release 3.4.1

(see issue #824)

.github/workflows/ci.yml

@@ -32,10 +32,11 @@ jobs:
           - 8
           - 11  # LTS
           - 17  # LTS
+          - 21  # LTS
         toolchain: [""]
         include:
-          - java: 17
-            toolchain: 21  # latest
+          - java: 21
+            toolchain: 22  # latest
 
     steps:
       - uses: actions/checkout@v4
@@ -47,7 +48,7 @@ jobs:
         uses: actions/setup-java@v4
         with:
           java-version: ${{ matrix.java }}
-          distribution: temurin  # Java 8, 11 and 17 are pre-installed on ubuntu-latest
+          distribution: temurin  # Java 8, 11, 17 and 21 are pre-installed on ubuntu-latest
           cache: gradle
 
       - name: Check with Error Prone

CHANGELOG.md

@@ -1,6 +1,37 @@
 FlatLaf Change Log
 ==================
 
+## 3.4.1
+
+#### Fixed bugs
+
+- SplitPane: Update divider when client property `JSplitPane.expandableSide`
+  changed.
+- TabbedPane: Fixed swapped back and forward scroll buttons when using
+  `TabbedPane.scrollButtonsPlacement = trailing` (regression in FlatLaf 3.3).
+- Fixed missing window top border on Windows 10 in "full window content" mode.
+  (issue 809)
+- Extras:
+  - `FlatSVGIcon` color filters now support linear gradients. (PR #817)
+  - `FlatSVGIcon`: Use log level `CONFIG` instead of `SEVERE` and allow
+    disabling logging. (issue #823)
+  - Added support for `JSplitPane.expandableSide` client property to
+    `FlatSplitPane`.
+- Native libraries: Added API version check to test whether native library
+  matches the JAR (bad builds could e.g. ship a newer JAR with an older
+  incompatible native library) and to test whether native methods can be invoked
+  (some security software allows loading native library but blocks method
+  invocation).
+- macOS: Fixed crash when running in WebSwing. (issue #826; regression in 3.4)
+
+#### Incompatibilities
+
+- File names of custom properties files for nested Laf classes now must include
+  name of enclosing class name. E.g. nested Laf class `IntelliJTheme.ThemeLaf`
+  used `ThemeLaf.properties` in previous versions, but now needs to be named
+  `IntelliJTheme$ThemeLaf.properties`.
+
+
 ## 3.4
 
 #### New features and improvements

README.md

@@ -311,6 +311,9 @@ Applications using FlatLaf
 
 - ![New](images/new.svg) ![Sponsor](images/sponsor.svg)
   [BGBlitz](https://www.bgblitz.com/) (**commercial**) - professional Backgammon
+- ![New](images/new.svg) [MCreator](https://github.com/MCreator/MCreator) - 
+  software used to make Minecraft Java Edition mods, Minecraft Bedrock Edition Add-Ons, 
+  and data packs without programming knowledge
 - ![New](images/new.svg) [MapTool](https://github.com/RPTools/maptool) - virtual
   Tabletop for playing role-playing games
 - [MegaMek](https://github.com/MegaMek/megamek),

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

@@ -27,7 +27,7 @@ library {
 		}
 		with( linkTask.get() ) {
 			if( name.contains( "Release" ) )
-				debuggable.set( false )
+				debuggable = false
 		}
 	}
 }

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

@@ -44,34 +44,34 @@ publishing {
 
 			pom {
 				afterEvaluate {
-					this@pom.name.set( extension.name )
-					this@pom.description.set( extension.description )
+					this@pom.name = extension.name
+					this@pom.description = extension.description
 				}
-				url.set( "https://github.com/JFormDesigner/FlatLaf" )
+				url = "https://github.com/JFormDesigner/FlatLaf"
 
 				licenses {
 					license {
-						name.set( "The Apache License, Version 2.0" )
-						url.set( "https://www.apache.org/licenses/LICENSE-2.0.txt" )
+						name = "The Apache License, Version 2.0"
+						url = "https://www.apache.org/licenses/LICENSE-2.0.txt"
 					}
 				}
 
 				developers {
 					developer {
-						name.set( "Karl Tauber" )
-						organization.set( "FormDev Software GmbH" )
-						organizationUrl.set( "https://www.formdev.com/" )
+						name = "Karl Tauber"
+						organization = "FormDev Software GmbH"
+						organizationUrl = "https://www.formdev.com/"
 					}
 				}
 
 				scm {
-					connection.set( "scm:git:git://github.com/JFormDesigner/FlatLaf.git" )
-					url.set( "https://github.com/JFormDesigner/FlatLaf" )
+					connection = "scm:git:git://github.com/JFormDesigner/FlatLaf.git"
+					url = "https://github.com/JFormDesigner/FlatLaf"
 				}
 
 				issueManagement {
-					system.set( "GitHub" )
-					url.set( "https://github.com/JFormDesigner/FlatLaf/issues" )
+					system = "GitHub"
+					url = "https://github.com/JFormDesigner/FlatLaf/issues"
 				}
 			}
 

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

@@ -21,6 +21,6 @@ plugins {
 val toolchainJavaVersion = System.getProperty( "toolchain" )
 if( !toolchainJavaVersion.isNullOrEmpty() ) {
 	java.toolchain {
-		languageVersion.set( JavaLanguageVersion.of( toolchainJavaVersion ) )
+		languageVersion = JavaLanguageVersion.of( toolchainJavaVersion )
 	}
 }

flatlaf-core/build.gradle.kts

@@ -27,8 +27,8 @@ plugins {
 val sigtest = configurations.create( "sigtest" )
 
 dependencies {
-	testImplementation( libs.bundles.junit )
-	testRuntimeOnly( libs.junit.engine )
+	testImplementation( libs.junit )
+	testRuntimeOnly( libs.junit.launcher )
 
 	// https://github.com/jtulach/netbeans-apitest
 	sigtest( libs.sigtest )
@@ -42,11 +42,11 @@ java {
 tasks {
 	compileJava {
 		// generate JNI headers
-		options.headerOutputDirectory.set( layout.buildDirectory.dir( "generated/jni-headers" ) )
+		options.headerOutputDirectory = layout.buildDirectory.dir( "generated/jni-headers" )
 	}
 
 	jar {
-		archiveBaseName.set( "flatlaf" )
+		archiveBaseName = "flatlaf"
 
 		doLast {
 			ReorderJarEntries.reorderJarEntries( outputs.files.singleFile );
@@ -54,20 +54,20 @@ tasks {
 	}
 
 	named<Jar>( "sourcesJar" ) {
-		archiveBaseName.set( "flatlaf" )
+		archiveBaseName = "flatlaf"
 	}
 
 	named<Jar>( "javadocJar" ) {
-		archiveBaseName.set( "flatlaf" )
+		archiveBaseName = "flatlaf"
 	}
 
 	register<Zip>( "jarNoNatives" ) {
 		group = "build"
 		dependsOn( "jar" )
 
-		archiveBaseName.set( "flatlaf" )
-		archiveClassifier.set( "no-natives" )
-		archiveExtension.set( "jar" )
+		archiveBaseName = "flatlaf"
+		archiveClassifier = "no-natives"
+		archiveExtension = "jar"
 		destinationDirectory = layout.buildDirectory.dir( "libs" )
 
 		from( zipTree( jar.get().archiveFile.get().asFile ) )

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

@@ -102,6 +102,17 @@ public interface FlatClientProperties
 	 */
 	String BUTTON_TYPE_BORDERLESS = "borderless";
 
+	/**
+	 * Specifies whether the button preferred size will be made square (quadratically).
+	 * <p>
+	 * <strong>Components</strong> {@link javax.swing.JButton} and {@link javax.swing.JToggleButton}<br>
+	 * <strong>Value type</strong> {@link java.lang.Boolean}
+	 */
+	String SQUARE_SIZE = "JButton.squareSize";
+
+
+	//---- JCheckBox ----------------------------------------------------------
+
 	/**
 	 * Specifies selected state of a checkbox.
 	 * <p>
@@ -118,14 +129,6 @@ public interface FlatClientProperties
 	 */
 	String SELECTED_STATE_INDETERMINATE = "indeterminate";
 
-	/**
-	 * Specifies whether the button preferred size will be made square (quadratically).
-	 * <p>
-	 * <strong>Components</strong> {@link javax.swing.JButton} and {@link javax.swing.JToggleButton}<br>
-	 * <strong>Value type</strong> {@link java.lang.Boolean}
-	 */
-	String SQUARE_SIZE = "JButton.squareSize";
-
 
 	//---- JComponent ---------------------------------------------------------
 
@@ -984,7 +987,7 @@ public interface FlatClientProperties
 	 * <strong>Component</strong> {@link javax.swing.JTabbedPane}<br>
 	 * <strong>Value type</strong> {@link java.lang.Integer} or {@link java.lang.String}<br>
 	 * <strong>Allowed Values</strong>
-	 *     {@link SwingConstants#LEADING} (default)
+	 *     {@link SwingConstants#LEADING} (default),
 	 *     {@link SwingConstants#TRAILING},
 	 *     {@link SwingConstants#CENTER},
 	 *     {@link #TABBED_PANE_ALIGN_LEADING} (default),
@@ -1096,7 +1099,7 @@ public interface FlatClientProperties
 	 * <strong>Allowed Values</strong>
 	 *     {@link SwingConstants#LEFT},
 	 *     {@link SwingConstants#RIGHT},
-	 *     {@link #TABBED_PANE_TAB_ROTATION_NONE}, (default)
+	 *     {@link #TABBED_PANE_TAB_ROTATION_NONE} (default),
 	 *     {@link #TABBED_PANE_TAB_ROTATION_AUTO},
 	 *     {@link #TABBED_PANE_TAB_ROTATION_LEFT} or
 	 *     {@link #TABBED_PANE_TAB_ROTATION_RIGHT}
@@ -1345,8 +1348,8 @@ public interface FlatClientProperties
 	 * <p>
 	 * <strong>Component</strong> {@link javax.swing.JToggleButton}<br>
 	 * <strong>Value type</strong> {@link java.lang.Integer}<br>
-	 * <strong>SupportedValues:</strong>
-	 *     {@link SwingConstants#BOTTOM} (default)
+	 * <strong>Allowed Values</strong>
+	 *     {@link SwingConstants#BOTTOM} (default),
 	 *     {@link SwingConstants#TOP},
 	 *     {@link SwingConstants#LEFT} or
 	 *     {@link SwingConstants#RIGHT}

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

@@ -48,7 +48,7 @@ public abstract class FlatDefaultsAddon
 	public InputStream getDefaults( Class<?> lafClass ) {
 		Class<?> addonClass = this.getClass();
 		String propertiesName = '/' + addonClass.getPackage().getName().replace( '.', '/' )
-			+ '/' + lafClass.getSimpleName() + ".properties";
+			+ '/' + UIDefaultsLoader.simpleClassName( lafClass ) + ".properties";
 		return addonClass.getResourceAsStream( propertiesName );
 	}
 

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

@@ -161,7 +161,7 @@ class UIDefaultsLoader
 						classLoader = FlatLaf.class.getClassLoader();
 
 					for( Class<?> lafClass : lafClasses ) {
-						String propertiesName = packageName + '/' + lafClass.getSimpleName() + ".properties";
+						String propertiesName = packageName + '/' + simpleClassName( lafClass ) + ".properties";
 						try( InputStream in = classLoader.getResourceAsStream( propertiesName ) ) {
 							if( in != null )
 								properties.load( in );
@@ -171,7 +171,7 @@ class UIDefaultsLoader
 					// load from package URL
 					URL packageUrl = (URL) source;
 					for( Class<?> lafClass : lafClasses ) {
-						URL propertiesUrl = new URL( packageUrl + lafClass.getSimpleName() + ".properties" );
+						URL propertiesUrl = new URL( packageUrl + simpleClassName( lafClass ) + ".properties" );
 
 						try( InputStream in = propertiesUrl.openStream() ) {
 							properties.load( in );
@@ -183,7 +183,7 @@ class UIDefaultsLoader
 					// load from folder
 					File folder = (File) source;
 					for( Class<?> lafClass : lafClasses ) {
-						File propertiesFile = new File( folder, lafClass.getSimpleName() + ".properties" );
+						File propertiesFile = new File( folder, simpleClassName( lafClass ) + ".properties" );
 						if( !propertiesFile.isFile() )
 							continue;
 
@@ -294,6 +294,14 @@ class UIDefaultsLoader
 		}
 	}
 
+	/**
+	 * Similar to Class.getSimpleName(), but includes enclosing class for nested classes.
+	 */
+	static String simpleClassName( Class<?> cls ) {
+		String className = cls.getName();
+		return className.substring( className.lastIndexOf( '.' ) + 1 );
+	}
+
 	static void logParseError( String key, String value, RuntimeException ex, boolean severe ) {
 		String message = "FlatLaf: Failed to parse: '" + key + '=' + value + '\'';
 		if( severe )

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

@@ -37,16 +37,18 @@ class FlatNativeLibrary
 	private static boolean initialized;
 	private static NativeLibrary nativeLibrary;
 
+	private native static int getApiVersion();
+
 	/**
 	 * Loads native library (if available) and returns whether loaded successfully.
 	 * Returns {@code false} if no native library is available.
 	 */
-	static synchronized boolean isLoaded() {
-		initialize();
+	static synchronized boolean isLoaded( int apiVersion ) {
+		initialize( apiVersion );
 		return (nativeLibrary != null) ? nativeLibrary.isLoaded() : false;
 	}
 
-	private static void initialize() {
+	private static void initialize( int apiVersion ) {
 		if( initialized )
 			return;
 		initialized = true;
@@ -104,7 +106,26 @@ class FlatNativeLibrary
 			return; // no native library available for current OS or CPU architecture
 
 		// load native library
-		nativeLibrary = createNativeLibrary( classifier, ext );
+		NativeLibrary nativeLibrary = createNativeLibrary( classifier, ext );
+		if( !nativeLibrary.isLoaded() )
+			return;
+
+		// check API version (and check whether library works)
+		try {
+			int actualApiVersion = getApiVersion();
+			if( actualApiVersion != apiVersion ) {
+				LoggingFacade.INSTANCE.logSevere( "FlatLaf: Wrong API version in native library (expected "
+					+ apiVersion + ", actual " + actualApiVersion + "). Ignoring native library.", null );
+				return;
+			}
+		} catch( Throwable ex ) {
+			// could be a UnsatisfiedLinkError in case that loading native library
+			// from temp directory was blocked by some OS security mechanism
+			LoggingFacade.INSTANCE.logSevere( "FlatLaf: Failed to get API version of native library. Ignoring native library.", ex );
+			return;
+		}
+
+		FlatNativeLibrary.nativeLibrary = nativeLibrary;
 	}
 
 	private static NativeLibrary createNativeLibrary( String classifier, String ext ) {
@@ -118,9 +139,9 @@ class FlatNativeLibrary
 				if( library.isLoaded() )
 					return library;
 
-				LoggingFacade.INSTANCE.logSevere( "Did not find library '" + System.mapLibraryName( libraryName )
-					+ "' in java.library.path '" + System.getProperty( "java.library.path" )
-					+ "', using extracted library instead", null );
+				LoggingFacade.INSTANCE.logSevere( "FlatLaf: Native library '" + System.mapLibraryName( libraryName )
+					+ "' not found in java.library.path '" + System.getProperty( "java.library.path" )
+					+ "'. Using extracted native library instead.", null );
 			} else {
 				// try standard library naming scheme
 				// (same as in flatlaf.jar in package 'com/formdev/flatlaf/natives')
@@ -139,11 +160,11 @@ class FlatNativeLibrary
 						return new NativeLibrary( libraryFile2, true );
 				}
 
-				LoggingFacade.INSTANCE.logSevere( "Did not find library '"
+				LoggingFacade.INSTANCE.logSevere( "FlatLaf: Native library '"
 					+ libraryFile.getName()
 					+ (libraryName2 != null ? ("' or '" + libraryName2) : "")
-					+ "' in '" + libraryFile.getParentFile().getAbsolutePath()
-					+ "', using extracted library instead", null );
+					+ "' not found in '" + libraryFile.getParentFile().getAbsolutePath()
+					+ "'. Using extracted native library instead.", null );
 			}
 		}
 

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

@@ -35,6 +35,8 @@ import com.formdev.flatlaf.util.SystemInfo;
  */
 class FlatNativeLinuxLibrary
 {
+	private static int API_VERSION_LINUX = 3001;
+
 	/**
 	 * Checks whether native library is loaded/available.
 	 * <p>
@@ -42,7 +44,7 @@ class FlatNativeLinuxLibrary
 	 *              method of this class. Otherwise, the native library may not be loaded.
 	 */
 	static boolean isLoaded() {
-		return SystemInfo.isLinux && FlatNativeLibrary.isLoaded();
+		return SystemInfo.isLinux && FlatNativeLibrary.isLoaded( API_VERSION_LINUX );
 	}
 
 	// direction for _NET_WM_MOVERESIZE message

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

@@ -44,6 +44,8 @@ import com.formdev.flatlaf.util.SystemInfo;
  */
 public class FlatNativeMacLibrary
 {
+	private static int API_VERSION_MACOS = 2001;
+
 	/**
 	 * Checks whether native library is loaded/available.
 	 * <p>
@@ -51,7 +53,7 @@ public class FlatNativeMacLibrary
 	 *              method of this class. Otherwise, the native library may not be loaded.
 	 */
 	public static boolean isLoaded() {
-		return SystemInfo.isMacOS && FlatNativeLibrary.isLoaded();
+		return SystemInfo.isMacOS && FlatNativeLibrary.isLoaded( API_VERSION_MACOS );
 	}
 
 	public native static boolean setWindowRoundedBorder( Window window, float radius, float borderWidth, int borderColor );

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

@@ -30,6 +30,8 @@ import com.formdev.flatlaf.util.SystemInfo;
  */
 public class FlatNativeWindowsLibrary
 {
+	private static int API_VERSION_WINDOWS = 1001;
+
 	private static long osBuildNumber = Long.MIN_VALUE;
 
 	/**
@@ -39,7 +41,7 @@ public class FlatNativeWindowsLibrary
 	 *              method of this class. Otherwise, the native library may not be loaded.
 	 */
 	public static boolean isLoaded() {
-		return SystemInfo.isWindows && FlatNativeLibrary.isLoaded();
+		return SystemInfo.isWindows && FlatNativeLibrary.isLoaded( API_VERSION_WINDOWS );
 	}
 
 	/**

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

@@ -270,6 +270,7 @@ public class FlatRootPaneUI
 	// layer title pane under frame content layer to allow placing menu bar over title pane
 	protected final static Integer TITLE_PANE_LAYER = JLayeredPane.FRAME_CONTENT_LAYER - 1;
 	private final static Integer TITLE_PANE_MOUSE_LAYER = JLayeredPane.FRAME_CONTENT_LAYER - 2;
+	private final static Integer WINDOW_TOP_BORDER_LAYER = Integer.MAX_VALUE;
 
 	// for fullWindowContent mode, layer title pane over frame content layer to allow placing title bar buttons over content
 	/** @since 3.4 */
@@ -285,11 +286,15 @@ public class FlatRootPaneUI
 		if( titlePane != null ) {
 			layeredPane.remove( titlePane );
 			layeredPane.remove( titlePane.mouseLayer );
+			if( titlePane.windowTopBorderLayer != null )
+				layeredPane.remove( titlePane.windowTopBorderLayer );
 		}
 
 		if( newTitlePane != null ) {
 			layeredPane.add( newTitlePane, getLayerForTitlePane() );
 			layeredPane.add( newTitlePane.mouseLayer, TITLE_PANE_MOUSE_LAYER );
+			if( newTitlePane.windowTopBorderLayer != null && newTitlePane.isWindowTopBorderNeeded() && isFullWindowContent( rootPane ) )
+				layeredPane.add( newTitlePane.windowTopBorderLayer, WINDOW_TOP_BORDER_LAYER );
 		}
 
 		titlePane = newTitlePane;
@@ -446,6 +451,13 @@ public class FlatRootPaneUI
 			case FlatClientProperties.FULL_WINDOW_CONTENT:
 				if( titlePane != null ) {
 					rootPane.getLayeredPane().setLayer( titlePane, getLayerForTitlePane() );
+					if( titlePane.windowTopBorderLayer != null ) {
+						JLayeredPane layeredPane = rootPane.getLayeredPane();
+						if( titlePane.isWindowTopBorderNeeded() && isFullWindowContent( rootPane ) )
+							layeredPane.add( titlePane.windowTopBorderLayer, WINDOW_TOP_BORDER_LAYER );
+						else
+							layeredPane.remove( titlePane.windowTopBorderLayer );
+					}
 					titlePane.updateIcon();
 					titlePane.updateVisibility();
 					titlePane.updateFullWindowContentButtonsBoundsProperty();
@@ -591,6 +603,12 @@ public class FlatRootPaneUI
 					titlePane.setBounds( 0, 0, width, prefHeight );
 
 				titlePane.mouseLayer.setBounds( 0, 0, width, prefHeight );
+				if( titlePane.windowTopBorderLayer != null ) {
+					boolean show = isFullWindowContent && !titlePane.isWindowMaximized() && !isFullScreen;
+					if( show )
+						titlePane.windowTopBorderLayer.setBounds( 0, 0, width, 1 );
+					titlePane.windowTopBorderLayer.setVisible( show );
+				}
 
 				if( !isFullWindowContent )
 					nextY += prefHeight;

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

@@ -301,6 +301,10 @@ public class FlatSplitPaneUI
 					// necessary to show/hide one-touch buttons on expand/collapse
 					doLayout();
 					break;
+
+				case FlatClientProperties.SPLIT_PANE_EXPANDABLE_SIDE:
+					revalidate();
+					break;
 			}
 		}
 

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

@@ -3767,9 +3767,20 @@ debug*/
 			boolean hideDisabledScrollButtons = (scrollButtonsPolicy == AS_NEEDED_SINGLE && scrollButtonsPlacement == BOTH);
 			boolean trailingScrollButtons = (scrollButtonsPlacement == TRAILING);
 
-			// for right-to-left always use "more tabs" button for horizontal scrolling
+			// For right-to-left, always use "more tabs" button for horizontal scrolling
 			// because methods scrollForward() and scrollBackward() in class
-			// BasicTabbedPaneUI.ScrollableTabSupport do not work for right-to-left
+			// BasicTabbedPaneUI.ScrollableTabSupport do not work for right-to-left.
+			//
+			// One problem is that BasicTabbedPaneUI.getClosestTab(), which is used
+			// to compute leadingTabIndex, does not work for right-to-left because is uses "binary" search
+			// on rects[] to find tab, but rects[] is ordered in reverse order for right-to-left.
+			// So leadingTabIndex is either zero or tabCount.
+			// Therefore increasing/decreasing leadingTabIndex in scrollForward()
+			// and scrollBackward() does not work as expected.
+			// Also backward/forward scroll buttons are not correctly enabled/disabled.
+			//
+			// Fixing this would require replacing nearly whole functionality of class
+			// BasicTabbedPaneUI.ScrollableTabSupport, which is not possible because it is private.
 			boolean leftToRight = isLeftToRight();
 			if( !leftToRight && isHorizontalTabPlacement( tabPane.getTabPlacement() ) ) {
 				useMoreTabsButton = true;
@@ -3851,6 +3862,8 @@ debug*/
 							w -= buttonWidth;
 							moreTabsButtonVisible = true;
 						}
+
+						// layout scroll buttons
 						if( useScrollButtons ) {
 							// the tabViewport view size is set in
 							// BasicTabbedPaneUI.TabbedPaneScrollLayout.calculateTabRects(),
@@ -3858,30 +3871,28 @@ debug*/
 							Point viewPosition = tabViewport.getViewPosition();
 							Dimension viewSize = tabViewport.getViewSize();
 
+							// layout forward button on trailing side
+							if( !hideDisabledScrollButtons || viewSize.width - viewPosition.x > w ) {
+								int buttonWidth = forwardButton.getPreferredSize().width;
+								forwardButton.setBounds( x + w - buttonWidth, y, buttonWidth, h );
+								w -= buttonWidth;
+								forwardButtonVisible = true;
+							}
+
 							// layout backward button
 							if( !hideDisabledScrollButtons || viewPosition.x > 0 ) {
 								int buttonWidth = backwardButton.getPreferredSize().width;
 								if( trailingScrollButtons ) {
 									// on trailing side
-									backwardButton.setBounds( leftToRight ? (x + w - buttonWidth) : x, y, buttonWidth, h );
-									x += leftToRight ? 0 : buttonWidth;
+									backwardButton.setBounds( x + w - buttonWidth, y, buttonWidth, h );
 								} else {
 									// on leading side
-									backwardButton.setBounds( leftToRight ? x : (x + w - buttonWidth), y, buttonWidth, h );
-									x += leftToRight ? buttonWidth : 0;
+									backwardButton.setBounds( x, y, buttonWidth, h );
+									x += buttonWidth;
 								}
 								w -= buttonWidth;
 								backwardButtonVisible = true;
 							}
-
-							// layout forward button on trailing side
-							if( !hideDisabledScrollButtons || viewSize.width - viewPosition.x > w ) {
-								int buttonWidth = forwardButton.getPreferredSize().width;
-								forwardButton.setBounds( leftToRight ? (x + w - buttonWidth) : x, y, buttonWidth, h );
-								x += leftToRight ? 0 : buttonWidth;
-								w -= buttonWidth;
-								forwardButtonVisible = true;
-							}
 						}
 					}
 
@@ -3927,6 +3938,8 @@ debug*/
 							h -= buttonHeight;
 							moreTabsButtonVisible = true;
 						}
+
+						// layout scroll buttons
 						if( useScrollButtons ) {
 							// the tabViewport view size is set in
 							// BasicTabbedPaneUI.TabbedPaneScrollLayout.calculateTabRects(),
@@ -3934,6 +3947,14 @@ debug*/
 							Point viewPosition = tabViewport.getViewPosition();
 							Dimension viewSize = tabViewport.getViewSize();
 
+							// layout forward button on bottom side
+							if( !hideDisabledScrollButtons || viewSize.height - viewPosition.y > h ) {
+								int buttonHeight = forwardButton.getPreferredSize().height;
+								forwardButton.setBounds( x, y + h - buttonHeight, w, buttonHeight );
+								h -= buttonHeight;
+								forwardButtonVisible = true;
+							}
+
 							// layout backward button
 							if( !hideDisabledScrollButtons || viewPosition.y > 0 ) {
 								int buttonHeight = backwardButton.getPreferredSize().height;
@@ -3948,14 +3969,6 @@ debug*/
 								h -= buttonHeight;
 								backwardButtonVisible = true;
 							}
-
-							// layout forward button on bottom side
-							if( !hideDisabledScrollButtons || viewSize.height - viewPosition.y > h ) {
-								int buttonHeight = forwardButton.getPreferredSize().height;
-								forwardButton.setBounds( x, y + h - buttonHeight, w, buttonHeight );
-								h -= buttonHeight;
-								forwardButtonVisible = true;
-							}
 						}
 					}
 

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

@@ -110,6 +110,7 @@ public class FlatTitlePane
 	extends JComponent
 {
 	static final String KEY_DEBUG_SHOW_RECTANGLES = "FlatLaf.debug.titlebar.showRectangles";
+	private static final boolean isWindows_10 = SystemInfo.isWindows_10_orLater && !SystemInfo.isWindows_11_orLater;
 
 	/** @since 2.5 */ protected final Font titleFont;
 	protected final Color activeBackground;
@@ -166,6 +167,16 @@ public class FlatTitlePane
 	 */
 	final JPanel mouseLayer;
 
+	/**
+	 * This panel paint a border at the top of the window in fullWindowContent mode,
+	 * if FlatLaf window decorations are enabled.
+	 * Only used on Windows 10.
+	 * <p>
+	 * This panel is not a child of the title pane.
+	 * Instead it is added by FlatRootPaneUI to the layered pane at a layer over all other layers.
+	 */
+	final JPanel windowTopBorderLayer;
+
 	public FlatTitlePane( JRootPane rootPane ) {
 		this.rootPane = rootPane;
 
@@ -207,6 +218,14 @@ public class FlatTitlePane
 		mouseLayer.addMouseListener( handler );
 		mouseLayer.addMouseMotionListener( handler );
 
+		if( isWindows_10 && FlatNativeWindowBorder.isSupported() ) {
+			windowTopBorderLayer = new JPanel();
+			windowTopBorderLayer.setVisible( false );
+			windowTopBorderLayer.setOpaque( false );
+			windowTopBorderLayer.setBorder( FlatUIUtils.nonUIResource( FlatNativeWindowBorder.WindowTopBorder.getInstance() ) );
+		} else
+			windowTopBorderLayer = null;
+
 		applyComponentOrientation( rootPane.getComponentOrientation() );
 	}
 
@@ -919,6 +938,10 @@ public class FlatTitlePane
 		return window != null && FlatNativeWindowBorder.hasCustomDecoration( window );
 	}
 
+	boolean isWindowTopBorderNeeded() {
+		return isWindows_10 && hasNativeCustomDecoration();
+	}
+
 	// used to invoke updateNativeTitleBarHeightAndHitTestSpots() only once from latest invokeLater()
 	private int laterCounter;
 
@@ -1146,7 +1169,7 @@ public class FlatTitlePane
 			} else if( borderColor != null && (rootPane.getJMenuBar() == null || !rootPane.getJMenuBar().isVisible()) )
 				insets.bottom += UIScale.scale( 1 );
 
-			if( !SystemInfo.isWindows_11_orLater && hasNativeCustomDecoration() && !isWindowMaximized() )
+			if( isWindowTopBorderNeeded() && !isWindowMaximized() )
 				insets = FlatUIUtils.addInsets( insets, WindowTopBorder.getInstance().getBorderInsets() );
 
 			return insets;
@@ -1165,7 +1188,7 @@ public class FlatTitlePane
 				FlatUIUtils.paintFilledRectangle( g, borderColor, x, y + height - lineHeight, width, lineHeight );
 			}
 
-			if( !SystemInfo.isWindows_11_orLater && hasNativeCustomDecoration() && !isWindowMaximized() )
+			if( isWindowTopBorderNeeded() && !isWindowMaximized() && !isFullWindowContent() )
 				WindowTopBorder.getInstance().paintBorder( c, g, x, y, width, height );
 		}
 
@@ -1329,7 +1352,7 @@ public class FlatTitlePane
 			activeChanged( true );
 			updateNativeTitleBarHeightAndHitTestSpots();
 
-			if( !SystemInfo.isWindows_11_orLater && hasNativeCustomDecoration() )
+			if( isWindowTopBorderNeeded() )
 				WindowTopBorder.getInstance().repaintBorder( FlatTitlePane.this );
 
 			repaintWindowBorder();
@@ -1340,7 +1363,7 @@ public class FlatTitlePane
 			activeChanged( false );
 			updateNativeTitleBarHeightAndHitTestSpots();
 
-			if( !SystemInfo.isWindows_11_orLater && hasNativeCustomDecoration() )
+			if( isWindowTopBorderNeeded() )
 				WindowTopBorder.getInstance().repaintBorder( FlatTitlePane.this );
 
 			repaintWindowBorder();

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

@@ -89,7 +89,7 @@ class FlatWindowsNativeWindowBorder
 			return null;
 
 		// check whether native library was successfully loaded
-		if( !FlatNativeLibrary.isLoaded() )
+		if( !FlatNativeWindowsLibrary.isLoaded() )
 			return null;
 
 		// create new instance

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

@@ -25,6 +25,7 @@ import java.awt.Image;
 import java.awt.Paint;
 import java.awt.Rectangle;
 import java.awt.RenderingHints;
+import java.awt.LinearGradientPaint;
 import java.awt.image.BufferedImage;
 import java.awt.image.RGBImageFilter;
 import java.io.File;
@@ -62,6 +63,8 @@ public class FlatSVGIcon
 	extends ImageIcon
 	implements DisabledIconProvider
 {
+	private static boolean loggingEnabled = true;
+	private static boolean svgCacheEnabled = true;
 	// cache that uses soft references for values, which allows freeing SVG documents if no longer used
 	private static final SoftCache<String, SVGDocument> svgCache = new SoftCache<>();
 	private static final SVGLoader svgLoader = new SVGLoader();
@@ -271,7 +274,8 @@ public class FlatSVGIcon
 
 			if( document == null ) {
 				loadFailed = true;
-				LoggingFacade.INSTANCE.logSevere( "FlatSVGIcon: failed to load SVG icon from input stream", null );
+				if( loggingEnabled )
+					LoggingFacade.INSTANCE.logConfig( "FlatSVGIcon: failed to load SVG icon from input stream", null );
 			}
 		}
 	}
@@ -449,8 +453,9 @@ public class FlatSVGIcon
 	 * @param colorFilter The color filter
 	 * @since 1.2
 	 */
-	public void setColorFilter( ColorFilter colorFilter ) {
+	public FlatSVGIcon setColorFilter( ColorFilter colorFilter ) {
 		this.colorFilter = colorFilter;
+		return this;
 	}
 
 	private void update() {
@@ -474,7 +479,8 @@ public class FlatSVGIcon
 
 			if( url == null ) {
 				loadFailed = true;
-				LoggingFacade.INSTANCE.logConfig( "FlatSVGIcon: resource '" + name + "' not found (if using Java modules, check whether icon package is opened in module-info.java)", null );
+				if( loggingEnabled )
+					LoggingFacade.INSTANCE.logConfig( "FlatSVGIcon: resource '" + name + "' not found (if using Java modules, check whether icon package is opened in module-info.java)", null );
 				return;
 			}
 		}
@@ -484,6 +490,9 @@ public class FlatSVGIcon
 	}
 
 	static synchronized SVGDocument loadSVG( URL url ) {
+		if( !svgCacheEnabled )
+			return loadSVGUncached( url );
+
 		// get from our cache
 		String cacheKey = url.toString();
 		SVGDocument document = svgCache.get( cacheKey );
@@ -491,18 +500,25 @@ public class FlatSVGIcon
 			return document;
 
 		// load SVG document
-		document = svgLoader.load( url );
-
-		if( document == null ) {
-			LoggingFacade.INSTANCE.logSevere( "FlatSVGIcon: failed to load '" + url + "'", null );
-			return null;
-		}
+		document = loadSVGUncached( url );
 
 		svgCache.put( cacheKey, document );
 
 		return document;
 	}
 
+	private static SVGDocument loadSVGUncached( URL url ) {
+		SVGDocument document = svgLoader.load( url );
+
+		if( document == null ) {
+			if( loggingEnabled )
+				LoggingFacade.INSTANCE.logConfig( "FlatSVGIcon: failed to load '" + url + "'", null );
+			return null;
+		}
+
+		return document;
+	}
+
 	private URL getIconURL( String name, boolean dark ) {
 		if( dark ) {
 			int dotIndex = name.lastIndexOf( '.' );
@@ -611,7 +627,10 @@ public class FlatSVGIcon
 	}
 
 	private void paintSvgError( Graphics2D g, int x, int y ) {
-		g.setColor( Color.red );
+		if( g instanceof GraphicsFilter )
+			((GraphicsFilter)g).setColorUnfiltered( Color.red );
+		else
+			g.setColor( Color.red );
 		g.fillRect( x, y, getIconWidth(), getIconHeight() );
 	}
 
@@ -692,6 +711,34 @@ public class FlatSVGIcon
 		darkLaf = FlatLaf.isLafDark();
 	}
 
+	/** @since 3.4.1 */
+	public static boolean isLoggingEnabled() {
+		return loggingEnabled;
+	}
+
+	/** @since 3.4.1 */
+	public static void setLoggingEnabled( boolean loggingEnabled ) {
+		FlatSVGIcon.loggingEnabled = loggingEnabled;
+	}
+
+	/** @since 3.4.1 */
+	public static boolean isSVGDocumentEnabled() {
+		return svgCacheEnabled;
+	}
+
+	/** @since 3.4.1 */
+	public static void setSVGDocumentEnabled( boolean svgCacheEnabled ) {
+		FlatSVGIcon.svgCacheEnabled = svgCacheEnabled;
+
+		if( !svgCacheEnabled )
+			clearSVGDocumentCache();
+	}
+
+	/** @since 3.4.1 */
+	public static void clearSVGDocumentCache() {
+		svgCache.clear();
+	}
+
 	//---- class ColorFilter --------------------------------------------------
 
 	/**
@@ -978,10 +1025,23 @@ public class FlatSVGIcon
 			super.setColor( filterColor( c ) );
 		}
 
+		void setColorUnfiltered( Color c ) {
+			super.setColor( c );
+		}
+
 		@Override
 		public void setPaint( Paint paint ) {
 			if( paint instanceof Color )
 				paint = filterColor( (Color) paint );
+			else if( paint instanceof LinearGradientPaint ) {
+				LinearGradientPaint oldPaint = (LinearGradientPaint) paint;
+				Color[] newColors = filterColors( oldPaint.getColors() );
+				if( newColors != null ) {
+					paint = new LinearGradientPaint( oldPaint.getStartPoint(), oldPaint.getEndPoint(),
+						oldPaint.getFractions(), newColors, oldPaint.getCycleMethod(),
+						oldPaint.getColorSpace(), oldPaint.getTransform() );
+				}
+			}
 			super.setPaint( paint );
 		}
 
@@ -1001,5 +1061,15 @@ public class FlatSVGIcon
 			}
 			return color;
 		}
+
+		private Color[] filterColors( Color[] colors ) {
+			Color[] newColors = new Color[colors.length];
+			boolean changed = false;
+			for( int i = 0; i < colors.length; i++ ) {
+				newColors[i] = filterColor( colors[i] );
+				changed = (changed || newColors[i] != colors[i]);
+			}
+			return changed ? newColors : null;
+		}
 	}
 }

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

@@ -16,6 +16,7 @@
 
 package com.formdev.flatlaf.extras.components;
 
+import static com.formdev.flatlaf.FlatClientProperties.*;
 import javax.swing.JSplitPane;
 
 /**
@@ -26,6 +27,29 @@ import javax.swing.JSplitPane;
  */
 public class FlatSplitPane
 	extends JSplitPane
-	implements FlatStyleableComponent
+	implements FlatComponentExtension, FlatStyleableComponent
 {
+	// NOTE: enum names must be equal to allowed strings
+	/** @since 3.4.1 */ public enum ExpandableSide { both, left, right }
+
+	/**
+	 * Returns what side of the spilt pane is allowed to expand
+	 * via one-touch expanding arrow buttons.
+	 *
+	 * @since 3.4.1
+	 */
+	public ExpandableSide getExpandableSide() {
+		return getClientPropertyEnumString( SPLIT_PANE_EXPANDABLE_SIDE, ExpandableSide.class,
+			null, ExpandableSide.both );
+	}
+
+	/**
+	 * Specifies what side of the spilt pane is allowed to expand
+	 * via one-touch expanding arrow buttons.
+	 *
+	 * @since 3.4.1
+	 */
+	public void setExpandableSide( ExpandableSide expandableSide ) {
+		putClientPropertyEnumString( SPLIT_PANE_EXPANDABLE_SIDE, expandableSide );
+	}
 }

flatlaf-fonts/flatlaf-fonts-inter/build.gradle.kts

@@ -33,8 +33,8 @@ plugins {
 dependencies {
 	implementation( project( ":flatlaf-core" ) )
 
-	testImplementation( libs.bundles.junit )
-	testRuntimeOnly( libs.junit.engine )
+	testImplementation( libs.junit )
+	testRuntimeOnly( libs.junit.launcher )
 }
 
 flatlafModuleInfo {
@@ -73,8 +73,8 @@ publishing {
 			pom {
 				licenses {
 					license {
-						name.set( "SIL OPEN FONT LICENSE Version 1.1" )
-						url.set( "https://choosealicense.com/licenses/ofl-1.1/" )
+						name = "SIL OPEN FONT LICENSE Version 1.1"
+						url = "https://choosealicense.com/licenses/ofl-1.1/"
 					}
 				}
 			}

flatlaf-fonts/flatlaf-fonts-jetbrains-mono/build.gradle.kts

@@ -33,8 +33,8 @@ plugins {
 dependencies {
 	implementation( project( ":flatlaf-core" ) )
 
-	testImplementation( libs.bundles.junit )
-	testRuntimeOnly( libs.junit.engine )
+	testImplementation( libs.junit )
+	testRuntimeOnly( libs.junit.launcher )
 }
 
 flatlafModuleInfo {
@@ -73,8 +73,8 @@ publishing {
 			pom {
 				licenses {
 					license {
-						name.set( "SIL OPEN FONT LICENSE Version 1.1" )
-						url.set( "https://choosealicense.com/licenses/ofl-1.1/" )
+						name = "SIL OPEN FONT LICENSE Version 1.1"
+						url = "https://choosealicense.com/licenses/ofl-1.1/"
 					}
 				}
 			}

flatlaf-fonts/flatlaf-fonts-roboto-mono/build.gradle.kts

@@ -33,8 +33,8 @@ plugins {
 dependencies {
 	implementation( project( ":flatlaf-core" ) )
 
-	testImplementation( libs.bundles.junit )
-	testRuntimeOnly( libs.junit.engine )
+	testImplementation( libs.junit )
+	testRuntimeOnly( libs.junit.launcher )
 }
 
 flatlafModuleInfo {

flatlaf-fonts/flatlaf-fonts-roboto/build.gradle.kts

@@ -33,8 +33,8 @@ plugins {
 dependencies {
 	implementation( project( ":flatlaf-core" ) )
 
-	testImplementation( libs.bundles.junit )
-	testRuntimeOnly( libs.junit.engine )
+	testImplementation( libs.junit )
+	testRuntimeOnly( libs.junit.launcher )
 }
 
 flatlafModuleInfo {

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

@@ -21,11 +21,14 @@ plugins {
 }
 
 flatlafJniHeaders {
-	headers = listOf( "com_formdev_flatlaf_ui_FlatNativeLinuxLibrary.h" )
+	headers = listOf(
+		"com_formdev_flatlaf_ui_FlatNativeLibrary.h",
+		"com_formdev_flatlaf_ui_FlatNativeLinuxLibrary.h"
+	)
 }
 
 library {
-	targetMachines.set( listOf( machines.linux.x86_64 ) )
+	targetMachines = listOf( machines.linux.x86_64 )
 }
 
 var javaHome = System.getProperty( "java.home" )

flatlaf-natives/flatlaf-natives-linux/src/main/cpp/ApiVersion.cpp

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2024 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.
+ */
+
+#include <jni.h>
+#include "com_formdev_flatlaf_ui_FlatNativeLibrary.h"
+
+/**
+ * @author Karl Tauber
+ */
+
+
+// increase this version if changing API or functionality of native library
+// also update version in Java class com.formdev.flatlaf.ui.FlatNativeLinuxLibrary
+#define API_VERSION_LINUX		3001
+
+
+//---- JNI methods ------------------------------------------------------------
+
+extern "C"
+JNIEXPORT jint JNICALL Java_com_formdev_flatlaf_ui_FlatNativeLibrary_getApiVersion
+	( JNIEnv* env, jclass cls )
+{
+	return API_VERSION_LINUX;
+}

flatlaf-natives/flatlaf-natives-linux/src/main/headers/com_formdev_flatlaf_ui_FlatNativeLibrary.h

@@ -0,0 +1,21 @@
+/* DO NOT EDIT THIS FILE - it is machine generated */
+#include <jni.h>
+/* Header for class com_formdev_flatlaf_ui_FlatNativeLibrary */
+
+#ifndef _Included_com_formdev_flatlaf_ui_FlatNativeLibrary
+#define _Included_com_formdev_flatlaf_ui_FlatNativeLibrary
+#ifdef __cplusplus
+extern "C" {
+#endif
+/*
+ * Class:     com_formdev_flatlaf_ui_FlatNativeLibrary
+ * Method:    getApiVersion
+ * Signature: ()I
+ */
+JNIEXPORT jint JNICALL Java_com_formdev_flatlaf_ui_FlatNativeLibrary_getApiVersion
+  (JNIEnv *, jclass);
+
+#ifdef __cplusplus
+}
+#endif
+#endif

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

@@ -26,14 +26,17 @@ plugins {
 }
 
 flatlafJniHeaders {
-	headers = listOf( "com_formdev_flatlaf_ui_FlatNativeMacLibrary.h" )
+	headers = listOf(
+		"com_formdev_flatlaf_ui_FlatNativeLibrary.h",
+		"com_formdev_flatlaf_ui_FlatNativeMacLibrary.h"
+	)
 }
 
 library {
-	targetMachines.set( listOf(
+	targetMachines = listOf(
 		machines.macOS.architecture( "arm64" ),
 		machines.macOS.x86_64
-	) )
+	)
 }
 
 var javaHome = System.getProperty( "java.home" )

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

@@ -42,5 +42,5 @@
 
 
 jclass findClass( JNIEnv *env, const char* className, bool globalRef );
-jfieldID getFieldID( JNIEnv *env, const char* className, const char* fieldName, const char* fieldSignature, bool staticField );
+jfieldID getFieldID( JNIEnv *env, jclass cls, const char* fieldName, const char* fieldSignature, bool staticField );
 jmethodID getMethodID( JNIEnv *env, jclass cls, const char* methodName, const char* methodSignature, bool staticMethod );

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

@@ -0,0 +1,21 @@
+/* DO NOT EDIT THIS FILE - it is machine generated */
+#include <jni.h>
+/* Header for class com_formdev_flatlaf_ui_FlatNativeLibrary */
+
+#ifndef _Included_com_formdev_flatlaf_ui_FlatNativeLibrary
+#define _Included_com_formdev_flatlaf_ui_FlatNativeLibrary
+#ifdef __cplusplus
+extern "C" {
+#endif
+/*
+ * Class:     com_formdev_flatlaf_ui_FlatNativeLibrary
+ * Method:    getApiVersion
+ * Signature: ()I
+ */
+JNIEXPORT jint JNICALL Java_com_formdev_flatlaf_ui_FlatNativeLibrary_getApiVersion
+  (JNIEnv *, jclass);
+
+#ifdef __cplusplus
+}
+#endif
+#endif

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

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2024 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.
+ */
+
+#include <jni.h>
+#include "com_formdev_flatlaf_ui_FlatNativeLibrary.h"
+
+/**
+ * @author Karl Tauber
+ */
+
+
+// increase this version if changing API or functionality of native library
+// also update version in Java class com.formdev.flatlaf.ui.FlatNativeMacLibrary
+#define API_VERSION_MACOS		2001
+
+
+//---- JNI methods ------------------------------------------------------------
+
+extern "C"
+JNIEXPORT jint JNICALL Java_com_formdev_flatlaf_ui_FlatNativeLibrary_getApiVersion
+	( JNIEnv* env, jclass cls )
+{
+	return API_VERSION_MACOS;
+}

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

@@ -38,10 +38,9 @@ jclass findClass( JNIEnv *env, const char* className, bool globalRef ) {
 	return cls;
 }
 
-jfieldID getFieldID( JNIEnv *env, const char* className, const char* fieldName, const char* fieldSignature, bool staticField ) {
-//	NSLog( @"getFieldID %s %s %s", className, fieldName, fieldSignature );
+jfieldID getFieldID( JNIEnv *env, jclass cls, const char* fieldName, const char* fieldSignature, bool staticField ) {
+//	NSLog( @"getFieldID %s %s", fieldName, fieldSignature );
 
-	jclass cls = findClass( env, className, false );
 	if( cls == NULL )
 		return NULL;
 
@@ -49,7 +48,7 @@ jfieldID getFieldID( JNIEnv *env, const char* className, const char* fieldName,
 		? env->GetStaticFieldID( cls, fieldName, fieldSignature )
 		: env->GetFieldID( cls, fieldName, fieldSignature );
 	if( fieldID == NULL ) {
-		NSLog( @"FlatLaf: failed to lookup field '%s' of type '%s' in class '%s'", fieldName, fieldSignature, className );
+		NSLog( @"FlatLaf: failed to lookup field '%s' of type '%s'", fieldName, fieldSignature );
 		env->ExceptionDescribe(); // print stack trace
 		env->ExceptionClear();
 		return NULL;

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

@@ -52,21 +52,27 @@ NSWindow* getNSWindow( JNIEnv* env, jclass cls, jobject window ) {
 	if( window == NULL )
 		return NULL;
 
+	// initialize class IDs (done only once because variables are static)
+	static jclass lwWindowPeerClass = findClass( env, "sun/lwawt/LWWindowPeer", true );
+	static jclass cfRetainedResourceClass = findClass( env, "sun/lwawt/macosx/CFRetainedResource", true );
+	if( lwWindowPeerClass == NULL || cfRetainedResourceClass == NULL )
+		return NULL;
+
 	// initialize field IDs (done only once because variables are static)
-	static jfieldID peerID = getFieldID( env, "java/awt/Component", "peer", "Ljava/awt/peer/ComponentPeer;", false );
-	static jfieldID platformWindowID = getFieldID( env, "sun/lwawt/LWWindowPeer", "platformWindow", "Lsun/lwawt/PlatformWindow;", false );
-	static jfieldID ptrID = getFieldID( env, "sun/lwawt/macosx/CFRetainedResource", "ptr", "J", false );
+	static jfieldID peerID = getFieldID( env, findClass( env, "java/awt/Component", false ), "peer", "Ljava/awt/peer/ComponentPeer;", false );
+	static jfieldID platformWindowID = getFieldID( env, lwWindowPeerClass, "platformWindow", "Lsun/lwawt/PlatformWindow;", false );
+	static jfieldID ptrID = getFieldID( env, cfRetainedResourceClass, "ptr", "J", false );
 	if( peerID == NULL || platformWindowID == NULL || ptrID == NULL )
 		return NULL;
 
 	// get field java.awt.Component.peer
 	jobject peer = env->GetObjectField( window, peerID );
-	if( peer == NULL )
+	if( peer == NULL || !env->IsInstanceOf( peer, lwWindowPeerClass ) )
 		return NULL;
 
 	// get field sun.lwawt.LWWindowPeer.platformWindow
 	jobject platformWindow = env->GetObjectField( peer, platformWindowID );
-	if( platformWindow == NULL )
+	if( platformWindow == NULL || !env->IsInstanceOf( platformWindow, cfRetainedResourceClass ) )
 		return NULL;
 
 	// get field sun.lwawt.macosx.CFRetainedResource.ptr

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

@@ -22,6 +22,7 @@ plugins {
 
 flatlafJniHeaders {
 	headers = listOf(
+		"com_formdev_flatlaf_ui_FlatNativeLibrary.h",
 		"com_formdev_flatlaf_ui_FlatNativeWindowsLibrary.h",
 		"com_formdev_flatlaf_ui_FlatWindowsNativeWindowBorder.h",
 		"com_formdev_flatlaf_ui_FlatWindowsNativeWindowBorder_WndProc.h"
@@ -29,11 +30,11 @@ flatlafJniHeaders {
 }
 
 library {
-	targetMachines.set( listOf(
+	targetMachines = listOf(
 		machines.windows.x86,
 		machines.windows.x86_64,
 		machines.windows.architecture( "aarch64" )
-	) )
+	)
 }
 
 var javaHome = System.getProperty( "java.home" )

flatlaf-natives/flatlaf-natives-windows/src/main/cpp/ApiVersion.cpp

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2024 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.
+ */
+
+#include <jni.h>
+#include "com_formdev_flatlaf_ui_FlatNativeLibrary.h"
+
+/**
+ * @author Karl Tauber
+ */
+
+
+// increase this version if changing API or functionality of native library
+// also update version in Java class com.formdev.flatlaf.ui.FlatNativeWindowsLibrary
+#define API_VERSION_WINDOWS		1001
+
+
+//---- JNI methods ------------------------------------------------------------
+
+extern "C"
+JNIEXPORT jint JNICALL Java_com_formdev_flatlaf_ui_FlatNativeLibrary_getApiVersion
+	( JNIEnv* env, jclass cls )
+{
+	return API_VERSION_WINDOWS;
+}

flatlaf-natives/flatlaf-natives-windows/src/main/headers/com_formdev_flatlaf_ui_FlatNativeLibrary.h

@@ -0,0 +1,21 @@
+/* DO NOT EDIT THIS FILE - it is machine generated */
+#include <jni.h>
+/* Header for class com_formdev_flatlaf_ui_FlatNativeLibrary */
+
+#ifndef _Included_com_formdev_flatlaf_ui_FlatNativeLibrary
+#define _Included_com_formdev_flatlaf_ui_FlatNativeLibrary
+#ifdef __cplusplus
+extern "C" {
+#endif
+/*
+ * Class:     com_formdev_flatlaf_ui_FlatNativeLibrary
+ * Method:    getApiVersion
+ * Signature: ()I
+ */
+JNIEXPORT jint JNICALL Java_com_formdev_flatlaf_ui_FlatNativeLibrary_getApiVersion
+  (JNIEnv *, jclass);
+
+#ifdef __cplusplus
+}
+#endif
+#endif

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

@@ -24,6 +24,7 @@ import java.awt.event.MouseEvent;
 import java.awt.event.MouseListener;
 import java.awt.event.MouseWheelEvent;
 import java.awt.event.MouseWheelListener;
+import java.util.Random;
 import javax.swing.*;
 import javax.swing.border.*;
 import com.formdev.flatlaf.FlatLaf;
@@ -178,6 +179,20 @@ public class FlatContainerTest
 				tabbedPane.addTab( "Tab 4", new JLabel( "non-opaque content", SwingConstants.CENTER ) );
 				break;
 
+			case 4:
+				tabbedPane.addTab( "Tab 5", new JLabel( "random background content", SwingConstants.CENTER ) {
+					Random random = new Random();
+
+					@Override
+					protected void paintComponent( Graphics g ) {
+						g.setColor( new Color( random.nextInt() ) );
+						g.fillRect( 0, 0, getWidth(), getHeight() );
+
+						super.paintComponent( g );
+					}
+				} );
+				break;
+
 			default:
 				int index = tabbedPane.getTabCount() + 1;
 				tabbedPane.addTab( "Tab " + index, createTab( "tab content " + index ) );

flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/extras/FlatExtrasTest.java

@@ -16,6 +16,7 @@
 
 package com.formdev.flatlaf.testing.extras;
 
+import java.awt.*;
 import javax.swing.*;
 import com.formdev.flatlaf.extras.*;
 import com.formdev.flatlaf.extras.components.*;
@@ -75,6 +76,12 @@ public class FlatExtrasTest
 		disabledTabbedPane2.setIconAt( 0, icon );
 		disabledTabbedPane2.setDisabledIconAt( 0, disabledIcon );
 
+		addJSVGIcon( "linearGradient.svg", 64, 128 );
+		addJSVGIcon( "stripes.svg", 128, 128 );
+		addJSVGIcon( "gradientText0.svg", 128, 128 );
+		addJSVGIcon( "gradientText1.svg", 128, 128 );
+		addJSVGIcon( "gradientText2.svg", 128, 128 );
+
 		disabledChanged();
 	}
 
@@ -82,6 +89,10 @@ public class FlatExtrasTest
 		svgIconsPanel.add( new JLabel( new FlatSVGIcon( "com/formdev/flatlaf/demo/extras/svg/" + name ) ) );
 	}
 
+	private void addJSVGIcon( String name, int width, int height ) {
+		gradientIconsPanel.add( new JLabel( new FlatSVGIcon( "com/formdev/flatlaf/testing/extras/jsvg/" + name, width, height ) ) );
+	}
+
 	private void triStateCheckBox1Changed() {
 		triStateLabel1.setText( triStateCheckBox1.getState().toString() );
 	}
@@ -104,6 +115,9 @@ public class FlatExtrasTest
 		disabledLabel2.setEnabled( enabled );
 		disabledButton2.setEnabled( enabled );
 		disabledTabbedPane2.setEnabledAt( 0, enabled );
+
+		for( Component c : gradientIconsPanel.getComponents() )
+			c.setEnabled( enabled );
 	}
 
 	@Override
@@ -141,6 +155,7 @@ public class FlatExtrasTest
 		disabledButton2 = new JButton();
 		disabledTabbedPane2 = new JTabbedPane();
 		label6 = new JLabel();
+		gradientIconsPanel = new JPanel();
 
 		//======== this ========
 		setLayout(new MigLayout(
@@ -156,6 +171,7 @@ public class FlatExtrasTest
 			"[]" +
 			"[]" +
 			"[]" +
+			"[]" +
 			"[]"));
 
 		//---- label1 ----
@@ -251,6 +267,12 @@ public class FlatExtrasTest
 		label6.setText("setIcon() and setDisabledIcon()");
 		label6.setEnabled(false);
 		add(label6, "cell 1 6 2 1,gapx 20");
+
+		//======== gradientIconsPanel ========
+		{
+			gradientIconsPanel.setLayout(new FlowLayout());
+		}
+		add(gradientIconsPanel, "cell 1 7 2 1");
 		// JFormDesigner - End of component initialization  //GEN-END:initComponents
 	}
 
@@ -275,5 +297,6 @@ public class FlatExtrasTest
 	private JButton disabledButton2;
 	private JTabbedPane disabledTabbedPane2;
 	private JLabel label6;
+	private JPanel gradientIconsPanel;
 	// JFormDesigner - End of variables declaration  //GEN-END:variables
 }

flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/extras/FlatExtrasTest.jfd

@@ -1,4 +1,4 @@
-JFDML JFormDesigner: "7.0.3.1.342" Java: "15" encoding: "UTF-8"
+JFDML JFormDesigner: "8.2.0.0.331" Java: "21" encoding: "UTF-8"
 
 new FormModel {
 	contentType: "form/swing"
@@ -6,7 +6,7 @@ new FormModel {
 		add( new FormContainer( "com.formdev.flatlaf.testing.FlatTestPanel", new FormLayoutManager( class net.miginfocom.swing.MigLayout ) {
 			"$layoutConstraints": "ltr,insets dialog,hidemode 3"
 			"$columnConstraints": "[][][left]"
-			"$rowConstraints": "[][][][][][][]"
+			"$rowConstraints": "[][][][][][][][]"
 		} ) {
 			name: "this"
 			add( new FormComponent( "javax.swing.JLabel" ) {
@@ -143,9 +143,14 @@ new FormModel {
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 				"value": "cell 1 6 2 1,gapx 20"
 			} )
+			add( new FormContainer( "javax.swing.JPanel", new FormLayoutManager( class java.awt.FlowLayout ) ) {
+				name: "gradientIconsPanel"
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 1 7 2 1"
+			} )
 		}, new FormLayoutConstraints( null ) {
 			"location": new java.awt.Point( 0, 0 )
-			"size": new java.awt.Dimension( 595, 470 )
+			"size": new java.awt.Dimension( 645, 470 )
 		} )
 	}
 }

flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/jideoss/FlatJideOssContainerTest.java

@@ -17,6 +17,7 @@
 package com.formdev.flatlaf.testing.jideoss;
 
 import java.awt.*;
+import java.util.Random;
 import javax.swing.*;
 import javax.swing.border.*;
 import com.formdev.flatlaf.FlatClientProperties;
@@ -140,6 +141,20 @@ public class FlatJideOssContainerTest
 				tabbedPane.addTab( "Tab 4", new JLabel( "non-opaque content", SwingConstants.CENTER ) );
 				break;
 
+			case 4:
+				tabbedPane.addTab( "Tab 5", new JLabel( "random background content", SwingConstants.CENTER ) {
+					Random random = new Random();
+
+					@Override
+					protected void paintComponent( Graphics g ) {
+						g.setColor( new Color( random.nextInt() ) );
+						g.fillRect( 0, 0, getWidth(), getHeight() );
+
+						super.paintComponent( g );
+					}
+				} );
+				break;
+
 			default:
 				int index = tabbedPane.getTabCount() + 1;
 				tabbedPane.addTab( "Tab " + index, createTab( "tab content " + index ) );

flatlaf-testing/src/main/resources/com/formdev/flatlaf/testing/extras/jsvg/LICENSE.txt

@@ -0,0 +1,3 @@
+The SVG icons in this folder are from JSVG,
+which is licensed under the MIT License
+See: https://github.com/weisJ/jsvg

flatlaf-testing/src/main/resources/com/formdev/flatlaf/testing/extras/jsvg/gradientText0.svg

@@ -0,0 +1,12 @@
+<svg viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg"
+	stroke="none">
+	<defs>
+		<linearGradient id="myGradient"
+			gradientTransform="rotate(90)">
+			<stop offset="5%" stop-color="gold" />
+			<stop offset="95%" stop-color="red" />
+		</linearGradient>
+	</defs>
+	<rect x="0" y="50" width="100" height="40" fill="url(#myGradient)" />
+	<text x="0" y="50" fill="url(#myGradient)">Hello lovely World!</text>
+</svg>

flatlaf-testing/src/main/resources/com/formdev/flatlaf/testing/extras/jsvg/gradientText1.svg

@@ -0,0 +1,14 @@
+<svg viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg"
+	stroke="none">
+	<defs>
+		<linearGradient id="myGradient">
+			<stop offset="5%" stop-color="gold" />
+			<stop offset="95%" stop-color="red" />
+		</linearGradient>
+	</defs>
+	<text x="0" y="50">
+		Hello
+		<tspan fill="url(#myGradient)">lovely</tspan>
+		World!
+	</text>
+</svg>

flatlaf-testing/src/main/resources/com/formdev/flatlaf/testing/extras/jsvg/gradientText2.svg

@@ -0,0 +1,14 @@
+<svg viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg"
+	stroke="none">
+	<defs>
+		<linearGradient id="myGradient">
+			<stop offset="5%" stop-color="gold" />
+			<stop offset="95%" stop-color="red" />
+		</linearGradient>
+	</defs>
+	<text x="0" y="50" fill="url(#myGradient)">
+		Hello
+		<tspan>lovely</tspan>
+		World!
+	</text>
+</svg>

flatlaf-testing/src/main/resources/com/formdev/flatlaf/testing/extras/jsvg/linearGradient.svg

@@ -0,0 +1,23 @@
+<svg width="120" height="240" version="1.1"
+	xmlns="http://www.w3.org/2000/svg">
+	<defs>
+		<linearGradient id="Gradient1"
+			gradientUnits="objectBoundingBox">
+			<stop offset="0%" stop-color="red" />
+			<stop offset="50%" stop-color="black" stop-opacity="0" />
+			<stop offset="100%" stop-color="blue" />
+		</linearGradient>
+		<linearGradient id="Gradient2" x1="0" x2="0" y1="0"
+			y2="1">
+			<stop offset="0%" stop-color="red" />
+			<stop offset="50%" stop-color="black" stop-opacity="0" />
+			<stop offset="100%" stop-color="blue" />
+		</linearGradient>
+	</defs>
+
+	<rect id="rect1" x="10" y="10" rx="15" ry="15" width="100"
+		height="100" fill="url(#Gradient1)" />
+	<rect x="10" y="120" rx="15" ry="15" width="100" height="100"
+		fill="url(#Gradient2)" />
+
+</svg>

flatlaf-testing/src/main/resources/com/formdev/flatlaf/testing/extras/jsvg/stripes.svg

@@ -0,0 +1,27 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="500px" height="500px">
+	<defs>
+		<linearGradient id="stripes">
+			<stop offset="0%" stop-color="red" />
+			<stop offset="10%" stop-color="red" />
+			<stop offset="10%" stop-color="orange" />
+			<stop offset="20%" stop-color="orange" />
+			<stop offset="20%" stop-color="yellow" />
+			<stop offset="30%" stop-color="yellow" />
+			<stop offset="30%" stop-color="lightgreen" />
+			<stop offset="40%" stop-color="lightgreen" />
+			<stop offset="40%" stop-color="green" />
+			<stop offset="50%" stop-color="green" />
+			<stop offset="50%" stop-color="purple" />
+			<stop offset="60%" stop-color="purple" />
+			<stop offset="60%" stop-color="blue" />
+			<stop offset="70%" stop-color="blue" />
+			<stop offset="70%" stop-color="skyblue" />
+			<stop offset="80%" stop-color="skyblue" />
+			<stop offset="80%" stop-color="pink" />
+			<stop offset="90%" stop-color="pink" />
+			<stop offset="90%" stop-color="white" />
+			<stop offset="100%" stop-color="white" />
+		</linearGradient>
+	</defs>
+	<rect width="100%" height="100%" fill="url(#stripes)" />
+</svg>

gradle.properties

@@ -14,7 +14,7 @@
 # limitations under the License.
 #
 
-flatlaf.releaseVersion     = 3.4
+flatlaf.releaseVersion     = 3.4.1
 flatlaf.developmentVersion = 3.5-SNAPSHOT
 
 org.gradle.parallel = true

gradle/libs.versions.toml

@@ -15,7 +15,7 @@
 #
 
 [versions]
-junit = "5.10.0"
+junit = "5.10.2"
 
 
 [libraries]
@@ -24,10 +24,10 @@ junit = "5.10.0"
 sigtest = "org.netbeans.tools:sigtest-maven-plugin:1.7"
 
 # flatlaf-extras
-jsvg = "com.github.weisj:jsvg:1.2.0"
+jsvg = "com.github.weisj:jsvg:1.4.0"
 
 # flatlaf-jide-oss
-jide-oss = "com.formdev:jide-oss:3.7.14"
+jide-oss = "com.formdev:jide-oss:3.7.15"
 
 # flatlaf-swingx
 swingx-all = "org.swinglabs.swingx:swingx-all:1.6.5-1"
@@ -50,16 +50,12 @@ jna = "net.java.dev.jna:jna:5.12.1"
 jna-platform = "net.java.dev.jna:jna-platform:5.12.1"
 
 # junit
-junit-api = { module = "org.junit.jupiter:junit-jupiter-api", version.ref = "junit" }
-junit-params = { module = "org.junit.jupiter:junit-jupiter-params", version.ref = "junit" }
-junit-engine = { module = "org.junit.jupiter:junit-jupiter-engine", version.ref = "junit" }
+junit = { module = "org.junit.jupiter:junit-jupiter", version.ref = "junit" }
+junit-launcher = { module = "org.junit.platform:junit-platform-launcher" }
 
 # errorprone
 errorprone = "com.google.errorprone:error_prone_core:2.20.0"
 
 
-[bundles]
-junit = [ "junit-api", "junit-params" ]
-
 [plugins]
 errorprone = { id = "net.ltgt.errorprone", version = "3.1.0" }

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.4-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME

gradlew.bat

@@ -43,11 +43,11 @@ set JAVA_EXE=java.exe
 %JAVA_EXE% -version >NUL 2>&1
 if %ERRORLEVEL% equ 0 goto execute
 
-echo.
-echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
 
 goto fail
 
@@ -57,11 +57,11 @@ set JAVA_EXE=%JAVA_HOME%/bin/java.exe
 
 if exist "%JAVA_EXE%" goto execute
 
-echo.
-echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
 
 goto fail