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77 changes: 77 additions & 0 deletions
77
packages/docusaurus-theme-classic/src/theme/hooks/useTOCHighlight.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,77 @@ | ||
| /** | ||
| * Copyright (c) 2017-present, Facebook, Inc. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| */ | ||
|
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| import {useEffect, useState} from 'react'; | ||
|
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| function useTOCHighlight(linkClassName, linkActiveClassName, topOffset) { | ||
| const [lastActiveLink, setLastActiveLink] = useState(undefined); | ||
|
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| useEffect(() => { | ||
| let headersAnchors = []; | ||
| let links = []; | ||
|
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| function setActiveLink() { | ||
| function getActiveHeaderAnchor() { | ||
| let index = 0; | ||
| let activeHeaderAnchor = null; | ||
|
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| headersAnchors = document.getElementsByClassName('anchor'); | ||
| while (index < headersAnchors.length && !activeHeaderAnchor) { | ||
| const headerAnchor = headersAnchors[index]; | ||
| const {top} = headerAnchor.getBoundingClientRect(); | ||
|
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| if (top >= 0 && top <= topOffset) { | ||
| activeHeaderAnchor = headerAnchor; | ||
| } | ||
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| index += 1; | ||
| } | ||
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| return activeHeaderAnchor; | ||
| } | ||
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| const activeHeaderAnchor = getActiveHeaderAnchor(); | ||
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| if (activeHeaderAnchor) { | ||
| let index = 0; | ||
| let itemHighlighted = false; | ||
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| links = document.getElementsByClassName(linkClassName); | ||
| while (index < links.length && !itemHighlighted) { | ||
| const link = links[index]; | ||
| const {href} = link; | ||
| const anchorValue = decodeURIComponent( | ||
| href.substring(href.indexOf('#') + 1), | ||
| ); | ||
|
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| if (activeHeaderAnchor.id === anchorValue) { | ||
| if (lastActiveLink) { | ||
| lastActiveLink.classList.remove(linkActiveClassName); | ||
| } | ||
| link.classList.add(linkActiveClassName); | ||
| setLastActiveLink(link); | ||
| itemHighlighted = true; | ||
| } | ||
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| index += 1; | ||
| } | ||
| } | ||
| } | ||
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| document.addEventListener('scroll', setActiveLink); | ||
| document.addEventListener('resize', setActiveLink); | ||
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| setActiveLink(); | ||
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| return () => { | ||
| document.removeEventListener('scroll', setActiveLink); | ||
| document.removeEventListener('resize', setActiveLink); | ||
| }; | ||
| }); | ||
| } | ||
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| export default useTOCHighlight; |
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