refactor: rewrite CommitMessageTextBox

src/Resources/Locales/en_US.axaml

@@ -105,8 +105,8 @@
   <x:String x:Key="Text.CommitDetail.Info.Parents" xml:space="preserve">PARENTS</x:String>
   <x:String x:Key="Text.CommitDetail.Info.Refs" xml:space="preserve">REFS</x:String>
   <x:String x:Key="Text.CommitDetail.Info.SHA" xml:space="preserve">SHA</x:String>
-  <x:String x:Key="Text.CommitMessageTextBox.Placeholder" xml:space="preserve">Enter commit subject &amp; message</x:String>
-  <x:String x:Key="Text.CommitMessageTextBox.Tip" xml:space="preserve">Git uses an empty line to separate the subject and extra message body.</x:String>
+  <x:String x:Key="Text.CommitMessageTextBox.SubjectPlaceholder" xml:space="preserve">Enter commit subject</x:String>
+  <x:String x:Key="Text.CommitMessageTextBox.MessagePlaceholder" xml:space="preserve">Description</x:String>
   <x:String x:Key="Text.Configure" xml:space="preserve">Repository Configure</x:String>
   <x:String x:Key="Text.Configure.Email" xml:space="preserve">Email Address</x:String>
   <x:String x:Key="Text.Configure.Email.Placeholder" xml:space="preserve">Email address</x:String>

src/Resources/Locales/zh_CN.axaml

@@ -108,8 +108,8 @@
   <x:String x:Key="Text.CommitDetail.Info.Parents" xml:space="preserve">父提交</x:String>
   <x:String x:Key="Text.CommitDetail.Info.Refs" xml:space="preserve">相关引用</x:String>
   <x:String x:Key="Text.CommitDetail.Info.SHA" xml:space="preserve">提交指纹</x:String>
-  <x:String x:Key="Text.CommitMessageTextBox.Placeholder" xml:space="preserve">填写提交信息</x:String>
-  <x:String x:Key="Text.CommitMessageTextBox.Tip" xml:space="preserve">Git使用空白行来划分提交信息中的主题与内容</x:String>
+  <x:String x:Key="Text.CommitMessageTextBox.SubjectPlaceholder" xml:space="preserve">填写提交信息主题</x:String>
+  <x:String x:Key="Text.CommitMessageTextBox.MessagePlaceholder" xml:space="preserve">详细描述</x:String>
   <x:String x:Key="Text.Configure" xml:space="preserve">仓库配置</x:String>
   <x:String x:Key="Text.Configure.Email" xml:space="preserve">电子邮箱</x:String>
   <x:String x:Key="Text.Configure.Email.Placeholder" xml:space="preserve">邮箱地址</x:String>

src/Resources/Locales/zh_TW.axaml

@@ -108,8 +108,8 @@
   <x:String x:Key="Text.CommitDetail.Info.Parents" xml:space="preserve">父提交</x:String>
   <x:String x:Key="Text.CommitDetail.Info.Refs" xml:space="preserve">相關引用</x:String>
   <x:String x:Key="Text.CommitDetail.Info.SHA" xml:space="preserve">提交指紋</x:String>
-  <x:String x:Key="Text.CommitMessageTextBox.Placeholder" xml:space="preserve">填寫提交資訊</x:String>
-  <x:String x:Key="Text.CommitMessageTextBox.Tip" xml:space="preserve">Git使用空白行來劃分提交資訊中的主題與內容</x:String>
+  <x:String x:Key="Text.CommitMessageTextBox.SubjectPlaceholder" xml:space="preserve">填寫提交信息主題</x:String>
+  <x:String x:Key="Text.CommitMessageTextBox.MessagePlaceholder" xml:space="preserve">詳細描述</x:String>
   <x:String x:Key="Text.Configure" xml:space="preserve">倉庫配置</x:String>
   <x:String x:Key="Text.Configure.Email" xml:space="preserve">電子郵箱</x:String>
   <x:String x:Key="Text.Configure.Email.Placeholder" xml:space="preserve">郵箱地址</x:String>

src/Views/CommitMessageTextBox.axaml

@@ -2,9 +2,9 @@
              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:ae="using:AvaloniaEdit"
              xmlns:c="using:SourceGit.Converters"
              xmlns:vm="using:SourceGit.ViewModels"
+             xmlns:v="using:SourceGit.Views"
              mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
              x:Class="SourceGit.Views.CommitMessageTextBox"
              x:Name="ThisControl">
@@ -12,52 +12,67 @@
           BorderThickness="1"
           BorderBrush="{DynamicResource Brush.Border2}"
           CornerRadius="4">
-    <Grid RowDefinitions="*,Auto">
-      <Grid Grid.Row="0">
-        <Rectangle x:Name="SubjectGuideLine"
-                   Height="0.8"
-                   HorizontalAlignment="Stretch"
-                   VerticalAlignment="Top"
+    <Grid RowDefinitions="Auto,1,*">
+      <Grid Grid.Row="0" ColumnDefinitions="*,1,Auto">
+        <v:EnhancedTextBox Grid.Column="0"
+                           x:Name="SubjectEditor"
+                           Classes="no_border"
+                           Margin="0"
+                           Padding="4"
+                           CornerRadius="4,4,0,0"
+                           BorderThickness="0"
+                           Background="Transparent"
+                           AcceptsReturn="False"
+                           TextWrapping="Wrap"
+                           ScrollViewer.HorizontalScrollBarVisibility="Disabled"
+                           ScrollViewer.VerticalScrollBarVisibility="Disabled"
+                           Text="{Binding #ThisControl.Subject, Mode=TwoWay}"
+                           Watermark="{DynamicResource Text.CommitMessageTextBox.SubjectPlaceholder}"
+                           PreviewKeyDown="OnSubjectTextBoxPreviewKeyDown"/>
+
+        <Rectangle Grid.Column="1"
+                   Width="1"
+                   HorizontalAlignment="Center"
+                   VerticalAlignment="Stretch"
                    IsHitTestVisible="False"
                    Fill="{DynamicResource Brush.Border2}"/>
         
-        <ae:TextEditor x:Name="TextEditor"
-                       Foreground="{DynamicResource Brush.FG1}"
-                       Background="Transparent"
-                       Padding="4"
-                       BorderThickness="0"
-                       WordWrap="True"
-                       Document="{Binding #ThisControl.Document}"
-                       TextChanged="OnTextEditorTextChanged"
-                       LayoutUpdated="OnTextEditorLayoutUpdated"/>
-        
-        <TextBlock Text="{DynamicResource Text.CommitMessageTextBox.Placeholder}"
-                   Foreground="{DynamicResource Brush.FG2}"
-                   HorizontalAlignment="Left"
-                   VerticalAlignment="Top"
-                   Margin="3"
-                   IsVisible="{Binding #ThisControl.Text, Converter={x:Static StringConverters.IsNullOrEmpty}}"
-                   IsHitTestVisible="False"/>
+        <StackPanel Grid.Column="2"
+                    Margin="8,0"
+                    VerticalAlignment="Center"
+                    Orientation="Horizontal">
+          <TextBlock Classes="monospace" Margin="2,0,0,0" FontSize="11" Text="{Binding #ThisControl.Subject.Length}" IsVisible="{Binding #ThisControl.Subject.Length, Converter={x:Static c:IntConverters.IsSubjectLengthGood}}"/>
+          <TextBlock Classes="monospace" Margin="2,0,0,0" FontSize="11" Foreground="DarkGoldenrod" Text="{Binding #ThisControl.Subject.Length}" IsVisible="{Binding #ThisControl.Subject.Length, Converter={x:Static c:IntConverters.IsSubjectLengthBad}}"/>
+          <TextBlock Classes="monospace" FontSize="11" Text="/"/>
+          <TextBlock Classes="monospace" FontSize="11" Text="{Binding Source={x:Static vm:Preference.Instance}, Path=SubjectGuideLength}"/>
+          <Path Width="10" Height="10" Margin="4,0,0,0" Data="{StaticResource Icons.Error}" Fill="DarkGoldenrod" IsVisible="{Binding #ThisControl.Subject.Length, Converter={x:Static c:IntConverters.IsSubjectLengthBad}}"/>
+        </StackPanel>
       </Grid>
       
-      <Border Grid.Row="1" CornerRadius="0,0,4,4" BorderThickness="0,1,0,0" BorderBrush="{DynamicResource Brush.Border2}" Background="{DynamicResource Brush.Window}" ClipToBounds="True">
-        <Grid ColumnDefinitions="Auto,*,Auto">
-          <Border Grid.Column="0" Background="Transparent" Width="16" Height="16" ToolTip.Tip="{DynamicResource Text.CommitMessageTextBox.Tip}">
-            <Path Height="12" Width="12" Margin="4,0,0,0" Data="{DynamicResource Icons.Info}"/>
-          </Border>
+      <Rectangle Grid.Row="1"
+                 Height="1"
+                 HorizontalAlignment="Stretch"
+                 VerticalAlignment="Center"
+                 IsHitTestVisible="False"
+                 Fill="{DynamicResource Brush.Border2}"/>
 
-          <StackPanel Grid.Column="2" Orientation="Horizontal" Margin="4,2">
-            <TextBlock Text="Subject:" FontSize="10" Foreground="{DynamicResource Brush.FG2}"/>
-            <TextBlock Classes="monospace" Margin="2,0,0,0" FontSize="11" Text="{Binding #ThisControl.SubjectLength}" IsVisible="{Binding #ThisControl.SubjectLength, Converter={x:Static c:IntConverters.IsSubjectLengthGood}}"/>
-            <TextBlock Classes="monospace" Margin="2,0,0,0" FontSize="11" Foreground="DarkGoldenrod" Text="{Binding #ThisControl.SubjectLength}" IsVisible="{Binding #ThisControl.SubjectLength, Converter={x:Static c:IntConverters.IsSubjectLengthBad}}"/>
-            <TextBlock Classes="monospace" FontSize="11" Text="/"/>
-            <TextBlock Classes="monospace" FontSize="11" Text="{Binding Source={x:Static vm:Preference.Instance}, Path=SubjectGuideLength}"/>
-            <Path Width="10" Height="10" Margin="4,0,0,0" Data="{StaticResource Icons.Error}" Fill="DarkGoldenrod" IsVisible="{Binding #ThisControl.SubjectLength, Converter={x:Static c:IntConverters.IsSubjectLengthBad}}"/>
-            <TextBlock Margin="8,0,0,0" Text="Total:" FontSize="11" Foreground="{DynamicResource Brush.FG2}"/>
-            <TextBlock Classes="monospace" Margin="2,0,0,0" FontSize="11" Text="{Binding #ThisControl.TotalLength}"/>
-          </StackPanel>
-        </Grid>
-      </Border>
+      <v:EnhancedTextBox Grid.Row="2"
+                         x:Name="DescriptionEditor"
+                         Classes="no_border"
+                         Margin="0"
+                         Padding="4"
+                         CornerRadius="0,0,4,4"
+                         BorderThickness="0"
+                         Background="Transparent"
+                         VerticalContentAlignment="Top"
+                         AcceptsReturn="True"
+                         AcceptsTab="True"
+                         TextWrapping="Wrap"
+                         ScrollViewer.HorizontalScrollBarVisibility="Disabled"
+                         ScrollViewer.VerticalScrollBarVisibility="Auto"
+                         Text="{Binding #ThisControl.Description, Mode=TwoWay}"
+                         Watermark="{DynamicResource Text.CommitMessageTextBox.MessagePlaceholder}"
+                         PreviewKeyDown="OnDescriptionTextBoxPreviewKeyDown"/>
     </Grid>
   </Border>
 </UserControl>

src/Views/CommitMessageTextBox.axaml.cs

@@ -2,22 +2,63 @@ using System;
 
 using Avalonia;
 using Avalonia.Controls;
-
-using AvaloniaEdit.Document;
-using AvaloniaEdit.Rendering;
+using Avalonia.Input;
+using Avalonia.Interactivity;
 
 namespace SourceGit.Views
 {
+    public class EnhancedTextBox : TextBox
+    {
+        public static readonly RoutedEvent<KeyEventArgs> PreviewKeyDownEvent =
+            RoutedEvent.Register<ChangeCollectionView, KeyEventArgs>(nameof(KeyEventArgs), RoutingStrategies.Tunnel | RoutingStrategies.Bubble);
+
+        public event EventHandler<KeyEventArgs> PreviewKeyDown
+        {
+            add { AddHandler(PreviewKeyDownEvent, value); }
+            remove { RemoveHandler(PreviewKeyDownEvent, value); }
+        }
+
+        protected override Type StyleKeyOverride => typeof(TextBox);
+
+        protected override void OnKeyDown(KeyEventArgs e)
+        {
+            var dump = new KeyEventArgs()
+            {
+                RoutedEvent = PreviewKeyDownEvent,
+                Route = RoutingStrategies.Direct,
+                Source = e.Source,
+                Key = e.Key,
+                KeyModifiers = e.KeyModifiers,
+                PhysicalKey = e.PhysicalKey,
+                KeySymbol = e.KeySymbol,
+            };
+
+            RaiseEvent(dump);
+
+            if (dump.Handled)
+                e.Handled = true;
+            else
+                base.OnKeyDown(e);
+        }
+    }
+
     public partial class CommitMessageTextBox : UserControl
     {
+        public enum TextChangeWay
+        {
+            None,
+            FromSource,
+            FromEditor,
+        }
+
         public static readonly StyledProperty<string> TextProperty =
             AvaloniaProperty.Register<CommitMessageTextBox, string>(nameof(Text), string.Empty);
 
-        public static readonly DirectProperty<CommitMessageTextBox, int> SubjectLengthProperty =
-            AvaloniaProperty.RegisterDirect<CommitMessageTextBox, int>(nameof(SubjectLength), o => o.SubjectLength);
+        public static readonly StyledProperty<string> SubjectProperty =
+            AvaloniaProperty.Register<CommitMessageTextBox, string>(nameof(Subject), string.Empty);
 
-        public static readonly DirectProperty<CommitMessageTextBox, int> TotalLengthProperty =
-            AvaloniaProperty.RegisterDirect<CommitMessageTextBox, int>(nameof(TotalLength), o => o.TotalLength);
+        public static readonly StyledProperty<string> DescriptionProperty =
+            AvaloniaProperty.Register<CommitMessageTextBox, string>(nameof(Description), string.Empty);
 
         public string Text
         {
@@ -25,26 +66,20 @@ namespace SourceGit.Views
             set => SetValue(TextProperty, value);
         }
 
-        public int SubjectLength
+        public string Subject
         {
-            get => _subjectLength;
-            private set => SetAndRaise(SubjectLengthProperty, ref _subjectLength, value);
+            get => GetValue(SubjectProperty);
+            set => SetValue(SubjectProperty, value);
         }
 
-        public int TotalLength
+        public string Description
         {
-            get => _totalLength;
-            private set => SetAndRaise(TotalLengthProperty, ref _totalLength, value);
-        }
-
-        public TextDocument Document
-        {
-            get;
+            get => GetValue(DescriptionProperty);
+            set => SetValue(DescriptionProperty, value);
         }
 
         public CommitMessageTextBox()
         {
-            Document = new TextDocument(Text);
             InitializeComponent();
         }
 
@@ -52,72 +87,52 @@ namespace SourceGit.Views
         {
             base.OnPropertyChanged(change);
 
-            if (change.Property == TextProperty && !_isDocumentTextChanging)
-                    Document.Text = Text;
-        }
-
-        private void OnTextEditorLayoutUpdated(object sender, EventArgs e)
-        {
-            var view = TextEditor.TextArea?.TextView;
-            if (view is { VisualLinesValid: true })
+            if (change.Property == TextProperty && _changingWay == TextChangeWay.None)
             {
-                if (_subjectEndLineNumber == 0)
+                _changingWay = TextChangeWay.FromSource;
+                var normalized = Text.ReplaceLineEndings("\n").Trim();
+                var subjectEnd = normalized.IndexOf("\n\n", StringComparison.Ordinal);
+                if (subjectEnd == -1)
                 {
-                    SubjectGuideLine.Margin = new Thickness(0, view.DefaultLineHeight + 3, 0, 0);
-                    SubjectGuideLine.IsVisible = true;
-                    return;
-                }
-                
-                foreach (var line in view.VisualLines)
-                {
-                    var lineNumber = line.FirstDocumentLine.LineNumber;
-                    if (lineNumber == _subjectEndLineNumber)
-                    {
-                        var y = line.GetTextLineVisualYPosition(line.TextLines[^1], VisualYPosition.LineBottom) - view.VerticalOffset + 3;
-                        SubjectGuideLine.Margin = new Thickness(0, y, 0, 0);
-                        SubjectGuideLine.IsVisible = true;
-                        return;
-                    }
-                }
-            }
-            
-            SubjectGuideLine.IsVisible = false;
-        }
-
-        private void OnTextEditorTextChanged(object sender, EventArgs e)
-        {
-            var text = Document.Text;
-            _isDocumentTextChanging = true;
-            SetCurrentValue(TextProperty, text);
-            TotalLength = text.Trim().Length;
-            _isDocumentTextChanging = false;
-
-            var foundData = false;
-            for (var i = 0; i < Document.LineCount; i++)
-            {
-                var line = Document.Lines[i];
-                if (line.Length == 0)
-                {
-                    if (foundData)
-                    {
-                        SubjectLength = text[..line.Offset].ReplaceLineEndings(" ").Trim().Length;
-                        return;
-                    }
+                    SetCurrentValue(SubjectProperty, normalized.ReplaceLineEndings(" "));
+                    SetCurrentValue(DescriptionProperty, string.Empty);
                 }
                 else
                 {
-                    foundData = true;
+                    SetCurrentValue(SubjectProperty, normalized.Substring(0, subjectEnd).ReplaceLineEndings(" "));
+                    SetCurrentValue(DescriptionProperty, normalized.Substring(subjectEnd + 2));
                 }
-                
-                _subjectEndLineNumber = line.LineNumber;
+                _changingWay = TextChangeWay.None;
+            }
+            else if ((change.Property == SubjectProperty || change.Property == DescriptionProperty) && _changingWay == TextChangeWay.None)
+            {
+                _changingWay = TextChangeWay.FromEditor;
+                SetCurrentValue(TextProperty, $"{Subject}\n\n{Description}");
+                _changingWay = TextChangeWay.None;
             }
-            
-            SubjectLength = text.ReplaceLineEndings(" ").Trim().Length;
         }
 
-        private bool _isDocumentTextChanging = false;
-        private int _subjectEndLineNumber = 0;
-        private int _totalLength = 0;
-        private int _subjectLength = 0;
+        private void OnSubjectTextBoxPreviewKeyDown(object sender, KeyEventArgs e)
+        {
+            if ((e.Key == Key.Enter && e.KeyModifiers == KeyModifiers.None)
+                || (e.Key == Key.Right && SubjectEditor.CaretIndex == Subject.Length))
+            {
+                DescriptionEditor.Focus();
+                DescriptionEditor.CaretIndex = 0;
+                e.Handled = true;
+            }
+        }
+
+        private void OnDescriptionTextBoxPreviewKeyDown(object sender, KeyEventArgs e)
+        {
+            if ((e.Key == Key.Back || e.Key == Key.Left) && DescriptionEditor.CaretIndex == 0)
+            {
+                SubjectEditor.Focus();
+                SubjectEditor.CaretIndex = Subject.Length;
+                e.Handled = true;
+            }
+        }
+
+        private TextChangeWay _changingWay = TextChangeWay.None;
     }
 }