Method MoveItemsToSlot

src/BlockEntities/HopperEntity.cpp:599–645

bool cHopperEntity::MoveItemsToSlot(cBlockEntityWithItems & a_Entity, int a_DstSlotNum)
{
	cItemGrid & Grid = a_Entity.GetContents();
	if (Grid.IsSlotEmpty(a_DstSlotNum))
	{
		// The slot is empty, move the first non-empty slot from our contents:
		for (int i = 0; i < ContentsWidth * ContentsHeight; i++)
		{
			if (!m_Contents.IsSlotEmpty(i))
			{
				if (cPluginManager::Get()->CallHookHopperPushingItem(*m_World, *this, i, a_Entity, a_DstSlotNum))
				{
					// A plugin disagrees with the move
					continue;
				}
				Grid.SetSlot(a_DstSlotNum, m_Contents.GetSlot(i).CopyOne());
				m_Contents.ChangeSlotCount(i, -1);
				return true;
			}
		}
		return false;
	}
	else
	{
		// The slot is taken, try to top it up:
		const cItem & DestSlot = Grid.GetSlot(a_DstSlotNum);
		if (DestSlot.IsFullStack())
		{
			return false;
		}
		for (int i = 0; i < ContentsWidth * ContentsHeight; i++)
		{
			if (m_Contents.GetSlot(i).IsEqual(DestSlot))
			{
				if (cPluginManager::Get()->CallHookHopperPushingItem(*m_World, *this, i, a_Entity, a_DstSlotNum))
				{
					// A plugin disagrees with the move
					continue;
				}
				Grid.ChangeSlotCount(a_DstSlotNum, 1);
				m_Contents.ChangeSlotCount(i, -1);
				return true;
			}
		}
		return false;
	}
}