feature: double-clicking tag will try to checkout (detached mode) the revision refered by selected tag (#1661)

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

Author: love-linger

src/ViewModels/Repository.cs

@@ -1448,6 +1448,13 @@ public void CheckoutBranch(Models.Branch branch)
             }
         }
 
+        public async Task CheckoutTagAsync(Models.Tag tag)
+        {
+            var c = await new Commands.QuerySingleCommit(_fullpath, tag.SHA).GetResultAsync();
+            if (c != null)
+                _histories?.CheckoutBranchByCommit(c);
+        }
+
         public async Task CompareBranchWithWorktree(Models.Branch branch)
         {
             if (_histories != null)

src/Views/TagsView.axaml

@@ -96,6 +96,7 @@
             <Border Height="24"
                     Background="Transparent"
                     PointerPressed="OnItemPointerPressed"
+                    DoubleTapped="OnItemDoubleTapped"
                     ContextRequested="OnItemContextRequested"
                     ToolTip.Placement="Right">
               <ToolTip.Tip>

src/Views/TagsView.axaml.cs

@@ -155,10 +155,20 @@ protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs chang
             }
         }
 
-        private void OnItemDoubleTapped(object sender, TappedEventArgs e)
+        private async void OnItemDoubleTapped(object sender, TappedEventArgs e)
         {
-            if (sender is Control { DataContext: ViewModels.TagTreeNode { IsFolder: true } node })
-                ToggleNodeIsExpanded(node);
+            if (sender is Control { DataContext: ViewModels.TagTreeNode node })
+            {
+                if (node.IsFolder)
+                    ToggleNodeIsExpanded(node);
+                else if (DataContext is ViewModels.Repository repo)
+                    await repo.CheckoutTagAsync(node.Tag);
+            }
+            else if (sender is Control { DataContext: Models.Tag tag })
+            {
+                if (DataContext is ViewModels.Repository repo)
+                    await repo.CheckoutTagAsync(tag);
+            }
 
             e.Handled = true;
         }