How to hide borders in a QTDialog under Wayland?

roipoussiere

I'm developing a Qt application in Python that I would like make compatible with Sway/Wayland.

This simple script is supposed to create a modal window without borders neither title:

import sys
from PyQt5.QtWidgets import QApplication, QDialog, QLabel
from PyQt5.QtCore import Qt

app = QApplication(sys.argv)
d = QDialog()
d.setModal(True)
d.setWindowFlags(Qt.WindowStaysOnTopHint | Qt.FramelessWindowHint)

d.setMinimumWidth(400)
d.setMinimumHeight(400)
d.setMaximumWidth(400)
d.setMaximumHeight(400)

QLabel('Hello world', d)
d.show()
sys.exit(app.exec_())

But the borders are still here:

It seems that this is not an issue with Sway, so I suppose it's a Qt issue?

SGaist

Hi and welcome to devnet,

I don't see anything that is related to border nor title in your code. So I would say that either your code is incomplete or you don't have the correct expectation from Wayland. You are also not showing how you start your application.

roipoussiere

@SGaist said in How to hide borders in a QTDialog under Wayland?:

Hi and welcome to devnet,

Thank you! :)

I don't see anything that is related to border nor title in your code.

It's this line:

d.setWindowFlags(Qt.WindowStaysOnTopHint | Qt.FramelessWindowHint)

You are also not showing how you start your application.

To execute under Wayland I do:

QT_QPA_PLATFORM=wayland-egl .venv/bin/python ./main.py

And for X11 (where borders are not present) I do:

QT_QPA_PLATFORM=xcb .venv/bin/python ./main.py

SGaist

@roipoussiere said in How to hide borders in a QTDialog under Wayland?:

d.setWindowFlags(Qt.WindowStaysOnTopHint | Qt.FramelessWindowHint)

That line doesn't appear in the code of your original post.

Can you give more information about your Wayland setup ?

roipoussiere

@SGaist said in How to hide borders in a QTDialog under Wayland?:

That line doesn't appear in the code of your original post.

I edited my post to add this specific line few minutes after submitting it. It's strange that you don't see it.

Can you give more information about your Wayland setup ?

I use Sway Window manager with the default config.

You can find here (after clinking on Details) the logs when executing my script with WAYLAND_DEBUG=client.

roipoussiere

Any news here?

Can someone confirm that this is a Qt issue on Wayland?

roipoussiere

I reported this bug here: https://bugreports.qt.io/browse/QTBUG-80702