/* MultipleEvents3.java
 *
 * This program illustrates one way to handle multiple events in a single program - by
 * having a different listener for each event source.  The listeners are instances of
 * an inner class named ColorChangeListener.  Each instance is told what color to
 * change to when it is constructed, and stores this value for use by the
 * actionPerformed() method. The GUI consists of a window that can be drawn in one of
 * three colors, and three buttons that can be used to change the color
 *
 * Copyright (c) 2000, 2004 - Russell C. Bjork
 */
 
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class MultipleEvents3 extends JFrame
{
	// Constructor - create the GUI
	
	public MultipleEvents3()
    { 
        super("MultipleEvents Demo #3");
      	setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		// Add the buttons - in their own panel

        JPanel buttonPanel = new JPanel();
        JButton redButton = new JButton("Red");
        redButton.addActionListener(new colorChangeListener(Color.red));
        buttonPanel.add(redButton);
        JButton greenButton = new JButton("Green");
        greenButton.addActionListener(new colorChangeListener(Color.green));
        buttonPanel.add(greenButton);
        JButton blueButton = new JButton("Blue");
        blueButton.addActionListener(new colorChangeListener(Color.blue));
        buttonPanel.add(blueButton);
        getContentPane().add(buttonPanel, BorderLayout.SOUTH);
        
        setSize(300, 200);
    }
    
    // Objects of this inner class serve as the event listeners
    
    private class colorChangeListener implements ActionListener
    {
      	colorChangeListener(Color changeTo)
      	{
      	    this.changeTo = changeTo;
      	}
	    public void actionPerformed(ActionEvent event)
	    { 
	      	getContentPane().setBackground(changeTo);
	      	repaint();
	    }
	    private Color changeTo;
	}
    
    // Main program - Create the GUI and let it do the work 

    public static void main(String [] args)
    {
    	new MultipleEvents3().setVisible(true);
   	}
}