How to use QWindowsWindowFunctions::setHasBorderInFullScreen in Qt6

nitingera

I am trying to use QWindowsWindowFunctions::setHasBorderInFullScreen method in Qt6 as mentioned in the documentation https://doc-snapshots.qt.io/qt6-dev/windows-issues.html
But this function is not available in Qt6..
Any ideas how to proceed with this?

Bonnie

After searching in the qt source codes, I think it can be done like this:

First, add this in your .pro file

QT += gui-private

If you use CMake instead of .pro file, here is the CMake way in this post.

Then in you source code

#include <qpa/qplatformwindow_p.h>

...

if(auto inf = windowHandle()->nativeInterface<QNativeInterface::Private::QWindowsWindow>()) {
	inf->setHasBorderInFullScreen(true);
}

nitingera

Thanks @Bonnie
I found out another way it works

if (QWindowsWindow* windowsWindow = dynamic_cast<QWindowsWindow*>(windowHandle()))
windowsWindow->setHasBorderInFullScreen(true);