有些控件类对鼠标按钮事件具有固有的类处理。

Some control classes might have inherent class handling for mouse button events.

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所有这些方法和常量应该会使得对按钮事件做出响应更加容易。

All these methods and constants should make responding to button events easier.

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当按钮释放的时候就发出一个实际按钮事件以及一个额外的别名关闭的事件。

When the set button is released it will emit the actual button event as well as an additional event that the alias button is "Off".

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