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import { ArrowSmallUp } from '@/components/HeroIcons'
import { useEffect, useState } from 'react'
/**
* 回顶按钮
* @returns
*/
export default function ReadingProgress() {
const [scrollPercentage, setScrollPercentage] = useState(0)
function handleScroll() {
const scrollHeight = document.documentElement.scrollHeight
const clientHeight = document.documentElement.clientHeight
const scrollY = window.scrollY || window.pageYOffset
const percent = Math.floor((scrollY / (scrollHeight - clientHeight - 20)) * 100)
setScrollPercentage(percent)
}
// 监听滚动事件
useEffect(() => {
let requestId
function updateScrollPercentage() {
handleScroll()
requestId = null
}
function handleAnimationFrame() {
if (requestId) {
return
}
requestId = requestAnimationFrame(updateScrollPercentage)
}
window.addEventListener('scroll', handleAnimationFrame)
return () => {
window.removeEventListener('scroll', handleAnimationFrame)
if (requestId) {
cancelAnimationFrame(requestId)
}
}
}, [])
return (<div
title={'阅读进度'}
onClick={() => window.scrollTo({ top: 0, behavior: 'smooth' })}
className={`${scrollPercentage > 0 ? 'w-10 h-10 ' : 'w-0 h-0 opacity-0'} group cursor-pointer hover:bg-black hover:bg-opacity-10 rounded-full flex justify-center items-center duration-200 transition-all`}
>
<ArrowSmallUp className={'w-5 h-5 hidden group-hover:block'} />
<div className='group-hover:hidden text-xs flex justify-center items-center rounded-full w-6 h-6 bg-black text-white'>
{scrollPercentage < 100 ? scrollPercentage : <ArrowSmallUp className={'w-5 h-5 fill-white'} />}
</div>
</div>
)
}
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