Native window decorations: support disabling native window decorations per window via client property (issue #277)

CHANGELOG.md

@@ -3,6 +3,12 @@ FlatLaf Change Log
 
 ## 1.2-SNAPSHOT
 
+#### New features and improvements
+
+- Native window decorations: Support disabling native window decorations per
+  window. (set client property `JRootPane.useWindowDecorations` to `false` on
+  root pane).
+
 #### Fixed bugs
 
 - Native window decorations: Fixed double window title bar when first disposing

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

@@ -231,10 +231,28 @@ public interface FlatClientProperties
 
 	//---- JRootPane ----------------------------------------------------------
 
+	/**
+	 * Specifies whether FlatLaf native window decorations should be used
+	 * when creating {@code JFrame} or {@code JDialog}.
+	 * <p>
+	 * Setting this to {@code false} disables using FlatLaf native window decorations
+	 * for the window that contains the root pane. Needs to be set before showing the window.
+	 * <p>
+	 * (requires Window 10)
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JRootPane}<br>
+	 * <strong>Value type</strong> {@link java.lang.Boolean}
+	 *
+	 * @since 1.1.1
+	 */
+	String USE_WINDOW_DECORATIONS = "JRootPane.useWindowDecorations";
+
 	/**
 	 * Specifies whether the menu bar is embedded into the title pane if custom
 	 * window decorations are enabled. Default is {@code true}.
 	 * <p>
+	 * (requires Window 10)
+	 * <p>
 	 * <strong>Component</strong> {@link javax.swing.JRootPane}<br>
 	 * <strong>Value type</strong> {@link java.lang.Boolean}
 	 */

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

@@ -27,6 +27,7 @@ import javax.swing.JRootPane;
 import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
 import javax.swing.event.ChangeListener;
+import com.formdev.flatlaf.FlatClientProperties;
 import com.formdev.flatlaf.FlatLaf;
 import com.formdev.flatlaf.FlatSystemProperties;
 import com.formdev.flatlaf.ui.JBRCustomDecorations.JBRWindowTopBorder;
@@ -99,6 +100,10 @@ public class FlatNativeWindowBorder
 		if( window instanceof JFrame ) {
 			JFrame frame = (JFrame) window;
 
+			// check whether disabled via client property
+			if( !FlatClientProperties.clientPropertyBoolean( frame.getRootPane(), FlatClientProperties.USE_WINDOW_DECORATIONS, true ) )
+				return;
+
 			// do not enable native window border if JFrame should use system window decorations
 			// and if not forced to use FlatLaf/JBR native window decorations
 			if( !JFrame.isDefaultLookAndFeelDecorated() &&
@@ -119,6 +124,10 @@ public class FlatNativeWindowBorder
 		} else if( window instanceof JDialog ) {
 			JDialog dialog = (JDialog) window;
 
+			// check whether disabled via client property
+			if( !FlatClientProperties.clientPropertyBoolean( dialog.getRootPane(), FlatClientProperties.USE_WINDOW_DECORATIONS, true ) )
+				return;
+
 			// do not enable native window border if JDialog should use system window decorations
 			// and if not forced to use FlatLaf/JBR native window decorations
 			if( !JDialog.isDefaultLookAndFeelDecorated() &&

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

@@ -28,6 +28,7 @@ import java.util.WeakHashMap;
 import javax.swing.*;
 import javax.swing.plaf.metal.MetalLookAndFeel;
 import javax.swing.plaf.nimbus.NimbusLookAndFeel;
+import com.formdev.flatlaf.FlatClientProperties;
 import com.formdev.flatlaf.FlatDarculaLaf;
 import com.formdev.flatlaf.FlatDarkLaf;
 import com.formdev.flatlaf.FlatIntelliJLaf;
@@ -303,6 +304,12 @@ public class FlatNativeWindowBorderTest
 		FlatNativeWindowBorder.setHasCustomDecoration( window, nativeCheckBox.isSelected() );
 	}
 
+	private void native2Changed() {
+		((RootPaneContainer)window).getRootPane().putClientProperty( FlatClientProperties.USE_WINDOW_DECORATIONS, native2CheckBox.isSelected() );
+		window.dispose();
+		window.setVisible( true );
+	}
+
 	private void revalidateLayout() {
 		window.revalidate();
 	}
@@ -372,6 +379,7 @@ public class FlatNativeWindowBorderTest
 		undecoratedCheckBox = new JCheckBox();
 		fullScreenCheckBox = new JCheckBox();
 		nativeCheckBox = new JCheckBox();
+		native2CheckBox = new JCheckBox();
 		openDialogButton = new JButton();
 		hideWindowButton = new JButton();
 		reopenButton = new JButton();
@@ -433,6 +441,12 @@ public class FlatNativeWindowBorderTest
 		nativeCheckBox.addActionListener(e -> nativeChanged());
 		add(nativeCheckBox, "cell 0 3 3 1");
 
+		//---- native2CheckBox ----
+		native2CheckBox.setText("JRootPane.useWindowDecorations");
+		native2CheckBox.setSelected(true);
+		native2CheckBox.addActionListener(e -> native2Changed());
+		add(native2CheckBox, "cell 0 3 3 1");
+
 		//---- openDialogButton ----
 		openDialogButton.setText("Open Dialog");
 		openDialogButton.setMnemonic('D');
@@ -490,6 +504,7 @@ public class FlatNativeWindowBorderTest
 	private JCheckBox undecoratedCheckBox;
 	private JCheckBox fullScreenCheckBox;
 	private JCheckBox nativeCheckBox;
+	private JCheckBox native2CheckBox;
 	private JButton openDialogButton;
 	private JButton hideWindowButton;
 	private JButton reopenButton;

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

@@ -65,6 +65,14 @@ new FormModel {
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 				"value": "cell 0 3 3 1"
 			} )
+			add( new FormComponent( "javax.swing.JCheckBox" ) {
+				name: "native2CheckBox"
+				"text": "JRootPane.useWindowDecorations"
+				"selected": true
+				addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "native2Changed", false ) )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 3 3 1"
+			} )
 			add( new FormComponent( "javax.swing.JButton" ) {
 				name: "openDialogButton"
 				"text": "Open Dialog"