Qt: Set size of QMainWindow

Question

I'm new to Qt, so I wonder whether there is a way to set the size of a QMainWindow to (for example) 70% of the user's desktop.
I tried the stretch factor but it didn't work. QWidget::setFixedSize worked but only with a pixel number, I think.

Answer 1

Somewhere in your QMainWindow constructor, do this:

resize(QDesktopWidget().availableGeometry(this).size() * 0.7);

This will resize the window to 70% of the available screen space.

Answer 2

Thanks to Amir eas. The problem is solved. Here's the code for it:

#include <QDesktopWidget> #include <QMainWindow> ... QDesktopWidget dw; MainWindow w; ... int x=dw.width()*0.7; int y=dw.height()*0.7; w.setFixedSize(x,y);