//------------------------------- NOTES --------------------------------
/*
    The EventTest applet from pages 245-6 of the text.
    
    NOTE: We should warn you that when running this program you shouldn't be
    surprised if some of the events are not reported.  As of this writing,
    it's still a sad fact of life that some Java environments aren't as diligent
    as they should be in generating and catching events. 
*/

//------------------------------ IMPORTS -------------------------------

import java.awt.*;
import java.awt.event.*;
import java.applet.*;

public class ET extends Applet
{
    private Button left, right;
    private Display myDisplay;
    
    public void init()
    {
    	setLayout(new BorderLayout());
    	myDisplay = new Display();
    	add("Center", myDisplay);
    	
    	Panel p = new Panel();
    	left = new Button("Left");
    	p.add(left);
    	right = new Button("Right");
    	p.add(right);
    	add("South", p);
    	
    	left.addActionListener(myDisplay);
        right.addActionListener(myDisplay);
        
    }
	
}

class Display extends Canvas implements ActionListener
{
	private Point center;
	
	public Display()
	{
		center = new Point(50, 50);
		setBackground(Color.white);
	}
	
	public void actionPerformed(ActionEvent e)
	{
		String direction = e.getActionCommand();
		if (direction.equals("Left"))
			center.x -= 12;
		else if (direction.equals("Right"))
			center.x += 12;
		repaint();
	}
	
	public void paint(Graphics g)
	{
		g.setColor(Color.red);
		g.fillOval(center.x - 5, center.y - 5, 10, 10);
	}
}