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Chip 1998 November
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SoundArea.java
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1996-12-06
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/*
* @(#)SoundArea.java 1.7 96/12/06
*
* Copyright (c) 1994-1996 Sun Microsystems, Inc. All Rights Reserved.
*
* Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
* modify and redistribute this software in source and binary code form,
* provided that i) this copyright notice and license appear on all copies of
* the software; and ii) Licensee does not utilize the software in a manner
* which is disparaging to Sun.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
* IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
* NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
* LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
* OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
* LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
* INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
* CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
* OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
* This software is not designed or intended for use in on-line control of
* aircraft, air traffic, aircraft navigation or aircraft communications; or in
* the design, construction, operation or maintenance of any nuclear
* facility. Licensee represents and warrants that it will not use or
* redistribute the Software for such purposes.
*/
import java.awt.Graphics;
import java.applet.AudioClip;
import java.net.URL;
import java.net.MalformedURLException;
/**
* An audio feedback ImageArea class.
* This class extends the basic ImageArea Class to play a sound when
* the user enters the area.
*
* @author Jim Graham
* @author Chuck McManis
* @version 1.7, 12/06/96
*/
class SoundArea extends ImageMapArea {
/** The URL of the sound to be played. */
URL sound;
AudioClip soundData = null;
boolean hasPlayed;
boolean isReady = false;
long lastExit = 0;
final static int HYSTERESIS = 1500;
/**
* The argument is the URL of the sound to be played.
*/
public void handleArg(String arg) {
try {
sound = new URL(parent.getDocumentBase(), arg);
} catch (MalformedURLException e) {
sound = null;
}
hasPlayed = false;
}
/**
* The applet thread calls the getMedia() method when the applet
* is started.
*/
public void getMedia() {
if (sound != null && soundData == null) {
soundData = parent.getAudioClip(sound);
}
if (soundData == null) {
System.out.println("SoundArea: Unable to load data "+sound);
}
isReady = true;
}
/**
* The enter method is called when the mouse enters the area.
* The sound is played if the mouse has been outside of the
* area for more then the delay indicated by HYSTERESIS.
*/
public void enter() {
// is the sound sample loaded?
if (! isReady) {
parent.showStatus("Loading media file...");
return;
}
/*
* So we entered the selection region, play the sound if
* we need to. Track the mouse entering and exiting the
* the selection box. If it doesn't stay out for more than
* "HYSTERESIS" millis, then don't re-play the sound.
*/
long now = System.currentTimeMillis();
if (Math.abs(now - lastExit) < HYSTERESIS) {
// if within the window pretend that it was played.
hasPlayed = true;
return;
}
// Else play the sound.
if (! hasPlayed && (soundData != null)) {
hasPlayed = true;
soundData.play();
}
}
/**
* The exit method is called when the mouse leaves the area.
*/
public void exit() {
if (hasPlayed) {
hasPlayed = false;
lastExit = System.currentTimeMillis(); // note the time of exit
}
}
}