Method undo

src/domain/UBGraphicsItemUndoCommand.cpp:88–185

}

void UBGraphicsItemUndoCommand::undo()
{
    if (!mScene){
        return;
    }

    QSetIterator<QGraphicsItem*> itAdded(mAddedItems);
    while (itAdded.hasNext())
    {
        QGraphicsItem* item = itAdded.next();

        UBApplication::boardController->freezeW3CWidget(item, true);
        item->setSelected(false);

        QTransform t;
        bool bApplyTransform = false;
        UBGraphicsPolygonItem *polygonItem = qgraphicsitem_cast<UBGraphicsPolygonItem*>(item);
        if (polygonItem){
            if (polygonItem->strokesGroup()
                    && polygonItem->strokesGroup()->parentItem()
                    && UBGraphicsGroupContainerItem::Type == polygonItem->strokesGroup()->parentItem()->type())
            {
                bApplyTransform = true;
                t = polygonItem->sceneTransform();
            }
            else if (polygonItem->strokesGroup())
                polygonItem->resetTransform();

            polygonItem->strokesGroup()->removeFromGroup(polygonItem);
        }
        mScene->removeItem(item);

        if (bApplyTransform)
            polygonItem->setTransform(t);

    }

    QSetIterator<QGraphicsItem*> itRemoved(mRemovedItems);
    while (itRemoved.hasNext())
    {
        QGraphicsItem* item = itRemoved.next();
        if (item)
        {
            if (itemLayerType::BackgroundItem == item->data(UBGraphicsItemData::itemLayerType))
                mScene->setAsBackgroundObject(item);
            else
                mScene->addItem(item);

            if (UBGraphicsPolygonItem::Type == item->type())
            {
                UBGraphicsPolygonItem *polygonItem = qgraphicsitem_cast<UBGraphicsPolygonItem*>(item);
                if (polygonItem)
                {
                    mScene->removeItem(polygonItem);
                    mScene->removeItemFromDeletion(polygonItem);
                    polygonItem->strokesGroup()->addToGroup(polygonItem);
                }
            }