Question

Assume that I have a QPushButton, if I pressed the button, then I will show a QFrame. When the button is close to the edge of the screen, some part of the QFrame can’t be seen. How to make sure the QFrame is out of window?

Answer 1

I hope you need following detection method for QWidget in general..

bool IsOutOfDesktop(QWidget *w)
{
    QDesktopWidget *desktopWidget = QApplication::desktop();
    QRect screenRect = desktopWidget->screenGeometry(&w);
    QPoint topLeft = w.mapToGlobal(w.geometry().topLeft());
    QPoint bottomRight = w.mapToGlobal(w.geometry().bottomRight());

   if(!screenRect.contains(topLeft) || !screenRect.contains(bottomRight))
        return true;

   return false;
}