[Material graph] Tidy up asset handling (generic graph drawer that can be used by all graphs)

MaterialGraphProject/Assets/GraphFramework/SerializableGraph/Editor/Drawing/GraphDataSource.cs

                 }
                 return s_DrawerUI;
             }
-        } 
+        }
 
         public CanvasElement[] FetchElements()
         {

MaterialGraphProject/Assets/GraphFramework/SerializableGraph/Editor/Drawing/GraphEditWindow.cs

 
 namespace UnityEditor.Graphing.Drawing
 {
-    class GraphEditWindow : EditorWindow
+    public class GraphEditWindow : AbstractGraphEditWindow<SerializableGraphAsset>
     {
         [MenuItem("Window/Graph Editor")]
         public static void OpenMenu()
+    }
+    public abstract class AbstractGraphEditWindow<T> : EditorWindow where T : ScriptableObject, IGraphAsset
+    {
-        private SerializableGraphAsset m_LastSelection;
+        private T m_LastSelection;
         
         [NonSerialized]
         private Canvas2D m_Canvas;
         {
             get
             {
-                return m_LastSelection != null && m_LastSelection.graph != null;
+                return m_LastSelection != null && m_LastSelection.shouldRepaint;
             }
         }
 
             if (Selection.activeObject == null || !EditorUtility.IsPersistent(Selection.activeObject))
                 return;
             
-            if (Selection.activeObject is SerializableGraphAsset)
+            if (Selection.activeObject is T)
-                var selection = (SerializableGraphAsset) Selection.activeObject;
+                var selection = (T) Selection.activeObject;
                 if (selection != m_LastSelection)
                 {
                     m_LastSelection = selection;
             EditorGUILayout.EndHorizontal();
         }*/
     }
+
 }

MaterialGraphProject/Assets/GraphFramework/SerializableGraph/Runtime/Assets/SerializableGraphAsset.cs

 namespace UnityEngine.Graphing
 {
-    public class SerializableGraphAsset : ScriptableObject
+    public interface IGraphAsset
+    {
+        IGraph graph { get; }
+        bool shouldRepaint { get; }
+    }
+
+    public class SerializableGraphAsset : ScriptableObject, IGraphAsset
-        private SerializableGraph m_Graph = new SerializableGraph();
+        protected SerializableGraph m_Graph = new SerializableGraph();
-        public SerializableGraph graph
+        public IGraph graph
+        }
+
+        public bool shouldRepaint
+        {
+            get { return false; }
         }
     }
 }

MaterialGraphProject/Assets/GraphFramework/SerializableGraph/Runtime/Implementation/SerializableGraph.cs

             foreach (var node in nodes)
                 node.ValidateNode();
         }
+
+        public virtual bool RequiresConstantRepaint()
+        {
+            return false;
+        }
     }
 }

MaterialGraphProject/Assets/UnityShaderEditor/Runtime/AbstractMaterialGraph.cs

             }
         }
 
+        public override bool RequiresConstantRepaint()
+        {
+            return nodes.OfType<IRequiresTime>().Any();
+        }
+
         /*public PreviewRenderUtility previewUtility
         {
             get

MaterialGraphProject/Assets/UnityShaderEditor/Runtime/MaterialGraphAsset.cs

+using System.Linq;
+using UnityEngine.Graphing;
+
-    public class MaterialGraphAsset : ScriptableObject
+    public class MaterialGraphAsset : ScriptableObject, IGraphAsset
-        public MaterialGraph graph
+        public IGraph graph
-            get { return m_MaterialGraph; }
+            get { return m_MaterialGraph.currentGraph; }
+        }
+
+        public bool shouldRepaint
+        {
+            get { return graph.nodes.OfType<IRequiresTime>().Any(); }
         }
 
         public Material GetMaterial()

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

+using UnityEditor.Graphing.Drawing;
+using UnityEngine.MaterialGraph;
+
+namespace UnityEditor.MaterialGraph
+{
+    public class MaterialGraphEditWindow : AbstractGraphEditWindow<MaterialGraphAsset>
+    {
+        [MenuItem("Window/Material Editor")]
+        public static void OpenMenu()
+        {
+            GetWindow<MaterialGraphEditWindow>();
+        }
+    }
+}

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

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