visibilitychange event

I wanted to know when the visibilitychange event was fired (ie: the browser is minimised).  I've coded it in JavaScript, as I couldn't see it being supported in GWT:

private static native final String getVisibilityState() /*-{
return document.visibilityState;
}-*/;
private static native final void listenForVisibliltyChange(Command onChange) /*-{
document.addEventListener("visibilitychange", function() {
onChange.@com.google.gwt.user.client.Command::execute(*)();
}, false);
}-*/;

I'm not sure if doing calls like this causes memory leaks or anything.  Please shout out if you know of any issues doing it this way.

Thanks.

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