feat: implement RefreshContainer.

demo/Semi.Avalonia.Demo/Pages/RefreshContainerDemo.axaml

@@ -4,12 +4,24 @@
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    xmlns:pages="clr-namespace:Semi.Avalonia.Demo.Pages"
     d:DesignHeight="450"
     d:DesignWidth="800"
+    x:DataType="pages:RefreshContainerDemoViewModel"
+    x:CompileBindings="True"
     mc:Ignorable="d">
-    <StackPanel HorizontalAlignment="Left" Spacing="20">
-        <RefreshContainer Name="container">
-            <TextBlock Text="Content" />
+    <DockPanel HorizontalAlignment="Stretch" VerticalAlignment="Top">
+        <Label DockPanel.Dock="Top">A control that supports pull to refresh</Label>
+        <RefreshContainer Name="Refresh"
+                          DockPanel.Dock="Bottom"
+                          HorizontalAlignment="Stretch"
+                          VerticalAlignment="Stretch"
+                          PullDirection="TopToBottom"
+                          RefreshRequested="RefreshContainerPage_RefreshRequested"
+                          Margin="5">
+            <ListBox HorizontalAlignment="Stretch"
+                     VerticalAlignment="Top"
+                     ItemsSource="{Binding Items}" />
         </RefreshContainer>
-    </StackPanel>
+    </DockPanel>
 </UserControl>

demo/Semi.Avalonia.Demo/Pages/RefreshContainerDemo.axaml.cs

@@ -1,14 +1,46 @@
-using Avalonia;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Threading.Tasks;
 using Avalonia.Controls;
-using Avalonia.Interactivity;
-using Avalonia.Markup.Xaml;
+using CommunityToolkit.Mvvm.ComponentModel;
 
 namespace Semi.Avalonia.Demo.Pages;
 
 public partial class RefreshContainerDemo : UserControl
 {
+    private RefreshContainerDemoViewModel _viewModel;
+
     public RefreshContainerDemo()
     {
         InitializeComponent();
+
+        _viewModel = new RefreshContainerDemoViewModel();
+
+        DataContext = _viewModel;
+    }
+
+    private async void RefreshContainerPage_RefreshRequested(object? sender, RefreshRequestedEventArgs e)
+    {
+        var deferral = e.GetDeferral();
+
+        await _viewModel.AddToTop();
+
+        deferral.Complete();
+    }
+}
+
+public class RefreshContainerDemoViewModel : ObservableObject
+{
+    public ObservableCollection<string> Items { get; }
+
+    public RefreshContainerDemoViewModel()
+    {
+        Items = new ObservableCollection<string>(Enumerable.Range(1, 200).Select(i => $"Item {i}"));
+    }
+
+    public async Task AddToTop()
+    {
+        await Task.Delay(1000);
+        Items.Insert(0, $"Item {200 - Items.Count}");
     }
 }

src/Semi.Avalonia/Controls/RefreshContainer.axaml

@@ -30,18 +30,19 @@
         <Setter Property="Height" Value="100" />
         <Setter Property="Background" Value="{DynamicResource RefreshContainerIconBackground}" />
         <Setter Property="Foreground" Value="{DynamicResource RefreshContainerIconForeground}" />
+        <Setter Property="Content">
+            <Template>
+                <PathIcon Name="PART_Icon"
+                          Data="{DynamicResource RefreshContainerIconGlyph}"
+                          Width="24"
+                          Height="24" />
+            </Template>
+        </Setter>
         <Setter Property="Template">
             <ControlTemplate>
-                <Grid
-                    Name="PART_Root"
-                    MinHeight="80"
-                    Background="{TemplateBinding Background}">
-                    <Grid.Styles>
-                        <Style Selector="PathIcon#PART_Icon">
-                            <Setter Property="Data" Value="{DynamicResource RefreshContainerIconGlyph}" />
-                        </Style>
-                    </Grid.Styles>
-                </Grid>
+                <Grid Name="PART_Root"
+                      MinHeight="80"
+                      Background="{TemplateBinding Background}" />
             </ControlTemplate>
         </Setter>
     </ControlTheme>