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The Java Developers Almanac 1.4Order this book from Amazon. |
e815. Listening for Changes to the Currently Selected Menu or Menu ItemThe currently selected menu or menu item in aJMenu 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 } } } );
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 © 2002 Addison-Wesley. |