For instance, many controls send a control color notification message( WM_ CTLCOLOR or one of its variants) to their parent to allow the parent to supply a brush for painting the background of the control.
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- 例如:许多控件会发送控件颜色通知消息(M_TLCOLOR或它的一个变体)其父窗口以允许其父窗口来提供一个绘制控件背景的刷子。