Can qwidget show on top of anoter app when that app is in fullscreen mode on Mac OS?

SGaist

Hi,

It's going to depend on the OS and the application.

Which are they ?

JoeCFD

Yes, you can. Set its parent to nullptr and the flag to on top. This works on Linux.

pengxu

@JoeCFD
like this?
QWidget* test = new QWidget();
test->setWindowFlag(Qt::WindowStaysOnTopHint);
test->show();

It does not work on Mac, when other app at fullscreen state

pengxu

@SGaist
I'm sorry, I re-edited the question.
What I need is on Mac OS system

mpergand

@pengxu
At least it works with Qt::tool window flag. (tested with one of my apps)
But, as the doc stated, it should work with Qt::WindowStaysOnTopHint, maybee in combination with another flag (dialog ?) .

JoeCFD

@pengxu said in Can qwidget show on top of anoter app when that app is in fullscreen mode on Mac OS?:

Qt::WindowStaysOnTopHint

Try to create a window and set the flags as below to see if it works. Do not use qwidget.
setWindowFlags(Qt::CustomizeWindowHint
| Qt::FramelessWindowHint
| Qt::WindowStaysOnTopHint);

Sure, as mpergand suggested, you can try qdialog as well.

Or something like subwindow? not sure. Never used it.
https://localcoder.org/notification-window-in-mac-with-or-without-qt#solution_1

If nothing works, add overlay widget to the fullscreen widget and use the full screen widget as parent. this will work.

SGaist

A full screen application on macOS is not the same thing as one on Windows or Linux. It moves to its own "desktop" and thus other applications are not working on the same space.

What exactly are you trying to do with your application ?

pengxu

@SGaist
My application has an function "sharing screen", there is toolbar on top of screen that users can try to stop sharing. Even when user is using other apps on fullscreen mode.
I can achieve this by using objective-c code, but I don't know how to achieve this by Qt

pengxu

@JoeCFD
I tried this, but it does not work either
QDialog* test = new QDialog();
// test->setWindowFlags(Qt::WindowStaysOnTopHint | Qt::Tool | Qt::FramelessWindowHint);
test->setWindowFlags(Qt::CustomizeWindowHint
| Qt::FramelessWindowHint
| Qt::WindowStaysOnTopHint);
test->show();

SGaist

Since it's macOS specific, nothing wrong with mixing some Objective-C++ to achieve your objective.

JoeCFD

@pengxu try overlay widget with fullscreen widget as parent.

abooo

@pengxu Can you share how to use object-c to implement this feature?

Rida Shamasneh

Hi all,

Any help with this issue?