// third in the series, adds a button component to control text color



// these first lines tell javac which class libraries we plan to use

import java.applet.*;

import java.awt.*;



// define a new subclass of applet, with 3 variables plus an array with index

public class HelloWorld3 extends Applet {

	int messageX = 125, messageY = 80;

	String messageparam;

	Button ourButton;

	Color [] someColors = {

		Color.blue, Color.green, Color.yellow, Color.orange, Color.red, Color.magenta };

	int colorIndex;



// define the init method, gets input from .html, labels and adds button to screen

	public void init() {

		messageparam = this.getParameter ("message");

		ourButton = new Button ("Moderately Magical Button");

		add (ourButton);

	}



// define a paint method, which is driven by three variables defined elsewhere

	public void paint (Graphics messagetext) {

		messagetext.setColor (currentColor());

		messagetext.drawString (messageparam, messageX, messageY);

	}



// define method to handle the button push event by getting a new color

	public boolean action(Event e, Object o) {

		if (e.target == ourButton) {

			play(getCodeBase(), "audio/yahoo1.au");
			changeColor();

			return true;

		}

		return false;

	}



// define an event handling method, which reposiitons messagetext at new x,y coordinates

	public boolean mouseMove (Event evt, int x, int y) {

		messageX = x;

		messageY = y;

		repaint();

		return true;

	}



// define method to make a new color the current one

	synchronized private Color currentColor() {

		return someColors[colorIndex];

	}



// define method to make a new color the current one

	synchronized private void changeColor() {

		if (++colorIndex == someColors.length)

			colorIndex = 0;

		ourButton.setForeground(currentColor());

		repaint();

	}

}