[WinRT/UWP] Do not allow IsPresented use in Split mode on desktop (#707)

Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Bugzilla51236.cs

@@ -0,0 +1,104 @@
+using Xamarin.Forms.CustomAttributes;
+using Xamarin.Forms.Internals;
+
+#if UITEST
+using Xamarin.UITest;
+using NUnit.Framework;
+#endif
+
+namespace Xamarin.Forms.Controls.Issues
+{
+	[Preserve(AllMembers = true)]
+	[Issue(IssueTracker.Bugzilla, 51236, "[WinRT/UWP] Setting a MasterDetailPage's IsPresented to false should not be allowed in Split mode", PlatformAffected.WinRT)]
+	public class Bugzilla51236 : TestMasterDetailPage
+	{
+		protected override void Init()
+		{
+			var listView = new ListView
+			{
+				ItemsSource = new string[] { "A", "B", "C" },
+				ItemTemplate = new DataTemplate(() =>
+				{
+					var cell = new ViewCell();
+					cell.View = new StackLayout
+					{
+						Children =
+						{
+							new Label { Text = "Click to set IsPresented to false" }
+						}
+					};
+					return cell;
+				}),
+			};
+
+			IsPresented = false;
+			listView.ItemTapped += (s, e) =>
+			{
+				IsPresented = false;
+				listView.SelectedItem = null;
+				Detail = new ContentPage
+				{
+					Title = "Detail",
+					Content = new StackLayout
+					{
+						Children =
+						{
+							new Button
+							{
+								Text = "Set IsPresented to true",
+								Command = new Command(() => IsPresented = true)
+							}
+						}
+					}
+				};
+			};
+
+			Master = new ContentPage
+			{
+				Title = "Master",
+				Content = new StackLayout
+				{
+					Children =
+					{
+						listView,
+						new Button
+						{
+							Text = "Set MasterBehavior to Popover",
+							Command = new Command(() =>
+							{
+								MasterBehavior = MasterBehavior.Popover;
+								IsPresented = false;
+							})
+						},
+						new Button
+						{
+							Text = "Set MasterBehavior to Split",
+							Command = new Command(() => MasterBehavior = MasterBehavior.Split)
+						},
+						new Button
+						{
+							Text = "Set MasterBehavior to SplitOnLandscape",
+							Command = new Command(() => MasterBehavior = MasterBehavior.SplitOnLandscape)
+						},
+					}
+				}
+			};
+
+			Detail = new ContentPage
+			{
+				Title = "Detail",
+				Content = new StackLayout
+				{
+					Children =
+					{
+						new Button
+						{
+							Text = "Set IsPresented to true",
+							Command = new Command(() => IsPresented = true)
+						}
+					}
+				}
+			};
+		}
+	}
+}

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

@@ -172,6 +172,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla47923.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla48236.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla47971.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Bugzilla51236.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla51238.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla51642.xaml.cs">
       <DependentUpon>Bugzilla51642.xaml</DependentUpon>

Xamarin.Forms.Platform.UAP/MasterDetailPageRenderer.cs

@@ -163,7 +163,7 @@ protected virtual void OnElementChanged(ElementChangedEventArgs<MasterDetailPage
 
 		protected virtual void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
 		{
-			if (e.PropertyName == MasterDetailPage.IsPresentedProperty.PropertyName)
+			if (e.PropertyName == MasterDetailPage.IsPresentedProperty.PropertyName || e.PropertyName == MasterDetailPage.MasterBehaviorProperty.PropertyName)
 				UpdateIsPresented();
 			else if (e.PropertyName == "Master")
 				UpdateMaster();
@@ -286,6 +286,11 @@ void UpdateDetailTitle()
 
 		void UpdateIsPresented()
 		{
+			// Ignore the IsPresented value being set to false for Split mode on desktop and allow the master
+			// view to be made initially visible
+			if (Device.Idiom == TargetIdiom.Desktop && Control.IsPaneOpen && Element.MasterBehavior != MasterBehavior.Popover)
+				return;
+
 			Control.IsPaneOpen = Element.IsPresented;
 		}
 

Xamarin.Forms.Platform.WinRT/MasterDetailPageRenderer.cs

@@ -168,7 +168,10 @@ protected virtual void OnElementPropertyChanged(object sender, PropertyChangedEv
 			else if (e.PropertyName == MasterDetailPage.IsPresentedProperty.PropertyName)
 				UpdateIsPresented();
 			else if (e.PropertyName == MasterDetailPage.MasterBehaviorProperty.PropertyName)
+			{
 				UpdateBehavior();
+				UpdateIsPresented();
+			}
 			else if (e.PropertyName == Page.TitleProperty.PropertyName)
 				UpdateTitle();
 		}
@@ -276,6 +279,11 @@ void UpdateBounds(Windows.Foundation.Size constraint, bool isPresented)
 
 		void UpdateIsPresented()
 		{
+			// Ignore the IsPresented value being set to false for Split mode on desktop and allow the master
+			// view to be made initially visible
+			if ((Device.Idiom == TargetIdiom.Desktop || Device.Idiom == TargetIdiom.Tablet) && _container.IsMasterVisible && !Element.IsPresented && Element.MasterBehavior != MasterBehavior.Popover)
+				return;
+
 			UpdateBehavior();
 
 			bool isPresented = !GetIsMasterAPopover() || Element.IsPresented;