[Windows] Fix CarouselView EmptyView display when filtering to zero items

src/Controls/src/Core/Handlers/Items/CarouselViewHandler.Windows.cs

@@ -149,7 +149,7 @@ protected override ItemsViewScrolledEventArgs ComputeVisibleIndexes(ItemsViewScr
 		{
 			args = base.ComputeVisibleIndexes(args, orientation, advancing);
 
-			if (ItemsView.Loop && ItemsView.ItemsSource is not null)
+			if (ItemsView.Loop && ItemsView.ItemsSource is not null && ItemCount > 0)
 			{
 				args.FirstVisibleItemIndex %= ItemCount;
 				args.CenterItemIndex %= ItemCount;
@@ -159,6 +159,21 @@ protected override ItemsViewScrolledEventArgs ComputeVisibleIndexes(ItemsViewScr
 			return args;
 		}
 
+		protected override void UpdateEmptyViewVisibility()
+		{
+			if (ItemsView?.Loop == true)
+			{
+				bool isEmpty = (CollectionViewSource?.View?.Count ?? 0) == 0;
+				var targetTemplate = isEmpty ? null : CarouselItemsViewTemplate;
+				if (ListViewBase.ItemTemplate != targetTemplate)
+				{
+					ListViewBase.ItemTemplate = targetTemplate;
+				}
+			}
+
+			base.UpdateEmptyViewVisibility();
+		}
+
 		ListViewBase CreateCarouselListLayout(ItemsLayoutOrientation layoutOrientation)
 		{
 			UI.Xaml.Controls.ListView listView;

src/Controls/src/Core/PublicAPI/net-windows/PublicAPI.Unshipped.txt

@@ -4,5 +4,6 @@ override Microsoft.Maui.Controls.Shapes.Shape.OnPropertyChanged(string? property
 ~override Microsoft.Maui.Controls.RadioButton.OnPropertyChanged(string propertyName = null) -> void
 override Microsoft.Maui.Controls.GraphicsView.OnBindingContextChanged() -> void
 override Microsoft.Maui.Controls.TitleBar.OnBindingContextChanged() -> void
+override Microsoft.Maui.Controls.Handlers.Items.CarouselViewHandler.UpdateEmptyViewVisibility() -> void
 ~override Microsoft.Maui.Controls.SwipeItems.OnPropertyChanged(string propertyName = null) -> void
 Microsoft.Maui.Controls.Label.~Label() -> void

src/Controls/tests/TestCases.HostApp/Issues/Issue7150.cs

@@ -0,0 +1,148 @@
+using System;
+using System.Collections.ObjectModel;
+using System.Windows.Input;
+
+namespace Maui.Controls.Sample.Issues;
+[Issue(IssueTracker.Github, 7150, "EmptyView using Template displayed at the same time as the content", PlatformAffected.UWP)]
+public class Issue7150 : TestContentPage
+{
+	public Issue7150()
+	{
+		Title = "Issue 7150";
+		BindingContext = new Issue7150ViewModel();
+	}
+	protected override void Init()
+	{
+		var filterButton = new Button
+		{
+			Margin = new Thickness(20),
+			AutomationId = "FilterButton",
+			Text = "Filter"
+		};
+		filterButton.SetBinding(Button.CommandProperty, "FilterCommand");
+
+		var emptyViewContent = new StackLayout
+		{
+			HorizontalOptions = LayoutOptions.Center,
+			VerticalOptions = LayoutOptions.Start,
+			Children =
+				{
+					new Label
+					{
+						Text = "No results matched your filter.",
+						Margin = new Thickness(10, 25, 10, 10),
+						FontAttributes = FontAttributes.Bold,
+						FontSize = 18,
+						HorizontalTextAlignment = TextAlignment.Center
+					},
+					new Label
+					{
+						Text = "Try a broader filter?",
+						FontAttributes = FontAttributes.Italic,
+						FontSize = 12,
+						HorizontalTextAlignment = TextAlignment.Center
+					}
+				}
+		};
+
+		var emptyView = new ContentView { Content = emptyViewContent };
+		var carouselView = new CarouselView
+		{
+			ItemTemplate = GetCarouselTemplate(),
+			EmptyView = emptyView,
+		};
+
+		carouselView.SetBinding(ItemsView.ItemsSourceProperty, "Items");
+		var grid = new Grid
+		{
+			RowDefinitions = new RowDefinitionCollection
+			{
+				new RowDefinition { Height = GridLength.Auto },
+				new RowDefinition { Height = GridLength.Star }
+			}
+		};
+
+		grid.Add(filterButton, 0, 0);
+		grid.Add(carouselView, 0, 1);
+		Content = grid;
+	}
+
+	internal DataTemplate GetCarouselTemplate()
+	{
+		return new DataTemplate(() =>
+		{
+			var grid = new Grid();
+			var info = new Label
+			{
+				HorizontalOptions = LayoutOptions.Center,
+				VerticalOptions = LayoutOptions.Center,
+				Margin = new Thickness(6)
+			};
+
+			info.SetBinding(Label.TextProperty, new Binding("Name"));
+			grid.Children.Add(info);
+			return grid;
+		});
+	}
+
+	public class Issue7150Model
+	{
+		public string Name { get; set; }
+	}
+
+	public class Issue7150ViewModel : BindableObject
+	{
+		ObservableCollection<Issue7150Model> _items;
+		public ICommand FilterCommand => new Command(FilterItems);
+		readonly IList<Issue7150Model> source;
+
+		public Issue7150ViewModel()
+		{
+			source = new List<Issue7150Model>();
+			source.Add(new Issue7150Model
+			{
+				Name = "Baboon"
+			});
+			source.Add(new Issue7150Model
+			{
+				Name = "Capuchin Monkey"
+			});
+			source.Add(new Issue7150Model
+			{
+				Name = "Blue Monkey"
+			});
+
+			Items = new ObservableCollection<Issue7150Model>(source);
+		}
+
+		public ObservableCollection<Issue7150Model> Items
+		{
+			get { return _items; }
+			set
+			{
+				_items = value;
+				OnPropertyChanged();
+			}
+		}
+
+		public void FilterItems()
+		{
+			var filter = "Mandrill";
+			var filteredItems = source.Where(monkey => monkey.Name?.Contains(filter, StringComparison.OrdinalIgnoreCase) ?? false).ToList();
+			foreach (var monkey in source)
+			{
+				if (!filteredItems.Contains(monkey))
+				{
+					Items?.Remove(monkey);
+				}
+				else
+				{
+					if (Items != null && !Items.Contains(monkey))
+					{
+						Items.Add(monkey);
+					}
+				}
+			}
+		}
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue7150.cs

@@ -0,0 +1,22 @@
+#if TEST_FAILS_ON_WINDOWS // Related issue for windows: https://github.com/dotnet/maui/issues/29245 
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues;
+public class Issue7150 : _IssuesUITest
+{
+    public Issue7150(TestDevice device) : base(device) { }
+
+    public override string Issue => "EmptyView using Template displayed at the same time as the content";
+
+    [Test]
+    [Category(UITestCategories.CarouselView)]
+    public void VerifyCarouselViewEmptyView()
+    {
+        App.WaitForElement("FilterButton");
+        App.Tap("FilterButton");
+        VerifyScreenshot();
+    }
+}
+#endif