版权声明:微信 kobesdu https://blog.csdn.net/kobesdu/article/details/82706498
QGridLayout *mainLayout =new QGridLayout(this);
mainLayout -> addWidget(tree, 0, 0);
mainLayout -> addWidget(stackedWidget, 0, 1);
mainLayout -> setColumnStretch(0,3);
mainLayout -> setColumnStretch(1,5);
mainLayout -> setRowStretch(0, 1);
mainLayout -> setRowStretch(1, 0);
widget->setLayout(mainLayout);
setCentralWidget(widget);