Enable Expander on ListView + Enable Expander CollectionView GridLayout 1557

samples/CommunityToolkit.Maui.Sample/Pages/Views/Expander/ExpanderPage.xaml

@@ -74,7 +74,7 @@
                 </ListView.ItemTemplate>
             </ListView>
 
-            <Label Text="Expander in CollectionView" FontSize="24" FontAttributes="Bold"/>
+            <Label Text="Expander in CollectionView with LinearItemsLayout" FontSize="24" FontAttributes="Bold"/>
 
             <CollectionView ItemsSource="{Binding ContentCreators}">
                 <CollectionView.ItemTemplate>
@@ -96,6 +96,35 @@
                     </DataTemplate>
                 </CollectionView.ItemTemplate>
             </CollectionView>
+
+            <Label Text="Expander in CollectionView with GridItemsLayout" FontSize="24" FontAttributes="Bold"/>
+
+            <CollectionView ItemsSource="{Binding ContentCreators}">
+                <CollectionView.ItemsLayout>
+                    <GridItemsLayout Orientation="Vertical"
+                                     Span="4"
+                                     HorizontalItemSpacing="5"
+                                     VerticalItemSpacing="5" />
+                </CollectionView.ItemsLayout>
+                <CollectionView.ItemTemplate>
+                    <DataTemplate>
+                        <mct:Expander x:DataType="sample:ContentCreator"
+                                      ExpandedChanged="Expander_ExpandedChanged">
+                            <mct:Expander.Header>
+                                <Label Text="{Binding Name}"/>
+                            </mct:Expander.Header>
+                            <mct:Expander.Content>
+                                <VerticalStackLayout>
+                                    <Label Text="{Binding Resource}" HorizontalOptions="Center"/>
+                                    <Image Source="{Binding Image}"
+                                           WidthRequest="100"
+                                           HeightRequest="100"/>
+                                </VerticalStackLayout>
+                            </mct:Expander.Content>
+                        </mct:Expander>
+                    </DataTemplate>
+                </CollectionView.ItemTemplate>
+            </CollectionView>
         </VerticalStackLayout>
     </ScrollView>
 </pages:BasePage>

samples/CommunityToolkit.Maui.Sample/ViewModels/Views/ExpanderViewModel.cs

@@ -20,7 +20,10 @@ public static IEnumerable<ContentCreator> GetContentCreators() =>
 			new("Kym Phillpotts", "https://kymphillpotts.com", "https://avatars.githubusercontent.com/u/1327346"),
 			new("Pedro Jesus", "https://github.com/pictos", "https://avatars.githubusercontent.com/u/20712372"),
 			new("Shaun Lawrence", "https://github.com/bijington", "https://avatars.githubusercontent.com/u/17139988"),
-			new("Vladislav Antonyuk", "https://vladislavantonyuk.azurewebsites.net", "https://avatars.githubusercontent.com/u/33021114"),
+			new("Vladislav Antonyuk", "https://vladislavantonyuk.github.io", "https://avatars.githubusercontent.com/u/33021114"),
+			new("Víctor Hugo García Hernández", "", "https://avatars.githubusercontent.com/u/1047398"),
+			new("James Crutchley", "", "https://avatars.githubusercontent.com/u/4167863"),
+			new("Clifford Agius", "https://cliffordagius.co.uk/", "https://avatars.githubusercontent.com/u/5613809"),
 		];
 	}
 }

src/CommunityToolkit.Maui/Views/Expander/Expander.shared.cs

@@ -169,33 +169,31 @@ void ResizeExpanderInItemsView(TappedEventArgs tappedEventArgs)
 		}
 
 		Element element = this;
+#if WINDOWS
 		var size = IsExpanded
 					? Measure(double.PositiveInfinity, double.PositiveInfinity)
 					: Header.Measure(double.PositiveInfinity, double.PositiveInfinity);
-
+#endif
 		while (element is not null)
 		{
-			if (element.Parent is ListView && element is Cell cell)
-			{
 #if IOS || MACCATALYST
-				throw new NotSupportedException($"{nameof(Expander)} is not yet supported in {nameof(ListView)}");
-#else
-				cell.ForceUpdateSize();
+			if (element is ListView listView)
+			{
+				(listView.Handler?.PlatformView as UIKit.UITableView)?.ReloadData();
+			}
 #endif
+
+#if WINDOWS
+			if (element.Parent is ListView listView && element is Cell cell)
+			{
+				cell.ForceUpdateSize();
 			}
-#if IOS || MACCATALYST || WINDOWS
 			else if (element is CollectionView collectionView)
 			{
 				var tapLocation = tappedEventArgs.GetPosition(collectionView);
 				ForceUpdateCellSize(collectionView, size, tapLocation);
 			}
 #endif
-#if IOS || MACCATALYST
-            else if (element is ScrollView scrollView)
-			{
-			    ((IView)scrollView).InvalidateMeasure();
-			}
-#endif
 
 			element = element.Parent;
 		}

src/CommunityToolkit.Maui/Views/Expander/Expander.windows.cs

@@ -1,4 +1,3 @@
-using CommunityToolkit.Maui.Core.Extensions;
 using Microsoft.Maui.Controls.Platform;
 using Microsoft.UI.Xaml.Controls;
 
@@ -30,5 +29,48 @@ static void ForceUpdateCellSize(CollectionView collectionView, Size size, Point?
 				}
 			}
 		}
+		else if (collectionView.Handler?.PlatformView is FormsGridView gridView)
+		{
+			var numberOfColumns = gridView.Span;
+			if (numberOfColumns == 0)
+			{
+				return;
+			}
+
+			for (var i = 0; i < gridView.Items.Count; i++)
+			{
+				if (gridView.ContainerFromIndex(i) is GridViewItem gridViewItem)
+				{
+					var itemTransform = gridViewItem.TransformToVisual(gridView);
+					var itemPosition = itemTransform.TransformPoint(new Windows.Foundation.Point(0, 0));
+					var itemBounds = new Rect(itemPosition.X, itemPosition.Y, gridViewItem.ActualWidth, gridViewItem.ActualHeight);
+
+					if (itemBounds.Contains(tapLocation.Value))
+					{
+						IterateItemsInRow(gridView, i, numberOfColumns, size.Height);
+						break;
+					}
+				}
+			}
+		}
+	}
+
+	static void IterateItemsInRow(ItemsControl gridView, int itemIndex, int totalColumns, double height)
+	{
+		var rowToIterate = itemIndex / totalColumns;
+		var startIndex = rowToIterate * totalColumns;
+
+		for (var i = startIndex; i < startIndex + totalColumns; i++)
+		{
+			if (i >= gridView.Items.Count)
+			{
+				break;
+			}
+
+			if (gridView.ContainerFromIndex(i) is GridViewItem cell)
+			{
+				cell.Height = height + Random.Shared.NextDouble();
+			}
+		}
 	}
 }