Merge pull request #2 from xujie86/master

Update

v2rayN/ServiceLib/ViewModels/MsgViewModel.cs

@@ -1,5 +1,6 @@
 using System.Collections.Concurrent;
 using System.Reactive.Linq;
+using System.Text;
 using System.Text.RegularExpressions;
 using ReactiveUI;
 using ReactiveUI.Fody.Helpers;
@@ -9,7 +10,7 @@ namespace ServiceLib.ViewModels;
 public class MsgViewModel : MyReactiveObject
 {
     private readonly ConcurrentQueue<string> _queueMsg = new();
-    private readonly int _numMaxMsg = 500;
+    private readonly int _numMaxMsg = 500; // 仅用于限制队列，不做显示裁剪
     private bool _lastMsgFilterNotAvailable;
     private bool _blLockShow = false;
 
@@ -26,63 +27,45 @@ public class MsgViewModel : MyReactiveObject
         MsgFilter = _config.MsgUIItem.MainMsgFilter ?? string.Empty;
         AutoRefresh = _config.MsgUIItem.AutoRefresh ?? true;
 
-        this.WhenAnyValue(
-           x => x.MsgFilter)
-               .Subscribe(c => DoMsgFilter());
-
-        this.WhenAnyValue(
-          x => x.AutoRefresh,
-          y => y == true)
+        this.WhenAnyValue(x => x.MsgFilter).Subscribe(c => DoMsgFilter());
+        this.WhenAnyValue(x => x.AutoRefresh, y => y == true)
             .Subscribe(c => { _config.MsgUIItem.AutoRefresh = AutoRefresh; });
 
         AppEvents.SendMsgViewRequested
             .AsObservable()
-         //.ObserveOn(RxApp.MainThreadScheduler)
             .Subscribe(async content => await AppendQueueMsg(content));
     }
 
     private async Task AppendQueueMsg(string msg)
     {
-        //if (msg == Global.CommandClearMsg)
-        //{
-        //    ClearMsg();
-        //    return;
-        //}
-        if (AutoRefresh == false)
-        {
-            return;
-        }
-        _ = EnqueueQueueMsg(msg);
-
-        if (_blLockShow)
-        {
-            return;
-        }
-        if (!_config.UiItem.ShowInTaskbar)
-        {
-            return;
-        }
+        if (AutoRefresh == false) return;
+        await EnqueueQueueMsg(msg);
 
+        if (_blLockShow || !_config.UiItem.ShowInTaskbar) return;
         _blLockShow = true;
 
         await Task.Delay(500);
-        var txt = string.Join("", _queueMsg.ToArray());
-        await _updateView?.Invoke(EViewAction.DispatcherShowMsg, txt);
+
+        var sbDelta = new StringBuilder();
+        while (_queueMsg.TryDequeue(out var line))
+        {
+            sbDelta.Append(line);
+        }
+
+        var delta = sbDelta.ToString();
+        if (delta.Length > 0)
+            await _updateView?.Invoke(EViewAction.DispatcherShowMsg, delta);
 
         _blLockShow = false;
     }
 
     private async Task EnqueueQueueMsg(string msg)
     {
-        //filter msg
         if (MsgFilter.IsNotEmpty() && !_lastMsgFilterNotAvailable)
         {
             try
             {
-                if (!Regex.IsMatch(msg, MsgFilter))
-                {
-                    return;
-                }
+                if (!Regex.IsMatch(msg, MsgFilter)) return;
             }
             catch (Exception ex)
             {
@@ -91,26 +74,17 @@ public class MsgViewModel : MyReactiveObject
             }
         }
 
-        //Enqueue
-        if (_queueMsg.Count > _numMaxMsg)
-        {
-            for (int k = 0; k < _queueMsg.Count - _numMaxMsg; k++)
-            {
+        while (_queueMsg.Count > _numMaxMsg)
             _queueMsg.TryDequeue(out _);
-            }
-        }
+
         _queueMsg.Enqueue(msg);
         if (!msg.EndsWith(Environment.NewLine))
-        {
             _queueMsg.Enqueue(Environment.NewLine);
-        }
+
         await Task.CompletedTask;
     }
 
-    public void ClearMsg()
-    {
-        _queueMsg.Clear();
-    }
+    public void ClearMsg() => _queueMsg.Clear();
 
     private void DoMsgFilter()
     {

v2rayN/v2rayN.Desktop/Views/MsgView.axaml.cs

@@ -5,12 +5,15 @@ using Avalonia.ReactiveUI;
 using Avalonia.Threading;
 using ReactiveUI;
 using v2rayN.Desktop.Common;
+using System.Text;
 
 namespace v2rayN.Desktop.Views;
 
 public partial class MsgView : ReactiveUserControl<MsgViewModel>
 {
     private readonly ScrollViewer _scrollViewer;
+    private const int _maxLines = 320;   // 实际保留的行数
+    private const int _trimLines = 350;  // 超过此阈值时裁剪
     private int _lastShownLength = 0;
 
     public MsgView()
@@ -32,8 +35,7 @@ public partial class MsgView : ReactiveUserControl<MsgViewModel>
         switch (action)
         {
             case EViewAction.DispatcherShowMsg:
-                if (obj is null)
-                    return false;
+                if (obj is null) return false;
 
                 Dispatcher.UIThread.Post(() =>
                     ShowMsg(obj),
@@ -46,16 +48,20 @@ public partial class MsgView : ReactiveUserControl<MsgViewModel>
     private void ShowMsg(object msg)
     {
         var newText = msg?.ToString() ?? string.Empty;
+        txtMsg.Text += newText;
 
-        if (txtMsg.Text is { } old && newText.Length >= _lastShownLength && newText.AsSpan(0, _lastShownLength).SequenceEqual(old))
+        var lines = txtMsg.Text.Split(Environment.NewLine);
+        if (lines.Length > _trimLines)
         {
-            var delta = newText.AsSpan(_lastShownLength);
-            if (!delta.IsEmpty)
-                txtMsg.Text += delta.ToString();
+            var sb = new StringBuilder();
+            int start = lines.Length - _maxLines;
+            for (int i = start; i < lines.Length; i++)
+            {
+                sb.Append(lines[i]);
+                if (i < lines.Length - 1)
+                    sb.Append(Environment.NewLine);
             }
-        else
-        {
-            txtMsg.Text = newText;
+            txtMsg.Text = sb.ToString();
         }
 
         _lastShownLength = txtMsg.Text.Length;
@@ -70,6 +76,7 @@ public partial class MsgView : ReactiveUserControl<MsgViewModel>
     {
         ViewModel?.ClearMsg();
         txtMsg.Text = "";
+        _lastShownLength = 0;
     }
 
     private void menuMsgViewSelectAll_Click(object? sender, RoutedEventArgs e)

v2rayN/v2rayN/Views/MsgView.xaml.cs

@@ -1,4 +1,5 @@
 using System.Reactive.Disposables;
+using System.Text;
 using System.Windows;
 using System.Windows.Threading;
 using ReactiveUI;
@@ -7,6 +8,9 @@ namespace v2rayN.Views;
 
 public partial class MsgView
 {
+    private const int _maxLines = 320;
+    private const int _trimLines = 350;
+
     public MsgView()
     {
         InitializeComponent();
@@ -47,12 +51,52 @@ public partial class MsgView
 
     private void ShowMsg(object msg)
     {
+        var incoming = msg?.ToString() ?? string.Empty;
+        var old = txtMsg.Text ?? string.Empty;
+
         txtMsg.BeginChange();
-        txtMsg.Text = msg.ToString();
+
+        if (incoming.Length >= old.Length && incoming.AsSpan(0, old.Length).SequenceEqual(old))
+        {
+            var delta = incoming.AsSpan(old.Length);
+            if (!delta.IsEmpty)
+                txtMsg.AppendText(delta.ToString());
+        }
+        else
+        {
+            // 兼容增量：如果不是全量覆盖场景，直接把 incoming 当作增量追加
+            if (old.Length == 0)
+            {
+                txtMsg.Text = incoming;
+            }
+            else
+            {
+                txtMsg.AppendText(incoming);
+            }
+        }
+
+        // 行数超过阈值才裁剪到 _maxLines
+        var lines = txtMsg.Text.Split(Environment.NewLine);
+        if (lines.Length > _trimLines)
+        {
+            var start = lines.Length - _maxLines;
+            if (start < 0) start = 0;
+
+            var sb = new StringBuilder();
+            for (int i = start; i < lines.Length; i++)
+            {
+                sb.Append(lines[i]);
+                if (i < lines.Length - 1)
+                    sb.Append(Environment.NewLine);
+            }
+            txtMsg.Text = sb.ToString();
+        }
+
         if (togScrollToEnd.IsChecked ?? true)
         {
             txtMsg.ScrollToEnd();
         }
+
         txtMsg.EndChange();
     }