package com.j2medev.chapter7;

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

public class BallMIDlet extends MIDlet implements CommandListener {
    
    private Display display = null;
    private BallCanvas canvas = null;
    
    private Command exitCommand = new Command("Exit",Command.EXIT,1);
    public void startApp() {
        if(display == null){
            display = Display.getDisplay(this);
            canvas = new BallCanvas(this);
            String mixed = System.getProperty("supports.mixing");
            if("true".equals(mixed)){
                canvas.setMixed(true);
            }else{
                canvas.setMixed(false);
            }
            canvas.addCommand(exitCommand);
            canvas.setCommandListener(this);
            new Thread(canvas).start();
            display.setCurrent(canvas);
        }
        display.setCurrent(canvas);
    }
    
    public void pauseApp() {
    }
    
    public void destroyApp(boolean unconditional) {
        if(canvas != null){
            canvas.release();
            canvas = null;
        }
    }
    
    public void commandAction(Command cmd,Displayable displayable){
        if(cmd == exitCommand){
            destroyApp(false);
            notifyDestroyed();
        }
    }
}