清单3显示了两个监听器中其中一个监听器的代码，该监听器接收通过消息总线传送的CaseModel，然后将提供的文本转换为大写体和小写体。

Listing 3 shows the code for one of two listeners that receive the CaseModel delivered through the message bus and convert the provided text to upper and lower case.

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您可以使用菜单命令或键盘快捷键将选定文本的大小写转换为全部大写或全部小写。

You can use menu commands or keyboard shortcuts to convert the case of selected text to all upper case or to all lower case.

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