private void UpdateMouseOnOrOffScreen()
    {
        bool onScreen = InputUtil.IsMouseOnScreen();

        if (onScreen != this.m_mouseOnScreen)
        {
            this.m_mouseOnScreen = onScreen;
            foreach (MouseOnOrOffScreenCallback callback in this.m_mouseOnOrOffScreenListeners.ToArray())
            {
                callback(onScreen);
            }
        }
    }
 private void Start()
 {
     this.m_mouseOnScreen = InputUtil.IsMouseOnScreen();
 }