code: //==============================================================================
  //	
  //	Copyright (c) 2002-
  //	Authors:
  //	* Andrew Hinton <ug60axh@cs.bham.ac.uk> (University of Birmingham)
  //	* Dave Parker <david.parker@comlab.ox.ac.uk> (University of Oxford, formerly University of Birmingham)
  //	
  //------------------------------------------------------------------------------
  //	
  //	This file is part of PRISM.
  //	
  //	PRISM is free software; you can redistribute it and/or modify
  //	it under the terms of the GNU General Public License as published by
  //	the Free Software Foundation; either version 2 of the License, or
  //	(at your option) any later version.
  //	
  //	PRISM 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 for more details.
  //	
  //	You should have received a copy of the GNU General Public License
  //	along with PRISM; if not, write to the Free Software Foundation,
  //	Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  //	
  //==============================================================================
  
  package userinterface.util;
  import java.util.*;
  import userinterface.*;
  
  public class GUIEventHandler
  {
  	public GUIPrism gui;
  	public ArrayList<GUIEventListener> listeners;
  	
  	/** Creates a new instance of GUIEventHandler */
  	public GUIEventHandler(GUIPrism gui)
  	{
  		this.gui = gui;
  		listeners = new ArrayList<GUIEventListener>();
  	}
  	
  	public void addListener(GUIEventListener listen)
  	{
  		listeners.add(listen);
  	}
  	
  	public void notifyListeners(GUIEvent e)
  	{
  		boolean res = false;
  		// notify plugins
  		for(int i = 0; i < listeners.size(); i++)
  		{
  			GUIEventListener lis = listeners.get(i);
  			res = lis.processGUIEvent(e);
  			if (res) break;
  		}
  		// notify gui itself
  		if (gui != null && !res) gui.processGUIEvent(e);
  	}
  	
  	public boolean removeListener(GUIEventListener listen)
  	{
  		return listeners.remove(listen);
  	}
  	
  	public void clear()
  	{
  		listeners.clear();
  	}
  }
  