qt - 当小部件集更改时，调整 QWidget 的大小以仅保存当前小部件

Question

假设有一个QWidget布局是垂直的。此布局有一个按钮 (bt1) 和另一个布局 ( hLayout)。

该应用程序可以运行，以便单击 bt1 添加/删除hLayout.

第一次添加按钮时，窗口变大（宽度增加）以保持新按钮。下一次单击隐藏按钮。但是隐藏按钮不会使窗口缩小。我希望与添加按钮之前的大小相同。

删除按钮时正确缩小窗口的方法是什么？或者更一般地说，使窗口获得足够大小的方法是什么？

Answer 1

As long as doing explicit size adjustments with resize implies to cover all possible events there is lighter and smarter approach to make the widget resize properly automatically. Have a look at QWidget::setSizePolicy and QSizePolicy.

In situation like yours I often use:

// your specific code and size policy *may* differ
widget->setMinimumSize(width, height);
widget->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);

and don't interfere with event handlers to resize to specific size in such or many cases.

Answer 2

widget->resize(widget->minimumSize())从 中删除按钮后只需调用hLayout。