Hi Mark,
Looks like you have uncovered a bug. Both behviors should get the
event. Thanks for the test case.
--
Kevin Rushforth
Java 3D Team
Sun Microsystems
[EMAIL PROTECTED]
>Date: Thu, 17 Dec 1998 13:24:47 -0800
>From: "Mark J. Young" <[EMAIL PROTECTED]>
>To: [EMAIL PROTECTED], [EMAIL PROTECTED]
>Subject: Behaviors that WakeupOnAWTEvent block other Behaviors?
>
>In a single scene graph, if I have more than one Behavior
>that wakes up on AWT events, its seems that only one Behavior
>will wakeup - the one that is encountered first in a traversal.
>The other Behaviors are effectively blocked from hearing
>about the event they are also interested in.
>
>Is this a bug? Am I doing something wrong? I've appended
>a short example below. Only the Behavior labeled "A"
>will wakeup (and print out a message).
>
>Its not obvious from the documentation that things should
>work this way. I don't like this property. While, I
>appreciate that performance would be more efficient if there
>was only one Behavior that would wake up for a particular
>event, it limits how well scene graph objects can be encapsulated.
>I am trying to develop Java3D components that I can mix and
>match in any scene - I am trying to give them independent
>responsibility for what they do about AWT events.
>I'd appreciate any feedback.
>
>Regards,
>Mark
>
>p.s.
>// testMultAwt.java - demonstrate how one behavior blocks another
>
>import com.sun.j3d.utils.applet.MainFrame;
>import com.sun.j3d.utils.universe.SimpleUniverse;
>import java.applet.Applet;
>import javax.vecmath.Point3d;
>import javax.media.j3d.*;
>import java.awt.*;
>import java.awt.event.*;
>import java.util.*;
>
>public class testMultAwt extends Applet
>{
> public static void main(String[] args)
> { new MainFrame(new testMultAwt(), 200, 200); }
>
> public testMultAwt()
> {
> // two behaviors, each listening for AWT MousePress
> // - if one wakes up it will print a message that
> // includes the label passed here to the constructor
> // "The Problem" - only "A" will print out messages
> BranchGroup scene = new BranchGroup();
> scene.addChild(new MouseResponse("A"));
> scene.addChild(new MouseResponse("B"));
>
> // bare necessities for a live scene graph
> // that includes the above
> Canvas3D canv = new Canvas3D(null);
> SimpleUniverse univ = new SimpleUniverse(canv);
> univ.getViewingPlatform().setNominalViewingTransform();
> univ.addBranchGraph(scene);
> setLayout(new BorderLayout());
> add("Center", canv);
> }
>
> Bounds bounds = new BoundingSphere(new Point3d(0f,0f,0f), 100f);
> WakeupCondition mousePress = new WakeupOnAWTEvent(MouseEvent.MOUSE_PRESSED);
>
> class MouseResponse extends Behavior
> {
> String label;
> long count = 0;
>
> MouseResponse(String label)
> {
> super();
> this.label = label;
> setSchedulingBounds(bounds);
> }
>
> public void initialize() { wakeupOn(mousePress); }
>
> public void processStimulus(Enumeration criteria)
> {
> while (criteria.hasMoreElements()) {
> WakeupCriterion criterion =
>(WakeupCriterion)criteria.nextElement();
> if (criterion instanceof WakeupOnAWTEvent) {
> AWTEvent[] event =
>((WakeupOnAWTEvent)criterion).getAWTEvent();
> for (int i=0 ; i < event.length ; i++, count++)
> System.out.println(
> "AWTEvent(" + label + ")[" + count + "]"
> + ": " + "event[" + event[i].getID() + "]"
> + " @ " + ((MouseEvent)event[i]).getX()
> + "," + ((MouseEvent)event[i]).getY()
> );
> }
> }
> wakeupOn(mousePress);
> }
> }
>}
>
>// end of file
>
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