Window always on top but don't block input from others

QT-static-prgm

Hi,

i want to have a window that stays always on top of my MainWindow, but it shouldn't block the input from it.
OpenFileDialogs shouldn't be affected. So if i have my subwindow open, it stays over my MainWindow, but not over the FileOpenDialog.

i tried Qt::WindowStaysOnTopHint, but this makes it stay always on top and not only in top of my MainWindow.

using WindowModal and ApplicationModal both block the interaction with MainWindow.

I hope someone can help me :D

Chris Kawa

You're overcomplicating it. Just make the window child of the main window:

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

    MainWindow w;
    w.show();

    QDialog* dialog = new QDialog(&w);
    dialog->show();

    QFileDialog::getExistingDirectory(&w, "Hello");

    return a.exec();
}

or, if you want to use a plain QWidget instead of QDialog:

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

    MainWindow w;
    w.show();

    QWidget* widget = new QWidget(&w, Qt::Window);
    widget->show();

    QFileDialog::getExistingDirectory(&w, "Hello");

    return a.exec();
}

QT-static-prgm

@Chris-Kawa sometimes the easy way is the best way :D

Just one question i changed the palette from the QScrollArea of my subwindow, so the background is painted white.
Now it doesn't work anymore. I don't know why. Any ideas??

Already tried this:

ui->scrollArea->setStyleSheet("QScrollArea{background-color: #ffffff}");

But does not work.

Chris Kawa

Oh it works. It's just covered by other widgets. Inside a scroll area there's a viewport widget and in it a contents widget.
You can do what you want in many ways. For example you can narrow your stylesheet to apply to two widgets down:

ui->scrollArea->setStyleSheet("QScrollArea>QWidget>QWidget {background-color: #ffffff}");

Unfortunately that will also color the scrollbars, but you can instead style the content directly:

ui->scrollArea->widget()->setStyleSheet("background-color: #ffffff");

or be even more specific by giving it a name:

ui->scrollArea->widget()->setObjectName("content");
ui->scrollArea->setStyleSheet("#content {background-color: #ffffff}");

Yet another alternative, if you really want to color the scrollarea itself, is to stop Qt from drawing the background of the content:

ui->scrollArea->setStyleSheet("QScrollArea{background-color: #ffffff}");
ui->scrollArea->widget()->setAutoFillBackground(false);

Btw. Changing palette colors is wobbly at best. Not all styles use the palette for all elements.