Package net.neoforged.neoforge.common.extensions

Interface IItemExtension

All Known Implementing Classes:
AirItem, AnimalArmorItem, ArmorItem, ArmorStandItem, ArrowItem, AxeItem, BannerItem, BannerPatternItem, BedItem, BlockItem, BoatItem, BoneMealItem, BookItem, BottleItem, BowItem, BrushItem, BucketItem, BundleItem, ChorusFruitItem, CompassItem, ComplexItem, CrossbowItem, CustomArmorModelTest.EndermanArmorItem, CustomArmorModelTest.TintedArmorItem, CustomElytraTest.CustomElytra, CustomFluidContainerTest.CustomFluidContainer, CustomItemDisplayContextTest.ItemHangerItem, CustomShieldTest.CustomShieldItem, CustomTooltipTest.CustomItemWithTooltip, DebugStickItem, DeferredSpawnEggItem, DiggerItem, DiscFragmentItem, DoubleHighBlockItem, DyeItem, EggItem, ElytraItem, EmptyMapItem, EnchantedBookItem, EndCrystalItem, EnderEyeItem, EnderpearlItem, ExperienceBottleItem, FireChargeItem, FireworkRocketItem, FireworkStarItem, FishingRodItem, FlintAndSteelItem, FoodOnAStickItem, GameMasterBlockItem, GlowInkSacItem, HangingEntityItem, HangingSignItem, HoeItem, HoneyBottleItem, HoneycombItem, InkSacItem, InstrumentItem, Item, ItemFrameItem, ItemNameBlockItem, ItemUseAnimationTest.ThingItem, KnowledgeBookItem, LeadItem, LingeringPotionItem, MaceItem, MapItem, MayFlyAttributeTest.InvertedTelescope, MilkBucketItem, MinecartItem, MobBucketItem, NameTagItem, OminousBottleItem, PickaxeItem, PlaceOnWaterBlockItem, PlayerHeadItem, PotionItem, ProjectileWeaponItem, SaddleItem, ScaffoldingBlockItem, ShearsItem, ShieldItem, ShovelItem, SignItem, SmithingTemplateItem, SnowballItem, SolidBucketItem, SpawnEggItem, SpectralArrowItem, SplashPotionItem, SpyglassItem, StandingAndWallBlockItem, StopUsingItemTest.InvertedTelescope, SuspiciousStewItem, SwordItem, ThrowablePotionItem, TieredItem, TippedArrowItem, TridentItem, WindChargeItem, WritableBookItem, WrittenBookItem
public interface IItemExtension

  • Method Details

    • self

      private Item self()

    • getDefaultAttributeModifiers

      default ItemAttributeModifiers getDefaultAttributeModifiers(ItemStack stack)
      ItemStack sensitive version of getDefaultAttributeModifiers. Used when a stack has no DataComponents.ATTRIBUTE_MODIFIERS component.

    • onDroppedByPlayer

      default boolean onDroppedByPlayer(ItemStack item, Player player)
      Called when a player drops the item into the world, returning false from this will prevent the item from being removed from the players inventory and spawning in the world
      Parameters:
      item - The item stack, before the item is removed.
      player - The player that dropped the item

    • getHighlightTip

      default Component getHighlightTip(ItemStack item, Component displayName)
      Allow the item one last chance to modify its name used for the tool highlight useful for adding something extra that can't be removed by a user in the displayed name, such as a mode of operation.
      Parameters:
      item - the ItemStack for the item.
      displayName - the name that will be displayed unless it is changed in this method.

    • onItemUseFirst

      default InteractionResult onItemUseFirst(ItemStack stack, UseOnContext context)
      This is called when the item is used, before the block is activated.
      Returns:
      Return PASS to allow vanilla handling, any other to skip normal code.

    • isPiglinCurrency

      default boolean isPiglinCurrency(ItemStack stack)
      Called by Piglins when checking to see if they will give an item or something in exchange for this item.
      Returns:
      True if this item can be used as "currency" by piglins

    • makesPiglinsNeutral

      default boolean makesPiglinsNeutral(ItemStack stack, LivingEntity wearer)
      Called by Piglins to check if a given item prevents hostility on sight. If this is true the Piglins will be neutral to the entity wearing this item, and will not attack on sight. Note: This does not prevent Piglins from becoming hostile due to other actions, nor does it make Piglins that are already hostile stop being so.
      Parameters:
      wearer - The entity wearing this ItemStack
      Returns:
      True if piglins are neutral to players wearing this item in an armor slot

    • isRepairable

      boolean isRepairable(ItemStack stack)
      Called by CraftingManager to determine if an item is reparable.
      Returns:
      True if reparable

    • getXpRepairRatio

      default float getXpRepairRatio(ItemStack stack)
      Determines the amount of durability the mending enchantment will repair, on average, per 0.5 points of experience.

    • onStopUsing

      default void onStopUsing(ItemStack stack, LivingEntity entity, int count)
      Called when an entity stops using an item for any reason, notably when selecting another item without releasing or finishing. This method is called in addition to any other hooks called when an item is finished using; when another hook is also called it will be called before this method. Note that if you break an item while using it (that is, it becomes empty without swapping the stack instance), this hook may not be called on the serverside as you are technically still using the empty item (thus this hook is called on air instead). It is necessary to call LivingEntity.stopUsingItem() as part of your
      invalid reference 
      ItemStack#hurtAndBreak(int, LivingEntity, Consumer)
      callback to prevent this issue. For most uses, you likely want one of the following:
      Parameters:
      stack - The Item being used
      entity - The entity using the item, typically a player
      count - The amount of time in tick the item has been used for continuously

    • onLeftClickEntity

      default boolean onLeftClickEntity(ItemStack stack, Player player, Entity entity)
      Called when the player Left Clicks (attacks) an entity. Processed before damage is done, if return value is true further processing is canceled and the entity is not attacked.
      Parameters:
      stack - The Item being used
      player - The player that is attacking
      entity - The entity being attacked
      Returns:
      True to cancel the rest of the interaction.

    • getCraftingRemainingItem

      default ItemStack getCraftingRemainingItem(ItemStack itemStack)
      ItemStack sensitive version of Item.getCraftingRemainingItem(). Returns a full ItemStack instance of the result.
      Parameters:
      itemStack - The current ItemStack
      Returns:
      The resulting ItemStack

    • hasCraftingRemainingItem

      default boolean hasCraftingRemainingItem(ItemStack stack)
      ItemStack sensitive version of Item.hasCraftingRemainingItem().
      Parameters:
      stack - The current item stack
      Returns:
      True if this item has a crafting remaining item

    • getEntityLifespan

      default int getEntityLifespan(ItemStack itemStack, Level level)
      Retrieves the normal 'lifespan' of this item when it is dropped on the ground as a EntityItem. This is in ticks, standard result is 6000, or 5 mins.
      Parameters:
      itemStack - The current ItemStack
      level - The level the entity is in
      Returns:
      The normal lifespan in ticks.

    • hasCustomEntity

      default boolean hasCustomEntity(ItemStack stack)
      Determines if this Item has a special entity for when they are in the world. Is called when a EntityItem is spawned in the world, if true and Item#createCustomEntity returns non null, the EntityItem will be destroyed and the new Entity will be added to the world.
      Parameters:
      stack - The current item stack
      Returns:
      True of the item has a custom entity, If true, Item#createCustomEntity will be called

    • createEntity

      @Nullable default @Nullable Entity createEntity(Level level, Entity location, ItemStack stack)
      This function should return a new entity to replace the dropped item. Returning null here will not kill the EntityItem and will leave it to function normally. Called when the item it placed in a level.
      Parameters:
      level - The level object
      location - The EntityItem object, useful for getting the position of the entity
      stack - The current item stack
      Returns:
      A new Entity object to spawn or null

    • onEntityItemUpdate

      default boolean onEntityItemUpdate(ItemStack stack, ItemEntity entity)
      Called by the default implemetation of EntityItem's onUpdate method, allowing for cleaner control over the update of the item without having to write a subclass.
      Parameters:
      entity - The entity Item
      Returns:
      Return true to skip any further update code.

    • doesSneakBypassUse

      default boolean doesSneakBypassUse(ItemStack stack, LevelReader level, BlockPos pos, Player player)
      Should this item, when held, allow sneak-clicks to pass through to the underlying block?
      Parameters:
      level - The level
      pos - Block position in level
      player - The Player that is wielding the item

    • canEquip

      default boolean canEquip(ItemStack stack, EquipmentSlot armorType, LivingEntity entity)
      Determines if the specific ItemStack can be placed in the specified armor slot, for the entity.
      Parameters:
      stack - The ItemStack
      armorType - Armor slot to be verified.
      entity - The entity trying to equip the armor
      Returns:
      True if the given ItemStack can be inserted in the slot

    • getEquipmentSlot

      @Nullable default @Nullable EquipmentSlot getEquipmentSlot(ItemStack stack)
      Override this to set a non-default armor slot for an ItemStack, but do not use this to get the armor slot of said stack; for that, use LivingEntity.getEquipmentSlotForItem(ItemStack)..
      Parameters:
      stack - the ItemStack
      Returns:
      the armor slot of the ItemStack, or null to let the default vanilla logic as per LivingEntity.getSlotForItemStack(stack) decide

    • isBookEnchantable

      default boolean isBookEnchantable(ItemStack stack, ItemStack book)
      Allow or forbid the specific book/item combination as an anvil enchant
      Parameters:
      stack - The item
      book - The book
      Returns:
      if the enchantment is allowed

    • getArmorTexture

      @Nullable default @Nullable ResourceLocation getArmorTexture(ItemStack stack, Entity entity, EquipmentSlot slot, ArmorMaterial.Layer layer, boolean innerModel)
      Called by RenderBiped and RenderPlayer to determine the armor texture that should be use for the currently equipped item. This will only be called on instances of ItemArmor. Returning null from this function will use the default value.
      Parameters:
      stack - ItemStack for the equipped armor
      entity - The entity wearing the armor
      slot - The slot the armor is in
      layer - The armor layer
      innerModel - Whether the inner model is used
      Returns:
      Path of texture to bind, or null to use default

    • onEntitySwing

      default boolean onEntitySwing(ItemStack stack, LivingEntity entity)
      Called when a entity tries to play the 'swing' animation.
      Parameters:
      entity - The entity swinging the item.
      Returns:
      True to cancel any further processing by EntityLiving

    • getDamage

      default int getDamage(ItemStack stack)
      Return the itemDamage represented by this ItemStack. Defaults to the Damage entry in the stack NBT, but can be overridden here for other sources.
      Parameters:
      stack - The itemstack that is damaged
      Returns:
      the damage value

    • getMaxDamage

      default int getMaxDamage(ItemStack stack)
      Return the maxDamage for this ItemStack. Defaults to the maxDamage field in this item, but can be overridden here for other sources such as NBT.
      Parameters:
      stack - The itemstack that is damaged
      Returns:
      the damage value

    • isDamaged

      default boolean isDamaged(ItemStack stack)
      Return if this itemstack is damaged. Note only called if ItemStack.isDamageableItem() is true.
      Parameters:
      stack - the stack
      Returns:
      if the stack is damaged

    • setDamage

      default void setDamage(ItemStack stack, int damage)
      Set the damage for this itemstack. Note, this method is responsible for zero checking.
      Parameters:
      stack - the stack
      damage - the new damage value

    • canPerformAction

      default boolean canPerformAction(ItemStack stack, ToolAction toolAction)
      Queries if an item can perform the given action. See ToolActions for a description of each stock action
      Parameters:
      stack - The stack being used
      toolAction - The action being queried
      Returns:
      True if the stack can perform the action

    • getMaxStackSize

      default int getMaxStackSize(ItemStack stack)
      Gets the maximum number of items that this stack should be able to hold.
      Parameters:
      stack - The ItemStack
      Returns:
      The maximum size this item can be stacked to

    • getEnchantmentValue

      default int getEnchantmentValue(ItemStack stack)
      ItemStack sensitive version of Item.getEnchantmentValue().
      Parameters:
      stack - The ItemStack
      Returns:
      the enchantment value

    • isPrimaryItemFor

      @OverrideOnly default boolean isPrimaryItemFor(ItemStack stack, Holder<Enchantment> enchantment)
      Checks if an item should be treated as a primary item for a given enchantment.

      Primary items are those that are able to receive the enchantment during enchanting, either from the enchantment table or other random enchantment mechanisms. As a special case, books are primary items for every enchantment.

      Other application mechanisms, such as the anvil, check Enchantment.isSupportedItem(ItemStack) instead. If you want those mechanisms to be able to apply an enchantment, you will need to add your item to the relevant tag.

      Parameters:
      stack - the item stack to be enchanted
      enchantment - the enchantment to be applied
      Returns:
      true if this item should be treated as a primary item for the enchantment

    • getEnchantmentLevel

      @OverrideOnly default int getEnchantmentLevel(ItemStack stack, Holder<Enchantment> enchantment)
      Gets the level of the enchantment currently present on the stack. By default, returns the enchantment level present in NBT. Most enchantment implementations rely upon this method. The returned value must be the same as getting the enchantment from getAllEnchantments(net.minecraft.world.item.ItemStack, net.minecraft.core.HolderLookup.RegistryLookup<net.minecraft.world.item.enchantment.Enchantment>)
      Parameters:
      stack - The item stack being checked
      enchantment - The enchantment being checked for
      Returns:
      Level of the enchantment, or 0 if not present
      See Also:

    • getAllEnchantments

      @OverrideOnly default ItemEnchantments getAllEnchantments(ItemStack stack, HolderLookup.RegistryLookup<Enchantment> lookup)
      Gets a map of all enchantments present on the stack. By default, returns the enchantments present in NBT. Used in several places in code including armor enchantment hooks. The returned value(s) must have the same level as getEnchantmentLevel(net.minecraft.world.item.ItemStack, net.minecraft.core.Holder<net.minecraft.world.item.enchantment.Enchantment>).
      Parameters:
      stack - The item stack being checked
      lookup - A registry lookup, used to resolve enchantment Holders.
      Returns:
      Map of all enchantments on the stack, empty if no enchantments are present
      See Also:

    • shouldCauseReequipAnimation

      default boolean shouldCauseReequipAnimation(ItemStack oldStack, ItemStack newStack, boolean slotChanged)
      Determine if the player switching between these two item stacks
      Parameters:
      oldStack - The old stack that was equipped
      newStack - The new stack
      slotChanged - If the current equipped slot was changed, Vanilla does not play the animation if you switch between two slots that hold the exact same item.
      Returns:
      True to play the item change animation

    • shouldCauseBlockBreakReset

      default boolean shouldCauseBlockBreakReset(ItemStack oldStack, ItemStack newStack)
      Called when the player is mining a block and the item in his hand changes. Allows to not reset blockbreaking if only NBT or similar changes.
      Parameters:
      oldStack - The old stack that was used for mining. Item in players main hand
      newStack - The new stack
      Returns:
      True to reset block break progress

    • canContinueUsing

      default boolean canContinueUsing(ItemStack oldStack, ItemStack newStack)
      Called while an item is in 'active' use to determine if usage should continue. Allows items to continue being used while sustaining damage, for example.
      Parameters:
      oldStack - the previous 'active' stack
      newStack - the stack currently in the active hand
      Returns:
      true to set the new stack to active and continue using it

    • getCreatorModId

      @Nullable default @Nullable String getCreatorModId(ItemStack itemStack)
      Called to get the Mod ID of the mod that *created* the ItemStack, instead of the real Mod ID that *registered* it. For example the Forge Universal Bucket creates a subitem for each modded fluid, and it returns the modded fluid's Mod ID here. Mods that register subitems for other mods can override this. Informational mods can call it to show the mod that created the item.
      Parameters:
      itemStack - the ItemStack to check
      Returns:
      the Mod ID for the ItemStack, or null when there is no specially associated mod and Registry.getKey(Object) would return null.

    • canDisableShield

      default boolean canDisableShield(ItemStack stack, ItemStack shield, LivingEntity entity, LivingEntity attacker)
      Can this Item disable a shield
      Parameters:
      stack - The ItemStack
      shield - The shield in question
      entity - The LivingEntity holding the shield
      attacker - The LivingEntity holding the ItemStack
      Returns:
      True if this ItemStack can disable the shield in question.

    • getBurnTime

      @OverrideOnly default int getBurnTime(ItemStack itemStack, @Nullable @Nullable RecipeType<?> recipeType)
      Returns:
      the fuel burn time for this item stack in a furnace. Return 0 to make it not act as a fuel. Return -1 to let the default vanilla logic decide.

    • onAnimalArmorTick

      @OverrideOnly default void onAnimalArmorTick(ItemStack stack, Level level, Mob horse)
      Called every tick when this item is equipped as an armor item by a horse
      invalid reference 
      that can wear armor
      .

      In vanilla, only horses and wolves can wear armor, and they can only equip items that extend AnimalArmorItem.

      Parameters:
      stack - The armor stack
      level - The level the horse is in
      horse - The horse wearing this item

    • damageItem

      default <T extends LivingEntity> int damageItem(ItemStack stack, int amount, @Nullable T entity, Consumer<Item> onBroken)
      Reduce the durability of this item by the amount given. This can be used to e.g. consume power from NBT before durability.
      Parameters:
      stack - The itemstack to damage
      amount - The amount to damage
      entity - The entity damaging the item
      onBroken - The on-broken callback from vanilla
      Returns:
      The amount of damage to pass to the vanilla logic

    • onDestroyed

      default void onDestroyed(ItemEntity itemEntity, DamageSource damageSource)
      Called when an item entity for this stack is destroyed. Note: The ItemStack can be retrieved from the item entity.
      Parameters:
      itemEntity - The item entity that was destroyed.
      damageSource - Damage source that caused the item entity to "die".

    • isEnderMask

      default boolean isEnderMask(ItemStack stack, Player player, EnderMan endermanEntity)
      Whether this Item can be used to hide player head for enderman.
      Parameters:
      stack - the ItemStack
      player - The player watching the enderman
      endermanEntity - The enderman that the player look
      Returns:
      true if this Item can be used to hide player head for enderman

    • canElytraFly

      default boolean canElytraFly(ItemStack stack, LivingEntity entity)
      Used to determine if the player can use Elytra flight. This is called Client and Server side.
      Parameters:
      stack - The ItemStack in the Chest slot of the entity.
      entity - The entity trying to fly.
      Returns:
      True if the entity can use Elytra flight.

    • elytraFlightTick

      default boolean elytraFlightTick(ItemStack stack, LivingEntity entity, int flightTicks)
      Used to determine if the player can continue Elytra flight, this is called each tick, and can be used to apply ItemStack damage, consume Energy, or what have you. For example the Vanilla implementation of this, applies damage to the ItemStack every 20 ticks.
      Parameters:
      stack - ItemStack in the Chest slot of the entity.
      entity - The entity currently in Elytra flight.
      flightTicks - The number of ticks the entity has been Elytra flying for.
      Returns:
      True if the entity should continue Elytra flight or False to stop.

    • canWalkOnPowderedSnow

      default boolean canWalkOnPowderedSnow(ItemStack stack, LivingEntity wearer)
      Called by the powdered snow block to check if a living entity wearing this can walk on the snow, granting the same behavior as leather boots. Only affects items worn in the boots slot.
      Parameters:
      stack - Stack instance
      wearer - The entity wearing this ItemStack
      Returns:
      True if the entity can walk on powdered snow

    • isDamageable

      default boolean isDamageable(ItemStack stack)
      Used to test if this item can be damaged, but with the ItemStack in question. Please note that in some cases no ItemStack is available, so the stack-less method will be used.
      Parameters:
      stack - ItemStack in the Chest slot of the entity.

    • getSweepHitBox

      default AABB getSweepHitBox(ItemStack stack, Player player, Entity target)
      Get a bounding box (AABB) of a sweep attack.
      Parameters:
      stack - the stack held by the player.
      player - the performing the attack the attack.
      target - the entity targeted by the attack.
      Returns:
      the bounding box.

    • getFoodProperties

      @Nullable default @Nullable FoodProperties getFoodProperties(ItemStack stack, @Nullable @Nullable LivingEntity entity)
      Get the food properties for this item. Use this instead of the
      invalid reference 
      Item#getFoodProperties()
      method, for ItemStack sensitivity. The @Nullable annotation was only added, due to the default method, also being @Nullable. Use this with a grain of salt, as if you return null here and true at
      invalid reference 
      Item#isEdible()
      , NPEs will occur!
      Parameters:
      stack - The ItemStack the entity wants to eat.
      entity - The entity which wants to eat the food. Be aware that this can be null!
      Returns:
      The current FoodProperties for the item.

    • isNotReplaceableByPickAction

      default boolean isNotReplaceableByPickAction(ItemStack stack, Player player, int inventorySlot)
      Whether the given ItemStack should be excluded (if possible) when selecting the target hotbar slot of a "pick" action. By default, this returns true for enchanted stacks.
      Parameters:
      player - the player performing the picking
      inventorySlot - the inventory slot of the item being up for replacement
      Returns:
      true to leave this stack in the hotbar if possible
      See Also:

    • canGrindstoneRepair

      default boolean canGrindstoneRepair(ItemStack stack)
      Returns true if the given ItemStack can be put into a grindstone to be repaired and/or stripped of its enchantments.
      Returns:
      true if the given ItemStack can be put into a grindstone to be repaired and/or stripped of its enchantments