Retain width of vertical scrollbar when hidden in a QScrollArea

Jonas Kvinge

Hi,

When using a QWidget inside a layout on a QScrollArea with horizontal scrollbar disabled and vertical scrollbar set to Qt::ScrollBarAsNeeded, it causes a resize of the width each time the vertical scrollbar is automatically activated/deactivated.
I can't find a way to keep the width of vertical scrollbar when it's hidden.
I've tried the following code:

QSizePolicy size_policy = scrollarea_->verticalScrollBar()->sizePolicy();
size_policy.setRetainSizeWhenHidden(true);
scrollarea_->verticalScrollBar()->setSizePolicy(size_policy);

Or is there an alternative solution using layout or spacer that can fill the gap of the of the scrollbar to avoid the resize of the width?

JoeCFD

Try it out to set a fixed width with stylesheet of QScrollBar:vertical
https://doc.qt.io/qt-6/stylesheet-examples.html

Jonas Kvinge

The width of the scrollbar is changed but it still doesn't retain the size when hidden.