Items at a specific slot in ItemGroups

[prime tinsel]

Hello, how can I make it so items are at a specific slot in a ItemGroup? I've seen mods like Ad Astra having smth like this.

[jovial gazelle]

You can provide a reference item from vanilla and add your item after that item

[prime tinsel]

How do I do that?

[copper dawn]

For FabricItemGroupEntries you can entries.addAfter((ItemConvertible) item, List.of((ItemStack) stack), visibility) with the list of the stack being the item added after the specified item.

[prime tinsel]

I don't understand what you mean with that.

[copper dawn]

When registering items for your mod you can use the addAfter method in your listener to position the item after a reference item from vanilla.
So for example you add a custom sword item after the diamond sword in the combat item group.
on initialize run

private static void addItemsToCombatItemGroup(FabricItemGroupEntries entries)  {
    entries.addAfter(Items.DIAMOND_SWORD, CUSTOM_SWORD);
}```

[prime tinsel]

but that only adds the item after another item, in the ad astra mod there is a empty slots inbetween the items

something like this

[jovial gazelle]

https://github.com/terrarium-earth/Ad-Astra/blob/1.20.x/common/src/main/java/earth/terrarium/adastra/common/registry/ModCreativeTab.java

i don't know exactly how they did it, but you can read through it and look.

[prime tinsel]

alr i'll see, ty

[jovial gazelle]

please do remember the licence should you chose to reuse code

[prime tinsel]

ye, but i still don't understand how they did it

[jovial gazelle]

idk either

[copper dawn]

They seem to use a library to create a custom creative mode tab, namely com.teamresourceful.resourcefullib.common.item.tabs.ResourcefulCreativeTab. So I guess you could investigate that.

[prime tinsel]

alright i'll try

[jovial gazelle]

https://github.com/Team-Resourceful/ResourcefulLib/blob/1.21.x/fabric/src/main/java/com/teamresourceful/resourcefullib/common/item/tabs/fabric/ResourcefulCreativeModeTabImpl.java

[prime tinsel]

still don't understand it, i don't even find any tutorials on how to use the library :/

[jovial gazelle]

I don't see anything that would cause the effect you mentioned

[prime tinsel]

wdym

[jovial gazelle]

Idk how they did it. What version is this screenshot from?

[prime tinsel]

the screenshot is 1.18.2 and im trying to do 1.21

[jovial gazelle]

There is your answer then.

[jovial gazelle]

https://github.com/terrarium-earth/Ad-Astra/blob/1.18.x/src/main/java/com/github/alexnijjar/ad_astra/registry/ModItemGroups.java

[prime tinsel]

I guess i didn't look long enough, thanks