108 lines
2.9 KiB
Rust
108 lines
2.9 KiB
Rust
use leptos::prelude::*;
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use web_sys::Storage;
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#[derive(Debug, Clone, Copy)]
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pub struct ThemeMode {
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state: RwSignal<bool>,
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}
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const LOCALSTORAGE_KEY: &str = "darkmode";
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/// Hook to access the dark mode context
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///
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/// Returns the ThemeMode instance from context for easy access
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pub fn use_theme_mode() -> ThemeMode {
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expect_context::<ThemeMode>()
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}
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/* ========================================================== */
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/* ✨ FUNCTIONS ✨ */
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/* ========================================================== */
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impl ThemeMode {
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#[must_use]
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/// Initializes a new ThemeMode instance.
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pub fn init() -> Self {
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let theme_mode = Self { state: RwSignal::new(false) };
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provide_context(theme_mode);
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// Use Effect to handle browser-only initialization
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Effect::new(move |_| {
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let initial = Self::get_storage_state().unwrap_or(Self::prefers_dark_mode());
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theme_mode.state.set(initial);
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});
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theme_mode
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}
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pub fn toggle(&self) {
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self.state.update(|state| {
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*state = !*state;
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Self::set_storage_state(*state);
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});
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}
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pub fn set_dark(&self) {
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self.set(true);
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}
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pub fn set_light(&self) {
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self.set(false);
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}
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/// - `dark`: Set to `true` for dark mode, and `false` for light mode.
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pub fn set(&self, dark: bool) {
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self.state.set(dark);
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Self::set_storage_state(dark);
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}
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#[must_use]
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pub fn get(&self) -> bool {
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self.state.get()
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}
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#[must_use]
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pub fn is_dark(&self) -> bool {
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self.state.get()
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}
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#[must_use]
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pub fn is_light(&self) -> bool {
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!self.state.get()
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}
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/* ========================================================== */
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/* ✨ FUNCTIONS ✨ */
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/* ========================================================== */
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/// Retrieves the local storage object, if available.
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fn get_storage() -> Option<Storage> {
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window().local_storage().ok().flatten()
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}
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/// Retrieves the dark mode state from local storage, if available.
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fn get_storage_state() -> Option<bool> {
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Self::get_storage()
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.and_then(|storage| storage.get(LOCALSTORAGE_KEY).ok())
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.flatten()
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.and_then(|entry| entry.parse::<bool>().ok())
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}
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/// Checks whether the user's system prefers dark mode based on media queries.
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fn prefers_dark_mode() -> bool {
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window()
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.match_media("(prefers-color-scheme: dark)")
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.ok()
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.flatten()
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.map(|media| media.matches())
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.unwrap_or_default()
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}
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/// Stores the dark mode state in local storage.
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fn set_storage_state(state: bool) {
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if let Some(storage) = Self::get_storage() {
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storage.set(LOCALSTORAGE_KEY, state.to_string().as_str()).ok();
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}
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}
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} |