public void RegisterAnimationDoneListener(AnimationDoneListener listener)
 {
     if (!this.m_animationDoneListeners.Contains(listener))
     {
         this.m_animationDoneListeners.Add(listener);
     }
 }
 public void RemoveAnimationDoneListener(AnimationDoneListener listener)
 {
     this.m_animationDoneListeners.Remove(listener);
 }