https://openjdk.java.net/ 
/*
 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package javax.swing;

import java.awt.*;
import java.awt.event.*;


Any component that can be placed into a menu should implement this interface. This interface is used by MenuSelectionManager to handle selection and navigation in menu hierarchies. 
Author:Arnaud Weber
Since:1.2
/**
 * Any component that can be placed into a menu should implement this interface.
 * This interface is used by {@code MenuSelectionManager}
 * to handle selection and navigation in menu hierarchies.
 *
 * @author Arnaud Weber
 * @since 1.2
 */

public interface MenuElement {

    
Processes a mouse event. event is a MouseEvent with source being the receiving element's component. path is the path of the receiving element in the menu hierarchy including the receiving element itself. manager is the MenuSelectionManagerfor the menu hierarchy. This method should process the MouseEvent and change the menu selection if necessary by using MenuSelectionManager's API Note: you do not have to forward the event to sub-components. This is done automatically by the MenuSelectionManager. 
Params:
  • event – a MouseEvent to be processed
  • path – the path of the receiving element in the menu hierarchy
  • manager – the MenuSelectionManager for the menu hierarchy
/**
     * Processes a mouse event. {@code event} is a {@code MouseEvent} with
     * source being the receiving element's component. {@code path} is the
     * path of the receiving element in the menu hierarchy including the
     * receiving element itself. {@code manager} is the
     * {@code MenuSelectionManager}for the menu hierarchy. This method should
     * process the {@code MouseEvent} and change the menu selection if necessary
     * by using {@code MenuSelectionManager}'s API Note: you do not have to
     * forward the event to sub-components. This is done automatically by the
     * {@code MenuSelectionManager}.
     *
     * @param event a {@code MouseEvent} to be processed
     * @param path the path of the receiving element in the menu hierarchy
     * @param manager the {@code MenuSelectionManager} for the menu hierarchy
     */
    public void processMouseEvent(MouseEvent event, MenuElement path[], MenuSelectionManager manager);


    
 Process a key event.

Params:
  • event – a KeyEvent to be processed
  • path – the path of the receiving element in the menu hierarchy
  • manager – the MenuSelectionManager for the menu hierarchy
/**
     *  Process a key event.
     *
     * @param event a {@code KeyEvent} to be processed
     * @param path the path of the receiving element in the menu hierarchy
     * @param manager the {@code MenuSelectionManager} for the menu hierarchy
     */
    public void processKeyEvent(KeyEvent event, MenuElement path[], MenuSelectionManager manager);

    
Call by the MenuSelectionManager when the MenuElement is added or removed from the menu selection. 
Params:
  • isIncluded – can be used to indicate if this MenuElement is active (if it is a menu) or is on the part of the menu path that changed (if it is a menu item).
/**
     * Call by the {@code MenuSelectionManager} when the {@code MenuElement} is
     * added or removed from the menu selection.
     *
     * @param isIncluded can be used to indicate if this {@code MenuElement} is
     *        active (if it is a menu) or is on the part of the menu path that
     *        changed (if it is a menu item).
     */
    public void menuSelectionChanged(boolean isIncluded);

    
This method should return an array containing the sub-elements for the
receiving menu element.

Returns:an array of MenuElements
/**
     * This method should return an array containing the sub-elements for the
     * receiving menu element.
     *
     * @return an array of {@code MenuElement}s
     */
    public MenuElement[] getSubElements();

    
This method should return the java.awt.Component used to paint the receiving element. The returned component will be used to convert events and detect if an event is inside a MenuElement's component. 
Returns:the Component value
/**
     * This method should return the {@code java.awt.Component} used to paint the
     * receiving element. The returned component will be used to convert events
     * and detect if an event is inside a {@code MenuElement}'s component.
     *
     * @return the {@code Component} value
     */
    public Component getComponent();
}