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All Rights Reserved.\n// See LICENSE.txt for license information.\n\nimport debounce from 'lodash/debounce';\nimport type {PDFDocumentProxy, PDFPageProxy} from 'pdfjs-dist';\nimport * as pdfjsLib from 'pdfjs-dist/legacy/build/pdf.mjs';\nimport 'pdfjs-dist/build/pdf.worker.min.mjs';\nimport type {RenderParameters} from 'pdfjs-dist/types/src/display/api';\nimport React from 'react';\n\nimport type {FileInfo} from '@mattermost/types/files';\n\nimport {getFileDownloadUrl} from 'mattermost-redux/utils/file_utils';\n\nimport FileInfoPreview from 'components/file_info_preview';\nimport LoadingSpinner from 'components/widgets/loading/loading_spinner';\n\nimport {getSiteURL} from 'utils/url';\n\nconst INITIAL_RENDERED_PAGES = 3;\n\nexport type Props = {\n\n /**\n * Compare file types\n */\n fileInfo: FileInfo;\n\n /**\n * URL of pdf file to output and compare to update props url\n */\n fileUrl: string;\n scale: number;\n handleBgClose: (e: React.MouseEvent<Element, MouseEvent>) => void;\n}\n\ntype State = {\n pdf: PDFDocumentProxy | null;\n pdfPages: Record<number, PDFPageProxy>;\n pdfPagesLoaded: Record<number, boolean>;\n numPages: number;\n loading: boolean;\n success: boolean;\n prevFileUrl: string;\n}\n\nexport default class PDFPreview extends React.PureComponent<Props, State> {\n public pdfPagesRendered: Record<number, boolean>;\n public container: React.RefObject<HTMLDivElement>;\n public parentNode: HTMLElement|null = null;\n public pdfCanvasRef: {[key: string]: React.RefObject<HTMLCanvasElement>} = {};\n\n constructor(props: Props) {\n super(props);\n\n this.pdfPagesRendered = {};\n this.container = React.createRef();\n\n this.state = {\n pdf: null,\n pdfPages: [],\n pdfPagesLoaded: {},\n numPages: 0,\n loading: true,\n success: false,\n prevFileUrl: '',\n };\n }\n\n componentDidMount() {\n this.getPdfDocument();\n if (this.container.current) {\n this.parentNode = this.container.current.parentElement;\n this.parentNode?.addEventListener('scroll', this.handleScroll);\n }\n }\n\n componentWillUnmount() {\n if (this.parentNode) {\n this.parentNode.removeEventListener('scroll', this.handleScroll);\n }\n }\n\n static getDerivedStateFromProps(props: Props, state: State) {\n if (props.fileUrl !== state.prevFileUrl) {\n return {\n pdf: null,\n pdfPages: {},\n pdfPagesLoaded: {},\n numPages: 0,\n loading: true,\n success: false,\n prevFileUrl: props.fileUrl,\n };\n }\n return null;\n }\n\n componentDidUpdate(prevProps: Props, prevState: State) {\n if (this.props.fileUrl !== prevProps.fileUrl) {\n this.getPdfDocument();\n this.pdfPagesRendered = {};\n }\n if (this.props.scale !== prevProps.scale) {\n this.pdfPagesRendered = {};\n if (this.state.success) {\n for (let i = 0; i < this.state.numPages; i++) {\n this.renderPDFPage(i);\n }\n }\n }\n\n if (!prevState.success && this.state.success) {\n for (let i = 0; i < this.state.numPages; i++) {\n this.renderPDFPage(i);\n }\n }\n }\n\n downloadFile = (e: React.FormEvent) => {\n const fileDownloadUrl = this.props.fileInfo.link || getFileDownloadUrl(this.props.fileInfo.id);\n e.preventDefault();\n window.location.href = fileDownloadUrl;\n };\n\n isInViewport = (page: Element) => {\n const bounding = page.getBoundingClientRect();\n const viewportTop = this.container.current?.scrollTop ?? 0;\n const viewportBottom = viewportTop + (this.parentNode?.clientHeight ?? 0);\n return (\n (bounding.top >= viewportTop && bounding.top <= viewportBottom) ||\n (bounding.bottom >= viewportTop && bounding.bottom <= viewportBottom) ||\n (bounding.top <= viewportTop && bounding.bottom >= viewportBottom)\n );\n };\n\n renderPDFPage = async (pageIndex: number) => {\n const canvas = this.pdfCanvasRef[`pdfCanvasRef-${pageIndex}`].current;\n if (!canvas) {\n // Refs are undefined when testing\n return;\n }\n\n // Always render the first INITIAL_RENDERED_PAGES pages to avoid\n // problems detecting isInViewport during the open animation\n if (pageIndex >= INITIAL_RENDERED_PAGES && !this.isInViewport(canvas)) {\n return;\n }\n\n if (this.pdfPagesRendered[pageIndex]) {\n return;\n }\n\n const page = await this.loadPage(this.state.pdf!, pageIndex);\n const context = canvas.getContext('2d');\n const viewport = page.getViewport({scale: this.props.scale});\n canvas.height = viewport.height;\n canvas.width = viewport.width;\n\n const renderContext = {\n canvasContext: context as object,\n viewport,\n } as RenderParameters;\n\n await page.render(renderContext).promise;\n this.pdfPagesRendered[pageIndex] = true;\n };\n\n getPdfDocument = async () => {\n try {\n const pdf = await pdfjsLib.getDocument({\n url: this.props.fileUrl,\n cMapUrl: getSiteURL() + '/static/cmaps/',\n cMapPacked: true,\n }).promise;\n this.onDocumentLoad(pdf);\n } catch (err) {\n this.onDocumentLoadError(err);\n }\n };\n\n onDocumentLoad = (pdf: PDFDocumentProxy) => {\n this.setState({pdf, numPages: pdf.numPages});\n for (let i = 0; i < pdf.numPages; i++) {\n this.pdfCanvasRef[`pdfCanvasRef-${i}`] = React.createRef();\n }\n this.setState({loading: false, success: true});\n };\n\n onDocumentLoadError = (reason: string) => {\n console.log('Unable to load PDF preview: ' + reason); //eslint-disable-line no-console\n this.setState({loading: false, success: false});\n };\n\n loadPage = async (pdf: PDFDocumentProxy, pageIndex: number) => {\n if (this.state.pdfPagesLoaded[pageIndex]) {\n return this.state.pdfPages[pageIndex];\n }\n\n const page = await pdf.getPage(pageIndex + 1);\n\n const pdfPages = Object.assign({}, this.state.pdfPages);\n pdfPages[pageIndex] = page;\n\n const pdfPagesLoaded = Object.assign({}, this.state.pdfPagesLoaded);\n pdfPagesLoaded[pageIndex] = true;\n this.setState({pdfPages, pdfPagesLoaded});\n\n return page;\n };\n\n handleScroll = debounce(() => {\n if (this.state.success) {\n for (let i = 0; i < this.state.numPages; i++) {\n this.renderPDFPage(i);\n }\n }\n }, 100);\n\n render() {\n if (this.state.loading) {\n return (\n <div\n ref={this.container}\n className='view-image__loading'\n >\n <LoadingSpinner/>\n </div>\n );\n }\n\n if (!this.state.success) {\n return (\n <FileInfoPreview\n fileInfo={this.props.fileInfo}\n fileUrl={this.props.fileUrl}\n />\n );\n }\n\n const pdfCanvases = [];\n for (let i = 0; i < this.state.numPages; i++) {\n pdfCanvases.push(\n <canvas\n ref={this.pdfCanvasRef[`pdfCanvasRef-${i}`]}\n key={'previewpdfcanvas' + i}\n />,\n );\n\n if (i < this.state.numPages - 1 && this.state.numPages > 1) {\n pdfCanvases.push(\n <div\n key={'previewpdfspacer' + i}\n className='pdf-preview-spacer'\n />,\n );\n }\n }\n\n return (\n <div\n ref={this.container}\n className='post-code'\n onClick={this.props.handleBgClose}\n >\n {pdfCanvases}\n </div>\n );\n }\n}\n"],"names":["PDFPreview","React","constructor","props","super","_defineProperty","e","fileDownloadUrl","this","fileInfo","link","getFileDownloadUrl","id","preventDefault","window","location","href","page","_this$container$curre","_this$container$curre2","_this$parentNode$clie","_this$parentNode","bounding","getBoundingClientRect","viewportTop","container","current","scrollTop","viewportBottom","parentNode","clientHeight","top","bottom","async","canvas","pdfCanvasRef","concat","pageIndex","isInViewport","pdfPagesRendered","loadPage","state","pdf","context","getContext","viewport","getViewport","scale","height","width","renderContext","canvasContext","render","promise","pdfjsLib","url","fileUrl","cMapUrl","getSiteURL","cMapPacked","onDocumentLoad","err","onDocumentLoadError","setState","numPages","i","loading","success","reason","console","log","pdfPagesLoaded","pdfPages","getPage","Object","assign","debounce","renderPDFPage","prevFileUrl","componentDidMount","_this$parentNode2","getPdfDocument","parentElement","addEventListener","handleScroll","componentWillUnmount","removeEventListener","getDerivedStateFromProps","componentDidUpdate","prevProps","prevState","ref","className","LoadingSpinner","FileInfoPreview","pdfCanvases","push","key","onClick","handleBgClose","_pt","isRequired"],"sourceRoot":""}
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