The start method is called after you click the mouse button, and the end method is called after you release the button.

单击鼠标按钮后，调用start方法，释放鼠标按钮后，调用end方法。

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The start method is called after you click the mouse button, and the end method is called after you release the button.

单击鼠标按钮后，调用start方法，释放鼠标按钮后，调用end方法。

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