⚖️ Condition

https://minecraft.wiki/w/Items_model_definition#condition

In this configuration, when you use "minecraft:condition," you need to specify the condition type, which is the "property" mentioned below. "on-false" and "on-true" respectively represent displaying different models under different conditions.

items:
  default:condition_item:
    model:
      type: "minecraft:condition"
      property: "minecraft:using_item"
      on-false:
        type: "minecraft:model"
        path: "minecraft:item/custom/model_false"
      on-true:
        type: "minecraft:model"
        path: "minecraft:item/custom/model_true"

Available Properties

minecraft:broken

Return true if the item is damageable and has only one use remaining before breaking.

minecraft:carried

Return true if item is carried between slots in GUI.

minecraft:damaged

Return true if the item is damageable and has been used at least once.

minecraft:extended_view

Return true if player has requested extended details by holding shift key down. Only works when item is displayed in UI. Note: not a keybind, can't be rebound.

minecraft:fishing_rod/cast

Return true if there is a fishing bobber attached to currently used fishing rod.

minecraft:selected

Return true if item is selected on a hotbar.

minecraft:using_item

Return true if player is currently using this item.

minecraft:view_entity

• When not spectating, return true if context entity is the local player entity, i.e. the one controlled by client.

• When spectating, return true if context entity is the spectated entity.

• If context entity is not present, will return false.

minecraft:bundle/has_selected_item

Return true if bundle is "open", i.e. it has selected item visible in GUI.

minecraft:component (Not Implemented)

Uses component item sub predicates to match item components.

minecraft:has_component

Return true if the given component is present on the item.

type: "minecraft:condition"
property: "minecraft:has_component"
component: minecraft:enchantments
ignore-default: false

minecraft:keybind_down

Return true if keybind is currently active.

type: "minecraft:condition"
property: "minecraft:keybind_down"
keybind: key.left

minecraft:custom_model_data

Return value from flags list in minecraft:custom_model_data component.

type: "minecraft:condition"
property: "minecraft:custom_model_data"
index: 0