samer@0: /*
samer@0:  *	DynamicPopupHandler.java	
samer@0:  *
samer@0:  *	Copyright (c) 2003, Samer Abdallah, King's College London.
samer@0:  *	All rights reserved.
samer@0:  *
samer@0:  *	This software is provided AS iS and WITHOUT ANY WARRANTY; 
samer@0:  *	without even the implied warranty of MERCHANTABILITY or 
samer@0:  *	FITNESS FOR A PARTICULAR PURPOSE.
samer@0:  */
samer@0: 
samer@0: package samer.core.util.swing;
samer@0: import  samer.core.*;
samer@0: import  samer.core.util.*;
samer@0: import  java.awt.event.*;
samer@0: import  javax.swing.*;
samer@0: 
samer@0: /** This is a mouse click handler that builds a popup menu on
samer@0: 	the fly from a list of Agents (actually, just one, possibly
samer@0: 	compound agent.) The Agent can be changed so that
samer@0: 	new menu items can be added.
samer@0: */
samer@0: 
samer@0: public class DynamicPopupHandler extends MouseAdapter
samer@0: {
samer@0: 	private String			name;
samer@0: 	private boolean			backstop;
samer@0: 	private AgentAdapter	adapter=null;
samer@0: 
samer@0: 	public DynamicPopupHandler(String nm) { name=nm; }
samer@0: 		
samer@0: 	public void addAgent(Agent agent) {
samer@0: 		adapter=new AgentAdapter( adapter==null ? agent
samer@0: 			: new CompoundAgent(adapter.getAgent(),agent));
samer@0: 	}
samer@0: 	
samer@0: 	public void setBackstop(boolean f) { backstop=f; }
samer@0: 	public void mousePressed( MouseEvent e) { maybeShowMenu(e); }
samer@0: 	public void mouseReleased( MouseEvent e) { maybeShowMenu(e); }
samer@0: 
samer@0: 	void maybeShowMenu(MouseEvent e)
samer@0: 	{
samer@0: 		if (!e.isPopupTrigger()) return;		
samer@0: 		if (!backstop) {
samer@0: 			// if not backstop, must NOT have Alt or Ctl down
samer@0: 			// modified for Macs: need modifiers to get right mouse click!
samer@0: 			if (e.isShiftDown()) return; 
samer@0: 		}
samer@0: 		JPopupMenu popup=new JPopupMenu(name);
samer@0: 		adapter.getAgent().getCommands(new MenuBuilder(popup,adapter));
samer@0: 		popup.show( e.getComponent(), e.getX(), e.getY());
samer@0: 		e.consume();
samer@0: 	}
samer@0: }