删除qt小部件时删除空间

Question

I have a grid layout on top of which there are 4 group boxes. When I try to hide one of the QGroupBoxes using groupBox->hide() , the group box is not visible anymore. But the space is retained in the layout (I am not using QSizePolicy to retain the space)

How do I make sure that space is automatically used by the remaining widgets?

In the picture, I have hidden 'Group 2'. I want Group 3 to automatically fill up the space. How do I do this?

Answer 1

In order for the layout to do what you want, its child widgets have to 'behave' correctly. Ie if one of your group boxes contains a vertical spacer, it might mess up your layout.

I found that setting a stylesheet to the toplevel widget helps with debugging layout issues:

pWidget->setStyleSheet("border: 1px solid red;");

This will paint a red border around (some) widgets and clarifies who uses which space.

You could try to add a vertical spacer below the third group box to "push" them all upwards. If one of the group boxes is then set to invisible, the others should get pushed up and the space between group box 1 and 3 should disappear.