[1.16.4] How do I prevent items from being placed in certain slots?

[LK1905]

Hi, there are 2 things I want to do:

1. Prevent tiered items from being placed in the offhand slot

2. Prevent armour from being placed in the hotbar

How would I go about doing these things?

[Luis_ST]

9 hours ago, LK1905 said:

1. Prevent tiered items from being placed in the offhand slot

use LivingEquipmentChangeEvent, check if the slot is the Offhand then drop the item, you need to do that because the event is not cancelable

 

9 hours ago, LK1905 said:

2. Prevent armour from being placed in the hotbar

no idea

[LK1905]

Quote

use LivingEquipmentChangeEvent, check if the slot is the Offhand then drop the item, you need to do that because the event is not cancelable

How do I drop the item without cloning it? I've used Player#dropItem (both methods), and it keeps the original in the offhand slot and drops a copy.

I tried using ItemStack#Shrink at the same time, hoping that would destroy the original while still dropping the copy, but that just destroys the original before the copy can be made.

Edited July 4, 2021 by LK1905
Rewrite 2nd paragraph to be clearer

[poopoodice]

Maybe just drop the item before shrinking it?

[LK1905]

I tried that, it made no difference regardless of which line came first.

[Draco18s]

Drop the item, then set the slot to air?

[Luis_ST]

On 7/5/2021 at 1:57 PM, LK1905 said:

I tried that, it made no difference regardless of which line came first.

take a look when the Event is fired, because it's possible that the ItemStack which is given by the Event is a copy of the original,
which means you can't modify the ItemStack in the Event

[LK1905]

Is there any particular reason why LivingEquipmentChangeEvent is non-cancelable? Like, is it a decision by the Forge devs to make it non-cancelable, or is it to do with how Forge interacts with Minecraft, where some things just can't be cancelled?

[Luis_ST]

the event is fired after changing the items, so canceling the event wouldn't have any effects