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.  Based loosely
 * on the program found at
 *    http://java.sun.com/docs/books/tutorial/uiswing/learn/example-1dot4/HelloWorldSwing.java
 * 
 * @author Samuel A. Rebelsky
 * @version 1.0 of October 2004
 */
public class HelloFrame 
    extends JFrame
{
    /** The message shown in the one label in this application. */
    String message;

    private HelloFrame(String _message)
    {
	super(_message);
        this.message = _message;
        //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 framme.
	Container pane = this.getContentPane();
	pane.setLayout(new GridLayout(0,1));

        //Add the specified label
        final JLabel label = new JLabel(this.message);
        pane.add(label);
	
	// Add a button
	JButton click = new JButton("Click Me!");
	click.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent ae) {
		if (label.getText().equals("Click")) {
	            label.setText(message);
		}
		else {
		    label.setText("Click");
		}
	    }
	});
	pane.add(click);

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

    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 HelloFrame("Hello");
                new HelloFrame("Goodbye");
            }
        });
    } // main(String[])
} // class HelloFrame