A device that gives a visual or other indication of the existence of a defined state.
一种装置，它给出某种规定状态存在的一个可见的或其它方式的指示。
If a method gets called in response to a clearly defined state change, the method should be invoked by an event handler.
如果为响应明确定义的状态更改而调用一个方法，则应由事件处理程序调用该方法。
If a method gets called in response to a clearly defined state change, the method should be invoked by an event handler.
如果为响应明确定义的状态更改而调用一个方法，则应由事件处理程序调用该方法。
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