public TrackEntry AddAnimation(int trackIndex, string name, bool loop, float delay = 0)
        {
            Animation animation = Skeleton.Data.FindAnimation(name);

            if (animation == null)
            {
                CCLog.Log("Spine: Animation not found: %s", name);
                return(null);
            }
            return(State.AddAnimation(trackIndex, animation, loop, delay));
        }