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feat(ui): add persistent dark mode toggle and system color-scheme detection (fix #1050) #154

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feat(ui): add persistent dark mode toggle and system color-scheme detection (fix #1050) #154

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12 changes: 6 additions & 6 deletions frontend/src/context/ThemeContext.jsx
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Original file line number Diff line number Diff line change
@@ -1,30 +1,30 @@

import { createContext, useState, useContext, useEffect } from "react";

const ThemeContext = createContext();
const ThemeContext = createContext({ theme: "light", toggleTheme: () => {} });

export const useTheme = () => useContext(ThemeContext);

export const ThemeProvider = ({ children }) => {
const [theme, setTheme] = useState(() => {
const saved = localStorage.getItem("theme");
return saved || "light"; // Default "light"
if (saved) return saved;
return window.matchMedia("(prefers-color-scheme: dark)").matches ? "dark" : "light";
});

useEffect(() => {
localStorage.setItem("theme", theme);

if (theme === "dark") {
document.documentElement.classList.add("dark");
document.documentElement.setAttribute("data-theme", "dark");
} else {
document.documentElement.classList.remove("dark");
document.documentElement.setAttribute("data-theme", "light");
}


}, [theme]);

const toggleTheme = () => {
setTheme(prev => (prev === "dark" ? "light" : "dark"));
setTheme((prev) => (prev === "dark" ? "light" : "dark"));
};

return (
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7 changes: 5 additions & 2 deletions frontend/src/main.jsx
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Original file line number Diff line number Diff line change
Expand Up @@ -2,12 +2,15 @@ import { StrictMode } from 'react';
import { createRoot } from 'react-dom/client';
import { BrowserRouter } from 'react-router-dom';
import { Toaster } from 'react-hot-toast';
import { ThemeProvider } from './context/ThemeContext.jsx';
import App from './App.jsx';
import './index.css';

createRoot(document.getElementById('root')).render(
<StrictMode>
<App />
<Toaster position="top-right" />
<ThemeProvider>
<App />
<Toaster position="top-right" />
</ThemeProvider>
</StrictMode>
);
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