Qt: how to set main window's initial position?

Question

I think the normally window manager determines the initial position of the QMainWindow position on the desk top. I want to set the initial position myself. How is this done with Qt on Windows?

Answer 1

I believe you're looking for setGeometry.

Answer 2

You can restore the window geometry with restoreGeometry(), and the state of docked elements with restoreState(), during the construction of your MainWindow...

    QSettings settings("yourcompany", "yourapp");

    restoreGeometry(settings.value("geometry").toByteArray());
    restoreState(settings.value("state").toByteArray(),YOUR_UI_VERSION);

Then, if you override closeEvent(), you can save the state as follows:

    QSettings settings("yourcompany", "yourapp");

    settings.setValue("geometry", saveGeometry());
    settings.setValue("state", saveState(YOUR_UI_VERSION));

YOUR_UI_VERSION is a constant you should increment when your UI changes significantly to prevent attempts to restore an invalid state.