content: //  Copyright 2006, Clark N. Hobbie
  //
  //  This file is part of the util library.
  //
  //  The util library is free software; you can redistribute it and/or modify it
  //  under the terms of the Lesser GNU General Public License as published by
  //  the Free Software Foundation; either version 2.1 of the License, or (at
  //  your option) any later version.
  //
  //  The util library 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 Lesser GNU General Public
  //  License for more details.
  //
  //  You should have received a copy of the Lesser GNU General Public License
  //  along with the util library; if not, write to the Free Software Foundation,
  //  Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  //
  package com.lts.swing.menu;
  
  import java.awt.Component;
  import java.awt.event.MouseAdapter;
  import java.awt.event.MouseEvent;
  
  import javax.swing.JPopupMenu;
  
  /**
   * A class that simplifies the use of popup menus by combining a popup with 
   * a mouse listener.
   * 
   * <H2>Examples</H2>
   * <CODE>
   * <PRE>
   * JTable table;
   * JPopupMenu popup;
   * ...
   * PopupMouseListener pml = new PopupMouseListener(popup);
   * table.addMouseListener(pml);
   * </PRE>
   * </CODE>
   * 
   * <P/>
   * The JPopupMenu described by popup will now be triggered while the 
   * appropriate mouse button is pressed or released.
   */
  public class PopupMouseListener extends MouseAdapter
  {
  	protected JPopupMenu myPopup;
  	
  	public PopupMouseListener (JPopupMenu popup)
  	{
  		myPopup = popup;
  	}
  	
  	
  	public void showPopup (Component source, int x, int y)
  	{
  		if (null == source)
  			return;
  
  		myPopup.show(source, x, y);
  	}
  	
  	public void maybeShowPopup(MouseEvent e) 
  	{
  		if (e.isPopupTrigger()) 
  		{
  			Component c = (Component) e.getSource();
  			showPopup (c, e.getX(), e.getY());
  		}
  	}
  	
  
  	public void mousePressed(MouseEvent e) 
  	{
  		maybeShowPopup(e);
  	}
  
  	public void mouseReleased(MouseEvent e) 
  	{
  		maybeShowPopup(e);
  	}
  }
  