[Windows] Fix SearchHandler does not focus when ShowSoftInputAsync is called

src/Controls/src/Core/Handlers/Shell/ShellItemHandler.Windows.cs

@@ -107,7 +107,11 @@ protected override void DisconnectHandler(FrameworkElement platformView)
 				_currentShellSection.PropertyChanged -= OnCurrentShellSectionPropertyChanged;
 
 			if (_currentSearchHandler != null)
+			{
 				_currentSearchHandler.PropertyChanged -= OnCurrentSearchHandlerPropertyChanged;
+				_currentSearchHandler.ShowSoftInputRequested -= OnShowSoftInputRequested;
+				_currentSearchHandler.HideSoftInputRequested -= OnHideSoftInputRequested;
+			}
 
 			if (_shellItem?.Parent is IShellController controller)
 			{
@@ -303,6 +307,8 @@ void UpdateSearchHandler()
 				if (_currentSearchHandler is not null)
 				{
 					_currentSearchHandler.PropertyChanged -= OnCurrentSearchHandlerPropertyChanged;
+					_currentSearchHandler.ShowSoftInputRequested -= OnShowSoftInputRequested;
+					_currentSearchHandler.HideSoftInputRequested -= OnHideSoftInputRequested;
 				}
 
 				_currentSearchHandler = newSearchHandler;
@@ -321,6 +327,9 @@ void UpdateSearchHandler()
 						mauiNavView.AutoSuggestBox = autoSuggestBox;
 					}
 
+					_currentSearchHandler.ShowSoftInputRequested += OnShowSoftInputRequested;
+					_currentSearchHandler.HideSoftInputRequested += OnHideSoftInputRequested;
+
 					autoSuggestBox.PlaceholderText = _currentSearchHandler.Placeholder;
 					autoSuggestBox.IsEnabled = _currentSearchHandler.IsSearchEnabled;
 					autoSuggestBox.ItemsSource = CreateSearchHandlerItemsSource();
@@ -363,6 +372,29 @@ void OnSearchBoxLostFocus(object sender, RoutedEventArgs e)
 			_currentSearchHandler?.SetIsFocused(false);
 		}
 
+		void OnShowSoftInputRequested(object? sender, EventArgs e)
+		{
+			if (PlatformView is not NavigationView mauiNavView || mauiNavView.AutoSuggestBox is not { } autoSuggestBox)
+				return;
+
+			autoSuggestBox.Focus(FocusState.Programmatic);
+		}
+
+		void OnHideSoftInputRequested(object? sender, EventArgs e)
+		{
+			if (PlatformView is not NavigationView mauiNavView || mauiNavView.AutoSuggestBox is not { } autoSuggestBox)
+				return;
+
+			if (!autoSuggestBox.IsEnabled)
+				return;
+
+			var isTabStop = autoSuggestBox.IsTabStop;
+			autoSuggestBox.IsTabStop = false;
+			autoSuggestBox.IsEnabled = false;
+			autoSuggestBox.IsEnabled = true;
+			autoSuggestBox.IsTabStop = isTabStop;
+		}
+
 		void OnSearchBoxTextChanged(Microsoft.UI.Xaml.Controls.AutoSuggestBox sender, Microsoft.UI.Xaml.Controls.AutoSuggestBoxTextChangedEventArgs args)
 		{
 			if (_currentSearchHandler == null)
@@ -645,4 +677,4 @@ void OnApplyTemplateFinished(object? sender, EventArgs e)
 				UpdateAppearance(_shellAppearanceElement);
 		}
 	}
-}
+}

src/Controls/tests/TestCases.HostApp/Issues/Issue34930.cs

@@ -0,0 +1,103 @@
+namespace Maui.Controls.Sample.Issues;
+
+[Issue(IssueTracker.Github, 34930, "SearchHandler.ShowSoftInputAsync() does not focus the SearchHandler", PlatformAffected.UWP)]
+public class Issue34930 : Shell
+{
+	public Issue34930()
+	{
+		var flyoutItem = new FlyoutItem
+		{
+			Route = "home",
+			FlyoutDisplayOptions = FlyoutDisplayOptions.AsSingleItem
+		};
+
+		flyoutItem.Items.Add(new Tab
+		{
+			Title = "Home",
+			Route = "hometab",
+			Items =
+			{
+				new ShellContent
+				{
+					Title = "Home",
+					Route = "homepage",
+					ContentTemplate = new DataTemplate(typeof(_34930TestPage))
+				}
+			}
+		});
+
+		Items.Add(flyoutItem);
+	}
+
+	public class _34930TestPage : ContentPage
+	{
+		public _34930TestPage()
+		{
+			Title = "Home";
+
+			var isFocusedLabel = new Label
+			{
+				Text = "IsFocused: False",
+				AutomationId = "isFocusedLabel"
+			};
+
+			var focusedEventLabel = new Label
+			{
+				Text = "FocusedEvent: False",
+				AutomationId = "focusedEventLabel"
+			};
+
+			var searchHandler = new SearchHandler
+			{
+				AutomationId = "searchHandler",
+				Placeholder = "Search...",
+				SearchBoxVisibility = SearchBoxVisibility.Expanded,
+				ShowsResults = false
+			};
+
+			searchHandler.Focused += (s, e) =>
+			{
+				focusedEventLabel.Text = "FocusedEvent: True";
+			};
+
+			var showKeyboardButton = new Button
+			{
+				Text = "Show Soft Input",
+				AutomationId = "ShowKeyboardButton"
+			};
+
+			showKeyboardButton.Clicked += async (s, e) =>
+			{
+				searchHandler.ShowSoftInputAsync();
+				await Task.Delay(200);
+				isFocusedLabel.Text = $"IsFocused: {searchHandler.IsFocused}";
+			};
+
+			var hideKeyboardButton = new Button
+			{
+				Text = "Hide Soft Input",
+				AutomationId = "HideKeyboardButton"
+			};
+
+			hideKeyboardButton.Clicked += (s, e) =>
+			{
+				searchHandler.HideSoftInputAsync();
+			};
+
+			Shell.SetSearchHandler(this, searchHandler);
+
+			Content = new VerticalStackLayout
+			{
+				Spacing = 15,
+				Padding = 20,
+				Children =
+				{
+					showKeyboardButton,
+					hideKeyboardButton,
+					isFocusedLabel,
+					focusedEventLabel
+				}
+			};
+		}
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue34930.cs

@@ -0,0 +1,29 @@
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues
+{
+	public class Issue34930 : _IssuesUITest
+	{
+		public override string Issue => "SearchHandler.ShowSoftInputAsync() does not focus the SearchHandler on Windows";
+
+		public Issue34930(TestDevice testDevice) : base(testDevice)
+		{
+		}
+
+		[Test]
+		[Category(UITestCategories.SearchBar)]
+		public void SearchHandlerShowSoftInputShouldFocusSearchHandlerOnWindows()
+		{
+			App.WaitForElement("ShowKeyboardButton");
+			App.Tap("ShowKeyboardButton");
+
+			var isFocused = App.WaitForElement("isFocusedLabel").GetText();
+			Assert.That(isFocused, Is.EqualTo("IsFocused: True"));
+
+			var focusedEvent = App.WaitForElement("focusedEventLabel").GetText();
+			Assert.That(focusedEvent, Is.EqualTo("FocusedEvent: True"));
+		}
+	}
+}