void GetPointer()
        {
            if (pointer != null)
            {
                return;
            }

            pointer = uTouchInjection.Manager.GetPointer(currentId);
            currentId++;
        }
        void ReleasePointer()
        {
            if (pointer == null)
            {
                return;
            }

            pointer.Release();
            pointer = null;
            currentId--;
        }