问如何模拟鼠标释放事件？

EN

bool mouseIsDown = false;

public void Update()
{
    Rect screenRect = new Rect(-Screen.width/2, -Screen.height/2, Screen.width, Screen.height);

    If(screenRect.Contains(Input.mousePosition))
    {
        if(mouseIsDown && !Input.GetMouseButton(0))
            OnMouseUp();

        if(Input.GetMouseButton(0))
        {
            OnMouse();
            if(!mouseIsDown)
            {
                OnMouseDown();
                mouseIsDown = true;
            }
        }
    }
}

public void OnMouseDown()
{
    // Do something
}

public void OnMouse()
{
    // Do something
}

public void OnMouseUp()
{
    // Do something
}

void OnMouseUp () {
}

void OnMouseDown (){
}