From 228d2534866ee6d6d8b002f2476edb2982202eb2 Mon Sep 17 00:00:00 2001
From: lindexi <lindexi_gd@163.com>
Date: Fri, 24 Nov 2023 16:31:00 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BF=AE=E5=A4=8D=E6=B6=88=E6=81=AF=E6=B2=A1?=
 =?UTF-8?q?=E6=9C=89=E6=BB=9A=E5=8A=A8?=
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---
 .../IpcUno/Presentation/ChatPage.xaml.cs      | 25 +++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/demo/UnoDemo/IpcUno/IpcUno/Presentation/ChatPage.xaml.cs b/demo/UnoDemo/IpcUno/IpcUno/Presentation/ChatPage.xaml.cs
index 7cc15b6..be4e0ad 100644
--- 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; }