[desktop] Add rust-dark-light as direct dependency

desktop/tauri/rust-dark-light/src/lib.rs

@@ -0,0 +1,73 @@
+//! Detect if dark mode or light mode is enabled.
+//!
+//! # Examples
+//!
+//! ```
+//! let mode = dark_light::detect();
+//!
+//! match mode {
+//!     // Dark mode
+//!     dark_light::Mode::Dark => {},
+//!     // Light mode
+//!     dark_light::Mode::Light => {},
+//!     // Unspecified
+//!     dark_light::Mode::Default => {},
+//! }
+//! ```
+
+mod platforms;
+use platforms::platform;
+
+mod utils;
+#[cfg(any(
+    target_os = "linux",
+    target_os = "freebsd",
+    target_os = "dragonfly",
+    target_os = "netbsd",
+    target_os = "openbsd"
+))]
+use utils::rgb::Rgb;
+
+/// Enum representing dark mode, light mode, or unspecified.
+#[derive(Copy, Clone, PartialEq, Eq, Debug)]
+pub enum Mode {
+    /// Dark mode
+    Dark,
+    /// Light mode
+    Light,
+    /// Unspecified
+    Default,
+}
+
+impl Mode {
+    #[allow(dead_code)]
+    fn from_bool(b: bool) -> Self {
+        if b {
+            Mode::Dark
+        } else {
+            Mode::Light
+        }
+    }
+
+    #[cfg(any(
+        target_os = "linux",
+        target_os = "freebsd",
+        target_os = "dragonfly",
+        target_os = "netbsd",
+        target_os = "openbsd"
+    ))]
+    /// Convert an RGB color to [`Mode`]. The color is converted to grayscale, and if the grayscale value is less than 192, [`Mode::Dark`] is returned. Otherwise, [`Mode::Light`] is returned.
+    fn from_rgb(rgb: Rgb) -> Self {
+        let window_background_gray = (rgb.0 * 11 + rgb.1 * 16 + rgb.2 * 5) / 32;
+        if window_background_gray < 192 {
+            Self::Dark
+        } else {
+            Self::Light
+        }
+    }
+}
+
+/// Detect if light mode or dark mode is enabled. If the mode can’t be detected, fall back to [`Mode::Default`].
+pub use platform::detect::detect;
+/// Notifies the user if the system theme has been changed.
+pub use platform::notify::subscribe;