/// Moves items from the specified ItemGrid into this hopper. Returns true if contents have changed.
bool cHopperEntity::MoveItemsFromGrid(cItemGrid & a_Grid)
{
int NumSlots = a_Grid.GetNumSlots();
// First try adding items of types already in the hopper:
for (int i = 0; i < NumSlots; i++)
{
if (a_Grid.IsSlotEmpty(i))
{
continue;
}
if (MoveItemsFromSlot(a_Grid.GetSlot(i), false))
{
a_Grid.ChangeSlotCount(i, -1);
return true;
}
}
// No already existing stack can be topped up, try again with allowing new stacks:
for (int i = 0; i < NumSlots; i++)
{
if (a_Grid.IsSlotEmpty(i))
{
continue;
}
if (MoveItemsFromSlot(a_Grid.GetSlot(i), true))
{
a_Grid.ChangeSlotCount(i, -1);
return true;
}
}
return false;
}
/// Moves one piece to the specified ItemGrid's slot. Returns true if contents have changed.
bool cHopperEntity::MoveItemsToSlot(cItemGrid & a_ItemGrid, int a_DestSlotNum)
{
if (a_ItemGrid.IsSlotEmpty(a_DestSlotNum))
{
// 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))
{
a_ItemGrid.SetSlot(a_DestSlotNum, 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 = a_ItemGrid.GetSlot(a_DestSlotNum);
if (DestSlot.IsFullStack())
{
return false;
}
for (int i = 0; i < ContentsWidth * ContentsHeight; i++)
{
if (m_Contents.GetSlot(i).IsStackableWith(DestSlot))
{
a_ItemGrid.ChangeSlotCount(a_DestSlotNum, 1);
m_Contents.ChangeSlotCount(i, -1);
return true;
}
}
return false;
}
}
