A rectangular area of the screen that may respond to user input events.

屏幕的一个矩形区域，能响应用户的输入事件。

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Presents a code example that handles most user input events and reports information about each event.

显示处理大部分使用者输入事件和报告每个事件的相关资讯的程式码范例。

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While events are often used to handle user input and other actions that happen asynchronously, the events themselves happen in synchronous fashion.

虽然事件常常被用于处理用户输入和其它异步发生的行为，但事件本身是以同步方式发生的。

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