How to resize items in qt layout?

Question

I am currently starting to play around with qt layouts, and I run into a problem: For example if I use a VBoxLayout , then every item gets the same space as the others, eg they separate the space equally. But in my case I want to have one item with 90 % space and the other one with 10% space. I already found out that I can use sizePolicy for that, but I have not found this if I want to resize layouts in layouts (eg if I set a layout and an item in another layout). Thus: how can I resize layouts?

Answer 1

Specifically for this reason you can use QBoxLayout::setStretchFactor .

This method sets how much space should accomodate each widget or layout in coefficients.

You can pass whether QWidget or QLayout there.

You can read more about stretch factors here .

EDIT: Here is a simple example which illustrates how it works:

QFrame* f1 = new QFrame;
f1->setFrameStyle(QFrame::Box);
QFrame* f2 = new QFrame;
f2->setFrameStyle(QFrame::Box);
QWidget* w = new QWidget;
QVBoxLayout* l = new QVBoxLayout;
w->setLayout(l);
l->addWidget(f1);
l->addWidget(f2);
l->setStretchFactor(f1, 1);
l->setStretchFactor(f2, 2);
w->show();

Result: