feature: add a minimap to merge conflict editor

Signed-off-by: leo <longshuang@msn.cn>

src/Converters/IntConverters.cs

@@ -33,5 +33,8 @@ namespace SourceGit.Converters
 
         public static readonly FuncValueConverter<int, IBrush> ToBookmarkBrush =
             new FuncValueConverter<int, IBrush>(v => Models.Bookmarks.Get(v) ?? App.Current?.FindResource("Brush.FG1") as IBrush);
+
+        public static readonly FuncValueConverter<int, string> ToUnsolvedDesc =
+            new FuncValueConverter<int, string>(v => v == 0 ? App.Text("MergeConflictEditor.AllResolved") : App.Text("MergeConflictEditor.ConflictsRemaining", v));
     }
 }

src/ViewModels/MergeConflictEditor.cs

@@ -46,14 +46,10 @@ namespace SourceGit.ViewModels
             private set => SetProperty(ref _diffMaxLineNumber, value);
         }
 
-        public string StatusText
+        public int UnsolvedCount
         {
-            get
-            {
-                if (_unresolvedConflictCount > 0)
-                    return App.Text("MergeConflictEditor.ConflictsRemaining", _unresolvedConflictCount);
-                return App.Text("MergeConflictEditor.AllResolved");
-            }
+            get => _unsolvedCount;
+            private set => SetProperty(ref _unsolvedCount, value);
         }
 
         public Vector ScrollOffset
@@ -68,9 +64,10 @@ namespace SourceGit.ViewModels
             set => SetProperty(ref _selectedChunk, value);
         }
 
-        public IReadOnlyList<Models.ConflictRegion> ConflictRegions => _conflictRegions;
-        public bool HasUnresolvedConflicts => _unresolvedConflictCount > 0;
-        public bool HasUnsavedChanges => _unresolvedConflictCount < _conflictRegions.Count;
+        public IReadOnlyList<Models.ConflictRegion> ConflictRegions
+        {
+            get => _conflictRegions;
+        }
 
         public MergeConflictEditor(Repository repo, string filePath)
         {
@@ -126,7 +123,7 @@ namespace SourceGit.ViewModels
             if (_conflictRegions.Count == 0)
                 return true;
 
-            if (_unresolvedConflictCount > 0)
+            if (_unsolvedCount > 0)
             {
                 Error = "Cannot save: there are still unresolved conflicts.";
                 return false;
@@ -460,23 +457,21 @@ namespace SourceGit.ViewModels
             SelectedChunk = null;
             ResultDiffLines = resultLines;
 
-            var unresolved = new List<int>();
+            var unsolved = new List<int>();
             for (var i = 0; i < _conflictRegions.Count; i++)
             {
                 var r = _conflictRegions[i];
                 if (!r.IsResolved)
-                    unresolved.Add(i);
+                    unsolved.Add(i);
             }
 
-            _unresolvedConflictCount = unresolved.Count;
-            OnPropertyChanged(nameof(StatusText));
-            OnPropertyChanged(nameof(HasUnresolvedConflicts));
+            UnsolvedCount = unsolved.Count;
         }
 
         private readonly Repository _repo;
         private readonly string _filePath;
         private string _originalContent = string.Empty;
-        private int _unresolvedConflictCount = 0;
+        private int _unsolvedCount = 0;
         private int _diffMaxLineNumber = 0;
         private List<Models.TextDiffLine> _oursDiffLines = [];
         private List<Models.TextDiffLine> _theirsDiffLines = [];

src/Views/MergeConflictEditor.axaml

@@ -5,6 +5,7 @@
                     xmlns:m="using:SourceGit.Models"
                     xmlns:vm="using:SourceGit.ViewModels"
                     xmlns:v="using:SourceGit.Views"
+                    xmlns:c="using:SourceGit.Converters"
                     mc:Ignorable="d" d:DesignWidth="1200" d:DesignHeight="800"
                     x:Class="SourceGit.Views.MergeConflictEditor"
                     x:DataType="vm:MergeConflictEditor"
@@ -51,7 +52,7 @@
                   ToolTip.Tip="{DynamicResource Text.MergeConflictEditor.PrevConflict}"
                   Click="OnGotoPrevConflict"
                   HotKey="{OnPlatform Ctrl+Up, macOS=⌘+Up}"
-                  IsEnabled="{Binding HasUnresolvedConflicts, Mode=OneWay}">
+                  IsEnabled="{Binding UnsolvedCount, Converter={x:Static c:IntConverters.IsGreaterThanZero}, Mode=OneWay}">
             <Path Width="12" Height="12" Margin="0,6,0,0" Data="{StaticResource Icons.Up}"/>
           </Button>
           <Button Classes="icon_button"
@@ -59,12 +60,13 @@
                   ToolTip.Tip="{DynamicResource Text.MergeConflictEditor.NextConflict}"
                   Click="OnGotoNextConflict"
                   HotKey="{OnPlatform Ctrl+Down, macOS=⌘+Down}"
-                  IsEnabled="{Binding HasUnresolvedConflicts, Mode=OneWay}">
+                  IsEnabled="{Binding UnsolvedCount, Converter={x:Static c:IntConverters.IsGreaterThanZero}, Mode=OneWay}">
             <Path Width="12" Height="12" Margin="0,6,0,0" Data="{StaticResource Icons.Down}"/>
           </Button>
           
           <!-- Info Bar -->
-          <TextBlock Text="{Binding StatusText}" VerticalAlignment="Center"/>
+          <TextBlock Text="{Binding UnsolvedCount, Converter={x:Static c:IntConverters.ToUnsolvedDesc}, Mode=OneWay}"
+                     VerticalAlignment="Center"/>
           <Rectangle Width="1" Fill="{DynamicResource Brush.Border2}" Margin="4,6"/>
 
           <!-- Save -->
@@ -78,9 +80,9 @@
     </Border>
 
     <!-- Main Content -->
-    <Grid Grid.Row="2" RowDefinitions="*,*">
+    <Grid Grid.Row="2" RowDefinitions="*,*" ColumnDefinitions="*,20">
       <!-- Mine and Theirs Panels (Side-by-Side) -->
-      <Grid Grid.Row="0" ColumnDefinitions="*,*" Margin="4,4,4,2">
+      <Grid Grid.Row="0" Grid.Column="0" ColumnDefinitions="*,*" Margin="4,4,4,2">
         <!-- Mine (Ours) Panel -->
         <Border Grid.Column="0" Margin="0,0,2,0">
           <Grid RowDefinitions="Auto,*" Background="{DynamicResource Brush.Contents}">
@@ -163,7 +165,7 @@
       </Grid>
 
       <!-- Result Panel -->
-      <Border Grid.Row="1" Margin="4,2,4,4">
+      <Border Grid.Row="1" Grid.Column="0" Margin="4,2,4,4">
         <Grid RowDefinitions="Auto,*" Background="{DynamicResource Brush.Contents}">
           <Border Grid.Row="0" Padding="8,4" Background="{DynamicResource Brush.ToolBar}" BorderThickness="1,1,1,0" BorderBrush="{DynamicResource Brush.Border2}">
             <TextBlock Text="{DynamicResource Text.MergeConflictEditor.Result}" FontWeight="Bold"/>
@@ -247,6 +249,14 @@
           </Grid>
         </Grid>
       </Border>
+
+      <!-- Minimap -->
+      <Border Grid.Row="0" Grid.RowSpan="2" Grid.Column="1"
+              Margin="0,0,4,4"
+              BorderThickness="1,0,1,1" BorderBrush="{DynamicResource Brush.Border2}">
+        <v:MergeConflictMinimap DisplayRange="{Binding #ResultPresenter.DisplayRange, Mode=OneWay}"
+                                UnsolvedCount="{Binding UnsolvedCount, Mode=OneWay}"/>
+      </Border>
     </Grid>
 
     <!-- Error -->

src/Views/MergeConflictEditor.axaml.cs

@@ -12,6 +12,7 @@ using Avalonia.Input;
 using Avalonia.Interactivity;
 using Avalonia.Media;
 using Avalonia.Threading;
+using Avalonia.VisualTree;
 
 using AvaloniaEdit;
 using AvaloniaEdit.Document;
@@ -105,6 +106,15 @@ namespace SourceGit.Views
             set => SetValue(SelectedChunkProperty, value);
         }
 
+        public static readonly StyledProperty<ViewModels.TextDiffDisplayRange> DisplayRangeProperty =
+            AvaloniaProperty.Register<MergeDiffPresenter, ViewModels.TextDiffDisplayRange>(nameof(DisplayRange));
+
+        public ViewModels.TextDiffDisplayRange DisplayRange
+        {
+            get => GetValue(DisplayRangeProperty);
+            set => SetValue(DisplayRangeProperty, value);
+        }
+
         protected override Type StyleKeyOverride => typeof(TextEditor);
 
         public MergeDiffPresenter() : base(new TextArea(), new TextDocument())
@@ -147,7 +157,10 @@ namespace SourceGit.Views
             TextArea.TextView.PointerEntered += OnTextViewPointerChanged;
             TextArea.TextView.PointerMoved += OnTextViewPointerChanged;
             TextArea.TextView.PointerWheelChanged += OnTextViewPointerWheelChanged;
+            TextArea.TextView.VisualLinesChanged += OnTextViewVisualLinesChanged;
             TextArea.TextView.LineTransformers.Add(new MergeDiffIndicatorTransformer(this));
+
+            OnTextViewVisualLinesChanged(null, null);
         }
 
         protected override void OnUnloaded(RoutedEventArgs e)
@@ -156,6 +169,7 @@ namespace SourceGit.Views
             TextArea.TextView.PointerEntered -= OnTextViewPointerChanged;
             TextArea.TextView.PointerMoved -= OnTextViewPointerChanged;
             TextArea.TextView.PointerWheelChanged -= OnTextViewPointerWheelChanged;
+            TextArea.TextView.VisualLinesChanged -= OnTextViewVisualLinesChanged;
 
             if (_textMate != null)
             {
@@ -253,6 +267,34 @@ namespace SourceGit.Views
             Dispatcher.UIThread.Post(() => UpdateSelectedChunkPosition(vm, y));
         }
 
+        private void OnTextViewVisualLinesChanged(object sender, EventArgs e)
+        {
+            if (!TextArea.TextView.VisualLinesValid)
+            {
+                SetCurrentValue(DisplayRangeProperty, null);
+                return;
+            }
+
+            var lines = DiffLines;
+            var start = int.MaxValue;
+            var count = 0;
+            foreach (var line in TextArea.TextView.VisualLines)
+            {
+                if (line.IsDisposed || line.FirstDocumentLine == null || line.FirstDocumentLine.IsDeleted)
+                    continue;
+
+                var index = line.FirstDocumentLine.LineNumber - 1;
+                if (index >= lines.Count)
+                    continue;
+
+                count++;
+                if (start > index)
+                    start = index;
+            }
+
+            SetCurrentValue(DisplayRangeProperty, new ViewModels.TextDiffDisplayRange(start, start + count));
+        }
+
         private void OnTextViewScrollChanged(object sender, ScrollChangedEventArgs e)
         {
             if (_scrollViewer == null || DataContext is not ViewModels.MergeConflictEditor vm)
@@ -525,6 +567,97 @@ namespace SourceGit.Views
         private readonly MergeDiffPresenter _presenter;
     }
 
+    public class MergeConflictMinimap : Control
+    {
+        public static readonly StyledProperty<ViewModels.TextDiffDisplayRange> DisplayRangeProperty =
+            AvaloniaProperty.Register<MergeConflictMinimap, ViewModels.TextDiffDisplayRange>(nameof(DisplayRange));
+
+        public ViewModels.TextDiffDisplayRange DisplayRange
+        {
+            get => GetValue(DisplayRangeProperty);
+            set => SetValue(DisplayRangeProperty, value);
+        }
+
+        public static readonly StyledProperty<int> UnsolvedCountProperty =
+            AvaloniaProperty.Register<MergeConflictMinimap, int>(nameof(UnsolvedCount));
+
+        public int UnsolvedCount
+        {
+            get => GetValue(UnsolvedCountProperty);
+            set => SetValue(UnsolvedCountProperty, value);
+        }
+
+        public override void Render(DrawingContext context)
+        {
+            context.DrawRectangle(Brushes.Transparent, null, new Rect(0, 0, Bounds.Width, Bounds.Height));
+
+            if (DataContext is not ViewModels.MergeConflictEditor vm)
+                return;
+
+            var total = vm.OursDiffLines.Count;
+            var unitHeight = Bounds.Height / (total * 1.0);
+            var conflicts = vm.ConflictRegions;
+            var blockBGs = new SolidColorBrush[] { new SolidColorBrush(Colors.Red, 0.6), new SolidColorBrush(Colors.Green, 0.6) };
+            foreach (var c in conflicts)
+            {
+                var topY = c.StartLineInOriginal * unitHeight;
+                var bottomY = (c.EndLineInOriginal + 1) * unitHeight;
+                var bg = blockBGs[c.IsResolved ? 1 : 0];
+                context.DrawRectangle(bg, null, new Rect(0, topY, Bounds.Width, bottomY - topY));
+            }
+
+            var range = DisplayRange;
+            if (range == null || range.End == 0)
+                return;
+
+            var startY = range.Start * unitHeight;
+            var endY = range.End * unitHeight;
+            var color = (Color)this.FindResource("SystemAccentColor");
+            var brush = new SolidColorBrush(color, 0.2);
+            var pen = new Pen(color.ToUInt32());
+            var rect = new Rect(0, startY, Bounds.Width, endY - startY);
+
+            context.DrawRectangle(brush, null, rect);
+            context.DrawLine(pen, rect.TopLeft, rect.TopRight);
+            context.DrawLine(pen, rect.BottomLeft, rect.BottomRight);
+        }
+
+        protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs change)
+        {
+            base.OnPropertyChanged(change);
+
+            if (change.Property == DisplayRangeProperty ||
+                change.Property == UnsolvedCountProperty ||
+                change.Property.Name.Equals(nameof(ActualThemeVariant), StringComparison.Ordinal))
+                InvalidateVisual();
+        }
+
+        protected override void OnPointerPressed(PointerPressedEventArgs e)
+        {
+            base.OnPointerPressed(e);
+
+            if (DataContext is not ViewModels.MergeConflictEditor vm)
+                return;
+
+            var total = vm.OursDiffLines.Count;
+            var range = DisplayRange;
+            if (range == null || range.End == 0)
+                return;
+
+            var unitHeight = Bounds.Height / (total * 1.0);
+            var startY = range.Start * unitHeight;
+            var endY = range.End * unitHeight;
+            var pressedY = e.GetPosition(this).Y;
+            if (pressedY >= startY && pressedY <= endY)
+                return;
+
+            var line = Math.Max(1, Math.Min(total, (int)Math.Ceiling(pressedY / unitHeight)));
+            var editor = this.FindAncestorOfType<MergeConflictEditor>();
+            if (editor != null)
+                editor.OursPresenter.ScrollToLine(line);
+        }
+    }
+
     public partial class MergeConflictEditor : ChromelessWindow
     {
         public MergeConflictEditor()
@@ -547,7 +680,7 @@ namespace SourceGit.Views
             if (DataContext is not ViewModels.MergeConflictEditor vm)
                 return;
 
-            if (_forceClose || !vm.HasUnsavedChanges)
+            if (_forceClose || vm.UnsolvedCount < vm.ConflictRegions.Count)
             {
                 vm.PropertyChanged -= OnViewModelPropertyChanged;
                 return;
@@ -580,7 +713,7 @@ namespace SourceGit.Views
 
         private void OnGotoPrevConflict(object sender, RoutedEventArgs e)
         {
-            if (IsLoaded && DataContext is ViewModels.MergeConflictEditor vm && vm.HasUnresolvedConflicts)
+            if (IsLoaded && DataContext is ViewModels.MergeConflictEditor vm && vm.UnsolvedCount > 0)
             {
                 var view = OursPresenter.TextArea?.TextView;
                 var lines = vm.OursDiffLines;
@@ -623,7 +756,7 @@ namespace SourceGit.Views
 
         private void OnGotoNextConflict(object sender, RoutedEventArgs e)
         {
-            if (IsLoaded && DataContext is ViewModels.MergeConflictEditor vm && vm.HasUnresolvedConflicts)
+            if (IsLoaded && DataContext is ViewModels.MergeConflictEditor vm && vm.UnsolvedCount > 0)
             {
                 var view = OursPresenter.TextArea?.TextView;
                 var lines = vm.OursDiffLines;