55 lines
1.7 KiB
TypeScript
55 lines
1.7 KiB
TypeScript
import { createContext, useContext, useState, useEffect, ReactNode } from "react";
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type Theme = "light" | "dark";
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type 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 = ({ children }: { children: ReactNode }) => {
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const [theme, setTheme] = useState<Theme | null>(null); // null = tema ainda não carregado
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useEffect(() => {
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const storedTheme = localStorage.getItem("theme") as Theme | null;
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const prefersDark = window.matchMedia("(prefers-color-scheme: dark)").matches;
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const initialTheme = storedTheme ?? (prefersDark ? "dark" : "light");
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setTheme(initialTheme);
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}, []);
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useEffect(() => {
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if (theme === null) return; // ainda a carregar
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const root = 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) => {
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const nextTheme = prev === "dark" ? "light" : "dark";
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console.log("ToggleTheme:", prev, "->", nextTheme);
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return nextTheme;
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});
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//setTheme((prev) => (prev === "dark" ? "light" : "dark"));
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};
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// Enquanto tema não carregou, não renderiza nada
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if (theme === null) return null;
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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) throw new Error("useTheme must be used within ThemeProvider");
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return context;
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};
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