File size: 2,349 Bytes
1e92f2d | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 | import { useRef, WheelEvent } from 'react'
import {
animated,
useIsomorphicLayoutEffect,
useSprings,
} from '@react-spring/web'
import { SubtitleSchemaItem } from '../../../scripts/docs/navigation'
import clsx from 'clsx'
import {
gradientLeft,
gradientRight,
subNavAnchor,
subNavContainer,
subNavList,
subNavListItem,
subNavScroller,
} from './HeaderSubnav.css'
interface HeaderSubnavProps {
className?: string
subnav: SubtitleSchemaItem
}
export const HeaderSubnav = ({ className, subnav }: HeaderSubnavProps) => {
const subNavScrollRef = useRef<HTMLDivElement>(null!)
const [springs, ref] = useSprings(2, () => ({
opacity: 0,
}))
const handleScroll = (e: WheelEvent<HTMLDivElement>) => {
const el = e.target as HTMLDivElement
if (el.scrollLeft === el.scrollWidth - el.clientWidth) {
ref.start(i => ({
opacity: Number(!i),
}))
} else if (el.scrollLeft === 0) {
ref.start(i => ({
opacity: i,
}))
} else {
ref.start(() => ({
opacity: 1,
}))
}
}
useIsomorphicLayoutEffect(() => {
const handleResize = () => {
const el = subNavScrollRef.current
if (el.scrollWidth > el.clientWidth && el.scrollLeft === 0) {
ref.start(i => ({
opacity: i,
immediate: true,
}))
} else if (el.scrollLeft > 0) {
handleScroll({ target: el } as unknown as WheelEvent<HTMLDivElement>)
} else {
ref.start(() => ({
opacity: 0,
}))
}
}
handleResize()
window.addEventListener('resize', handleResize)
return () => {
window.removeEventListener('resize', handleResize)
}
}, [])
return (
<nav className={clsx(subNavContainer, className)}>
<animated.div className={gradientLeft} style={{ ...springs[0] }} />
<div
className={subNavScroller}
ref={subNavScrollRef}
onScroll={handleScroll}
>
<ul className={subNavList}>
{subnav.map(({ href, label, id }) => (
<li className={subNavListItem} key={id}>
<a className={subNavAnchor} href={href}>
{label}
</a>
</li>
))}
</ul>
</div>
<animated.div className={gradientRight} style={{ ...springs[1] }} />
</nav>
)
}
|