Evolve feature branch (#117)

* Initial import of evolve features

* [Android] Add Xamarin.Forms.Platform.Android.AppLinks project

* [iOS] Fix issues with c# 6 features on iOS AppLinks

* Added naive stanza to update-docs-windows.bat to produce Pages docs. Not tested. (#69)

* Update packages

* Add AppLinks android nuspec and fix linker issues

* Fix build

* Fix nusepc

* Fix nuspec

* Update android support nugets to 23.2.1

* Update Xamarin.UITest

* Add CardView

* [iOS] Fix app link for CoreSpotlight

* [Android] Update AppLinks android support libs

* Add Newtonsoft.Json dependency to nuspec

* Fix NRE when setting ControlTemplate to null

* Move to ModernHttpClient for download

* Try fix build

* Preserve android app links

* Fix margin issue

* General coding and simple fixes

1 files changed, 76 insertions, 0 deletions

diff --git a/Xamarin.Forms.Pages/DataView.cs b/Xamarin.Forms.Pages/DataView.cs
new file mode 100644
index 00000000..983328ee
--- /dev/null
+++ b/Xamarin.Forms.Pages/DataView.cs
@@ -0,0 +1,76 @@
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Xamarin.Forms.Pages
+{
+	public class DataView : ContentView, IDataSourceProvider
+	{
+		public static readonly BindableProperty DataProperty = BindableProperty.Create(nameof(Data), typeof(IEnumerable<IDataItem>), typeof(DataView), default(IEnumerable<IDataItem>));
+
+		public static readonly BindableProperty DataSourceProperty = BindableProperty.Create(nameof(DataSource), typeof(IDataSource), typeof(DataView), null, propertyChanged: OnDataSourceChanged);
+
+		public static readonly BindableProperty DefaultItemTemplateProperty = BindableProperty.Create(nameof(DefaultItemTemplate), typeof(DataTemplate), typeof(DataView), default(DataTemplate));
+
+		readonly HashSet<string> _maskedKeys = new HashSet<string>();
+
+		public DataView()
+		{
+			SetBinding(DataProperty, new Binding("DataSource.Data", source: this));
+		}
+
+		public IEnumerable<IDataItem> Data
+		{
+			get { return (IEnumerable<IDataItem>)GetValue(DataProperty); }
+			set { SetValue(DataProperty, value); }
+		}
+
+		public DataTemplate DefaultItemTemplate
+		{
+			get { return (DataTemplate)GetValue(DefaultItemTemplateProperty); }
+			set { SetValue(DefaultItemTemplateProperty, value); }
+		}
+
+		public IDataSource DataSource
+		{
+			get { return (IDataSource)GetValue(DataSourceProperty); }
+			set { SetValue(DataSourceProperty, value); }
+		}
+
+		void IDataSourceProvider.MaskKey(string key)
+		{
+			_maskedKeys.Add(key);
+			IDataSource dataSource = DataSource;
+			if (dataSource != null && !dataSource.MaskedKeys.Contains(key))
+			{
+				dataSource.MaskKey(key);
+			}
+		}
+
+		void IDataSourceProvider.UnmaskKey(string key)
+		{
+			_maskedKeys.Remove(key);
+			DataSource?.UnmaskKey(key);
+		}
+
+		static void OnDataSourceChanged(BindableObject bindable, object oldValue, object newValue)
+		{
+			var dataView = (DataView)bindable;
+			var dataSource = (IDataSource)newValue;
+			var oldSource = (IDataSource)oldValue;
+
+			if (oldSource != null)
+			{
+				foreach (string key in dataView._maskedKeys)
+					oldSource.UnmaskKey(key);
+			}
+
+			if (dataSource != null)
+			{
+				foreach (string key in dataView._maskedKeys)
+				{
+					dataSource.MaskKey(key);
+				}
+			}
+		}
+	}
+}
\ No newline at end of file