How to grab a qwidget /render it in a pixmap everytime it needs to be repainted?

Question

I have a QWidget that I don\'t want to show on screen. Instead I want to get a pixmap of the widget every time it is repainted, in order to send it to another part of the ap

Answer 1

As another way - you can do next check:

void paintEvent(QPaintEvent*)
{
  QPainter painter(this);
  // If painter redirection was turned on, the painter will *not* paint on `this`!
  // Painting code
  //...
  if ( this == qobject_cast< QWidget * >( painter.device() ) )
  {
    // Do grabbing
  }
}

paintEvent is called both for painting on widget and on grabbing. painter->device() will return not null, but instance of QWidget * object only when current painting is on widget. In case of drawing on QPixmap - it will return QPixmap *. So you need to call grabbing code only when painting is performed only on real widget.