Added a callback when the graph asset is deleted on disk

Author: alelievr

Assets/com.alelievr.NodeGraphProcessor/Editor/Callbacks/OnBaseGraphDeleted.cs

@@ -1,8 +1,5 @@
-using System.Collections;
-using System.Collections.Generic;
-using UnityEngine;
+using UnityEngine;
 using UnityEditor;
-using UnityEditor.Callbacks;
 
 namespace GraphProcessor
 {
@@ -11,16 +8,20 @@ public class DeleteCallback : UnityEditor.AssetModificationProcessor
 	{
 		static AssetDeleteResult OnWillDeleteAsset(string path, RemoveAssetOptions options)
 		{
-			var graph = AssetDatabase.LoadAssetAtPath(path, typeof(BaseGraph));
+			var objects = AssetDatabase.LoadAllAssetsAtPath(path);
 
-			if (graph != null)
+			foreach (var obj in objects)
 			{
-				foreach (var graphWindow in Resources.FindObjectsOfTypeAll< BaseGraphWindow >())
-					graphWindow.OnGraphDeleted();
+				if (obj is BaseGraph b)
+				{
+					foreach (var graphWindow in Resources.FindObjectsOfTypeAll< BaseGraphWindow >())
+						graphWindow.OnGraphDeleted();
+					
+					b.OnAssetDeleted();
+				}
 			}
 
 			return AssetDeleteResult.DidNotDelete;
 		}
 	}
-
 }

Assets/com.alelievr.NodeGraphProcessor/Runtime/Graph/BaseGraph.cs

@@ -214,6 +214,8 @@ protected virtual void OnDisable()
 				node.DisableInternal();
 		}
 
+		public virtual void OnAssetDeleted() {}
+
 		/// <summary>
 		/// Adds a node to the graph
 		/// </summary>