package rebelsky.swing;

import java.awt.Container;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

/**
 * A fairly simple sample Swing program to illustrate one method of
 * listening to buttons.  In this case, we use the "master" class
 * as our listener.
 * 
 * @author Samuel A. Rebelsky
 * @version 1.0 of October 2004
 */
public class ButtonsTwo 
    extends JFrame
    implements ActionListener
{
    /** All the buttons in the program. */
    JButton[] buttons;

    /** The number of buttons in the program. */
    int numButtons;

    private ButtonsTwo(String _title, int width, int height)
    {
        super(_title);

        //Make sure we have nice window decorations.
        JFrame.setDefaultLookAndFeelDecorated(true);

        // Exit nicely when closing
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        // Get the useful part of this frame.
        Container pane = this.getContentPane();
        pane.setLayout(new GridLayout(width,height));

        // Build and add the buttons
        this.numButtons = width*height;
        buttons = new JButton[this.numButtons];
        for (int h = 0; h < height; h++) {
            for (int w = 0; w < width; w++) {
                int pos = h*width + w;
                buttons[pos] = new JButton(Integer.toString(pos));
                buttons[pos].addActionListener(this);
                pane.add(buttons[pos]);
            } // inner for
        } // outer for

        //Display the window.
        this.pack();
        this.setVisible(true);
    } // ButtonsTwo(String)

    public void actionPerformed(ActionEvent ae) {
       JButton b = (JButton) ae.getSource();
       JButton target =
           buttons[(Integer.parseInt(b.getText()) + 2) % numButtons];
       target.setText(Integer.toString((Integer.parseInt(target.getText()) + Integer.parseInt(b.getText())) % numButtons));
    } // actionPerformed(ae)
    
    public static void main(String[] args) {
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new ButtonsTwo("3x2", 3, 2);
                new ButtonsTwo("4x1", 4, 1);
            }
        });
    } // main(String[])
} // class ButtonsTwo