如何在Qt中维护小部件的长宽比? [英] How to maintain widgets aspect ratio in Qt?

问题描述

如何在Qt中保持小部件的宽高比以及如何使小部件居中?

How is it possible to maintain widgets aspect ratio in Qt and what about centering the widget?

推荐答案

您不必实现自己的布局管理器.您可以继承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; }

保持正方形.但是，heightForWidth()在X11的顶级窗口上不起作用，因为显然X11协议不支持该功能.至于居中，您可以将Qt::AlignCenter作为QBoxLayout::addWidget()的第三个参数或QGridLayout::addWidget()的第五个参数传递.

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) 仅对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.

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