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pyqt中videowidget设置全屏后，和父窗口脱离

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pyqt中videowidget设置全屏后，和父窗口脱离

我设计了个播放器界面，使用用videowidget显示视频画面，videowidget部件放置在QMainWindow窗体上。然后设置videowidget为全屏时，无意中按下alt+tab切换为其他程序界面时，发现QMainWidow窗体已经与QVideoWidget部件脱离，并没有一起全屏。

请教大佬，如何让QMainWindow一起跟随QVideoWidget全屏。当我按下alt+tab时，只显示一个程序图标？


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