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c443322a41
GitOrigin-RevId: 299ed9d568650ce37edba87643112d1cd6d12fd4
108 lines
3.4 KiB
JavaScript
108 lines
3.4 KiB
JavaScript
import { useState, useEffect, useRef, memo } from 'react'
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import PropTypes from 'prop-types'
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import scrollIntoViewIfNeeded from 'scroll-into-view-if-needed'
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import classNames from 'classnames'
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import OutlineList from './outline-list'
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import { OutlineItemToggleButton } from '@/features/outline/components/outline-item-toggle-button'
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const OutlineItem = memo(function OutlineItem({
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outlineItem,
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jumpToLine,
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highlightedLine,
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matchesHighlightedLine,
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containsHighlightedLine,
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}) {
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const [expanded, setExpanded] = useState(true)
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const titleElementRef = useRef()
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const isHighlightedRef = useRef(false)
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const mainItemClasses = classNames('outline-item', {
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'outline-item-no-children': !outlineItem.children,
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})
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const hasHighlightedChild = !expanded && containsHighlightedLine
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const isHighlighted = matchesHighlightedLine || hasHighlightedChild
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const itemLinkClasses = classNames('outline-item-link', {
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'outline-item-link-highlight': isHighlighted,
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})
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function handleOutlineItemLinkClick(event) {
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const syncToPdf = event.detail === 2 // double-click = sync to PDF
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jumpToLine(outlineItem.line, syncToPdf)
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}
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useEffect(() => {
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const wasHighlighted = isHighlightedRef.current
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isHighlightedRef.current = isHighlighted
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if (!wasHighlighted && isHighlighted) {
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scrollIntoViewIfNeeded(titleElementRef.current, {
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scrollMode: 'if-needed',
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block: 'center',
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})
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}
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}, [isHighlighted, titleElementRef, isHighlightedRef])
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// don't set the aria-expanded attribute when there are no children
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const ariaExpandedValue = outlineItem.children ? expanded : undefined
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return (
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<li
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className={mainItemClasses}
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aria-expanded={ariaExpandedValue}
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// FIXME
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// eslint-disable-next-line jsx-a11y/role-has-required-aria-props
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role="treeitem"
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aria-current={isHighlighted}
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aria-label={outlineItem.title}
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>
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<div className="outline-item-row">
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{!!outlineItem.children && (
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<OutlineItemToggleButton
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expanded={expanded}
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setExpanded={setExpanded}
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/>
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)}
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<button
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className={itemLinkClasses}
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onClick={handleOutlineItemLinkClick}
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ref={titleElementRef}
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>
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{outlineItem.title}
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</button>
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</div>
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{expanded && outlineItem.children ? (
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// highlightedLine is only provided to this list if the list contains
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// the highlighted line. This means that whenever the list does not
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// contain the highlighted line, the props provided to it are the same
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// and the component can be memoized.
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<OutlineList
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outline={outlineItem.children}
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jumpToLine={jumpToLine}
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isRoot={false}
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highlightedLine={containsHighlightedLine ? highlightedLine : null}
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containsHighlightedLine={containsHighlightedLine}
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/>
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) : null}
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</li>
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)
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})
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OutlineItem.propTypes = {
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outlineItem: PropTypes.exact({
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line: PropTypes.number.isRequired,
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title: PropTypes.string.isRequired,
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level: PropTypes.number,
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children: PropTypes.array,
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// Used for caching in CM6
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from: PropTypes.number,
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to: PropTypes.number,
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}).isRequired,
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jumpToLine: PropTypes.func.isRequired,
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highlightedLine: PropTypes.number,
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matchesHighlightedLine: PropTypes.bool,
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containsHighlightedLine: PropTypes.bool,
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}
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export default OutlineItem
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