Qt::WindowFullScreen - window under taskbar in MS-Windows

[Andy314]

Hello,
I must bring the problem with a new topic on top once again.
Here is the minimal code to reproduce the error:

void MainWindow::on_pushButton_clicked()
{
    QDialog *dlg=new QDialog;
    dlg->setWindowState(Qt::WindowFullScreen);
    dlg->show();
}

I have check it with the latest Qt Version. 5.15.1 MSVC19-32 bit.
(Windows 10 - 2004-64 - but error is in earlier version too.)

The window gets full screen size but it is under the taskbar !

In Qt 5.6.0 MSVC15-32 bit it works - the Taskbar is hidden by the window.

It is very important for me, this behavior kills my app for my customer in the pure tablet enviroment.

[jsulm]

@Andy314 said in Qt::WindowFullScreen - window under taskbar in MS-Windows:

dlg->setWindowState(Qt::WindowFullScreen);

It should be

dlg->setWindowState(dlg->windowState() ^ Qt::WindowFullScreen);

as shown in https://doc.qt.io/qt-5/qwidget.html#setWindowState

[Andy314]

It should be

dlg->setWindowState(dlg->windowState() ^ Qt::WindowFullScreen);

as shown in https://doc.qt.io/qt-5/qwidget.html#setWindowState

Thank you very much for this tip. Nevertheless with this correction I get the same effect as before.

[jsulm]

@Andy314 Did you check in Qt bug tracker whether this is a known but not yet fixed issue?

[Bonnie]

Is it ok for you to add StaysOnTop hint? like

dlg->setWindowFlags(dlg->windowFlags() | Qt::WindowStaysOnTopHint);

QDialog does act very weirdly when showing full screen.
You may consider using a normal QWidget if it is not required to using QDialog.

[Andy314]

@jsulm said in Qt::WindowFullScreen - window under taskbar in MS-Windows:

@Andy314 Did you check in Qt bug tracker whether this is a known but not yet fixed issue?

I found no matching article in th bug tracker.

[Andy314]

@Bonnie said in Qt::WindowFullScreen - window under taskbar in MS-Windows:

Is it ok for you to add StaysOnTop hint? like

dlg->setWindowFlags(dlg->windowFlags() | Qt::WindowStaysOnTopHint);

QDialog does act very weirdly when showing full screen.
You may consider using a normal QWidget if it is not required to using QDialog.

Indeed it works ! Its good for me - thank you very much for this hint.
(I made experiments with Qt::Popup before, but this gave problems with the visibility of the virtual keyboard.)
Its an interesting way to use a QWidget. Unfortunately I made a BaseClass derived for QDialog with my standard tasks in it. Second I use the same Dialog in the desktop enviroment in a MDI-windows.

[Pablo J. Rogina]

@Andy314 said in Qt::WindowFullScreen - window under taskbar in MS-Windows:

Indeed it works !

is your issue solved? if so, please don't forget to mark your post as such! Thanks.