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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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