import greenfoot.*;  // (World, Actor, GreenfootImage, and Greenfoot)

public class Key extends Actor
{
    /**
     * Create a new key.
     */
    private String key;
    private String sound;
    private String blackKey;
    private String keyType;
    private String sound2;
    
    public Key(String keyName, String soundFile, String keyType, String toggle){
            key = keyName;
            sound = soundFile;
            blackKey = keyType;
            sound2 = toggle;
            if(blackKey.equals("black")) {
                setImage("black-key.png");
            }
    }
    private boolean isDown;
    private boolean isDown2;
    private void playSound() {
        if(toggle.toggled != true) {
            Greenfoot.playSound(sound);
        } else {
            Greenfoot.playSound(sound2);
        }
    }
    public void animateKey() {
        if(!blackKey.equals("black")){
        if(!isDown && Greenfoot.isKeyDown(key)){
            setImage("white-key-down.png");
            isDown = true;
            playSound();
        }
        if(isDown && !Greenfoot.isKeyDown(key)){
            setImage("white-key.png");
            isDown = false;
        }
    }else{
        if(!isDown2 && Greenfoot.isKeyDown(key)){
            setImage("black-key-down.png");
            isDown2 = true;
            playSound();
        }
        if(isDown2 && !Greenfoot.isKeyDown(key)){
            setImage("black-key.png");
            isDown2 = false;
        }
    }
    }
     public void act()  {
        animateKey();
    }
}

import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)

/**
 * Write a description of class toggle here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class toggle extends Actor
{
    /**
     * Act - do whatever the toggle wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    public void act() 
    {
        toggle();
    }    
    public static boolean toggled;
    public void toggle() {
        if(Greenfoot.isKeyDown("1") && toggled != true) {
            toggled = true;
            setImage("button-green.png");
        } 
        if(Greenfoot.isKeyDown("2") && toggled == true){
          toggled = false;
          setImage("button-red.png");
        }
    }
}

import greenfoot.*;  // (World, Actor, GreenfootImage, and Greenfoot)

/**
 * A piano that can be played with the computer keyboard.
 * 
 * @author: M. Kolling
 * @version: 0.1
 */
public class Piano extends World
{
    /**
     * Make the piano.
     */
    public Piano() 
    {
        super(800, 340, 1);
        displayKeys();
        addObject( new toggle(), 761, 313);
    }
    //toggled
    //white keys
    public String[] toggledWhite = {"a.mp3", "b.mp3", "c.mp3", "d.mp3", "e.mp3", "f.mp3", "g.mp3", "h.mp3", "i.mp3", "j.mp3", "k.mp3", "l.mp3"};
    public String[] toggledBlack = {"1.mp3", "2.mp3", "3.mp3", "4.mp3", "5.mp3", "6.mp3", "7.mp3", "8.mp3"};
    //non toggled
    //White keys
    public String[] whiteKeys = {"a", "s", "d", "f", "g", "h", "j", "k", "l", ";", "'", "/"};
    public String[] whiteNotes = {"3c", "3d", "3e", "3f", "3g", "3a", "3b", "4c", "4d", "4e", "4f", "4g"};
    //Black keys
    String[] blackKeys = {"W", "E", "", "T", "Y", "U", "", "O", "P", "", "]"};
    String[] blackNotes = {"3c#", "3d#", "", "3f#", "3g#", "3a#", "", "4c#", "4d#", "", "4f#"};
    public void displayKeys() {
        int i = 0;
        while (i < whiteKeys.length) {
            Key key = new Key(whiteKeys[i], whiteNotes[i] + ".wav", "white", toggledWhite[i]);
            addObject (key, 54 + (i*key.getImage().getWidth()), 140);
            i++;
        }
        int x = 0;
        while (x < blackKeys.length) {
            Key key = new Key(blackKeys[x], blackNotes[x] + ".wav", "black", toggledBlack[x]);
            addObject (key, 85 + x*65, 85);
            x++;
           } 
        }
}