How to keep a QWidget (or QDialog) centered to its parent widget?

Question

I want to keep a QWidget (or QDialog) centered to its parent widget. Is it really required to connect to signals of the parent widget or is there an easier way (something to

Answer 1

I solved it myself and just to answer my own question if someone will find it helpful.

Keep it in the center:

void MyMainWindow::moveEvent(QMoveEvent* event)
{
    const QPoint global = this->mapToGlobal(rect().center());
    waitDialog->move(global.x() - waitDialog->width() / 2, global.y() - waitDialog->height() / 2);
}

... where waitDialog is an instance of my "Wait..." indicator. This needs to override the moveEvent method of the parent (here MyMainWindow).