FlatLaf window decorations: added client property JRootPane.titleBarHeight to allow specifying a (larger) preferred height for the title bar (issue #897)

CHANGELOG.md

@@ -25,6 +25,9 @@ FlatLaf Change Log
 
 #### Other Changes
 
+- FlatLaf window decorations: Added client property `JRootPane.titleBarHeight`
+  to allow specifying a (larger) preferred height for the title bar. (issue
+  #897)
 - Added system property `flatlaf.useRoundedPopupBorder` to allow disabling
   native rounded popup borders on Windows 11 and macOS. On macOS 14.4+, where
   rounded popup borders are disabled since FlatLaf 3.5 because of occasional

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

@@ -626,6 +626,18 @@ public interface FlatClientProperties
 	 */
 	String TITLE_BAR_FOREGROUND = "JRootPane.titleBarForeground";
 
+	/**
+	 * Specifies the preferred height of title bar (requires enabled window decorations).
+	 * <p>
+	 * (requires Windows 10/11)
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JRootPane}<br>
+	 * <strong>Value type</strong> {@link java.lang.Integer}
+	 *
+	 * @since 3.5.2
+	 */
+	String TITLE_BAR_HEIGHT = "JRootPane.titleBarHeight";
+
 	/**
 	 * Specifies whether the glass pane should have full height and overlap the title bar,
 	 * if FlatLaf window decorations are enabled. Default is {@code false}.

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

@@ -448,6 +448,11 @@ public class FlatRootPaneUI
 					titlePane.titleBarColorsChanged();
 				break;
 
+			case FlatClientProperties.TITLE_BAR_HEIGHT:
+				if( titlePane != null )
+					titlePane.revalidate();
+				break;
+
 			case FlatClientProperties.FULL_WINDOW_CONTENT:
 				if( titlePane != null ) {
 					rootPane.getLayeredPane().setLayer( titlePane, getLayerForTitlePane() );

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

@@ -359,6 +359,10 @@ public class FlatTitlePane
 			@Override
 			public Dimension getPreferredSize() {
 				Dimension size = super.getPreferredSize();
+				int titleBarHeight = clientPropertyInt( rootPane, TITLE_BAR_HEIGHT, -1 );
+				if( titleBarHeight >= 0 )
+					return new Dimension( size.width, UIScale.scale( titleBarHeight ) );
+
 				if( buttonMaximizedHeight > 0 && isWindowMaximized() && !hasVisibleEmbeddedMenuBar( rootPane.getJMenuBar() ) ) {
 					// make title pane height smaller when frame is maximized
 					size = new Dimension( size.width, Math.min( size.height, UIScale.scale( buttonMaximizedHeight ) ) );

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

@@ -127,6 +127,9 @@ public class FlatWindowDecorationsTest
 						+ "   @ " + bounds.x + ", " + bounds.y );
 				} else
 					fullWindowContentButtonsBoundsField.setText( "null" );
+
+				fullWindowContentButtonsBoundsLabel.setEnabled( bounds != null );
+				fullWindowContentButtonsBoundsField.setEnabled( bounds != null );
 			} );
 		}
 	}
@@ -562,6 +565,16 @@ debug*/
 		}
 	}
 
+	private void titleBarHeightChanged() {
+		JRootPane rootPane = getWindowRootPane();
+		if( rootPane != null ) {
+			boolean enabled = titleBarHeightCheckBox.isSelected();
+			titleBarHeightField.setEnabled( enabled );
+
+			rootPane.putClientProperty( FlatClientProperties.TITLE_BAR_HEIGHT, enabled ? titleBarHeightField.getValue() : null );
+		}
+	}
+
 	private JRootPane getWindowRootPane() {
 		Window window = SwingUtilities.windowForComponent( this );
 		return (window instanceof RootPaneContainer)
@@ -588,12 +601,14 @@ debug*/
 		maximizedBoundsCheckBox = new JCheckBox();
 		JPanel panel4 = new JPanel();
 		showIconCheckBox = new FlatTriStateCheckBox();
+		titleBarHeightCheckBox = new JCheckBox();
 		showTitleCheckBox = new JCheckBox();
+		titleBarHeightField = new JSpinner();
 		showIconifyCheckBox = new JCheckBox();
 		showMaximizeCheckBox = new JCheckBox();
 		showCloseCheckBox = new JCheckBox();
 		fullWindowContentCheckBox = new JCheckBox();
-		JLabel fullWindowContentButtonsBoundsLabel = new JLabel();
+		fullWindowContentButtonsBoundsLabel = new JLabel();
 		fullWindowContentButtonsBoundsField = new JLabel();
 		JPanel panel6 = new JPanel();
 		menuBarCheckBox = new JCheckBox();
@@ -677,7 +692,8 @@ debug*/
 			"[fill]" +
 			"[fill]" +
 			"[]" +
-			"[]"));
+			"[]" +
+			"[40]"));
 
 		//======== panel7 ========
 		{
@@ -728,7 +744,8 @@ debug*/
 			panel4.setLayout(new MigLayout(
 				"ltr,hidemode 3,gap 0 0",
 				// columns
-				"[grow,left]",
+				"[grow,left]" +
+				"[fill]",
 				// rows
 				"[]" +
 				"[]" +
@@ -743,12 +760,23 @@ debug*/
 			showIconCheckBox.addActionListener(e -> showIconChanged());
 			panel4.add(showIconCheckBox, "cell 0 0");
 
+			//---- titleBarHeightCheckBox ----
+			titleBarHeightCheckBox.setText("Height:");
+			titleBarHeightCheckBox.addActionListener(e -> titleBarHeightChanged());
+			panel4.add(titleBarHeightCheckBox, "cell 1 0");
+
 			//---- showTitleCheckBox ----
 			showTitleCheckBox.setText("show title");
 			showTitleCheckBox.setSelected(true);
 			showTitleCheckBox.addActionListener(e -> showTitleChanged());
 			panel4.add(showTitleCheckBox, "cell 0 1");
 
+			//---- titleBarHeightField ----
+			titleBarHeightField.setEnabled(false);
+			titleBarHeightField.setModel(new SpinnerNumberModel(44, null, null, 2));
+			titleBarHeightField.addChangeListener(e -> titleBarHeightChanged());
+			panel4.add(titleBarHeightField, "cell 1 1");
+
 			//---- showIconifyCheckBox ----
 			showIconifyCheckBox.setText("show iconfiy");
 			showIconifyCheckBox.setSelected(true);
@@ -774,10 +802,12 @@ debug*/
 
 			//---- fullWindowContentButtonsBoundsLabel ----
 			fullWindowContentButtonsBoundsLabel.setText("Buttons bounds:");
+			fullWindowContentButtonsBoundsLabel.setEnabled(false);
 			panel4.add(fullWindowContentButtonsBoundsLabel, "cell 0 6");
 
 			//---- fullWindowContentButtonsBoundsField ----
 			fullWindowContentButtonsBoundsField.setText("null");
+			fullWindowContentButtonsBoundsField.setEnabled(false);
 			panel4.add(fullWindowContentButtonsBoundsField, "cell 0 6");
 		}
 		add(panel4, "cell 1 0");
@@ -1266,11 +1296,14 @@ debug*/
 	private JCheckBox fullScreenCheckBox;
 	private JCheckBox maximizedBoundsCheckBox;
 	private FlatTriStateCheckBox showIconCheckBox;
+	private JCheckBox titleBarHeightCheckBox;
 	private JCheckBox showTitleCheckBox;
+	private JSpinner titleBarHeightField;
 	private JCheckBox showIconifyCheckBox;
 	private JCheckBox showMaximizeCheckBox;
 	private JCheckBox showCloseCheckBox;
 	private JCheckBox fullWindowContentCheckBox;
+	private JLabel fullWindowContentButtonsBoundsLabel;
 	private JLabel fullWindowContentButtonsBoundsField;
 	private JCheckBox menuBarCheckBox;
 	private JCheckBox menuBarEmbeddedCheckBox;

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

@@ -9,7 +9,7 @@ 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][fill][fill][fill]"
-			"$rowConstraints": "[fill][fill][][]"
+			"$rowConstraints": "[fill][fill][][][40]"
 		} ) {
 			name: "this"
 			add( new FormContainer( "javax.swing.JPanel", new FormLayoutManager( class net.miginfocom.swing.MigLayout ) {
@@ -76,7 +76,7 @@ new FormModel {
 			} )
 			add( new FormContainer( "javax.swing.JPanel", new FormLayoutManager( class net.miginfocom.swing.MigLayout ) {
 				"$layoutConstraints": "ltr,hidemode 3,gap 0 0"
-				"$columnConstraints": "[grow,left]"
+				"$columnConstraints": "[grow,left][fill]"
 				"$rowConstraints": "[][][][][]rel[]rel[]"
 			} ) {
 				name: "panel4"
@@ -91,6 +91,16 @@ new FormModel {
 				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 					"value": "cell 0 0"
 				} )
+				add( new FormComponent( "javax.swing.JCheckBox" ) {
+					name: "titleBarHeightCheckBox"
+					"text": "Height:"
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+					addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "titleBarHeightChanged", false ) )
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 1 0"
+				} )
 				add( new FormComponent( "javax.swing.JCheckBox" ) {
 					name: "showTitleCheckBox"
 					"text": "show title"
@@ -102,6 +112,20 @@ new FormModel {
 				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 					"value": "cell 0 1"
 				} )
+				add( new FormComponent( "javax.swing.JSpinner" ) {
+					name: "titleBarHeightField"
+					"enabled": false
+					"model": new javax.swing.SpinnerNumberModel {
+						stepSize: 2
+						value: 44
+					}
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
+					addEvent( new FormEvent( "javax.swing.event.ChangeListener", "stateChanged", "titleBarHeightChanged", false ) )
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 1 1"
+				} )
 				add( new FormComponent( "javax.swing.JCheckBox" ) {
 					name: "showIconifyCheckBox"
 					"text": "show iconfiy"
@@ -148,12 +172,17 @@ new FormModel {
 				add( new FormComponent( "javax.swing.JLabel" ) {
 					name: "fullWindowContentButtonsBoundsLabel"
 					"text": "Buttons bounds:"
+					"enabled": false
+					auxiliary() {
+						"JavaCodeGenerator.variableLocal": false
+					}
 				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 					"value": "cell 0 6"
 				} )
 				add( new FormComponent( "javax.swing.JLabel" ) {
 					name: "fullWindowContentButtonsBoundsField"
 					"text": "null"
+					"enabled": false
 					auxiliary() {
 						"JavaCodeGenerator.variableLocal": false
 					}
@@ -610,7 +639,7 @@ new FormModel {
 			} )
 		}, new FormLayoutConstraints( null ) {
 			"location": new java.awt.Point( 0, 0 )
-			"size": new java.awt.Dimension( 960, 495 )
+			"size": new java.awt.Dimension( 960, 570 )
 		} )
 		add( new FormContainer( "javax.swing.JMenuBar", new FormLayoutManager( class javax.swing.JMenuBar ) ) {
 			name: "menuBar"
@@ -776,23 +805,23 @@ new FormModel {
 				} )
 			} )
 		}, new FormLayoutConstraints( null ) {
-			"location": new java.awt.Point( 0, 515 )
+			"location": new java.awt.Point( 0, 585 )
 			"size": new java.awt.Dimension( 255, 30 )
 		} )
 		add( new FormNonVisual( "javax.swing.ButtonGroup" ) {
 			name: "styleButtonGroup"
 		}, new FormLayoutConstraints( null ) {
-			"location": new java.awt.Point( 0, 565 )
+			"location": new java.awt.Point( 0, 635 )
 		} )
 		add( new FormNonVisual( "javax.swing.ButtonGroup" ) {
 			name: "iconButtonGroup"
 		}, new FormLayoutConstraints( null ) {
-			"location": new java.awt.Point( 0, 615 )
+			"location": new java.awt.Point( 0, 685 )
 		} )
 		add( new FormNonVisual( "javax.swing.ButtonGroup" ) {
 			name: "typeButtonGroup"
 		}, new FormLayoutConstraints( null ) {
-			"location": new java.awt.Point( 0, 669 )
+			"location": new java.awt.Point( 0, 740 )
 		} )
 	}
 }