feat: Allow Swap Commits in Revision Compare

src/Models/Commit.cs

@@ -6,7 +6,7 @@ using Avalonia.Media;
 
 namespace SourceGit.Models
 {
-    public class Commit
+    public class Commit: IObjectId
     {
         public static double OpacityForNotMerged
         {

src/Models/IObjectId.cs

@@ -0,0 +1,7 @@
+namespace SourceGit.Models
+{
+    public interface IObjectId
+    {
+        string SHA { get; }
+    }
+}

src/Models/Object.cs

@@ -9,7 +9,7 @@
         Commit,
     }
 
-    public class Object
+    public class Object: IObjectId
     {
         public string SHA { get; set; }
         public ObjectType Type { get; set; }

src/Resources/Locales/en_US.axaml

@@ -189,6 +189,7 @@
   <x:String x:Key="Text.Diff.VisualLines.Incr" xml:space="preserve">Increase Number of Visible Lines</x:String>
   <x:String x:Key="Text.Diff.Welcome" xml:space="preserve">SELECT FILE TO VIEW CHANGES</x:String>
   <x:String x:Key="Text.Diff.ShowHiddenSymbols" xml:space="preserve">Show hidden symbols</x:String>
+  <x:String x:Key="Text.Diff.SwapCommits" xml:space="preserve">Reverse Commits</x:String>
   <x:String x:Key="Text.DiffWithMerger" xml:space="preserve">Open In Merge Tool</x:String>
   <x:String x:Key="Text.Discard" xml:space="preserve">Discard Changes</x:String>
   <x:String x:Key="Text.Discard.All" xml:space="preserve">All local changes in working copy.</x:String>

src/Resources/Locales/zh_CN.axaml

@@ -192,6 +192,7 @@
   <x:String x:Key="Text.Diff.VisualLines.Incr" xml:space="preserve">增加可见的行数</x:String>
   <x:String x:Key="Text.Diff.Welcome" xml:space="preserve">请选择需要对比的文件</x:String>
   <x:String x:Key="Text.Diff.ShowHiddenSymbols" xml:space="preserve">显示隐藏符号</x:String>
+  <x:String x:Key="Text.Diff.SwapCommits" xml:space="preserve">反向提交</x:String>
   <x:String x:Key="Text.DiffWithMerger" xml:space="preserve">使用外部比对工具查看</x:String>
   <x:String x:Key="Text.Discard" xml:space="preserve">放弃更改确认</x:String>
   <x:String x:Key="Text.Discard.All" xml:space="preserve">所有本地址未提交的修改。</x:String>

src/Resources/Locales/zh_TW.axaml

@@ -192,6 +192,7 @@
   <x:String x:Key="Text.Diff.VisualLines.Incr" xml:space="preserve">增加可見的行數</x:String>
   <x:String x:Key="Text.Diff.Welcome" xml:space="preserve">請選擇需要對比的檔案</x:String>
   <x:String x:Key="Text.Diff.ShowHiddenSymbols" xml:space="preserve">顯示隱藏符號</x:String>
+  <x:String x:Key="Text.Diff.SwapCommits" xml:space="preserve">反向提交</x:String>
   <x:String x:Key="Text.DiffWithMerger" xml:space="preserve">使用外部比對工具檢視</x:String>
   <x:String x:Key="Text.Discard" xml:space="preserve">放棄更改確認</x:String>
   <x:String x:Key="Text.Discard.All" xml:space="preserve">所有本地址未提交的修改。</x:String>

src/ViewModels/RevisionCompare.cs

@@ -2,28 +2,26 @@
 using System.Collections.Generic;
 using System.IO;
 using System.Threading.Tasks;
-
 using Avalonia.Controls;
 using Avalonia.Threading;
-
 using CommunityToolkit.Mvvm.ComponentModel;
 
 namespace SourceGit.ViewModels
 {
-    public class CompareTargetWorktree
+    public sealed class CompareTargetWorktree : Models.IObjectId
     {
         public string SHA => string.Empty;
     }
 
     public class RevisionCompare : ObservableObject
     {
-        public Models.Commit StartPoint
+        public Models.IObjectId StartPoint
         {
             get;
             private set;
         }
 
-        public object EndPoint
+        public Models.IObjectId EndPoint
         {
             get;
             private set;
@@ -43,7 +41,7 @@ namespace SourceGit.ViewModels
                 if (SetProperty(ref _selectedChanges, value))
                 {
                     if (value != null && value.Count == 1)
-                        DiffContext = new DiffContext(_repo, new Models.DiffOption(StartPoint.SHA, _endPoint, value[0]), _diffContext);
+                        DiffContext = new DiffContext(_repo, new Models.DiffOption(StartPoint.SHA, EndPoint?.SHA ?? string.Empty, value[0]), _diffContext);
                     else
                         DiffContext = null;
                 }
@@ -76,31 +74,13 @@ namespace SourceGit.ViewModels
             if (endPoint == null)
             {
                 EndPoint = new CompareTargetWorktree();
-                _endPoint = string.Empty;
             }
             else
             {
                 EndPoint = endPoint;
-                _endPoint = endPoint.SHA;
             }
 
-            Task.Run(() =>
-            {
-                _changes = new Commands.CompareRevisions(_repo, startPoint.SHA, _endPoint).Result();
-
-                var visible = _changes;
-                if (!string.IsNullOrWhiteSpace(_searchFilter))
-                {
-                    visible = new List<Models.Change>();
-                    foreach (var c in _changes)
-                    {
-                        if (c.Path.Contains(_searchFilter, StringComparison.OrdinalIgnoreCase))
-                            visible.Add(c);
-                    }
-                }
-
-                Dispatcher.UIThread.Invoke(() => VisibleChanges = visible);
-            });
+            Task.Run(Refresh);
         }
 
         public void Cleanup()
@@ -140,7 +120,7 @@ namespace SourceGit.ViewModels
             diffWithMerger.Icon = App.CreateMenuIcon("Icons.OpenWith");
             diffWithMerger.Click += (_, ev) =>
             {
-                var opt = new Models.DiffOption(StartPoint.SHA, _endPoint, change);
+                var opt = new Models.DiffOption(StartPoint.SHA, EndPoint?.SHA ?? string.Empty, change);
                 var toolType = Preference.Instance.ExternalMergeToolType;
                 var toolPath = Preference.Instance.ExternalMergeToolPath;
 
@@ -209,8 +189,32 @@ namespace SourceGit.ViewModels
             }
         }
 
+        private void Refresh()
+        {
+            _changes = new Commands.CompareRevisions(_repo, StartPoint.SHA, EndPoint?.SHA ?? string.Empty).Result();
+
+            var visible = _changes;
+            if (!string.IsNullOrWhiteSpace(_searchFilter))
+            {
+                visible = [];
+                foreach (var c in _changes)
+                {
+                    if (c.Path.Contains(_searchFilter, StringComparison.OrdinalIgnoreCase))
+                        visible.Add(c);
+                }
+            }
+
+            Dispatcher.UIThread.Invoke(() => VisibleChanges = visible);
+        }
+
+        public void Swap()
+        {
+            (StartPoint, EndPoint) = (EndPoint, StartPoint);
+            OnPropertyChanged(string.Empty);
+            Task.Run(Refresh);
+        }
+
         private string _repo;
-        private string _endPoint;
         private List<Models.Change> _changes = null;
         private List<Models.Change> _visibleChanges = null;
         private List<Models.Change> _selectedChanges = null;

src/Views/RevisionCompare.axaml

@@ -10,56 +10,63 @@
              x:Class="SourceGit.Views.RevisionCompare"
              x:DataType="vm:RevisionCompare"
              Background="{DynamicResource Brush.Window}">
+
+  <UserControl.Resources>
+    <DataTemplate DataType="m:Commit"
+                  x:Key="CommitInfoTemplate">
+      <Grid RowDefinitions="Auto,*">
+        <Grid Grid.Row="0" ColumnDefinitions="Auto,*,Auto,Auto,Auto">
+          <v:Avatar Width="16" Height="16"
+                    VerticalAlignment="Center"
+                    IsHitTestVisible="False"
+                    User="{Binding Author}"/>
+          <TextBlock Grid.Column="1" Classes="monospace" Text="{Binding Author.Name}" Margin="8,0,0,0"/>
+          <Border Grid.Column="2" Background="{DynamicResource Brush.Accent}" CornerRadius="4" IsVisible="{Binding IsCurrentHead}">
+            <TextBlock Text="HEAD" Classes="monospace" Margin="4,0" Foreground="#FFDDDDDD"/>
+          </Border>
+          <TextBlock Grid.Column="3" Classes="monospace" Text="{Binding SHA, Converter={x:Static c:StringConverters.ToShortSHA}}" Foreground="DarkOrange" Margin="8,0,0,0" TextDecorations="Underline" PointerPressed="OnPressedSHA" />
+          <TextBlock Grid.Column="4" Classes="monospace" Text="{Binding CommitterTimeStr}" Foreground="{DynamicResource Brush.FG2}" Margin="8,0,0,0"/>
+        </Grid>
+
+        <TextBlock Grid.Row="1" Classes="monospace" Text="{Binding Subject}" VerticalAlignment="Bottom"/>
+      </Grid>
+    </DataTemplate>
+
+    <DataTemplate DataType="vm:CompareTargetWorktree"
+                  x:Key="WorktreeTemplate">
+      <Border HorizontalAlignment="Center" VerticalAlignment="Center" Background="{DynamicResource Brush.Accent}" CornerRadius="4">
+        <TextBlock Text="{DynamicResource Text.Worktree}" Classes="monospace" Margin="4,2" Foreground="#FFDDDDDD"/>
+      </Border>
+    </DataTemplate>
+  </UserControl.Resources>
+  
   <Grid RowDefinitions="50,*" Margin="4">
     <Grid Grid.Row="0" Margin="48,0,48,4" ColumnDefinitions="*,48,*">
       <Border Grid.Column="0" BorderBrush="{DynamicResource Brush.Border2}" BorderThickness="1" Background="{DynamicResource Brush.Contents}" CornerRadius="4" Padding="4">
-        <Grid RowDefinitions="Auto,*">
-          <Grid Grid.Row="0" ColumnDefinitions="Auto,*,Auto,Auto,Auto">
-            <v:Avatar Width="16" Height="16"
-                      VerticalAlignment="Center"
-                      IsHitTestVisible="False"
-                      User="{Binding StartPoint.Author}"/>
-            <TextBlock Grid.Column="1" Classes="monospace" Text="{Binding StartPoint.Author.Name}" Margin="8,0,0,0"/>
-            <Border Grid.Column="2" Background="{DynamicResource Brush.Accent}" CornerRadius="4" IsVisible="{Binding StartPoint.IsCurrentHead}">
-              <TextBlock Text="HEAD" Classes="monospace" Margin="4,0" Foreground="#FFDDDDDD"/>
-            </Border> 
-            <TextBlock Grid.Column="3" Classes="monospace" Text="{Binding StartPoint.SHA, Converter={x:Static c:StringConverters.ToShortSHA}}" Foreground="DarkOrange" Margin="8,0,0,0" TextDecorations="Underline" PointerPressed="OnPressedSHA"/>
-            <TextBlock Grid.Column="4" Classes="monospace" Text="{Binding StartPoint.CommitterTimeStr}" Foreground="{DynamicResource Brush.FG2}" Margin="8,0,0,0"/>
-          </Grid>
-
-          <TextBlock Grid.Row="1" Classes="monospace" Text="{Binding StartPoint.Subject}" VerticalAlignment="Bottom"/>
-        </Grid>
+        <ContentControl Content="{Binding StartPoint}">
+          <ContentControl.DataTemplates>
+            <StaticResource ResourceKey="CommitInfoTemplate"/>
+            <StaticResource ResourceKey="WorktreeTemplate"/>
+          </ContentControl.DataTemplates>
+        </ContentControl>
       </Border>
 
-      <Path Grid.Column="1" Width="16" Height="16" Fill="{DynamicResource Brush.FG2}" Data="{DynamicResource Icons.Down}" RenderTransformOrigin="50%,50%" RenderTransform="rotate(270deg)"/>
+      <Button Classes="icon_button"
+              Command="{Binding Swap, Mode = OneTime}"
+              Grid.Column="1"
+              HorizontalAlignment="Center"
+              ToolTip.Tip="{DynamicResource Text.Diff.SyntaxHighlight}">
+        <Path Grid.Column="1" Width="16" Height="16"
+              Fill="{DynamicResource Brush.FG2}"
+              Data="{DynamicResource Icons.Compare}"
+              />
+      </Button>
 
       <Border Grid.Column="2" BorderBrush="{DynamicResource Brush.Border2}" BorderThickness="1" Background="{DynamicResource Brush.Contents}" CornerRadius="4" Padding="4">
         <ContentControl Content="{Binding EndPoint}">
           <ContentControl.DataTemplates>
-            <DataTemplate DataType="m:Commit">
-              <Grid RowDefinitions="Auto,*">
-                <Grid Grid.Row="0" ColumnDefinitions="Auto,*,Auto,Auto,Auto">
-                  <v:Avatar Width="16" Height="16"
-                            VerticalAlignment="Center"
-                            IsHitTestVisible="False"
-                            User="{Binding Author}"/>
-                  <TextBlock Grid.Column="1" Classes="monospace" Text="{Binding Author.Name}" Margin="8,0,0,0"/>
-                  <Border Grid.Column="2" Background="{DynamicResource Brush.Accent}" CornerRadius="4" IsVisible="{Binding IsCurrentHead}">
-                    <TextBlock Text="HEAD" Classes="monospace" Margin="4,0" Foreground="#FFDDDDDD"/>
-                  </Border>
-                  <TextBlock Grid.Column="3" Classes="monospace" Text="{Binding SHA, Converter={x:Static c:StringConverters.ToShortSHA}}" Foreground="DarkOrange" Margin="8,0,0,0" TextDecorations="Underline" PointerPressed="OnPressedSHA" />
-                  <TextBlock Grid.Column="4" Classes="monospace" Text="{Binding CommitterTimeStr}" Foreground="{DynamicResource Brush.FG2}" Margin="8,0,0,0"/>
-                </Grid>
-
-                <TextBlock Grid.Row="1" Classes="monospace" Text="{Binding Subject}" VerticalAlignment="Bottom"/>
-              </Grid>
-            </DataTemplate>
-
-            <DataTemplate DataType="vm:CompareTargetWorktree">
-              <Border HorizontalAlignment="Center" VerticalAlignment="Center" Background="{DynamicResource Brush.Accent}" CornerRadius="4">
-                <TextBlock Text="{DynamicResource Text.Worktree}" Classes="monospace" Margin="4,2" Foreground="#FFDDDDDD"/>
-              </Border>
-            </DataTemplate>
+            <StaticResource ResourceKey="CommitInfoTemplate"/>
+            <StaticResource ResourceKey="WorktreeTemplate"/>
           </ContentControl.DataTemplates>
         </ContentControl>
       </Border>