65 行
1.4 KiB
TypeScript
65 行
1.4 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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switchable: boolean;
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}
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const ThemeContext = createContext<ThemeContextType | undefined>(undefined);
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interface ThemeProviderProps {
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children: React.ReactNode;
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defaultTheme?: Theme;
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switchable?: boolean;
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}
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export function ThemeProvider({
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children,
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defaultTheme = "light",
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switchable = false,
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}: ThemeProviderProps) {
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const [theme, setTheme] = useState<Theme>(() => {
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if (switchable) {
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const stored = localStorage.getItem("theme");
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return (stored as Theme) || defaultTheme;
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}
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return defaultTheme;
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});
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useEffect(() => {
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const root = document.documentElement;
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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.remove("dark");
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}
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if (switchable) {
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localStorage.setItem("theme", theme);
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}
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}, [theme, switchable]);
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const toggleTheme = switchable
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? () => {
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setTheme(prev => (prev === "light" ? "dark" : "light"));
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}
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: undefined;
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return (
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<ThemeContext.Provider value={{ theme, toggleTheme, switchable }}>
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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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const context = useContext(ThemeContext);
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if (!context) {
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throw new Error("useTheme must be used within ThemeProvider");
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}
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return context;
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}
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