Shipment::onBasketModify

public function onBasketModify($action, BasketItem $basketItem, $name = null, $oldValue = null, $value = null)
{
	$result = new Result();

	if ($action === EventActions::ADD)
	{
		if (!$this->isSystem())
		{
			return $result;
		}

		return $this->getShipmentItemCollection()->onBasketModify($action, $basketItem, $name, $oldValue, $value);
	}
	elseif ($action === EventActions::UPDATE)
	{
		if ($name === "QUANTITY")
		{
			if ($this->isSystem())
			{
				return $this->syncQuantityAfterModify($basketItem, $value, $oldValue);
			}

			/** @var ShipmentItemCollection $shipmentItemCollection */
			$shipmentItemCollection = $this->getShipmentItemCollection();

			$r = $shipmentItemCollection->onBasketModify($action, $basketItem, $name, $oldValue, $value);
			if ($r->isSuccess())
			{
				if (!$this->isCustomPrice())
				{
					$deliveryCalculate = $this->calculateDelivery();
					if ($deliveryCalculate->isSuccess())
					{
						$this->setField('BASE_PRICE_DELIVERY', $deliveryCalculate->getPrice());
					}
					else
					{
						$result->addWarnings($deliveryCalculate->getErrors());
					}
				}
			}
			else
			{
				$result->addErrors($r->getErrors());
			}
		}
		elseif ($name === 'WEIGHT')
		{
			if (!$this->isMarkedFieldCustom('WEIGHT'))
			{
				if ($this->getShipmentItemCollection()->isExistBasketItem($basketItem))
				{
					$this->setField('WEIGHT', $this->getShipmentItemCollection()->getWeight());
				}
			}
		}
		elseif ($name === 'PRICE')
		{
			if (!$this->isCustomPrice())
			{
				if ($this->getShipmentItemCollection()->isExistBasketItem($basketItem))
				{
					$r = $this->calculateDelivery();
					if ($r->isSuccess())
					{
						$this->setField('BASE_PRICE_DELIVERY', $r->getPrice());
					}
					else
					{
						$result->addErrors($r->getErrors());
					}
				}
			}
		}
	}

	return $result;
}