What can I do for my QtWidget-Program's Window correctly positioned on the screen？

[JoeCFD]

@foghere2023 said in What can I do for my QtWidget-Program's Window correctly positioned on the screen？:

weston

Weston is the reference implementation of a Wayland compositor, as well as a useful environment in and of itself.

You can easily create a customized widget to replace it. Make your mainwindow to be its parent and it will always pop-up on top of main window.

The source code is here and you can borrow some
https://code.qt.io/cgit/qt/qtbase.git/tree/src/widgets/dialogs/qmessagebox.cpp?h=dev

[JoeCFD]

@foghere2023
Two solutions in that post:

1. Replace weston with Qtwayland compositor
2. Don't use wayland at all, but use the eglfs platform plugin.

You may not be able to select 2. Then try solution 1.
The side effect is you can't use g2d rendering. If you do not have issues with it, then go with it. Find out how to replace weston with Qtwayland compositor

[foghere2023]

@SGaist @JoeCFD

My friends, I may not have accurately described my problem, so that you did not understand what happened here. I didn't want to move the window, but the message pop-up window appeared in the wrong place.

this is a Demo:

https://github.com/cppxiaozhu/Demo

[JoeCFD]

@foghere2023 The post in the link had the exactly same problem.

The QDialog default position should locate at centered on top of the parent's top-level widget.
But QDialog in Wayland shows on a random position.

[foghere2023]

@JoeCFD Thank you friend，I have read that post，but I don't know how to do.

[JonB]

@foghere2023

but I don't know how to do.

@JoeCFD said:

Two solutions in that post:

1. Replace weston with Qtwayland compositor
2. Don't use wayland at all, but use the eglfs platform plugin.

You may not be able to select 2. Then try solution 1.

If that is what @JoeCFD are the alternatives then have you tried either of them?

[foghere2023]

@JonB @SGaist @JoeCFD

Hi friend，this is a simple Demo，could you show me how to improve or repair this issue ?

https://github.com/cppxiaozhu/Demo

I really want to fix this problem, but there is no example to learn.

The compilation environment I use is a binary version downloaded from the QT official website. Now almost all Linux distributions have defaulted to the wayland environment, and the official tools of QT cannot adapt to this new situation. I sincerely hope that someone can seriously deal with
the Bug that can be reproduced in one line of code

[JonB]

@foghere2023
You simply keep saying you don't know what to do and asking for help. We know it's know in the place you want. We know what your code is. We have said this is a Wayland issue, there is no more to ask about.

Let us know when you have tried, say, @JoeCFD's suggestions....

[foghere2023]

@JonB

Thank you for your patient explanation,

but the matter of refactoring wedgit is limited by my skills, and I can't solve it by myself.

I hope someone can give an example that can be used for reference.

Of course, it would be even better if the organization that promotes wayland or the Qt official can fix this problem.

I've been looking for discussions on the internet these days, but it's very strange to find so few people suffering from this problem.

[jsulm]

@foghere2023 said in What can I do for my QtWidget-Program's Window correctly positioned on the screen？:

but the matter of refactoring wedgit

The suggestion was not to refactor anything.
This was suggested by @JoeCFD

1. Replace weston with Qtwayland compositor
2. Don't use wayland at all, but use the eglfs platform plugin.

[foghere2023]

@jsulm thank you, but I don't konw what is ' Replace weston with Qtwayland compositor ':

this is a Demo，it is very simple, only a line sentence to delimit a popup message

https://github.com/cppxiaozhu/Demo

Where is ' weston ' ，and how to 'Replace weston with Qtwayland compositor' ?

On these most basic things, I can't figure it out.

[JoeCFD]

@foghere2023 https://www.youtube.com/watch?v=mIg1P3i2ZfI
I guess the default compositor on Wayland is weston. What you need to do is to replace it with Qtwayland compositor.
Turn weston off and turn Qtwayland compositor on.
Watch the video above and you may get some ideas.

[foghere2023]

@JoeCFD

thank you very much,

but I had watch that Video several days ago, the Video show us How to create a new Class by Qtwayland compositor with QML.

so I think maybe I need refactor all UI-Class such as QMessageBox or QDialog，This challenge is too difficult for me.

in my ubuntu22.04-lts，the wayland compositor is Xwayland.

my friend, your suggested「Turn weston off and turn Qtwayland compositor on」is mean I need do something with my Qtcreator or My PC system?

for example，what should I do in this Demo?

https://github.com/cppxiaozhu/Demo

If it is only for the correct position of the message prompt window of the compiled APP, then it is the easiest way to let their users no longer use the wayland desktop.

But I'm trying to do something to adapt this program to the wayland desktop.

I'm very depressed now because you guys say it's a wayland bug, and considering wayland's slow update mechanism, I don't think I'll see a solution in my lifetime.

As far as I know, the time it takes for wayland to fix some of its inherent problems needs to be counted in decades.

I've tried my best to find information, but almost none of them are particularly detailed.

[JoeCFD]

@foghere2023 I do not have an answer for you now. But I will take a look at it later.

[foghere2023]

@JoeCFD thank you

[foghere2023]

After a long time, the problem remains unsolved.

[Christian Ehrlicher]

@foghere2023 said in What can I do for my QtWidget-Program's Window correctly positioned on the screen？:

After a long time, the problem remains unsolved.

I don't think it's the correct place here when you want wayland improvements.

[foghere2023]

@Christian-Ehrlicher

It's a pity that qwidget can't adapt to the new changes brought by wayland.

[posktomten]

Maybe a workaround?

QMessageBox mMessageBox;
int x = this->x();
int y = this->y();
mMessageBox.setGeometry(x,y,300,100);

[foghere2023]

@posktomten

thank you , but it doesn't work，the Dialog cannot move itself to by 'move' func ，somebody says that wayland not provide coordinate data