refactor: use a custom indent icon instead of tree depth margin for worktrees

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

src/ViewModels/Worktree.cs

@@ -10,10 +10,10 @@ namespace SourceGit.ViewModels
         public Models.Worktree Backend { get; private set; }
         public bool IsMain { get; private set; }
         public bool IsCurrent { get; private set; }
+        public bool IsLast { get; private set; }
         public string DisplayPath { get; private set; }
         public string Name { get; private set; }
         public string Branch { get; private set; }
-        public int Depth { get; private set; }
 
         public bool IsLocked
         {
@@ -24,15 +24,15 @@ namespace SourceGit.ViewModels
         public string FullPath => Backend.FullPath;
         public string Head => Backend.Head;
 
-        public Worktree(DirectoryInfo repo, Models.Worktree wt, bool isMain)
+        public Worktree(DirectoryInfo repo, Models.Worktree wt, bool isMain, bool isLast)
         {
             Backend = wt;
             IsMain = isMain;
             IsCurrent = IsCurrentWorktree(repo, wt);
+            IsLast = isLast;
             DisplayPath = IsCurrent ? string.Empty : Path.GetRelativePath(repo.FullName, wt.FullPath);
             Name = GenerateName();
             Branch = GenerateBranchName();
-            Depth = isMain ? 0 : 1;
             IsLocked = wt.IsLocked;
         }
 
@@ -43,9 +43,9 @@ namespace SourceGit.ViewModels
 
             var repoDir = new DirectoryInfo(repo);
             var nodes = new List<Worktree>();
-            nodes.Add(new(repoDir, worktrees[0], true));
+            nodes.Add(new(repoDir, worktrees[0], true, false));
             for (int i = 1; i < worktrees.Count; i++)
-                nodes.Add(new(repoDir, worktrees[i], false));
+                nodes.Add(new(repoDir, worktrees[i], false, i == worktrees.Count - 1));
 
             return nodes;
         }

src/Views/Repository.axaml

@@ -412,7 +412,7 @@
                    Height="0"
                    Margin="12,0,4,0"
                    Classes="repo_left_content_list"
-                   ItemsSource="{Binding Worktrees}"
+                   ItemsSource="{Binding Worktrees, Mode=OneWay}"
                    SelectionMode="Single"
                    PropertyChanged="OnWorktreeListPropertyChanged"
                    IsVisible="{Binding IsWorktreeGroupExpanded, Mode=OneWay}">
@@ -473,13 +473,12 @@
                       </Grid>
                     </StackPanel>
                   </ToolTip.Tip>
-                  <Grid ColumnDefinitions="Auto,*,22"
-                        Margin="{Binding Depth, Converter={x:Static c:IntConverters.ToTreeMargin}}"
-                        VerticalAlignment="Center">
-                    <v:WorktreeIcon Grid.Column="0"
+                  <Grid ColumnDefinitions="Auto,Auto,*,22" VerticalAlignment="Center">
+                    <v:WorktreeDepthIcon Grid.Column="0" Brush="{DynamicResource Brush.Border1}"/>
+                    <v:WorktreeIcon Grid.Column="1"
                                     Width="10" Height="10"
                                     Margin="8,0,0,0"/>
-                    <TextBlock Grid.Column="1"
+                    <TextBlock Grid.Column="2"
                                Margin="8,0,0,0"
                                Foreground="{DynamicResource Brush.FG2}"
                                TextTrimming="CharacterEllipsis">
@@ -488,7 +487,7 @@
                            Foreground="{DynamicResource Brush.FG1}"/>
                       <Run Text="{Binding DisplayPath, Mode=OneWay}"/>
                     </TextBlock>
-                    <Path Grid.Column="2"
+                    <Path Grid.Column="3"
                           Width="10" Height="10"
                           Margin="4,0,0,0"
                           Data="{StaticResource Icons.Lock}"

src/Views/WorktreeDepthIcon.cs

@@ -0,0 +1,59 @@
+using System;
+
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Media;
+
+namespace SourceGit.Views
+{
+    public class WorktreeDepthIcon : Control
+    {
+        public static readonly StyledProperty<IBrush> BrushProperty =
+            AvaloniaProperty.Register<WorktreeDepthIcon, IBrush>(nameof(Brush), Brushes.Transparent);
+
+        public IBrush Brush
+        {
+            get => GetValue(BrushProperty);
+            set => SetValue(BrushProperty, value);
+        }
+
+        public override void Render(DrawingContext context)
+        {
+            if (DataContext is ViewModels.Worktree wt)
+            {
+                if (wt.IsMain)
+                    return;
+
+                var pen = new Pen(Brush);
+                var h = Bounds.Height;
+                var halfH = h * 0.5;
+
+                if (wt.IsLast)
+                    context.DrawLine(pen, new Point(12.5, 0), new Point(12.5, halfH));
+                else
+                    context.DrawLine(pen, new Point(12.5, 0), new Point(12.5, h));
+
+                context.DrawLine(pen, new Point(12.5, halfH), new Point(18, halfH));
+            }
+        }
+
+        protected override void OnDataContextChanged(EventArgs e)
+        {
+            base.OnDataContextChanged(e);
+            InvalidateMeasure();
+        }
+
+        protected override Size MeasureOverride(Size availableSize)
+        {
+            if (DataContext is ViewModels.Worktree wt)
+            {
+                if (wt.IsMain)
+                    return new Size(0, 0);
+
+                return new Size(18, availableSize.Height);
+            }
+
+            return new Size(0, 0);
+        }
+    }
+}