Clip controls.

Messes up the treeview item expanded arrows... Probably related to the previous
problem with rendering and rotate transforms.

Perspex.Direct2D1/Media/DrawingContext.cs

@@ -171,6 +171,21 @@ namespace Perspex.Direct2D1.Media
             }
         }
 
+        /// <summary>
+        /// Pushes a clip rectange.
+        /// </summary>
+        /// <param name="clip">The clip rectangle.</param>
+        /// <returns>A disposable used to undo the clip rectangle.</returns>
+        public IDisposable PushClip(Rect clip)
+        {
+            this.renderTarget.PushAxisAlignedClip(clip.ToSharpDX(), AntialiasMode.PerPrimitive);
+
+            return Disposable.Create(() =>
+            {
+                this.renderTarget.PopAxisAlignedClip();
+            });
+        }
+
         /// <summary>
         /// Pushes a matrix transformation.
         /// </summary>

Perspex.Direct2D1/Renderer.cs

@@ -135,6 +135,7 @@ namespace Perspex.Direct2D1
 
                 transform *= Matrix.Translation(visual.Bounds.Position);
 
+                using (context.PushClip(visual.Bounds))
                 using (context.PushTransform(transform))
                 {
                     visual.Render(context);

Perspex.SceneGraph/Media/IDrawingContext.cs

@@ -56,6 +56,13 @@ namespace Perspex.Media
         /// <param name="rect">The rectangle bounds.</param>
         void FillRectange(Brush brush, Rect rect);
 
+        /// <summary>
+        /// Pushes a clip rectange.
+        /// </summary>
+        /// <param name="clip">The clip rectangle.</param>
+        /// <returns>A disposable used to undo the clip rectangle.</returns>
+        IDisposable PushClip(Rect clip);
+
         /// <summary>
         /// Pushes a matrix transformation.
         /// </summary>

TestApplication/Program.cs

@@ -83,8 +83,8 @@ namespace TestApplication
 
         static void Main(string[] args)
         {
-            LogManager.Enable(new TestLogger());
-            LogManager.Instance.LogLayoutMessages = true;
+            //LogManager.Enable(new TestLogger());
+            //LogManager.Instance.LogLayoutMessages = true;
 
             App application = new App
             {