/*
 * @(#)AudioItem.java	1.26f 95/03/22 James Gosling
 *
 * Copyright (c) 1994 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Permission to use, copy, modify, and distribute this software
 * and its documentation for NON-COMMERCIAL purposes and without
 * fee is hereby granted provided that this copyright notice
 * appears in all copies. Please refer to the file "copyright.html"
 * for further important copyright and licensing information.
 *
 * SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
 * THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
 * TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR
 * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
 * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
 */

import java.applet.AudioClip;
import java.awt.Graphics;
import java.net.URL;

/**
 * A simple Item class to play an audio clip.
 * 
 * @author James Gosling
 */

public class AudioItem extends java.applet.Applet {
	/**
	 * The sounds to be played.
	 */
	private String sounds;

	/**
	 * The index of the next sound in the sounds strings.
	 */
	private int index;

	/**
	 * The currently playing audio stream, or null when no audio is playing.
	 */
	private AudioClip audio;

	/**
	 * Play the next sound. The sound URLS are obtained from the "snd"
	 * attribute. You can specify a list of them by seperating the sounds by
	 * '|'s.
	 * <p>
	 * Note that the URL is constructed relative to the getDocumentBase(), that
	 * is because the url is obtained from within the document
	 */
	public void next() {
		try {
			if (audio != null) {
				audio.stop();
				audio = null;
			}

			String url = sounds;
			if (sounds.indexOf('|') >= 0) {
				int start = index;
				if ((index = sounds.indexOf('|', index)) < 0) {
					url = sounds.substring(start);
					index = start;
				} else {
					url = sounds.substring(start, index++);
				}
			}
			if (url.length() > 0) {
				audio = getAudioClip(new URL(getDocumentBase(), url));
				audio.play();
			}
		} catch (Exception e) {
		}
	}

	/**
	 * Initialize the applet. First resize it, then get the "snd" attribute.
	 */
	public void init() {
		resize(10, 12);

		sounds = getParameter("snd");
		if (sounds == null) {
			sounds = "doc:/demo/audio/ding.au";
		}
	}

	/**
	 * When the applet is started play the next sound.
	 */
	public void start() {
		next();
	}

	/**
	 * When the applet is stopped, stop playing the current sound.
	 */
	public void stop() {
		if (audio != null) {
			audio.stop();
			audio = null;
		}
	}

	/**
	 * When the user clicks in the applet, play the next sound.
	 */
	public boolean mouseUp(java.awt.Event evt, int x, int y) {
		next();
		return true;
	}

	/**
	 * Paint an audio icon.
	 */
	public void paint(Graphics g) {
		double f = ((double) (getHeight() - 1)) / ((getWidth() - 1) * 2);
		int offset = getHeight() / 2;
		for (int i = getWidth() - 1; i >= 0; i -= 3) {
			int h = (int) (i * f);
			g.drawLine(i, offset - h, i, offset + h);
		}
	}
}