FIX: Ensure callback delegates are created for ActionMaps added after an asset has already assigned to PlayerInput component (case ISXB-711)

Assets/Tests/InputSystem/Plugins/PlayerInputTests.cs

@@ -2405,6 +2405,39 @@ public void PlayerInput_CanDisableAfterAssigningAction_WithControlSchemesAndInte
         player.SetActive(false); // Should cause full rebinding and not assert
     }
 
+    [Test]
+    [Category("PlayerInput")]
+    public void PlayerInput_DelegatesAreUpdate_WhenActionMapAddedAfterAssignment()
+    {
+        var gamepad = InputSystem.AddDevice<Gamepad>();
+
+        var go = new GameObject();
+        var listener = go.AddComponent<MessageListener>();
+        var playerInput = go.AddComponent<PlayerInput>();
+        playerInput.defaultActionMap = "Other";
+        var actionAsset = InputActionAsset.FromJson(kActions);
+        playerInput.actions = actionAsset;
+
+        // Disable the asset while adding another action map to it as none
+        // of the actions in the asset can be enabled during modification
+        //
+        actionAsset.Disable();
+        var keyboard = InputSystem.AddDevice<Keyboard>();
+        var newActionMap = actionAsset.AddActionMap("NewMap");
+        var newAction = newActionMap.AddAction("NewAction");
+        newAction.AddBinding("<Keyboard>/k", groups: "Keyboard");
+        actionAsset.AddControlScheme("Keyboard").WithRequiredDevice<Keyboard>();
+        actionAsset.Enable();
+
+        playerInput.currentActionMap = newActionMap;
+        playerInput.ActivateInput();
+        listener.messages.Clear();
+
+        Press(keyboard.kKey);
+
+        Assert.That(listener.messages, Has.Exactly(1).With.Property("name").EqualTo("OnNewAction"));
+    }
+
     private struct Message : IEquatable<Message>
     {
         public string name { get; set; }
@@ -2477,6 +2510,11 @@ public void OnOtherAction(InputValue value)
             messages?.Add(new Message { name = "OnOtherAction", value = value.Get<float>() });
         }
 
+        public void OnNewAction(InputValue value)
+        {
+            messages?.Add(new Message { name = "OnNewAction", value = value.Get<float>() });
+        }
+
         // ReSharper disable once UnusedMember.Local
         public void OnActionWithSpaces(InputValue value)
         {

Packages/com.unity.inputsystem/CHANGELOG.md

@@ -32,6 +32,7 @@ however, it has to be formatted properly to pass verification tests.
 - Fixed an issue in `Samples/Visualizers/GamepadVisualizer.unity` sample where the visualization wouldn't handle device disconnects or current device changes properly (ISXB-1243).
 - Fixed an issue when displaying Serialized InputAction's Processor properties inside the Inspector window. [ISXB-1269](https://issuetracker.unity3d.com/product/unity/issues/guid/ISXB-1269)
 - Fixed an issue with default device selection when adding new Control Scheme.
+- Fixed an issue where action map delegates were not updated when the asset already assigned to the PlayerInput component were changed [ISXB-711](https://issuetracker.unity3d.com/product/unity/issues/guid/ISXB-711).
 
 ### Changed
 - Added back the InputManager to InputSystem project-wide asset migration code with performance improvement (ISX-2086).

Packages/com.unity.inputsystem/InputSystem/Plugins/PlayerInput/PlayerInput.cs

@@ -950,6 +950,8 @@ public TDevice GetDevice<TDevice>()
         /// </example>
         public void ActivateInput()
         {
+            UpdateDelegates();
+
             m_InputActive = true;
 
             // If we have no current action map but there's a default
@@ -960,6 +962,31 @@ public void ActivateInput()
                 m_CurrentActionMap?.Enable();
         }
 
+        // Users can add and remove actions maps *after* assigning an InputActionAsset to the PlayerInput component.
+        // This ensures "actionTriggered" delegates are assigned for new maps (case isxb-711)
+        //
+        private int m_AllMapsHashCode = 0;
+        private void UpdateDelegates()
+        {
+            if (m_Actions == null)
+            {
+                m_AllMapsHashCode = 0;
+                return;
+            }
+
+            int allMapsHashCode = 0;
+            foreach (var actionMap in m_Actions.actionMaps)
+            {
+                allMapsHashCode ^= actionMap.GetHashCode();
+            }
+            if (m_AllMapsHashCode != allMapsHashCode)
+            {
+                InstallOnActionTriggeredHook();
+                CacheMessageNames();
+                m_AllMapsHashCode = allMapsHashCode;
+            }
+        }
+
         /// <summary>
         /// Disable input on the player, by disabling the current action map
         /// </summary>
@@ -1515,6 +1542,8 @@ private void CacheMessageNames()
 
         private void ClearCaches()
         {
+            if (m_ActionMessageNames != null)
+                m_ActionMessageNames.Clear();
         }
 
         /// <summary>