RefreshContainer - show refresh indicator when refresh is triggered programmatically

samples/ControlCatalog/Pages/RefreshContainerPage.axaml

@@ -27,6 +27,7 @@
             </generic:List>
           </ComboBox.ItemsSource>
         </ComboBox>
+        <Button Content="Refresh" Name="RefreshButton"/>
       </StackPanel>
     </StackPanel>
     <RefreshContainer Name="Refresh"

samples/ControlCatalog/Pages/RefreshContainerPage.axaml.cs

@@ -11,11 +11,18 @@ public RefreshContainerPage()
         {
             InitializeComponent();
 
+            RefreshButton.Click += RefreshButton_Click;
+
             _viewModel = new RefreshContainerViewModel();
 
             DataContext = _viewModel;
         }
 
+        private void RefreshButton_Click(object? sender, Avalonia.Interactivity.RoutedEventArgs e)
+        {
+            Refresh.RequestRefresh();
+        }
+
         private async void RefreshContainerPage_RefreshRequested(object? sender, RefreshRequestedEventArgs e)
         {
             var deferral = e.GetDeferral();

samples/ControlCatalog/ViewModels/RefreshContainerViewModel.cs

@@ -1,8 +1,6 @@
 using System.Collections.ObjectModel;
 using System.Linq;
 using System.Threading.Tasks;
-using Avalonia.Controls.Notifications;
-using ControlCatalog.Pages;
 using MiniMvvm;
 
 namespace ControlCatalog.ViewModels

src/Avalonia.Controls/PullToRefresh/RefreshVisualizer.cs

@@ -312,6 +312,7 @@ private void CalculateAndSetOffsets(Grid root, CompositionVisual visual, Composi
         /// </summary>
         public void RequestRefresh()
         {
+            RefreshInfoProvider?.InteractionRatio = 1;
             RefreshVisualizerState = RefreshVisualizerState.Refreshing;
             RefreshInfoProvider?.OnRefreshStarted();
 
@@ -320,8 +321,8 @@ public void RequestRefresh()
 
         private void RefreshCompleted()
         {
+            RefreshInfoProvider?.InteractionRatio = 0;
             RefreshVisualizerState = RefreshVisualizerState.Idle;
-
             RefreshInfoProvider?.OnRefreshCompleted();
         }
 

tests/Avalonia.Controls.UnitTests/PullToRefresh/RefreshVisualizerTests.cs

@@ -0,0 +1,36 @@
+using Avalonia.Controls.PullToRefresh;
+using Avalonia.Input;
+using Avalonia.UnitTests;
+using Xunit;
+
+namespace Avalonia.Controls.UnitTests.PullToRefresh
+{
+    public class RefreshVisualizerTests : ScopedTestBase
+    {
+        [Fact]
+        public void InteractionRatio_Is_One_While_Refreshing_And_Zero_After_Completion()
+        {
+            var provider = new RefreshInfoProvider(
+                PullDirection.TopToBottom,
+                new Size(100, 100),
+                visual: null);
+
+            var visualizer = new RefreshVisualizer();
+            visualizer.RefreshInfoProvider = provider;
+
+            var sawDuringRefresh = false;
+
+            visualizer.RefreshRequested += (s, e) =>
+            {
+                Assert.Equal(1d, provider.InteractionRatio);
+                sawDuringRefresh = true;
+            };
+
+            visualizer.RequestRefresh();
+
+            Assert.True(sawDuringRefresh, "RefreshRequested event should have been raised");
+
+            Assert.Equal(0d, provider.InteractionRatio);
+        }
+    }
+}