void Connection::mouseReleaseEvent(QGraphicsSceneMouseEvent *event) { QGraphicsObject::mouseReleaseEvent(event); if (drag_state == CONNECTED) return; ungrabMouse(); clearFocus(); setFlag(QGraphicsItem::ItemIsFocusable, false); InputPort* t = gscene()->getInputPortAt(endPos()); Datum* datum = target ? target->getDatum() : NULL; if (t && datum->acceptsLink(source->getDatum())) { target = t; t->install(this); datum->installLink(source->getDatum()); drag_state = CONNECTED; App::instance()->pushStack( new UndoAddLinkCommand(source->getDatum(), datum)); onPortsMoved(); emit(changed()); } else { deleteLater(); } prepareGeometryChange(); }