Method decreaseByValue

src/Basescape/TransferItemsState.cpp:661–698

* Decreases the quantity of the selected item to transfer by "change". * @param change How much we want to remove. */

 * @param change How much we want to remove.
 */
void TransferItemsState::decreaseByValue(int change)
{
	const enum TransferType selType = getType(_sel);
	if (0 >= change || 0 >= _transferQty[_sel]) return;
	Craft *craft = 0;
	change = std::min(_transferQty[_sel], change);
	// Personnel count
	if (TRANSFER_SOLDIER == selType || TRANSFER_SCIENTIST == selType || TRANSFER_ENGINEER == selType)
	{
		_pQty -= change;
	}
	// Craft count
	else if (TRANSFER_CRAFT == selType)
	{
		craft = _crafts[_sel - _soldiers.size()];
		_cQty--;
		_pQty -= craft->getNumSoldiers();
		_iQty -= craft->getItems()->getTotalSize(_game->getRuleset());
	}
	// Item count
	else if (TRANSFER_ITEM == selType)
	{
		const RuleItem * selItem = _game->getRuleset()->getItem(_items[getItemIndex(_sel)]);
		if (!selItem->getAlien())
		{
			_iQty -= selItem->getSize() * change;
		}
		else
		{
			_aQty -= change;
		}
	}
	_baseQty[_sel] += change;
	_transferQty[_sel] -= change;
	if (!Options::canTransferCraftsWhileAirborne || 0 == craft || craft->getStatus() != "STR_OUT")
		_total -= getCost() * change;
	updateItemStrings();
}

/**
 * Updates the quantity-strings of the selected item.