certimate/ui/src/components/ThemeProvider.tsx
2024-10-15 21:15:21 +08:00

63 lines
1.5 KiB
TypeScript

import { createContext, useContext, useEffect, useState } from "react";
type Theme = "dark" | "light" | "system";
type ThemeProviderProps = {
children: React.ReactNode;
defaultTheme?: Theme;
storageKey?: string;
};
type ThemeProviderState = {
theme: Theme;
setTheme: (theme: Theme) => void;
};
const initialState: ThemeProviderState = {
theme: "system",
setTheme: () => null,
};
const ThemeProviderContext = createContext<ThemeProviderState>(initialState);
export function ThemeProvider({ children, defaultTheme = "system", storageKey = "vite-ui-theme", ...props }: ThemeProviderProps) {
const [theme, setTheme] = useState<Theme>(() => (localStorage.getItem(storageKey) as Theme) || defaultTheme);
useEffect(() => {
const root = window.document.documentElement;
root.classList.remove("light", "dark");
if (theme === "system") {
const systemTheme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "dark" : "light";
root.classList.add(systemTheme);
return;
}
root.classList.add(theme);
}, [theme]);
const value = {
theme,
setTheme: (theme: Theme) => {
localStorage.setItem(storageKey, theme);
setTheme(theme);
},
};
return (
<ThemeProviderContext.Provider {...props} value={value}>
{children}
</ThemeProviderContext.Provider>
);
}
export const useTheme = () => {
const context = useContext(ThemeProviderContext);
if (context === undefined) throw new Error("useTheme must be used within a ThemeProvider");
return context;
};