIManager.getIcon("Tree.closedIcon"));
-			button4.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-toolbar-button");
+			button4.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-toolbar-button");
 			toolBar1.add(button4);
 
 			//---- button6 ----
 			button6.setIcon(UIManager.getIcon("Tree.openIcon"));
-			button6.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-toolbar-button");
+			button6.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-toolbar-button");
 			toolBar1.add(button6);
 			toolBar1.addSeparator();
 
 			//---- button7 ----
 			button7.setIcon(UIManager.getIcon("Tree.leafIcon"));
-			button7.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-toolbar-togglebutton");
+			button7.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-toolbar-togglebutton");
 			toolBar1.add(button7);
 
 			//---- button8 ----
 			button8.setIcon(UIManager.getIcon("Tree.leafIcon"));
-			button8.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-toolbar-togglebutton");
+			button8.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-toolbar-togglebutton");
 			toolBar1.add(button8);
 
 			//---- button9 ----
 			button9.setIcon(UIManager.getIcon("Tree.leafIcon"));
 			button9.setSelected(true);
-			button9.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-toolbar-togglebutton");
+			button9.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-toolbar-togglebutton");
 			toolBar1.add(button9);
 
 			//---- button10 ----
 			button10.setIcon(UIManager.getIcon("Tree.leafIcon"));
 			button10.setSelected(true);
-			button10.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-toolbar-togglebutton");
+			button10.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-toolbar-togglebutton");
 			toolBar1.add(button10);
 		}
 		add(toolBar1, "cell 1 20 2 1");
@@ -829,7 +829,7 @@ class FlatThemePreviewAll
 
 		//======== tabbedPane1 ========
 		{
-			tabbedPane1.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-tabbedpane");
+			tabbedPane1.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-tabbedpane");
 		}
 		add(tabbedPane1, "cell 1 21 2 1");
 
@@ -840,7 +840,7 @@ class FlatThemePreviewAll
 		//======== splitPane1 ========
 		{
 			splitPane1.setResizeWeight(0.5);
-			splitPane1.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-splitpane");
+			splitPane1.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-splitpane");
 
 			//======== scrollPane2 ========
 			{
@@ -858,7 +858,7 @@ class FlatThemePreviewAll
 					@Override
 					public String getElementAt(int i) { return values[i]; }
 				});
-				list1.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-list");
+				list1.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-list");
 				scrollPane2.setViewportView(list1);
 			}
 			splitPane1.setLeftComponent(scrollPane2);
@@ -879,7 +879,7 @@ class FlatThemePreviewAll
 							add(node1);
 						}
 					}));
-				tree1.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-tree");
+				tree1.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-tree");
 				scrollPane3.setViewportView(tree1);
 			}
 			splitPane1.setRightComponent(scrollPane3);
@@ -903,7 +903,7 @@ class FlatThemePreviewAll
 					"Column 1", "Column 2"
 				}
 			));
-			table1.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-table");
+			table1.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-table");
 			scrollPane4.setViewportView(table1);
 		}
 		add(scrollPane4, "cell 1 23 2 1,width 100,height 70");
@@ -914,7 +914,7 @@ class FlatThemePreviewAll
 
 		//======== desktopPane1 ========
 		{
-			desktopPane1.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-desktoppane");
+			desktopPane1.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-desktoppane");
 
 			//======== internalFrame1 ========
 			{
@@ -924,7 +924,7 @@ class FlatThemePreviewAll
 				internalFrame1.setMaximizable(true);
 				internalFrame1.setIconifiable(true);
 				internalFrame1.setResizable(true);
-				internalFrame1.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-internalframe");
+				internalFrame1.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-internalframe");
 				Container internalFrame1ContentPane = internalFrame1.getContentPane();
 				internalFrame1ContentPane.setLayout(new BorderLayout());
 			}
@@ -939,7 +939,7 @@ class FlatThemePreviewAll
 				internalFrame2.setMaximizable(true);
 				internalFrame2.setResizable(true);
 				internalFrame2.setTitle("Inactive");
-				internalFrame2.putClientProperty("FlatLaf.styleClass", "flatlaf-preview-internalframe");
+				internalFrame2.putClientProperty(FlatClientProperties.STYLE_CLASS, "flatlaf-preview-internalframe");
 				Container internalFrame2ContentPane = internalFrame2.getContentPane();
 				internalFrame2ContentPane.setLayout(new BorderLayout());
 			}

flatlaf-theme-editor/src/main/java/com/formdev/flatlaf/themeeditor/FlatThemePreviewButtons.java

@@ -21,6 +21,7 @@ import java.awt.Component;
 import java.util.Objects;
 import java.util.function.Predicate;
 import javax.swing.*;
+import com.formdev.flatlaf.FlatClientProperties;
 import net.miginfocom.swing.*;
 
 /**
@@ -232,25 +233,25 @@ class FlatThemePreviewButtons
 				//---- noneButton ----
 				noneButton.setText("none");
 				noneButton.setSelected(true);
-				noneButton.putClientProperty("FlatLaf.styleClass", "small");
+				noneButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 				noneButton.addActionListener(e -> buttonTypeChanged());
 				buttonTypeToolBar1.add(noneButton);
 
 				//---- squareButton ----
 				squareButton.setText("square");
-				squareButton.putClientProperty("FlatLaf.styleClass", "small");
+				squareButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 				squareButton.addActionListener(e -> buttonTypeChanged());
 				buttonTypeToolBar1.add(squareButton);
 
 				//---- roundRectButton ----
 				roundRectButton.setText("roundRect");
-				roundRectButton.putClientProperty("FlatLaf.styleClass", "small");
+				roundRectButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 				roundRectButton.addActionListener(e -> buttonTypeChanged());
 				buttonTypeToolBar1.add(roundRectButton);
 
 				//---- tabButton ----
 				tabButton.setText("tab");
-				tabButton.putClientProperty("FlatLaf.styleClass", "small");
+				tabButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 				tabButton.addActionListener(e -> buttonTypeChanged());
 				buttonTypeToolBar1.add(tabButton);
 			}
@@ -263,13 +264,13 @@ class FlatThemePreviewButtons
 
 				//---- toolBarButtonButton ----
 				toolBarButtonButton.setText("toolBarButton");
-				toolBarButtonButton.putClientProperty("FlatLaf.styleClass", "small");
+				toolBarButtonButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 				toolBarButtonButton.addActionListener(e -> buttonTypeChanged());
 				buttonTypeToolBar2.add(toolBarButtonButton);
 
 				//---- borderlessButton ----
 				borderlessButton.setText("borderless");
-				borderlessButton.putClientProperty("FlatLaf.styleClass", "small");
+				borderlessButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 				borderlessButton.addActionListener(e -> buttonTypeChanged());
 				buttonTypeToolBar2.add(borderlessButton);
 			}
@@ -279,7 +280,7 @@ class FlatThemePreviewButtons
 
 		//---- label11 ----
 		label11.setText("JButton");
-		label11.putClientProperty("FlatLaf.styleClass", "h3");
+		label11.putClientProperty(FlatClientProperties.STYLE_CLASS, "h3");
 		add(label11, "cell 0 1 3 1");
 
 		//---- label27 ----
@@ -292,22 +293,22 @@ class FlatThemePreviewButtons
 
 		//---- label5 ----
 		label5.setText("regular");
-		label5.putClientProperty("FlatLaf.styleClass", "small");
+		label5.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 		add(label5, "cell 1 3,alignx center,growx 0");
 
 		//---- label7 ----
 		label7.setText("default");
-		label7.putClientProperty("FlatLaf.styleClass", "small");
+		label7.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 		add(label7, "cell 2 3,alignx center,growx 0");
 
 		//---- label6 ----
 		label6.setText("regular");
-		label6.putClientProperty("FlatLaf.styleClass", "small");
+		label6.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 		add(label6, "cell 3 3,alignx center,growx 0");
 
 		//---- label8 ----
 		label8.setText("default");
-		label8.putClientProperty("FlatLaf.styleClass", "small");
+		label8.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 		add(label8, "cell 4 3,alignx center,growx 0");
 
 		//---- label1 ----
@@ -316,26 +317,26 @@ class FlatThemePreviewButtons
 
 		//---- testStateButton1 ----
 		testStateButton1.setText("OK");
-		testStateButton1.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton1.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
 		add(testStateButton1, "cell 1 4");
 
 		//---- testStateButton7 ----
 		testStateButton7.setText("OK");
 		testStateButton7.setStateDefault(true);
-		testStateButton7.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton7.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
 		add(testStateButton7, "cell 2 4");
 
 		//---- testStateButton4 ----
 		testStateButton4.setText("OK");
 		testStateButton4.setStateFocused(true);
-		testStateButton4.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton4.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
 		add(testStateButton4, "cell 3 4");
 
 		//---- testStateButton10 ----
 		testStateButton10.setText("OK");
 		testStateButton10.setStateFocused(true);
 		testStateButton10.setStateDefault(true);
-		testStateButton10.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton10.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
 		add(testStateButton10, "cell 4 4");
 
 		//---- label2 ----
@@ -345,21 +346,21 @@ class FlatThemePreviewButtons
 		//---- testStateButton2 ----
 		testStateButton2.setText("OK");
 		testStateButton2.setStateHover(true);
-		testStateButton2.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton2.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
 		add(testStateButton2, "cell 1 5");
 
 		//---- testStateButton8 ----
 		testStateButton8.setText("OK");
 		testStateButton8.setStateHover(true);
 		testStateButton8.setStateDefault(true);
-		testStateButton8.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton8.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
 		add(testStateButton8, "cell 2 5");
 
 		//---- testStateButton5 ----
 		testStateButton5.setText("OK");
 		testStateButton5.setStateHover(true);
 		testStateButton5.setStateFocused(true);
-		testStateButton5.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton5.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
 		add(testStateButton5, "cell 3 5");
 
 		//---- testStateButton11 ----
@@ -367,7 +368,7 @@ class FlatThemePreviewButtons
 		testStateButton11.setStateHover(true);
 		testStateButton11.setStateFocused(true);
 		testStateButton11.setStateDefault(true);
-		testStateButton11.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton11.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
 		add(testStateButton11, "cell 4 5");
 
 		//---- label3 ----
@@ -377,21 +378,21 @@ class FlatThemePreviewButtons
 		//---- testStateButton3 ----
 		testStateButton3.setText("OK");
 		testStateButton3.setStatePressed(true);
-		testStateButton3.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton3.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
 		add(testStateButton3, "cell 1 6");
 
 		//---- testStateButton9 ----
 		testStateButton9.setText("OK");
 		testStateButton9.setStatePressed(true);
 		testStateButton9.setStateDefault(true);
-		testStateButton9.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton9.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
 		add(testStateButton9, "cell 2 6");
 
 		//---- testStateButton6 ----
 		testStateButton6.setText("OK");
 		testStateButton6.setStatePressed(true);
 		testStateButton6.setStateFocused(true);
-		testStateButton6.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton6.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
 		add(testStateButton6, "cell 3 6");
 
 		//---- testStateButton12 ----
@@ -399,7 +400,7 @@ class FlatThemePreviewButtons
 		testStateButton12.setStatePressed(true);
 		testStateButton12.setStateFocused(true);
 		testStateButton12.setStateDefault(true);
-		testStateButton12.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton12.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
 		add(testStateButton12, "cell 4 6");
 
 		//---- label4 ----
@@ -409,14 +410,14 @@ class FlatThemePreviewButtons
 		//---- testStateButton13 ----
 		testStateButton13.setText("OK");
 		testStateButton13.setEnabled(false);
-		testStateButton13.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton13.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
 		add(testStateButton13, "cell 1 7");
 
 		//---- testStateButton14 ----
 		testStateButton14.setText("OK");
 		testStateButton14.setEnabled(false);
 		testStateButton14.setStateDefault(true);
-		testStateButton14.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton14.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
 		add(testStateButton14, "cell 2 7");
 
 		//---- label10 ----
@@ -425,17 +426,17 @@ class FlatThemePreviewButtons
 
 		//---- button1 ----
 		button1.setText("OK");
-		button1.putClientProperty("JComponent.minimumWidth", 0);
+		button1.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
 		add(button1, "cell 1 8");
 
 		//---- testDefaultButton1 ----
 		testDefaultButton1.setText("OK");
-		testDefaultButton1.putClientProperty("JComponent.minimumWidth", 0);
+		testDefaultButton1.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
 		add(testDefaultButton1, "cell 2 8");
 
 		//---- label12 ----
 		label12.setText("JToggleButton");
-		label12.putClientProperty("FlatLaf.styleClass", "h3");
+		label12.putClientProperty(FlatClientProperties.STYLE_CLASS, "h3");
 		add(label12, "cell 0 9 3 1");
 
 		//---- label29 ----
@@ -448,22 +449,22 @@ class FlatThemePreviewButtons
 
 		//---- label13 ----
 		label13.setText("unsel.");
-		label13.putClientProperty("FlatLaf.styleClass", "small");
+		label13.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 		add(label13, "cell 1 11,alignx center,growx 0");
 
 		//---- label14 ----
 		label14.setText("selected");
-		label14.putClientProperty("FlatLaf.styleClass", "small");
+		label14.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 		add(label14, "cell 2 11,alignx center,growx 0");
 
 		//---- label15 ----
 		label15.setText("unsel.");
-		label15.putClientProperty("FlatLaf.styleClass", "small");
+		label15.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 		add(label15, "cell 3 11,alignx center,growx 0");
 
 		//---- label16 ----
 		label16.setText("selected");
-		label16.putClientProperty("FlatLaf.styleClass", "small");
+		label16.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 		add(label16, "cell 4 11,alignx center,growx 0");
 
 		//---- label17 ----
@@ -576,7 +577,7 @@ class FlatThemePreviewButtons
 
 		//---- label32 ----
 		label32.setText("Help Button");
-		label32.putClientProperty("FlatLaf.styleClass", "h3");
+		label32.putClientProperty(FlatClientProperties.STYLE_CLASS, "h3");
 		add(label32, "cell 0 17 2 1");
 
 		//---- label9 ----
@@ -592,14 +593,14 @@ class FlatThemePreviewButtons
 		add(label22, "cell 0 19");
 
 		//---- testStateButton15 ----
-		testStateButton15.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton15.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
-		testStateButton15.putClientProperty("JButton.buttonType", "help");
+		testStateButton15.putClientProperty(FlatClientProperties.BUTTON_TYPE, FlatClientProperties.BUTTON_TYPE_HELP);
 		add(testStateButton15, "cell 1 19 2 1,alignx center,growx 0");
 
 		//---- testStateButton19 ----
 		testStateButton19.setStateFocused(true);
-		testStateButton19.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton19.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
-		testStateButton19.putClientProperty("JButton.buttonType", "help");
+		testStateButton19.putClientProperty(FlatClientProperties.BUTTON_TYPE, FlatClientProperties.BUTTON_TYPE_HELP);
 		add(testStateButton19, "cell 3 19 2 1,alignx center,growx 0");
 
 		//---- label23 ----
@@ -608,15 +609,15 @@ class FlatThemePreviewButtons
 
 		//---- testStateButton16 ----
 		testStateButton16.setStateHover(true);
-		testStateButton16.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton16.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
-		testStateButton16.putClientProperty("JButton.buttonType", "help");
+		testStateButton16.putClientProperty(FlatClientProperties.BUTTON_TYPE, FlatClientProperties.BUTTON_TYPE_HELP);
 		add(testStateButton16, "cell 1 20 2 1,alignx center,growx 0");
 
 		//---- testStateButton20 ----
 		testStateButton20.setStateHover(true);
 		testStateButton20.setStateFocused(true);
-		testStateButton20.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton20.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
-		testStateButton20.putClientProperty("JButton.buttonType", "help");
+		testStateButton20.putClientProperty(FlatClientProperties.BUTTON_TYPE, FlatClientProperties.BUTTON_TYPE_HELP);
 		add(testStateButton20, "cell 3 20 2 1,alignx center,growx 0");
 
 		//---- label24 ----
@@ -625,15 +626,15 @@ class FlatThemePreviewButtons
 
 		//---- testStateButton17 ----
 		testStateButton17.setStatePressed(true);
-		testStateButton17.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton17.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
-		testStateButton17.putClientProperty("JButton.buttonType", "help");
+		testStateButton17.putClientProperty(FlatClientProperties.BUTTON_TYPE, FlatClientProperties.BUTTON_TYPE_HELP);
 		add(testStateButton17, "cell 1 21 2 1,alignx center,growx 0");
 
 		//---- testStateButton21 ----
 		testStateButton21.setStatePressed(true);
 		testStateButton21.setStateFocused(true);
-		testStateButton21.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton21.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
-		testStateButton21.putClientProperty("JButton.buttonType", "help");
+		testStateButton21.putClientProperty(FlatClientProperties.BUTTON_TYPE, FlatClientProperties.BUTTON_TYPE_HELP);
 		add(testStateButton21, "cell 3 21 2 1,alignx center,growx 0");
 
 		//---- label25 ----
@@ -642,8 +643,8 @@ class FlatThemePreviewButtons
 
 		//---- testStateButton18 ----
 		testStateButton18.setEnabled(false);
-		testStateButton18.putClientProperty("JComponent.minimumWidth", 0);
+		testStateButton18.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
-		testStateButton18.putClientProperty("JButton.buttonType", "help");
+		testStateButton18.putClientProperty(FlatClientProperties.BUTTON_TYPE, FlatClientProperties.BUTTON_TYPE_HELP);
 		add(testStateButton18, "cell 1 22 2 1,alignx center,growx 0");
 
 		//---- label26 ----
@@ -651,8 +652,8 @@ class FlatThemePreviewButtons
 		add(label26, "cell 0 23");
 
 		//---- button2 ----
-		button2.putClientProperty("JComponent.minimumWidth", 0);
+		button2.putClientProperty(FlatClientProperties.MINIMUM_WIDTH, 0);
-		button2.putClientProperty("JButton.buttonType", "help");
+		button2.putClientProperty(FlatClientProperties.BUTTON_TYPE, FlatClientProperties.BUTTON_TYPE_HELP);
 		add(button2, "cell 1 23 2 1,alignx center,growx 0");
 
 		//---- buttonGroup1 ----

flatlaf-theme-editor/src/main/java/com/formdev/flatlaf/themeeditor/FlatThemePreviewFonts.java

@@ -85,7 +85,7 @@ public class FlatThemePreviewFonts
 
 		//---- headingsLabel ----
 		headingsLabel.setText("Headings");
-		headingsLabel.putClientProperty("FlatLaf.styleClass", "h3");
+		headingsLabel.putClientProperty(FlatClientProperties.STYLE_CLASS, "h3");
 		add(headingsLabel, "cell 0 0");
 
 		//---- h00Preview ----
@@ -123,7 +123,7 @@ public class FlatThemePreviewFonts
 
 		//---- textLabel ----
 		textLabel.setText("Text");
-		textLabel.putClientProperty("FlatLaf.styleClass", "h3");
+		textLabel.putClientProperty(FlatClientProperties.STYLE_CLASS, "h3");
 		add(textLabel, "cell 0 7");
 
 		//---- largePreview ----
@@ -171,7 +171,7 @@ public class FlatThemePreviewFonts
 
 		//---- scaleValueLabel ----
 		scaleValueLabel.setText("1x");
-		scaleValueLabel.putClientProperty("FlatLaf.styleClass", "h2");
+		scaleValueLabel.putClientProperty(FlatClientProperties.STYLE_CLASS, "h2");
 		add(scaleValueLabel, "cell 0 16");
 		// JFormDesigner - End of component initialization  //GEN-END:initComponents
 	}
@@ -275,7 +275,7 @@ public class FlatThemePreviewFonts
 
 			//---- descLabel ----
 			descLabel.setText("description");
-			descLabel.putClientProperty("FlatLaf.styleClass", "medium");
+			descLabel.putClientProperty(FlatClientProperties.STYLE_CLASS, "medium");
 			add(descLabel, "cell 1 0");
 			// JFormDesigner - End of component initialization  //GEN-END:initComponents
 		}

flatlaf-theme-editor/src/main/java/com/formdev/flatlaf/themeeditor/FlatThemePreviewSwitches.java

@@ -262,25 +262,25 @@ class FlatThemePreviewSwitches
 				//---- zoom1xButton ----
 				zoom1xButton.setText("1x");
 				zoom1xButton.setSelected(true);
-				zoom1xButton.putClientProperty("FlatLaf.styleClass", "small");
+				zoom1xButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 				zoom1xButton.addActionListener(e -> zoomChanged());
 				zoomToolBar.add(zoom1xButton);
 
 				//---- zoom2xButton ----
 				zoom2xButton.setText("2x");
-				zoom2xButton.putClientProperty("FlatLaf.styleClass", "small");
+				zoom2xButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 				zoom2xButton.addActionListener(e -> zoomChanged());
 				zoomToolBar.add(zoom2xButton);
 
 				//---- zoom3xButton ----
 				zoom3xButton.setText("3x");
-				zoom3xButton.putClientProperty("FlatLaf.styleClass", "small");
+				zoom3xButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 				zoom3xButton.addActionListener(e -> zoomChanged());
 				zoomToolBar.add(zoom3xButton);
 
 				//---- zoom4xButton ----
 				zoom4xButton.setText("4x");
-				zoom4xButton.putClientProperty("FlatLaf.styleClass", "small");
+				zoom4xButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 				zoom4xButton.addActionListener(e -> zoomChanged());
 				zoomToolBar.add(zoom4xButton);
 				zoomToolBar.addSeparator();
@@ -288,7 +288,7 @@ class FlatThemePreviewSwitches
 				//---- indeterminateButton ----
 				indeterminateButton.setText("indeterminate");
 				indeterminateButton.setSelected(true);
-				indeterminateButton.putClientProperty("FlatLaf.styleClass", "small");
+				indeterminateButton.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 				indeterminateButton.addActionListener(e -> indeterminateChanged());
 				zoomToolBar.add(indeterminateButton);
 			}
@@ -298,7 +298,7 @@ class FlatThemePreviewSwitches
 
 		//---- label22 ----
 		label22.setText("JCheckBox");
-		label22.putClientProperty("FlatLaf.styleClass", "h3");
+		label22.putClientProperty(FlatClientProperties.STYLE_CLASS, "h3");
 		add(label22, "cell 0 1 3 1");
 
 		//---- label1 ----
@@ -311,32 +311,32 @@ class FlatThemePreviewSwitches
 
 		//---- label23 ----
 		label23.setText("unsel.");
-		label23.putClientProperty("FlatLaf.styleClass", "small");
+		label23.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 		add(label23, "cell 1 3,alignx center,growx 0");
 
 		//---- label28 ----
 		label28.setText("sel.");
-		label28.putClientProperty("FlatLaf.styleClass", "small");
+		label28.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 		add(label28, "cell 2 3,alignx center,growx 0");
 
 		//---- label37 ----
 		label37.setText("ind.");
-		label37.putClientProperty("FlatLaf.styleClass", "small");
+		label37.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 		add(label37, "cell 3 3,alignx center,growx 0");
 
 		//---- label24 ----
 		label24.setText("unsel.");
-		label24.putClientProperty("FlatLaf.styleClass", "small");
+		label24.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 		add(label24, "cell 4 3,alignx center,growx 0");
 
 		//---- label29 ----
 		label29.setText("sel.");
-		label29.putClientProperty("FlatLaf.styleClass", "small");
+		label29.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 		add(label29, "cell 5 3,alignx center,growx 0");
 
 		//---- label38 ----
 		label38.setText("ind.");
-		label38.putClientProperty("FlatLaf.styleClass", "small");
+		label38.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 		add(label38, "cell 6 3,alignx center,growx 0");
 
 		//---- label17 ----
@@ -466,7 +466,7 @@ class FlatThemePreviewSwitches
 
 		//---- label27 ----
 		label27.setText("JRadioButton");
-		label27.putClientProperty("FlatLaf.styleClass", "h3");
+		label27.putClientProperty(FlatClientProperties.STYLE_CLASS, "h3");
 		add(label27, "cell 0 9 3 1");
 
 		//---- label3 ----
@@ -479,22 +479,22 @@ class FlatThemePreviewSwitches
 
 		//---- label25 ----
 		label25.setText("unsel.");
-		label25.putClientProperty("FlatLaf.styleClass", "small");
+		label25.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 		add(label25, "cell 1 11,alignx center,growx 0");
 
 		//---- label30 ----
 		label30.setText("sel.");
-		label30.putClientProperty("FlatLaf.styleClass", "small");
+		label30.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 		add(label30, "cell 2 11,alignx center,growx 0");
 
 		//---- label26 ----
 		label26.setText("unsel.");
-		label26.putClientProperty("FlatLaf.styleClass", "small");
+		label26.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 		add(label26, "cell 4 11,alignx center,growx 0");
 
 		//---- label31 ----
 		label31.setText("sel.");
-		label31.putClientProperty("FlatLaf.styleClass", "small");
+		label31.putClientProperty(FlatClientProperties.STYLE_CLASS, "small");
 		add(label31, "cell 5 11,alignx center,growx 0");
 
 		//---- label36 ----
@@ -672,7 +672,7 @@ class FlatThemePreviewSwitches
 				}
 				@Override
 				public boolean isSelected() {
-					return isStateSelected();
+					return isStateSelected() || isStateIndeterminate();
 				}
 			} );
 

flatlaf-theme-editor/src/main/resources/com/formdev/flatlaf/themeeditor/FlatLafUIKeys.txt

@@ -98,6 +98,10 @@ CheckBox.icon.checkmarkColor
 CheckBox.icon.disabledBackground
 CheckBox.icon.disabledBorderColor
 CheckBox.icon.disabledCheckmarkColor
+CheckBox.icon.disabledIndeterminateBackground
+CheckBox.icon.disabledIndeterminateBorderColor
+CheckBox.icon.disabledIndeterminateBorderWidth
+CheckBox.icon.disabledIndeterminateCheckmarkColor
 CheckBox.icon.disabledSelectedBackground
 CheckBox.icon.disabledSelectedBorderColor
 CheckBox.icon.disabledSelectedBorderWidth
@@ -106,16 +110,29 @@ CheckBox.icon.focusWidth
 CheckBox.icon.focusedBackground
 CheckBox.icon.focusedBorderColor
 CheckBox.icon.focusedCheckmarkColor
+CheckBox.icon.focusedIndeterminateBackground
+CheckBox.icon.focusedIndeterminateBorderColor
+CheckBox.icon.focusedIndeterminateCheckmarkColor
 CheckBox.icon.focusedSelectedBackground
 CheckBox.icon.focusedSelectedBorderColor
 CheckBox.icon.hoverBackground
 CheckBox.icon.hoverBorderColor
 CheckBox.icon.hoverCheckmarkColor
+CheckBox.icon.hoverIndeterminateBackground
+CheckBox.icon.hoverIndeterminateBorderColor
+CheckBox.icon.hoverIndeterminateCheckmarkColor
 CheckBox.icon.hoverSelectedBackground
 CheckBox.icon.hoverSelectedBorderColor
+CheckBox.icon.indeterminateBackground
+CheckBox.icon.indeterminateBorderColor
+CheckBox.icon.indeterminateBorderWidth
+CheckBox.icon.indeterminateCheckmarkColor
 CheckBox.icon.pressedBackground
 CheckBox.icon.pressedBorderColor
 CheckBox.icon.pressedCheckmarkColor
+CheckBox.icon.pressedIndeterminateBackground
+CheckBox.icon.pressedIndeterminateBorderColor
+CheckBox.icon.pressedIndeterminateCheckmarkColor
 CheckBox.icon.pressedSelectedBackground
 CheckBox.icon.pressedSelectedBorderColor
 CheckBox.icon.selectedBackground
@@ -130,6 +147,10 @@ CheckBox.icon[filled].checkmarkColor
 CheckBox.icon[filled].disabledBackground
 CheckBox.icon[filled].disabledBorderColor
 CheckBox.icon[filled].disabledCheckmarkColor
+CheckBox.icon[filled].disabledIndeterminateBackground
+CheckBox.icon[filled].disabledIndeterminateBorderColor
+CheckBox.icon[filled].disabledIndeterminateBorderWidth
+CheckBox.icon[filled].disabledIndeterminateCheckmarkColor
 CheckBox.icon[filled].disabledSelectedBackground
 CheckBox.icon[filled].disabledSelectedBorderColor
 CheckBox.icon[filled].disabledSelectedBorderWidth
@@ -137,16 +158,29 @@ CheckBox.icon[filled].focusWidth
 CheckBox.icon[filled].focusedBackground
 CheckBox.icon[filled].focusedBorderColor
 CheckBox.icon[filled].focusedCheckmarkColor
+CheckBox.icon[filled].focusedIndeterminateBackground
+CheckBox.icon[filled].focusedIndeterminateBorderColor
+CheckBox.icon[filled].focusedIndeterminateCheckmarkColor
 CheckBox.icon[filled].focusedSelectedBackground
 CheckBox.icon[filled].focusedSelectedBorderColor
 CheckBox.icon[filled].hoverBackground
 CheckBox.icon[filled].hoverBorderColor
 CheckBox.icon[filled].hoverCheckmarkColor
+CheckBox.icon[filled].hoverIndeterminateBackground
+CheckBox.icon[filled].hoverIndeterminateBorderColor
+CheckBox.icon[filled].hoverIndeterminateCheckmarkColor
 CheckBox.icon[filled].hoverSelectedBackground
 CheckBox.icon[filled].hoverSelectedBorderColor
+CheckBox.icon[filled].indeterminateBackground
+CheckBox.icon[filled].indeterminateBorderColor
+CheckBox.icon[filled].indeterminateBorderWidth
+CheckBox.icon[filled].indeterminateCheckmarkColor
 CheckBox.icon[filled].pressedBackground
 CheckBox.icon[filled].pressedBorderColor
 CheckBox.icon[filled].pressedCheckmarkColor
+CheckBox.icon[filled].pressedIndeterminateBackground
+CheckBox.icon[filled].pressedIndeterminateBorderColor
+CheckBox.icon[filled].pressedIndeterminateCheckmarkColor
 CheckBox.icon[filled].pressedSelectedBackground
 CheckBox.icon[filled].pressedSelectedBorderColor
 CheckBox.icon[filled].selectedBackground
@@ -435,6 +469,7 @@ Label.disabledShadow
 Label.font
 Label.foreground
 LabelUI
+List.alternateRowColor
 List.background
 List.border
 List.cellFocusColor
@@ -1170,6 +1205,7 @@ ToolTip.foreground
 ToolTip.roundedBorderWidth
 ToolTipManager.enableToolTipMode
 ToolTipUI
+Tree.alternateRowColor
 Tree.ancestorInputMap
 Tree.background
 Tree.border
@@ -1216,6 +1252,7 @@ Tree.showDefaultIcons
 Tree.textBackground
 Tree.textForeground
 Tree.timeFactor
+Tree.wideCellRenderer
 Tree.wideSelection
 TreeUI
 TristateCheckBox.clearMixed.clientProperty

gradle.properties

@@ -14,7 +14,7 @@
 # limitations under the License.
 #
 
-flatlaf.releaseVersion     = 3.5.3
+flatlaf.releaseVersion     = 3.5.4
 flatlaf.developmentVersion = 3.6-SNAPSHOT
 
 org.gradle.parallel = true

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.11.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.12-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME

gradlew

@@ -86,8 +86,7 @@ done
 # shellcheck disable=SC2034
 APP_BASE_NAME=${0##*/}
 # Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
-APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
-' "$PWD" ) || exit
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD=maximum