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Wrap markdown rendering in iframe (#837)

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Signed-off-by: Tilman Vatteroth <tilman.vatteroth@tu-dortmund.de>
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Tilman Vatteroth 2021-01-24 20:50:51 +01:00 • committed by GitHub
parent bd31076928
commit 586969f368
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45 changed files with 1014 additions and 287 deletions
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47
src/components/editor/scroll/hooks/use-user-scroll.ts
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@ -1,47 +0,0 @@
/*
* SPDX-FileCopyrightText: 2021 The HedgeDoc developers (see AUTHORS file)
*
* SPDX-License-Identifier: AGPL-3.0-only
*/
import { RefObject, useCallback } from 'react'
import { LineMarkerPosition } from '../../../markdown-renderer/types'
import { ScrollState } from '../scroll-props'
export const useUserScroll = (lineMarks: LineMarkerPosition[] | undefined, renderer: RefObject<HTMLElement>, onScroll: ((newScrollState: ScrollState) => void)|undefined): () => void =>
useCallback(() => {
if (!renderer.current || !lineMarks || lineMarks.length === 0 || !onScroll) {
return
}
const scrollTop = renderer.current.scrollTop
const lineMarksBeforeScrollTop = lineMarks.filter(lineMark => lineMark.position <= scrollTop)
if (lineMarksBeforeScrollTop.length === 0) {
return
}
const lineMarksAfterScrollTop = lineMarks.filter(lineMark => lineMark.position > scrollTop)
if (lineMarksAfterScrollTop.length === 0) {
return
}
const beforeLineMark = lineMarksBeforeScrollTop
.reduce((prevLineMark, currentLineMark) =>
prevLineMark.line >= currentLineMark.line ? prevLineMark : currentLineMark)
const afterLineMark = lineMarksAfterScrollTop
.reduce((prevLineMark, currentLineMark) =>
prevLineMark.line < currentLineMark.line ? prevLineMark : currentLineMark)
const componentHeight = afterLineMark.position - beforeLineMark.position
const distanceToBefore = scrollTop - beforeLineMark.position
const percentageRaw = (distanceToBefore / componentHeight)
const lineCount = afterLineMark.line - beforeLineMark.line
const line = Math.floor(lineCount * percentageRaw + beforeLineMark.line)
const lineHeight = componentHeight / lineCount
const innerScrolling = Math.floor((distanceToBefore % lineHeight) / lineHeight * 100)
const newScrollState: ScrollState = { firstLineInView: line, scrolledPercentage: innerScrolling }
onScroll(newScrollState)
}, [lineMarks, onScroll, renderer])