接口策略是当鼠标键按下时，在鼠标当前坐标打开“失真门户”。
The interface strategy is to have a "distortion portal" opened at the current mouse coordinates when the mouse button is down.
当鼠标事件触发的时候，鼠标哪个按钮被按下。
The button number that was pressed when the mouse event was fired.
按下-第二个按钮要求当鼠标指针位于该按钮上时按下鼠标。
Press - the second button requires that the mouse be pressed while the mouse pointer is in the button.
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