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import { useCallback, useEffect, useRef, useState } from 'react'
import Logo from './Logo'
import throttle from 'lodash.throttle'
import RandomPostButton from './RandomPostButton'
import SearchButton from './SearchButton'
import DarkModeButton from './DarkModeButton'
import SlideOver from './SlideOver'
import ReadingProgress from './ReadingProgress'
import { MenuListTop } from './MenuListTop'
import { isBrowser } from '@/lib/utils'
import { siteConfig } from '@/lib/config'
/**
* 顶部导航
* @param {*} param0
* @returns
*/
const NavBar = props => {
const [fixedNav, setFixedNav] = useState(false)
const [textWhite, setTextWhite] = useState(false)
const [navBgWhite, setBgWhite] = useState(false)
const [activeIndex, setActiveIndex] = useState(0)
const slideOverRef = useRef()
const toggleMenuOpen = () => {
slideOverRef?.current?.toggleSlideOvers()
}
/**
* 根据滚动条，切换导航栏样式
*/
const scrollTrigger = useCallback(throttle(() => {
const scrollS = window.scrollY
// 导航栏设置 白色背景
if (scrollS <= 0) {
setFixedNav(false)
setBgWhite(false)
// 文章详情页特殊处理
if (document.querySelector('#post-bg')) {
setFixedNav(true)
setTextWhite(true)
setBgWhite(false)
}
} else {
// 向下滚动后的导航样式
setFixedNav(true)
setTextWhite(false)
setBgWhite(true)
}
}, 200))
// 监听滚动
useEffect(() => {
scrollTrigger()
window.addEventListener('scroll', scrollTrigger)
return () => {
window.removeEventListener('scroll', scrollTrigger)
}
}, [])
// 监听导航栏显示文字
useEffect(() => {
let prevScrollY = 0
let ticking = false
const handleScroll = () => {
if (!ticking) {
window.requestAnimationFrame(() => {
const currentScrollY = window.scrollY
if (currentScrollY > prevScrollY) {
setActiveIndex(1) // 向下滚动时设置activeIndex为1
} else {
setActiveIndex(0) // 向上滚动时设置activeIndex为0
}
prevScrollY = currentScrollY
ticking = false
})
ticking = true
}
}
if (isBrowser) {
window.addEventListener('scroll', handleScroll)
}
return () => {
if (isBrowser) {
window.removeEventListener('scroll', handleScroll)
}
}
}, [])
return (<>
<style jsx>{`
@keyframes fade-in-down {
0% {
opacity: 0.5;
transform: translateY(-30%);
}
100% {
opacity: 1;
transform: translateY(0);
}
}
@keyframes fade-in-up {
0% {
opacity: 0.5;
transform: translateY(30%);
}
100% {
opacity: 1;
transform: translateY(0);
}
}
.fade-in-down {
animation: fade-in-down 0.3s ease-in-out;
}
.fade-in-up {
animation: fade-in-up 0.3s ease-in-out;
}
`}</style>
{/* 顶部导航菜单栏 */}
<nav id='nav' className={`z-20 h-16 top-0 w-full
${fixedNav ? 'fixed' : 'relative bg-transparent'}
${textWhite ? 'text-white ' : 'text-black dark:text-white'}
${navBgWhite ? 'bg-white dark:bg-[#18171d]' : 'bg-transparent'}`}>
<div className='flex h-full mx-auto justify-between items-center max-w-[86rem] px-8'>
{/* 左侧logo */}
<div className='flex'>
<Logo {...props} />
</div>
{/* 中间菜单 */}
<div id='nav-bar-swipe' className={`hidden lg:flex flex-grow flex-col items-center justify-center h-full relative w-full ${activeIndex === 0 ? 'fade-in-down' : 'fade-in-up'}`}>
{activeIndex === 0 && <MenuListTop {...props} />}
{activeIndex === 1 && <h1 className='font-bold text-center text-light-400 dark:text-gray-400'>{siteConfig('AUTHOR') || siteConfig('TITLE')} {siteConfig('BIO') && <>|</>} {siteConfig('BIO')}</h1>}
</div>
{/* 右侧固定 */}
<div className='flex flex-shrink-0 justify-center items-center'>
<RandomPostButton {...props} />
<SearchButton {...props}/>
{!JSON.parse(siteConfig('THEME_SWITCH')) && <div className='hidden md:block'><DarkModeButton {...props} /></div>}
<ReadingProgress />
{/* 移动端菜单按钮 */}
<div onClick={toggleMenuOpen} className='flex lg:hidden w-8 justify-center items-center h-8 cursor-pointer'>
<i className='fas fa-bars' />
</div>
</div>
{/* 右边侧拉抽屉 */}
<SlideOver cRef={slideOverRef} {...props} />
</div>
</nav>
</>)
}
export default NavBar
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