50 lines
1.4 KiB
TypeScript
50 lines
1.4 KiB
TypeScript
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import React, { createContext, useContext, useEffect, useState } from 'react';
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type Theme = 'dark' | 'light' | 'ocean';
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interface ThemeContextType {
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theme: Theme;
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setTheme: (theme: Theme) => 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: React.ReactNode }> = ({ children }) => {
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const [theme, setTheme] = useState<Theme>(() => {
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// Check local storage or system preference
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const saved = localStorage.getItem('theme');
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if (saved) return saved as Theme;
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return 'dark'; // Default
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});
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useEffect(() => {
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const root = window.document.documentElement;
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// Remove old classes
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root.classList.remove('theme-light', 'theme-ocean', 'dark');
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// Add new class
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if (theme === 'dark') {
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root.classList.add('dark');
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} else {
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root.classList.add(`theme-${theme}`);
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}
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localStorage.setItem('theme', theme);
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}, [theme]);
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return (
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<ThemeContext.Provider value={{ theme, 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 const useTheme = () => {
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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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