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  javax.swing.*;
samer@0: import  java.awt.*;
samer@0: import  java.awt.event.*;
samer@0: 
samer@0: public class LED extends JComponent
samer@0: {
samer@0: 	boolean state=false;
samer@0: 	
samer@0: 	public LED(Color fg) { this(fg,fg.darker().darker()); }
samer@0: 	public LED(Color fg, Color bg) { this(); setBackground(bg); setForeground(fg);	}
samer@0: 	public LED() {}
samer@0: 	
samer@0: 	public void update(Graphics g) { paint(g); }
samer@0: 	public void paint(Graphics g) {
samer@0: 		g.setColor( state ? getForeground() : getBackground());
samer@0: 		g.fillRect(0,0,getWidth(),getHeight());
samer@0: 	}
samer@0: 
samer@0: 	public final void on() { set(true); }
samer@0: 	public final void off() { set(false); }
samer@0: 	public final void set( boolean state) { 
samer@0: 		if (state!=this.state) { this.state=state; repaint(); }
samer@0: 	}
samer@0: 
samer@0: 	public Dimension getPreferredSize() { return new Dimension(8,8); }
samer@0: }