feat: changable System Menu Theme

build/MicaSetup/Design/Controls/Window/WindowBackdrop.cs

@@ -93,7 +93,6 @@ public static bool ApplyBackdrop(nint hWnd, WindowBackdropType backdropType = Wi
                 break;
 
             case ApplicationTheme.Light:
-            case ApplicationTheme.HighContrast:
                 WindowDarkMode.RemoveWindowDarkMode(hWnd);
                 break;
         }

build/MicaSetup/Design/Themes/SystemMenuThemeManager.cs

@@ -0,0 +1,82 @@
+using MicaSetup.Helper;
+using MicaSetup.Natives;
+using Microsoft.Win32;
+using System;
+
+namespace MicaSetup.Design.Themes;
+
+internal static class SystemMenuThemeManager
+{
+    public static void Apply(SystemMenuTheme theme = SystemMenuTheme.Auto)
+    {
+        // Enable dark mode for context menus if using dark theme
+        if (Environment.OSVersion.Version.Build >= 18362) // Windows 10 1903
+        {
+            if (theme == SystemMenuTheme.Auto)
+            {
+                // UxTheme methods will apply all of menus.
+                // However, the Windows style system prefers that
+                // Windows System Menu is based on `Apps Theme`,
+                // and Tray Context Menu is based on `System Theme` when using a custom theme.
+                // But actually we can't have our cake and eat it too.
+                // Finally, we synchronize the theme styles of tray with higher usage rates.
+                if (OSThemeHelper.SystemUsesDarkTheme())
+                {
+                    _ = UxTheme.SetPreferredAppMode(UxTheme.PreferredAppMode.ForceDark);
+                    UxTheme.FlushMenuThemes();
+                }
+
+                // Synchronize the theme with system settings
+                SystemEvents.UserPreferenceChanged -= OnUserPreferenceChangedEventHandler;
+                SystemEvents.UserPreferenceChanged += OnUserPreferenceChangedEventHandler;
+            }
+            else if (theme == SystemMenuTheme.Dark)
+            {
+                SystemEvents.UserPreferenceChanged -= OnUserPreferenceChangedEventHandler;
+                _ = UxTheme.SetPreferredAppMode(UxTheme.PreferredAppMode.ForceDark);
+                UxTheme.FlushMenuThemes();
+            }
+            else if (theme == SystemMenuTheme.Light)
+            {
+                SystemEvents.UserPreferenceChanged -= OnUserPreferenceChangedEventHandler;
+                _ = UxTheme.SetPreferredAppMode(UxTheme.PreferredAppMode.ForceLight);
+                UxTheme.FlushMenuThemes();
+            }
+        }
+    }
+
+    private static void OnUserPreferenceChangedEventHandler(object sender, UserPreferenceChangedEventArgs e)
+    {
+        if (OSThemeHelper.SystemUsesDarkTheme())
+        {
+            _ = UxTheme.SetPreferredAppMode(UxTheme.PreferredAppMode.ForceDark);
+            UxTheme.FlushMenuThemes();
+        }
+        else
+        {
+            _ = UxTheme.SetPreferredAppMode(UxTheme.PreferredAppMode.ForceLight);
+            UxTheme.FlushMenuThemes();
+        }
+    }
+}
+
+/// <summary>
+/// Theme in which an system menu is displayed.
+/// </summary>
+public enum SystemMenuTheme
+{
+    /// <summary>
+    /// Auto system theme.
+    /// </summary>
+    Auto = ApplicationTheme.Unknown,
+
+    /// <summary>
+    /// Dark system theme.
+    /// </summary>
+    Dark = ApplicationTheme.Dark,
+
+    /// <summary>
+    /// Light system theme.
+    /// </summary>
+    Light = ApplicationTheme.Light,
+}

build/MicaSetup/Design/Themes/ThemeService.cs

@@ -1,4 +1,5 @@
-using MicaSetup.Helper;
+using MicaSetup.Design.Themes;
+using MicaSetup.Helper;
 using MicaSetup.Natives;
 using System;
 using System.Windows;
@@ -59,12 +60,19 @@ private void SetWindowBackdrop(Window window, BackdropType micaType)
 
     private WindowsTheme GetTheme()
     {
-        return currentTheme == WindowsTheme.Auto ? WindowsThemeHelper.GetCurrentWindowsTheme() : currentTheme;
+        return currentTheme == WindowsTheme.Auto ? (OSThemeHelper.AppsUseDarkTheme() ? WindowsTheme.Dark : WindowsTheme.Light) : currentTheme;
     }
 
     public void SetTheme(WindowsTheme theme)
     {
         CurrentTheme = theme;
+
+        SystemMenuThemeManager.Apply(theme switch
+        {
+            WindowsTheme.Dark => SystemMenuTheme.Dark,
+            WindowsTheme.Light => SystemMenuTheme.Light,
+            WindowsTheme.Auto or _ => SystemMenuTheme.Auto,
+        });
         SyncThemeResource();
     }
 

build/MicaSetup/Helper/JsonHelper.cs

@@ -4,7 +4,7 @@
 
 namespace MicaSetup.Helper;
 
-internal static class JsonHelper
+public static class JsonHelper
 {
     public static string SerializeObject(IDictionary<string, dynamic?> obj)
     {

build/MicaSetup/Helper/OSThemeHelper.cs

@@ -0,0 +1,24 @@
+using Microsoft.Win32;
+
+namespace MicaSetup.Helper;
+
+public static class OSThemeHelper
+{
+    public static bool AppsUseDarkTheme()
+    {
+        object? value = Registry.GetValue(
+                            @"HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Themes\Personalize",
+                            "AppsUseLightTheme", 1);
+
+        return value != null && (int)value == 0;
+    }
+
+    public static bool SystemUsesDarkTheme()
+    {
+        object? value = Registry.GetValue(
+                            @"HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Themes\Personalize",
+                            "SystemUsesLightTheme", 0);
+
+        return value == null || (int)value == 0;
+    }
+}

build/MicaSetup/Natives/NativeEnums.cs

@@ -683,9 +683,4 @@ public enum ApplicationTheme
     /// Light application theme.
     /// </summary>
     Light,
-
-    /// <summary>
-    /// High contract application theme.
-    /// </summary>
-    HighContrast,
 }

build/MicaSetup/Natives/UxTheme.cs

@@ -5,6 +5,12 @@ namespace MicaSetup.Natives;
 
 public static class UxTheme
 {
+    [DllImport(Lib.UxTheme, EntryPoint = "#135", SetLastError = true, CharSet = CharSet.Unicode)]
+    public static extern int SetPreferredAppMode(PreferredAppMode preferredAppMode);
+
+    [DllImport(Lib.UxTheme, EntryPoint = "#136", SetLastError = true, CharSet = CharSet.Unicode)]
+    public static extern void FlushMenuThemes();
+
     [DllImport(Lib.UxTheme, SetLastError = false, ExactSpelling = true)]
     public static extern int SetWindowThemeAttribute(nint hwnd, WINDOWTHEMEATTRIBUTETYPE eAttribute, in WTA_OPTIONS pvAttribute, uint cbAttribute);
 
@@ -62,4 +68,13 @@ public struct WTA_OPTIONS
         public WTNCA Flags;
         public uint Mask;
     }
+
+    public enum PreferredAppMode : int
+    {
+        Default,
+        AllowDark,
+        ForceDark,
+        ForceLight,
+        Max,
+    };
 }