[1.10.2] Disabling crafting recipe for certain players

[Bloopers]

Basically, I want to make it so you need to have researched about a specific item before you can "know" how to craft it. I can't find a similar question anywhere and I have no idea where to start. I assume I'll be using forge events to detect if the player actually crafted the item. Which should be simple. But then... making it so there's no output... that'll probably be a bit more difficult. So yeah, any pointers would be helpful. I think I've got a decent grasp on the whole java stuff so I don't need like super detailed explanations... I think.

[AnZaNaMa]

Seems like what you're going to be looking for is the PlayerEvent.ItemCraftedEvent, which apparently is called just before a player crafts an item. Unfortunately, it seems that this event is not @Cancelable, so you'll have to manually stop the crafting from happenning.

[Bloopers]

8 minutes ago, AnZaNaMa said:

Seems like what you're going to be looking for is the PlayerEvent.ItemCraftedEvent, which apparently is called just before a player crafts an item. Unfortunately, it seems that this event is not @Cancelable, so you'll have to manually stop the crafting from happenning.

How can it be "manually" stopped?

[AnZaNaMa]

Not sure if there is a good way to do it currently. Looking back at older posts, it seems that previously you had to do it via reflection. I don't understand why they couldn't just add @Cancelable to the event but maybe it broke something.

[Draco18s]

12 minutes ago, AnZaNaMa said:

Not sure if there is a good way to do it currently. Looking back at older posts, it seems that previously you had to do it via reflection. I don't understand why they couldn't just add @Cancelable to the event but maybe it broke something.

Cancelable means that where the event is used, the code queries if the event was actually cancelled before continuing on with the operation.

In this case, it isn't cancelable because it's an event informing other code "hey, this happened." It's too late to do anything about it.

[AnZaNaMa]

Oh okay. Is there a reason this couldn't be changed by forge? It seems like forge changes plenty of other things in Minecraft. Maybe it just isn't worth it? 

[Draco18s]

It's a Forge event.

So no, its not likely to be changed.

[jabelar]

InI 1.12 with the JSON approach you can do conditional recipes. It wasn't clear if you wanted to do this for your own recipes or also for vanilla. In the first place you would just create conditional recipes, and in the latter case you would replace the vanilla recipes (which are now in a registry) with your own. 

 

I have tutorial tip information that covers this in more detail here: http://jabelarminecraft.blogspot.com/p/minecraft-modding-ore-dictionary.html look halfway down the page to the sections regarding replacing recipes and conditional recipes.

 

I know you wanted to do it in 1.10, but maybe you should consider doing it in 1.12.

Edited September 30, 2017 by jabelar

[jabelar]

I also had another idea. Maybe you could just use the GuiOpen event to intercept the various crafting GUIs and replace the GUI with your own and add the code you need to check player and prevent recipes.

[AnZaNaMa]

@jabelar I just want to take a minute to say that your tutorials are amazing. They're super descriptive and give all the information you need and more. I appreciate what you've done. It's a great contribution to the community.