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Added synced scrolling (#386)

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Signed-off-by: Tilman Vatteroth <tilman.vatteroth@tu-dortmund.de>
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mrdrogdrog 2020-08-19 23:01:38 +02:00 • committed by GitHub
parent 164b5436ae
commit 73007ef597
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10 changed files with 413 additions and 38 deletions
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72
src/components/markdown-renderer/markdown-renderer.tsx
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@ -21,11 +21,12 @@ import subscript from 'markdown-it-sub'
import superscript from 'markdown-it-sup'
import taskList from 'markdown-it-task-lists'
import toc from 'markdown-it-toc-done-right'
import React, { ReactElement, useEffect, useMemo, useRef, useState } from 'react'
import React, { ReactElement, useCallback, useEffect, useMemo, useRef, useState } from 'react'
import { Alert } from 'react-bootstrap'
import ReactHtmlParser, { convertNodeToElement, Transform } from 'react-html-parser'
import { Trans } from 'react-i18next'
import MathJaxReact from 'react-mathjax'
import useResizeObserver from 'use-resize-observer'
import { useSelector } from 'react-redux'
import { TocAst } from '../../external-types/markdown-it-toc-done-right/interface'
import { ApplicationState } from '../../redux'
@ -65,6 +66,12 @@ import { QuoteOptionsReplacer } from './replace-components/quote-options/quote-o
import { TocReplacer } from './replace-components/toc/toc-replacer'
import { VimeoReplacer } from './replace-components/vimeo/vimeo-replacer'
import { YoutubeReplacer } from './replace-components/youtube/youtube-replacer'
import { lineNumberMarker } from '../editor/markdown-renderer/markdown-it-plugins/line-number-marker'
export interface LineMarkerPosition {
line: number
position: number
}
export interface MarkdownRendererProps {
content: string
@ -73,6 +80,7 @@ export interface MarkdownRendererProps {
onTocChange?: (ast: TocAst) => void
onMetaDataChange?: (yamlMetaData: YAMLMetaData | undefined) => void
onFirstHeadingChange?: (firstHeading: string | undefined) => void
onLineMarkerPositionChanged?: (lineMarkerPosition: LineMarkerPosition[]) => void
}
const markdownItTwitterEmojis = Object.keys((emojiData as unknown as Data).emojis)
@ -102,14 +110,41 @@ const forkAwesomeIconMap = Object.keys(ForkAwesomeIcons)
return reduceObject
}, {} as { [key: string]: string })
export const MarkdownRenderer: React.FC<MarkdownRendererProps> = ({ content, onMetaDataChange, onFirstHeadingChange, onTocChange, className, wide }) => {
export const MarkdownRenderer: React.FC<MarkdownRendererProps> = ({ content, onMetaDataChange, onFirstHeadingChange, onTocChange, className, wide, onLineMarkerPositionChanged }) => {
const [tocAst, setTocAst] = useState<TocAst>()
const [lastTocAst, setLastTocAst] = useState<TocAst>()
const lastTocAst = useRef<TocAst>()
const [yamlError, setYamlError] = useState(false)
const rawMetaRef = useRef<RawYAMLMetadata>()
const oldMetaRef = useRef<RawYAMLMetadata>()
const firstHeadingRef = useRef<string>()
const oldFirstHeadingRef = useRef<string>()
const documentElement = useRef<HTMLDivElement>(null)
const lastLineMarkerPositions = useRef<LineMarkerPosition[]>()
const calculateLineMarkerPositions = useCallback(() => {
if (documentElement.current && onLineMarkerPositionChanged) {
const lineMarkers: NodeListOf<HTMLDivElement> = documentElement.current.querySelectorAll('codimd-linemarker')
const lineMarkerPositions: LineMarkerPosition[] = Array.from(lineMarkers).map((marker) => {
return {
line: Number(marker.getAttribute('data-linenumber')),
position: marker.offsetTop
} as LineMarkerPosition
})
if (!equal(lineMarkerPositions, lastLineMarkerPositions.current)) {
lastLineMarkerPositions.current = lineMarkerPositions
onLineMarkerPositionChanged(lineMarkerPositions)
}
}
}, [onLineMarkerPositionChanged])
useEffect(() => {
calculateLineMarkerPositions()
}, [calculateLineMarkerPositions])
useResizeObserver({
ref: documentElement,
onResize: () => calculateLineMarkerPositions()
})
useEffect(() => {
if (onMetaDataChange && !equal(oldMetaRef.current, rawMetaRef.current)) {
@ -239,6 +274,7 @@ export const MarkdownRenderer: React.FC<MarkdownRendererProps> = ({ content, onM
slugify: slugify
})
md.use(linkifyExtra)
md.use(lineNumberMarker())
if (process.env.NODE_ENV !== 'production') {
md.use(MarkdownItParserDebugger)
}
@ -251,11 +287,11 @@ export const MarkdownRenderer: React.FC<MarkdownRendererProps> = ({ content, onM
}, [onMetaDataChange, onFirstHeadingChange, plantumlServer])
useEffect(() => {
if (onTocChange && tocAst && !equal(tocAst, lastTocAst)) {
if (onTocChange && tocAst && !equal(tocAst, lastTocAst.current)) {
lastTocAst.current = tocAst
onTocChange(tocAst)
setLastTocAst(tocAst)
}
}, [tocAst, onTocChange, lastTocAst])
}, [tocAst, onTocChange])
const tryToReplaceNode = (node: DomElement, index: number, allReplacers: ComponentReplacer[], nodeConverter: SubNodeConverter) => {
return allReplacers
@ -291,17 +327,19 @@ export const MarkdownRenderer: React.FC<MarkdownRendererProps> = ({ content, onM
}, [content, markdownIt, onMetaDataChange])
return (
<div className={`markdown-body ${className || ''} d-flex flex-column align-items-center ${wide ? 'wider' : ''}`}>
<ShowIf condition={yamlError}>
<Alert variant='warning' dir='auto'>
<Trans i18nKey='editor.invalidYaml'>
<InternalLink text='yaml-metadata' href='/n/yaml-metadata' className='text-dark'/>
</Trans>
</Alert>
</ShowIf>
<MathJaxReact.Provider>
{result}
</MathJaxReact.Provider>
<div className={'bg-light flex-fill pb-5'}>
<div className={`markdown-body ${className || ''} d-flex flex-column align-items-center ${wide ? 'wider' : ''}`} ref={documentElement}>
<ShowIf condition={yamlError}>
<Alert variant='warning' dir='auto'>
<Trans i18nKey='editor.invalidYaml'>
<InternalLink text='yaml-metadata' href='/n/yaml-metadata' className='text-dark'/>
</Trans>
</Alert>
</ShowIf>
<MathJaxReact.Provider>
{result}
</MathJaxReact.Provider>
</div>
</div>
)
}