Make UIBlock Interface public, as on Android (#1050)

* This will allow gre/react-native-view-shot#45 (and in turn, Galooshi/happo ) to allow us to do screenshot-based tests in the CI

ReactWindows/ReactNative.Net46/ReactPage.cs

@@ -156,7 +156,7 @@ namespace ReactNative
         /// </summary>
         public async Task DisposeAsync()
         {
-            RootView?.RemoveHandler(Keyboard.KeyDownEvent, (KeyEventHandler) OnAcceleratorKeyActivated);
+            RootView?.RemoveHandler(Keyboard.KeyDownEvent, (KeyEventHandler)OnAcceleratorKeyActivated);
 
             if (_reactInstanceManager.IsValueCreated)
             {

ReactWindows/ReactNative.Net46/UIManager/UIManagerModule.cs

@@ -137,7 +137,17 @@ namespace ReactNative.UIManager
             return tag;
         }
 
-#region React Methods
+        /// <summary>
+        /// Schedule a block to be executed on the UI thread. Useful if you need to execute
+        /// view logic after all currently queued view updates have completed.
+        /// </summary>
+        /// <param name="block">The UI block.</param>
+        public void AddUIBlock(IUIBlock block)
+        {
+            _uiImplementation.AddUIBlock(block);
+        }
+
+        #region React Methods
 
         /// <summary>
         /// Removes the root view.

ReactWindows/ReactNative.Shared/ReactNative.Shared.projitems

@@ -150,6 +150,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)UIManager\BorderedViewParentManager.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)UIManager\BorderExtensions.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)UIManager\ColorHelpers.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)UIManager\IUIBlock.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)UIManager\ReactShadowNodeExtensions.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)UIManager\ReactShadowNodeVisitor.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)UIManager\DependencyObjectExtensions.cs" />

ReactWindows/ReactNative.Shared/UIManager/IUIBlock.cs

@@ -0,0 +1,17 @@
+using ReactNative.UIManager;
+
+namespace ReactNative.UIManager
+{
+    /// <summary>
+    /// Interface that represents a block to execute on the UI thread.
+    /// Exposes NativeViewHierarchyManager for third party libraries.
+    /// </summary>
+    public interface IUIBlock
+    {
+        /// <summary>
+        /// Executes the block.
+        /// </summary>
+        /// <param name="nativeViewHierarchyManager">The native view hierarchy manager.</param>
+        void Execute(NativeViewHierarchyManager nativeViewHierarchyManager);
+    }
+}

ReactWindows/ReactNative.Shared/UIManager/NativeViewHierarchyManager.cs

@@ -575,7 +575,11 @@ namespace ReactNative.UIManager
             throw new NotImplementedException();
         }
 
-        private DependencyObject ResolveView(int tag)
+        /// <summary>
+        /// Resolves a view.
+        /// </summary>
+        /// <param name="tag">The tag of the view.</param>
+        public DependencyObject ResolveView(int tag)
         {
             var view = default(DependencyObject);
             if (!_tagsToViews.TryGetValue(tag, out view))
@@ -587,7 +591,11 @@ namespace ReactNative.UIManager
             return view;
         }
 
-        private IViewManager ResolveViewManager(int tag)
+        /// <summary>
+        /// Resolves a view's view manager.
+        /// </summary>
+        /// <param name="tag">The tag of the view.</param>
+        public IViewManager ResolveViewManager(int tag)
         {
             var viewManager = default(IViewManager);
             if (!_tagsToViewManagers.TryGetValue(tag, out viewManager))

ReactWindows/ReactNative.Shared/UIManager/UIImplementation.cs

@@ -623,6 +623,15 @@ namespace ReactNative.UIManager
             _operationsQueue.EnqueueShowPopupMenu(reactTag, items, error, success);
         }
 
+        /// <summary>
+        /// Enqueues UIBlock to be executed.
+        /// </summary>
+        /// <param name="block">The UI block.</param>
+        public void AddUIBlock(IUIBlock block)
+        {
+            _operationsQueue.EnqueueUIBlock(block);
+        }
+
         /// <summary>
         /// Called when the host receives the suspend event.
         /// </summary>

ReactWindows/ReactNative.Shared/UIManager/UIViewOperationQueue.cs

@@ -164,6 +164,15 @@ namespace ReactNative.UIManager
             EnqueueOperation(() => _nativeViewHierarchyManager.ShowPopupMenu(tag, items, success));
         }
 
+        /// <summary>
+        /// Enqueues a operation to execute a UIBlock.
+        /// </summary>
+        /// <param name="block">The UI block.</param>
+        public void EnqueueUIBlock(IUIBlock block)
+        {
+            EnqueueOperation(() => block.Execute(_nativeViewHierarchyManager));
+        }
+
         /// <summary>
         /// Enqueues an operation to create a view.
         /// </summary>

ReactWindows/ReactNative/UIManager/UIManagerModule.cs

@@ -132,7 +132,17 @@ namespace ReactNative.UIManager
             return tag;
         }
 
-#region React Methods
+        /// <summary>
+        /// Schedule a block to be executed on the UI thread. Useful if you need to execute
+        /// view logic after all currently queued view updates have completed.
+        /// </summary>
+        /// <param name="block">The UI block.</param>
+        public void AddUIBlock(IUIBlock block)
+        {
+            _uiImplementation.AddUIBlock(block);
+        }
+
+        #region React Methods
 
         /// <summary>
         /// Removes the root view.