//------------
// Introduction to Programming Using Java: An Object-Oriented Approach
//Arnow/Weiss
//------------
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class LifeApplet extends Applet implements ActionListener{
    public void init() {
        setLayout(new BorderLayout());
        lifeDisplay = new LifeDisplay();
        add("Center", lifeDisplay);
        Panel p = new Panel();
        add("South", p);
        startButton = new Button("Start");
        startButton.addActionListener(this);
        p.add(startButton);
        startButton.setEnabled(true);
        pauseButton = new Button("Pause");
        pauseButton.addActionListener(this);
        p.add(pauseButton);
        pauseButton.setEnabled(false);
        resetButton = new Button("Reset");
        resetButton.addActionListener(this);
        p.add(resetButton);
        resetButton.setEnabled(false);
        stopButton = new Button("Stop");
        stopButton.addActionListener(this);
        p.add(stopButton);
        setBackground(new Color(255, 20, 90));
        startButton.setEnabled(true);
        pauseButton.setEnabled(false);
        resetButton.setEnabled(false);
        stopButton.setEnabled(false);
        startButton = new Button("Start");
        startButton.addActionListener(this);
        p.add(startButton);
        startButton.setEnabled(true);
        pauseButton = new Button("Pause");
        pauseButton.addActionListener(this);
        p.add(pauseButton);
        pauseButton.setEnabled(false);
        resetButton = new Button("Reset");
        resetButton.addActionListener(this);
        p.add(resetButton);
        resetButton.setEnabled(false);
        stopButton = new Button("Stop");
        stopButton.addActionListener(this);
        p.add(stopButton);
        setBackground(new Color(255, 20, 90));
        startButton.setEnabled(true);
        pauseButton.setEnabled(false);
        resetButton.setEnabled(false);
        stopButton.setEnabled(false);
    }
    public void actionPerformed(ActionEvent ae) {
        String whichButton = ae.getActionCommand();
        if (whichButton.equals("Start"))
           handleStart();
        else if (whichButton.equals("resume"))
           handleResume();
        else if (whichButton.equals("Pause"))
           handlePause();
        else if (whichButton.equals("Reset"))
           handleReset();
        else if (whichButton.equals("Stop"))
           handleStop();
    }
    private void handleStart() {
        startButton.setLabel("resume");
        lifeThread = new LifeThread(lifeDisplay, 80);
        lifeThread.start();
        startButton.setEnabled(false);
        pauseButton.setEnabled(true);
        resetButton.setEnabled(true);
        stopButton.setEnabled(true);
    }
    private void handleResume() {
        lifeThread.ourResume();
        startButton.setEnabled(false);
        pauseButton.setEnabled(true);
        resetButton.setEnabled(true);
        stopButton.setEnabled(true);
    }
    private void handlePause() {
        lifeThread.ourSuspend();
        startButton.setEnabled(true);
        pauseButton.setEnabled(false);
        resetButton.setEnabled(true);
        stopButton.setEnabled(true);
    }
    private void handleReset() {
        lifeThread.ourStop();
        handleStart();
    }
    private void handleStop() {
        lifeThread.ourStop();
        startButton.setEnabled(false);
        pauseButton.setEnabled(false);
        resetButton.setEnabled(false);
        stopButton.setEnabled(false);
    }
    private LifeDisplay    lifeDisplay;
    private LifeThread     lifeThread;
    private Button         startButton, pauseButton,
                                   resetButton, stopButton;
}