Method mouseReleaseEvent

ImagePlay/src/IPProcessStep.cpp:421–507

! * \brief IPProcessStep::mouseReleaseEvent * \param event */

 * \param event
 */
void IPProcessStep::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
{
    IPProcessGridScene* scn = (IPProcessGridScene*) scene();

    // bring the items to the background again
    setZValue(0);
    if(scene()->selectedItems().length() > 1)
    {
        for(int i=0; i < scene()->selectedItems().length(); i++)
        {
            IPProcessStep* item = (IPProcessStep*) scene()->selectedItems().at(i);
            item->setZValue(0);
        }
    }

    // check for items for connection
    if(_connecting)
    {
        // there is currently only 1 view
        QGraphicsView* view = scn->views()[0];
        // transform is needed because of zooming capabilities
        QGraphicsItem* tmpItem = scn->itemAt(event->scenePos(), view->transform());
        if(tmpItem && typeid(*tmpItem) == typeid(IPProcessStep))
        {
            IPProcessStep* otherItem = (IPProcessStep*) tmpItem;
            if(process()->availableOutputs() > 0 && otherItem->process()->availableInputs() > 0)
            {

                // if source or destination have multiple inputs/outputs show connection dialog
                if(process()->outputs()->size() > 1 || otherItem->process()->inputs()->size() > 1)
                {
                    ConnectionDialog* connectionDialog = new ConnectionDialog(this, otherItem, scn, _mainWindow);
                    connectionDialog->show();
                }
                else
                {
                    _mainWindow->addEdge(new IPProcessEdge(this, otherItem, 0, 0));
                }
            }

        }
        _connecting = false;

        ((IPProcessGridScene*) scene())->setTmpArrowVisible(false);
        return;
    }

    // snap after dragging
    snapToGrid();

    // snap all if multiselect
    bool groupIsColliding = false;
    if(scene()->selectedItems().length() > 0)
    {
        for(int i=0; i < scene()->selectedItems().length(); i++)
        {
            IPProcessStep* item = (IPProcessStep*) scene()->selectedItems().at(i);
            for(QGraphicsItem* currentItem : item->collidingItems())