[Android/iOS] Fix IsEnabled=False on CollectionView not working

src/Controls/src/Core/Handlers/Items/ItemsViewHandler.cs

@@ -28,7 +28,10 @@ public ItemsViewHandler(PropertyMapper mapper = null) : base(mapper ?? ItemsView
 			[Controls.ItemsView.EmptyViewTemplateProperty.PropertyName] = MapEmptyViewTemplate,
 			[Controls.ItemsView.FlowDirectionProperty.PropertyName] = MapFlowDirection,
 			[Controls.ItemsView.IsVisibleProperty.PropertyName] = MapIsVisible,
-			[Controls.ItemsView.ItemsUpdatingScrollModeProperty.PropertyName] = MapItemsUpdatingScrollMode
+			[Controls.ItemsView.ItemsUpdatingScrollModeProperty.PropertyName] = MapItemsUpdatingScrollMode,
+			#if IOS
+			[nameof(IView.IsEnabled)] = MapIsEnabled,
+			#endif
 		};
 	}
 }

src/Controls/src/Core/Handlers/Items/ItemsViewHandler.iOS.cs

@@ -97,6 +97,11 @@ protected virtual void UpdateLayout()
 			Controller?.UpdateLayout(_layout);
 		}
 
+		internal static void MapIsEnabled(ItemsViewHandler<TItemsView> handler, ItemsView itemsView)
+		{
+			(handler.Controller as SelectableItemsViewController<ReorderableItemsView>)?.UpdateSelectionMode();
+		}
+
 		protected virtual void ScrollToRequested(object sender, ScrollToRequestEventArgs args)
 		{
 			using (var indexPath = DetermineIndex(args))

src/Controls/src/Core/Handlers/Items/iOS/SelectableItemsViewController.cs

@@ -25,7 +25,7 @@ protected override UICollectionViewDelegateFlowLayout CreateDelegator()
 		// _Only_ called if the user initiates the selection change; will not be called for programmatic selection
 		public override void ItemSelected(UICollectionView collectionView, NSIndexPath indexPath)
 		{
-			if (ItemsView?.ItemsSource is null)
+			if (ItemsView?.ItemsSource is null || !ItemsView.IsExplicitlyEnabled)
 			{
 				return;
 			}
@@ -35,7 +35,7 @@ public override void ItemSelected(UICollectionView collectionView, NSIndexPath i
 		// _Only_ called if the user initiates the selection change; will not be called for programmatic selection
 		public override void ItemDeselected(UICollectionView collectionView, NSIndexPath indexPath)
 		{
-			if (ItemsView?.ItemsSource is null)
+			if (ItemsView?.ItemsSource is null || !ItemsView.IsExplicitlyEnabled)
 			{
 				return;
 			}
@@ -185,6 +185,7 @@ internal void UpdatePlatformSelection()
 		internal void UpdateSelectionMode()
 		{
 			var mode = ItemsView.SelectionMode;
+			var isEnabled = ItemsView.IsExplicitlyEnabled;
 
 			switch (mode)
 			{
@@ -194,13 +195,13 @@ internal void UpdateSelectionMode()
 					ClearsSelectionOnViewWillAppear = true;
 					break;
 				case SelectionMode.Single:
-					CollectionView.AllowsSelection = true;
+					CollectionView.AllowsSelection = isEnabled;
 					CollectionView.AllowsMultipleSelection = false;
 					ClearsSelectionOnViewWillAppear = false;
 					break;
 				case SelectionMode.Multiple:
-					CollectionView.AllowsSelection = true;
-					CollectionView.AllowsMultipleSelection = true;
+					CollectionView.AllowsSelection = isEnabled;
+					CollectionView.AllowsMultipleSelection = isEnabled;
 					ClearsSelectionOnViewWillAppear = false;
 					break;
 			}

src/Controls/src/Core/Handlers/Items2/ItemsViewHandler2.iOS.cs

@@ -33,7 +33,8 @@ public ItemsViewHandler2(PropertyMapper mapper = null) : base(mapper ?? ItemsVie
 			[Controls.ItemsView.EmptyViewTemplateProperty.PropertyName] = MapEmptyViewTemplate,
 			[Controls.ItemsView.FlowDirectionProperty.PropertyName] = MapFlowDirection,
 			[Controls.ItemsView.IsVisibleProperty.PropertyName] = MapIsVisible,
-			[Controls.ItemsView.ItemsUpdatingScrollModeProperty.PropertyName] = MapItemsUpdatingScrollMode
+			[Controls.ItemsView.ItemsUpdatingScrollModeProperty.PropertyName] = MapItemsUpdatingScrollMode,
+			[nameof(IView.IsEnabled)] = MapIsEnabled
 		};
 
 		UICollectionViewLayout _layout;
@@ -121,6 +122,11 @@ public static void MapIsVisible(ItemsViewHandler2<TItemsView> handler, ItemsView
 			handler.Controller?.UpdateVisibility();
 		}
 
+		internal static void MapIsEnabled(ItemsViewHandler2<TItemsView> handler, ItemsView itemsView)
+		{
+			(handler.Controller as SelectableItemsViewController2<ReorderableItemsView>)?.UpdateSelectionMode();
+		}
+
 		public static void MapItemsUpdatingScrollMode(ItemsViewHandler2<TItemsView> handler, ItemsView itemsView)
 		{
 			if (handler.ItemsView is StructuredItemsView structuredItemsView && structuredItemsView.ItemsLayout is ItemsLayout itemsLayout)

src/Controls/src/Core/Handlers/Items2/iOS/SelectableItemsViewController2.cs

@@ -26,7 +26,7 @@ protected override UICollectionViewDelegateFlowLayout CreateDelegator()
 		// _Only_ called if the user initiates the selection change; will not be called for programmatic selection
 		public override void ItemSelected(UICollectionView collectionView, NSIndexPath indexPath)
 		{
-			if (ItemsView?.ItemsSource is null)
+			if (ItemsView?.ItemsSource is null || !ItemsView.IsExplicitlyEnabled)
 			{
 				return;
 			}
@@ -36,7 +36,7 @@ public override void ItemSelected(UICollectionView collectionView, NSIndexPath i
 		// _Only_ called if the user initiates the selection change; will not be called for programmatic selection
 		public override void ItemDeselected(UICollectionView collectionView, NSIndexPath indexPath)
 		{
-			if (ItemsView?.ItemsSource is null)
+			if (ItemsView?.ItemsSource is null || !ItemsView.IsExplicitlyEnabled)
 			{
 				return;
 			}
@@ -186,6 +186,7 @@ internal void UpdatePlatformSelection()
 		internal void UpdateSelectionMode()
 		{
 			var mode = ItemsView.SelectionMode;
+			var isEnabled = ItemsView.IsExplicitlyEnabled;
 
 			switch (mode)
 			{
@@ -195,13 +196,13 @@ internal void UpdateSelectionMode()
 					ClearsSelectionOnViewWillAppear = true;
 					break;
 				case SelectionMode.Single:
-					CollectionView.AllowsSelection = true;
+					CollectionView.AllowsSelection = isEnabled;
 					CollectionView.AllowsMultipleSelection = false;
 					ClearsSelectionOnViewWillAppear = false;
 					break;
 				case SelectionMode.Multiple:
-					CollectionView.AllowsSelection = true;
-					CollectionView.AllowsMultipleSelection = true;
+					CollectionView.AllowsSelection = isEnabled;
+					CollectionView.AllowsMultipleSelection = isEnabled;
 					ClearsSelectionOnViewWillAppear = false;
 					break;
 			}

src/Controls/tests/TestCases.HostApp/Issues/Issue20274.xaml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             x:Class="Maui.Controls.Sample.Issues.Issue20274"
+             xmlns:local="clr-namespace:Maui.Controls.Sample.Issues">
+
+    <Grid RowDefinitions="auto,auto, *"> 
+        <Button Text="Change State" AutomationId="Button" Clicked="Button_Clicked"/>
+        <Label Grid.Row="1" AutomationId="Label" HeightRequest="50" VerticalTextAlignment="Center" x:Name="label"/>
+        <CollectionView 
+                            Grid.Row="2" IsEnabled="False"
+                SelectionMode="Single" x:Name="collectionView" SelectionChanged="collectionView_SelectionChanged"
+                ItemsSource="{Binding Items}">
+          <CollectionView.ItemTemplate>
+            <DataTemplate>
+              <Label Margin="10"
+                  Padding="10"
+                              AutomationId="ItemsLabel"
+                  VerticalTextAlignment="Center"
+                  HorizontalTextAlignment="Start"
+                  Text="{Binding Name}" />
+            </DataTemplate>
+          </CollectionView.ItemTemplate>
+        </CollectionView>
+	</Grid>
+
+</ContentPage>

src/Controls/tests/TestCases.HostApp/Issues/Issue20274.xaml.cs

@@ -0,0 +1,61 @@
+using System.Collections.ObjectModel;
+using System.ComponentModel;
+
+namespace Maui.Controls.Sample.Issues
+{
+	[Issue(IssueTracker.Github, 20274, "IsEnabled=False on CollectionView not working", PlatformAffected.All)]
+	public partial class Issue20274 : ContentPage
+	{
+		public ObservableCollection<CollectionViewItem> Items { get; set; }
+
+		public Issue20274()
+		{
+			Items = new ObservableCollection<CollectionViewItem>
+			{
+				new CollectionViewItem { Name = "Item 1" },
+				new CollectionViewItem { Name = "Item 2" },
+				new CollectionViewItem { Name = "Item 3" }
+			};
+			InitializeComponent();
+			BindingContext = this;
+			label.Text = Items[0].Name;
+		}
+
+		void collectionView_SelectionChanged(object sender, SelectionChangedEventArgs e)
+		{
+			if (e.CurrentSelection?.FirstOrDefault() is CollectionViewItem selectedItem)
+			{
+				selectedItem.Name = $"{selectedItem.Name} - Selected";
+				this.label.Text = selectedItem.Name;
+			}
+		}
+
+		void Button_Clicked(object sender, EventArgs e)
+		{
+			collectionView.IsEnabled = !collectionView.IsEnabled;
+		}
+	}
+
+	public class CollectionViewItem : INotifyPropertyChanged
+	{
+		string _name;
+		public string Name
+		{
+			get => _name;
+			set
+			{
+				if (_name != value)
+				{
+					_name = value;
+					OnPropertyChanged(nameof(Name));
+				}
+			}
+		}
+
+		public event PropertyChangedEventHandler PropertyChanged;
+		protected void OnPropertyChanged(string propertyName)
+		{
+			PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+		}
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue20274.cs

@@ -0,0 +1,33 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues
+{
+	public class Issue20274 : _IssuesUITest
+	{
+		public override string Issue => "IsEnabled=False on CollectionView not working";
+
+		public Issue20274(TestDevice device) : base(device)
+		{
+		}
+
+
+		[Test]
+		[Category(UITestCategories.CollectionView)]
+		public void VerifyCollectionViewIsEnableState()
+		{
+			App.WaitForElement("Button");
+			App.Tap("ItemsLabel");
+			Assert.That(App.FindElement("Label").GetText(), Is.EqualTo("Item 1"));
+			App.Tap("Button");
+			App.Tap("ItemsLabel");
+			Assert.That(App.FindElement("Label").GetText(), Is.EqualTo("Item 1 - Selected"));
+		}
+	}
+}