DynamicMenuAction.java

/*
 * Copyright 2009-2012 Amazon Technologies, Inc. 
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); 
 * you may not use this file except in compliance with the License. 
 * You may obtain a copy of the License at:
 * 
 *    http://aws.amazon.com/apache2.0
 *
 * This file is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES 
 * OR CONDITIONS OF ANY KIND, either express or implied. See the 
 * License for the specific language governing permissions and 
 * limitations under the License. 
 */

package com.amazonaws.eclipse.ec2.utils;

import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Menu;

/**
 * Action class to create dynamic Menu objects. The menu is created everytime
 * the widget is invoked, enabling the menu to be re-populated with fresh data
 */
public class DynamicMenuAction extends MenuAction {

	/**
	 * Constructor
	 * 
	 * @param text
	 *            Text that gets displayed on the Menu
	 * @param toolTip
	 *            Tooltip that gets displayed for the menu
	 * @param imageDescriptor
	 *            The icon used for the menu
	 * @param menuHandler
	 *            The MenuHandler object used to manage actions
	 */
	public DynamicMenuAction(String text, String toolTip, 
				String imageDescriptor, MenuHandler dropdownMenuHandler) {
		super(text, toolTip, imageDescriptor, dropdownMenuHandler);
	}

	/**
	 * If there is already a menu from previous, dispose it for being able to
	 * create a fresh one
	 * 
	 * @see com.amazonaws.eclipse.ec2.utils.MenuAction#getMenu(Menu parent)
	 */
	@Override 
	public Menu getMenu(Control parent) {
        if (menu != null) {
            menu.dispose();
        }
        
        return constructMenu(parent);
	}
}