134 lines
4.7 KiB
TypeScript
134 lines
4.7 KiB
TypeScript
import { useEffect, useState } from 'react'
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type Theme = 'light' | 'dark'
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export default function ThemeSwitcher() {
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const [theme, setTheme] = useState<Theme>(() => {
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// 初始化时读取保存的主题
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if (typeof window !== 'undefined') {
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const savedTheme = localStorage.getItem('theme') as Theme | null
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if (savedTheme === 'light' || savedTheme === 'dark') {
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return savedTheme
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}
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// 默认跟随系统
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return window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light'
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}
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return 'light'
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})
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useEffect(() => {
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// 应用主题
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if (theme === 'dark') {
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document.documentElement.classList.add('dark')
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document.documentElement.style.colorScheme = 'dark'
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} else {
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document.documentElement.classList.remove('dark')
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document.documentElement.style.colorScheme = 'light'
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}
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// 保存到 localStorage
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localStorage.setItem('theme', theme)
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}, [theme])
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// 监听系统主题变化
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useEffect(() => {
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const mediaQuery = window.matchMedia('(prefers-color-scheme: dark)')
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const handleSystemThemeChange = (e: MediaQueryListEvent) => {
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// 只有在用户未手动设置时才自动跟随系统
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const savedTheme = localStorage.getItem('theme')
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if (!savedTheme) {
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setTheme(e.matches ? 'dark' : 'light')
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}
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}
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mediaQuery.addEventListener('change', handleSystemThemeChange)
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return () => mediaQuery.removeEventListener('change', handleSystemThemeChange)
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}, [])
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const toggleTheme = () => {
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setTheme((prev) => (prev === 'light' ? 'dark' : 'light'))
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}
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return (
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<button
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onClick={toggleTheme}
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className="relative inline-flex items-center h-8 w-16 rounded-full transition-colors duration-300 ease-in-out focus:outline-none"
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style={{
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backgroundColor: theme === 'dark' ? '#1e293b' : '#e0f2fe',
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}}
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aria-label={theme === 'light' ? 'Switch to dark mode' : 'Switch to light mode'}
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role="switch"
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aria-checked={theme === 'dark'}
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>
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{/* 滑块 */}
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<span
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className="inline-block h-6 w-6 transform rounded-full transition-all duration-300 ease-in-out shadow-md"
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style={{
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backgroundColor: theme === 'dark' ? '#475569' : '#fbbf24',
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transform: theme === 'dark' ? 'translateX(2.25rem)' : 'translateX(0.25rem)',
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}}
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>
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{/* 图标 */}
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<span className="flex items-center justify-center h-full w-full">
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{theme === 'light' ? (
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// 太阳图标
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<svg
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className="w-4 h-4 text-white"
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fill="currentColor"
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viewBox="0 0 20 20"
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aria-hidden="true"
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>
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<path
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fillRule="evenodd"
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d="M10 2a1 1 0 011 1v1a1 1 0 11-2 0V3a1 1 0 011-1zm4 8a4 4 0 11-8 0 4 4 0 018 0zm-.464 4.95l.707.707a1 1 0 001.414-1.414l-.707-.707a1 1 0 00-1.414 1.414zm2.12-10.607a1 1 0 010 1.414l-.706.707a1 1 0 11-1.414-1.414l.707-.707a1 1 0 011.414 0zM17 11a1 1 0 100-2h-1a1 1 0 100 2h1zm-7 4a1 1 0 011 1v1a1 1 0 11-2 0v-1a1 1 0 011-1zM5.05 6.464A1 1 0 106.465 5.05l-.708-.707a1 1 0 00-1.414 1.414l.707.707zm1.414 8.486l-.707.707a1 1 0 01-1.414-1.414l.707-.707a1 1 0 011.414 1.414zM4 11a1 1 0 100-2H3a1 1 0 000 2h1z"
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clipRule="evenodd"
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/>
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</svg>
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) : (
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// 月亮图标
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<svg
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className="w-4 h-4 text-slate-200"
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fill="currentColor"
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viewBox="0 0 20 20"
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aria-hidden="true"
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>
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<path d="M17.293 13.293A8 8 0 016.707 2.707a8.001 8.001 0 1010.586 10.586z" />
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</svg>
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)}
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</span>
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</span>
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{/* 背景装饰 */}
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<span
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className="absolute inset-0 flex items-center justify-between px-2 pointer-events-none"
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aria-hidden="true"
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>
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{/* 左侧太阳（浅色模式时显示） */}
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<span
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className={`transition-opacity duration-300 ${
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theme === 'light' ? 'opacity-0' : 'opacity-40'
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}`}
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>
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<svg className="w-4 h-4 text-sky-400" fill="currentColor" viewBox="0 0 20 20">
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<path
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fillRule="evenodd"
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d="M10 2a1 1 0 011 1v1a1 1 0 11-2 0V3a1 1 0 011-1zm4 8a4 4 0 11-8 0 4 4 0 018 0zm-.464 4.95l.707.707a1 1 0 001.414-1.414l-.707-.707a1 1 0 00-1.414 1.414zm2.12-10.607a1 1 0 010 1.414l-.706.707a1 1 0 11-1.414-1.414l.707-.707a1 1 0 011.414 0zM17 11a1 1 0 100-2h-1a1 1 0 100 2h1zm-7 4a1 1 0 011 1v1a1 1 0 11-2 0v-1a1 1 0 011-1zM5.05 6.464A1 1 0 106.465 5.05l-.708-.707a1 1 0 00-1.414 1.414l.707.707zm1.414 8.486l-.707.707a1 1 0 01-1.414-1.414l.707-.707a1 1 0 011.414 1.414zM4 11a1 1 0 100-2H3a1 1 0 000 2h1z"
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clipRule="evenodd"
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/>
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</svg>
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</span>
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{/* 右侧月亮（深色模式时显示） */}
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<span
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className={`transition-opacity duration-300 ${
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theme === 'dark' ? 'opacity-0' : 'opacity-40'
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}`}
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>
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<svg className="w-4 h-4 text-slate-400" fill="currentColor" viewBox="0 0 20 20">
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<path d="M17.293 13.293A8 8 0 016.707 2.707a8.001 8.001 0 1010.586 10.586z" />
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</svg>
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</span>
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</span>
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</button>
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)
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}
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