Extracted abstract base class from MaterialGraphInspector

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/AbstractMaterialGraphInspector.cs

 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Text;
 using UnityEditor.Graphing.Drawing;
 using UnityEngine;
 using UnityEngine.Graphing;
 {
-    [CustomEditor(typeof(MaterialGraphAsset))]
-    public class MaterialGraphInspector : AbstractGraphInspector
+    public abstract class AbstractMaterialGraphInspector : AbstractGraphInspector
-        private GUIContent m_Title = new GUIContent();
+        protected GUIContent m_Title = new GUIContent();
+        
+        private NodePreviewDrawData m_NodePreviewPresenter;
-        private AbstractMaterialNode previewNode
+        protected AbstractMaterialNode previewNode
         {
             get { return m_PreviewNode; }
             set
             }
         }
 
-        private NodePreviewDrawData m_NodePreviewPresenter;
-
-        private UnityEngine.MaterialGraph.MaterialGraph materialGraph
+        protected override void AddTypeMappings(Action<Type, Type> map)
-            get { return m_GraphAsset.graph as UnityEngine.MaterialGraph.MaterialGraph; }
+            map(typeof(AbstractSurfaceMasterNode), typeof(SurfaceMasterNodeInspector));
         }
 
         private void OnPreviewNodeModified(INode node, ModificationScope scope)
         }
 
-        protected override void AddTypeMappings(Action<Type, Type> map)
-        {
-            map(typeof(AbstractSurfaceMasterNode), typeof(SurfaceMasterNodeInspector));
-        }
-
-            previewNode = materialGraph.masterNode as AbstractMaterialNode;
+            previewNode = null;
         }
 
         public override bool HasPreviewGUI()

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/AbstractMaterialGraphInspector.cs.meta

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MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/GraphInspectors.meta

+fileFormatVersion: 2
+guid: 56bd8d0f45aa3394cb70153872cf053b
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+timeCreated: 1483621325
+licenseType: Pro
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MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/GraphInspectors/MaterialGraphInspector.cs

+using UnityEngine.MaterialGraph;
+
+namespace UnityEditor.MaterialGraph.Drawing
+{
+    [CustomEditor(typeof(MaterialGraphAsset))]
+    public class MaterialGraphInspector : AbstractMaterialGraphInspector
+    {
+        private UnityEngine.MaterialGraph.MaterialGraph materialGraph
+        {
+            get { return m_GraphAsset.graph as UnityEngine.MaterialGraph.MaterialGraph; }
+        }
+
+        public override void OnEnable()
+        {
+            base.OnEnable();
+            previewNode = materialGraph.masterNode as AbstractMaterialNode;
+        }
+    }
+}