I am using the QSFML repo to use sfml 2.x inside a Qt 6.x widget.

I cound not find a way to make the sfml background transparent to see classic qt widgets behind the sfml widget (whatever I try the SMFL background stay black).

Is this possible ? If it’s not I would very much appreciate an explaination (is it because of openGL limitations ?)

This is what I tryed :

setStyleSheet("* { background-color: transparent;}"); in qsfml widget and parent widget.

clear(sf::Color::Transparent); inside OnUpdate() function of qsfml widget.

Setting a background sprite with alpha channel in qsml widget.

Setting attributes like :

w->setWindowFlags(Qt::Window | Qt::FramelessWindowHint);
w->setAttribute(Qt::WA_NoSystemBackground);
w->setAttribute(Qt::WA_TranslucentBackground);
w->setAttribute(Qt::WA_PaintOnScreen);
w->setAttribute(Qt::WA_TransparentForMouseEvents);