comparison src/samer/core_/util/swing/VCanvas.java @ 0:bf79fb79ee13

Initial Mercurial check in.

+/*
+ *	Copyright (c) 2000, Samer Abdallah, King's College London.
+ *	All rights reserved.
+ *
+ *	This software is provided AS iS and WITHOUT ANY WARRANTY; 
+ *	without even the implied warranty of MERCHANTABILITY or 
+ *	FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+package	samer.core.util.swing;
+import	samer.core.util.*;
+import	samer.core.*;
+import	javax.swing.*;
+import	java.awt.*;
+import	java.awt.event.*;
+
+/** Basically a Viewer implemented as a bare JComponent.
+	Calls attach() on addNotify(). Also calls realized();
+	Calls sized() when sized.
+	Keeps track of its own width and height.
+	Can display popup menu.
+ */
+
+public class VCanvas extends JComponent implements Viewer
+{
+	public int		 width, height;
+
+	public VCanvas()
+	{
+		addMouseListener(MouseRetarget.listener);
+		addComponentListener( new ComponentAdapter() {
+			public void componentResized(ComponentEvent e) {
+				width=getWidth(); height=getHeight();
+				sized();
+			}
+		} );
+
+		setBackground(Shell.getColor("background",null));
+		setForeground(Shell.getColor("foreground",null));
+		setOpaque(true);
+	}
+
+	protected void realized() {}
+	protected void sized() {}
+
+	protected void paintComponent(Graphics g) { clear(g); }
+	public void clear(Graphics g) {
+		g.setColor(getBackground());
+		g.fillRect(0,0,width,height);
+	}
+
+	public void removeNotify() { detach(); super.removeNotify(); }
+	public void addNotify() {
+		super.addNotify();
+		width=getWidth(); height=getHeight();
+		attach(); realized(); // ??
+	}
+
+	public Dimension getMinimumSize() { return new Dimension(0,0); }
+
+	// ....... MenuAnchor bits .......................
+
+	public Component	getComponent() { return this; }
+	public void	attach() {} 
+	public void	detach() {}
+
+	// private javax.swing.JPopupMenu	menu=null;
+	private DynamicPopupHandler	popup=null;
+	
+	public void	exposeCommands(Agent agent) {
+		popup=MenuBuilder.showCommands(agent,this,popup);
+		// menu=MenuBuilder.showCommands(agent,getComponent(),menu);
+	}
+}
+
+