Function locateNodeAt

QtNodeEditor/src/FlowScene.cpp:618–651

{

Node*
locateNodeAt(QPointF scenePoint, FlowScene &scene,
             QTransform const & viewTransform)
{
  // items under cursor
  QList<QGraphicsItem*> items =
    scene.items(scenePoint,
                Qt::IntersectsItemShape,
                Qt::DescendingOrder,
                viewTransform);

  //// items convertable to NodeGraphicsObject
  std::vector<QGraphicsItem*> filteredItems;

  std::copy_if(items.begin(),
               items.end(),
               std::back_inserter(filteredItems),
               [] (QGraphicsItem * item)
    {
      return (dynamic_cast<NodeGraphicsObject*>(item) != nullptr);
    });

  Node* resultNode = nullptr;

  if (!filteredItems.empty())
  {
    QGraphicsItem* graphicsItem = filteredItems.front();
    auto ngo = dynamic_cast<NodeGraphicsObject*>(graphicsItem);

    resultNode = &ngo->node();
  }

  return resultNode;
}
}