60 lines
1.7 KiB
TypeScript
60 lines
1.7 KiB
TypeScript
"use client";
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import { useSyncExternalStore } from "react";
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import { Moon, Sun } from "lucide-react";
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import { useI18n } from "./I18nProvider";
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import { themeStorageKey, type Theme } from "@/shared/theme";
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function currentTheme(): Theme {
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return document.documentElement.dataset.theme === "light" ? "light" : "dark";
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}
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function subscribe(onChange: () => void) {
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const observer = new MutationObserver(onChange);
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observer.observe(document.documentElement, {
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attributes: true,
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attributeFilter: ["data-theme"],
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});
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function syncStorage(event: StorageEvent) {
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if (event.key === themeStorageKey || event.key === null) {
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document.documentElement.dataset.theme =
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event.newValue === "light" ? "light" : "dark";
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}
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}
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window.addEventListener("storage", syncStorage);
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return () => {
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observer.disconnect();
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window.removeEventListener("storage", syncStorage);
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};
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}
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export function ThemeToggle() {
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const { t } = useI18n();
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const theme = useSyncExternalStore(subscribe, currentTheme, () => "dark");
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const label = t(
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theme === "light" ? "Turn on dark mode" : "Turn on light mode",
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);
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function toggle() {
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const next = currentTheme() === "light" ? "dark" : "light";
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document.documentElement.dataset.theme = next;
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try {
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localStorage.setItem(themeStorageKey, next);
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} catch {
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// Switching still works for this visit if browser storage is unavailable.
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}
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}
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return (
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<button
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type="button"
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className="theme-toggle"
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onClick={toggle}
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aria-label={label}
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title={label}
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aria-pressed={theme === "light"}
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>
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<Sun className="theme-sun" size={19} aria-hidden="true" />
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<Moon className="theme-moon" size={19} aria-hidden="true" />
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</button>
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);
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}
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