Stuff

size_t desktopDx = QApplication::desktop()->width();
   size_t desktopDy = QApplication::desktop()->height();
   size_t windowDx = uiPass.width();
   size_t windowDy = uiPass.height();
   uiPass.setGeometry((desktopDx-windowDx)/2, (desktopDy-windowDy)/2,windowDx, windowDy);