1. override
void advanceTime(num deltaTime)

Source

@override
void advanceTime(num deltaTime) {

  _currentTime += deltaTime;

  _enterFrameEvent.passedTime = deltaTime;
  _enterFrameEvent.dispatch();

  juggler.advanceTime(deltaTime);

  for (int i = 0; i < _stages.length; i++) {
    _stages[i].juggler.advanceTime(deltaTime);
  }

  if (_invalidate) {
    _invalidate = false;
    _renderEvent.dispatch();
  }

  for (int i = 0; i < _stages.length; i++) {
    _stages[i].materialize(_currentTime, deltaTime);
  }

  _exitFrameEvent.dispatch();
}