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Assets/AmplifyShaderEditor/Plugins/Editor/Menu/DragAndDropTool.cs

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+// Amplify Shader Editor - Visual Shader Editing Tool
+// Copyright (c) Amplify Creations, Lda <info@amplify.pt>
+
+using UnityEditor;
+using UnityEngine;
+
+namespace AmplifyShaderEditor
+{
+    public class DragAndDropTool
+    {
+        public delegate void OnValidDropObject(params UnityEngine.Object[] draggedObjs );
+        public event OnValidDropObject OnValidDropObjectEvt;
+
+        public void Destroy()
+        {
+            OnValidDropObjectEvt = null;
+        }
+
+        public void TestDragAndDrop( Rect dropArea )
+        {
+            Event currentEvent = Event.current;
+            EventType currentEventType = currentEvent.type;
+            
+            switch (currentEventType)
+            {
+                case EventType.DragUpdated:
+                case EventType.DragPerform:
+                {
+                    
+                    if (!dropArea.Contains(currentEvent.mousePosition))
+                        return;
+
+                    DragAndDrop.visualMode = DragAndDropVisualMode.Copy;
+                    if (currentEvent.type == EventType.DragPerform)
+                    {
+                        DragAndDrop.AcceptDrag();
+                        if (OnValidDropObjectEvt != null)
+                        {
+                            OnValidDropObjectEvt(DragAndDrop.objectReferences);
+                        }
+                    }
+                }break;
+                //case EventType.DragExited:DragAndDrop.PrepareStartDrag();break;
+            }
+        }
+    }
+}