Menu: hide mnemonics by default and show them only when Alt key is pressed (issue #43)

CHANGELOG.md

@@ -3,6 +3,8 @@ FlatLaf Change Log
 
 ## Unreleased
 
+- Hide menu mnemonics by default and show them only when <kbd>Alt</kbd> key is
+  pressed. (issue #43)
 - TabbedPane: In scroll-tab-layout, the cropped line is now hidden. (issue #40)
 - Tree: UI default value `Tree.textBackground` now has a valid color and is no
   longer `null`.

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

@@ -28,6 +28,7 @@ import java.awt.Window;
 import java.awt.event.KeyEvent;
 import java.beans.PropertyChangeEvent;
 import java.beans.PropertyChangeListener;
+import java.lang.ref.WeakReference;
 import java.util.List;
 import java.util.function.Consumer;
 import java.util.logging.Level;
@@ -66,6 +67,7 @@ public abstract class FlatLaf
 
 	private KeyEventPostProcessor mnemonicListener;
 	private static boolean showMnemonics;
+	private static WeakReference<Window> lastShowMnemonicWindow;
 
 	private Consumer<UIDefaults> postInitialization;
 
@@ -391,18 +393,28 @@ public abstract class FlatLaf
 		if( !UIManager.getBoolean( "Component.hideMnemonics" ) )
 			return;
 
-		// get focus owner
+		if( show ) {
-		Component focusOwner = KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner();
+			// get focus owner
-		if( focusOwner == null )
+			Component focusOwner = KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner();
-			return;
+			if( focusOwner == null )
+				return;
 
-		// get focused window
+			// get focused window
-		Window window = SwingUtilities.windowForComponent( focusOwner );
+			Window window = SwingUtilities.windowForComponent( focusOwner );
-		if( window == null )
+			if( window == null )
-			return;
+				return;
 
-		// repaint components with mnemonics in focused window
+			// repaint components with mnemonics in focused window
-		repaintMnemonics( window );
+			repaintMnemonics( window );
+
+			lastShowMnemonicWindow = new WeakReference<>( window );
+		} else if( lastShowMnemonicWindow != null ) {
+			Window window = lastShowMnemonicWindow.get();
+			if( window != null )
+				repaintMnemonics( window );
+
+			lastShowMnemonicWindow = null;
+		}
 	}
 
 	private static void repaintMnemonics( Container container ) {

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

@@ -17,8 +17,11 @@
 package com.formdev.flatlaf.ui;
 
 import static com.formdev.flatlaf.util.UIScale.scale;
+import java.awt.Graphics;
+import java.awt.Rectangle;
 import java.beans.PropertyChangeListener;
 import javax.swing.JComponent;
+import javax.swing.JMenuItem;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicCheckBoxMenuItemUI;
 
@@ -74,4 +77,9 @@ public class FlatCheckBoxMenuItemUI
 				defaultTextIconGap = scale( defaultTextIconGap );
 		};
 	}
+
+	@Override
+	protected void paintText( Graphics g, JMenuItem menuItem, Rectangle textRect, String text ) {
+		FlatMenuItemUI.paintText( g, menuItem, textRect, text, disabledForeground, selectionForeground );
+	}
 }

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

@@ -17,10 +17,18 @@
 package com.formdev.flatlaf.ui;
 
 import static com.formdev.flatlaf.util.UIScale.scale;
+import java.awt.Color;
+import java.awt.FontMetrics;
+import java.awt.Graphics;
+import java.awt.Rectangle;
 import java.beans.PropertyChangeListener;
+import javax.swing.ButtonModel;
 import javax.swing.JComponent;
+import javax.swing.JMenu;
+import javax.swing.JMenuItem;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicMenuItemUI;
+import com.formdev.flatlaf.FlatLaf;
 
 /**
  * Provides the Flat LaF UI delegate for {@link javax.swing.JMenuItem}.
@@ -74,4 +82,26 @@ public class FlatMenuItemUI
 				defaultTextIconGap = scale( defaultTextIconGap );
 		};
 	}
+
+	@Override
+	protected void paintText( Graphics g, JMenuItem menuItem, Rectangle textRect, String text ) {
+		paintText( g, menuItem, textRect, text, disabledForeground, selectionForeground );
+	}
+
+	public static void paintText( Graphics g, JMenuItem menuItem, Rectangle textRect,
+		String text, Color disabledForeground, Color selectionForeground )
+	{
+		FontMetrics fm = menuItem.getFontMetrics( menuItem.getFont() );
+		int mnemonicIndex = FlatLaf.isShowMnemonics() ? menuItem.getDisplayedMnemonicIndex() : -1;
+
+		ButtonModel model = menuItem.getModel();
+		g.setColor( !model.isEnabled()
+			? disabledForeground
+			: (model.isArmed() || (menuItem instanceof JMenu && model.isSelected())
+				? selectionForeground
+				: menuItem.getForeground()) );
+
+		FlatUIUtils.drawStringUnderlineCharAt( menuItem, g, text, mnemonicIndex,
+			textRect.x, textRect.y + fm.getAscent() );
+	}
 }

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

@@ -17,8 +17,11 @@
 package com.formdev.flatlaf.ui;
 
 import static com.formdev.flatlaf.util.UIScale.scale;
+import java.awt.Graphics;
+import java.awt.Rectangle;
 import java.beans.PropertyChangeListener;
 import javax.swing.JComponent;
+import javax.swing.JMenuItem;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicMenuUI;
 
@@ -77,4 +80,9 @@ public class FlatMenuUI
 				defaultTextIconGap = scale( defaultTextIconGap );
 		};
 	}
+
+	@Override
+	protected void paintText( Graphics g, JMenuItem menuItem, Rectangle textRect, String text ) {
+		FlatMenuItemUI.paintText( g, menuItem, textRect, text, disabledForeground, selectionForeground );
+	}
 }

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

@@ -17,8 +17,11 @@
 package com.formdev.flatlaf.ui;
 
 import static com.formdev.flatlaf.util.UIScale.scale;
+import java.awt.Graphics;
+import java.awt.Rectangle;
 import java.beans.PropertyChangeListener;
 import javax.swing.JComponent;
+import javax.swing.JMenuItem;
 import javax.swing.plaf.ComponentUI;
 import javax.swing.plaf.basic.BasicRadioButtonMenuItemUI;
 
@@ -74,4 +77,9 @@ public class FlatRadioButtonMenuItemUI
 				defaultTextIconGap = scale( defaultTextIconGap );
 		};
 	}
+
+	@Override
+	protected void paintText( Graphics g, JMenuItem menuItem, Rectangle textRect, String text ) {
+		FlatMenuItemUI.paintText( g, menuItem, textRect, text, disabledForeground, selectionForeground );
+	}
 }

flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/DemoFrame.java

@@ -51,6 +51,12 @@ class DemoFrame
 		DemoPrefs.getState().putInt( FlatLafDemo.KEY_TAB, tabbedPane.getSelectedIndex() );
 	}
 
+	private void menuItemActionPerformed(ActionEvent e) {
+		SwingUtilities.invokeLater( () -> {
+			JOptionPane.showMessageDialog( this, e.getActionCommand(), "Menu Item", JOptionPane.PLAIN_MESSAGE );
+		} );
+	}
+
 	private void initComponents() {
 		// JFormDesigner - Component initialization - DO NOT MODIFY  //GEN-BEGIN:initComponents
 		JMenuBar menuBar1 = new JMenuBar();
@@ -68,6 +74,14 @@ class DemoFrame
 		JMenuItem deleteMenuItem = new JMenuItem();
 		JMenu viewMenu = new JMenu();
 		JCheckBoxMenuItem checkBoxMenuItem1 = new JCheckBoxMenuItem();
+		JMenu menu1 = new JMenu();
+		JMenu subViewsMenu = new JMenu();
+		JMenu subSubViewsMenu = new JMenu();
+		JMenuItem errorLogViewMenuItem = new JMenuItem();
+		JMenuItem searchViewMenuItem = new JMenuItem();
+		JMenuItem projectViewMenuItem = new JMenuItem();
+		JMenuItem structureViewMenuItem = new JMenuItem();
+		JMenuItem propertiesViewMenuItem = new JMenuItem();
 		JRadioButtonMenuItem radioButtonMenuItem1 = new JRadioButtonMenuItem();
 		JRadioButtonMenuItem radioButtonMenuItem2 = new JRadioButtonMenuItem();
 		JRadioButtonMenuItem radioButtonMenuItem3 = new JRadioButtonMenuItem();
@@ -103,27 +117,35 @@ class DemoFrame
 			//======== fileMenu ========
 			{
 				fileMenu.setText("File");
+				fileMenu.setMnemonic('F');
 
 				//---- newMenuItem ----
 				newMenuItem.setText("New");
 				newMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N, Toolkit.getDefaultToolkit().getMenuShortcutKeyMask()));
+				newMenuItem.setMnemonic('N');
+				newMenuItem.addActionListener(e -> menuItemActionPerformed(e));
 				fileMenu.add(newMenuItem);
 
 				//---- openMenuItem ----
 				openMenuItem.setText("Open");
 				openMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O, Toolkit.getDefaultToolkit().getMenuShortcutKeyMask()));
+				openMenuItem.setMnemonic('O');
+				openMenuItem.addActionListener(e -> menuItemActionPerformed(e));
 				fileMenu.add(openMenuItem);
 				fileMenu.addSeparator();
 
 				//---- closeMenuItem ----
 				closeMenuItem.setText("Close");
 				closeMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_W, Toolkit.getDefaultToolkit().getMenuShortcutKeyMask()));
+				closeMenuItem.setMnemonic('C');
+				closeMenuItem.addActionListener(e -> menuItemActionPerformed(e));
 				fileMenu.add(closeMenuItem);
 				fileMenu.addSeparator();
 
 				//---- exitMenuItem ----
 				exitMenuItem.setText("Exit");
 				exitMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Q, Toolkit.getDefaultToolkit().getMenuShortcutKeyMask()));
+				exitMenuItem.setMnemonic('X');
 				exitMenuItem.addActionListener(e -> exitActionPerformed());
 				fileMenu.add(exitMenuItem);
 			}
@@ -132,37 +154,50 @@ class DemoFrame
 			//======== editMenu ========
 			{
 				editMenu.setText("Edit");
+				editMenu.setMnemonic('E');
 
 				//---- undoMenuItem ----
 				undoMenuItem.setText("Undo");
 				undoMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Z, Toolkit.getDefaultToolkit().getMenuShortcutKeyMask()));
+				undoMenuItem.setMnemonic('U');
+				undoMenuItem.addActionListener(e -> menuItemActionPerformed(e));
 				editMenu.add(undoMenuItem);
 
 				//---- redoMenuItem ----
 				redoMenuItem.setText("Redo");
 				redoMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Y, Toolkit.getDefaultToolkit().getMenuShortcutKeyMask()));
+				redoMenuItem.setMnemonic('R');
+				redoMenuItem.addActionListener(e -> menuItemActionPerformed(e));
 				editMenu.add(redoMenuItem);
 				editMenu.addSeparator();
 
 				//---- cutMenuItem ----
 				cutMenuItem.setText("Cut");
 				cutMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X, Toolkit.getDefaultToolkit().getMenuShortcutKeyMask()));
+				cutMenuItem.setMnemonic('C');
+				cutMenuItem.addActionListener(e -> menuItemActionPerformed(e));
 				editMenu.add(cutMenuItem);
 
 				//---- copyMenuItem ----
 				copyMenuItem.setText("Copy");
 				copyMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C, Toolkit.getDefaultToolkit().getMenuShortcutKeyMask()));
+				copyMenuItem.setMnemonic('O');
+				copyMenuItem.addActionListener(e -> menuItemActionPerformed(e));
 				editMenu.add(copyMenuItem);
 
 				//---- pasteMenuItem ----
 				pasteMenuItem.setText("Paste");
 				pasteMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V, Toolkit.getDefaultToolkit().getMenuShortcutKeyMask()));
+				pasteMenuItem.setMnemonic('P');
+				pasteMenuItem.addActionListener(e -> menuItemActionPerformed(e));
 				editMenu.add(pasteMenuItem);
 				editMenu.addSeparator();
 
 				//---- deleteMenuItem ----
 				deleteMenuItem.setText("Delete");
 				deleteMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_DELETE, 0));
+				deleteMenuItem.setMnemonic('D');
+				deleteMenuItem.addActionListener(e -> menuItemActionPerformed(e));
 				editMenu.add(deleteMenuItem);
 			}
 			menuBar1.add(editMenu);
@@ -170,24 +205,84 @@ class DemoFrame
 			//======== viewMenu ========
 			{
 				viewMenu.setText("View");
+				viewMenu.setMnemonic('V');
 
 				//---- checkBoxMenuItem1 ----
 				checkBoxMenuItem1.setText("Show Toolbar");
 				checkBoxMenuItem1.setSelected(true);
+				checkBoxMenuItem1.setMnemonic('T');
+				checkBoxMenuItem1.addActionListener(e -> menuItemActionPerformed(e));
 				viewMenu.add(checkBoxMenuItem1);
+
+				//======== menu1 ========
+				{
+					menu1.setText("Show View");
+					menu1.setMnemonic('V');
+
+					//======== subViewsMenu ========
+					{
+						subViewsMenu.setText("Sub Views");
+						subViewsMenu.setMnemonic('S');
+
+						//======== subSubViewsMenu ========
+						{
+							subSubViewsMenu.setText("Sub sub Views");
+							subSubViewsMenu.setMnemonic('U');
+
+							//---- errorLogViewMenuItem ----
+							errorLogViewMenuItem.setText("Error Log");
+							errorLogViewMenuItem.setMnemonic('E');
+							errorLogViewMenuItem.addActionListener(e -> menuItemActionPerformed(e));
+							subSubViewsMenu.add(errorLogViewMenuItem);
+						}
+						subViewsMenu.add(subSubViewsMenu);
+
+						//---- searchViewMenuItem ----
+						searchViewMenuItem.setText("Search");
+						searchViewMenuItem.setMnemonic('S');
+						searchViewMenuItem.addActionListener(e -> menuItemActionPerformed(e));
+						subViewsMenu.add(searchViewMenuItem);
+					}
+					menu1.add(subViewsMenu);
+
+					//---- projectViewMenuItem ----
+					projectViewMenuItem.setText("Project");
+					projectViewMenuItem.setMnemonic('P');
+					projectViewMenuItem.addActionListener(e -> menuItemActionPerformed(e));
+					menu1.add(projectViewMenuItem);
+
+					//---- structureViewMenuItem ----
+					structureViewMenuItem.setText("Structure");
+					structureViewMenuItem.setMnemonic('T');
+					structureViewMenuItem.addActionListener(e -> menuItemActionPerformed(e));
+					menu1.add(structureViewMenuItem);
+
+					//---- propertiesViewMenuItem ----
+					propertiesViewMenuItem.setText("Properties");
+					propertiesViewMenuItem.setMnemonic('O');
+					propertiesViewMenuItem.addActionListener(e -> menuItemActionPerformed(e));
+					menu1.add(propertiesViewMenuItem);
+				}
+				viewMenu.add(menu1);
 				viewMenu.addSeparator();
 
 				//---- radioButtonMenuItem1 ----
 				radioButtonMenuItem1.setText("Details");
 				radioButtonMenuItem1.setSelected(true);
+				radioButtonMenuItem1.setMnemonic('D');
+				radioButtonMenuItem1.addActionListener(e -> menuItemActionPerformed(e));
 				viewMenu.add(radioButtonMenuItem1);
 
 				//---- radioButtonMenuItem2 ----
 				radioButtonMenuItem2.setText("Small Icons");
+				radioButtonMenuItem2.setMnemonic('S');
+				radioButtonMenuItem2.addActionListener(e -> menuItemActionPerformed(e));
 				viewMenu.add(radioButtonMenuItem2);
 
 				//---- radioButtonMenuItem3 ----
 				radioButtonMenuItem3.setText("Large Icons");
+				radioButtonMenuItem3.setMnemonic('L');
+				radioButtonMenuItem3.addActionListener(e -> menuItemActionPerformed(e));
 				viewMenu.add(radioButtonMenuItem3);
 			}
 			menuBar1.add(viewMenu);
@@ -195,9 +290,11 @@ class DemoFrame
 			//======== helpMenu ========
 			{
 				helpMenu.setText("Help");
+				helpMenu.setMnemonic('H');
 
 				//---- aboutMenuItem ----
 				aboutMenuItem.setText("About");
+				aboutMenuItem.setMnemonic('A');
 				aboutMenuItem.addActionListener(e -> aboutActionPerformed());
 				helpMenu.add(aboutMenuItem);
 			}

flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/DemoFrame.jfd

@@ -1,4 +1,4 @@
-JFDML JFormDesigner: "7.0.0.0.194" Java: "11.0.2" encoding: "UTF-8"
+JFDML JFormDesigner: "7.0.0.0.194" Java: "13.0.1" encoding: "UTF-8"
 
 new FormModel {
 	contentType: "form/swing"
@@ -117,15 +117,20 @@ new FormModel {
 				add( new FormContainer( "javax.swing.JMenu", new FormLayoutManager( class javax.swing.JMenu ) ) {
 					name: "fileMenu"
 					"text": "File"
+					"mnemonic": 70
 					add( new FormComponent( "javax.swing.JMenuItem" ) {
 						name: "newMenuItem"
 						"text": "New"
 						"accelerator": static javax.swing.KeyStroke getKeyStroke( 78, 4226, false )
+						"mnemonic": 78
+						addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "menuItemActionPerformed", true ) )
 					} )
 					add( new FormComponent( "javax.swing.JMenuItem" ) {
 						name: "openMenuItem"
 						"text": "Open"
 						"accelerator": static javax.swing.KeyStroke getKeyStroke( 79, 4226, false )
+						"mnemonic": 79
+						addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "menuItemActionPerformed", true ) )
 					} )
 					add( new FormComponent( "javax.swing.JPopupMenu$Separator" ) {
 						name: "separator2"
@@ -134,6 +139,8 @@ new FormModel {
 						name: "closeMenuItem"
 						"text": "Close"
 						"accelerator": static javax.swing.KeyStroke getKeyStroke( 87, 4226, false )
+						"mnemonic": 67
+						addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "menuItemActionPerformed", true ) )
 					} )
 					add( new FormComponent( "javax.swing.JPopupMenu$Separator" ) {
 						name: "separator1"
@@ -142,21 +149,27 @@ new FormModel {
 						name: "exitMenuItem"
 						"text": "Exit"
 						"accelerator": static javax.swing.KeyStroke getKeyStroke( 81, 4226, false )
+						"mnemonic": 88
 						addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "exitActionPerformed", false ) )
 					} )
 				} )
 				add( new FormContainer( "javax.swing.JMenu", new FormLayoutManager( class javax.swing.JMenu ) ) {
 					name: "editMenu"
 					"text": "Edit"
+					"mnemonic": 69
 					add( new FormComponent( "javax.swing.JMenuItem" ) {
 						name: "undoMenuItem"
 						"text": "Undo"
 						"accelerator": static javax.swing.KeyStroke getKeyStroke( 90, 4226, false )
+						"mnemonic": 85
+						addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "menuItemActionPerformed", true ) )
 					} )
 					add( new FormComponent( "javax.swing.JMenuItem" ) {
 						name: "redoMenuItem"
 						"text": "Redo"
 						"accelerator": static javax.swing.KeyStroke getKeyStroke( 89, 4226, false )
+						"mnemonic": 82
+						addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "menuItemActionPerformed", true ) )
 					} )
 					add( new FormComponent( "javax.swing.JPopupMenu$Separator" ) {
 						name: "separator4"
@@ -165,16 +178,22 @@ new FormModel {
 						name: "cutMenuItem"
 						"text": "Cut"
 						"accelerator": static javax.swing.KeyStroke getKeyStroke( 88, 4226, false )
+						"mnemonic": 67
+						addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "menuItemActionPerformed", true ) )
 					} )
 					add( new FormComponent( "javax.swing.JMenuItem" ) {
 						name: "copyMenuItem"
 						"text": "Copy"
 						"accelerator": static javax.swing.KeyStroke getKeyStroke( 67, 4226, false )
+						"mnemonic": 79
+						addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "menuItemActionPerformed", true ) )
 					} )
 					add( new FormComponent( "javax.swing.JMenuItem" ) {
 						name: "pasteMenuItem"
 						"text": "Paste"
 						"accelerator": static javax.swing.KeyStroke getKeyStroke( 86, 4226, false )
+						"mnemonic": 80
+						addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "menuItemActionPerformed", true ) )
 					} )
 					add( new FormComponent( "javax.swing.JPopupMenu$Separator" ) {
 						name: "separator3"
@@ -183,15 +202,65 @@ new FormModel {
 						name: "deleteMenuItem"
 						"text": "Delete"
 						"accelerator": static javax.swing.KeyStroke getKeyStroke( 127, 0, false )
+						"mnemonic": 68
+						addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "menuItemActionPerformed", true ) )
 					} )
 				} )
 				add( new FormContainer( "javax.swing.JMenu", new FormLayoutManager( class javax.swing.JMenu ) ) {
 					name: "viewMenu"
 					"text": "View"
+					"mnemonic": 86
 					add( new FormComponent( "javax.swing.JCheckBoxMenuItem" ) {
 						name: "checkBoxMenuItem1"
 						"text": "Show Toolbar"
 						"selected": true
+						"mnemonic": 84
+						addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "menuItemActionPerformed", true ) )
+					} )
+					add( new FormContainer( "javax.swing.JMenu", new FormLayoutManager( class javax.swing.JMenu ) ) {
+						name: "menu1"
+						"text": "Show View"
+						"mnemonic": 86
+						add( new FormContainer( "javax.swing.JMenu", new FormLayoutManager( class javax.swing.JMenu ) ) {
+							name: "subViewsMenu"
+							"text": "Sub Views"
+							"mnemonic": 83
+							add( new FormContainer( "javax.swing.JMenu", new FormLayoutManager( class javax.swing.JMenu ) ) {
+								name: "subSubViewsMenu"
+								"text": "Sub sub Views"
+								"mnemonic": 85
+								add( new FormComponent( "javax.swing.JMenuItem" ) {
+									name: "errorLogViewMenuItem"
+									"text": "Error Log"
+									"mnemonic": 69
+									addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "menuItemActionPerformed", true ) )
+								} )
+							} )
+							add( new FormComponent( "javax.swing.JMenuItem" ) {
+								name: "searchViewMenuItem"
+								"text": "Search"
+								"mnemonic": 83
+								addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "menuItemActionPerformed", true ) )
+							} )
+						} )
+						add( new FormComponent( "javax.swing.JMenuItem" ) {
+							name: "projectViewMenuItem"
+							"text": "Project"
+							"mnemonic": 80
+							addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "menuItemActionPerformed", true ) )
+						} )
+						add( new FormComponent( "javax.swing.JMenuItem" ) {
+							name: "structureViewMenuItem"
+							"text": "Structure"
+							"mnemonic": 84
+							addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "menuItemActionPerformed", true ) )
+						} )
+						add( new FormComponent( "javax.swing.JMenuItem" ) {
+							name: "propertiesViewMenuItem"
+							"text": "Properties"
+							"mnemonic": 79
+							addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "menuItemActionPerformed", true ) )
+						} )
 					} )
 					add( new FormComponent( "javax.swing.JPopupMenu$Separator" ) {
 						name: "separator8"
@@ -201,24 +270,32 @@ new FormModel {
 						"text": "Details"
 						"selected": true
 						"$buttonGroup": new FormReference( "buttonGroup1" )
+						"mnemonic": 68
+						addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "menuItemActionPerformed", true ) )
 					} )
 					add( new FormComponent( "javax.swing.JRadioButtonMenuItem" ) {
 						name: "radioButtonMenuItem2"
 						"text": "Small Icons"
 						"$buttonGroup": new FormReference( "buttonGroup1" )
+						"mnemonic": 83
+						addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "menuItemActionPerformed", true ) )
 					} )
 					add( new FormComponent( "javax.swing.JRadioButtonMenuItem" ) {
 						name: "radioButtonMenuItem3"
 						"text": "Large Icons"
 						"$buttonGroup": new FormReference( "buttonGroup1" )
+						"mnemonic": 76
+						addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "menuItemActionPerformed", true ) )
 					} )
 				} )
 				add( new FormContainer( "javax.swing.JMenu", new FormLayoutManager( class javax.swing.JMenu ) ) {
 					name: "helpMenu"
 					"text": "Help"
+					"mnemonic": 72
 					add( new FormComponent( "javax.swing.JMenuItem" ) {
 						name: "aboutMenuItem"
 						"text": "About"
+						"mnemonic": 65
 						addEvent( new FormEvent( "java.awt.event.ActionListener", "actionPerformed", "aboutActionPerformed", false ) )
 					} )
 				} )

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

@@ -126,13 +126,16 @@ public class FlatMenusTest
 			//======== menu5 ========
 			{
 				menu5.setText("text");
+				menu5.setMnemonic('T');
 
 				//---- menuItem7 ----
 				menuItem7.setText("text");
+				menuItem7.setMnemonic('X');
 				menu5.add(menuItem7);
 
 				//---- menuItem8 ----
 				menuItem8.setText("text");
+				menuItem8.setMnemonic('E');
 				menu5.add(menuItem8);
 			}
 			menuBar1.add(menu5);
@@ -175,6 +178,7 @@ public class FlatMenusTest
 			//======== menu1 ========
 			{
 				menu1.setText("enabled");
+				menu1.setMnemonic('E');
 			}
 			panel1.add(menu1, "cell 1 0");
 
@@ -185,6 +189,7 @@ public class FlatMenusTest
 			//---- menuItem1 ----
 			menuItem1.setText("enabled");
 			menuItem1.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_A, KeyEvent.CTRL_MASK));
+			menuItem1.setMnemonic('N');
 			panel1.add(menuItem1, "cell 1 1");
 
 			//---- checkBoxMenuItemLabel ----
@@ -194,6 +199,7 @@ public class FlatMenusTest
 			//---- checkBoxMenuItem1 ----
 			checkBoxMenuItem1.setText("enabled");
 			checkBoxMenuItem1.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_F1, 0));
+			checkBoxMenuItem1.setMnemonic('A');
 			panel1.add(checkBoxMenuItem1, "cell 1 2");
 
 			//---- radioButtonMenuItemLabel ----
@@ -203,6 +209,7 @@ public class FlatMenusTest
 			//---- radioButtonMenuItem1 ----
 			radioButtonMenuItem1.setText("enabled");
 			radioButtonMenuItem1.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_F1, 0));
+			radioButtonMenuItem1.setMnemonic('B');
 			panel1.add(radioButtonMenuItem1, "cell 1 3");
 
 			//---- popupMenuSeparatorLabel ----
@@ -230,6 +237,7 @@ public class FlatMenusTest
 			{
 				menu2.setText("disabled");
 				menu2.setEnabled(false);
+				menu2.setMnemonic('D');
 			}
 			panel2.add(menu2, "cell 0 0");
 
@@ -237,18 +245,21 @@ public class FlatMenusTest
 			menuItem2.setText("disabled");
 			menuItem2.setEnabled(false);
 			menuItem2.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_D, KeyEvent.ALT_MASK|KeyEvent.SHIFT_MASK));
+			menuItem2.setMnemonic('I');
 			panel2.add(menuItem2, "cell 0 1");
 
 			//---- checkBoxMenuItem2 ----
 			checkBoxMenuItem2.setText("disabled");
 			checkBoxMenuItem2.setEnabled(false);
 			checkBoxMenuItem2.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_F1, 0));
+			checkBoxMenuItem2.setMnemonic('S');
 			panel2.add(checkBoxMenuItem2, "cell 0 2");
 
 			//---- radioButtonMenuItem2 ----
 			radioButtonMenuItem2.setText("disabled");
 			radioButtonMenuItem2.setEnabled(false);
 			radioButtonMenuItem2.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_F1, 0));
+			radioButtonMenuItem2.setMnemonic('L');
 			panel2.add(radioButtonMenuItem2, "cell 0 3");
 		}
 		add(panel2, "cell 2 1");

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

@@ -1,4 +1,4 @@
-JFDML JFormDesigner: "7.0.0.0.194" Java: "11.0.2" encoding: "UTF-8"
+JFDML JFormDesigner: "7.0.0.0.194" Java: "13.0.1" encoding: "UTF-8"
 
 new FormModel {
 	contentType: "form/swing"
@@ -23,13 +23,16 @@ new FormModel {
 				add( new FormContainer( "javax.swing.JMenu", new FormLayoutManager( class javax.swing.JMenu ) ) {
 					name: "menu5"
 					"text": "text"
+					"mnemonic": 84
 					add( new FormComponent( "javax.swing.JMenuItem" ) {
 						name: "menuItem7"
 						"text": "text"
+						"mnemonic": 88
 					} )
 					add( new FormComponent( "javax.swing.JMenuItem" ) {
 						name: "menuItem8"
 						"text": "text"
+						"mnemonic": 69
 					} )
 				} )
 				add( new FormContainer( "javax.swing.JMenu", new FormLayoutManager( class javax.swing.JMenu ) ) {
@@ -63,6 +66,7 @@ new FormModel {
 				add( new FormContainer( "javax.swing.JMenu", new FormLayoutManager( class javax.swing.JMenu ) ) {
 					name: "menu1"
 					"text": "enabled"
+					"mnemonic": 69
 				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 					"value": "cell 1 0"
 				} )
@@ -76,6 +80,7 @@ new FormModel {
 					name: "menuItem1"
 					"text": "enabled"
 					"accelerator": static javax.swing.KeyStroke getKeyStroke( 65, 130, false )
+					"mnemonic": 78
 				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 					"value": "cell 1 1"
 				} )
@@ -89,6 +94,7 @@ new FormModel {
 					name: "checkBoxMenuItem1"
 					"text": "enabled"
 					"accelerator": &KeyStroke0 static javax.swing.KeyStroke getKeyStroke( 112, 0, false )
+					"mnemonic": 65
 				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 					"value": "cell 1 2"
 				} )
@@ -102,6 +108,7 @@ new FormModel {
 					name: "radioButtonMenuItem1"
 					"text": "enabled"
 					"accelerator": #KeyStroke0
+					"mnemonic": 66
 				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 					"value": "cell 1 3"
 				} )
@@ -130,6 +137,7 @@ new FormModel {
 					name: "menu2"
 					"text": "disabled"
 					"enabled": false
+					"mnemonic": 68
 				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 					"value": "cell 0 0"
 				} )
@@ -138,6 +146,7 @@ new FormModel {
 					"text": "disabled"
 					"enabled": false
 					"accelerator": static javax.swing.KeyStroke getKeyStroke( 68, 585, false )
+					"mnemonic": 73
 				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 					"value": "cell 0 1"
 				} )
@@ -146,6 +155,7 @@ new FormModel {
 					"text": "disabled"
 					"enabled": false
 					"accelerator": #KeyStroke0
+					"mnemonic": 83
 				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 					"value": "cell 0 2"
 				} )
@@ -154,6 +164,7 @@ new FormModel {
 					"text": "disabled"
 					"enabled": false
 					"accelerator": #KeyStroke0
+					"mnemonic": 76
 				}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
 					"value": "cell 0 3"
 				} )