Indicates that the widget paints all its pixels. Updating, resizing, scrolling and focus changes should therefore not erase the widget. This allows smart-repainting to avoid flicker.

• 指出该窗体将画出它所有的像素。因此,更新,改变大小,滚动和焦点改变都不会擦除该窗体。这就允许快速重画从而避免了闪烁。