50 lines
1.3 KiB
TypeScript
50 lines
1.3 KiB
TypeScript
"use client";
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import { createContext, useContext, useEffect, useState, ReactNode } from "react";
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type Theme = "light" | "dark";
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const ThemeContext = createContext<{
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theme: Theme;
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setTheme: (t: Theme) => void;
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toggle: () => void;
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}>({
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theme: "light",
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setTheme: () => {},
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toggle: () => {},
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});
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export function ThemeProvider({ children }: { children: ReactNode }) {
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const [theme, setThemeState] = useState<Theme>("light");
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const [mounted, setMounted] = useState(false);
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useEffect(() => {
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// Read from localStorage, fall back to system preference
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const stored = localStorage.getItem("theme") as Theme | null;
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if (stored === "dark" || stored === "light") {
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setThemeState(stored);
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} else if (window.matchMedia("(prefers-color-scheme: dark)").matches) {
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setThemeState("dark");
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}
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setMounted(true);
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}, []);
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useEffect(() => {
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if (!mounted) return;
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document.documentElement.classList.toggle("dark", theme === "dark");
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localStorage.setItem("theme", theme);
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}, [theme, mounted]);
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const setTheme = (t: Theme) => setThemeState(t);
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const toggle = () => setThemeState((t) => (t === "dark" ? "light" : "dark"));
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return (
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<ThemeContext.Provider value={{ theme, setTheme, toggle }}>
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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() {
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return useContext(ThemeContext);
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}
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