Added RenderManager

Perspex.Windows/Window.cs

@@ -16,16 +16,14 @@ namespace Perspex.Windows
     using Perspex.Input.Raw;
     using Perspex.Layout;
     using Perspex.Platform;
+    using Perspex.Rendering;
     using Perspex.Windows.Input;
     using Perspex.Windows.Interop;
     using Perspex.Windows.Threading;
     using Splat;
 
-    public class Window : ContentControl, ILayoutRoot
+    public class Window : ContentControl, ILayoutRoot, IRendered
     {
-        public static readonly PerspexProperty<double> FontSizeProperty =
-            TextBlock.FontSizeProperty.AddOwner<Window>();
-
         private UnmanagedMethods.WndProc wndProcDelegate;
 
         private string className;
@@ -46,6 +44,7 @@ namespace Perspex.Windows
             this.CreateWindow();
             Size clientSize = this.ClientSize;
             this.LayoutManager = new LayoutManager();
+            this.RenderManager = new RenderManager();
             this.renderer = factory.CreateRenderer(this.Handle, (int)clientSize.Width, (int)clientSize.Height);
             this.inputManager = Locator.Current.GetService<IInputManager>();
             this.Template = ControlTemplate.Create<Window>(this.DefaultTemplate);
@@ -60,6 +59,16 @@ namespace Perspex.Windows
                         this.renderer.Render(this);
                     });
             });
+
+            this.RenderManager.RenderNeeded.Subscribe(x =>
+            {
+                Dispatcher.CurrentDispatcher.BeginInvoke(
+                    DispatcherPriority.Render,
+                    () =>
+                    {
+                        this.renderer.Render(this);
+                    });
+            });
         }
 
         public Size ClientSize
@@ -84,6 +93,12 @@ namespace Perspex.Windows
             private set;
         }
 
+        public IRenderManager RenderManager
+        {
+            get;
+            private set;
+        }
+
         public void Show()
         {
             UnmanagedMethods.ShowWindow(this.Handle, 4);

Perspex/Perspex.csproj

@@ -105,6 +105,9 @@
     <Compile Include="Media\StreamGeometry.cs" />
     <Compile Include="Media\Geometry.cs" />
     <Compile Include="Media\Stretch.cs" />
+    <Compile Include="Rendering\RenderManager.cs" />
+    <Compile Include="Rendering\IRenderManager.cs" />
+    <Compile Include="Rendering\IRendered.cs" />
     <Compile Include="Shapes\Rectangle.cs" />
     <Compile Include="Shapes\Path.cs" />
     <Compile Include="Shapes\Shape.cs" />

Perspex/Rendering/IRenderManager.cs

@@ -0,0 +1,18 @@
+// -----------------------------------------------------------------------
+// <copyright file="IRenderManager.cs" company="Steven Kirk">
+// Copyright 2013 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Rendering
+{
+    using System;
+    using System.Reactive;
+
+    public interface IRenderManager
+    {
+        IObservable<Unit> RenderNeeded { get; }
+
+        void InvalidateRender(IVisual visual);
+    }
+}

Perspex/Rendering/IRendered.cs

@@ -0,0 +1,13 @@
+// -----------------------------------------------------------------------
+// <copyright file="IRendered.cs" company="Steven Kirk">
+// Copyright 2013 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Rendering
+{
+    public interface IRendered
+    {
+        IRenderManager RenderManager { get; }
+    }
+}

Perspex/Rendering/RenderManager.cs

@@ -0,0 +1,27 @@
+// -----------------------------------------------------------------------
+// <copyright file="RenderManager.cs" company="Steven Kirk">
+// Copyright 2013 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Rendering
+{
+    using System;
+    using System.Reactive;
+    using System.Reactive.Subjects;
+
+    public class RenderManager : IRenderManager
+    {
+        private Subject<Unit> renderNeeded = new Subject<Unit>();
+
+        public IObservable<Unit> RenderNeeded
+        {
+            get { return this.renderNeeded; }
+        }
+
+        public void InvalidateRender(IVisual visual)
+        {
+            this.renderNeeded.OnNext(Unit.Default);
+        }
+    }
+}

Perspex/Visual.cs

@@ -12,6 +12,7 @@ namespace Perspex
     using Perspex.Controls;
     using Perspex.Layout;
     using Perspex.Media;
+    using Perspex.Rendering;
     using Splat;
 
     public enum Visibility
@@ -83,12 +84,11 @@ namespace Perspex
 
         public void InvalidateVisual()
         {
-            ILayoutRoot root = this.GetVisualAncestorOrSelf<ILayoutRoot>();
+            IRendered root = this.GetVisualAncestorOrSelf<IRendered>();
 
-            if (root != null && root.LayoutManager != null)
+            if (root != null && root.RenderManager != null)
             {
-                // HACK HACK HACK!
-                root.LayoutManager.InvalidateArrange((ILayoutable)this);
+                root.RenderManager.InvalidateRender(this);
             }
         }