enhance: cancel updating repository status when Welcome page is unloaded

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

Author: love-linger

src/ViewModels/RepositoryNode.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.IO;
 using System.Text.Json.Serialization;
+using System.Threading;
 using System.Threading.Tasks;
 using CommunityToolkit.Mvvm.ComponentModel;
 
@@ -130,16 +131,19 @@ public void Delete()
                 activePage.Popup = new DeleteRepositoryNode(this);
         }
 
-        public async Task UpdateStatusAsync(bool force)
+        public async Task UpdateStatusAsync(bool force, CancellationToken? token)
         {
+            if (token is { IsCancellationRequested: true })
+                return;
+
             if (!_isRepository || !Directory.Exists(_id))
             {
                 Status = null;
 
                 if (SubNodes.Count > 0)
                 {
                     foreach (var subNode in SubNodes)
-                        await subNode.UpdateStatusAsync(force);
+                        await subNode.UpdateStatusAsync(force, token);
                 }
 
                 return;

src/ViewModels/Welcome.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Threading;
 using System.Threading.Tasks;
 
 using Avalonia.Collections;
@@ -52,10 +53,10 @@ public void Refresh()
             Rows.AddRange(rows);
         }
 
-        public async Task UpdateStatusAsync(bool force)
+        public async Task UpdateStatusAsync(bool force, CancellationToken? token)
         {
             foreach (var node in Preferences.Instance.RepositoryNodes)
-                await node.UpdateStatusAsync(force);
+                await node.UpdateStatusAsync(force, token);
         }
 
         public void ToggleNodeIsExpanded(RepositoryNode node)

src/Views/Launcher.axaml.cs

@@ -269,7 +269,7 @@ protected override async void OnKeyDown(KeyEventArgs e)
                 else if (vm.ActivePage.Data is ViewModels.Welcome welcome)
                 {
                     e.Handled = true;
-                    await welcome.UpdateStatusAsync(true);
+                    await welcome.UpdateStatusAsync(true, null);
                     return;
                 }
             }

src/Views/Welcome.axaml.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Threading;
 using Avalonia;
 using Avalonia.Controls;
 using Avalonia.Controls.Primitives;
@@ -64,7 +65,13 @@ public Welcome()
         protected override async void OnLoaded(RoutedEventArgs e)
         {
             base.OnLoaded(e);
-            await ViewModels.Welcome.Instance.UpdateStatusAsync(false);
+            await ViewModels.Welcome.Instance.UpdateStatusAsync(false, _cancellation.Token);
+        }
+
+        protected override void OnUnloaded(RoutedEventArgs e)
+        {
+            _cancellation.Cancel();
+            base.OnUnloaded(e);
         }
 
         protected override void OnKeyDown(KeyEventArgs e)
@@ -361,5 +368,6 @@ private void OnDoubleTappedTreeNode(object sender, TappedEventArgs e)
         private Point _pressedTreeNodePosition = new Point();
         private bool _startDragTreeNode = false;
         private readonly DataFormat<string> _dndRepoNode = DataFormat.CreateStringApplicationFormat("sourcegit-dnd-repo-node");
+        private CancellationTokenSource _cancellation = new CancellationTokenSource();
     }
 }