64 lines
1.9 KiB
TypeScript
64 lines
1.9 KiB
TypeScript
import React, { createContext, useContext, useState, useEffect, ReactNode } from 'react';
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type ThemeType = 'light' | 'dark';
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interface ThemeContextType {
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theme: ThemeType;
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toggleTheme: () => void;
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}
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const ThemeContext = createContext<ThemeContextType | undefined>(undefined);
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export const ThemeProvider: React.FC<{ children: ReactNode }> = ({ children }) => {
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const getInitialTheme = (): ThemeType => {
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const savedTheme = localStorage.getItem('theme');
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if (savedTheme && (savedTheme === 'light' || savedTheme === 'dark')) {
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return savedTheme;
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}
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return window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light';
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};
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const [theme, setTheme] = useState<ThemeType>(getInitialTheme);
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useEffect(() => {
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if (theme === 'dark') {
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document.documentElement.classList.add('dark');
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} else {
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document.documentElement.classList.remove('dark');
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}
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localStorage.setItem('theme', theme);
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}, [theme]);
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useEffect(() => {
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const mediaQuery = window.matchMedia('(prefers-color-scheme: dark)');
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const handleChange = (e: MediaQueryListEvent) => {
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// Only apply system preference if user hasn't manually set a preference
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if (!localStorage.getItem('theme')) {
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setTheme(e.matches ? 'dark' : 'light');
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}
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};
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mediaQuery.addEventListener('change', handleChange);
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return () => mediaQuery.removeEventListener('change', handleChange);
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}, []);
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const toggleTheme = () => {
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setTheme(prevTheme => (prevTheme === 'dark' ? 'light' : 'dark'));
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};
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return (
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<ThemeContext.Provider value={{ theme, toggleTheme }}>
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{children}
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</ThemeContext.Provider>
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);
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};
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export const useTheme = (): ThemeContextType => {
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const context = useContext(ThemeContext);
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if (context === undefined) {
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throw new Error('useTheme must be used within a ThemeProvider');
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}
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return context;
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};
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