[SOLVED] Event for Items dropped by Dispenser?

[Rurido]

Hi.

I searched for an event that is triggered when a dispenser throws an item. I got the following, but it is not quite what I wanted, because here I can't prevent the item from being dispensed:

@Mod.EventBusSubscriber
public class EventHandler {
	/*some stuff*/
	@SubscribeEvent
	public static void onBlock(BlockEvent ev) {
		World world = ev.getWorld();
		BlockPos blockPos = ev.getPos();
		IBlockState iBlockState = world.getBlockState(blockPos);
      
		if(iBlockState.getBlock() instanceof BlockDispenser){
			if(iBlockState.getValue(BlockDispenser.TRIGGERED)){
				ChatHelper.sendChatMsgToAllPlayers(ev.getWorld().getMinecraftServer(), "Dispenser fired!");
				/*prevent drop | hook own routine*/
			}
		}
	}
}

Any Idea how to stop the item from being dropped / which event to use instead? This all has to happen @ server side...

Thanks in advance, Rurido.

Edited November 8, 2017 by Rurido

[Draco18s]

The dispenser does not fire any event, of any kind, when it dispenses items. The BlockEvent class (and its subclasses) are for events like crops growing, blocks being placed, blocks being broken, etc. They are very specific (I do not believe that BlockEvent is used in any context except via its subclasses). Also, if you look at BlockDispenser and the dispense method, you'll see that no events are posted.

 

If you want to change how the dispenser dispenses items, you can do that by adding and removing entries to the DISPENSE_BEHAVIOR_REGISTRY

Edited November 6, 2017 by Draco18s

[Rurido]

1 hour ago, Draco18s said:

The dispenser does not fire any event, of any kind, when it dispenses items. [...]

 

If you want to change how the dispenser dispenses items, you can do that by adding and removing entries to the DISPENSE_BEHAVIOR_REGISTRY

Thanks for the advice. It works now!

Just to be sure, is everything as it should be?

@Mod(modid = Main.MODID, version = Main.VERSION)
public class Main {
  	/*init stuff*/
	@EventHandler
	public static void postInit(FMLPostInitializationEvent event){
		RecipeManager.initDispenserBehavior();
	}
}

public class RecipeManager {
  	/*some stuff*/
	public void initDispenserBehavior(){
		BlockDispenser.DISPENSE_BEHAVIOR_REGISTRY.putObject(Items.WHEAT_SEEDS, new BehaviorPlaceBlock(Blocks.WHEAT, 1, 4));
		/*more stuff*/
	}
}

public class BehaviorPlaceBlock implements IBehaviorDispenseItem {
	
	protected final IBlockState iBlockState;
	protected int offset = 1;
	protected int maxRange = 1;

	public BehaviorPlaceBlock(Block blockToPlace, int offset, int maxRange){
		iBlockState = blockToPlace.getDefaultState();
		this.offset = offset;
		this.maxRange = maxRange;
	}

	@Override
	public ItemStack dispense(IBlockSource source, ItemStack stack) {
		/*do some stuff*/
	}
}

 

Edited November 6, 2017 by Rurido

[Draco18s]

I think so.

You're also removing any existing behavior for items you're adding behaviors for, yes? (If applicable)

(Aside from the default "toss").

[Rurido]

As far as I know, my behaviors use items with no behavior in (vanilla) Minecraft, so no, I don't remove any behaviors.

Should I remove a behavior provisionally before I add it to make sure it is compatible with other mods?

[Draco18s]

You should be fine, it's just that if you wanted to override a behavior (e.g. making water buckets do something different) you'd have to remove the existing behavior.

[Rurido]

Good to know, but that was nothing I wanted to do. Like my little piece of code showed I simply added some placement rules for seeds in dispensers.

But anyways, thank you!

PS: Do threads get closed here? I think this would be the right point to do so ^^

Edited November 7, 2017 by Rurido

[larsgerrits]

17 hours ago, Rurido said:

PS: Do threads get closed here? I think this would be the right point to do so ^^

Some people change the title of the first post to contain [SOLVED].

[Rurido]

18 hours ago, larsgerrits said:

Some people change the title of the first post to contain [SOLVED].

Good to know. I did so now.