Question

I am trying to catch the signal that indicates that the user has used the rubberband to select a region. I tried this:

  QGraphicsScene* scene = new QGraphicsScene();

  connect(scene, SIGNAL(selectionChanged()), this, SLOT(SelectionChanged()));
  this->graphicsView->setScene(scene);
  this->graphicsView->setDragMode(QGraphicsView::RubberBandDrag);

but my SelectionChanged() slot is never called. Any ideas how to do this?

Answer 1

In order the signal selectionChanged to be emitted whenever some items in the scene get selected. In order to get selected the flag QGraphicsItem::ItemIsSelectable should have been set.

Are you sure the items are selectable?