mirror of
https://github.com/overleaf/overleaf.git
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65b0fd73ea
* Improve "compile" keypress handling * Remove "compile" keypress handling from PDF preview * Remove compile shortcuts from CM6 * Use an event for Vim keybindings * Remove event handlers from Angular/Ace * Move useCompileTriggers into DetachCompileProvider GitOrigin-RevId: 7f0e667b5106a849458e06ebb0f7a413d5d63430
417 lines
12 KiB
JavaScript
417 lines
12 KiB
JavaScript
import PropTypes from 'prop-types'
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import { memo, useCallback, useEffect, useRef, useState } from 'react'
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import { debounce } from 'lodash'
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import PdfViewerControls from './pdf-viewer-controls'
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import { useProjectContext } from '../../../shared/context/project-context'
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import usePersistedState from '../../../shared/hooks/use-persisted-state'
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import { buildHighlightElement } from '../util/highlights'
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import PDFJSWrapper from '../util/pdf-js-wrapper'
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import withErrorBoundary from '../../../infrastructure/error-boundary'
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import PdfPreviewErrorBoundaryFallback from './pdf-preview-error-boundary-fallback'
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import { useDetachCompileContext as useCompileContext } from '../../../shared/context/detach-compile-context'
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import { captureException } from '../../../infrastructure/error-reporter'
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import { getPdfCachingMetrics } from '../util/metrics'
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function PdfJsViewer({ url, pdfFile }) {
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const { _id: projectId } = useProjectContext()
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const { setError, firstRenderDone, highlights, position, setPosition } =
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useCompileContext()
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// state values persisted in localStorage to restore on load
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const [scale, setScale] = usePersistedState(
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`pdf-viewer-scale:${projectId}`,
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'page-width'
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)
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// local state values
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const [pdfJsWrapper, setPdfJsWrapper] = useState()
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const [initialised, setInitialised] = useState(false)
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// create the viewer when the container is mounted
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const handleContainer = useCallback(
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parent => {
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if (parent) {
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const wrapper = new PDFJSWrapper(parent.firstChild)
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wrapper
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.init()
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.then(() => {
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setPdfJsWrapper(wrapper)
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})
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.catch(error => {
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setError('pdf-viewer-loading-error')
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captureException(error)
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})
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return () => {
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setPdfJsWrapper(null)
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wrapper.destroy()
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}
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}
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},
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[setError]
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)
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const [startFetch, setStartFetch] = useState(0)
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// listen for events and trigger rendering.
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// Do everything in one effect to mitigate de-sync between events.
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useEffect(() => {
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if (!pdfJsWrapper || !firstRenderDone) return
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let timePDFFetched
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let timePDFRendered
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const submitLatencies = () => {
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if (!timePDFFetched) {
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// The pagerendered event was attached after pagesinit fired. :/
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return
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}
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const latencyFetch = Math.ceil(timePDFFetched - startFetch)
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let latencyRender
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if (timePDFRendered) {
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// The renderer does not yield in case the browser tab is hidden.
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// It will yield when the browser tab is visible again.
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// This will skew our performance metrics for rendering!
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// We are omitting the render time in case we detect this state.
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latencyRender = Math.ceil(timePDFRendered - timePDFFetched)
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}
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firstRenderDone({
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latencyFetch,
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latencyRender,
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// Let the pdfCachingMetrics round trip to account for pdf-detach.
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pdfCachingMetrics: getPdfCachingMetrics(),
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})
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}
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const handlePagesinit = () => {
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setInitialised(true)
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timePDFFetched = performance.now()
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if (document.hidden) {
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// Rendering does not start in case we are hidden. See comment above.
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submitLatencies()
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}
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}
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const handleRendered = () => {
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if (!document.hidden) {
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// The render time is not accurate in case we are hidden. See above.
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timePDFRendered = performance.now()
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}
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submitLatencies()
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// Only get the times for the first page.
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pdfJsWrapper.eventBus.off('pagerendered', handleRendered)
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}
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// `pagesinit` fires when the data for rendering the first page is ready.
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pdfJsWrapper.eventBus.on('pagesinit', handlePagesinit)
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// `pagerendered` fires when a page was actually rendered.
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pdfJsWrapper.eventBus.on('pagerendered', handleRendered)
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return () => {
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pdfJsWrapper.eventBus.off('pagesinit', handlePagesinit)
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pdfJsWrapper.eventBus.off('pagerendered', handleRendered)
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}
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}, [pdfJsWrapper, firstRenderDone, startFetch])
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// load the PDF document from the URL
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useEffect(() => {
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if (pdfJsWrapper && url) {
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setInitialised(false)
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setError(undefined)
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setStartFetch(performance.now())
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const abortController = new AbortController()
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const handleFetchError = err => {
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if (abortController.signal.aborted) return
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// The error is already logged at the call-site with additional context.
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if (err instanceof pdfJsWrapper.PDFJS.MissingPDFException) {
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setError('rendering-error-expected')
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} else {
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setError('rendering-error')
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}
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}
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pdfJsWrapper
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.loadDocument({ url, pdfFile, abortController, handleFetchError })
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.catch(error => {
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if (abortController.signal.aborted) return
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console.error(error)
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setError('rendering-error')
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})
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return () => {
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abortController.abort()
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pdfJsWrapper.abortDocumentLoading()
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}
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}
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}, [pdfJsWrapper, url, pdfFile, setError, setStartFetch])
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// listen for scroll events
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useEffect(() => {
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let storePositionTimer
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if (initialised && pdfJsWrapper) {
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if (!pdfJsWrapper.isVisible()) {
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return
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}
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// store the scroll position in localStorage, for the synctex button
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const storePosition = debounce(pdfViewer => {
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// set position for "sync to code" button
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try {
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setPosition(pdfViewer.currentPosition)
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} catch (error) {
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// console.error(error)
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}
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}, 500)
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storePositionTimer = window.setTimeout(() => {
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storePosition(pdfJsWrapper)
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}, 100)
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const scrollListener = () => {
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storePosition(pdfJsWrapper)
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}
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pdfJsWrapper.container.addEventListener('scroll', scrollListener)
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return () => {
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pdfJsWrapper.container.removeEventListener('scroll', scrollListener)
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if (storePositionTimer) {
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window.clearTimeout(storePositionTimer)
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}
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storePosition.cancel()
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}
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}
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}, [setPosition, pdfJsWrapper, initialised])
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// listen for double-click events
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useEffect(() => {
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if (pdfJsWrapper) {
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const handleTextlayerrendered = textLayer => {
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const pageElement = textLayer.source.textLayerDiv.closest('.page')
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if (!pageElement.dataset.listeningForDoubleClick) {
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pageElement.dataset.listeningForDoubleClick = true
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const doubleClickListener = event => {
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const clickPosition = pdfJsWrapper.clickPosition(
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event,
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pageElement,
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textLayer
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)
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if (clickPosition) {
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window.dispatchEvent(
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new CustomEvent('synctex:sync-to-position', {
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detail: clickPosition,
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})
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)
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}
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}
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pageElement.addEventListener('dblclick', doubleClickListener)
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}
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}
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pdfJsWrapper.eventBus.on('textlayerrendered', handleTextlayerrendered)
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return () =>
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pdfJsWrapper.eventBus.off('textlayerrendered', handleTextlayerrendered)
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}
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}, [pdfJsWrapper])
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// restore the saved scale and scroll position
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const positionRef = useRef(position)
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useEffect(() => {
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positionRef.current = position
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}, [position])
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const scaleRef = useRef(scale)
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useEffect(() => {
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scaleRef.current = scale
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}, [scale])
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useEffect(() => {
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if (initialised && pdfJsWrapper) {
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if (!pdfJsWrapper.isVisible()) {
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return
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}
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if (positionRef.current) {
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pdfJsWrapper.scrollToPosition(positionRef.current, scaleRef.current)
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} else {
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pdfJsWrapper.viewer.currentScaleValue = scaleRef.current
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}
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}
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}, [initialised, pdfJsWrapper, scaleRef, positionRef])
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// transmit scale value to the viewer when it changes
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useEffect(() => {
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if (pdfJsWrapper) {
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pdfJsWrapper.viewer.currentScaleValue = scale
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}
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}, [scale, pdfJsWrapper])
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// when highlights are created, build the highlight elements
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useEffect(() => {
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const timers = []
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let intersectionObserver
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if (pdfJsWrapper && highlights?.length) {
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// watch for the highlight elements to scroll into view
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intersectionObserver = new IntersectionObserver(
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entries => {
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for (const entry of entries) {
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if (entry.isIntersecting) {
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intersectionObserver.unobserve(entry.target)
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// fade the element in and out
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entry.target.style.opacity = '0.5'
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timers.push(
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window.setTimeout(() => {
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entry.target.style.opacity = '0'
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}, 1000)
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)
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}
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}
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},
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{
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threshold: 1.0, // the whole element must be visible
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}
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)
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const elements = []
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for (const highlight of highlights) {
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try {
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const element = buildHighlightElement(highlight, pdfJsWrapper)
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elements.push(element)
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intersectionObserver.observe(element)
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} catch (error) {
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// ignore invalid highlights
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}
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}
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const [firstElement] = elements
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if (firstElement) {
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// scroll to the first highlighted element
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firstElement.scrollIntoView({
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block: 'center',
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inline: 'start',
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behavior: 'smooth',
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})
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}
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return () => {
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for (const timer of timers) {
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window.clearTimeout(timer)
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}
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for (const element of elements) {
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element.remove()
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}
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intersectionObserver?.disconnect()
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}
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}
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}, [highlights, pdfJsWrapper])
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// set the scale in response to zoom option changes
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const setZoom = useCallback(
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zoom => {
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switch (zoom) {
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case 'fit-width':
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setScale('page-width')
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break
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case 'fit-height':
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setScale('page-height')
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break
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case 'zoom-in':
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if (pdfJsWrapper) {
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setScale(pdfJsWrapper.viewer.currentScale * 1.25)
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}
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break
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case 'zoom-out':
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if (pdfJsWrapper) {
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setScale(pdfJsWrapper.viewer.currentScale * 0.75)
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}
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break
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}
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},
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[pdfJsWrapper, setScale]
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)
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// adjust the scale when the container is resized
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useEffect(() => {
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if (pdfJsWrapper && 'ResizeObserver' in window) {
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const resizeListener = () => {
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pdfJsWrapper.updateOnResize()
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}
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const resizeObserver = new ResizeObserver(resizeListener)
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resizeObserver.observe(pdfJsWrapper.container)
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window.addEventListener('resize', resizeListener)
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return () => {
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resizeObserver.disconnect()
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window.removeEventListener('resize', resizeListener)
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}
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}
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}, [pdfJsWrapper])
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const handleKeyDown = useCallback(
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event => {
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if (!initialised) {
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return
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}
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if (event.metaKey || event.ctrlKey) {
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switch (event.key) {
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case '=':
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event.preventDefault()
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setZoom('zoom-in')
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break
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case '-':
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event.preventDefault()
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setZoom('zoom-out')
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break
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case '0':
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event.preventDefault()
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setZoom('fit-width')
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break
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}
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}
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},
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[initialised, setZoom]
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)
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/* eslint-disable jsx-a11y/no-noninteractive-tabindex */
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/* eslint-disable jsx-a11y/no-noninteractive-element-interactions */
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return (
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<div className="pdfjs-viewer pdfjs-viewer-outer" ref={handleContainer}>
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<div
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className="pdfjs-viewer-inner"
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role="tabpanel"
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tabIndex="0"
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onKeyDown={handleKeyDown}
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>
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<div className="pdfViewer" />
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</div>
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<div className="pdfjs-controls">
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<PdfViewerControls setZoom={setZoom} />
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</div>
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</div>
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)
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}
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PdfJsViewer.propTypes = {
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url: PropTypes.string.isRequired,
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pdfFile: PropTypes.object,
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}
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export default withErrorBoundary(memo(PdfJsViewer), () => (
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<PdfPreviewErrorBoundaryFallback type="pdf" />
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))
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