Menu key and widgets embedded in a graphics view

// --------------------------------------
#include <QApplication>
#include <QGraphicsView>
#include <QGraphicsProxyWidget>
#include <QLineEdit>

int main (int argc, char **argv)
{
  QApplication app (argc, argv);

  QGraphicsView *view = new QGraphicsView;
  QGraphicsScene *scene = new QGraphicsScene;

  scene->setSceneRect (0, 0, 100, 100);
  view->setScene (scene);

  QGraphicsProxyWidget *pw = new QGraphicsProxyWidget;
  pw->setWidget (new QLineEdit);
  scene->addItem (pw);

  view->show ();

  int res = app.exec ();

  delete view;
  delete scene;

  return res;
}
// --------------------------------------