Created InventoryItemEditor/boilerplate

RPG Project/Assets/Scripts/Inventories/Editor/InventoryItemEditor.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEditor;
+using UnityEditor.Callbacks;
+using UnityEngine;
+
+namespace GameDevTV.Inventories.Editor
+{
+    public class InventoryItemEditor : EditorWindow
+    {
+        [NonSerialized] InventoryItem selected = null;
+
+
+
+        /// <summary>
+        /// This is the boilerplate code that all EditorWindows need to have in order to function.
+        /// The MenuItem directive adds an item to the Editor Menu system.
+        /// </summary>
+        [MenuItem("Window/InventoryItem Editor")]
+        public static void ShowEditorWindow()
+        {
+            GetWindow(typeof(InventoryItemEditor), false, "InventoryItem");
+        }
+
+        /// <summary>
+        /// This is a special version of ShowEditorWindow that takes a parameter InventoryItem candidate.
+        /// This makes it so that when you double click on an InventoryItem to "open" it, the window will automatically
+        /// have the correct file selected.
+        /// </summary>
+        /// <param name="candidate"></param>
+        public static void ShowEditorWindow(InventoryItem candidate) { 
+            InventoryItemEditor window = GetWindow(typeof(InventoryItemEditor), false, "Dialogue Editor") as InventoryItemEditor;
+            if (candidate)
+            {
+                window.OnSelectionChange();
+            }
+        }
+
+        /// <summary>
+        /// The tag [OnOpenAsset(1)] hooks the OnOpenAsset method into the list of methods to check if
+        /// an asset is the type of asset we should open.  Since we want to open any child of InventoryItem
+        /// we're checking to see if the asset can be cast as an InventoryItem.
+        /// </summary>
+        /// <param name="instanceID"></param>
+        /// <param name="line"></param>
+        /// <returns></returns>
+        [OnOpenAsset(1)]
+        public static bool OnOpenAsset(int instanceID, int line)
+        {
+            InventoryItem candidate = EditorUtility.InstanceIDToObject(instanceID) as InventoryItem;
+            if (candidate != null)
+            {
+                ShowEditorWindow(candidate); //pass 
+
+                return true;
+            }
+            return false;
+        }
+
+        void OnSelectionChange()
+        {
+            var candidate = EditorUtility.InstanceIDToObject(Selection.activeInstanceID) as InventoryItem;
+            if (candidate == null) return;
+            selected = candidate;
+            Repaint();
+        }
+
+        void OnGUI()
+        {
+            if (!selected)
+            {
+                EditorGUILayout.HelpBox("No Dialogue Selected", MessageType.Error);
+                return;
+            }
+            EditorGUILayout.HelpBox($"{selected.name}/{selected.GetDisplayName()}", MessageType.Info);
+        }
+    }
+}