47 lines
1.3 KiB
TypeScript
47 lines
1.3 KiB
TypeScript
import React, { createContext, useContext, useEffect, useState } from 'react';
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type Theme = 'light' | 'dark';
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interface ThemeContextType {
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theme: Theme;
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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: React.ReactNode }> = ({ children }) => {
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const [theme, setTheme] = useState<Theme>(() => {
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const saved = localStorage.getItem('theme');
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if (saved === 'light' || saved === 'dark') return saved;
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if (window.matchMedia && window.matchMedia('(prefers-color-scheme: light)').matches) {
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return 'light';
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}
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return 'dark';
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});
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useEffect(() => {
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const root = window.document.documentElement;
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root.classList.remove('light', 'dark');
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root.classList.add(theme);
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localStorage.setItem('theme', theme);
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}, [theme]);
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const toggleTheme = () => {
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setTheme(prev => (prev === '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 = () => {
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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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