Hi,
I didn't see a place to post bugs, so I am submitting it to the group.
I've been working with GWT for a one off project on our website,
www.studyisland.com. I was attempting to use the Animation class (in
package com.google.gwt.animation.client) and could not figure out a
way to get an animation of an Image object to replay when I clicked on
it. I tried both rerunning the original Animation instance recreating
the instance and attempting to run it. My code is identical to the
example in the GWT showcase, with the exception that I create 3 unique
animations, one for each image on the page.
The showcase animation can be replayed, but in my case, where 3
animations existed the animations could not.
Digging into the Animation class, it is obvious why this is by the
line of code in the method run(int duration, double startTime):
// Restart the timer if there is the only animation
if (animations.size() == 1) {
animationTimer.schedule(DEFAULT_FRAME_DELAY);
}
So, you can't re-run an animation if you create more than one
animation instance on your page. Thats fine, there may be some
limitation that I'm unaware of to prevent this. I'll just reset the
Animation class back to its initial state and start over... but I
can't because the animations are driven by an array called
"animations" that is a private static member of the class, and there
are no accessible methods to reset it.
Fortunately the easy solution for me is to just copy all of the code
in the Animation class into a new class, and add a method
"resetAnimations" to take care of this.
public static void resetAnimations() {
animations.clear();
animations = null;
}
I just call this before re-running any animations, and everything
works fine.
Now, I consider myself pretty good with Java, but I'm not a javascript
expert so I can't say for sure whether doing this is safe or why the
original programmers didnt include this functionality initially.
However, I think it very likely that there will be other GWT users in
the future who might encounter this issue, hence I think it should be
addressed.
If you have any questions about my writeup here, or would like some
code or something like that, feel free to email me:
[email protected].
I'm loving GWT by the way. Thanks to everyone who has contributed!
-Michael
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