DesktopPane: avoid using two instances of DefaultDesktopManager if a custom desktop manager is used/wrapped (see PR #294)

CHANGELOG.md

@@ -7,6 +7,11 @@ FlatLaf Change Log
 
 - Fixed crash when running in Webswing. (issue #290)
 
+#### Fixed bugs
+
+- DesktopPane: Fixed empty minimized icon when using a custom desktop manager.
+  (PR #294)
+
 
 ## 1.1.1
 

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

@@ -16,7 +16,10 @@
 
 package com.formdev.flatlaf.ui;
 
-import javax.swing.*;
+import javax.swing.DefaultDesktopManager;
+import javax.swing.DesktopManager;
+import javax.swing.JComponent;
+import javax.swing.JInternalFrame;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.UIResource;
 import javax.swing.plaf.basic.BasicDesktopPaneUI;
@@ -40,26 +43,35 @@ public class FlatDesktopPaneUI
 
 	@Override
 	protected void installDesktopManager() {
-		// Check current installed desktop manager
-		// to avoid recursive call with property change event (will fire a stack overflow)
-		// Do not handle install if already installed
-		DesktopManager old = desktop.getDesktopManager();
-		if (old instanceof FlatDesktopManager) return;
+		// Check current installed desktop manager to avoid recursive call
+		// with property change event (will fire a stack overflow).
+		// Do not handle install if already installed.
+		DesktopManager dm = desktop.getDesktopManager();
+		if( dm instanceof FlatDesktopManager || dm instanceof FlatWrapperDesktopManager )
+			return;
 
-		if( old == null ) {
-			// default version
-			desktopManager = new FlatDesktopManager();
+		desktopManager = (dm != null)
+			? new FlatWrapperDesktopManager( dm )
+			: new FlatDesktopManager();
+		desktop.setDesktopManager( desktopManager );
+	}
 
-		} else {
-			// create the wrapper version of the desktop manager
-			desktopManager = new FlatWrapperDesktopManager(old);
+	@Override
+	protected void uninstallDesktopManager() {
+		// uninstall wrapper
+		DesktopManager dm = desktop.getDesktopManager();
+		if( dm instanceof FlatWrapperDesktopManager )
+			desktop.setDesktopManager( ((FlatWrapperDesktopManager)dm).parent );
 
-		}
-		desktop.setDesktopManager(desktopManager);
+		super.uninstallDesktopManager();
+	}
 
+	private static void updateDockIcon( JInternalFrame f ) {
+		((FlatDesktopIconUI)f.getDesktopIcon().getUI()).updateDockIcon();
 	}
 
 	//---- class FlatDesktopManager -------------------------------------------
+
 	private class FlatDesktopManager
 		extends DefaultDesktopManager
 		implements UIResource
@@ -68,96 +80,98 @@ public class FlatDesktopPaneUI
 		public void iconifyFrame( JInternalFrame f ) {
 			super.iconifyFrame( f );
 
-			((FlatDesktopIconUI)f.getDesktopIcon().getUI()).updateDockIcon();
+			updateDockIcon( f );
 		}
 	}
 
-	//---- class for already installed desktop manager to use the flat desktop manager features
+	//---- class FlatWrapperDesktopManager ------------------------------------
+
+	/**
+	 * For already installed desktop manager to use the flat desktop manager features.
+	 */
 	private class FlatWrapperDesktopManager
-		extends FlatDesktopManager
-
+		implements DesktopManager
 	{
-		private DesktopManager parent = null;
+		private final DesktopManager parent;
 
-		private FlatWrapperDesktopManager(DesktopManager parent) {
-			super();
+		private FlatWrapperDesktopManager( DesktopManager parent ) {
 			this.parent = parent;
-
 		}
 
 		@Override
-		public void openFrame(JInternalFrame f) {
+		public void openFrame( JInternalFrame f ) {
 			parent.openFrame( f );
 		}
 
 		@Override
-		public void closeFrame(JInternalFrame f) {
+		public void closeFrame( JInternalFrame f ) {
 			parent.closeFrame( f );
 		}
 
 		@Override
-		public void maximizeFrame(JInternalFrame f) {
+		public void maximizeFrame( JInternalFrame f ) {
 			parent.maximizeFrame( f );
 		}
 
 		@Override
-		public void minimizeFrame(JInternalFrame f) {
+		public void minimizeFrame( JInternalFrame f ) {
 			parent.minimizeFrame( f );
 		}
 
 		@Override
-		public void activateFrame(JInternalFrame f) {
+		public void activateFrame( JInternalFrame f ) {
 			parent.activateFrame( f );
 		}
 
 		@Override
-		public void deactivateFrame(JInternalFrame f) {
+		public void deactivateFrame( JInternalFrame f ) {
 			parent.deactivateFrame( f );
 		}
 
 		@Override
 		public void iconifyFrame( JInternalFrame f ) {
-			super.iconifyFrame( f );
+			parent.iconifyFrame( f );
 
+			updateDockIcon( f );
 		}
 
 		@Override
 		public void deiconifyFrame( JInternalFrame f ) {
-			super.deiconifyFrame( f );
+			parent.deiconifyFrame( f );
 		}
 
 		@Override
-		public void beginDraggingFrame(JComponent f) {
+		public void beginDraggingFrame( JComponent f ) {
 			parent.beginDraggingFrame( f );
 		}
 
 		@Override
-		public void dragFrame(JComponent f, int newX, int newY) {
+		public void dragFrame( JComponent f, int newX, int newY ) {
 			parent.dragFrame( f, newX, newY );
 		}
 
 		@Override
-		public void endDraggingFrame(JComponent f) {
+		public void endDraggingFrame( JComponent f ) {
 			parent.endDraggingFrame( f );
 		}
 
 		@Override
-		public void beginResizingFrame(JComponent f, int direction) {
+		public void beginResizingFrame( JComponent f, int direction ) {
 			parent.beginResizingFrame( f, direction );
 		}
 
 		@Override
-		public void resizeFrame(JComponent f, int newX, int newY, int newWidth, int newHeight) {
+		public void resizeFrame( JComponent f, int newX, int newY, int newWidth, int newHeight ) {
 			parent.resizeFrame( f, newX, newY, newWidth, newHeight );
 		}
 
 		@Override
-		public void endResizingFrame(JComponent f) {
+		public void endResizingFrame( JComponent f ) {
 			parent.endResizingFrame( f );
 		}
 
 		@Override
-		public void setBoundsForFrame(JComponent f, int newX, int newY, int newWidth, int newHeight) {
+		public void setBoundsForFrame( JComponent f, int newX, int newY, int newWidth, int newHeight ) {
 			parent.setBoundsForFrame( f, newX, newY, newWidth, newHeight );
 		}
 	}

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

@@ -107,6 +107,12 @@ public class FlatInternalFrameTest
 		frameCount++;
 	}
 
+	private void customDesktopManagerChanged() {
+		desktopPane.setDesktopManager( customDesktopManagerCheckBox.isSelected()
+			? new CustomDesktopManager()
+			: null );
+	}
+
 	private void initComponents() {
 		// JFormDesigner - Component initialization - DO NOT MODIFY  //GEN-BEGIN:initComponents
 		desktopPane = new JDesktopPane();
@@ -120,6 +126,8 @@ public class FlatInternalFrameTest
 		titleLabel = new JLabel();
 		titleField = new JTextField();
 		createFrameButton = new JButton();
+		panel1 = new JPanel();
+		customDesktopManagerCheckBox = new JCheckBox();
 
 		//======== this ========
 		setLayout(new MigLayout(
@@ -127,7 +135,8 @@ public class FlatInternalFrameTest
 			// columns
 			"[grow,fill]",
 			// rows
-			"[grow,fill]"));
+			"[grow,fill]" +
+			"[]"));
 
 		//======== desktopPane ========
 		{
@@ -194,6 +203,22 @@ public class FlatInternalFrameTest
 			palette.setBounds(15, 25, 275, 185);
 		}
 		add(desktopPane, "cell 0 0,width 600,height 600");
+
+		//======== panel1 ========
+		{
+			panel1.setLayout(new MigLayout(
+				"insets 0,hidemode 3",
+				// columns
+				"[fill]",
+				// rows
+				"[]"));
+
+			//---- customDesktopManagerCheckBox ----
+			customDesktopManagerCheckBox.setText("custom desktop manager");
+			customDesktopManagerCheckBox.addActionListener(e -> customDesktopManagerChanged());
+			panel1.add(customDesktopManagerCheckBox, "cell 0 0");
+		}
+		add(panel1, "cell 0 1");
 		// JFormDesigner - End of component initialization  //GEN-END:initComponents
 
 		if( UIScale.getUserScaleFactor() > 1 )
@@ -212,5 +237,37 @@ public class FlatInternalFrameTest
 	private JLabel titleLabel;
 	private JTextField titleField;
 	private JButton createFrameButton;
+	private JPanel panel1;
+	private JCheckBox customDesktopManagerCheckBox;
 	// JFormDesigner - End of variables declaration  //GEN-END:variables
+
+	//---- class CustomDesktopManager -----------------------------------------
+
+	private static class CustomDesktopManager
+		extends DefaultDesktopManager
+	{
+		@Override
+		public void activateFrame( JInternalFrame f ) {
+			System.out.println( "activateFrame: " + f.getTitle() );
+			super.activateFrame( f );
+		}
+
+		@Override
+		public void deactivateFrame( JInternalFrame f ) {
+			System.out.println( "deactivateFrame: " + f.getTitle() );
+			super.deactivateFrame( f );
+		}
+
+		@Override
+		public void iconifyFrame( JInternalFrame f ) {
+			System.out.println( "iconifyFrame: " + f.getTitle() );
+			super.iconifyFrame( f );
+		}
+
+		@Override
+		public void deiconifyFrame( JInternalFrame f ) {
+			System.out.println( "deiconifyFrame: " + f.getTitle() );
+			super.deiconifyFrame( f );
+		}
+	}
 }

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

@@ -1,4 +1,4 @@
-JFDML JFormDesigner: "7.0.2.0.298" Java: "14" encoding: "UTF-8"
+JFDML JFormDesigner: "7.0.3.1.342" Java: "16" encoding: "UTF-8"
 
 new FormModel {
 	contentType: "form/swing"
@@ -6,7 +6,7 @@ new FormModel {
 		add( new FormContainer( "com.formdev.flatlaf.testing.FlatTestPanel", new FormLayoutManager( class net.miginfocom.swing.MigLayout ) {
 			"$layoutConstraints": "insets dialog,hidemode 3"
 			"$columnConstraints": "[grow,fill]"
-			"$rowConstraints": "[grow,fill]"
+			"$rowConstraints": "[grow,fill][]"
 		} ) {
 			name: "this"
 			add( new FormContainer( "javax.swing.JDesktopPane", new FormLayoutManager( class javax.swing.JDesktopPane ) ) {
@@ -90,6 +90,22 @@ new FormModel {
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 				"value": "cell 0 0,width 600,height 600"
 			} )
+			add( new FormContainer( "javax.swing.JPanel", new FormLayoutManager( class net.miginfocom.swing.MigLayout ) {
+				"$layoutConstraints": "insets 0,hidemode 3"
+				"$columnConstraints": "[fill]"
+				"$rowConstraints": "[]"
+			} ) {
+				name: "panel1"
+				add( new FormComponent( "javax.swing.JCheckBox" ) {
+					name: "customDesktopManagerCheckBox"
+					"text": "custom desktop manager"
+					addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "customDesktopManagerChanged", false ) )
+				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+					"value": "cell 0 0"
+				} )
+			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
+				"value": "cell 0 1"
+			} )
 		}, new FormLayoutConstraints( null ) {
 			"location": new java.awt.Point( 0, 0 )
 			"size": new java.awt.Dimension( 500, 515 )