Drawing a selection rectangle

[zarkzervo]

I have this in my inherited GraphicsScene:

void MyGraphicsScene::mousePressEvent ( QGraphicsSceneMouseEvent * event )
{
  event->ignore();
 
  // Reset selectionArea
  setSelectionArea(QPainterPath());
 
  // Always remember to call parents mousePressEvent
  QGraphicsScene::mousePressEvent(event);
}

void MyGraphicsScene::mousePressEvent ( QGraphicsSceneMouseEvent * event )
{
  event->ignore();

  // Reset selectionArea
  setSelectionArea(QPainterPath());

  // Always remember to call parents mousePressEvent
  QGraphicsScene::mousePressEvent(event);
}

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and

void MyGraphicsScene::mouseReleaseEvent ( QGraphicsSceneMouseEvent * event )
{
  event->ignore();
 
  bool ctrl = (event->modifiers() == Qt::ControlModifier);
 
  QPainterPath tmpPath = selectionArea();
  if(tmpPath.isEmpty())
  {
    // if ctrl pressed, then toggle selection
    emit select(event->scenePos(), ctrl);
  }
  else
  {
    // if ctrl pressed, then add selection
    emit select(tmpPath, ctrl);
  }
 
  // Always remember to call parents mousePressEvent
  QGraphicsScene::mouseReleaseEvent(event);
 
}

void MyGraphicsScene::mouseReleaseEvent ( QGraphicsSceneMouseEvent * event )
{
  event->ignore();

  bool ctrl = (event->modifiers() == Qt::ControlModifier);

  QPainterPath tmpPath = selectionArea();
  if(tmpPath.isEmpty())
  {
    // if ctrl pressed, then toggle selection
    emit select(event->scenePos(), ctrl);
  }
  else
  {
    // if ctrl pressed, then add selection
    emit select(tmpPath, ctrl);
  }

  // Always remember to call parents mousePressEvent
  QGraphicsScene::mouseReleaseEvent(event);

}

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I just inherited QGraphicsScene locally just to re-implement these two functions. This is the complete code I use in these two functions. You may not need all, but what I do, is to emit the signal with the path (selection rectangle) and if the user has pressed ctrl (adding elements)

Hope this helps and I didn't misunderstand your question.

[Caius Aérobus]

Hope this helps and I didn't misunderstand your question.

You didn't but since I do not use QGraphicsScene...