Editor

Custom Unity Editor tooling for the InputSystem. Provides property drawers for binding configuration and a custom inspector for InputActionScheme assets, enabling visual binding assignment, callback validation, and action map management from the Inspector.

Architecture

Editor Components

Component	Type	Draws / Inspects	Purpose
InputActionSchemeEditor	Custom Editor	InputActionScheme	Custom inspector showing the asset field and bindings (conditionally)
InputActionSchemeBindingsDrawer	Property Drawer	InputActionSchemeBindings	Foldable box rendering the binding dictionary as labeled entries
InputActionMapBindingDrawer	Property Drawer	InputActionMapBinding	Polymorphic binding selector with callback validation display

Visual Structure

The editor tooling composes into a nested display:

InputActionSchemeEditor
├── [Asset] InputActionAsset field
└── [Bindings] InputActionSchemeBindingsDrawer (foldable box)
    ├── "Movement" → InputActionMapBindingDrawer
    │   ├── [Header] Foldout + PolymorphicObjectField (select binding type)
    │   └── [Body] Callback validation list
    │       ├── ✅ Move → OnMove(Vector2)
    │       ├── ✅ Jump → OnJump()
    │       └── ❌ Sprint (no callback method found)
    ├── "Camera" → InputActionMapBindingDrawer
    │   └── ...
    └── "UI" → null (no binding assigned)

Key Patterns

Callback Validation

InputActionMapBindingDrawer uses reflection to discover methods marked with [InputActionCallback] on the binding class. It renders each action from the action map with a green check (✅) or red X (❌) indicating whether a matching callback method exists. This provides immediate feedback about missing or misconfigured callbacks.

Conditional Rendering

InputActionSchemeEditor only shows the bindings property when scheme.HasAsset is true. This prevents displaying an empty binding list when no InputActionAsset has been assigned.

Dependencies

Dependency	Usage
Odin Inspector	OdinValueDrawer<T>, OdinEditor, SirenixEditorGUI, SirenixEditorFields
Paragon.Editor	DrawGUI utility, ParagonDrawer<T> base class
UnityEditor	CustomEditor, ObjectNames, EditorGUI
Unity Input System	InputActionMap, InputAction

See Also

• InputSystem Overview — runtime system overview

• InputActionScheme — the scheme MonoBehaviour

• InputActionSchemeBindings — the bindings collection

• InputActionMapBinding — abstract binding base class