Native window decorations: show (system) tooltips for minimize/maximize/close buttons on Windows 10 and for minimize/close buttons on Windows 11 (issues #397 and #407)

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

@@ -235,7 +235,8 @@ public class FlatNativeWindowBorder
 	}
 
 	static void setTitleBarHeightAndHitTestSpots( Window window, int titleBarHeight,
-		List<Rectangle> hitTestSpots, Rectangle appIconBounds, Rectangle maximizeButtonBounds )
+		List<Rectangle> hitTestSpots, Rectangle appIconBounds, Rectangle minimizeButtonBounds,
+		Rectangle maximizeButtonBounds, Rectangle closeButtonBounds )
 	{
 		if( canUseJBRCustomDecorations ) {
 			JBRCustomDecorations.setTitleBarHeightAndHitTestSpots( window, titleBarHeight, hitTestSpots );
@@ -245,7 +246,8 @@ public class FlatNativeWindowBorder
 		if( !isSupported() )
 			return;
 
-		nativeProvider.updateTitleBarInfo( window, titleBarHeight, hitTestSpots, appIconBounds, maximizeButtonBounds );
+		nativeProvider.updateTitleBarInfo( window, titleBarHeight, hitTestSpots,
+			appIconBounds, minimizeButtonBounds, maximizeButtonBounds, closeButtonBounds );
 	}
 
 	static boolean showWindow( Window window, int cmd ) {
@@ -266,7 +268,7 @@ public class FlatNativeWindowBorder
 		try {
 /*
 			Class<?> cls = Class.forName( "com.formdev.flatlaf.natives.jna.windows.FlatWindowsNativeWindowBorder" );
-			Method m = cls.getMethod( "getInstance" );
+			java.lang.reflect.Method m = cls.getMethod( "getInstance" );
 			setNativeProvider( (Provider) m.invoke( null ) );
 */
 			setNativeProvider( FlatWindowsNativeWindowBorder.getInstance() );
@@ -291,7 +293,8 @@ public class FlatNativeWindowBorder
 		boolean hasCustomDecoration( Window window );
 		void setHasCustomDecoration( Window window, boolean hasCustomDecoration );
 		void updateTitleBarInfo( Window window, int titleBarHeight, List<Rectangle> hitTestSpots,
-			Rectangle appIconBounds, Rectangle maximizeButtonBounds );
+			Rectangle appIconBounds, Rectangle minimizeButtonBounds, Rectangle maximizeButtonBounds,
+			Rectangle closeButtonBounds );
 
 		// commands for showWindow(); values must match Win32 API
 		// https://docs.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-showwindow

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

@@ -521,24 +521,24 @@ public class FlatTitlePane
 			g.drawLine( 0, debugTitleBarHeight, getWidth(), debugTitleBarHeight );
 		}
 		if( debugHitTestSpots != null ) {
-			g.setColor( Color.red );
-			Point offset = SwingUtilities.convertPoint( this, 0, 0, window );
 			for( Rectangle r : debugHitTestSpots )
-				g.drawRect( r.x - offset.x, r.y - offset.y, r.width - 1, r.height - 1 );
+				paintRect( g, Color.red, r );
 		}
-		if( debugAppIconBounds != null ) {
+		paintRect( g, Color.cyan, debugCloseButtonBounds );
-			g.setColor( Color.blue );
+		paintRect( g, Color.blue, debugAppIconBounds );
+		paintRect( g, Color.magenta, debugMinimizeButtonBounds );
+		paintRect( g, Color.blue, debugMaximizeButtonBounds );
+		paintRect( g, Color.cyan, debugCloseButtonBounds );
+	}
+
+	private void paintRect( Graphics g, Color color, Rectangle r ) {
+		if( r == null )
+			return;
+
+		g.setColor( color );
 		Point offset = SwingUtilities.convertPoint( this, 0, 0, window );
-			Rectangle r = debugAppIconBounds;
 		g.drawRect( r.x - offset.x, r.y - offset.y, r.width - 1, r.height - 1 );
 	}
-		if( debugMaximizeButtonBounds != null ) {
-			g.setColor( Color.blue );
-			Point offset = SwingUtilities.convertPoint( this, 0, 0, window );
-			Rectangle r = debugMaximizeButtonBounds;
-			g.drawRect( r.x - offset.x, r.y - offset.y, r.width - 1, r.height - 1 );
-		}
-	}
 debug*/
 
 	@Override
@@ -760,13 +760,6 @@ debug*/
 				appIconBounds = iconBounds;
 		}
 
-		JButton maxButton = maximizeButton.isVisible()
-			? maximizeButton
-			: (restoreButton.isVisible() ? restoreButton : null);
-		Rectangle maximizeButtonBounds = (maxButton != null)
-			? SwingUtilities.convertRectangle( maxButton.getParent(), maxButton.getBounds(), window )
-			: null;
-
 		Rectangle r = getNativeHitTestSpot( buttonPanel );
 		if( r != null )
 			hitTestSpots.add( r );
@@ -801,18 +794,30 @@ debug*/
 			}
 		}
 
+		Rectangle minimizeButtonBounds = boundsInWindow( iconifyButton );
+		Rectangle maximizeButtonBounds = boundsInWindow( maximizeButton.isVisible() ? maximizeButton : restoreButton );
+		Rectangle closeButtonBounds = boundsInWindow( closeButton );
+
 		FlatNativeWindowBorder.setTitleBarHeightAndHitTestSpots( window, titleBarHeight,
-			hitTestSpots, appIconBounds, maximizeButtonBounds );
+			hitTestSpots, appIconBounds, minimizeButtonBounds, maximizeButtonBounds, closeButtonBounds );
 
 /*debug
 		debugTitleBarHeight = titleBarHeight;
 		debugHitTestSpots = hitTestSpots;
 		debugAppIconBounds = appIconBounds;
+		debugMinimizeButtonBounds = minimizeButtonBounds;
 		debugMaximizeButtonBounds = maximizeButtonBounds;
+		debugCloseButtonBounds = closeButtonBounds;
 		repaint();
 debug*/
 	}
 
+	private Rectangle boundsInWindow( JComponent c ) {
+		return c.isVisible()
+			? SwingUtilities.convertRectangle( c.getParent(), c.getBounds(), window )
+			: null;
+	}
+
 	protected Rectangle getNativeHitTestSpot( JComponent c ) {
 		Dimension size = c.getSize();
 		if( size.width <= 0 || size.height <= 0 )
@@ -831,7 +836,9 @@ debug*/
 	private int debugTitleBarHeight;
 	private List<Rectangle> debugHitTestSpots;
 	private Rectangle debugAppIconBounds;
+	private Rectangle debugMinimizeButtonBounds;
 	private Rectangle debugMaximizeButtonBounds;
+	private Rectangle debugCloseButtonBounds;
 debug*/
 
 	//---- class FlatTitlePaneBorder ------------------------------------------

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

@@ -182,7 +182,8 @@ class FlatWindowsNativeWindowBorder
 
 	@Override
 	public void updateTitleBarInfo( Window window, int titleBarHeight, List<Rectangle> hitTestSpots,
-		Rectangle appIconBounds, Rectangle maximizeButtonBounds )
+		Rectangle appIconBounds, Rectangle minimizeButtonBounds, Rectangle maximizeButtonBounds,
+		Rectangle closeButtonBounds )
 	{
 		WndProc wndProc = windowsMap.get( window );
 		if( wndProc == null )
@@ -190,8 +191,14 @@ class FlatWindowsNativeWindowBorder
 
 		wndProc.titleBarHeight = titleBarHeight;
 		wndProc.hitTestSpots = hitTestSpots.toArray( new Rectangle[hitTestSpots.size()] );
-		wndProc.appIconBounds = (appIconBounds != null) ? new Rectangle( appIconBounds ) : null;
+		wndProc.appIconBounds = cloneRectange( appIconBounds );
-		wndProc.maximizeButtonBounds = (maximizeButtonBounds != null) ? new Rectangle( maximizeButtonBounds ) : null;
+		wndProc.minimizeButtonBounds = cloneRectange( minimizeButtonBounds );
+		wndProc.maximizeButtonBounds = cloneRectange( maximizeButtonBounds );
+		wndProc.closeButtonBounds = cloneRectange( closeButtonBounds );
+	}
+
+	private static Rectangle cloneRectange( Rectangle rect ) {
+		return (rect != null) ? new Rectangle( rect ) : null;
 	}
 
 	@Override
@@ -294,8 +301,10 @@ class FlatWindowsNativeWindowBorder
 			HTCLIENT = 1,
 			HTCAPTION = 2,
 			HTSYSMENU = 3,
+			HTMINBUTTON = 8,
 			HTMAXBUTTON = 9,
-			HTTOP = 12;
+			HTTOP = 12,
+			HTCLOSE = 20;
 
 		private Window window;
 		private final long hwnd;
@@ -304,7 +313,9 @@ class FlatWindowsNativeWindowBorder
 		private int titleBarHeight;
 		private Rectangle[] hitTestSpots;
 		private Rectangle appIconBounds;
+		private Rectangle minimizeButtonBounds;
 		private Rectangle maximizeButtonBounds;
+		private Rectangle closeButtonBounds;
 
 		WndProc( Window window ) {
 			this.window = window;
@@ -357,15 +368,26 @@ class FlatWindowsNativeWindowBorder
 			// return HTSYSMENU if mouse is over application icon
 			//   - left-click on HTSYSMENU area shows system menu
 			//   - double-left-click sends WM_CLOSE
-			if( appIconBounds != null && appIconBounds.contains( sx, sy ) )
+			if( contains( appIconBounds, sx, sy ) )
 				return HTSYSMENU;
 
+			// return HTMINBUTTON if mouse is over minimize button
+			//   - hovering mouse over HTMINBUTTON area shows tooltip on Windows 10/11
+			if( contains( minimizeButtonBounds, sx, sy ) )
+				return HTMINBUTTON;
+
 			// return HTMAXBUTTON if mouse is over maximize/restore button
+			//   - hovering mouse over HTMAXBUTTON area shows tooltip on Windows 10
 			//   - hovering mouse over HTMAXBUTTON area shows snap layouts menu on Windows 11
 			//     https://docs.microsoft.com/en-us/windows/apps/desktop/modernize/apply-snap-layout-menu
-			if( maximizeButtonBounds != null && maximizeButtonBounds.contains( sx, sy ) )
+			if( contains( maximizeButtonBounds, sx, sy ) )
 				return HTMAXBUTTON;
 
+			// return HTCLOSE if mouse is over close button
+			//   - hovering mouse over HTCLOSE area shows tooltip on Windows 10/11
+			if( contains( closeButtonBounds, sx, sy ) )
+				return HTCLOSE;
+
 			boolean isOnTitleBar = (sy < titleBarHeight);
 
 			if( isOnTitleBar ) {
@@ -382,6 +404,10 @@ class FlatWindowsNativeWindowBorder
 			return isOnResizeBorder ? HTTOP : HTCLIENT;
 		}
 
+		private boolean contains( Rectangle rect, int x, int y ) {
+			return (rect != null && rect.contains( x, y ) );
+		}
+
 		/**
 		 * Scales down in the same way as AWT.
 		 * See AwtWin32GraphicsDevice::ScaleDownX() and ::ScaleDownY()

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

@@ -165,7 +165,8 @@ public class FlatWindowsNativeWindowBorder
 
 	@Override
 	public void updateTitleBarInfo( Window window, int titleBarHeight, List<Rectangle> hitTestSpots,
-		Rectangle appIconBounds, Rectangle maximizeButtonBounds )
+		Rectangle appIconBounds, Rectangle minimizeButtonBounds, Rectangle maximizeButtonBounds,
+		Rectangle closeButtonBounds )
 	{
 		WndProc wndProc = windowsMap.get( window );
 		if( wndProc == null )
@@ -173,8 +174,14 @@ public class FlatWindowsNativeWindowBorder
 
 		wndProc.titleBarHeight = titleBarHeight;
 		wndProc.hitTestSpots = hitTestSpots.toArray( new Rectangle[hitTestSpots.size()] );
-		wndProc.appIconBounds = (appIconBounds != null) ? new Rectangle( appIconBounds ) : null;
+		wndProc.appIconBounds = cloneRectange( appIconBounds );
-		wndProc.maximizeButtonBounds = (maximizeButtonBounds != null) ? new Rectangle( maximizeButtonBounds ) : null;
+		wndProc.minimizeButtonBounds = cloneRectange( minimizeButtonBounds );
+		wndProc.maximizeButtonBounds = cloneRectange( maximizeButtonBounds );
+		wndProc.closeButtonBounds = cloneRectange( closeButtonBounds );
+	}
+
+	private static Rectangle cloneRectange( Rectangle rect ) {
+		return (rect != null) ? new Rectangle( rect ) : null;
 	}
 
 	@Override
@@ -306,8 +313,10 @@ public class FlatWindowsNativeWindowBorder
 			HTCLIENT = 1,
 			HTCAPTION = 2,
 			HTSYSMENU = 3,
+			HTMINBUTTON = 8,
 			HTMAXBUTTON = 9,
-			HTTOP = 12;
+			HTTOP = 12,
+			HTCLOSE = 20;
 
 		private static final int ABS_AUTOHIDE = 0x0000001;
 		private static final int ABM_GETAUTOHIDEBAREX = 0x0000000b;
@@ -337,7 +346,9 @@ public class FlatWindowsNativeWindowBorder
 		private int titleBarHeight;
 		private Rectangle[] hitTestSpots;
 		private Rectangle appIconBounds;
+		private Rectangle minimizeButtonBounds;
 		private Rectangle maximizeButtonBounds;
+		private Rectangle closeButtonBounds;
 
 		WndProc( Window window ) {
 			this.window = window;
@@ -423,6 +434,7 @@ public class FlatWindowsNativeWindowBorder
 		 */
 		@Override
 		public LRESULT callback( HWND hwnd, int uMsg, WPARAM wParam, LPARAM lParam ) {
+			long wparam = wParam.longValue();
 			switch( uMsg ) {
 				case WM_NCCALCSIZE:
 					return WmNcCalcSize( hwnd, uMsg, wParam, lParam );
@@ -434,16 +446,17 @@ public class FlatWindowsNativeWindowBorder
 					// if mouse is moved over some non-client areas,
 					// send it also to the client area to allow Swing to process it
 					// (required for Windows 11 maximize button)
-					if( wParam.longValue() == HTMAXBUTTON || wParam.longValue() == HTCAPTION || wParam.longValue() == HTSYSMENU )
+					if( wparam == HTMINBUTTON || wparam == HTMAXBUTTON || wparam == HTCLOSE ||
+						wparam == HTCAPTION || wparam == HTSYSMENU )
 					  sendMessageToClientArea( hwnd, WM_MOUSEMOVE, lParam );
 					break;
 
 				case WM_NCLBUTTONDOWN:
 				case WM_NCLBUTTONUP:
-					// if left mouse was pressed/released over maximize button,
+					// if left mouse was pressed/released over minimize/maximize/close button,
 					// send it also to the client area to allow Swing to process it
 					// (required for Windows 11 maximize button)
-					if( wParam.shortValue() == HTMAXBUTTON ) {
+					if( wparam == HTMINBUTTON || wparam == HTMAXBUTTON || wparam == HTCLOSE ) {
 						int uClientMsg = (uMsg == WM_NCLBUTTONDOWN) ? WM_LBUTTONDOWN : WM_LBUTTONUP;
 						sendMessageToClientArea( hwnd, uClientMsg, lParam );
 						return new LRESULT( 0 );
@@ -451,7 +464,7 @@ public class FlatWindowsNativeWindowBorder
 					break;
 
 				case WM_NCRBUTTONUP:
-					if( wParam.longValue() == HTCAPTION || wParam.longValue() == HTSYSMENU )
+					if( wparam == HTCAPTION || wparam == HTSYSMENU )
 						openSystemMenu( hwnd, GET_X_LPARAM( lParam ), GET_Y_LPARAM( lParam ) );
 					break;
 
@@ -610,15 +623,26 @@ public class FlatWindowsNativeWindowBorder
 			// return HTSYSMENU if mouse is over application icon
 			//   - left-click on HTSYSMENU area shows system menu
 			//   - double-left-click sends WM_CLOSE
-			if( appIconBounds != null && appIconBounds.contains( sx, sy ) )
+			if( contains( appIconBounds, sx, sy ) )
 				return new LRESULT( HTSYSMENU );
 
+			// return HTMINBUTTON if mouse is over minimize button
+			//   - hovering mouse over HTMINBUTTON area shows tooltip on Windows 10/11
+			if( contains( minimizeButtonBounds, sx, sy ) )
+				return new LRESULT( HTMINBUTTON );
+
 			// return HTMAXBUTTON if mouse is over maximize/restore button
+			//   - hovering mouse over HTMAXBUTTON area shows tooltip on Windows 10
 			//   - hovering mouse over HTMAXBUTTON area shows snap layouts menu on Windows 11
 			//     https://docs.microsoft.com/en-us/windows/apps/desktop/modernize/apply-snap-layout-menu
-			if( maximizeButtonBounds != null && maximizeButtonBounds.contains( sx, sy ) )
+			if( contains( maximizeButtonBounds, sx, sy ) )
 				return new LRESULT( HTMAXBUTTON );
 
+			// return HTCLOSE if mouse is over close button
+			//   - hovering mouse over HTCLOSE area shows tooltip on Windows 10/11
+			if( contains( closeButtonBounds, sx, sy ) )
+				return new LRESULT( HTCLOSE );
+
 			int resizeBorderHeight = getResizeHandleHeight();
 			boolean isOnResizeBorder = (y < resizeBorderHeight) &&
 				(User32.INSTANCE.GetWindowLong( hwnd, GWL_STYLE ) & WS_THICKFRAME) != 0;
@@ -638,6 +662,10 @@ public class FlatWindowsNativeWindowBorder
 			return new LRESULT( isOnResizeBorder ? HTTOP : HTCLIENT );
 		}
 
+		private boolean contains( Rectangle rect, int x, int y ) {
+			return (rect != null && rect.contains( x, y ) );
+		}
+
 		/**
 		 * Converts screen coordinates to window coordinates.
 		 */

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

@@ -219,16 +219,17 @@ LRESULT CALLBACK FlatWndProc::WindowProc( HWND hwnd, UINT uMsg, WPARAM wParam, L
 			// if mouse is moved over some non-client areas,
 			// send it also to the client area to allow Swing to process it
 			// (required for Windows 11 maximize button)
-			if( wParam == HTMAXBUTTON || wParam == HTCAPTION || wParam == HTSYSMENU )
+			if( wParam == HTMINBUTTON || wParam == HTMAXBUTTON || wParam == HTCLOSE ||
+				wParam == HTCAPTION || wParam == HTSYSMENU )
 			  sendMessageToClientArea( hwnd, WM_MOUSEMOVE, lParam );
 			break;
 
 		case WM_NCLBUTTONDOWN:
 		case WM_NCLBUTTONUP:
-			// if left mouse was pressed/released over maximize button,
+			// if left mouse was pressed/released over minimize/maximize/close button,
 			// send it also to the client area to allow Swing to process it
 			// (required for Windows 11 maximize button)
-			if( wParam == HTMAXBUTTON ) {
+			if( wParam == HTMINBUTTON || wParam == HTMAXBUTTON || wParam == HTCLOSE ) {
 				int uClientMsg = (uMsg == WM_NCLBUTTONDOWN) ? WM_LBUTTONDOWN : WM_LBUTTONUP;
 				sendMessageToClientArea( hwnd, uClientMsg, lParam );
 				return 0;

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

@@ -13,10 +13,14 @@ extern "C" {
 #define com_formdev_flatlaf_ui_FlatWindowsNativeWindowBorder_WndProc_HTCAPTION 2L
 #undef com_formdev_flatlaf_ui_FlatWindowsNativeWindowBorder_WndProc_HTSYSMENU
 #define com_formdev_flatlaf_ui_FlatWindowsNativeWindowBorder_WndProc_HTSYSMENU 3L
+#undef com_formdev_flatlaf_ui_FlatWindowsNativeWindowBorder_WndProc_HTMINBUTTON
+#define com_formdev_flatlaf_ui_FlatWindowsNativeWindowBorder_WndProc_HTMINBUTTON 8L
 #undef com_formdev_flatlaf_ui_FlatWindowsNativeWindowBorder_WndProc_HTMAXBUTTON
 #define com_formdev_flatlaf_ui_FlatWindowsNativeWindowBorder_WndProc_HTMAXBUTTON 9L
 #undef com_formdev_flatlaf_ui_FlatWindowsNativeWindowBorder_WndProc_HTTOP
 #define com_formdev_flatlaf_ui_FlatWindowsNativeWindowBorder_WndProc_HTTOP 12L
+#undef com_formdev_flatlaf_ui_FlatWindowsNativeWindowBorder_WndProc_HTCLOSE
+#define com_formdev_flatlaf_ui_FlatWindowsNativeWindowBorder_WndProc_HTCLOSE 20L
 /*
  * Class:     com_formdev_flatlaf_ui_FlatWindowsNativeWindowBorder_WndProc
  * Method:    installImpl