Theme aware plugin (#4499)

* Migrate theme manager to infrastructure and added it as input to public API instance

* Working event-delegate for PublicAPIInstance

* Theme aware UWP applications

* Theme aware program plugin

* Update query icon on theme change

* Theme aware calculator plugin

* Fix issue with query running before theme change

* Theme based changes in ImageLoader

* Removed ErrorIcon direct references and added references from ImageLoader

* Nit fixes

* Removed unnecessary TODO in UWP.cs

* Added preference to theme based icons

* Added IDisposable interfaces to unsubscribe events

src/modules/launcher/Plugins/Microsoft.Plugin.Calculator/Main.cs

@@ -1,4 +1,6 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
+using System.Drawing;
 using System.Runtime.InteropServices;
 using System.Text.RegularExpressions;
 using System.Threading;
@@ -8,7 +10,7 @@ using Wox.Plugin;
 
 namespace Microsoft.Plugin.Calculator
 {
-    public class Main : IPlugin, IPluginI18n
+    public class Main : IPlugin, IPluginI18n, IDisposable
     {
         private static readonly Regex RegValidExpressChar = new Regex(
                         @"^(" +
@@ -22,6 +24,8 @@ namespace Microsoft.Plugin.Calculator
         private static readonly Regex RegBrackets = new Regex(@"[\(\)\[\]]", RegexOptions.Compiled);
         private static readonly Engine MagesEngine;
         private PluginInitContext Context { get; set; }
+        private string IconPath { get; set; }
+        private bool _disposed = false;
 
         static Main()
         {
@@ -58,7 +62,7 @@ namespace Microsoft.Plugin.Calculator
                         new Result
                         {
                             Title = result.ToString(),
-                            IcoPath = "Images/calculator.png",
+                            IcoPath = IconPath,
                             Score = 300,
                             SubTitle = Context.API.GetTranslation("wox_plugin_calculator_copy_number_to_clipboard"),
                             Action = c =>
@@ -115,6 +119,26 @@ namespace Microsoft.Plugin.Calculator
         public void Init(PluginInitContext context)
         {
             Context = context;
+            Context.API.ThemeChanged += OnThemeChanged;
+            UpdateIconPath(Context.API.GetCurrentTheme());
+        }
+
+        // Todo : Update with theme based IconPath
+        private void UpdateIconPath(Theme theme)
+        {
+            if (theme == Theme.Light || theme == Theme.HighContrastWhite)
+            {
+                IconPath = "Images/calculator_light.png";
+            }
+            else
+            {
+                IconPath = "Images/calculator_dark.png";
+            }
+        }
+
+        private void OnThemeChanged(Theme _, Theme newTheme)
+        {
+            UpdateIconPath(newTheme);
         }
 
         public string GetTranslatedPluginTitle()
@@ -126,5 +150,23 @@ namespace Microsoft.Plugin.Calculator
         {
             return Context.API.GetTranslation("wox_plugin_calculator_plugin_description");
         }
+
+        public void Dispose()
+        {
+            Dispose(disposing: true);
+            GC.SuppressFinalize(this);
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (!_disposed)
+            {
+                if (disposing)
+                {
+                    Context.API.ThemeChanged -= OnThemeChanged;
+                    _disposed = true;
+                }
+            }
+        }
     }
 }

src/modules/launcher/Plugins/Microsoft.Plugin.Calculator/Microsoft.Plugin.Calculator.csproj

@@ -49,7 +49,7 @@
   </ItemGroup>
   
   <ItemGroup>
-    <None Include="Images\calculator.png">
+    <None Include="Images\calculator_light.png">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </None>
   </ItemGroup>
@@ -107,5 +107,11 @@
     <PackageReference Include="Mages" Version="1.6.0" />
     <PackageReference Include="System.Runtime" Version="4.3.1" />
   </ItemGroup>
+  
+  <ItemGroup>
+    <None Update="Images\calculator_dark.png">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
 
 </Project>

src/modules/launcher/Plugins/Microsoft.Plugin.Program/Main.cs

@@ -13,11 +13,11 @@ using Wox.Plugin;
 using Microsoft.Plugin.Program.Views;
 
 using Stopwatch = Wox.Infrastructure.Stopwatch;
-
+using Microsoft.Plugin.Program.Programs;
 
 namespace Microsoft.Plugin.Program
 {
-    public class Main : ISettingProvider, IPlugin, IPluginI18n, IContextMenu, ISavable, IReloadable
+    public class Main : ISettingProvider, IPlugin, IPluginI18n, IContextMenu, ISavable, IReloadable, IDisposable
     {
         private static readonly object IndexLock = new object();
         internal static Programs.Win32[] _win32s { get; set; }
@@ -34,6 +34,7 @@ namespace Microsoft.Plugin.Program
         private static BinaryStorage<Programs.Win32[]> _win32Storage;
         private static BinaryStorage<Programs.UWP.Application[]> _uwpStorage;
         private readonly PluginJsonStorage<Settings> _settingsStorage;
+        private bool _disposed = false;
 
         public Main()
         {
@@ -104,6 +105,21 @@ namespace Microsoft.Plugin.Program
         public void Init(PluginInitContext context)
         {
             _context = context;
+            _context.API.ThemeChanged += OnThemeChanged;
+            UpdateUWPIconPath(_context.API.GetCurrentTheme());
+        }
+
+        public void OnThemeChanged(Theme _, Theme currentTheme)
+        {
+            UpdateUWPIconPath(currentTheme);
+        }
+
+        public void UpdateUWPIconPath(Theme theme)
+        {
+            foreach (UWP.Application app in _uwps)
+            {
+                app.UpdatePath(theme);
+            }
         }
 
         public static void IndexWin32Programs()
@@ -186,6 +202,25 @@ namespace Microsoft.Plugin.Program
         public void UpdateSettings(PowerLauncherSettings settings)
         {
         }
+
+        public void Dispose()
+        {
+            Dispose(disposing: true);
+            GC.SuppressFinalize(this);
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (!_disposed)
+            {
+                if (disposing)
+                {
+                    _context.API.ThemeChanged -= OnThemeChanged;
+                    _disposed = true;
+                }
+            }
+        }
+
         void InitializeFileWatchers()
         {
             // Create a new FileSystemWatcher and set its properties.

src/modules/launcher/Plugins/Microsoft.Plugin.Program/Programs/UWP.cs

@@ -21,6 +21,7 @@ using System.Windows.Input;
 using System.Runtime.InteropServices.ComTypes;
 using Wox.Plugin.SharedCommands;
 using System.Reflection;
+using Wox.Infrastructure.Image;
 
 namespace Microsoft.Plugin.Program.Programs
 {
@@ -404,7 +405,6 @@ namespace Microsoft.Plugin.Program.Programs
                 DisplayName = ResourceFromPri(package.FullName, DisplayName);
                 Description = ResourceFromPri(package.FullName, Description);
                 LogoUri = LogoUriFromManifest(manifestApp);
-                LogoPath = LogoPathFromUri(LogoUri);
 
                 Enabled = true;
                 CanRunElevated = IfApplicationcanRunElevated();
@@ -516,7 +516,19 @@ namespace Microsoft.Plugin.Program.Programs
                 }
             }
 
-            internal string LogoPathFromUri(string uri)
+            public void UpdatePath(Theme theme)
+            {
+                if (theme == Theme.Light || theme == Theme.HighContrastWhite)
+                {
+                    LogoPath = LogoPathFromUri(LogoUri, "contrast-white");
+                }
+                else
+                {
+                    LogoPath = LogoPathFromUri(LogoUri, "contrast-black");
+                }
+            }
+
+            internal string LogoPathFromUri(string uri, string theme)
             {
                 // all https://msdn.microsoft.com/windows/uwp/controls-and-patterns/tiles-and-notifications-app-assets
                 // windows 10 https://msdn.microsoft.com/en-us/library/windows/apps/dn934817.aspx
@@ -539,11 +551,7 @@ namespace Microsoft.Plugin.Program.Programs
                 {
                     var end = path.Length - extension.Length;
                     var prefix = path.Substring(0, end);
-                    var paths = new List<string> { path };
+                    var paths = new List<string> { path };                    
-
-                    // TODO: This value must be set in accordance to the WPF theme (work in progress).
-                    // Must be set to `contrast-white` for light theme and to `contrast-black` for dark theme to get an icon of the contrasting color.
-                    var theme = "contrast-black";
 
                     var scaleFactors = new Dictionary<PackageVersion, List<int>>
                     {
@@ -563,6 +571,7 @@ namespace Microsoft.Plugin.Program.Programs
                         }
                     }
 
+                    paths = paths.OrderByDescending(x => x.Contains(theme)).ToList();
                     var selected = paths.FirstOrDefault(File.Exists);
                     if (!string.IsNullOrEmpty(selected))
                     {
@@ -589,6 +598,7 @@ namespace Microsoft.Plugin.Program.Programs
                             pathFactorPairs.Add(prefixThemePath, factor);
                         }
 
+                        paths = paths.OrderByDescending(x => x.Contains(theme)).ToList();
                         var selectedIconPath = paths.OrderBy(x => Math.Abs(pathFactorPairs.GetValueOrDefault(x) - appIconSize)).FirstOrDefault(File.Exists);
                         if (!string.IsNullOrEmpty(selectedIconPath))
                         {
@@ -630,7 +640,7 @@ namespace Microsoft.Plugin.Program.Programs
                     ProgramLogger.LogException($"|UWP|ImageFromPath|{path}" +
                                                     $"|Unable to get logo for {UserModelId} from {path} and" +
                                                     $" located in {Package.Location}", new FileNotFoundException());
-                    return new BitmapImage(new Uri(Constant.ErrorIcon));
+                    return new BitmapImage(new Uri(ImageLoader.ErrorIconPath));
                 }
             }
 

src/modules/launcher/PowerLauncher/App.xaml.cs

@@ -17,6 +17,7 @@ using Wox.Infrastructure.Http;
 using Wox.Infrastructure.Image;
 using Wox.Infrastructure.Logger;
 using Wox.Infrastructure.UserSettings;
+using Wox.Plugin;
 using Wox.ViewModel;
 using Stopwatch = Wox.Infrastructure.Stopwatch;
 
@@ -31,6 +32,7 @@ namespace PowerLauncher
         private Settings _settings;
         private MainViewModel _mainVM;
         private MainWindow _mainWindow;
+        private ThemeManager _themeManager;
         private SettingWindowViewModel _settingsVM;
         private readonly Alphabet _alphabet = new Alphabet();
         private StringMatcher _stringMatcher;
@@ -70,7 +72,8 @@ namespace PowerLauncher
                 RegisterAppDomainExceptions();
                 RegisterDispatcherUnhandledException();
 
-                ImageLoader.Initialize();
+                _themeManager = new ThemeManager(this);
+                ImageLoader.Initialize(_themeManager.GetCurrentTheme());
 
                 _settingsVM = new SettingWindowViewModel();
                 _settings = _settingsVM.Settings;
@@ -80,11 +83,10 @@ namespace PowerLauncher
                 StringMatcher.Instance = _stringMatcher;
                 _stringMatcher.UserSettingSearchPrecision = _settings.QuerySearchPrecision;
 
-                ThemeManager themeManager = new ThemeManager(this);               
                 PluginManager.LoadPlugins(_settings.PluginSettings);
                 _mainVM = new MainViewModel(_settings);
                 _mainWindow = new MainWindow(_settings, _mainVM);
-                API = new PublicAPIInstance(_settingsVM, _mainVM, _alphabet);
+                API = new PublicAPIInstance(_settingsVM, _mainVM, _alphabet, _themeManager);
                 PluginManager.InitializePlugins(API);
 
                 Current.MainWindow = _mainWindow;
@@ -105,6 +107,7 @@ namespace PowerLauncher
                 
                 _mainVM.MainWindowVisibility = Visibility.Visible;
                 _mainVM.ColdStartFix();
+                _themeManager.ThemeChanged += OnThemeChanged;
                 Log.Info("|App.OnStartup|End PowerToys Run startup ----------------------------------------------------  ");
 
                 bootTime.Stop();
@@ -125,6 +128,17 @@ namespace PowerLauncher
             Current.SessionEnding += (s, e) => Dispose();
         }
 
+        /// <summary>
+        /// Callback when windows theme is changed.
+        /// </summary>
+        /// <param name="oldTheme">Previous Theme</param>
+        /// <param name="newTheme">Current Theme</param>
+        private void OnThemeChanged(Theme oldTheme, Theme newTheme)
+        {
+            ImageLoader.UpdateIconPath(newTheme);
+            _mainVM.Query();
+        }
+
         /// <summary>
         /// let exception throw as normal is better for Debug
         /// </summary>
@@ -158,9 +172,13 @@ namespace PowerLauncher
                     Log.Info("|App.OnExit| Start PowerToys Run Exit----------------------------------------------------  ");
                     if (disposing)
                     {
-                        _mainWindow.Dispose();
+                        _themeManager.ThemeChanged -= OnThemeChanged;
                         API.SaveAppAllSettings();
+                        PluginManager.Dispose();
+                        _mainWindow.Dispose();
+                        API.Dispose();
                         _mainVM.Dispose();
+                        _themeManager.Dispose();
                         _disposed = true;
                     }
 

src/modules/launcher/Wox.Core/Plugin/PluginManager.cs

@@ -287,5 +287,14 @@ namespace Wox.Core.Plugin
                 RemoveActionKeyword(id, oldActionKeyword);
             }
         }
+
+        public static void Dispose()
+        {
+            foreach (var plugin in AllPlugins)
+            {
+                var disposablePlugin = plugin as IDisposable;
+                disposablePlugin?.Dispose();
+            }
+        }
     }
 }

src/modules/launcher/Wox.Core/Wox.Core.csproj

@@ -57,7 +57,6 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
     <PackageReference Include="JetBrains.Annotations" Version="2020.1.0" />
-    <PackageReference Include="MahApps.Metro" Version="2.0.0" />
     <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
     <PackageReference Include="PropertyChanged.Fody" Version="3.2.8" />
     <PackageReference Include="SharpZipLib" Version="1.2.0" />

src/modules/launcher/Wox.Infrastructure/Image/ImageLoader.cs

@@ -8,6 +8,7 @@ using System.Windows.Media;
 using System.Windows.Media.Imaging;
 using Wox.Infrastructure.Logger;
 using Wox.Infrastructure.Storage;
+using Wox.Plugin;
 
 namespace Wox.Infrastructure.Image
 {
@@ -17,7 +18,8 @@ namespace Wox.Infrastructure.Image
         private static BinaryStorage<Dictionary<string, int>> _storage;
         private static readonly ConcurrentDictionary<string, string> GuidToKey = new ConcurrentDictionary<string, string>();
         private static IImageHashGenerator _hashGenerator;
-
+        public static string ErrorIconPath;
+        public static string DefaultIconPath;
 
         private static readonly string[] ImageExtensions =
         {
@@ -31,18 +33,20 @@ namespace Wox.Infrastructure.Image
         };
 
 
-        public static void Initialize()
+        public static void Initialize(Theme theme)
         {
             _storage = new BinaryStorage<Dictionary<string, int>>("Image");
             _hashGenerator = new ImageHashGenerator();
             ImageCache.SetUsageAsDictionary(_storage.TryLoad(new Dictionary<string, int>()));
 
+            // Todo : Add error and default icon specific to each theme
             foreach (var icon in new[] { Constant.DefaultIcon, Constant.ErrorIcon })
             {
                 ImageSource img = new BitmapImage(new Uri(icon));
                 img.Freeze();
                 ImageCache[icon] = img;
             }
+            UpdateIconPath(theme);
             Task.Run(() =>
             {
                 Stopwatch.Normal("|ImageLoader.Initialize|Preload images cost", () =>
@@ -62,6 +66,21 @@ namespace Wox.Infrastructure.Image
             _storage.Save(ImageCache.GetUsageAsDictionary());
         }
 
+        //Todo : Update it with icons specific to each theme.
+        public static void UpdateIconPath(Theme theme)
+        {
+            if (theme == Theme.Light || theme == Theme.HighContrastWhite)
+            {
+                ErrorIconPath = Constant.ErrorIcon;
+                DefaultIconPath = Constant.DefaultIcon;
+            }
+            else
+            {
+                ErrorIconPath = Constant.ErrorIcon;
+                DefaultIconPath = Constant.DefaultIcon;
+            }
+        }
+
         private class ImageResult
         {
             public ImageResult(ImageSource imageSource, ImageType imageType)
@@ -92,7 +111,7 @@ namespace Wox.Infrastructure.Image
             {
                 if (string.IsNullOrEmpty(path))
                 {
-                    return new ImageResult(ImageCache[Constant.ErrorIcon], ImageType.Error);
+                    return new ImageResult(ImageCache[ErrorIconPath], ImageType.Error);
                 }
                 if (ImageCache.ContainsKey(path))
                 {
@@ -154,8 +173,8 @@ namespace Wox.Infrastructure.Image
                 }
                 else
                 {
-                    image = ImageCache[Constant.ErrorIcon];
+                    image = ImageCache[ErrorIconPath];
-                    path = Constant.ErrorIcon;
+                    path = ErrorIconPath;
                 }
 
                 if (type != ImageType.Error)
@@ -167,7 +186,7 @@ namespace Wox.Infrastructure.Image
             {
                 Log.Exception($"|ImageLoader.Load|Failed to get thumbnail for {path}", e);
                 type = ImageType.Error;
-                image = ImageCache[Constant.ErrorIcon];
+                image = ImageCache[ErrorIconPath];
                 ImageCache[path] = image;
             }
             return new ImageResult(image, type);

src/modules/launcher/Wox.Plugin/IPublicAPI.cs

@@ -57,6 +57,16 @@ namespace Wox.Plugin
         [Obsolete]
         void ShowApp();
 
+        /// <summary>
+        /// Get current theme
+        /// </summary>
+        Theme GetCurrentTheme();
+
+        /// <summary>
+        /// Theme change event
+        /// </summary>
+        event ThemeChangedHandler ThemeChanged;
+
         /// <summary>
         /// Save all Wox settings
         /// </summary>

src/modules/launcher/Wox.Plugin/ThemeManager.cs

@@ -6,12 +6,13 @@ using System.Diagnostics;
 using System.Linq;
 using System.Windows;
 
-namespace Wox.Core.Resource
+namespace Wox.Plugin
 {
-    public class ThemeManager
+    public class ThemeManager : IDisposable
     {
         private Theme currentTheme;
         private readonly Application App;
+        private bool _disposed = false;
         private readonly string LightTheme = "Light.Accent1";
         private readonly string DarkTheme = "Dark.Accent1";
         private readonly string HighContrastOneTheme = "HighContrast.Accent2";
@@ -19,6 +20,8 @@ namespace Wox.Core.Resource
         private readonly string HighContrastBlackTheme = "HighContrast.Accent4";
         private readonly string HighContrastWhiteTheme = "HighContrast.Accent5";
 
+        public event ThemeChangedHandler ThemeChanged;
+
         public ThemeManager(Application app)
         {
             this.App = app;
@@ -52,17 +55,23 @@ namespace Wox.Core.Resource
             ResetTheme();
             ControlzEx.Theming.ThemeManager.Current.ThemeSyncMode = ThemeSyncMode.SyncWithAppMode;
             ControlzEx.Theming.ThemeManager.Current.ThemeChanged += Current_ThemeChanged;
-            SystemParameters.StaticPropertyChanged += (sender, args) =>
+            SystemParameters.StaticPropertyChanged += SystemParameters_StaticPropertyChanged;
+        }
+
+        private void SystemParameters_StaticPropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
+        {
+            if (e.PropertyName == nameof(SystemParameters.HighContrast))
             {
-                if (args.PropertyName == nameof(SystemParameters.HighContrast))
+                ResetTheme();
-                {
+            }
-                    ResetTheme();
+        }
-                }
+
-            };
+        public Theme GetCurrentTheme()
+        {
+            return currentTheme;
         }
         
-
+        private static Theme GetHighContrastBaseType()
-        public static Theme GetHighContrastBaseType()
         {
             string RegistryKey = @"HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Themes";
             string theme = (string) Registry.GetValue(RegistryKey, "CurrentTheme", string.Empty);
@@ -80,7 +89,7 @@ namespace Wox.Core.Resource
                 return Theme.None;
         }
 
-        public void ResetTheme()
+        private void ResetTheme()
         {
             if (SystemParameters.HighContrast)
             {
@@ -96,6 +105,7 @@ namespace Wox.Core.Resource
 
         private void ChangeTheme(Theme theme)
         {
+            Theme oldTheme = currentTheme;
             if (theme == currentTheme)
                 return;
             if (theme == Theme.HighContrastOne)
@@ -132,15 +142,36 @@ namespace Wox.Core.Resource
             {
                 currentTheme = Theme.None;
             }
-            Debug.WriteLine("Theme Changed to :" + currentTheme);
+            ThemeChanged?.Invoke(oldTheme, currentTheme);
         }
 
         private void Current_ThemeChanged(object sender, ThemeChangedEventArgs e)
         {
             ResetTheme();
         }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (!_disposed)
+            {            
+                if (disposing)
+                {
+                    ControlzEx.Theming.ThemeManager.Current.ThemeChanged -= Current_ThemeChanged;
+                    SystemParameters.StaticPropertyChanged -= SystemParameters_StaticPropertyChanged;
+                    _disposed = true;
+                }               
+            }
+        }
+
+        public void Dispose()
+        {
+            Dispose(disposing: true);
+            GC.SuppressFinalize(this);
+        }
     }
 
+    public delegate void ThemeChangedHandler(Theme oldTheme, Theme newTheme);
+
     public enum Theme
     {
         None,

src/modules/launcher/Wox.Plugin/Wox.Plugin.csproj

@@ -57,6 +57,8 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
     <PackageReference Include="JetBrains.Annotations" Version="2020.1.0" />
+    <PackageReference Include="MahApps.Metro" Version="2.1.0" />
+    <PackageReference Include="ControlzEx" Version="4.3.0" />
     <PackageReference Include="Mono.Cecil" Version="0.11.2" />
     <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
     <PackageReference Include="PropertyChanged.Fody" Version="3.2.8" />

src/modules/launcher/Wox/PublicAPIInstance.cs

@@ -14,19 +14,25 @@ using Wox.ViewModel;
 
 namespace Wox
 {
-    public class PublicAPIInstance : IPublicAPI
+    public class PublicAPIInstance : IPublicAPI, IDisposable
     {
         private readonly SettingWindowViewModel _settingsVM;
         private readonly MainViewModel _mainVM;
         private readonly Alphabet _alphabet;
+        private bool _disposed = false;
+        private readonly ThemeManager _themeManager;
+
+        public event ThemeChangedHandler ThemeChanged;
 
         #region Constructor
 
-        public PublicAPIInstance(SettingWindowViewModel settingsVM, MainViewModel mainVM, Alphabet alphabet)
+        public PublicAPIInstance(SettingWindowViewModel settingsVM, MainViewModel mainVM, Alphabet alphabet, ThemeManager themeManager)
         {
             _settingsVM = settingsVM;
             _mainVM = mainVM;
             _alphabet = alphabet;
+            _themeManager = themeManager;
+            _themeManager.ThemeChanged += OnThemeChanged;
             WebRequest.RegisterPrefix("data", new DataWebRequestFactory());
         }
 
@@ -138,10 +144,37 @@ namespace Wox
             });
         }
 
+        public Theme GetCurrentTheme()
+        {
+            return _themeManager.GetCurrentTheme();
+        }
+
+        public void Dispose()
+        {
+            Dispose(disposing: true);
+            GC.SuppressFinalize(this);
+        }
+
         #endregion
 
-        #region Private Methods
+        #region Protected Methods
 
+        protected void OnThemeChanged(Theme oldTheme, Theme newTheme)
+        {
+            ThemeChanged?.Invoke(oldTheme, newTheme);
+        }
+   
+        protected virtual void Dispose(bool disposing)
+        {
+            if (!_disposed)
+            {            
+                if (disposing)
+                {
+                    _themeManager.ThemeChanged -= OnThemeChanged;
+                    _disposed = true;
+                }               
+            }
+        }
         #endregion
     }
 }

src/modules/launcher/Wox/ViewModel/ResultViewModel.cs

@@ -172,7 +172,7 @@ namespace Wox.ViewModel
                     catch (Exception e)
                     {
                         Log.Exception($"|ResultViewModel.Image|IcoPath is empty and exception when calling Icon() for result <{Result.Title}> of plugin <{Result.PluginDirectory}>", e);
-                        imagePath = Constant.ErrorIcon;
+                        imagePath = ImageLoader.ErrorIconPath;
                     }
                 }