An example of a custom control is a clock control that duplicates the appearance and behavior of an analog clock 时钟控件即是一个自定义控件,它复制模拟时钟的外观和行为。
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An example of a custom control is a clock control that duplicates the look and action of an analog clock . custom painting would be invoked to cause the hands of the clock to move in response to 时钟控件即是一个自定义控件,它复制模拟时钟的外观和操作,自定义绘制将被调用来促使时钟指针走动,以响应内部计时器组件的