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stlcours:QGridLayout-->QLayout-->QObject,所以QGridLayout也是QWidget,也得服从父子内存管理,也就是封建主义那一套,父要子亡,子不得不亡。然后就是setLayout:The QWidget will take ownership of layout. 取得所有权http://doc.qt.io/qt-5/qwidget.html#setLayout..... .. (2018-03-16 17:35)
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