/* Copyright Derek Park 2001
 * All Rights Reserved
 * 
 * For terms of use:
 * http://www.gelaed.com
 */

import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.BoxLayout;
import javax.swing.Box;

import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

/**
 * A class to demonstrate the very basics of applet implementatiom
 */
public class ButtonJApplet extends JApplet 
                            implements ActionListener {
    
    // declare two buttons to instantiate later
    JButton button1, button2;
    
    /**
     * init() must be in every applet that is expected to run
     * init() is similar to the main() method in an 
     *     executable (non-applet) class
     */
    public void init() {
        
        // change the background to white instead of the default
        getContentPane().setBackground(Color.white);

        // create and use a BoxLayout so the buttons and labels are
        //     displayed in the desired order
        // without a LayoutManager such as BoxLayout, the contentPane
        //     will only display the last Component (e.g. JButton)
        //     added, and it will fill the Container fully
        getContentPane().setLayout(
                new BoxLayout(getContentPane(), BoxLayout.X_AXIS));
        
        // create boxes to hold the buttons and labels,
        //     so we can format better
        Box button1Box = new Box(BoxLayout.Y_AXIS);
        Box button2Box = new Box(BoxLayout.Y_AXIS);
        
        // add the first box to the contentPane
        getContentPane().add(button1Box);
        
        // add a 20 pixel spacer between the two boxes
        getContentPane().add(Box.createHorizontalStrut(20));
        
        // add the second box
        getContentPane().add(button2Box);
        
        // create new buttons
        button1 = new JButton("Disable Button 2");
        button2 = new JButton("Disable Button 1");
                
        // add ActionListeners to our buttons so we can "hear" when
        //     they are clicked
        button1.addActionListener(this);
        button2.addActionListener(this);
        
        // create new labels
        JLabel button1Label = new JLabel("Button 1:");
        JLabel button2Label = new JLabel("Button 2:");
        button1Label.setLabelFor(button1);
        button2Label.setLabelFor(button2);
        
        //  add the labels that we've created
        button1Box.add(button1Label);
        button1Box.add(button1);
        button2Box.add(button2Label);
        button2Box.add(button2);
    }
    
    /**
     * We Must have an actionPerformed method to find out when a
     *     button has been clicked
     */
    public void actionPerformed(ActionEvent e) {

        // we need to check to see what action was performed
        if (e.getActionCommand() == "Disable Button 2") {
            button2.setEnabled(false);
            button1.setText("Enable Button 2");
        } else if (e.getActionCommand() == "Disable Button 1") {
            button1.setEnabled(false);
            button2.setText("Enable Button 1");
        }else if (e.getActionCommand() == "Enable Button 2") {
            button2.setEnabled(true);
            button1.setText("Disable Button 2");
        } else if (e.getActionCommand() == "Enable Button 1") {
            button1.setEnabled(true);
            button2.setText("Disable Button 1");
        }
        
    }

}