enhance(windows): apply dark mode to menus and other controls (#751)

* fix(windows): Apply dark mode to menus

* refactor dark mode logic, and add app-wide theme api

* fix docs build

---------

Co-authored-by: ahodesuka <ahodesuka@users.noreply.github.com>
Co-authored-by: Amr Bashir <amr.bashir2015@gmail.com>

.changes/apply-dark-mode-to-menus.md

@@ -0,0 +1,5 @@
+---
+"tao": patch
+---
+
+On Windows, apply dark mode app-wide to some controls like context menus.

.changes/windows-app-wide-theme.md

@@ -0,0 +1,5 @@
+---
+"tao": "patch"
+---
+
+On Windows, add `EventLoopBuilderExtWindows::with_theme` to control the app-wide theme.

Cargo.toml

@@ -51,12 +51,14 @@ url = "2"
 image = "0.24"
 env_logger = "0.10"
 
+[target."cfg(any(target_os = \"android\", target_os = \"windows\"))".dependencies]
+once_cell = "1"
+
 [target."cfg(target_os = \"android\")".dependencies]
 jni = "0.21"
 ndk = "0.7"
 ndk-sys = "0.4"
 ndk-context = "0.1"
-once_cell = "1"
 tao-macros = { version = "0.1.0", path = "./tao-macros" }
 
 [target."cfg(any(target_os = \"ios\", target_os = \"macos\"))".dependencies]
@@ -76,9 +78,9 @@ unicode-segmentation = "1.10"
 image = { version = "0.24", default-features = false }
 windows-implement = "0.48.0"
 
-  [target."cfg(target_os = \"windows\")".dependencies.windows]
-  version = "0.48.0"
-  features = [
+[target."cfg(target_os = \"windows\")".dependencies.windows]
+version = "0.48.0"
+features = [
   "implement",
   "Win32_Devices_HumanInterfaceDevice",
   "Win32_Foundation",
@@ -95,6 +97,7 @@ windows-implement = "0.48.0"
   "Win32_System_SystemServices",
   "Win32_System_Threading",
   "Win32_System_WindowsProgramming",
+  "Win32_System_SystemInformation",
   "Win32_UI_Accessibility",
   "Win32_UI_Controls",
   "Win32_UI_HiDpi",
@@ -104,7 +107,7 @@ windows-implement = "0.48.0"
   "Win32_UI_Input_Touch",
   "Win32_UI_Shell",
   "Win32_UI_TextServices",
-  "Win32_UI_WindowsAndMessaging"
+  "Win32_UI_WindowsAndMessaging",
 ]
 
 [target."cfg(any(target_os = \"linux\", target_os = \"dragonfly\", target_os = \"freebsd\", target_os = \"openbsd\", target_os = \"netbsd\"))".dependencies]

src/platform/windows.rs

@@ -87,6 +87,19 @@ pub trait EventLoopBuilderExtWindows {
   fn with_msg_hook<F>(&mut self, callback: F) -> &mut Self
   where
     F: FnMut(*const std::ffi::c_void) -> bool + 'static;
+
+  /// Forces a theme or uses the system settings if `None` was provided.
+  ///
+  /// This will only affect some controls like context menus.
+  ///
+  /// ## Note
+  ///
+  /// Since this setting is app-wide, using [`WindowBuilder::with_theme`]
+  /// will not change the affected controls for that specific window,
+  /// so it is recommended to always use the same theme used for this app-wide setting
+  /// or use `None` so it automatically uses the theme of this method
+  /// or falls back to the system preference.
+  fn with_theme(&mut self, theme: Option<Theme>) -> &mut Self;
 }
 
 impl<T> EventLoopBuilderExtWindows for EventLoopBuilder<T> {
@@ -110,6 +123,13 @@ impl<T> EventLoopBuilderExtWindows for EventLoopBuilder<T> {
     self.platform_specific.msg_hook = Some(Box::new(callback));
     self
   }
+
+  #[inline]
+
+  fn with_theme(&mut self, theme: Option<Theme>) -> &mut Self {
+    self.platform_specific.preferred_theme = theme;
+    self
+  }
 }
 
 /// Additional methods on `Window` that are specific to Windows.