Native window decorations: support 32-bit JREs

.gitattributes

@@ -19,6 +19,7 @@
 *.dylib binary
 *.gif binary
 *.jar binary
+*.lib binary
 *.png binary
 *.sketch binary
 *.so binary

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

@@ -144,7 +144,7 @@ public abstract class FlatLaf
 	 * <p>
 	 * Returns also {@code false} on Windows 10 if:
 	 * <ul>
-	 * <li>FlatLaf native window border support is available (requires Windows 10 64-bit)</li>
+	 * <li>FlatLaf native window border support is available (requires Windows 10)</li>
 	 * <li>running in
 	 * <a href="https://confluence.jetbrains.com/display/JBR/JetBrains+Runtime">JetBrains Runtime 11 (or later)</a>
 	 * (<a href="https://github.com/JetBrains/JetBrainsRuntime">source code on github</a>)

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

@@ -63,7 +63,7 @@ public interface FlatSystemProperties
 	 * <p>
 	 * Setting this to {@code false} disables using FlatLaf native window decorations.
 	 * <p>
-	 * (requires Window 10 64-bit)
+	 * (requires Window 10)
 	 * <p>
 	 * <strong>Allowed Values</strong> {@code false} and {@code true}<br>
 	 * <strong>Default</strong> none

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

@@ -221,8 +221,8 @@ public class FlatNativeWindowBorder
 			return;
 		supported = false;
 
-		// requires Windows 10 on x86_64
-		if( !SystemInfo.isWindows_10_orLater || !SystemInfo.isX86_64 )
+		// requires Windows 10
+		if( !SystemInfo.isWindows_10_orLater )
 			return;
 
 		// check whether disabled via system property

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

@@ -79,8 +79,8 @@ class FlatWindowsNativeWindowBorder
 	private static FlatWindowsNativeWindowBorder instance;
 
 	static FlatNativeWindowBorder.Provider getInstance() {
-		// requires Windows 10 on x86_64
-		if( !SystemInfo.isWindows_10_orLater || !SystemInfo.isX86_64 )
+		// requires Windows 10
+		if( !SystemInfo.isWindows_10_orLater )
 			return null;
 
 		// load native library
@@ -98,8 +98,11 @@ class FlatWindowsNativeWindowBorder
 				}
 			}
 
-			nativeLibrary = new NativeLibrary(
-				"com/formdev/flatlaf/natives/flatlaf-windows-x86_64",
+			String libraryName = "com/formdev/flatlaf/natives/flatlaf-windows-x86";
+			if( SystemInfo.isX86_64 )
+				libraryName += "_64";
+
+			nativeLibrary = new NativeLibrary( libraryName,
 				FlatWindowsNativeWindowBorder.class.getClassLoader(), true );
 		}
 
@@ -135,8 +138,8 @@ class FlatWindowsNativeWindowBorder
 	}
 
 	private void install( Window window ) {
-		// requires Windows 10 on x86_64
-		if( !SystemInfo.isWindows_10_orLater || !SystemInfo.isX86_64 )
+		// requires Windows 10
+		if( !SystemInfo.isWindows_10_orLater )
 			return;
 
 		// only JFrame and JDialog are supported

flatlaf-natives/flatlaf-natives-jna/src/main/java/com/formdev/flatlaf/natives/jna/windows/FlatWindowsNativeWindowBorder.java

@@ -127,8 +127,8 @@ public class FlatWindowsNativeWindowBorder
 	}
 
 	private void install( Window window ) {
-		// requires Windows 10 on x86_64
-		if( !SystemInfo.isWindows_10_orLater || !SystemInfo.isX86_64 )
+		// requires Windows 10
+		if( !SystemInfo.isWindows_10_orLater )
 			return;
 
 		// only JFrame and JDialog are supported
@@ -321,7 +321,10 @@ public class FlatWindowsNativeWindowBorder
 			hwnd = new HWND( Native.getComponentPointer( window ) );
 
 			// replace window procedure
+			if( SystemInfo.isX86_64 )
 				defaultWndProc = User32Ex.INSTANCE.SetWindowLongPtr( hwnd, GWLP_WNDPROC, this );
+			else
+				defaultWndProc = User32Ex.INSTANCE.SetWindowLong( hwnd, GWLP_WNDPROC, this );
 
 			// remove the OS window title bar
 			updateFrame();
@@ -329,7 +332,10 @@ public class FlatWindowsNativeWindowBorder
 
 		void uninstall() {
 			// restore original window procedure
+			if( SystemInfo.isX86_64 )
 				User32Ex.INSTANCE.SetWindowLongPtr( hwnd, GWLP_WNDPROC, defaultWndProc );
+			else
+				User32Ex.INSTANCE.SetWindowLong( hwnd, GWLP_WNDPROC, defaultWndProc );
 
 			// show the OS window title bar
 			updateFrame();
@@ -382,7 +388,10 @@ public class FlatWindowsNativeWindowBorder
 			LRESULT lResult = User32Ex.INSTANCE.CallWindowProc( defaultWndProc, hwnd, uMsg, wParam, lParam );
 
 			// restore original window procedure
+			if( SystemInfo.isX86_64 )
 				User32Ex.INSTANCE.SetWindowLongPtr( hwnd, GWLP_WNDPROC, defaultWndProc );
+			else
+				User32Ex.INSTANCE.SetWindowLong( hwnd, GWLP_WNDPROC, defaultWndProc );
 
 			// cleanup
 			windowsMap.remove( window );
@@ -640,6 +649,8 @@ public class FlatWindowsNativeWindowBorder
 
 		LONG_PTR SetWindowLongPtr( HWND hWnd, int nIndex, WindowProc wndProc );
 		LONG_PTR SetWindowLongPtr( HWND hWnd, int nIndex, LONG_PTR wndProc );
+		LONG_PTR SetWindowLong( HWND hWnd, int nIndex, WindowProc wndProc );
+		LONG_PTR SetWindowLong( HWND hWnd, int nIndex, LONG_PTR wndProc );
 		LRESULT CallWindowProc( LONG_PTR lpPrevWndFunc, HWND hWnd, int uMsg, WPARAM wParam, LPARAM lParam );
 
 		int GetDpiForWindow( HWND hwnd );

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

@@ -9,9 +9,9 @@ Tested only with Microsoft Visual C++ 2019 (comes with Visual Studio 2019).
 
 To be able to build FlatLaf on any platform, and without C++ compiler, the
 pre-built DLL is checked into Git at
-`flatlaf-core/src/main/resources/com/formdev/flatlaf/natives/flatlaf-windows-x86_64.dll`.
+[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).
 
-This DLL was built on a GitHub server with the help of GitHub Actions. See:
+The DLL was built on a GitHub server with the help of GitHub Actions. See:
 [Native Libraries](https://github.com/JFormDesigner/FlatLaf/actions/workflows/natives.yml)
 workflow. Then the produced Artifacts ZIP was downloaded and the DLL checked
 into Git.

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

@@ -20,18 +20,16 @@ plugins {
 }
 
 library {
-	targetMachines.set( listOf( machines.windows.x86_64 ) )
+	targetMachines.set( listOf( machines.windows.x86, machines.windows.x86_64 ) )
 
 	variants.configureEach {
-		// depend on :flatlaf-core:compileJava because this task generates the JNI headers
-		tasks.named( "compileCpp" ) {
-			dependsOn( ":flatlaf-core:compileJava" )
-		}
-
 		sharedLibrary {
 			compileTasks.configureEach {
 				onlyIf { isBuildable }
 
+				// depend on :flatlaf-core:compileJava because it generates the JNI headers
+				dependsOn( ":flatlaf-core:compileJava" )
+
 				doFirst {
 					println( "Used Tool Chain:" )
 					println( "  - ${toolChain.get()}" )
@@ -67,11 +65,12 @@ library {
 				onlyIf { isBuildable }
 
 				val nativesDir = project( ":flatlaf-core" ).projectDir.resolve( "src/main/resources/com/formdev/flatlaf/natives" )
-				val libraryName = "flatlaf-windows-x86_64.dll"
+				val is64Bit = targetMachine.architecture.is64Bit
+				val libraryName = if( is64Bit ) "flatlaf-windows-x86_64.dll" else "flatlaf-windows-x86.dll"
+				val jawt = if( is64Bit ) "lib/jawt-x86_64" else "lib/jawt-x86"
 
 				outputs.file( "$nativesDir/$libraryName" )
 
-				val jawt = "${org.gradle.internal.jvm.Jvm.current().javaHome}/lib/jawt"
 				linkerArgs.addAll( toolChain.map {
 					when( it ) {
 						is Gcc, is Clang -> listOf( "-l${jawt}", "-lUser32", "-lshell32", "-lAdvAPI32", "-lKernel32" )
@@ -90,9 +89,11 @@ library {
 				}
 			}
 
-			tasks.named( "jar" ) {
+			for( taskName in listOf( "jarX86", "jarX86-64" ) ) {
+				tasks.named( taskName ) {
 					onlyIf { false }
 				}
 			}
 		}
+	}
 }

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

@@ -0,0 +1,6 @@
+Contains libraries used to compile FlatLaf Windows 10 native libraries (DLLs).
+
+- `jawt-x86.lib` is `<jdk>/lib/jawt.lib` from AdoptOpenJDK jdk8u282-b08 32-bit,
+  which is required to build 32-bit DLL
+- `jawt-x86_64.lib` is `<jdk>/lib/jawt.lib` from AdoptOpenJDK jdk8u282-b08
+  64-bit, which is required to build 64-bit DLL