/**
 * Computer Graphics, Assignment 1, Exercise 3
 * Richard Cyganiak
 *
 * The applet shows a button labeled "Open window".
 * Clicking the button opens a new window with some text.
**/
import java.awt.*;
import java.awt.event.*;

public class SimpleWindowApplet extends java.applet.Applet
{
    /**
     * The applet initialisation method. It just adds a button.
    **/
    public void init()
    {
        Button b = new Button("Open window");
        b.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e)
            {
                if (e.getActionCommand().equals("Open window")) {
                    openWindow();
                }
            }
        });
        add(b);
    }
    
    /**
     * Executed when the button is pressed. Opens a new window,
     * which contains a label and can be closed.
    **/
    private void openWindow()
    {
        final Frame f = new Frame("Simple Demo Window");
        f.setLayout(new FlowLayout());
        f.add(new Label("I am a window."));
        f.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e)
            {
                f.dispose();
            }
        });
        f.pack();
        f.show();
    }
}