refactor: delay starting background tasks

* start background task only it is needed * solve the problem that we can not use `ViewModels.Preference.Instance` until resource ready * remove avatar sever settings
2024-10-31 13:03:20 -07:00 · 2024-08-18 23:09:55 +08:00 · 2024-08-18 23:09:55 +08:00 · 7fe1df20cc
commit 7fe1df20cc
parent e7921db339
13 changed files with 178 additions and 190 deletions
--- a/src/App.axaml.cs
+++ b/src/App.axaml.cs
@ -528,6 +528,8 @@ namespace SourceGit
        private void TryLaunchedAsNormal(IClassicDesktopStyleApplicationLifetime desktop)
        {
            Native.OS.SetupEnternalTools();
+            Models.AvatarManager.Instance.Start();
+            Models.AutoFetchManager.Instance.Start();

            string startupRepo = null;
            if (desktop.Args != null && desktop.Args.Length == 1 && Directory.Exists(desktop.Args[0]))
--- a/src/Commands/Fetch.cs
+++ b/src/Commands/Fetch.cs
@ -26,7 +26,7 @@ namespace SourceGit.Commands

            Args += remote;

-            AutoFetch.MarkFetched(repo);
+            Models.AutoFetchManager.Instance.MarkFetched(repo);
        }

        public Fetch(string repo, string remote, string localBranch, string remoteBranch, Action<string> outputHandler)
@ -46,110 +46,4 @@ namespace SourceGit.Commands

        private readonly Action<string> _outputHandler;
    }
-
-    public class AutoFetch
-    {
-        public static bool IsEnabled
-        {
-            get;
-            set;
-        } = false;
-
-        public static int Interval
-        {
-            get => _interval;
-            set
-            {
-                if (value < 1)
-                    return;
-                _interval = value;
-                lock (_lock)
-                {
-                    foreach (var job in _jobs)
-                    {
-                        job.Value.NextRunTimepoint = DateTime.Now.AddMinutes(Convert.ToDouble(_interval));
-                    }
-                }
-            }
-        }
-
-        class Job
-        {
-            public Fetch Cmd = null;
-            public DateTime NextRunTimepoint = DateTime.MinValue;
-        }
-
-        static AutoFetch()
-        {
-            Task.Run(() =>
-            {
-                while (true)
-                {
-                    if (!IsEnabled)
-                    {
-                        Thread.Sleep(10000);
-                        continue;
-                    }
-
-                    var now = DateTime.Now;
-                    var uptodate = new List<Job>();
-                    lock (_lock)
-                    {
-                        foreach (var job in _jobs)
-                        {
-                            if (job.Value.NextRunTimepoint.Subtract(now).TotalSeconds <= 0)
-                            {
-                                uptodate.Add(job.Value);
-                            }
-                        }
-                    }
-
-                    foreach (var job in uptodate)
-                    {
-                        job.Cmd.Exec();
-                        job.NextRunTimepoint = DateTime.Now.AddMinutes(Convert.ToDouble(Interval));
-                    }
-
-                    Thread.Sleep(2000);
-                }
-            });
-        }
-
-        public static void AddRepository(string repo)
-        {
-            var job = new Job
-            {
-                Cmd = new Fetch(repo, "--all", true, false, null) { RaiseError = false },
-                NextRunTimepoint = DateTime.Now.AddMinutes(Convert.ToDouble(Interval)),
-            };
-
-            lock (_lock)
-            {
-                _jobs[repo] = job;
-            }
-        }
-
-        public static void RemoveRepository(string repo)
-        {
-            lock (_lock)
-            {
-                _jobs.Remove(repo);
-            }
-        }
-
-        public static void MarkFetched(string repo)
-        {
-            lock (_lock)
-            {
-                if (_jobs.TryGetValue(repo, out var value))
-                {
-                    value.NextRunTimepoint = DateTime.Now.AddMinutes(Convert.ToDouble(Interval));
-                }
-            }
-        }
-
-        private static readonly Dictionary<string, Job> _jobs = new Dictionary<string, Job>();
-        private static readonly object _lock = new object();
-        private static int _interval = 10;
-    }
 }
--- a/src/Models/AutoFetchManager.cs
+++ b/src/Models/AutoFetchManager.cs
@ -0,0 +1,120 @@
+using System;
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace SourceGit.Models
+{
+    public class AutoFetchManager
+    {
+        public static AutoFetchManager Instance
+        {
+            get
+            {
+                if (_instance == null)
+                    _instance = new AutoFetchManager();
+
+                return _instance;
+            }
+        }
+        
+        public class Job
+        {
+            public Commands.Fetch Cmd = null;
+            public DateTime NextRunTimepoint = DateTime.MinValue;
+        }
+        
+        public bool IsEnabled
+        {
+            get;
+            set;
+        } = false;
+
+        public int Interval
+        {
+            get => _interval;
+            set
+            {
+                _interval = Math.Max(1, value);
+                
+                lock (_lock)
+                {
+                    foreach (var job in _jobs)
+                        job.Value.NextRunTimepoint = DateTime.Now.AddMinutes(_interval * 1.0);
+                }
+            }
+        }
+
+        private static AutoFetchManager _instance = null;
+        private Dictionary<string, Job> _jobs = new Dictionary<string, Job>();
+        private object _lock = new object();
+        private int _interval = 10;
+
+        public void Start()
+        {
+            Task.Run(() =>
+            {
+                while (true)
+                {
+                    if (!IsEnabled)
+                    {
+                        Thread.Sleep(10000);
+                        continue;
+                    }
+
+                    var now = DateTime.Now;
+                    var uptodate = new List<Job>();
+                    lock (_lock)
+                    {
+                        foreach (var job in _jobs)
+                        {
+                            if (job.Value.NextRunTimepoint.Subtract(now).TotalSeconds <= 0)
+                                uptodate.Add(job.Value);
+                        }
+                    }
+
+                    foreach (var job in uptodate)
+                    {
+                        job.Cmd.Exec();
+                        job.NextRunTimepoint = DateTime.Now.AddMinutes(Convert.ToDouble(Interval));
+                    }
+
+                    Thread.Sleep(2000);
+                }
+                
+                // ReSharper disable once FunctionNeverReturns
+            });
+        }
+
+        public void AddRepository(string repo)
+        {
+            var job = new Job
+            {
+                Cmd = new Commands.Fetch(repo, "--all", true, false, null) { RaiseError = false },
+                NextRunTimepoint = DateTime.Now.AddMinutes(Convert.ToDouble(Interval)),
+            };
+
+            lock (_lock)
+            {
+                _jobs[repo] = job;
+            }
+        }
+
+        public void RemoveRepository(string repo)
+        {
+            lock (_lock)
+            {
+                _jobs.Remove(repo);
+            }
+        }
+
+        public void MarkFetched(string repo)
+        {
+            lock (_lock)
+            {
+                if (_jobs.TryGetValue(repo, out var value))
+                    value.NextRunTimepoint = DateTime.Now.AddMinutes(Interval * 1.0);
+            }
+        }
+    }
+}
--- a/src/Models/AvatarManager.cs
+++ b/src/Models/AvatarManager.cs
@ -20,15 +20,31 @@ namespace SourceGit.Models
        void OnAvatarResourceChanged(string email);
    }

-    public static partial class AvatarManager
+    public partial class AvatarManager
    {
-        public static string SelectedServer
+        public static AvatarManager Instance
        {
-            get;
-            set;
-        } = "https://www.gravatar.com/avatar/";
+            get
+            {
+                if (_instance == null)
+                    _instance = new AvatarManager();

-        static AvatarManager()
+                return _instance;
+            }
+        }
+        
+        private static AvatarManager _instance = null;
+        
+        [GeneratedRegex(@"^(?:(\d+)\+)?(.+?)@users\.noreply\.github\.com$")]
+        private static partial Regex REG_GITHUB_USER_EMAIL();
+
+        private object _synclock = new object();
+        private string _storePath;
+        private List<IAvatarHost> _avatars = new List<IAvatarHost>();
+        private Dictionary<string, Bitmap> _resources = new Dictionary<string, Bitmap>();
+        private HashSet<string> _requesting = new HashSet<string>();
+        
+        public void Start()
        {
            _storePath = Path.Combine(Native.OS.DataDir, "avatars");
            if (!Directory.Exists(_storePath))
@ -62,7 +78,7 @@ namespace SourceGit.Models
                    var matchGithubUser = REG_GITHUB_USER_EMAIL().Match(email);
                    var url = matchGithubUser.Success ?
                        $"https://avatars.githubusercontent.com/{matchGithubUser.Groups[2].Value}" :
-                        $"{SelectedServer}{md5}?d=404";
+                        $"https://www.gravatar.com/avatar/{md5}?d=404";

                    var localFile = Path.Combine(_storePath, md5);
                    var img = null as Bitmap;
@ -105,20 +121,22 @@ namespace SourceGit.Models
                        NotifyResourceChanged(email);
                    });
                }
+                
+                // ReSharper disable once FunctionNeverReturns
            });
        }

-        public static void Subscribe(IAvatarHost host)
+        public void Subscribe(IAvatarHost host)
        {
            _avatars.Add(host);
        }

-        public static void Unsubscribe(IAvatarHost host)
+        public void Unsubscribe(IAvatarHost host)
        {
            _avatars.Remove(host);
        }

-        public static Bitmap Request(string email, bool forceRefetch)
+        public Bitmap Request(string email, bool forceRefetch)
        {
            if (forceRefetch)
            {
@ -167,7 +185,7 @@ namespace SourceGit.Models
            return null;
        }

-        private static string GetEmailHash(string email)
+        private string GetEmailHash(string email)
        {
            var lowered = email.ToLower(CultureInfo.CurrentCulture).Trim();
            var hash = MD5.Create().ComputeHash(Encoding.Default.GetBytes(lowered));
@ -177,21 +195,12 @@ namespace SourceGit.Models
            return builder.ToString();
        }

-        private static void NotifyResourceChanged(string email)
+        private void NotifyResourceChanged(string email)
        {
            foreach (var avatar in _avatars)
            {
                avatar.OnAvatarResourceChanged(email);
            }
        }
-
-        private static readonly object _synclock = new object();
-        private static readonly string _storePath;
-        private static readonly List<IAvatarHost> _avatars = new List<IAvatarHost>();
-        private static readonly Dictionary<string, Bitmap> _resources = new Dictionary<string, Bitmap>();
-        private static readonly HashSet<string> _requesting = new HashSet<string>();
-
-        [GeneratedRegex(@"^(?:(\d+)\+)?(.+?)@users\.noreply\.github\.com$")]
-        private static partial Regex REG_GITHUB_USER_EMAIL();
    }
 }
--- a/src/Resources/Locales/de_DE.axaml
+++ b/src/Resources/Locales/de_DE.axaml
@ -378,7 +378,6 @@
  <x:String x:Key="Text.Preference.Appearance.Theme" xml:space="preserve">Design</x:String>
  <x:String x:Key="Text.Preference.Appearance.ThemeOverrides" xml:space="preserve">Design-Anpassungen</x:String>
  <x:String x:Key="Text.Preference.General" xml:space="preserve">ALLGEMEIN</x:String>
-  <x:String x:Key="Text.Preference.General.AvatarServer" xml:space="preserve">Avatar Server</x:String>
  <x:String x:Key="Text.Preference.General.Check4UpdatesOnStartup" xml:space="preserve">Beim Starten nach Updates suchen</x:String>
  <x:String x:Key="Text.Preference.General.Locale" xml:space="preserve">Sprache</x:String>
  <x:String x:Key="Text.Preference.General.MaxHistoryCommits" xml:space="preserve">Commit-Historie</x:String>
--- a/src/Resources/Locales/en_US.axaml
+++ b/src/Resources/Locales/en_US.axaml
@ -380,7 +380,6 @@
  <x:String x:Key="Text.Preference.Appearance.Theme" xml:space="preserve">Theme</x:String>
  <x:String x:Key="Text.Preference.Appearance.ThemeOverrides" xml:space="preserve">Theme Overrides</x:String>
  <x:String x:Key="Text.Preference.General" xml:space="preserve">GENERAL</x:String>
-  <x:String x:Key="Text.Preference.General.AvatarServer" xml:space="preserve">Avatar Server</x:String>
  <x:String x:Key="Text.Preference.General.Check4UpdatesOnStartup" xml:space="preserve">Check for updates on startup</x:String>
  <x:String x:Key="Text.Preference.General.Locale" xml:space="preserve">Language</x:String>
  <x:String x:Key="Text.Preference.General.MaxHistoryCommits" xml:space="preserve">History Commits</x:String>
--- a/src/Resources/Locales/pt_BR.axaml
+++ b/src/Resources/Locales/pt_BR.axaml
@ -383,7 +383,6 @@
  <x:String x:Key="Text.Preference.Appearance.Theme" xml:space="preserve">Tema</x:String>
  <x:String x:Key="Text.Preference.Appearance.ThemeOverrides" xml:space="preserve">Sobrescrever Tema</x:String>
  <x:String x:Key="Text.Preference.General" xml:space="preserve">GERAL</x:String>
-  <x:String x:Key="Text.Preference.General.AvatarServer" xml:space="preserve">Servidor de Avatar</x:String>
  <x:String x:Key="Text.Preference.General.Check4UpdatesOnStartup" xml:space="preserve">Verificar atualizações na inicialização</x:String>
  <x:String x:Key="Text.Preference.General.Locale" xml:space="preserve">Idioma</x:String>
  <x:String x:Key="Text.Preference.General.MaxHistoryCommits" xml:space="preserve">Commits do Histórico</x:String>
--- a/src/Resources/Locales/zh_CN.axaml
+++ b/src/Resources/Locales/zh_CN.axaml
@ -383,7 +383,6 @@
  <x:String x:Key="Text.Preference.Appearance.Theme" xml:space="preserve">主题</x:String>
  <x:String x:Key="Text.Preference.Appearance.ThemeOverrides" xml:space="preserve">主题自定义</x:String>
  <x:String x:Key="Text.Preference.General" xml:space="preserve">通用配置</x:String>
-  <x:String x:Key="Text.Preference.General.AvatarServer" xml:space="preserve">头像服务</x:String>
  <x:String x:Key="Text.Preference.General.Check4UpdatesOnStartup" xml:space="preserve">启动时检测软件更新</x:String>
  <x:String x:Key="Text.Preference.General.Locale" xml:space="preserve">显示语言</x:String>
  <x:String x:Key="Text.Preference.General.MaxHistoryCommits" xml:space="preserve">最大历史提交数</x:String>
--- a/src/Resources/Locales/zh_TW.axaml
+++ b/src/Resources/Locales/zh_TW.axaml
@ -383,7 +383,6 @@
  <x:String x:Key="Text.Preference.Appearance.Theme" xml:space="preserve">主題</x:String>
  <x:String x:Key="Text.Preference.Appearance.ThemeOverrides" xml:space="preserve">主題自訂</x:String>
  <x:String x:Key="Text.Preference.General" xml:space="preserve">通用配置</x:String>
-  <x:String x:Key="Text.Preference.General.AvatarServer" xml:space="preserve">頭像服務</x:String>
  <x:String x:Key="Text.Preference.General.Check4UpdatesOnStartup" xml:space="preserve">啟動時檢測軟體更新</x:String>
  <x:String x:Key="Text.Preference.General.Locale" xml:space="preserve">顯示語言</x:String>
  <x:String x:Key="Text.Preference.General.MaxHistoryCommits" xml:space="preserve">最大歷史提交數</x:String>
--- a/src/ViewModels/Launcher.cs
+++ b/src/ViewModels/Launcher.cs
@ -141,7 +141,7 @@ namespace SourceGit.ViewModels
                var last = Pages[0];
                if (last.Data is Repository repo)
                {
-                    Commands.AutoFetch.RemoveRepository(repo.FullPath);
+                    Models.AutoFetchManager.Instance.RemoveRepository(repo.FullPath);
                    repo.Close();

                    last.Node = new RepositoryNode() { Id = Guid.NewGuid().ToString() };
@ -245,7 +245,7 @@ namespace SourceGit.ViewModels
            };

            repo.Open();
-            Commands.AutoFetch.AddRepository(repo.FullPath);
+            Models.AutoFetchManager.Instance.AddRepository(repo.FullPath);

            if (page == null)
            {
@ -371,7 +371,7 @@ namespace SourceGit.ViewModels
        {
            if (page.Data is Repository repo)
            {
-                Commands.AutoFetch.RemoveRepository(repo.FullPath);
+                Models.AutoFetchManager.Instance.RemoveRepository(repo.FullPath);
                repo.Close();
            }

--- a/src/ViewModels/Preference.cs
+++ b/src/ViewModels/Preference.cs
@ -128,19 +128,6 @@ namespace SourceGit.ViewModels
            set => SetProperty(ref _layout, value);
        }

-        public string AvatarServer
-        {
-            get => Models.AvatarManager.SelectedServer;
-            set
-            {
-                if (Models.AvatarManager.SelectedServer != value)
-                {
-                    Models.AvatarManager.SelectedServer = value;
-                    OnPropertyChanged();
-                }
-            }
-        }
-
        public int MaxHistoryCommits
        {
            get => _maxHistoryCommits;
@ -262,11 +249,9 @@ namespace SourceGit.ViewModels
            set
            {
                if (Native.OS.SetShell(value))
-                {
                    OnPropertyChanged();
            }
        }
-        }

        public string GitDefaultCloneDir
        {
@ -276,12 +261,12 @@ namespace SourceGit.ViewModels

        public bool GitAutoFetch
        {
-            get => Commands.AutoFetch.IsEnabled;
+            get => Models.AutoFetchManager.Instance.IsEnabled;
            set
            {
-                if (Commands.AutoFetch.IsEnabled != value)
+                if (Models.AutoFetchManager.Instance.IsEnabled != value)
                {
-                    Commands.AutoFetch.IsEnabled = value;
+                    Models.AutoFetchManager.Instance.IsEnabled = value;
                    OnPropertyChanged();
                }
            }
@ -289,15 +274,15 @@ namespace SourceGit.ViewModels

        public int? GitAutoFetchInterval
        {
-            get => Commands.AutoFetch.Interval;
+            get => Models.AutoFetchManager.Instance.Interval;
            set
            {
-                if (value is null or < 1)
+                if (value is null || value < 1)
                    return;
                
-                if (Commands.AutoFetch.Interval != value)
+                if (Models.AutoFetchManager.Instance.Interval != value)
                {
-                    Commands.AutoFetch.Interval = (int)value;
+                    Models.AutoFetchManager.Instance.Interval = (int)value;
                    OnPropertyChanged();
                }
            }
@ -336,7 +321,7 @@ namespace SourceGit.ViewModels
        {
            get;
            set;
-        } = new List<string>();
+        } = [];

        public int LastActiveTabIdx
        {
--- a/src/Views/Avatar.cs
+++ b/src/Views/Avatar.cs
@ -39,7 +39,7 @@ namespace SourceGit.Views
            refetch.Click += (_, _) =>
            {
                if (User != null)
-                    Models.AvatarManager.Request(User.Email, true);
+                    Models.AvatarManager.Instance.Request(User.Email, true);
            };

            ContextMenu = new ContextMenu();
@ -54,7 +54,7 @@ namespace SourceGit.Views
                return;

            var corner = (float)Math.Max(2, Bounds.Width / 16);
-            var img = Models.AvatarManager.Request(User.Email, false);
+            var img = Models.AvatarManager.Instance.Request(User.Email, false);
            if (img != null)
            {
                var rect = new Rect(0, 0, Bounds.Width, Bounds.Height);
@ -72,21 +72,19 @@ namespace SourceGit.Views
        public void OnAvatarResourceChanged(string email)
        {
            if (User.Email.Equals(email, StringComparison.Ordinal))
-            {
                InvalidateVisual();
        }
-        }

        protected override void OnLoaded(RoutedEventArgs e)
        {
            base.OnLoaded(e);
-            Models.AvatarManager.Subscribe(this);
+            Models.AvatarManager.Instance.Subscribe(this);
        }

        protected override void OnUnloaded(RoutedEventArgs e)
        {
            base.OnUnloaded(e);
-            Models.AvatarManager.Unsubscribe(this);
+            Models.AvatarManager.Instance.Unsubscribe(this);
        }

        private static void OnUserPropertyChanged(Avatar avatar, AvaloniaPropertyChangedEventArgs e)
--- a/src/Views/Preference.axaml
+++ b/src/Views/Preference.axaml
@ -57,7 +57,7 @@
          <TabItem.Header>
            <TextBlock Classes="tab_header" Text="{DynamicResource Text.Preference.General}"/>
          </TabItem.Header>
-          <Grid Margin="8" RowDefinitions="32,32,32,32,32,32,32,32" ColumnDefinitions="Auto,*">
+          <Grid Margin="8" RowDefinitions="32,32,32,32,32,32,32" ColumnDefinitions="Auto,*">
            <TextBlock Grid.Row="0" Grid.Column="0"
                       Text="{DynamicResource Text.Preference.General.Locale}"
                       HorizontalAlignment="Right"
@ -71,25 +71,10 @@
                      SelectedItem="{Binding Locale, Mode=TwoWay, Converter={x:Static c:StringConverters.ToLocale}}"/>

            <TextBlock Grid.Row="1" Grid.Column="0"
-                       Text="{DynamicResource Text.Preference.General.AvatarServer}"
-                       HorizontalAlignment="Right"
-                       Margin="0,0,16,0"/>
-            <ComboBox Grid.Row="1" Grid.Column="1"
-                      MinHeight="28"
-                      Padding="8,0"
-                      HorizontalAlignment="Stretch"
-                      SelectedItem="{Binding AvatarServer, Mode=TwoWay}">
-              <ComboBox.Items>
-                <sys:String>https://www.gravatar.com/avatar/</sys:String>
-                <sys:String>https://cravatar.cn/avatar/</sys:String>
-              </ComboBox.Items>
-            </ComboBox>
-
-            <TextBlock Grid.Row="2" Grid.Column="0"
                       Text="{DynamicResource Text.Preference.General.VisibleDiffContextLines}"
                       HorizontalAlignment="Right"
                       Margin="0,0,16,0"/>
-            <NumericUpDown Grid.Row="2" Grid.Column="1"
+            <NumericUpDown Grid.Row="1" Grid.Column="1"
                           Minimum="4" Maximum="10000" Increment="1"
                           Height="28"
                           Padding="4"
@ -98,11 +83,11 @@
                           CornerRadius="3"
                           Value="{Binding DiffViewVisualLineNumbers, Mode=TwoWay}"/>

-            <TextBlock Grid.Row="3" Grid.Column="0"
+            <TextBlock Grid.Row="2" Grid.Column="0"
                       Text="{DynamicResource Text.Preference.General.SubjectGuideLength}"
                       HorizontalAlignment="Right"
                       Margin="0,0,16,0"/>
-            <NumericUpDown Grid.Row="3" Grid.Column="1"
+            <NumericUpDown Grid.Row="2" Grid.Column="1"
                           Minimum="50" Maximum="1000" Increment="1"
                           Height="28"
                           Padding="4"
@ -111,11 +96,11 @@
                           CornerRadius="3"
                           Value="{Binding SubjectGuideLength, Mode=TwoWay}"/>

-            <TextBlock Grid.Row="4" Grid.Column="0"
+            <TextBlock Grid.Row="3" Grid.Column="0"
                       Text="{DynamicResource Text.Preference.General.MaxHistoryCommits}"
                       HorizontalAlignment="Right"
                       Margin="0,0,16,0"/>
-            <Grid Grid.Row="4" Grid.Column="1" ColumnDefinitions="*,64">
+            <Grid Grid.Row="3" Grid.Column="1" ColumnDefinitions="*,64">
              <Slider Grid.Column="0"
                      Minimum="20000" Maximum="100000"
                      TickPlacement="BottomRight" TickFrequency="5000"
@ -130,16 +115,16 @@
                         Text="{Binding MaxHistoryCommits}"/>
            </Grid>

-            <CheckBox Grid.Row="5" Grid.Column="1"
+            <CheckBox Grid.Row="4" Grid.Column="1"
                      Content="{DynamicResource Text.Preference.General.RestoreTabs}"
                      IsChecked="{Binding RestoreTabs, Mode=TwoWay}"/>

-            <CheckBox Grid.Row="6" Grid.Column="1"
+            <CheckBox Grid.Row="5" Grid.Column="1"
                      Height="32"
                      Content="{DynamicResource Text.Preference.General.UseFixedTabWidth}"
                      IsChecked="{Binding Source={x:Static vm:Preference.Instance}, Path=UseFixedTabWidth, Mode=TwoWay}"/>

-            <CheckBox Grid.Row="7" Grid.Column="1"
+            <CheckBox Grid.Row="6" Grid.Column="1"
                      Height="32"
                      Content="{DynamicResource Text.Preference.General.Check4UpdatesOnStartup}"
                      IsChecked="{Binding Source={x:Static vm:Preference.Instance}, Path=Check4UpdatesOnStartup, Mode=TwoWay}"/>