[1.16] Converting a legacy block after update

[A Soulspark]

After accepting the way I was doing things in my mod wasn't quite ideal, I decided I have to upgrade a certain block when users update into the newest version of my mod.

This block currently has a Content blockstate (an enum with 3 values) and it should convert into a different block for each value. So,

• tea_kettle:kettle[content=empty] -> tea_kettle:empty_kettle
• tea_kettle:kettle[content=water] -> tea_kettle:water_kettle
• tea_kettle:kettle[content=hot_water] -> tea_kettle:boiling_kettle

 

I just don't know how to do that! Maybe I'd need to keep the tea_kettle:kettle block and when it gets instantiated into the world, I immediately run the conversion. But

1. How do I detect a block getting instantiated?
2. Is there a better solution to this?

[Draco18s]

Honestly this is a perfectly valid blockstate block. All three "versions" are a tea_kettle, but with some stateful information (full, empty, hot).

[A Soulspark]

 

  On 3/14/2021 at 10:46 PM, Draco18s said:

Honestly this is a perfectly valid blockstate block. All three "versions" are a tea_kettle, but with some stateful information (full, empty, hot).

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That's true, but an empty kettle doesn't need a tile entity, whereas the other two do, and they have other states that are only necessary in each case.

e.g. the boiling kettle has a fullness state, for how many uses it has left. this isn't necessary for empty or full kettles, as their "fullness" doesn't change: it's 0% or 100%.

 

Plus, each version also has a different item/name/texture, and it was really troublesome to manage all that in a single item and block.

If what I'm trying to do is extremely forbidden, then I could revert ofc. But this just sounds like it makes more sense :v

[kiou.23]

  On 3/15/2021 at 7:12 PM, A Soulspark said:

 

That's true, but an empty kettle doesn't need a tile entity, whereas the other two do, and they have other states that are only necessary in each case.

e.g. the boiling kettle has a fullness state, for how many uses it has left. this isn't necessary for empty or full kettles, as their "fullness" doesn't change: it's 0% or 100%.

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the method hasTileEntity, and createTileEntity, take the current blockstate as a parameter, so you can decide wether or not your block has a tile entity based on the blockstate. that solves this problem

 

blockstates do seem like the easier way to do what you want...

[A Soulspark]

  On 3/15/2021 at 7:30 PM, kiou.23 said:

the method hasTileEntity, and createTileEntity, take the current blockstate as a parameter, so you can decide wether or not your block has a tile entity based on the blockstate. that solves this problem

 

blockstates do seem like the easier way to do what you want...

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ok, I'll try that. but is it possible to have multiple block items for the same block, just with different states? last time I tried this, the Creative inventory got messed up and it just added one of the items multiple times.

 

p.s.: I do need multiple items because there are recipes where only hot kettles can be used.

[Draco18s]

Yes, but you need a custom BlockItem that knows what state needs to be set.

[kiou.23]

  On 3/15/2021 at 8:04 PM, A Soulspark said:

ok, I'll try that. but is it possible to have multiple block items for the same block, just with different states? last time I tried this, the Creative inventory got messed up and it just added one of the items multiple times.

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what comes to mind is that you could extend BlockItem, to make a KettleBlockItem, which places a block with a given blockstate, which you can set when creating a new instance of it in registration... look like the more elegant way of doing it, but I'm really not sure (and after looking at the BlockItem class for a few seconds trying to see wht you could override, I imagine it'd give a headache)

and you could change what item the block drops based on blockstate as well

Edited March 15, 2021 by kiou.23

[A Soulspark]

  On 3/15/2021 at 8:14 PM, Draco18s said:

Yes, but you need a custom BlockItem that knows what state needs to be set.

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  On 3/15/2021 at 8:16 PM, kiou.23 said:

what comes to mind is that you could extend BlockItem, to make a KettleBlockItem, which places a block with a given blockstate, which you can set when creating a new instance of it in registration... look like the more elegant way of doing it, but I'm really not sure (and after looking at the BlockItem class for a few seconds trying to see wht you could override, I imagine it'd give a headache)

and you could change what item the block drops based on blockstate as well

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alright, I think this turned out well. I had already done this "multiple items per block" thing before, but this time I managed to solve the duplicate items in Creative by adding a fillItemGroup() override to my items. I still had to split the blocks into Empty and Water Kettles because I'll later add Milk Kettles too.

Still, it indeed would've been a lot messier if I'd done it with 3 blocks and 2 tile entities lmao. thanks for the guidance!

[Draco18s]

You can get an idea of how I handle it here:

https://github.com/Draco18s/ReasonableRealism/blob/1.14.4/src/main/java/com/draco18s/harderores/HarderOres.java#L134

(I needed to support Silk Touch on a property that made no sense to be separate blocks)

Magic registry stuff (old event-style rather than new DeferredRegister style):

https://github.com/Draco18s/ReasonableRealism/blob/033da26f8ba4bcd25b0911aa9775764f12d7dbbe/src/main/java/com/draco18s/hardlib/EasyRegistry.java#L57

getPickBlock (reg names were dynamic, so this is a bit ugly):
https://github.com/Draco18s/ReasonableRealism/blob/033da26f8ba4bcd25b0911aa9775764f12d7dbbe/src/main/java/com/draco18s/harderores/block/ore/HardOreBlock.java#L80

getStateForPlacement:
https://github.com/Draco18s/ReasonableRealism/blob/033da26f8ba4bcd25b0911aa9775764f12d7dbbe/src/main/java/com/draco18s/harderores/block/ore/HardOreBlock.java#L90

 

I had to do some custom shenanigans for the loot table as well. But if your three items are sensibly named I don't think you need to do much that vanilla doesn't already support. It was just easier for me to write a loot condition that got the blockstate's numerical value and did a lookup on the item than it was to specify a 1:1 relationship in the loot table.

Edited March 16, 2021 by Draco18s