In Qt 5, what's the right way to show multi-monitor full screen QWidget windows?

Question

I have a Windows & Mac program that switches into full-screen mode on multiple monitors. In Qt 4, it seems (I can\'t find explicit documentation on how to do this) like

Answer 1

One way of doing it in Qt5 is to use QWindow::setScreen to set the screen on which the window should be shown. QWidget has a windowHandle() that returns the pointer to the QWindow. So you can get that pointer for each window and set a different screen.

Here is how to show your widget in the last screen in full-screen mode :

QWidget * widget = new QWidget();
widget->show();
widget->windowHandle()->setScreen(qApp->screens().last());
widget->showFullScreen();

Or in the second screen :

QWidget * widget = new QWidget();
widget->show();
widget->windowHandle()->setScreen(qApp->screens()[1]);
widget->showFullScreen();