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[1.16] Backpack item that inventory size changes depending on a certain enchantment level


Zemelua

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I'm trying to make a backpack item that inventory size changes depending on a certain enchantment level. For this reason, I would like to resize the inventory of the item stack when enchantments are granted or cleared. Is there an event that is commonly called for them? Is there no choice but to do enchantments by gold floor, enchantment table, command, etc. at each event? Or should I always check the item's enchantment level and inventory size on every tick?

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@Override
public void inventoryTick(ItemStack stack, World worldIn, Entity entityIn, int itemSlot, boolean isSelected) {
	if (!worldIn.isRemote()) {
		if (stack.getItem() != UMUBackpackItems.BACKPACK.get()) return;
		if (!(entityIn instanceof PlayerEntity)) return;

		IItemHandler inv = stack.getCapability(CapabilityItemHandler.ITEM_HANDLER_CAPABILITY).orElseThrow(RuntimeException::new);
		int size = BackpackItem.getSizeFromLevel(EnchantmentHelper.getEnchantmentLevel(Enchantments.BACKPACK_CAPACITY, stack));

		if (inv.getSlots() == size) return;

		entityIn.sendMessage(new StringTextComponent("slot:" + inv.getSlots()), null);
		entityIn.sendMessage(new StringTextComponent("size:" + size), null);

		NonNullList<ItemStack> oldInv = NonNullList.withSize(inv.getSlots(), ItemStack.EMPTY);
		for (int i = 0; i < inv.getSlots(); i++) {
			oldInv.set(i, inv.getStackInSlot(i));
		}
		((ItemStackHandler) inv).setSize(size);

		for (int i = 0; i < inv.getSlots(); i++) {
			if (i < oldInv.size()) {
				((ItemStackHandler) inv).setStackInSlot(i, oldInv.get(i));
				oldInv.set(i, ItemStack.EMPTY);
			}
		}

		oldInv.forEach((s) -> ((PlayerEntity) entityIn).dropItem(s, true));
	}

	super.inventoryTick(stack, worldIn, entityIn, itemSlot, isSelected);
}

public static int getSizeFromLevel(int level) {
	return 9 * (1 + level);
}

So I want to compare the enchantment level with the current inventory size in Item#inventoryTick and resize the inventory correctly when they don't match. However, whenever I open my backpack inventory, I only see 9 slots. (chat with slot: 9, size: the correct size) I thought that the cause is that the NBT is not updated, but I do not understand the hierarchical structure under ForgeCaps of the NBT in the item stack.

Do you think this is due to NBT? Also, if so, please tell me the structure of capabilities up to NBT.

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    • sorry for the late answer, I tried it but i hadthe same result crash reportlog
    • Your post triggered the anti-spam which hid it from everyone. Please share a *link* to your debug.log and/or crash report on https://paste.ee to avoid this in future so that you don't have to wait so long for help.
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