生成鼠标键按下和释放事件。

Generating mouse button press and release events.

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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.

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弹出菜单的条目可以通过释放一个被按下的鼠标键来激起。

Items of a popup menu are also activated by releasing a held mouse button.

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