History: handle Tapped at ListBox level to copy output for entire row; switch template back to Grid with ContextMenu; stretch item content for full-row target.

src/AdvancedCalculator/Views/MainView.axaml

@@ -71,32 +71,23 @@
 			<Grid RowDefinitions="*,Auto">
 				<!-- History -->
                 <Grid Grid.Row="0">
-                    <ListBox ItemsSource="{Binding History}" SelectedIndex="{Binding SelectedHistoryIndex}"
+                    <ListBox x:Name="HistoryList" ItemsSource="{Binding History}" SelectedIndex="{Binding SelectedHistoryIndex}"
+                             HorizontalContentAlignment="Stretch"
                          AutomationProperties.Name="History list">
                         <ListBox.ItemTemplate>
                             <DataTemplate x:DataType="m:HistoryItem">
-                                <!-- Make the entire row a single Button so the whole item is clickable -->
+                                <!-- Entire row UI; ListBox-level Tapped handler triggers copy -->
-                                <Button x:DataType="vm:MainViewModel"
-                                        DataContext="{Binding #Root.DataContext}"
-                                        Command="{Binding CopyHistoryOutputCommand}"
-                                        CommandParameter="{Binding $parent[ListBoxItem].DataContext}"
-                                        Background="Transparent"
-                                        BorderThickness="0"
-                                        Padding="0"
-                                        MinHeight="40"
-                                        AutomationProperties.Name="Copy history item">
                                 <Grid x:Name="HistoryRow" ColumnDefinitions="Auto,*,Auto" Margin="4,2"
                                       DataContext="{Binding $parent[ListBoxItem].DataContext}"
                                       x:DataType="m:HistoryItem">
                                     <TextBlock Grid.Column="0" FontFamily="{StaticResource MDI}" Text="{x:Static m:IconFont.ArrowRightDropCircle}"
-                                                   FontSize="{DynamicResource IconSizeM}"
+                                               FontSize="{DynamicResource IconSizeM}" VerticalAlignment="Center" Margin="0,0,8,0" />
-                                                   VerticalAlignment="Center" Margin="0,0,8,0" />
                                     <StackPanel Grid.Column="1">
                                         <TextBlock Text="{Binding Input}" MaxLines="3" />
                                         <TextBlock Text="{Binding Output}" FontWeight="Bold" MaxLines="2" />
                                     </StackPanel>
 
-                                        <!-- Context menu for right-click / long-press (Android) -->
+                                    <!-- Context menu for right-click / long-press (touch) -->
                                     <Grid.ContextMenu>
                                         <ContextMenu>
                                             <MenuItem x:DataType="vm:MainViewModel"
@@ -117,7 +108,6 @@
                                         </ContextMenu>
                                     </Grid.ContextMenu>
                                 </Grid>
-                                </Button>
                             </DataTemplate>
                         </ListBox.ItemTemplate>
                     </ListBox>

src/AdvancedCalculator/Views/MainView.axaml.cs

@@ -1,7 +1,11 @@
 using System;
 using Avalonia;
 using Avalonia.Controls;
+using Avalonia.Input;
+using Avalonia.Interactivity;
+using Avalonia.VisualTree;
 using AdvancedCalculator.ViewModels;
+using AdvancedCalculator.Models;
 
 namespace AdvancedCalculator.Views;
 
@@ -15,6 +19,7 @@ public partial class MainView : UserControl
     }
 
     private MainViewModel? _vm;
+    private ListBox? _historyList;
 
     private void OnAttachedToVisualTree(object? sender, VisualTreeAttachmentEventArgs e)
     {
@@ -23,6 +28,14 @@ public partial class MainView : UserControl
         {
             _vm.CopyRequested += OnCopyRequested;
         }
+
+        _historyList = this.FindControl<ListBox>("HistoryList");
+        if (_historyList is not null)
+        {
+            // Handle taps anywhere in a history row to copy output text
+            _historyList.AddHandler(InputElement.TappedEvent, OnHistoryTapped,
+                RoutingStrategies.Tunnel | RoutingStrategies.Bubble);
+        }
     }
 
     private void OnDetachedFromVisualTree(object? sender, VisualTreeAttachmentEventArgs e)
@@ -31,6 +44,11 @@ public partial class MainView : UserControl
         {
             _vm.CopyRequested -= OnCopyRequested;
         }
+        if (_historyList is not null)
+        {
+            _historyList.RemoveHandler(InputElement.TappedEvent, OnHistoryTapped);
+            _historyList = null;
+        }
         _vm = null;
     }
 
@@ -47,4 +65,21 @@ public partial class MainView : UserControl
             // Ignore clipboard errors; e.g., browser permission or missing gesture context
         }
     }
+
+    private void OnHistoryTapped(object? sender, TappedEventArgs e)
+    {
+        // Find the ListBoxItem the tap originated from
+        var source = e.Source as IVisual;
+        var container = source?.FindAncestorOfType<ListBoxItem>();
+        if (container?.DataContext is not HistoryItem item)
+            return;
+
+        var vm = DataContext as MainViewModel;
+        if (vm?.CopyHistoryOutputCommand.CanExecute(item) == true)
+        {
+            vm.CopyHistoryOutputCommand.Execute(item);
+            // Mark handled to avoid unintended selection change on tap
+            e.Handled = true;
+        }
+    }
 }