[Core] Can bind properties in BindableObjects added to static resources in XAML (#58)

Resources that are `BindableObject`s will inherit the `Parent`'s `BindingContext` unless they are `Element`s that have non-null `Parent`s.

1 files changed, 111 insertions, 0 deletions

diff --git a/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Bugzilla23942.xaml.cs b/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Bugzilla23942.xaml.cs
new file mode 100644
index 00000000..efa78941
--- /dev/null
+++ b/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Bugzilla23942.xaml.cs
@@ -0,0 +1,111 @@
+using Xamarin.Forms;
+using Xamarin.Forms.CustomAttributes;
+
+#if UITEST
+using Xamarin.UITest;
+using NUnit.Framework;
+#endif
+
+namespace Xamarin.Forms.Controls.Issues
+{
+	[Preserve(AllMembers = true)]
+	[Issue(IssueTracker.Bugzilla, 23942, "Cannot bind properties in BindableObjects added to static resources in XAML", PlatformAffected.All)]
+	public partial class Bugzilla23942 : TestContentPage
+	{
+		[Preserve(AllMembers = true)]
+		public class TestViewModel : ViewModelBase
+		{
+			string _doesItWork;
+			public string DoesItWork
+			{
+				get
+				{
+					return _doesItWork;
+				}
+				set
+				{
+					_doesItWork = value;
+					OnPropertyChanged();
+				}
+			}
+		}
+
+#if APP
+		public Bugzilla23942()
+		{
+			InitializeComponent();
+		}
+#endif
+
+		private void InitializeView()
+		{
+			TestViewModel vm = new TestViewModel() { DoesItWork = "initial binding works" };
+			BindingContext = vm;
+			vm.DoesItWork = "success";
+		}
+
+		protected override void Init()
+		{
+			InitializeView();
+		}
+
+		protected override void OnAppearing()
+		{
+			base.OnAppearing();
+			var lbl = this.FindByName<Bugzilla23942Label>("label");
+			lbl.Text = lbl.Options.Text;
+		}
+
+#if UITEST
+		[Test]
+		public void Bugzilla23942Test()
+		{
+			RunningApp.WaitForElement(q => q.Marked("success"));
+		}
+#endif
+	}
+
+	[Preserve(AllMembers = true)]
+	public class Bugzilla23942Options : BindableObject
+	{
+		public static readonly BindableProperty TextProperty =
+			BindableProperty.Create(propertyName: nameof(Text),
+									returnType: typeof(string),
+									declaringType: typeof(Bugzilla23942Options),
+									defaultValue: default(string));
+
+		public string Text
+		{
+			get
+			{
+				return (string)GetValue(TextProperty);
+			}
+			set
+			{
+				SetValue(TextProperty, value);
+			}
+		}
+	}
+
+	[Preserve(AllMembers = true)]
+	public class Bugzilla23942Label : Label
+	{
+		public static readonly BindableProperty OptionsProperty =
+			BindableProperty.Create(propertyName: nameof(Options),
+									returnType: typeof(Bugzilla23942Options),
+									declaringType: typeof(Bugzilla23942Label),
+									defaultValue: default(Bugzilla23942Options));
+
+		public Bugzilla23942Options Options
+		{
+			get
+			{
+				return (Bugzilla23942Options)GetValue(OptionsProperty);
+			}
+			set
+			{
+				SetValue(OptionsProperty, value);
+			}
+		}
+	}
+}