1 files changed, 88 insertions, 0 deletions
diff --git a/Xamarin.Forms.Platform.WP8/VisualElementPackager.cs b/Xamarin.Forms.Platform.WP8/VisualElementPackager.cs
new file mode 100644
index 00000000..65f589fc
--- /dev/null
+++ b/Xamarin.Forms.Platform.WP8/VisualElementPackager.cs
@@ -0,0 +1,88 @@
+using System;
+using System.Windows;
+using System.Windows.Controls;
+
+namespace Xamarin.Forms.Platform.WinPhone
+{
+	public class VisualElementPackager
+	{
+		readonly Panel _panel;
+		readonly IVisualElementRenderer _renderer;
+		bool _loaded;
+
+		public VisualElementPackager(IVisualElementRenderer renderer)
+		{
+			if (renderer == null)
+				throw new ArgumentNullException("renderer");
+
+			_panel = renderer.ContainerElement as Panel;
+			if (_panel == null)
+				throw new ArgumentException("Renderer's container element must be a Panel or Panel subclass");
+
+			_renderer = renderer;
+		}
+
+		public void Load()
+		{
+			if (_loaded)
+				return;
+
+			_loaded = true;
+			_renderer.Element.ChildAdded += HandleChildAdded;
+			_renderer.Element.ChildRemoved += HandleChildRemoved;
+			_renderer.Element.ChildrenReordered += HandleChildrenReordered;
+
+			foreach (Element child in _renderer.Element.LogicalChildren)
+				HandleChildAdded(_renderer.Element, new ElementEventArgs(child));
+		}
+
+		void EnsureZIndex()
+		{
+			for (var index = 0; index < _renderer.Element.LogicalChildren.Count; index++)
+			{
+				var child = (VisualElement)_renderer.Element.LogicalChildren[index];
+				IVisualElementRenderer r = Platform.GetRenderer(child);
+				if (r == null)
+					continue;
+				// Even though this attached property is defined on Canvas, it actually works on all Panels
+				// Why? Microsoft.
+				Canvas.SetZIndex(r.ContainerElement, index + 1);
+			}
+		}
+
+		void HandleChildAdded(object sender, ElementEventArgs e)
+		{
+			var view = e.Element as VisualElement;
+
+			if (view == null)
+				return;
+
+			IVisualElementRenderer renderer;
+			Platform.SetRenderer(view, renderer = Platform.CreateRenderer(view));
+
+			_panel.Children.Add(renderer.ContainerElement);
+
+			EnsureZIndex();
+		}
+
+		void HandleChildRemoved(object sender, ElementEventArgs e)
+		{
+			var view = e.Element as VisualElement;
+
+			if (view == null)
+				return;
+
+			var renderer = Platform.GetRenderer(view) as UIElement;
+
+			if (renderer != null)
+				_panel.Children.Remove(renderer);
+
+			EnsureZIndex();
+		}
+
+		void HandleChildrenReordered(object sender, EventArgs e)
+		{
+			EnsureZIndex();
+		}
+	}
+}
+\ No newline at end of file