修复消息没有滚动

dotnet-campus · Nov 24, 2023 · 228d253 · 228d253
1 parent 797bb6b
commit 228d253
Showing 1 changed file with 23 additions and 2 deletions.
diff --git a/demo/UnoDemo/IpcUno/IpcUno/Presentation/ChatPage.xaml.cs b/demo/UnoDemo/IpcUno/IpcUno/Presentation/ChatPage.xaml.cs
@@ -1,21 +1,42 @@
 using System.Reflection;
 using System.Text;
 
+using IpcUno.Utils;
+
 namespace IpcUno.Presentation
 {
     public sealed partial class ChatPage : Page
     {
         public ChatPage(ConnectedPeerModel model, string serverName)
         {
-            DataContextChanged += ChatPage_DataContextChanged;
             DataContext = model;
             this.InitializeComponent();
             Model = model;
             ServerName = serverName;
+
+            Loaded += ChatPage_Loaded;
+        }
+
+        private void ChatPage_Loaded(object sender, RoutedEventArgs e)
+        {
+            ScrollToBottom(MessageListView);
+
+            // 有消息过来，自动滚动到最下
+            Model.MessageList.CollectionChanged += (o, args) =>
+            {
+                _ = Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Low, () =>
+                 {
+                     ScrollToBottom(MessageListView);
+                 });
+            };
         }
 
-        private void ChatPage_DataContextChanged(FrameworkElement sender, DataContextChangedEventArgs args)
+        private void ScrollToBottom(ListView listView)
         {
+            if (listView.VisualDescendant<ScrollViewer>() is { } scrollViewer)
+            {
+                scrollViewer.ChangeView(0.0f, scrollViewer.ExtentHeight, 1.0f, true);
+            }
         }
 
         public string ServerName { get; }