如何在 Qt 中保持小部件的纵横比?
如何在 Qt 中保持小部件的纵横比以及居中小部件怎么样?
How is it possible to maintain widgets aspect ratio in Qt and what about centering the widget?
您不必实现自己的布局管理器.你可以继承 QWidget 并重新实现
You don't have to implement your own layout manager. You can do with inheriting QWidget and reimplementing
int QWidget::heightForWidth( int w ) { return w; }
保持正直.但是，heightForWidth() 在 X11 上的顶层窗口上不起作用，因为显然 X11 协议不支持它.至于居中，可以将Qt::AlignCenter作为QBoxLayout::addWidget()的第三个参数或QGridLayout::addWidget()的第五个参数传入.
to stay square. However, heightForWidth() doesn't work on toplevel windows on X11, since apparently the X11 protocol doesn't support that. As for centering, you can pass Qt::AlignCenter as the third parameter of QBoxLayout::addWidget() or the fifth parameter of QGridLayout::addWidget().
注意:至少在较新版本的 Qt 中，QWidget 不再具有 heightForWidth 或 widthForHeight(因此它们不能被覆盖)，因此 setWidthForHeight(true) 或 setHeightForWidth(true) 只对 QGraphicsLayout 的后代有效.
Note: In newer versions of Qt at least, QWidget does not have the heightForWidth or widthForHeight anymore (so they cannot be overriden), and therefore setWidthForHeight(true) or setHeightForWidth(true) only have an effect for descendants of QGraphicsLayout.