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// $Id: ActionUtilities.java,v 1.6 2004/08/19 19:27:20 mvw Exp $
// Copyright (c) 2003 The Regents of the University of California. All
// Rights Reserved. Permission to use, copy, modify, and distribute this
// software and its documentation without fee, and without a written
// agreement is hereby granted, provided that the above copyright notice
// and this paragraph appear in all copies.  This software program and
// documentation are copyrighted by The Regents of the University of
// California. The software program and documentation are supplied "AS
// IS", without any accompanying services from The Regents. The Regents
// does not warrant that the operation of the program will be
// uninterrupted or error-free. The end-user understands that the program
// was developed for research purposes and is advised not to rely
// exclusively on the program for any reason.  IN NO EVENT SHALL THE
// UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
// SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS,
// ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
// THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGE. THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY
// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE
// PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF
// CALIFORNIA HAS NO OBLIGATIONS TO PROVIDE MAINTENANCE, SUPPORT,
// UPDATES, ENHANCEMENTS, OR MODIFICATIONS.

/*
 * ActionUtilities.java
 */
package org.argouml.swingext;

import java.awt.Component;
import java.awt.Container;
import java.awt.event.ActionEvent;

import javax.swing.JPopupMenu;

/**
 * A collection of utility methods for Swing Actions.
 *
 * @author Eugenio Alvarez
 * @stereotype utility
 */
public class ActionUtilities {

    /**
     * Intended for use inside an actionPerformed method eg:
     * 
     *     public void actionPerformed(ActionEvent ae) {
     *         Container appRoot = ActionUtilities.getActionRoot(ae);
     *     }
     * 
* * Returns the root object, usually a JFrame, JDialog or * JApplet that is the owner of the source event source * object (JMenu, JMenuItem, JPopupMenu etc). * * @param ae the given action event * @return the root object */ public static Container getActionRoot(ActionEvent ae) { return ActionUtilities.getActionRoot(ae.getSource()); } // getActionRoot() /** * Intended for use inside an actionPerformed method eg: *
     *     public void actionPerformed(ActionEvent e) {
     *         Container appRoot = ActionUtilities.getActionRoot(e.getSource());
     *     }
     * 
* @return the root object, usually a JFrame, JDialog or JApplet * that is the owner of the source event source object * (JMenu, JMenuItem, JPopupMenu etc). * null if none is found. * * @param source the source of the event */ public static Container getActionRoot(Object source) { Container container = null; if (source instanceof Component) { Component component = (Component) source; container = ActionUtilities.getContainer(component); if (container == null) { if (source instanceof Container) { return (Container) source; } // end if return null; } // end if while (ActionUtilities.getContainer(container) != null) { container = ActionUtilities.getContainer(container); } // end while } // end if return container; } // end getActionRoot() /** * Helper method to find the Container of * Component. */ private static Container getContainer(Component source) { Container container = source.getParent(); if (container != null) { return container; } if (source instanceof JPopupMenu) { JPopupMenu jPopupMenu = (JPopupMenu) source; Component component = jPopupMenu.getInvoker(); if (component instanceof Container) { container = (Container) component; } // end if } // end if return container; } // end getContainer() } // end class ActionUtilities
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