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| 1 | +import { createContext, useContext, useEffect, useState } from "react" |
| 2 | + |
| 3 | +type Theme = "dark" | "light" | "system" |
| 4 | + |
| 5 | +type ThemeProviderProps = { |
| 6 | + children: React.ReactNode |
| 7 | + defaultTheme?: Theme |
| 8 | + storageKey?: string |
| 9 | +} |
| 10 | + |
| 11 | +type ThemeProviderState = { |
| 12 | + theme: Theme |
| 13 | + setTheme: (theme: Theme) => void |
| 14 | +} |
| 15 | + |
| 16 | +const initialState: ThemeProviderState = { |
| 17 | + theme: "system", |
| 18 | + setTheme: () => null, |
| 19 | +} |
| 20 | + |
| 21 | +const ThemeProviderContext = createContext<ThemeProviderState>(initialState) |
| 22 | + |
| 23 | +export function ThemeProvider({ |
| 24 | + children, |
| 25 | + defaultTheme = "system", |
| 26 | + storageKey = "vite-ui-theme", |
| 27 | + ...props |
| 28 | +}: ThemeProviderProps) { |
| 29 | + const [theme, setTheme] = useState<Theme>( |
| 30 | + () => (localStorage.getItem(storageKey) as Theme) || defaultTheme |
| 31 | + ) |
| 32 | + |
| 33 | + useEffect(() => { |
| 34 | + const root = window.document.documentElement |
| 35 | + |
| 36 | + root.classList.remove("light", "dark") |
| 37 | + |
| 38 | + if (theme === "system") { |
| 39 | + const systemTheme = window.matchMedia("(prefers-color-scheme: dark)") |
| 40 | + .matches |
| 41 | + ? "dark" |
| 42 | + : "light" |
| 43 | + |
| 44 | + root.classList.add(systemTheme) |
| 45 | + return |
| 46 | + } |
| 47 | + |
| 48 | + root.classList.add(theme) |
| 49 | + }, [theme]) |
| 50 | + |
| 51 | + const value = { |
| 52 | + theme, |
| 53 | + setTheme: (theme: Theme) => { |
| 54 | + localStorage.setItem(storageKey, theme) |
| 55 | + setTheme(theme) |
| 56 | + }, |
| 57 | + } |
| 58 | + |
| 59 | + return ( |
| 60 | + <ThemeProviderContext.Provider {...props} value={value}> |
| 61 | + {children} |
| 62 | + </ThemeProviderContext.Provider> |
| 63 | + ) |
| 64 | +} |
| 65 | + |
| 66 | +export const useTheme = () => { |
| 67 | + const context = useContext(ThemeProviderContext) |
| 68 | + |
| 69 | + if (context === undefined) |
| 70 | + throw new Error("useTheme must be used within a ThemeProvider") |
| 71 | + |
| 72 | + return context |
| 73 | +} |
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