Remove IPage on Tizen (#72)

- Merge IFrameworkElement and IView and Remove IPage (dotnet#1875)

Author: rookiejava

src/Controls/src/Core/Platform/AlertManager/AlertManager.Tizen.cs

@@ -319,9 +319,9 @@ void OnPromptRequested(Page sender, PromptArguments args)
 			prompt.Dismissed += (s, e) => _alerts.Remove(prompt);
 		}
 
-		bool PageIsInThisContext(IPage page)
+		bool PageIsInThisContext(IView sender)
 		{
-			var context = page.Handler?.MauiContext ?? null;
+			var context = sender.Handler?.MauiContext ?? null;
 			return context == MauiContext;
 		}
 	}

src/Core/src/Handlers/NavigationPage/NavigationPageHandler.Tizen.cs

@@ -266,13 +266,13 @@ void UpdateTitle(IView page, NaviItem? item = null)
 
 		string SpanTitle(IView view)
 		{
-			if (view is not IPage page)
+			if (view is not ITitledElement page)
 				return string.Empty;
 			else
 			{
 				var span = new TSpan
 				{
-					Text = page.Title,
+					Text = page.Title??string.Empty,
 					HorizontalTextAlignment = TTextAlignment.Center,
 					//ForegroundColor = VirtualView.BarTextColor.ToNative()
 				};

src/Core/src/Handlers/Page/PageHandler.Tizen.cs

@@ -6,7 +6,7 @@
 
 namespace Microsoft.Maui.Handlers
 {
-	public partial class PageHandler : ViewHandler<IPage, Page>, INativeViewHandler
+	public partial class PageHandler : ViewHandler<IView, Page>, INativeViewHandler
 	{
 		INativeViewHandler? _contentHandler;
 
@@ -35,11 +35,11 @@ protected override void DisconnectHandler(Page nativeView)
 			nativeView.LayoutUpdated -= OnLayoutUpdated;
 		}
 
-		public static void MapTitle(PageHandler handler, IPage page)
+		public static void MapTitle(PageHandler handler, IView page)
 		{
 		}
 
-		public static void MapContent(PageHandler handler, IPage page)
+		public static void MapContent(PageHandler handler, IView page)
 		{
 			handler.UpdateContent();
 		}
@@ -76,11 +76,15 @@ void UpdateContent()
 			_contentHandler?.Dispose();
 			_contentHandler = null;
 
-			NativeView.Children.Add(VirtualView.Content.ToNative(MauiContext));
-			if (VirtualView.Content.Handler is INativeViewHandler thandler)
+			if (VirtualView is IContentView cv && cv.Content is IView view)
 			{
-				thandler?.SetParent(this);
-				_contentHandler = thandler;
+				NativeView.Children.Add(view.ToNative(MauiContext));
+
+				if (view.Handler is INativeViewHandler thandler)
+				{
+					thandler?.SetParent(this);
+					_contentHandler = thandler;
+				}
 			}
 		}
 	}

src/Core/src/Platform/Tizen/SemanticExtensions.cs

@@ -5,7 +5,7 @@ namespace Microsoft.Maui
 {
 	public static partial class SemanticExtensions
 	{
-		public static void SetSemanticFocus(this IFrameworkElement element)
+		public static void SetSemanticFocus(this IView element)
 		{
 			if (element?.Handler?.NativeView == null)
 				throw new NullReferenceException("Can't access view from a null handler");