If the selection is a file (rather than a folder), then we adjust the text and tool tip to reflect that file name and enable it.

如果选择是文件(而不是文件夹)，则调整文本和工具提示以反映该文件的名称并启用它。

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When it notices a change, it can look at the new selection and change its text, tool tip, and enabled state to reflect that.

当它注意到变化时，会查看新的选择并更改它的文本、工具提示和启用状态来反映这一变化。

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When it notices a change, it can look at the new selection and change its text, tool tip, and enabled state to reflect that.

当它注意到变化时，会查看新的选择并更改它的文本、工具提示和启用状态来反映这一变化。

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