If Zenity exits with code -1, the Cancel button was clicked.

如果Zenity的退出代码是- 1，单击的是Cancel按钮。

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You also want to supply a Cancel button with code as follows.

您还要提供一个 Cancel 按钮，其代码如下。

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This way, we do not need to implement the handler to the Cancel button.

通过这种方式，我们就无需实现Cancel按钮的处理程序。

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