The Java Developers Almanac 1.4

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e815. Listening for Changes to the Currently Selected Menu or Menu Item

The currently selected menu or menu item in a JMenu or JPopupMenu is tracked by MenuSelectionManager. To receive notification of changes to the currently selected menu or menu item, a change listener must be registered with the MenuSelectionManager.

    // Create a change listener and register with the menu selection manager
    MenuSelectionManager.defaultManager().addChangeListener(
        new ChangeListener() {
            public void stateChanged(ChangeEvent evt) {
                // Get the selected menu or menu item
                MenuSelectionManager msm = (MenuSelectionManager)evt.getSource();
                MenuElement[] path = msm.getSelectedPath();
                // To interpret path, see
                // e813 Getting the Currently Selected Menu or Menu Item
    
                if (path.length == 0) {
                    // All menus are hidden
                }
            }
        }
    );

Related Examples

e808. Creating a JMenuBar, JMenu, and JMenuItem Component
e809. Separating Menu Items in a Menu
e810. Creating a Popup Menu
e811. Creating a Popup Menu with Nested Menus
e812. Forcing a Popup Menu to Be a Heavyweight Component
e813. Getting the Currently Selected Menu or Menu Item
e814. Creating a Menu Item That Listens for Changes to Its Selection Status

See also: Actions JButton JCheckBox JComboBox JDesktop and JInternalFrame JFrame, JWindow, JDialog JLabel JList JProgressBar JRadioButton JScrollPane JSlider JSpinner JSplitPane JTabbedPane JToolBar Keystrokes and Input Maps Layout Look and Feel Progress Monitor The Screen Tool Tips UI Default Values

© 2002 Addison-Wesley.