samer@0: /*
samer@0:  *	PopupHandler.java	
samer@0:  *
samer@0:  *	Copyright (c) 2000, 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.heavy;
samer@0: import  java.awt.*;
samer@0: import  java.awt.event.*;
samer@0: 
samer@0: public class PopupHandler extends MouseAdapter
samer@0: {
samer@0: 	private PopupMenu	popup;
samer@0: 	private boolean	backstop;
samer@0: 
samer@0: 	public PopupHandler(PopupMenu p) { this(p,false); }	
samer@0: 	public PopupHandler(PopupMenu p, boolean bs) { popup=p; backstop=bs; }	
samer@0: 
samer@0: 	public void mousePressed( MouseEvent e)
samer@0: 	{
samer@0: 		if (isTrigger(e)) { 
samer@0: 			popup.show( e.getComponent(), e.getX(), e.getY());
samer@0: 			e.consume();
samer@0: 		}
samer@0: 		// could pass directly on to dispatcher here
samer@0: 	}
samer@0: 	public void mouseReleased( MouseEvent e)
samer@0: 	{
samer@0: 		if (isTrigger(e)) { 
samer@0: 			popup.show( e.getComponent(), e.getX(), e.getY());
samer@0: 			e.consume();
samer@0: 		}
samer@0: 		// could pass directly on to dispatcher here
samer@0: 	}
samer@0: 
samer@0: 	boolean isTrigger(MouseEvent e)
samer@0: 	{
samer@0: 		if (!e.isPopupTrigger()) return false;		
samer@0: 
samer@0: 		// firstly, must have button 2 or 3 down
samer@0: 		// if ( (f & (InputEvent.BUTTON3_MASK|InputEvent.BUTTON2_MASK))==0 ) return false; 
samer@0: 
samer@0: 		// next, if Popup is backstop menu, definitely show it
samer@0: 		if (backstop) return true; 
samer@0: 
samer@0: 		// otherwise, must NOT have Alt or Ctl down
samer@0: 		if (e.isShiftDown() || e.isControlDown()) return false; 
samer@0: 		return true;
samer@0: 	}
samer@0: }