#7956 [Shell] Unable to focus and unfocus search handler for Android

Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Issue7956.xaml

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<local:TestShell xmlns="http://xamarin.com/schemas/2014/forms"
+            xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+            xmlns:d="http://xamarin.com/schemas/2014/forms/design"
+            xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+            mc:Ignorable="d"
+            xmlns:local="clr-namespace:Xamarin.Forms.Controls"
+            xmlns:issues="clr-namespace:Xamarin.Forms.Controls.Issues"
+            x:Class="Xamarin.Forms.Controls.Issues.Issue7956">
+
+    <ShellContent Title="SearchHandler Focus">
+        <ContentPage>
+            <StackLayout>
+                <Label Text="Please, click on the Shell SearchHandler search box above, in order to fire the Focus EventHandler. This test will pass if: on focus, you see another text below saying 'Focus EventHandler triggered!'; on unfocus, you see another text below saying 'Focus EventHandler triggered!'. If nothing happens, or only one of the two previous cases happen, this test would have failed." 
+                       Padding="10"/>
+                <Label x:Name="lblFocus" Text="Focus EventHandler triggered!'" IsVisible="false" />
+                <Label x:Name="lblUnfocus" Text="Unfocus EventHandler triggered!'" IsVisible="false" />
+            </StackLayout>
+            <Shell.SearchHandler>
+                <SearchHandler Focused="SearchHandler_Focused" Unfocused="SearchHandler_Unfocused"/>
+            </Shell.SearchHandler>
+        </ContentPage>
+    </ShellContent>
+
+</local:TestShell>

Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Issue7956.xaml.cs

@@ -0,0 +1,42 @@
+using System.Collections.Generic;
+using Xamarin.Forms.CustomAttributes;
+using Xamarin.Forms.Internals;
+
+#if UITEST
+using Xamarin.Forms.Core.UITests;
+using Xamarin.UITest;
+using NUnit.Framework;
+#endif
+
+namespace Xamarin.Forms.Controls.Issues
+{
+	[Preserve(AllMembers = true)]
+	[Issue(IssueTracker.Github, 7956, "[Shell] Unable to focus and unfocus search handler for Android",
+		PlatformAffected.Android)]
+	public partial class Issue7956 : TestShell
+	{
+		public Issue7956()
+		{
+			BindingContext = this;
+#if APP
+			InitializeComponent();
+#endif
+		}
+
+		protected override void Init()
+		{
+
+		}
+
+		private void SearchHandler_Focused(object sender, System.EventArgs e)
+		{
+			lblFocus.IsVisible = true;
+			lblUnfocus.IsVisible = false;
+		}
+		private void SearchHandler_Unfocused(object sender, System.EventArgs e)
+		{
+			lblFocus.IsVisible = false;
+			lblUnfocus.IsVisible = true;
+		}
+	}
+}

Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Issue7956_1.xaml

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<local:TestShell xmlns="http://xamarin.com/schemas/2014/forms"
+            xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+            xmlns:d="http://xamarin.com/schemas/2014/forms/design"
+            xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+            mc:Ignorable="d"
+            xmlns:local="clr-namespace:Xamarin.Forms.Controls"
+            xmlns:issues="clr-namespace:Xamarin.Forms.Controls.Issues"
+            x:Class="Xamarin.Forms.Controls.Issues.Issue7956_1">
+
+    <ShellContent Title="SearchHandler Focus">
+        <ContentPage>
+            <StackLayout>
+                <Label Text="Please, click on the Shell SearchHandler search box above, in order to fire the Focus EventHandler. This test will pass if: on focus, you see another text below saying 'Focus EventHandler triggered!'; on unfocus, you see another text below saying 'Focus EventHandler triggered!'. If nothing happens, or only one of the two previous cases happen, this test would have failed." 
+                       Padding="10"/>
+                <Label x:Name="lblFocus" Text="Focus EventHandler triggered!'" IsVisible="false" />
+                <Label x:Name="lblUnfocus" Text="Unfocus EventHandler triggered!'" IsVisible="false" />
+            </StackLayout>
+            <Shell.SearchHandler>
+                <issues:InheritedSearchHandler Focused="SearchHandler_Focused" Unfocused="SearchHandler_Unfocused"/>
+            </Shell.SearchHandler>
+        </ContentPage>
+    </ShellContent>
+
+</local:TestShell>

Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Issue7956_1.xaml.cs

@@ -0,0 +1,54 @@
+using System.Collections.Generic;
+using Xamarin.Forms.CustomAttributes;
+using Xamarin.Forms.Internals;
+
+#if UITEST
+using Xamarin.Forms.Core.UITests;
+using Xamarin.UITest;
+using NUnit.Framework;
+#endif
+
+namespace Xamarin.Forms.Controls.Issues
+{
+	[Preserve(AllMembers = true)]
+	[Issue(IssueTracker.Github, 7956, "[Shell] Unable to focus and unfocus search handler for Android",
+		PlatformAffected.Android, issueTestNumber:1)]
+	public partial class Issue7956_1 : TestShell
+	{
+		public Issue7956_1()
+		{
+			BindingContext = this;
+#if APP
+			InitializeComponent();
+#endif
+		}
+
+		protected override void Init()
+		{
+
+		}
+
+		private void SearchHandler_Focused(object sender, System.EventArgs e)
+		{
+			lblFocus.IsVisible = true;
+			lblUnfocus.IsVisible = false;
+		}
+		private void SearchHandler_Unfocused(object sender, System.EventArgs e)
+		{
+			lblFocus.IsVisible = false;
+			lblUnfocus.IsVisible = true;
+		}
+	}
+
+	public class InheritedSearchHandler : SearchHandler
+	{
+		protected override void OnFocused()
+		{
+			base.OnFocused();
+		}
+		protected override void OnUnfocus()
+		{
+			base.OnUnfocus();
+		}
+	}
+}

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

@@ -21,6 +21,13 @@
     <Compile Include="$(MSBuildThisFileDirectory)Issue13126.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Issue13126_2.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Issue13551.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Issue7956.xaml.cs">
+      <DependentUpon>Issue7956.xaml</DependentUpon>
+    </Compile>
+    <Compile Include="$(MSBuildThisFileDirectory)Issue7956_1.xaml.cs">
+      <DependentUpon>Issue7956_1.xaml</DependentUpon>
+      <SubType>Code</SubType>
+    </Compile>
     <Compile Include="$(MSBuildThisFileDirectory)RadioButtonTemplateFromStyle.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)ShellSearchHandlerItemSizing.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)ShellWithCustomRendererDisabledAnimations.cs" />
@@ -2708,4 +2715,16 @@
       <Generator>MSBuild:UpdateDesignTimeXaml</Generator>
     </EmbeddedResource>
   </ItemGroup>
+  <ItemGroup>
+    <EmbeddedResource Include="$(MSBuildThisFileDirectory)Issue7956.xaml">
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:UpdateDesignTimeXaml</Generator>
+    </EmbeddedResource>
+  </ItemGroup>
+  <ItemGroup>
+    <EmbeddedResource Include="$(MSBuildThisFileDirectory)Issue7956_1.xaml">
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:UpdateDesignTimeXaml</Generator>
+    </EmbeddedResource>
+  </ItemGroup>
 </Project>

Xamarin.Forms.Platform.Android/Renderers/ShellSearchView.cs

@@ -134,6 +134,7 @@ protected override void Dispose(bool disposing)
 				SearchHandler.PropertyChanged -= OnSearchHandlerPropertyChanged;
 
 				_textBlock.ItemClick -= OnTextBlockItemClicked;
+				_textBlock.FocusChange -= OnSearchHandlerFocusChange;
 				_textBlock.RemoveTextChangedListener(this);
 				_textBlock.SetOnEditorActionListener(null);
 				_textBlock.DropDownBackground.Dispose();
@@ -209,6 +210,7 @@ protected virtual void LoadView(SearchHandler searchHandler)
 			_textBlock.Adapter = new ShellSearchViewAdapter(SearchHandler, _shellContext);
 			_textBlock.ItemClick += OnTextBlockItemClicked;
 			_textBlock.SetDropDownBackgroundDrawable(new ClipDrawableWrapper(_textBlock.DropDownBackground));
+			_textBlock.FocusChange += OnSearchHandlerFocusChange;
 
 			// A note on accessibility. The _textBlocks hint is what android defaults to reading in the screen
 			// reader. Therefore, we do not need to set something else.
@@ -236,6 +238,11 @@ protected virtual void LoadView(SearchHandler searchHandler)
 			linearLayout.Dispose();
 		}
 
+		void OnSearchHandlerFocusChange(object sender, FocusChangeEventArgs e)
+		{
+			if(SearchHandler != null) SearchHandler.SetValue(SearchHandler.IsFocusedPropertyKey, e.HasFocus);
+		}
+
 		protected virtual void OnSearchHandlerPropertyChanged(object sender, PropertyChangedEventArgs e)
 		{
 			if (e.PropertyName == SearchHandler.IsSearchEnabledProperty.PropertyName)