overleaf/services/web/frontend/js/features/outline/components/outline-item.js

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import React, { useState, useEffect, createRef, useRef } from 'react'
import PropTypes from 'prop-types'
import scrollIntoViewIfNeeded from 'scroll-into-view-if-needed'
import classNames from 'classnames'
import { useTranslation } from 'react-i18next'
import OutlineList from './outline-list'
import Icon from '../../../shared/components/icon'
function getChildrenLines(children) {
return (children || [])
.map(child => {
return getChildrenLines(child.children).concat(child.line)
})
.flat()
}
function OutlineItem({ outlineItem, jumpToLine, highlightedLine }) {
const { t } = useTranslation()
const [expanded, setExpanded] = useState(true)
const titleElementRef = createRef()
const isHighlightedRef = useRef(false)
const mainItemClasses = classNames('outline-item', {
'outline-item-no-children': !outlineItem.children
})
const hasHighlightedChild =
!expanded &&
getChildrenLines(outlineItem.children).includes(highlightedLine)
const isHighlighted =
highlightedLine === outlineItem.line || hasHighlightedChild
const itemLinkClasses = classNames('outline-item-link', {
'outline-item-link-highlight': isHighlighted
})
function handleExpandCollapseClick() {
setExpanded(!expanded)
}
function handleOutlineItemLinkClick() {
jumpToLine(outlineItem.line, false)
}
function handleOutlineItemLinkDoubleClick() {
jumpToLine(outlineItem.line, true)
}
useEffect(
() => {
const wasHighlighted = isHighlightedRef.current
isHighlightedRef.current = isHighlighted
if (!wasHighlighted && isHighlighted) {
scrollIntoViewIfNeeded(titleElementRef.current, {
scrollMode: 'if-needed',
block: 'center'
})
}
},
[isHighlighted, titleElementRef, isHighlightedRef]
)
// don't set the aria-expanded attribute when there are no children
const ariaExpandedValue = outlineItem.children ? expanded : undefined
return (
<li
className={mainItemClasses}
aria-expanded={ariaExpandedValue}
role="treeitem"
aria-current={isHighlighted}
aria-label={outlineItem.title}
>
<div className="outline-item-row">
{outlineItem.children ? (
<button
className="outline-item-expand-collapse-btn"
onClick={handleExpandCollapseClick}
aria-label={expanded ? t('collapse') : t('expand')}
>
<Icon
type={expanded ? 'angle-down' : 'angle-right'}
classes={{ icon: 'outline-caret-icon' }}
/>
</button>
) : null}
<button
className={itemLinkClasses}
onClick={handleOutlineItemLinkClick}
onDoubleClick={handleOutlineItemLinkDoubleClick}
ref={titleElementRef}
>
{outlineItem.title}
</button>
</div>
{expanded && outlineItem.children ? (
<OutlineList
outline={outlineItem.children}
jumpToLine={jumpToLine}
isRoot={false}
highlightedLine={highlightedLine}
/>
) : null}
</li>
)
}
OutlineItem.propTypes = {
outlineItem: PropTypes.exact({
line: PropTypes.number.isRequired,
title: PropTypes.string.isRequired,
level: PropTypes.number,
children: PropTypes.array
}).isRequired,
jumpToLine: PropTypes.func.isRequired,
highlightedLine: PropTypes.number
}
export default OutlineItem