FlatLaf window decorations: strech iconify/maximize/close buttons to always fill whole title bar height (issue #897)

CHANGELOG.md

@@ -11,10 +11,13 @@ FlatLaf Change Log
   `sun.java2d.d3d` and `sun.java2d.noddraw` are not yet set), which disables
   usage of Windows Direct3D (DirectX) onscreen surfaces. Component rendering
   still uses Direct3D. (issue #887)
-- FlatLaf window decorations on Windows: Fixed possible application freeze when
-  using custom component that overrides `Component.contains(int x, int y)` and
-  invokes `SwingUtilities.convertPoint()` (or similar) from the overridden
-  method. (issue #878)
+- FlatLaf window decorations:
+  - Iconify/maximize/close buttons did not fill whole title bar height, if some
+    custom component in menu bar increases title bar height. (issue #897)
+  - Windows: Fixed possible application freeze when using custom component that
+    overrides `Component.contains(int x, int y)` and invokes
+    `SwingUtilities.convertPoint()` (or similar) from the overridden method.
+    (issue #878)
 - TextComponents: Fixed too fast scrolling in multi-line text components when
   using touchpads (e.g. on macOS). (issue #892)
 - ToolBar: Fixed endless loop if button in Toolbar has focus and is made

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

@@ -57,6 +57,8 @@ public abstract class FlatAbstractIcon
 //			g2.setColor( Color.blue );
 //			g2.drawRect( x, y, getIconWidth() - 1, getIconHeight() - 1 );
 
+			paintBackground( c, g2, x, y );
+
 			g2.translate( x, y );
 			UIScale.scaleGraphics( g2 );
 
@@ -69,7 +71,11 @@ public abstract class FlatAbstractIcon
 		}
 	}
 
-	protected abstract void paintIcon( Component c, Graphics2D g2 );
+	/** @since 3.5.2 */
+	protected void paintBackground( Component c, Graphics2D g, int x, int y ) {
+	}
+
+	protected abstract void paintIcon( Component c, Graphics2D g );
 
 	@Override
 	public int getIconWidth() {

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

@@ -60,23 +60,24 @@ public abstract class FlatWindowAbstractIcon
 
 	@Override
 	protected void paintIcon( Component c, Graphics2D g ) {
-		paintBackground( c, g );
-
 		g.setColor( getForeground( c ) );
 		HiDPIUtils.paintAtScale1x( g, 0, 0, width, height, this::paintIconAt1x );
 	}
 
 	protected abstract void paintIconAt1x( Graphics2D g, int x, int y, int width, int height, double scaleFactor );
 
-	protected void paintBackground( Component c, Graphics2D g ) {
+	/** @since 3.5.2 */
+	@Override
+	protected void paintBackground( Component c, Graphics2D g, int x, int y ) {
 		Color background = FlatButtonUI.buttonStateColor( c, null, null, null, hoverBackground, pressedBackground );
 		if( background != null ) {
 			// disable antialiasing for background rectangle painting to avoid blurry edges when scaled (e.g. at 125% or 175%)
 			Object oldHint = g.getRenderingHint( RenderingHints.KEY_ANTIALIASING );
 			g.setRenderingHint( RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_OFF );
 
+			// fill background of whole component
 			g.setColor( FlatUIUtils.deriveColor( background, c.getBackground() ) );
-			g.fillRect( 0, 0, width, height );
+			g.fillRect( 0, 0, c.getWidth(), c.getHeight() );
 
 			g.setRenderingHint( RenderingHints.KEY_ANTIALIASING, oldHint );
 		}

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

@@ -395,6 +395,12 @@ public class FlatTitlePane
 				// allow the button to shrink if space is rare
 				return new Dimension( UIScale.scale( buttonMinimumWidth ), super.getMinimumSize().height );
 			}
+			@Override
+			public Dimension getMaximumSize() {
+				// allow the button to fill whole button area height
+				// see also BasicMenuUI.getMaximumSize()
+				return new Dimension( super.getMaximumSize().width, Short.MAX_VALUE );
+			}
 		};
 		button.setFocusable( false );
 		button.setContentAreaFilled( false );

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

@@ -189,6 +189,7 @@ public class FlatWindowDecorationsTest
 
 		if( rightCompCheckBox.isSelected() ) {
 			rightStretchCompCheckBox.setSelected( false );
+			tallCompCheckBox.setSelected( false );
 
 			JButton myButton = new JButton( "?" );
 			myButton.putClientProperty( "JButton.buttonType", "toolBarButton" );
@@ -207,6 +208,7 @@ public class FlatWindowDecorationsTest
 
 		if( rightStretchCompCheckBox.isSelected() ) {
 			rightCompCheckBox.setSelected( false );
+			tallCompCheckBox.setSelected( false );
 
 			menuBar.add( Box.createGlue() );
 			menuBar.add( new JProgressBar() );
@@ -216,6 +218,20 @@ public class FlatWindowDecorationsTest
 		menuBar.repaint();
 	}
 
+	private void tallCompChanged() {
+		removeNonMenusFromMenuBar();
+
+		if( tallCompCheckBox.isSelected() ) {
+			rightCompCheckBox.setSelected( false );
+			rightStretchCompCheckBox.setSelected( false );
+
+			menuBar.add( new JButton( "<html>large<br>button<br>large<br>button</html>" ) );
+		}
+
+		menuBar.revalidate();
+		menuBar.repaint();
+	}
+
 	private void removeNonMenusFromMenuBar() {
 		Component[] components = menuBar.getComponents();
 		for( int i = components.length - 1; i >= 0; i-- ) {
@@ -585,6 +601,7 @@ debug*/
 		menuBarVisibleCheckBox = new JCheckBox();
 		rightCompCheckBox = new JCheckBox();
 		rightStretchCompCheckBox = new JCheckBox();
+		tallCompCheckBox = new JCheckBox();
 		JPanel panel3 = new JPanel();
 		addMenuButton = new JButton();
 		addGlueButton = new JButton();
@@ -777,6 +794,7 @@ debug*/
 				"[]" +
 				"[]" +
 				"[]" +
+				"[]" +
 				"[]"));
 
 			//---- menuBarCheckBox ----
@@ -806,6 +824,11 @@ debug*/
 			rightStretchCompCheckBox.setText("right aligned stretching component");
 			rightStretchCompCheckBox.addActionListener(e -> rightStretchCompChanged());
 			panel6.add(rightStretchCompCheckBox, "cell 0 4");
+
+			//---- tallCompCheckBox ----
+			tallCompCheckBox.setText("tall component");
+			tallCompCheckBox.addActionListener(e -> tallCompChanged());
+			panel6.add(tallCompCheckBox, "cell 0 5");
 		}
 		add(panel6, "cell 2 0");
 
@@ -1254,6 +1277,7 @@ debug*/
 	private JCheckBox menuBarVisibleCheckBox;
 	private JCheckBox rightCompCheckBox;
 	private JCheckBox rightStretchCompCheckBox;
+	private JCheckBox tallCompCheckBox;
 	private JButton addMenuButton;
 	private JButton addGlueButton;
 	private JButton addCaptionButton;

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

@@ -1,4 +1,4 @@
-JFDML JFormDesigner: "8.2.1.0.348" Java: "21.0.1" encoding: "UTF-8"
+JFDML JFormDesigner: "8.2.3.0.386" Java: "21" encoding: "UTF-8"
 
 new FormModel {
 	contentType: "form/swing"
@@ -166,7 +166,7 @@ new FormModel {
 			add( new FormContainer( "javax.swing.JPanel", new FormLayoutManager( class net.miginfocom.swing.MigLayout ) {
 				"$layoutConstraints": "ltr,hidemode 3,gap 0 0"
 				"$columnConstraints": "[left]"
-				"$rowConstraints": "[][][][][]"
+				"$rowConstraints": "[][][][][][]"
 			} ) {
 				name: "panel6"
 				"border": new javax.swing.border.TitledBorder( "Menu Bar" )
@@ -223,6 +223,16 @@ new FormModel {
 				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 					"value": "cell 0 4"
 				} )
+				add( new FormComponent( "javax.swing.JCheckBox" ) {
+					name: "tallCompCheckBox"
+					"text": "tall component"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+					addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "tallCompChanged", false ) )
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 5"
+				} )
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 				"value": "cell 2 0"
 			} )