File size: 1,954 Bytes
057576a | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 | import React, { createContext, useContext, useEffect, useState } from 'react';
const ThemeContext = createContext();
export const useTheme = () => {
const context = useContext(ThemeContext);
if (!context) {
throw new Error('useTheme must be used within a ThemeProvider');
}
return context;
};
export const ThemeProvider = ({ children }) => {
const [theme, setTheme] = useState(() => {
const savedTheme = localStorage.getItem('theme');
return savedTheme || 'system';
});
const [resolvedTheme, setResolvedTheme] = useState('light');
useEffect(() => {
const root = window.document.documentElement;
const updateTheme = () => {
const systemTheme = window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light';
const effectiveTheme = theme === 'system' ? systemTheme : theme;
setResolvedTheme(effectiveTheme);
root.classList.remove('light', 'dark');
root.classList.add(effectiveTheme);
localStorage.setItem('theme', theme);
};
updateTheme();
// Listen for system theme changes
const mediaQuery = window.matchMedia('(prefers-color-scheme: dark)');
const handleChange = () => {
if (theme === 'system') {
updateTheme();
}
};
mediaQuery.addEventListener('change', handleChange);
return () => mediaQuery.removeEventListener('change', handleChange);
}, [theme]);
const toggleTheme = () => {
setTheme(prev => {
if (prev === 'light') return 'dark';
if (prev === 'dark') return 'system';
return 'light';
});
};
const setCustomTheme = (newTheme) => {
setTheme(newTheme);
};
const value = {
theme,
resolvedTheme,
toggleTheme,
setTheme: setCustomTheme
};
return (
<ThemeContext.Provider value={value}>
{children}
</ThemeContext.Provider>
);
}; |