Hi D L H,
I'm guessing the browser you were testing on when you tried this out was
Firefox 3? There is a known (and fixed) issue for this reported on the Issue
Tracker. See Issue #2902 (link below). The fix for the issue has been
committed all will be included in the next release.

Issue #2902:
http://code.google.com/p/google-web-toolkit/issues/detail?id=2902

If you're working from the GWT trunk, you can pick up and patch the issue
with r5398.

Hope that helps,
-Sumit Chandel

On Mon, Jun 8, 2009 at 7:09 AM, D L H <[email protected]> wrote:

>
> hello.
>
> i'm trying to make a TextBox that will change value when someone
> scrolls the mouse wheel over it. specifically, my goal is for the
> number in the text box to increase when i scroll up, and decrease when
> i scroll down. however, i'm having trouble figuring out the
> MouseWheelHandler. i simplified my code to just change the value to
> "UP" or "DOWN", but it just doesn't work. it compiles though. i also
> tried it with event.preventDefault(), but that didn't seem to have any
> effect.
>
> private TextBox valueField = new TextBox();
> ...
> ...
> valueField.addMouseWheelHandler(new MouseWheelHandler() {
>   public void onMouseWheel(MouseWheelEvent event) {
>      //event.preventDefault();
>      if(event.isNorth()) {
>         valueField.setText("UP");
>      } else {
>         valueField.setText("DOWN");
>      }
>   }
> });
> >
>

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