优化消息处理与界面翻译

在 `ChatDataModel.cs` 中添加了控件引用并重命名消息类型属性。
在 `TrayIconManager.cs` 中将菜单项文本翻译为中文并注释掉部分代码。
调整 `LoginWindow.xaml` 的窗口尺寸。
在 `MainWindow.xaml` 中添加了 `x:Name` 属性和数据触发器，改善了用户体验。
在 `MainWindow.xaml.cs` 中添加了用户登录时的欢迎消息逻辑，并统一了消息类型属性名称。

chatclient/Data/ChatDataModel.cs

@@ -6,6 +6,8 @@ using System.Threading.Tasks;
 using System.Windows.Media;
 using System.Windows;
 using System.Windows.Media.Imaging;
+using System.Windows.Controls;
+using System.Windows.Input;
 
 namespace chatclient.Data
 {
@@ -21,7 +23,7 @@ namespace chatclient.Data
         /// <summary>
         /// 消息类型（文本、图片、文件、系统消息等）
         /// </summary>
-        public required MessageType Type { get; set; } = MessageType.Text;
+        public required MessageType MsgType { get; set; } = MessageType.Text;
         /// <summary>
         /// 消息发送者的头像图片
         /// </summary>

chatclient/Data/TrayIconManager.cs

@@ -51,13 +51,13 @@ namespace chatclient.Data
             };
 
             // 添加菜单项
-            contextMenu.Items.Add(CreateMenuItem("Open Application", PackIconKind.WindowRestore, OpenApp_Click));
+            contextMenu.Items.Add(CreateMenuItem("打开程序", PackIconKind.WindowRestore, OpenApp_Click));
-            contextMenu.Items.Add(CreateMenuItem("Settings", PackIconKind.Cog, Settings_Click));
+            contextMenu.Items.Add(CreateMenuItem("设置", PackIconKind.Cog, Settings_Click));
             contextMenu.Items.Add(new Separator { Style = (Style)Application.Current.Resources["MaterialDesignLightSeparator"] });
-            contextMenu.Items.Add(CreateMenuItem("Check for Updates", PackIconKind.Update, Updates_Click));
+            //contextMenu.Items.Add(CreateMenuItem("Check for Updates", PackIconKind.Update, Updates_Click));
-            contextMenu.Items.Add(CreateMenuItem("Help", PackIconKind.HelpCircle, Help_Click));
+            //contextMenu.Items.Add(CreateMenuItem("Help", PackIconKind.HelpCircle, Help_Click));
-            contextMenu.Items.Add(new Separator { Style = (Style)Application.Current.Resources["MaterialDesignLightSeparator"] });
+            //contextMenu.Items.Add(new Separator { Style = (Style)Application.Current.Resources["MaterialDesignLightSeparator"] });
-            contextMenu.Items.Add(CreateMenuItem("Exit", PackIconKind.Power, Exit_Click));
+            contextMenu.Items.Add(CreateMenuItem("退出", PackIconKind.Power, Exit_Click));
 
             return contextMenu;
         }
@@ -109,7 +109,6 @@ namespace chatclient.Data
 
         private void Exit_Click(object sender, RoutedEventArgs e)
         {
-            // 释放托盘图标资源
             Dispose();
             Application.Current.Shutdown();
         }

chatclient/LoginWindow.xaml

@@ -7,7 +7,7 @@
         xmlns:local="clr-namespace:chatclient"
         xmlns:mah="http://metro.mahapps.com/winfx/xaml/controls" x:Class="chatclient.LoginWindow"
         mc:Ignorable="d"
-        Title="LoginWindow" Height="590" Width="360" MinHeight="590" MinWidth="360" MaxHeight="590" MaxWidth="360" 
+        Title="LoginWindow" Height="590" Width="330" MinHeight="590" MinWidth="330" MaxHeight="590" MaxWidth="330" 
         ResizeMode="NoResize" Closing="Window_Closing">
 
     <TabControl>

chatclient/MainWindow.xaml

@@ -80,9 +80,9 @@
                                                 <!-- 消息卡片（始终在中间列） -->
                                                 <materialDesign:Card Grid.Column="1" Padding="10" HorizontalAlignment="{Binding Alignment}">
                                                     <StackPanel>
-                                                        <TextBlock Text="{Binding Sender}"  FontWeight="Bold" Foreground="{Binding SenderColor}"/>
+                                                        <TextBlock Text="{Binding Sender}" x:Name="Sender" FontWeight="Bold" Foreground="{Binding SenderColor}"/>
-                                                        <TextBlock Text="{Binding Content}"  TextWrapping="Wrap" Margin="0,5,0,0"/>
+                                                        <TextBlock Text="{Binding Content}" TextWrapping="Wrap" Margin="0,5,0,0"/>
-                                                        <TextBlock Text="{Binding Timestamp, StringFormat='HH:mm:ss'}" Foreground="Gray"  FontSize="10" HorizontalAlignment="Right"  Margin="0,5,0,0"/>
+                                                        <TextBlock Text="{Binding Timestamp, StringFormat='HH:mm:ss'}" x:Name="Timestamp" Foreground="Gray"  FontSize="10" HorizontalAlignment="Right"  Margin="0,5,0,0"/>
                                                     </StackPanel>
                                                 </materialDesign:Card>
                                                 <!-- 右侧头像（仅当Alignment=Right时显示） -->
@@ -96,6 +96,12 @@
                                             </Grid>
                                             <!-- 根据Alignment显示正确的头像 -->
                                             <DataTemplate.Triggers>
+                                                <DataTrigger Binding="{Binding MsgType}" Value="3">
+                                                    <Setter TargetName="Sender" Property="Visibility" Value="Collapsed"/>
+                                                    <Setter TargetName="Timestamp" Property="Visibility" Value="Collapsed"/>
+                                                    <Setter TargetName="leftAvatar" Property="Visibility" Value="Collapsed"/>
+                                                    <Setter TargetName="rightAvatar" Property="Visibility" Value="Collapsed"/>
+                                                </DataTrigger>
                                                 <!-- 左对齐消息：显示左侧头像 -->
                                                 <DataTrigger Binding="{Binding Alignment}" Value="Left">
                                                     <Setter TargetName="leftAvatar" Property="Visibility" Value="Visible"/>
@@ -119,7 +125,7 @@
                                         <RowDefinition Height="Auto"/>
                                     </Grid.RowDefinitions>
                                     <TextBox x:Name="txtMessage" Grid.Row="0" materialDesign:HintAssist.Hint="输入消息..." AcceptsReturn="True" VerticalScrollBarVisibility="Auto"
-                                             TextWrapping="Wrap" MinHeight="50" MaxHeight="100" Margin="5" BorderBrush="#00000000"/>
+                                             TextWrapping="Wrap" MinHeight="50" MaxHeight="100" Margin="5" BorderBrush="#00000000" CaretBrush="#00673AB7" SelectionBrush="#00B39DDB"/>
                                     <Button x:Name="btnSend" Grid.Row="1" Content="发送" MinWidth="80" Style="{StaticResource MaterialDesignRaisedButton}"
                                             Click="SendMessage_Click" Width="20" HorizontalAlignment="Right" Margin="2,2,4,4"/>
                                 </Grid>

chatclient/MainWindow.xaml.cs

@@ -149,6 +149,17 @@ namespace chatclient
                                     var loginWindow = Application.Current.Windows.OfType<LoginWindow>().FirstOrDefault();
                                     loginWindow?.Close();
                                     mainWindow.Activate();
+                                    var chatmessage = new ChatMessage
+                                    {
+                                        Sender = "System",
+                                        MsgType = MessageType.System,
+                                        Image = new BitmapImage(new Uri("pack://application:,,,/resource/user.png")),
+                                        Content = $"你好 {UserName} !",
+                                        Timestamp = DateTime.Now,
+                                        Alignment = HorizontalAlignment.Center,
+                                        SenderColor = new SolidColorBrush(Colors.Gray)
+                                    };
+                                    mainWindow?.Messages.Add(chatmessage);
                                 }
                             });
                             log.Info($"用户 {UserName} 登录成功(token:{token})");
@@ -190,7 +201,7 @@ namespace chatclient
                                     var chatmessage = new ChatMessage
                                     {
                                         Sender = chat.user ?? "未知用户",
-                                        Type = MessageType.Text,
+                                        MsgType = MessageType.Text,
                                         Image = new BitmapImage(new Uri(chat.image ?? "pack://application:,,,/resource/user.png", UriKind.Absolute)),
                                         Content = chat.message ?? "(无内容)",
                                         Timestamp = DateTime.Now,
@@ -205,7 +216,7 @@ namespace chatclient
                                     var chatmessage = new ChatMessage
                                     {
                                         Sender = chat.user ?? "未知用户",
-                                        Type = MessageType.Text,
+                                        MsgType = MessageType.Text,
                                         Image = new BitmapImage(new Uri(chat.image ?? "pack://application:,,,/resource/user.png", UriKind.Absolute)),
                                         Content = chat.message ?? "(无内容)",
                                         Timestamp = chat.timestamp,
@@ -215,7 +226,6 @@ namespace chatclient
                                     var mainWindow = Application.Current.Windows.OfType<MainWindow>().FirstOrDefault();
                                     mainWindow?.Messages.Add(chatmessage);
                                 }
-                                
                             });
                         }
                         else