控制器处理所有UI事件，例如单击按钮、选择菜单以及更改文本字段。

The controller handles all UI events, such as button clicks, menu selection, and text-field changes.

youdao

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.

youdao

处理单击ok按钮时的事件。

Handles the event when the OK button is clicked.

youdao