ModEventSubscriber.java

/**
 * The class that subscribes the event to trigger inter mod communication for registering slot types.
 */
package potatocult.curios_support;

import net.minecraft.block.Block;
import net.minecraft.block.EnderChestBlock;
import net.minecraft.item.ItemStack;
import net.minecraft.util.Direction;
import net.minecraftforge.common.MinecraftForge;
import net.minecraftforge.common.capabilities.Capability;
import net.minecraftforge.common.capabilities.ICapabilityProvider;
import net.minecraftforge.common.util.LazyOptional;
import net.minecraftforge.event.AttachCapabilitiesEvent;
import net.minecraftforge.eventbus.api.SubscribeEvent;
import net.minecraftforge.fml.InterModComms;
import net.minecraftforge.fml.common.Mod;
import net.minecraftforge.fml.event.lifecycle.InterModEnqueueEvent;
import net.minecraftforge.fml.javafmlmod.FMLJavaModLoadingContext;
import top.theillusivec4.curios.api.CuriosAPI;
import top.theillusivec4.curios.api.capability.CuriosCapability;
import top.theillusivec4.curios.api.capability.ICurio;
import top.theillusivec4.curios.api.imc.CurioIMCMessage;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

public class ModEventSubscriber extends CuriosSupportExampleModElements.ModElement {
    /**
     * Constructor. Also registers the Enqueue IMC event and the attachCapabilities event.
     */
    public ModEventSubscriber(CuriosSupportExampleModElements instance) {
        super(instance, 1);
        FMLJavaModLoadingContext.get().getModEventBus().addListener(this::enqueueIMC);
        MinecraftForge.EVENT_BUS.addGenericListener(ItemStack.class, this::attachCapabilities);
    }

    /**
     * Sends inter mod communication to Curios to register slot types.
     * In 99% of cases you should use slot types here: https://github.com/TheIllusiveC4/Curios/wiki/Frequently-Used-Slots
     * If you don't use those slot types, the slot won't have a default icon and you would need to register one yourself!
     * @param event The Enqueue IMC event.
     * This has to be here to register the curio slots
     */
    private void enqueueIMC(final InterModEnqueueEvent event) {
        InterModComms.sendTo(CuriosAPI.MODID, CuriosAPI.IMC.REGISTER_TYPE, () -> new CurioIMCMessage("ring").setSize(1).setEnabled(true).setHidden(false));
        InterModComms.sendTo(CuriosAPI.MODID, CuriosAPI.IMC.REGISTER_TYPE, () -> new CurioIMCMessage("back").setSize(1).setEnabled(true).setHidden(false));
    }

	/**
	 *
	 * Attach capabilities for {@link potatocult.curios_support.CurioEnderChest}
	 */

    @SubscribeEvent
    public void attachCapabilities(AttachCapabilitiesEvent<ItemStack> event) {
        ItemStack stack = event.getObject();
        Block block = EnderChestBlock.getBlockFromItem(stack.getItem());

        CurioEnderChest curioEnderChest = new CurioEnderChest(stack);

        event.addCapability(CuriosCapability.ID_ITEM, new ICapabilityProvider() {
            final LazyOptional<ICurio> curio = LazyOptional.of(() -> curioEnderChest);

            @Nonnull
            @Override
            public <T> LazyOptional<T> getCapability(@Nonnull Capability<T> cap,
                                                     @Nullable Direction side) {
                return CuriosCapability.ITEM.orEmpty(cap, curio);
            }
        });

    }
}