Add functionality to vanilla blocks

[Yamahari]

Is there a way to add functionality to vanilla blocks, e.g. I am working on a mod that adds weeds that destroy your crops. I want there to be a random chance that everytime a crop grows it can turn into weeds that spread to nearby crops over time. For that I would have to change the tick function of existing block classes. Is there an easy way to do this?

[Yamahari]

Hm, maybe I don't need to edit vanilla blocks if there's an event that fires when crops grow? Is there such an event? This is in Forge 1.13.2 btw

Edited May 28, 2019 by Yamahari

[Draco18s]

CropGrowEvent

 

I don't know if its been added to the 1.13 codebase yet, but I added it to 1.12 a while back, so it should get moved forward soon, if it hasn't been already.

[Yamahari]

Yes! That worked just fine. I subscribed to CropGrowEvent.Post and now my weeds spread like wildfire x) 

The problem now arises at a different point though. I want to change the way bonemeal works, but I can't edit the ItemBoneMeal class. Would it be best to make my own custom BoneMeal class and place that in all the recipes where normal bonemeal would needed? Or is there a way simpler way I am missing. 

Edited May 28, 2019 by Yamahari

[Yamahari]

Well there's also a BoneMealEvent event x) and my next question would have been how I can change the functionality of the Hoe, but who would have thought, there is an UseHoeEvent! 

[DavidM]

If you need to modify the behavior of a vanilla Item/Block, you could also create your own version of the Item/Block and replace the vanilla one with it.

This might be useful if there is no event for the behavior you would like to modify.

An example of this is done in FastWorkbench, where the author created a new crafting table and replaced the vanilla one with it.

Edited May 29, 2019 by DavidM

[Draco18s]

You might also want to check out my farming mod:

https://github.com/Draco18s/ReasonableRealism/tree/1.12.1/src/main/java/com/draco18s/farming

Code is still 1.12, but everything should still be possible. I did weeds and bonemeal and hoe modifications too.

[Yamahari]

6 hours ago, DavidM said:

If you need to modify the behavior of a vanilla Item/Block, you could also create your own version of the Item/Block and replace the vanilla one with it.

This might be useful if there is no event for the behavior you would like to modify.

An example of this is done in FastWorkbench, where the author created a new crafting table and replaced the vanilla one with it.

Is replacing vanilla blocks and items considered good practice?

5 hours ago, Draco18s said:

You might also want to check out my farming mod:

https://github.com/Draco18s/ReasonableRealism/tree/1.12.1/src/main/java/com/draco18s/farming

Code is still 1.12, but everything should still be possible. I did weeds and bonemeal and hoe modifications too.

I like the way you did the spreading of weeds ! But my plan with bonemeal is to make it impossible to use on crops. You now have to bonemeal the ground before you can plant anything, basically adding a nutrition property to farmland that gets removed once a crop on it has grown to max age.

[Yamahari]

9 hours ago, DavidM said:

If you need to modify the behavior of a vanilla Item/Block, you could also create your own version of the Item/Block and replace the vanilla one with it.

This might be useful if there is no event for the behavior you would like to modify.

An example of this is done in FastWorkbench, where the author created a new crafting table and replaced the vanilla one with it.

It seems like you can no longer do that in 1.13.2, I get runtime exception with the message "Illegal replacement of vanilla ... "

[Draco18s]

7 hours ago, Yamahari said:

I like the way you did the spreading of weeds ! But my plan with bonemeal is to make it impossible to use on crops. You now have to bonemeal the ground before you can plant anything, basically adding a nutrition property to farmland that gets removed once a crop on it has grown to max age.

Its been a long time, but I was pretty sure I messed with bonemeal use too, but I can't find it now.

You should still be able to hook into the Bonemeal events and cancel it, preventing their usage on crops.

[Daeruin]

Replacing vanilla blocks is sometimes necessary if there's no event that will let you achieve the behavior you want. It can decrease mod compatibility if other mods are modifying or replacing the same block as you, so try to use events first.