// requires: non-null callback method or listener class // effects: adds the callback to the list of composite cbs public void AddCompositeChangedCallback(CompositeChangedCallback callback) { _compositeChangeCbs.Add(callback); }
// requires: non-null callback method or listener class // effects: removes the callback from the list of composite image cbs; noop if not found public void RemoveCompositeChangedCallback(CompositeChangedCallback callback) { _compositeChangeCbs.Remove(callback); }