How to add CSS AnimationEnd event handler to GWT widget?

Question

I would like my GWT widget to be notified when its CSS animation is over.

In plain HTML/Javascript this is easily done by registering an event handler like so:

Answer 1

I expanded a bit on the solution from Darthenius. This code also includes a mechanism to remove the event handler when it is finished. This is what I needed for my application but may not be what you want in all contexts. YMMV!

My final code looks like this:

import com.google.gwt.dom.client.Element;
import com.google.gwt.user.client.rpc.AsyncCallback;

public class CssAnimation {
    public static native void registerCssCallback(Element elem, AsyncCallback callback) /*-{
        var eventListener = function () {
            $entry(@CssAnimation::cssCallback(Lcom/google/gwt/user/client/rpc/AsyncCallback;)(callback));
            elem.removeEventListener("webkitAnimationEnd", eventListener);
        };

        elem.addEventListener("webkitAnimationEnd", eventListener, false);
    }-*/;

    protected static void cssCallback(AsyncCallback callback) {
        callback.onSuccess(null);
    }
}