/**
 * TypeableWindow illustrates the KeyListener interface.
 * 
 * 0. Run the TypeableWindowTester.  Type r, g, b, or any other key that
 * you care to type.  What happens?
 * 
 * 1. Note that TypeableWindow is a subclass of MainWindow, just as
 * PaintedWindow is.  That means that you can have a paint method.
 * Take a look at the constructor.  Does it call the MainWindow constructor
 * to set the window title?  (Hint: no.)  What does it do instead?
 * 
 * 2. TypeableWindow "implements" the "KeyListener interface."  This is
 * a lot like being a subclass of a class, but it's a bit different.  The
 * most important thing to remember about interfaces is that they *require*
 * you to write a particular collection of methods.  The KeyListener, for
 * example, requires you to write the keyTyped, keyPressed, and keyReleased
 * methods, even if they don't do anything at all.
 * 
 * 3. What's the difference between keyTyped, keyPressed, and keyReleased?
 * Move the code out of keyTyped and into keyReleased and re-run the program.
 * How does the behavior of the program change?  Now move it to keyPressed.
 * What happens?
 * 
 * 4. Take a look at Sun's documentation on the KeyListener interface.  (Note
 * that in the list of classes, KeyListener is italicized--that's because it's
 * an interface and not a class.)  What does the documentation say about the
 * difference between keyPressed and keyTyped?
 * 
 * 5. There's a "switch" statement in keyTyped.  What does this statement do?
 * When you get the chance, you should read in your textbook about switch statements.
 * 
 * @author Jeff Ondich
 * @version 1/31/03
 */

import java.awt.*;
import java.awt.event.*;
import javabook.*;

public class TypeableWindow
				extends MainWindow
				implements KeyListener
{
	private Color color;

	public TypeableWindow( String title )
	{
		// Arrange for mouse events to be sent to this window.
        addKeyListener( this );

		// Initialize the window.
        setSize( 500, 600 );
        setLocation( 520, 20 );
		setTitle( title );
		setBackground( Color.white );
		toFront();
		setVisible( true );
	}

	public void paint( Graphics g )
	{
		Rectangle	r = getBounds();
		g.setColor( color );
		g.fillOval( r.width / 4, r.height / 4, r.width / 2, r.height / 2 );
	}

	public void keyTyped( KeyEvent e )
	{
		switch( e.getKeyChar() )
		{
		case 'r':
			color = Color.red;
			break;
			
		case 'b':
			color = Color.blue;
			break;

		default:
			color = Color.green;
			break;
		}

		repaint();
	}

	public void keyPressed( KeyEvent e )
	{
	}

	public void keyReleased( KeyEvent e )
	{
	}
}