When the main window remains at the top, the child Windows are occluded - MacOS

[myxingkong]

Usually, the tools window is always at the top of the main window, even if it loses focus.However.

On MacOS, when the main window sets the window flag |Qt::WindowStaysOnTopHint, the Tool window is below it.

On a Windows system, the Tool window is at the top of the main window as expected.

Is there a way to keep the main window at the top while the Tool window is above it?

This is my test code

#include <QtGui>
#include <QtWidgets>

int main(int argc, char * argv[])
{
    QApplication app(argc, argv);

    QDialog* mw = new QDialog(0, Qt::WindowStaysOnTopHint | Qt::X11BypassWindowManagerHint);
    mw->setWindowTitle(QLatin1String("Main"));
    mw->resize(400, 300);
    mw->move(100, 100);

    QWidget* d = new QWidget(mw, Qt::Tool);
    d->setWindowTitle(QLatin1String("Tool"));
    d->resize(200, 100);
    d->show();
    mw->exec();
    return app.exec();
}

#include <QtGui>
#include <QtWidgets>

int main(int argc, char * argv[])
{
    QApplication app(argc, argv);

    QWidget* mw = new QWidget(0, Qt::WindowStaysOnTopHint | Qt::X11BypassWindowManagerHint);
    mw->setWindowTitle(QLatin1String("Main"));
    mw->resize(400, 300);
    mw->move(100, 100);
    mw->show();
    QWidget* d = new QWidget(mw, Qt::Tool);
    d->setWindowTitle(QLatin1String("Tool"));
    d->resize(200, 100);
    d->show();
    return app.exec();
}

#include <QtGui>
#include <QtWidgets>

int main(int argc, char * argv[])
{
    QApplication app(argc, argv);

    QWidget* mw = new QWidget(0, Qt::WindowStaysOnTopHint | Qt::X11BypassWindowManagerHint);
    mw->setWindowTitle(QLatin1String("Main"));
    mw->resize(400, 300);
    mw->move(100, 100);
    mw->show();
    QWidget* d = new QWidget(mw, Qt::Tool, Qt::WindowStaysOnTopHint | Qt::X11BypassWindowManagerHint);
    d->setWindowTitle(QLatin1String("Tool"));
    d->resize(200, 100);
    d->show();
    return app.exec();
}

[mrjj]

Hi
Im not sure the Tool type will stay on top of Dialog with Qt::WindowStaysOnTopHint.
Did you try to raise() it ?

[myxingkong]

@mrjj This doesn't seem to work. I tried setting Qt::WindowStaysOnTopHint flag on the Tool window, but it didn't help either.

[mrjj]

@myxingkong
Hmm, i dont have any macOS to test on.
I suspect its due to QDialog as the mainwindow but im not 100% sure.

[SGaist]

HI,

What version of Qt ?
On what version of macOS ?

[myxingkong]

@SGaist Macos version 10.13.4,Qt5.9.6 and Qt5.12.1

[SGaist]

It's a bug in the Cocoa backend.

You should take a look at the bug report system to see if there's anything related. If not, please consider opening a new report providing a complete buildable project reproducing the behaviour.