[Xaml] support native views and native bindings (#266)

Allows including Native views directly in xaml.
Support for ios, android, UWP

3 files changed, 78 insertions, 0 deletions

diff --git a/Xamarin.Forms.Platform.UAP/NativeBindingService.cs b/Xamarin.Forms.Platform.UAP/NativeBindingService.cs
new file mode 100644
index 00000000..e999af2a
--- /dev/null
+++ b/Xamarin.Forms.Platform.UAP/NativeBindingService.cs
@@ -0,0 +1,47 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Windows.UI.Xaml;
+
+#if WINDOWS_UWP
+[assembly: Xamarin.Forms.Dependency(typeof(Xamarin.Forms.Platform.UWP.NativeBindingService))]
+namespace Xamarin.Forms.Platform.UWP
+#else
+[assembly: Xamarin.Forms.Dependency(typeof(Xamarin.Forms.Platform.WinRT.NativeBindingService))]
+namespace Xamarin.Forms.Platform.WinRT
+#endif
+{
+    public class NativeBindingService : Xaml.INativeBindingService
+    {
+        public bool TrySetBinding(object target, string propertyName, BindingBase binding)
+        {
+            var view = target as FrameworkElement;
+            if (view == null)
+                return false;
+            if (target.GetType().GetProperty(propertyName)?.GetMethod == null)
+                return false;
+            view.SetBinding(propertyName, binding);
+            return true;
+        }
+
+        public bool TrySetBinding(object target, BindableProperty property, BindingBase binding)
+        {
+            var view = target as FrameworkElement;
+            if (view == null)
+                return false;
+            view.SetBinding(property, binding);
+            return true;
+        }
+
+        public bool TrySetValue(object target, BindableProperty property, object value)
+        {
+            var view = target as FrameworkElement;
+            if (view == null)
+                return false;
+            view.SetValue(property, value);
+            return true;
+        }
+    }
+}
diff --git a/Xamarin.Forms.Platform.UAP/NativeValueConverterService.cs b/Xamarin.Forms.Platform.UAP/NativeValueConverterService.cs
new file mode 100644
index 00000000..1f0ef68a
--- /dev/null
+++ b/Xamarin.Forms.Platform.UAP/NativeValueConverterService.cs
@@ -0,0 +1,29 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Windows.UI.Xaml;
+
+#if WINDOWS_UWP
+[assembly: Xamarin.Forms.Dependency(typeof(Xamarin.Forms.Platform.UWP.NativeValueConverterService))]
+namespace Xamarin.Forms.Platform.UWP
+#else
+[assembly: Xamarin.Forms.Dependency(typeof(Xamarin.Forms.Platform.WinRT.NativeValueConverterService))]
+namespace Xamarin.Forms.Platform.WinRT
+#endif
+{
+    public class NativeValueConverterService : Xaml.INativeValueConverterService
+    {
+        public bool ConvertTo(object value, Type toType, out object nativeValue)
+        {
+            nativeValue = null;
+            if (typeof(FrameworkElement).IsInstanceOfType(value) && toType.IsAssignableFrom(typeof(View)))
+            {
+                nativeValue = ((FrameworkElement)value).ToView();
+                return true;
+            }
+            return false;
+        }
+    }
+}
diff --git a/Xamarin.Forms.Platform.UAP/Xamarin.Forms.Platform.UAP.csproj b/Xamarin.Forms.Platform.UAP/Xamarin.Forms.Platform.UAP.csproj
index 81ec3ff3..4f383064 100644
--- a/Xamarin.Forms.Platform.UAP/Xamarin.Forms.Platform.UAP.csproj
+++ b/Xamarin.Forms.Platform.UAP/Xamarin.Forms.Platform.UAP.csproj
@@ -189,6 +189,8 @@
       <Link>LayoutExtensions.cs</Link>
     </Compile>
     <Compile Include="IToolBarForegroundBinder.cs" />
+    <Compile Include="NativeBindingService.cs" />
+    <Compile Include="NativeValueConverterService.cs" />
     <Compile Include="SearchBarRenderer.cs" />
     <Compile Include="..\Xamarin.Forms.Platform.WinRT\TextAlignmentToHorizontalAlignmentConverter.cs">
       <Link>TextAlignmentToHorizontalAlignmentConverter.cs</Link>