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feat(ui): add theme toggle and clean up loading state #175
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,60 @@ | ||
| import {useEffect, useState} from 'react'; | ||
|
|
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| import { | ||
| applyTheme, | ||
| getStoredTheme, | ||
| getSystemTheme, | ||
| storeTheme, | ||
| type Theme, | ||
| } from '../theme'; | ||
|
|
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| export function ThemeToggle({className = ''}: {className?: string}) { | ||
| const [theme, setTheme] = useState<Theme>(() => getStoredTheme() ?? getSystemTheme()); | ||
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| useEffect(() => { | ||
| const storedTheme = getStoredTheme(); | ||
| const activeTheme = storedTheme ?? getSystemTheme(); | ||
| setTheme(activeTheme); | ||
| applyTheme(activeTheme); | ||
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|
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| if (storedTheme || !window.matchMedia) return; | ||
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| const media = window.matchMedia('(prefers-color-scheme: dark)'); | ||
| const syncWithSystem = (event: MediaQueryListEvent) => { | ||
| if (getStoredTheme()) return; | ||
| const nextTheme = event.matches ? 'dark' : 'light'; | ||
| setTheme(nextTheme); | ||
| applyTheme(nextTheme); | ||
| }; | ||
| media.addEventListener('change', syncWithSystem); | ||
| return () => media.removeEventListener('change', syncWithSystem); | ||
| }, []); | ||
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| function toggleTheme() { | ||
| const nextTheme = theme === 'dark' ? 'light' : 'dark'; | ||
| setTheme(nextTheme); | ||
| applyTheme(nextTheme); | ||
| storeTheme(nextTheme); | ||
| } | ||
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| const nextTheme = theme === 'dark' ? 'light' : 'dark'; | ||
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| return ( | ||
| <button | ||
| className={`themeToggle${className ? ` ${className}` : ''}`} | ||
| type="button" | ||
| aria-label={`Switch to ${nextTheme} mode`} | ||
| title={`Switch to ${nextTheme} mode`} | ||
| aria-pressed={theme === 'dark'} | ||
| onClick={toggleTheme} | ||
| > | ||
| <span className="themeToggleSun" aria-hidden="true"> | ||
| ☀ | ||
| </span> | ||
| <span className="themeToggleMoon" aria-hidden="true"> | ||
| ☾ | ||
| </span> | ||
| <span className="themeToggleThumb" aria-hidden="true" /> | ||
| </button> | ||
| ); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,28 @@ | ||
| export type Theme = 'light' | 'dark'; | ||
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| const THEME_STORAGE_KEY = 'hackweek.theme'; | ||
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| export function getStoredTheme(): Theme | null { | ||
| try { | ||
| const theme = window.localStorage.getItem(THEME_STORAGE_KEY); | ||
| return theme === 'light' || theme === 'dark' ? theme : null; | ||
| } catch { | ||
| return null; | ||
| } | ||
| } | ||
|
|
||
| export function getSystemTheme(): Theme { | ||
| return window.matchMedia?.('(prefers-color-scheme: dark)').matches ? 'dark' : 'light'; | ||
| } | ||
|
HazAT marked this conversation as resolved.
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| export function applyTheme(theme: Theme) { | ||
| document.documentElement.dataset.theme = theme; | ||
| } | ||
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| export function storeTheme(theme: Theme) { | ||
| try { | ||
| window.localStorage.setItem(THEME_STORAGE_KEY, theme); | ||
| } catch { | ||
| return; | ||
| } | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,23 @@ | ||
| import {render, screen} from '@testing-library/react'; | ||
| import userEvent from '@testing-library/user-event'; | ||
| import {afterEach, describe, expect, it} from 'vitest'; | ||
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| import {ThemeToggle} from '../../src/app/components/ThemeToggle'; | ||
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| afterEach(() => { | ||
| window.localStorage.removeItem('hackweek.theme'); | ||
| delete document.documentElement.dataset.theme; | ||
| }); | ||
|
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| describe('theme toggle', () => { | ||
| it('switches modes and remembers the selected theme', async () => { | ||
| render(<ThemeToggle />); | ||
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| const toggle = screen.getByRole('button', {name: 'Switch to dark mode'}); | ||
| await userEvent.click(toggle); | ||
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| expect(document.documentElement.dataset.theme).toBe('dark'); | ||
| expect(window.localStorage.getItem('hackweek.theme')).toBe('dark'); | ||
| expect(toggle.getAttribute('aria-label')).toBe('Switch to light mode'); | ||
| }); | ||
| }); |
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