How to center main window on screen?

[viulskiez]

Simply move the window to center then show it. This can be done by calling QWidget::show() then QWidget::move(int, int) or QWidget::move(const QPoint&). You can access information about current desktop screen geometry from QApplication::desktop()->screenGeometry().
The implementation should be like this.

QRect screenGeometry = QApplication::desktop()->screenGeometry();
int x = (screenGeometry.width()-mainWindow->width()) / 2;
int y = (screenGeometry.height()-mainWindow->height()) / 2;
mainWindow->move(x, y);
mainWindow->show();

QRect screenGeometry = QApplication::desktop()->screenGeometry();
int x = (screenGeometry.width()-mainWindow->width()) / 2;
int y = (screenGeometry.height()-mainWindow->height()) / 2;
mainWindow->move(x, y);
mainWindow->show();

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