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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,94 @@ | ||
| import throttle from 'lodash.throttle' | ||
| import { uuidToId } from 'notion-utils' | ||
| import { useCallback, useEffect, useRef, useState } from 'react' | ||
|
|
||
| /** | ||
| * 目录导航组件 | ||
| * @param toc | ||
| * @returns {JSX.Element} | ||
| * @constructor | ||
| */ | ||
| const Catalog = ({ toc }) => { | ||
| // 监听滚动事件 | ||
| useEffect(() => { | ||
| window.addEventListener('scroll', actionSectionScrollSpy) | ||
| actionSectionScrollSpy() | ||
| return () => { | ||
| window.removeEventListener('scroll', actionSectionScrollSpy) | ||
| } | ||
| }, []) | ||
|
|
||
| // 目录自动滚动 | ||
| const tRef = useRef(null) | ||
| const tocIds = [] | ||
|
|
||
| // 同步选中目录事件 | ||
| const [activeSection, setActiveSection] = useState(null) | ||
| const throttleMs = 200 | ||
| const actionSectionScrollSpy = useCallback( | ||
| throttle(() => { | ||
| const sections = document.getElementsByClassName('notion-h') | ||
| let prevBBox = null | ||
| let currentSectionId = activeSection | ||
| for (let i = 0; i < sections.length; ++i) { | ||
| const section = sections[i] | ||
| if (!section || !(section instanceof Element)) continue | ||
| if (!currentSectionId) { | ||
| currentSectionId = section.getAttribute('data-id') | ||
| } | ||
| const bbox = section.getBoundingClientRect() | ||
| const prevHeight = prevBBox ? bbox.top - prevBBox.bottom : 0 | ||
| const offset = Math.max(150, prevHeight / 4) | ||
| // GetBoundingClientRect returns values relative to viewport | ||
| if (bbox.top - offset < 0) { | ||
| currentSectionId = section.getAttribute('data-id') | ||
| prevBBox = bbox | ||
| continue | ||
| } | ||
| // No need to continue loop, if last element has been detected | ||
| break | ||
| } | ||
| setActiveSection(currentSectionId) | ||
| const index = tocIds.indexOf(currentSectionId) || 0 | ||
| tRef?.current?.scrollTo({ top: 28 * index, behavior: 'smooth' }) | ||
| }, throttleMs) | ||
| ) | ||
|
|
||
| // 无目录就直接返回空 | ||
| if (!toc || toc.length < 1) { | ||
| return <></> | ||
| } | ||
|
|
||
| return ( | ||
| <div className='px-3'> | ||
| <div | ||
| className='overflow-y-auto max-h-96 overscroll-none scroll-hidden' | ||
| ref={tRef}> | ||
| <nav className='h-full text-black dark:text-gray-300'> | ||
| {toc.map(tocItem => { | ||
| const id = uuidToId(tocItem.id) | ||
| tocIds.push(id) | ||
| return ( | ||
| <a | ||
| key={id} | ||
| href={`#${id}`} | ||
| className={`notion-table-of-contents-item duration-300 transform font-light | ||
| notion-table-of-contents-item-indent-level-${tocItem.indentLevel} `}> | ||
| <span | ||
| style={{ | ||
| display: 'inline-block', | ||
| marginLeft: tocItem.indentLevel * 16 | ||
| }} | ||
| className={`truncate ${activeSection === id ? ' font-bold text-red-400 underline' : ''}`}> | ||
| {tocItem.text} | ||
| </span> | ||
| </a> | ||
| ) | ||
| })} | ||
| </nav> | ||
| </div> | ||
| </div> | ||
| ) | ||
| } | ||
|
|
||
| export default Catalog |
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