$tick method
TODO: need to find a way to reference the window.
(Internal usage)
Updates the Stage object and dispatches the enterFrame
event with
the delta
time since the last frame, in seconds.
Implementation
// GxRect getScreenBounds(DisplayObject targetSpace, [GxRect out]) {
// out ??= GxRect();
// out.setTo(0, 0, stageWidth, stageHeight);
// getTransformationMatrix(targetSpace, _sMatrix);
// return out.getBounds(_sMatrix, out);
// }
/// (Internal usage)
/// Updates the [Stage] object and dispatches the `enterFrame` event with
/// the [delta] time since the last frame, in seconds.
void $tick(double delta) {
$onEnterFrame?.dispatch(delta);
super.update(delta);
}