StatefulStackLayout implementation for XF UWP

Author: enisn

src/Xamarin.Forms.InputKit/Platforms/UWP/StatefulStackLayoutRenderer.cs

@@ -0,0 +1,32 @@
+using Plugin.InputKit.Platforms.UWP;
+using Plugin.InputKit.Shared.Layouts;
+using Windows.UI.Xaml.Controls;
+using Xamarin.Forms;
+using Xamarin.Forms.Platform.UWP;
+
+[assembly: ExportRenderer(typeof(StatefulStackLayout), typeof(StatefulStackLayoutRenderer))]
+namespace Plugin.InputKit.Platforms.UWP
+{
+    public class StatefulStackLayoutRenderer : VisualElementRenderer<StackLayout, StackPanel>
+    {
+        protected override void OnElementChanged(ElementChangedEventArgs<StackLayout> e)
+        {
+            base.OnElementChanged(e);
+            if (Control != null)
+            {
+                Control.PointerPressed += Control_PointerPressed;
+                Control.PointerReleased += Control_PointerReleased;
+            }
+        }
+
+        private void Control_PointerPressed(object sender, Windows.UI.Xaml.Input.PointerRoutedEventArgs e)
+        {
+            VisualStateManager.GoToState(Element, "Pressed");
+        }
+
+        private void Control_PointerReleased(object sender, Windows.UI.Xaml.Input.PointerRoutedEventArgs e)
+        {
+            VisualStateManager.GoToState(Element, "Normal");
+        }
+    }
+}