[WinRT] Fix MDP and TabbedPage Appearing/Disappearing (#387)

Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Bugzilla40408.cs

@@ -0,0 +1,94 @@
+using Xamarin.Forms.CustomAttributes;
+using Xamarin.Forms.Internals;
+using System;
+
+#if UITEST
+using Xamarin.UITest;
+using NUnit.Framework;
+#endif
+
+namespace Xamarin.Forms.Controls.Issues
+{
+	[Preserve(AllMembers = true)]
+	[Issue(IssueTracker.Bugzilla, 40408, "MasterDetailPage and TabbedPage only firing Appearing once", PlatformAffected.WinRT)]
+	public class Bugzilla40408 : TestNavigationPage
+	{
+		protected override void Init()
+		{
+			BarBackgroundColor = Color.Red;
+			
+			var contentPage2 = new ContentPage();
+			contentPage2.Title = "Page 2";
+			contentPage2.BackgroundColor = Color.Green;
+
+			contentPage2.Appearing += ContentPage2_Appearing;
+			contentPage2.Disappearing += ContentPage2_Disappearing;
+			
+			var tabbedPage1 = new TabbedPage();
+			tabbedPage1.Appearing += TabbedPage1_Appearing;
+			tabbedPage1.Disappearing += TabbedPage1_Disappearing;
+
+			var contentPage3 = new ContentPage() { Title = "Page 3" };
+			contentPage3.BackgroundColor = Color.Pink;
+			tabbedPage1.Children.Add(contentPage3);
+			
+			var masterDetailPage1 = new MasterDetailPage();
+			masterDetailPage1.Title = "Page 3";
+			var master1 = new ContentPage();
+			master1.BackgroundColor = Color.Yellow;
+			master1.Title = "Master 1";
+			var detail1 = new ContentPage();
+			detail1.Title = "Detail 1";
+			detail1.BackgroundColor = Color.Purple;
+			masterDetailPage1.Master = master1;
+			masterDetailPage1.Detail = detail1;
+			masterDetailPage1.BackgroundColor = Color.Yellow;
+
+			masterDetailPage1.Appearing += MasterDetailPage1_Appearing;
+			masterDetailPage1.Disappearing += MasterDetailPage1_Disappearing;
+			
+			var contentPage1 = new ContentPage();
+			SetHasBackButton(contentPage1, true);
+			contentPage1.BackgroundColor = Color.Blue;
+			contentPage1.Title = "Page 1";
+			var stack = new StackLayout();
+			contentPage1.Content = stack;
+
+			stack.Children.Add(new Button() { Text = "View Content", Command = new Command(() => PushAsync(contentPage2)) });
+			stack.Children.Add(new Button() { Text = "View Master Detail", Command = new Command(() => PushAsync(masterDetailPage1)) });
+			stack.Children.Add(new Button() { Text = "View Tabbed Page", Command = new Command(() => PushAsync(tabbedPage1)) });
+			
+			PushAsync(contentPage1);
+		}
+
+		void ContentPage2_Disappearing(object sender, EventArgs e)
+		{
+			DisplayAlert("Disappearing", "ContentPage", "OK");
+		}
+
+		void TabbedPage1_Disappearing(object sender, EventArgs e)
+		{
+			DisplayAlert("Disappearing", "TabbedPage", "OK");
+		}
+
+		void MasterDetailPage1_Disappearing(object sender, EventArgs e)
+		{
+			DisplayAlert("Disappearing", "MasterDetailPage", "OK");
+		}
+
+		void TabbedPage1_Appearing(object sender, EventArgs e)
+		{
+			DisplayAlert("Appearing", "TabbedPage", "OK");
+		}
+
+		void ContentPage2_Appearing(object sender, EventArgs e)
+		{
+			DisplayAlert("Appearing", "ContentPage", "OK");
+		}
+
+		void MasterDetailPage1_Appearing(object sender, EventArgs e)
+		{
+			DisplayAlert("Appearing", "MasterDetailPage", "OK");
+		}
+	}
+}

Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Xamarin.Forms.Controls.Issues.Shared.projitems

@@ -106,6 +106,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla40185.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla40333.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla31806.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Bugzilla40408.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla40858.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla40824.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla40911.cs" />

Xamarin.Forms.Platform.WinRT.Phone/TabbedPageRenderer.cs

@@ -146,6 +146,8 @@ namespace Xamarin.Forms.Platform.WinRT
 				return;
 
 			_disposed = true;
+
+			PageController?.SendDisappearing();
 			SetElement(null);
 			Tracker = null;
 		}

Xamarin.Forms.Platform.WinRT.Tablet/TabbedPageRenderer.cs

@@ -155,6 +155,8 @@ namespace Xamarin.Forms.Platform.WinRT
 				return;
 
 			_disposed = true;
+
+			PageController?.SendDisappearing();
 			SetElement(null);
 			Tracker = null;
 		}

Xamarin.Forms.Platform.WinRT/MasterDetailPageRenderer.cs

@@ -143,6 +143,7 @@ namespace Xamarin.Forms.Platform.WinRT
 
 			_disposed = true;
 
+			PageController?.SendDisappearing();
 			SetElement(null);
 		}