Property Drawer for InputPlayerAction

Editor/PropertyDrawers/InputAssetActionPropertyDrawer.cs

             EditorGUI.PropertyField(position, asset, new GUIContent("Input Action Asset"));
             EditorGUI.indentLevel++;
             position.y += EditorGUIUtility.singleLineHeight + 2;
-            //EditorGUI.PropertyField(position, path);
+            
-                path.stringValue = paths[selected];
+                if (selected >= 0)
+                    path.stringValue = paths[selected];
+                else
+                    path.stringValue = string.Empty; 
             }
             EditorGUI.indentLevel--;
         }

Runtime/LevelScripting/Events/OnPlayerInputActionEvent.cs

 #if !ENABLE_INPUT_SYSTEM
     [WarnDisabledModule("New Input System")]
 #endif
-    [AddComponentMenu(ComponentMenu.eventsPath + "On Input Asset Action Event (New Input System)")]
+    [AddComponentMenu(ComponentMenu.eventsPath + "On Player Input Action Event (New Input System)")]
     public class OnPlayerInputActionEvent : EventBase
     {
 #if ENABLE_INPUT_SYSTEM

Editor/PropertyDrawers/InputPlayerActionPropertyDrawer.cs

+#if ENABLE_INPUT_SYSTEM
+using UnityEngine;
+using UnityEditor;
+using UnityEngine.InputSystem;
+using System.Linq;
+using System.Collections.Generic;
+using GameplayIngredients.Events;
+
+namespace GameplayIngredients.Editor
+{
+    [CustomPropertyDrawer(typeof(PlayerInputAction))]
+    public class InputPlayerActionPropertyDrawer: PropertyDrawer
+    {
+        public override float GetPropertyHeight(SerializedProperty property, GUIContent label)
+        {
+            return EditorGUIUtility.singleLineHeight * 2 + 8;
+        }
+
+        public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
+        {
+            var asset = property.FindPropertyRelative("playerInput");
+            var path = property.FindPropertyRelative("path");
+
+            position.height = EditorGUIUtility.singleLineHeight;
+            EditorGUI.PropertyField(position, asset, new GUIContent("Player Input"));
+            EditorGUI.indentLevel++;
+            position.y += EditorGUIUtility.singleLineHeight + 2;
+            
+            var paths = GetPaths(asset.objectReferenceValue as InputActionAsset);
+            int selected = paths.IndexOf(path.stringValue);
+            selected = EditorGUI.Popup(position, "Action", selected, paths);
+            if(GUI.changed)
+            {
+                if (selected >= 0)
+                    path.stringValue = paths[selected];
+                else
+                    path.stringValue = string.Empty;
+            }
+            EditorGUI.indentLevel--;
+        }
+
+        string[] GetPaths(InputActionAsset asset)
+        {
+            if (asset == null)
+                return new string[0];
+
+            List<string> paths = new List<string>();
+
+            foreach(var map in asset.actionMaps)
+            {
+                if (map == null) continue;
+                foreach(var action in map.actions)
+                {
+                    if (action == null) continue;
+
+                    paths.Add($"{map.name}{InputAssetAction.pathSeparator}{action.name}");
+                }
+            }
+
+            return paths.ToArray();
+        }
+    }
+}
+#endif

Editor/PropertyDrawers/InputPlayerActionPropertyDrawer.cs.meta

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