Fix WrapperView Width/HeightSpecification (dotnet#510)

src/Core/src/Handlers/View/ViewHandlerOfT.Tizen.cs

@@ -60,7 +60,11 @@ protected override void SetupContainer()
 				parent?.Remove(PlatformView);
 			}
 
-			ContainerView ??= new WrapperView();
+			ContainerView ??= new WrapperView()
+			{
+				WidthSpecification = PlatformView.WidthSpecification,
+				HeightSpecification = PlatformView.HeightSpecification
+			};
 			PlatformView.UpdatePosition(new Point(0, 0));
 			ContainerView.Content = PlatformView;
 

src/Core/src/Platform/Tizen/NaviPage.cs

@@ -1,17 +1,22 @@
-using Tizen.NUI.BaseComponents;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Collections.Specialized;
+using Tizen.NUI.BaseComponents;
+using Tizen.UIExtensions.Common;
 using Tizen.UIExtensions.NUI;
 using NLayoutGroup = Tizen.NUI.LayoutGroup;
 using NLinearLayout = Tizen.NUI.LinearLayout;
 using NView = Tizen.NUI.BaseComponents.View;
 
-
 namespace Microsoft.Maui
 {
-	public class NaviPage : NView
+	public class NaviPage : NView, IContainable<NView>
 	{
 		TitleView? _titleView;
 		NView? _content;
 
+		ObservableCollection<NView> _children = new ObservableCollection<NView>();
+
 		public NaviPage()
 		{
 			HeightSpecification = LayoutParamPolicies.MatchParent;
@@ -21,6 +26,8 @@ public NaviPage()
 			{
 				LinearOrientation = NLinearLayout.Orientation.Vertical
 			};
+
+			_children.CollectionChanged += OnCollectionChanged;
 		}
 
 		public TitleView? TitleView
@@ -66,5 +73,19 @@ public NaviPage()
 				}
 			}
 		}
+
+		IList<NView> IContainable<NView>.Children => _children;
+
+		void OnCollectionChanged(object? sender, NotifyCollectionChangedEventArgs e)
+		{
+			if (e.Action == NotifyCollectionChangedAction.Add && e.NewItems != null)
+			{
+				Content = e.NewItems[0] as NView;
+			}
+			else if (e.Action == NotifyCollectionChangedAction.Remove || e.Action == NotifyCollectionChangedAction.Reset)
+			{
+				Content = null;
+			}
+		}
 	}
 }