Tidied up the Master Preview View

Uni-36221

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/Inspector/MasterPreviewView.cs

 using System;
 using System.Collections;
 using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
 using UnityEngine;
 using UnityEditor.Experimental.UIElements;
 using UnityEngine.Experimental.UIElements;
         ObjectField m_PreviewMeshPicker;
 
         MasterNode m_MasterNode;
+        Mesh m_PreviousMesh;
+
+        List<string> m_DoNotShowPrimitives = new List<string>( new string[] {PrimitiveType.Plane.ToString()});
+
+        static Type s_ContextualMenuManipulator = AppDomain.CurrentDomain.GetAssemblies().SelectMany(x => x.GetTypes()).FirstOrDefault(t => t.FullName == "UnityEngine.Experimental.UIElements.ContextualMenuManipulator");
+        static Type s_ObjectSelector = AppDomain.CurrentDomain.GetAssemblies().SelectMany(x => x.GetTypes()).FirstOrDefault(t => t.FullName == "UnityEditor.ObjectSelector");
+            this.clippingOptions = ClippingOptions.ClipAndCacheContents;
             m_Graph = graph;
 
             AddStyleSheetPath("Styles/MaterialGraph");
 
             var topContainer = new VisualElement() { name = "top" };
             {
-                var title = new Label(assetName + " master node preview") { name = "title" };
+                var title = new Label(assetName.Split('/').Last()) { name = "title" };
                 topContainer.Add(title);
             }
             Add(topContainer);
                 m_PreviewTextureView = new PreviewTextureView { name = "preview", image = Texture2D.blackTexture };
-                m_PreviewTextureView.AddManipulator(new Draggable(OnMouseDragPreviwMesh, true));
+                m_PreviewTextureView.AddManipulator(new Draggable(OnMouseDragPreviewMesh, true));
+                m_PreviewTextureView.AddManipulator((IManipulator)Activator.CreateInstance(s_ContextualMenuManipulator, (Action<ContextualMenuPopulateEvent>)BuildContextualMenu));
+
                 middleContainer.Add(m_PreviewTextureView);
 
                 m_PreviewScrollPosition = new Vector2(0f, 0f);
             Add(middleContainer);
+        }
-            var bottomContainer = new VisualElement() { name = "bottom" };
+        void BuildContextualMenu(ContextualMenuPopulateEvent evt)
+        { 
+            foreach (var primitiveTypeName in Enum.GetNames(typeof(PrimitiveType)))
-                m_PreviewMeshPicker = new ObjectField { name = "picker", objectType = typeof(Mesh) };
-                m_PreviewMeshPicker.OnValueChanged(OnPreviewMeshChanged);
-
-                bottomContainer.Add(m_PreviewMeshPicker);
+                if(m_DoNotShowPrimitives.Contains(primitiveTypeName))
+                    continue;
+                evt.menu.AppendAction(primitiveTypeName, e => ChangePrimitiveMesh( primitiveTypeName ), ContextualMenu.MenuAction.AlwaysEnabled);
-            Add(bottomContainer);
+
+            evt.menu.AppendAction("Custom Mesh", e => ChangeMeshCustom(), ContextualMenu.MenuAction.AlwaysEnabled);
         }
 
         MasterNode masterNode
             m_PreviewTextureView.Dirty(ChangeType.Repaint);
         }
 
-        void OnPreviewMeshChanged(ChangeEvent<Object> changeEvent)
+        void ChangePrimitiveMesh(string primitiveName)
-            Mesh changedMesh = changeEvent.newValue as Mesh;
+            Mesh changedPrimitiveMesh = Resources.GetBuiltinResource(typeof(Mesh), string.Format("{0}.fbx", primitiveName)) as Mesh;
+
+            ChangeMesh(changedPrimitiveMesh);
+        }
+
+        void ChangeMesh(Mesh mesh)
+        {
+            Mesh changedMesh = mesh;
 
             masterNode.Dirty(ModificationScope.Node);
 
             m_Graph.previewData.serializedMesh.mesh = changedMesh;
         }
 
-        void OnMouseDragPreviwMesh(Vector2 deltaMouse)
+        private static EditorWindow Get()
+        {
+            PropertyInfo P = s_ObjectSelector.GetProperty("get", BindingFlags.Public | BindingFlags.Static);
+            return P.GetValue(null,null) as EditorWindow;
+        }
+
+        void OnMeshChanged(Object obj)
+        {
+            var mesh = obj as Mesh;
+            if (mesh == null)
+                mesh = m_PreviousMesh;
+            ChangeMesh(mesh);
+        }
+
+        void ChangeMeshCustom()
+        {
+            MethodInfo ShowMethod = s_ObjectSelector.GetMethod("Show", BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.DeclaredOnly, Type.DefaultBinder, new[] {typeof(Object), typeof(Type), typeof(SerializedProperty), typeof(bool), typeof(List<int>), typeof(Action<Object>), typeof(Action<Object>)}, new ParameterModifier[7]);
+            m_PreviousMesh = m_Graph.previewData.serializedMesh.mesh;
+            ShowMethod.Invoke(Get(), new object[] { null, typeof(Mesh), null, false, null, (Action<Object>)OnMeshChanged, (Action<Object>)OnMeshChanged });
+        }
+
+        void OnMouseDragPreviewMesh(Vector2 deltaMouse)
         {
             Vector2 previewSize = m_PreviewTextureView.contentRect.size;
 

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Resources/Styles/MaterialGraph.uss

     justify-content: flex-start;
     min-width: 200;
     min-height: 200;
+	border-radius: 6;
+	border-top-width: 1;
+    border-bottom-width: 1;
+    border-left-width: 1;
+    border-right-width: 1;
+	border-color: rgb(25,25,25);
+	
-    background-color: rgb(64, 64, 64);
-}
-
-MasterPreviewView > #top > #title {
-    font-style: bold;
-    font-size: 11;
-}
-
-MasterPreviewView > #top {
+	background-color: rgb(64, 64, 64);
+	border-top-left-radius: 6;
+	border-top-right-radius: 6;
+}
+
+MasterPreviewView > #top > #title {
+	font-size: 12;
+    text-color: rgb(180, 180, 180);
+	padding-top: 1;
+    padding-bottom: 2;
+    padding-left: 2;
+    padding-right: 2;
+	border-width: 10;
-    margin-bottom: 40;
+	border-color: rgb(0,10,190);
-}
-
-MasterPreviewView > #bottom {
-    background-color: rgb(79, 79, 79);
-    position-type: absolute;
-    position-bottom: 0;
-    position-left: 0;
-    position-right: 0;
-    padding-left: 10;
-    padding-right: 10;
-    padding-top: 8;
-    padding-bottom: 12;
-}
-
-MasterPreviewView > #bottom > #picker > ObjectFieldDisplay > Label {
-    font-size: 11;
+	border-width: 10;
+	border-color: rgb(200,10,190);
 }
 
 #resizeBorderFrame > .resize {