m4
90 lines
2.7 KiB
TypeScript
90 lines
2.7 KiB
TypeScript
"use client";
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import {
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createContext,
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useCallback,
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useContext,
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useEffect,
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useState,
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} from "react";
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import { Toaster } from "sonner";
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import {
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DARK_QUERY,
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getStoredTheme,
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THEME_STORAGE_KEY,
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type ResolvedTheme,
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type Theme,
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} from "@/lib/theme";
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interface ThemeContextValue {
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/** The user's selection: light, dark, or follow-system. */
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theme: Theme;
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/** The actually-applied theme after resolving "system". */
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resolvedTheme: ResolvedTheme;
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setTheme: (theme: Theme) => void;
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}
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const ThemeContext = createContext<ThemeContextValue | null>(null);
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function applyTheme(resolved: ResolvedTheme) {
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const root = document.documentElement;
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root.classList.toggle("dark", resolved === "dark");
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root.style.colorScheme = resolved;
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}
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export function ThemeProvider({ children }: { children: React.ReactNode }) {
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// Lazy initializer reads the stored choice on the client's first render, so the
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// single effect below resolves the right theme on its first run — no
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// "system → stored" double-apply flash. On the server it returns "system" (no
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// localStorage); the inline pre-paint script in layout.tsx has already set the
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// class, so nothing flashes regardless.
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const [theme, setThemeState] = useState<Theme>(getStoredTheme);
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const [resolvedTheme, setResolvedTheme] = useState<ResolvedTheme>("light");
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useEffect(() => {
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const mql = window.matchMedia(DARK_QUERY);
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const apply = () => {
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const resolved: ResolvedTheme =
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theme === "system" ? (mql.matches ? "dark" : "light") : theme;
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setResolvedTheme((current) =>
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current === resolved ? current : resolved
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);
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applyTheme(resolved);
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};
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apply();
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// Track live OS changes only while following the system.
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if (theme !== "system") return;
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mql.addEventListener("change", apply);
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return () => mql.removeEventListener("change", apply);
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}, [theme]);
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const setTheme = useCallback((next: Theme) => {
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try {
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localStorage.setItem(THEME_STORAGE_KEY, next);
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} catch {
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// Private mode / storage disabled — fall back to in-memory only.
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}
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setThemeState((current) => (current === next ? current : next));
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}, []);
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return (
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<ThemeContext.Provider value={{ theme, resolvedTheme, setTheme }}>
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{children}
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</ThemeContext.Provider>
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);
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}
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export function useTheme(): ThemeContextValue {
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const ctx = useContext(ThemeContext);
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if (!ctx) {
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throw new Error("useTheme must be used within a ThemeProvider");
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}
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return ctx;
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}
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/** Sonner toaster that follows the resolved theme (must render inside ThemeProvider). */
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export function ThemedToaster() {
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const { resolvedTheme } = useTheme();
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return <Toaster theme={resolvedTheme} />;
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}
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