Add ShellSearchView (#121)

* Add ShellSearchView

* Fix the layout issue in ShellSearchResultList

* Enable nullable

* Fix maximum height of ShellSearchResultList

src/Controls/src/Core/Platform/Tizen/Shell/ShellNavBar.cs

@@ -17,7 +17,10 @@ public class ShellNavBar : EBox, IFlyoutBehaviorObserver, IDisposable
 		TImage _menuIcon = null;
 		TButton _menuButton = null;
 		TLabel _title = null;
+		ShellSearchView _searchView = null;
 		EvasObject _nativeTitleView = null;
+
+		SearchHandler _searchHandler = null;
 		View _titleView = null;
 		Page _page = null;
 
@@ -102,6 +105,20 @@ public FlyoutBehavior FlyoutBehavior
 			}
 		}
 
+		public SearchHandler SearchHandler
+		{
+			get
+			{
+				return _searchHandler;
+			}
+			set
+			{
+				_searchHandler = value;
+				UpdateSearchHandler(_searchHandler);
+				UpdateChildren();
+			}
+		}
+
 		public View TitleView
 		{
 			get
@@ -177,7 +194,7 @@ public void SetPage(Page page)
 		{
 			_page = page;
 			Title = page.Title;
-			//SearchHandler = Shell.GetSearchHandler(page);
+			SearchHandler = Shell.GetSearchHandler(page);
 			TitleView = Shell.GetTitleView(page);
 			UpdateMenuIcon();
 		}
@@ -284,17 +301,42 @@ void UpdateTitleView(View titleView)
 			}
 		}
 
+		void UpdateSearchHandler(SearchHandler handler)
+		{
+			if (_searchView != null)
+			{
+				UnPack(_searchView.NativeView);
+				_searchView.Dispose();
+				_searchView = null;
+			}
+
+			if (handler != null)
+			{
+				_searchView = new ShellSearchView(handler, MauiContext);
+				_searchView.NativeView.Show();
+				PackEnd(_searchView.NativeView);
+			}
+		}
+
 		void UpdateChildren()
 		{
-			if (_titleView != null)
+			if (_searchHandler != null)
+			{
+				_searchView.NativeView.Show();
+				_title?.Hide();
+				_nativeTitleView?.Hide();
+			}
+			else if (_titleView != null)
 			{
 				_nativeTitleView.Show();
 				_title?.Hide();
+				_searchView?.NativeView?.Hide();
 			}
 			else
 			{
 				_title.Show();
 				_nativeTitleView?.Hide();
+				_searchView?.NativeView?.Hide();
 			}
 		}
 
@@ -324,7 +366,11 @@ void OnLayout()
 			contentBound.Width -= (menuBound.Width + menuMargin + titleHMargin * 2);
 			contentBound.Height -= titleVMargin * 2;
 
-			if (_titleView != null)
+			if (_searchView != null)
+			{
+				_searchView.NativeView.Geometry = contentBound;
+			}
+			else if (_titleView != null)
 			{
 				_nativeTitleView.Geometry = contentBound;
 			}

src/Controls/src/Core/Platform/Tizen/Shell/ShellSearchResultList.cs

@@ -0,0 +1,99 @@
+using System;
+using System.Collections.Generic;
+using ElmSharp;
+using Tizen.UIExtensions.ElmSharp;
+using EColor = ElmSharp.Color;
+
+namespace Microsoft.Maui.Controls.Platform
+{
+	public class ShellSearchResultList : GenList
+	{
+		GenItemClass _defaultClass = null;
+		IReadOnlyList<object> _itemsSource;
+
+		public ShellSearchResultList(IMauiContext context) : base(context?.Context?.BaseLayout)
+		{
+			MauiContext = context;
+
+			SetAlignment(-1, -1);
+			SetWeight(1, 1);
+			AllowFocus(true);
+
+			Homogeneous = true;
+			SelectionMode = GenItemSelectionMode.Always;
+			BackgroundColor = EColor.White;
+
+			_defaultClass = new GenItemClass(ThemeConstants.GenItemClass.Styles.Full)
+			{
+				GetContentHandler = GetContent,
+			};
+		}
+
+		public int Height { get; private set; }
+
+		public IReadOnlyList<object> ItemsSource
+		{
+			get => _itemsSource;
+			set
+			{
+				Clear();
+				Height = 0;
+
+				_itemsSource = value;
+				foreach (var item in _itemsSource)
+				{
+					Append(item);
+				}
+			}
+		}
+
+		protected IMauiContext MauiContext { get; private set; }
+
+		protected EvasObject NativeParent
+		{
+			get => MauiContext?.Context?.BaseLayout;
+		}
+
+		public void UpdateLayout()
+		{
+			if (FirstItem != null && Height == 0)
+			{
+				var view = FirstItem.Data as View;
+				var native = view.ToNative(MauiContext);
+				var measured = view.Measure(DPExtensions.ConvertToScaledDP(Geometry.Width), double.PositiveInfinity);
+				Height = DPExtensions.ConvertToScaledPixel(measured.Request.Height);
+			}
+
+			var bound = Geometry;
+			bound.Height = Math.Min(Height * _itemsSource.Count, bound.Width);
+			Geometry = bound;
+
+			UpdateRealizedItems();
+		}
+
+		public DataTemplate ItemTemplate { get; set; }
+
+		EvasObject GetContent(object data, string part)
+		{
+			var view = data as View;
+			var native = view.ToNative(MauiContext);
+
+			if (Height == 0)
+			{
+				var measured = view.Measure(DPExtensions.ConvertToScaledDP(Geometry.Width), double.PositiveInfinity);
+				Height = DPExtensions.ConvertToScaledPixel(measured.Request.Height);
+			}
+
+			native.MinimumHeight = Height;
+			return native;
+		}
+
+		void Append(object data)
+		{
+			var view = ItemTemplate.CreateContent() as View;
+			view.Parent = Shell.Current;
+			view.BindingContext = data;
+			Append(_defaultClass, view);
+		}
+	}
+}