public void OnDrop(PointerEventData eventData)
{
Transform droppedItem = eventData.pointerDrag.transform;
ItemData droppedData = droppedItem.GetComponent <ItemData>();
if (!inv.isOutput && droppedData != null)
{
if (inv.items[slotNum].ID == -1) // The slot is empty, move the dragged item.
{
if (!droppedData.CheckSplitStack())
{
droppedData.inv.items[droppedData.slot] = new Item();
}
inv.items[slotNum] = droppedData.item;
droppedData.slot = slotNum;
droppedData.inv = inv;
}
else if (droppedData.slot != slotNum || droppedData.inv != inv)
{ // The slot is occupied, decide what to do with the existing item.
Transform existingItem = transform.GetChild(1);
itemData = existingItem.GetComponent <ItemData>();
bool split = droppedData.CheckSplitStack();
if (droppedData.item.Stackable && (droppedData.item.ID == itemData.item.ID || split))
{
if (droppedData.item.ID == itemData.item.ID)
{ // Combine the item stacks.
if (!split)
{
droppedData.inv.items[droppedData.slot] = new Item();
}
itemData.amount += droppedData.amount;
itemData.UpdateAmountDisplay();
Destroy(droppedItem.gameObject);
}
else if (split)
{ // Replace the item stack.
ItemData residualData = droppedData.GetResidualData();
residualData.amount += droppedData.amount;
residualData.UpdateAmountDisplay();
Destroy(droppedItem.gameObject);
}
}
else if (!droppedData.inv.isOutput)
{ // Items need to be swapped.
// Change swapped item's slot, inv, and position references to the dropped item's, and add it to the dropped item's original inventory.
itemData.slot = droppedData.slot;
itemData.inv = droppedData.inv;
itemData.inv.items[droppedData.slot] = itemData.item;
existingItem.transform.SetParent(itemData.inv.slots[droppedData.slot].transform);
existingItem.transform.position = itemData.inv.slots[droppedData.slot].transform.position;
// Change dropped item's slot, inv, and position references, and add it to this slot's inventory.
droppedData.slot = slotNum;
droppedData.inv = inv;
droppedData.inv.items[droppedData.slot] = droppedData.item;
droppedData.transform.SetParent(transform);
droppedData.transform.position = transform.position;
itemData = droppedData;
}
}
}
}