InventoryCommandsImplementation.java 文件源码

static void combineSlots(EntityPlayerMP player, int dst, int add)
{
    InventoryPlayer inv = player.inventory;
    ItemStack dstStack = inv.getStackInSlot(dst);
    ItemStack addStack = inv.getStackInSlot(add);

    if (addStack == null)
        return;    // Combination is a no-op.

    if (dstStack == null)   // Do a straight move - nothing to combine with.
    {
        inv.setInventorySlotContents(dst, addStack);
        inv.setInventorySlotContents(add, null);
        return;
    }

    // Check we can combine. This logic comes from InventoryPlayer.storeItemStack():
    boolean itemsMatch = dstStack.getItem() == addStack.getItem();
    boolean dstCanStack = dstStack.isStackable() && dstStack.stackSize < dstStack.getMaxStackSize() && dstStack.stackSize < inv.getInventoryStackLimit();
    boolean subTypesMatch = !dstStack.getHasSubtypes() || dstStack.getMetadata() == addStack.getMetadata();
    boolean tagsMatch = ItemStack.areItemStackTagsEqual(dstStack, addStack);
    if (itemsMatch && dstCanStack && subTypesMatch && tagsMatch)
    {
        // We can combine, so figure out how much we have room for:
        int limit = Math.min(dstStack.getMaxStackSize(), inv.getInventoryStackLimit());
        int room = limit - dstStack.stackSize;
        if (addStack.stackSize > room)
        {
            // Not room for all of it, so shift across as much as possible.
            addStack.stackSize -= room;
            dstStack.stackSize += room;
        }
        else
        {
            // Room for the whole lot, so empty out the add slot.
            dstStack.stackSize += addStack.stackSize;
            inv.setInventorySlotContents(add, null);
        }
    }
}