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.swing;
samer@0: import	samer.core.util.*;
samer@0: import	samer.core.*;
samer@0: import	javax.swing.*;
samer@0: import	java.awt.*;
samer@0: import	java.awt.event.*;
samer@0: 
samer@0: /** Basically a Viewer implemented as a bare JComponent.
samer@0: 	Calls attach() on addNotify(). Also calls realized();
samer@0: 	Calls sized() when sized.
samer@0: 	Keeps track of its own width and height.
samer@0: 	Can display popup menu.
samer@0:  */
samer@0: 
samer@0: public class VCanvas extends JComponent implements Viewer
samer@0: {
samer@0: 	public int		 width, height;
samer@0: 
samer@0: 	public VCanvas()
samer@0: 	{
samer@0: 		addMouseListener(MouseRetarget.listener);
samer@0: 		addComponentListener( new ComponentAdapter() {
samer@0: 			public void componentResized(ComponentEvent e) {
samer@0: 				width=getWidth(); height=getHeight();
samer@0: 				sized();
samer@0: 			}
samer@0: 		} );
samer@0: 
samer@0: 		setBackground(Shell.getColor("background",null));
samer@0: 		setForeground(Shell.getColor("foreground",null));
samer@0: 		setOpaque(true);
samer@0: 	}
samer@0: 
samer@0: 	protected void realized() {}
samer@0: 	protected void sized() {}
samer@0: 
samer@0: 	protected void paintComponent(Graphics g) { clear(g); }
samer@0: 	public void clear(Graphics g) {
samer@0: 		g.setColor(getBackground());
samer@0: 		g.fillRect(0,0,width,height);
samer@0: 	}
samer@0: 
samer@0: 	public void removeNotify() { detach(); super.removeNotify(); }
samer@0: 	public void addNotify() {
samer@0: 		super.addNotify();
samer@0: 		width=getWidth(); height=getHeight();
samer@0: 		attach(); realized(); // ??
samer@0: 	}
samer@0: 
samer@0: 	public Dimension getMinimumSize() { return new Dimension(0,0); }
samer@0: 
samer@0: 	// ....... MenuAnchor bits .......................
samer@0: 
samer@0: 	public Component	getComponent() { return this; }
samer@0: 	public void	attach() {} 
samer@0: 	public void	detach() {}
samer@0: 
samer@0: 	// private javax.swing.JPopupMenu	menu=null;
samer@0: 	private DynamicPopupHandler	popup=null;
samer@0: 	
samer@0: 	public void	exposeCommands(Agent agent) {
samer@0: 		popup=MenuBuilder.showCommands(agent,this,popup);
samer@0: 		// menu=MenuBuilder.showCommands(agent,getComponent(),menu);
samer@0: 	}
samer@0: }
samer@0: 
samer@0: