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ngx-extended-pdf-viewer

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Embedding PDF files in your Angular application. Highly configurable viewer including the toolbar, sidebar, and all the features you're used to.

382 lines 58.3 kB
import { Subject } from 'rxjs';
import { NgxExtendedPdfViewerComponent } from './ngx-extended-pdf-viewer.component';
export class NgxExtendedPdfViewerService {
    constructor() {
        this.recalculateSize$ = new Subject();
    }
    findMultiple(text, options = {}) {
        options = {
            ...options,
            findMultipleSearchTexts: true,
        };
        const searchString = text.join('\n') + '\n';
        return this.find(searchString, options);
    }
    find(text, options = {}) {
        if (!NgxExtendedPdfViewerComponent.ngxExtendedPdfViewerInitialized) {
            // tslint:disable-next-line:quotemark
            console.error("The PDF viewer hasn't finished initializing. Please call find() later.");
            return false;
        }
        else {
            const highlightAllCheckbox = document.getElementById('findHighlightAll');
            if (highlightAllCheckbox) {
                highlightAllCheckbox.checked = options.highlightAll || false;
            }
            const findPageRange = document.getElementById('findRange');
            if (findPageRange) {
                findPageRange.value = options.pageRange || '';
            }
            const findCurrentPageCheckbox = document.getElementById('findCurrentPage');
            if (findCurrentPageCheckbox) {
                findCurrentPageCheckbox.checked = options.currentPage || false;
            }
            const matchCaseCheckbox = document.getElementById('findMatchCase');
            if (matchCaseCheckbox) {
                matchCaseCheckbox.checked = options.matchCase || false;
            }
            const entireWordCheckbox = document.getElementById('findEntireWord');
            if (entireWordCheckbox) {
                entireWordCheckbox.checked = options.wholeWords || false;
            }
            const findIgnoreAccentsCheckbox = document.getElementById('findIgnoreAccents');
            if (findIgnoreAccentsCheckbox) {
                findIgnoreAccentsCheckbox.checked = options.ignoreAccents || false;
            }
            const multipleSearchTerms = options.findMultipleSearchTexts || text.includes('\n') || false;
            const findMultipleSearchTextsCheckbox = document.getElementById('findMultipleSearchTexts');
            if (findMultipleSearchTextsCheckbox) {
                findMultipleSearchTextsCheckbox.checked = multipleSearchTerms;
            }
            const individualWordsModeCheckbox = document.getElementById('individualWordsMode');
            if (individualWordsModeCheckbox) {
                individualWordsModeCheckbox.checked = false;
            }
            const fuzzySearchCheckbox = document.getElementById('findFuzzy');
            if (fuzzySearchCheckbox) {
                fuzzySearchCheckbox.checked = options.fuzzySearch || false;
            }
            const inputField = multipleSearchTerms ? document.getElementById('findInputMultiline') : document.getElementById('findInput');
            if (inputField) {
                if (inputField instanceof HTMLTextAreaElement) {
                    inputField.value = text;
                    // todo dirty hack!
                    inputField.classList.remove('hidden');
                    document.getElementById('findInput').classList.add('hidden');
                    document.getElementById('individualWordsModeLabel').classList.remove('hidden');
                    document.getElementById('individualWordsMode').classList.remove('hidden');
                    // end of the dirty hack
                }
                else if (inputField instanceof HTMLInputElement) {
                    inputField.value = text;
                    // todo dirty hack!
                    inputField.classList.remove('hidden');
                    document.getElementById('findInputMultiline').classList.add('hidden');
                    document.getElementById('individualWordsModeLabel').classList.add('hidden');
                    document.getElementById('individualWordsMode').classList.add('hidden');
                    // end of the dirty hack
                }
                inputField.dispatchEvent(new Event('input'));
                return true;
            }
            else {
                // tslint:disable-next-line:quotemark
                console.error("Unexpected error: the input field used to search isn't part of the DOM.");
                return false;
            }
        }
    }
    findNext() {
        if (!NgxExtendedPdfViewerComponent.ngxExtendedPdfViewerInitialized) {
            // tslint:disable-next-line:quotemark
            console.error("The PDF viewer hasn't finished initializing. Please call findNext() later.");
            return false;
        }
        else {
            const button = document.getElementById('findNext');
            if (button) {
                button.click();
                return true;
            }
            return false;
        }
    }
    findPrevious() {
        if (!NgxExtendedPdfViewerComponent.ngxExtendedPdfViewerInitialized) {
            // tslint:disable-next-line:quotemark
            console.error("The PDF viewer hasn't finished initializing. Please call findPrevious() later.");
            return false;
        }
        else {
            const button = document.getElementById('findPrevious');
            if (button) {
                button.click();
                return true;
            }
            return false;
        }
    }
    print(printRange) {
        const PDFViewerApplication = window.PDFViewerApplication;
        const alreadyThere = !!window['isInPDFPrintRange'] && !printRange;
        if (!alreadyThere) {
            if (!printRange) {
                printRange = {};
            }
            this.setPrintRange(printRange);
        }
        window.printPDF();
        if (!alreadyThere) {
            PDFViewerApplication.eventBus.on('afterprint', () => {
                this.removePrintRange();
            });
        }
    }
    removePrintRange() {
        window['isInPDFPrintRange'] = undefined;
        window['filteredPageCount'] = undefined;
    }
    setPrintRange(printRange) {
        const PDFViewerApplication = window.PDFViewerApplication;
        window['isInPDFPrintRange'] = (page) => this.isInPDFPrintRange(page, printRange);
        window['filteredPageCount'] = this.filteredPageCount(PDFViewerApplication.pagesCount, printRange);
    }
    filteredPageCount(pageCount, range) {
        let result = 0;
        for (let page = 1; page <= pageCount; page++) {
            if (this.isInPDFPrintRange(page, range)) {
                result++;
            }
        }
        return result;
    }
    isInPDFPrintRange(pageIndex, printRange) {
        const page = pageIndex + 1;
        if (printRange.from) {
            if (page < printRange.from) {
                return false;
            }
        }
        if (printRange.to) {
            if (page > printRange.to) {
                return false;
            }
        }
        if (printRange.excluded) {
            let e = printRange.excluded;
            if (e.some((p) => p === page)) {
                return false;
            }
        }
        if (printRange.included) {
            if (!printRange.included.some((p) => p === page)) {
                return false;
            }
        }
        return true;
    }
    getPageAsText(pageNumber) {
        const PDFViewerApplication = window.PDFViewerApplication;
        const pdfDocument = PDFViewerApplication.pdfDocument;
        const pagePromise = pdfDocument.getPage(pageNumber);
        const extractTextSnippets = (pdfPage) => new Promise((resolve, reject) => {
            const textSnippets = pdfPage.getTextContent();
            resolve(textSnippets);
        });
        const combineTextSnippets = (textSnippets) => new Promise((resolve, reject) => {
            const text = this.convertTextInfoToText(textSnippets);
            resolve(text);
        });
        return pagePromise.then(extractTextSnippets).then(combineTextSnippets);
    }
    convertTextInfoToText(textInfo) {
        if (!textInfo) {
            return '';
        }
        return textInfo.items.map((info) => info.str).join('');
    }
    getPageAsImage(pageNumber, scale, background, backgroundColorToReplace = '#FFFFFF') {
        const PDFViewerApplication = window.PDFViewerApplication;
        const pdfDocument = PDFViewerApplication.pdfDocument;
        const pagePromise = pdfDocument.getPage(pageNumber);
        const imagePromise = (pdfPage) => new Promise((resolve, reject) => {
            resolve(this.draw(pdfPage, scale, background, backgroundColorToReplace));
        });
        return pagePromise.then(imagePromise);
    }
    draw(pdfPage, scale, background, backgroundColorToReplace = '#FFFFFF') {
        let zoomFactor = 1;
        if (scale.scale) {
            zoomFactor = scale.scale;
        }
        else if (scale.width) {
            zoomFactor = scale.width / pdfPage.getViewport({ scale: 1 }).width;
        }
        else if (scale.height) {
            zoomFactor = scale.height / pdfPage.getViewport({ scale: 1 }).height;
        }
        const viewport = pdfPage.getViewport({
            scale: zoomFactor,
        });
        const { ctx, canvas } = this.getPageDrawContext(viewport.width, viewport.height);
        const drawViewport = viewport.clone();
        const renderContext = {
            canvasContext: ctx,
            viewport: drawViewport,
            background,
            backgroundColorToReplace,
        };
        const renderTask = pdfPage.render(renderContext);
        const dataUrlPromise = () => new Promise((resolve, reject) => {
            resolve(canvas.toDataURL());
        });
        return renderTask.promise.then(dataUrlPromise);
    }
    getPageDrawContext(width, height) {
        const canvas = document.createElement('canvas');
        const ctx = canvas.getContext('2d', { alpha: true });
        if (!ctx) {
            // tslint:disable-next-line: quotemark
            throw new Error("Couldn't create the 2d context");
        }
        canvas.width = width;
        canvas.height = height;
        canvas.style.width = width + 'px';
        canvas.style.height = height + 'px';
        return { ctx, canvas };
    }
    async getCurrentDocumentAsBlob() {
        const PDFViewerApplication = window.PDFViewerApplication;
        const data = await PDFViewerApplication.pdfDocument.saveDocument(PDFViewerApplication.pdfDocument.annotationStorage);
        return new Blob([data], { type: 'application/pdf' });
    }
    async getFormData(currentFormValues = true) {
        const PDFViewerApplication = window.PDFViewerApplication;
        const pdf /*: PDFDocumentProxy */ = PDFViewerApplication.pdfDocument;
        // screen DPI / PDF DPI
        const dpiRatio = 96 / 72;
        const result = [];
        for (let i = 1; i <= pdf.numPages; i++) {
            // track the current page
            const currentPage /* : PDFPageProxy */ = await pdf.getPage(i);
            const annotations = await currentPage.getAnnotations();
            annotations
                .filter((a) => a.subtype === 'Widget') // get the form field annotations only
                .map((a) => ({ ...a })) // only expose copies of the annotations to avoid side-effects
                .forEach((a) => {
                // get the rectangle that represent the single field
                // and resize it according to the current DPI
                const fieldRect = currentPage.getViewport({ scale: dpiRatio }).convertToViewportRectangle(a.rect);
                // add the corresponding input
                if (currentFormValues && a.fieldName) {
                    try {
                        if (a.exportValue) {
                            const currentValue = PDFViewerApplication.pdfDocument.annotationStorage.getValue(a.id, a.fieldName + '/' + a.exportValue, '');
                            a.value = currentValue?.value;
                        }
                        else if (a.radioButton) {
                            const currentValue = PDFViewerApplication.pdfDocument.annotationStorage.getValue(a.id, a.fieldName + '/' + a.fieldValue, '');
                            a.value = currentValue?.value;
                        }
                        else {
                            const currentValue = PDFViewerApplication.pdfDocument.annotationStorage.getValue(a.id, a.fieldName, '');
                            a.value = currentValue?.value;
                        }
                    }
                    catch (exception) {
                        // just ignore it
                    }
                }
                result.push({ fieldAnnotation: a, fieldRect, pageNumber: i });
            });
        }
        return result;
    }
    /**
     * Adds a page to the rendering queue
     * @param {number} pageIndex Index of the page to render
     * @returns {boolean} false, if the page has already been rendered
     * or if it's out of range
     */
    addPageToRenderQueue(pageIndex) {
        const PDFViewerApplication = window.PDFViewerApplication;
        return PDFViewerApplication.pdfViewer.addPageToRenderQueue(pageIndex);
    }
    isRenderQueueEmpty() {
        const scrolledDown = true;
        const renderExtra = false;
        const PDFViewerApplication = window.PDFViewerApplication;
        const nextPage = PDFViewerApplication.pdfViewer.renderingQueue.getHighestPriority(PDFViewerApplication.pdfViewer._getVisiblePages(), PDFViewerApplication.pdfViewer._pages, scrolledDown, renderExtra);
        return !nextPage;
    }
    hasPageBeenRendered(pageIndex) {
        const PDFViewerApplication = window.PDFViewerApplication;
        const pages = PDFViewerApplication.pdfViewer._pages;
        if (pages.length > pageIndex && pageIndex >= 0) {
            const pageView = pages[pageIndex];
            const isLoading = pageView.div.querySelector('.loadingIcon');
            return !isLoading;
        }
        return false;
    }
    currentlyRenderedPages() {
        const PDFViewerApplication = window.PDFViewerApplication;
        const pages = PDFViewerApplication.pdfViewer._pages;
        return pages.filter((page) => !page.div.querySelector('.loadingIcon')).map((page) => page.id);
    }
    numberOfPages() {
        const PDFViewerApplication = window.PDFViewerApplication;
        const pages = PDFViewerApplication.pdfViewer._pages;
        return pages.length;
    }
    getCurrentlyVisiblePageNumbers() {
        const app = window.PDFViewerApplication;
        const pages = app.pdfViewer._getVisiblePages().views;
        const pageNumbers = pages?.map((page) => page.id);
        return pageNumbers;
    }
    recalculateSize() {
        this.recalculateSize$.next();
    }
    async listLayers() {
        const PDFViewerApplication = window.PDFViewerApplication;
        const optionalContentConfig = await PDFViewerApplication.pdfViewer.optionalContentConfigPromise;
        if (optionalContentConfig) {
            const levelData = optionalContentConfig.getOrder();
            console.log(levelData);
            const layerIds = levelData.filter((groupId) => typeof groupId !== 'object');
            return layerIds.map((layerId) => {
                const config = optionalContentConfig.getGroup(layerId);
                return {
                    layerId: layerId,
                    name: config.name,
                    visible: config.visible,
                };
            });
        }
        return undefined;
    }
    async toggleLayer(layerId) {
        const PDFViewerApplication = window.PDFViewerApplication;
        const optionalContentConfig = await PDFViewerApplication.pdfViewer.optionalContentConfigPromise;
        if (optionalContentConfig) {
            let isVisible = optionalContentConfig.isVisible(layerId);
            const checkbox = document.querySelector(`input[id='${layerId}']`);
            if (checkbox) {
                isVisible = checkbox.checked;
                checkbox.checked = !isVisible;
            }
            optionalContentConfig.setVisibility(layerId, !isVisible);
            PDFViewerApplication.eventBus.dispatch('optionalcontentconfig', {
                source: this,
                promise: Promise.resolve(optionalContentConfig),
            });
        }
    }
    scrollPageIntoView(pageNumber, pageSpot) {
        const PDFViewerApplication = window.PDFViewerApplication;
        const viewer = PDFViewerApplication.pdfViewer;
        viewer.scrollPagePosIntoView(pageNumber, pageSpot);
    }
}
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{ Subject } from 'rxjs';\nimport { NgxExtendedPdfViewerComponent } from './ngx-extended-pdf-viewer.component';\nimport { PdfLayer } from './options/optional_content_config';\nimport { PDFPrintRange } from './options/pdf-print-range';\nimport { IPDFViewerApplication } from './options/pdf-viewer-application';\n\nexport interface FindOptions {\n  highlightAll?: boolean;\n  matchCase?: boolean;\n  wholeWords?: boolean;\n  ignoreAccents?: boolean;\n  findMultipleSearchTexts?: boolean;\n  fuzzySearch?: boolean;\n  currentPage?: boolean; // search only in the current page\n  pageRange?: string; // page range definition, e.g. \"2\", \"2,3,4\", \"5-6\" or \"2,5-6,7\"\n}\n\ninterface DrawContext {\n  ctx: CanvasRenderingContext2D;\n  canvas: HTMLCanvasElement;\n}\n\nexport interface PDFExportScaleFactor {\n  width?: number;\n  height?: number;\n  scale?: number;\n}\n\nexport class NgxExtendedPdfViewerService {\n  public recalculateSize$ = new Subject<void>();\n\n  public findMultiple(text: Array<string>, options: FindOptions = {}): boolean {\n    options = {\n      ...options,\n      findMultipleSearchTexts: true,\n    };\n    const searchString = text.join('\\n') + '\\n';\n    return this.find(searchString, options);\n  }\n\n  public find(text: string, options: FindOptions = {}): boolean {\n    if (!NgxExtendedPdfViewerComponent.ngxExtendedPdfViewerInitialized) {\n      // tslint:disable-next-line:quotemark\n      console.error(\"The PDF viewer hasn't finished initializing. Please call find() later.\");\n      return false;\n    } else {\n      const highlightAllCheckbox = document.getElementById('findHighlightAll') as HTMLInputElement;\n      if (highlightAllCheckbox) {\n        highlightAllCheckbox.checked = options.highlightAll || false;\n      }\n      const findPageRange = document.getElementById('findRange') as HTMLInputElement;\n      if (findPageRange) {\n        findPageRange.value = options.pageRange || '';\n      }\n      const findCurrentPageCheckbox = document.getElementById('findCurrentPage') as HTMLInputElement;\n      if (findCurrentPageCheckbox) {\n        findCurrentPageCheckbox.checked = options.currentPage || false;\n      }\n\n      const matchCaseCheckbox = document.getElementById('findMatchCase') as HTMLInputElement;\n      if (matchCaseCheckbox) {\n        matchCaseCheckbox.checked = options.matchCase || false;\n      }\n      const entireWordCheckbox = document.getElementById('findEntireWord') as HTMLInputElement;\n      if (entireWordCheckbox) {\n        entireWordCheckbox.checked = options.wholeWords || false;\n      }\n      const findIgnoreAccentsCheckbox = document.getElementById('findIgnoreAccents') as HTMLInputElement;\n      if (findIgnoreAccentsCheckbox) {\n        findIgnoreAccentsCheckbox.checked = options.ignoreAccents || false;\n      }\n      const multipleSearchTerms = options.findMultipleSearchTexts || text.includes('\\n') || false;\n      const findMultipleSearchTextsCheckbox = document.getElementById('findMultipleSearchTexts') as HTMLInputElement;\n      if (findMultipleSearchTextsCheckbox) {\n        findMultipleSearchTextsCheckbox.checked = multipleSearchTerms;\n      }\n      const individualWordsModeCheckbox = document.getElementById('individualWordsMode') as HTMLInputElement;\n      if (individualWordsModeCheckbox) {\n        individualWordsModeCheckbox.checked = false;\n      }\n      const fuzzySearchCheckbox = document.getElementById('findFuzzy') as HTMLInputElement;\n      if (fuzzySearchCheckbox) {\n        fuzzySearchCheckbox.checked = options.fuzzySearch || false;\n      }\n      const inputField = multipleSearchTerms ? document.getElementById('findInputMultiline') : document.getElementById('findInput');\n      if (inputField) {\n        if (inputField instanceof HTMLTextAreaElement) {\n          inputField.value = text;\n\n          // todo dirty hack!\n          inputField.classList.remove('hidden');\n          (document.getElementById('findInput') as HTMLInputElement).classList.add('hidden');\n          (document.getElementById('individualWordsModeLabel') as HTMLInputElement).classList.remove('hidden');\n          (document.getElementById('individualWordsMode') as HTMLInputElement).classList.remove('hidden');\n          // end of the dirty hack\n        } else if (inputField instanceof HTMLInputElement) {\n          inputField.value = text;\n          // todo dirty hack!\n          inputField.classList.remove('hidden');\n          (document.getElementById('findInputMultiline') as HTMLInputElement).classList.add('hidden');\n          (document.getElementById('individualWordsModeLabel') as HTMLInputElement).classList.add('hidden');\n          (document.getElementById('individualWordsMode') as HTMLInputElement).classList.add('hidden');\n          // end of the dirty hack\n        }\n        inputField.dispatchEvent(new Event('input'));\n        return true;\n      } else {\n        // tslint:disable-next-line:quotemark\n        console.error(\"Unexpected error: the input field used to search isn't part of the DOM.\");\n        return false;\n      }\n    }\n  }\n\n  public findNext(): boolean {\n    if (!NgxExtendedPdfViewerComponent.ngxExtendedPdfViewerInitialized) {\n      // tslint:disable-next-line:quotemark\n      console.error(\"The PDF viewer hasn't finished initializing. Please call findNext() later.\");\n      return false;\n    } else {\n      const button = document.getElementById('findNext');\n      if (button) {\n        button.click();\n        return true;\n      }\n      return false;\n    }\n  }\n\n  public findPrevious(): boolean {\n    if (!NgxExtendedPdfViewerComponent.ngxExtendedPdfViewerInitialized) {\n      // tslint:disable-next-line:quotemark\n      console.error(\"The PDF viewer hasn't finished initializing. Please call findPrevious() later.\");\n      return false;\n    } else {\n      const button = document.getElementById('findPrevious');\n      if (button) {\n        button.click();\n        return true;\n      }\n      return false;\n    }\n  }\n\n  public print(printRange?: PDFPrintRange) {\n    const PDFViewerApplication: IPDFViewerApplication = (window as any).PDFViewerApplication;\n    const alreadyThere = !!window['isInPDFPrintRange'] && !printRange;\n    if (!alreadyThere) {\n      if (!printRange) {\n        printRange = {} as PDFPrintRange;\n      }\n      this.setPrintRange(printRange);\n    }\n    (window as any).printPDF();\n    if (!alreadyThere) {\n      PDFViewerApplication.eventBus.on('afterprint', () => {\n        this.removePrintRange();\n      });\n    }\n  }\n\n  public removePrintRange() {\n    window['isInPDFPrintRange'] = undefined;\n    window['filteredPageCount'] = undefined;\n  }\n\n  public setPrintRange(printRange: PDFPrintRange) {\n    const PDFViewerApplication: IPDFViewerApplication = (window as any).PDFViewerApplication;\n    window['isInPDFPrintRange'] = (page: number) => this.isInPDFPrintRange(page, printRange as PDFPrintRange);\n    window['filteredPageCount'] = this.filteredPageCount(PDFViewerApplication.pagesCount, printRange);\n  }\n\n  public filteredPageCount(pageCount: number, range: PDFPrintRange): number {\n    let result = 0;\n    for (let page = 1; page <= pageCount; page++) {\n      if (this.isInPDFPrintRange(page, range)) {\n        result++;\n      }\n    }\n    return result;\n  }\n\n  public isInPDFPrintRange(pageIndex: number, printRange: PDFPrintRange) {\n    const page = pageIndex + 1;\n    if (printRange.from) {\n      if (page < printRange.from) {\n        return false;\n      }\n    }\n    if (printRange.to) {\n      if (page > printRange.to) {\n        return false;\n      }\n    }\n    if (printRange.excluded) {\n      let e = printRange.excluded as Array<number>;\n      if (e.some((p) => p === page)) {\n        return false;\n      }\n    }\n    if (printRange.included) {\n      if (!printRange.included.some((p) => p === page)) {\n        return false;\n      }\n    }\n    return true;\n  }\n\n  public getPageAsText(pageNumber: number): Promise<string> {\n    const PDFViewerApplication: IPDFViewerApplication = (window as any).PDFViewerApplication;\n    const pdfDocument = PDFViewerApplication.pdfDocument;\n\n    const pagePromise: Promise<any> = pdfDocument.getPage(pageNumber);\n\n    const extractTextSnippets = (pdfPage) =>\n      new Promise<any>((resolve, reject) => {\n        const textSnippets = pdfPage.getTextContent();\n        resolve(textSnippets);\n      });\n    const combineTextSnippets = (textSnippets) =>\n      new Promise<string>((resolve, reject) => {\n        const text = this.convertTextInfoToText(textSnippets);\n        resolve(text);\n      });\n    return pagePromise.then(extractTextSnippets).then(combineTextSnippets);\n  }\n\n  private convertTextInfoToText(textInfo: any): string {\n    if (!textInfo) {\n      return '';\n    }\n    return textInfo.items.map((info) => info.str).join('');\n  }\n\n  public getPageAsImage(pageNumber: number, scale: PDFExportScaleFactor, background?: string, backgroundColorToReplace: string = '#FFFFFF'): Promise<any> {\n    const PDFViewerApplication: IPDFViewerApplication = (window as any).PDFViewerApplication;\n    const pdfDocument = PDFViewerApplication.pdfDocument;\n    const pagePromise: Promise<any> = pdfDocument.getPage(pageNumber);\n    const imagePromise = (pdfPage) =>\n      new Promise<any>((resolve, reject) => {\n        resolve(this.draw(pdfPage, scale, background, backgroundColorToReplace));\n      });\n\n    return pagePromise.then(imagePromise);\n  }\n\n  private draw(pdfPage: any, scale: PDFExportScaleFactor, background?: string, backgroundColorToReplace: string = '#FFFFFF'): Promise<HTMLCanvasElement> {\n    let zoomFactor = 1;\n    if (scale.scale) {\n      zoomFactor = scale.scale;\n    } else if (scale.width) {\n      zoomFactor = scale.width / pdfPage.getViewport({ scale: 1 }).width;\n    } else if (scale.height) {\n      zoomFactor = scale.height / pdfPage.getViewport({ scale: 1 }).height;\n    }\n    const viewport = pdfPage.getViewport({\n      scale: zoomFactor,\n    });\n    const { ctx, canvas } = this.getPageDrawContext(viewport.width, viewport.height);\n    const drawViewport = viewport.clone();\n\n    const renderContext = {\n      canvasContext: ctx,\n      viewport: drawViewport,\n      background,\n      backgroundColorToReplace,\n    };\n    const renderTask = pdfPage.render(renderContext);\n\n    const dataUrlPromise = () =>\n      new Promise<string>((resolve, reject) => {\n        resolve(canvas.toDataURL());\n      });\n\n    return renderTask.promise.then(dataUrlPromise);\n  }\n\n  private getPageDrawContext(width: number, height: number): DrawContext {\n    const canvas = document.createElement('canvas') as HTMLCanvasElement;\n    const ctx = canvas.getContext('2d', { alpha: true });\n    if (!ctx) {\n      // tslint:disable-next-line: quotemark\n      throw new Error(\"Couldn't create the 2d context\");\n    }\n\n    canvas.width = width;\n    canvas.height = height;\n    canvas.style.width = width + 'px';\n    canvas.style.height = height + 'px';\n\n    return { ctx, canvas };\n  }\n\n  public async getCurrentDocumentAsBlob(): Promise<Blob> {\n    const PDFViewerApplication: IPDFViewerApplication = (window as any).PDFViewerApplication;\n    const data = await PDFViewerApplication.pdfDocument.saveDocument(PDFViewerApplication.pdfDocument.annotationStorage);\n    return new Blob([data], { type: 'application/pdf' });\n  }\n\n  public async getFormData(currentFormValues = true): Promise<Array<Object>> {\n    const PDFViewerApplication: IPDFViewerApplication = (window as any).PDFViewerApplication;\n    const pdf /*: PDFDocumentProxy */ = PDFViewerApplication.pdfDocument;\n    // screen DPI / PDF DPI\n    const dpiRatio = 96 / 72;\n    const result: Array<Object> = [];\n    for (let i = 1; i <= pdf.numPages; i++) {\n      // track the current page\n      const currentPage /* : PDFPageProxy */ = await pdf.getPage(i);\n      const annotations = await currentPage.getAnnotations();\n\n      annotations\n        .filter((a) => a.subtype === 'Widget') // get the form field annotations only\n        .map((a) => ({ ...a })) // only expose copies of the annotations to avoid side-effects\n        .forEach((a) => {\n          // get the rectangle that represent the single field\n          // and resize it according to the current DPI\n          const fieldRect: Array<number> = currentPage.getViewport({ scale: dpiRatio }).convertToViewportRectangle(a.rect);\n\n          // add the corresponding input\n          if (currentFormValues && a.fieldName) {\n            try {\n              if (a.exportValue) {\n                const currentValue = PDFViewerApplication.pdfDocument.annotationStorage.getValue(a.id, a.fieldName + '/' + a.exportValue, '');\n                a.value = currentValue?.value;\n              } else if (a.radioButton) {\n                const currentValue = PDFViewerApplication.pdfDocument.annotationStorage.getValue(a.id, a.fieldName + '/' + a.fieldValue, '');\n                a.value = currentValue?.value;\n              } else {\n                const currentValue = PDFViewerApplication.pdfDocument.annotationStorage.getValue(a.id, a.fieldName, '');\n                a.value = currentValue?.value;\n              }\n            } catch (exception) {\n              // just ignore it\n            }\n          }\n          result.push({ fieldAnnotation: a, fieldRect, pageNumber: i });\n        });\n    }\n    return result;\n  }\n\n  /**\n   * Adds a page to the rendering queue\n   * @param {number} pageIndex Index of the page to render\n   * @returns {boolean} false, if the page has already been rendered\n   * or if it's out of range\n   */\n  public addPageToRenderQueue(pageIndex: number): boolean {\n    const PDFViewerApplication: IPDFViewerApplication = (window as any).PDFViewerApplication;\n    return PDFViewerApplication.pdfViewer.addPageToRenderQueue(pageIndex);\n  }\n\n  public isRenderQueueEmpty(): boolean {\n    const scrolledDown = true;\n    const renderExtra = false;\n    const PDFViewerApplication: IPDFViewerApplication = (window as any).PDFViewerApplication;\n    const nextPage = PDFViewerApplication.pdfViewer.renderingQueue.getHighestPriority(\n      PDFViewerApplication.pdfViewer._getVisiblePages(),\n      PDFViewerApplication.pdfViewer._pages,\n      scrolledDown,\n      renderExtra\n    );\n    return !nextPage;\n  }\n\n  public hasPageBeenRendered(pageIndex: number): boolean {\n    const PDFViewerApplication: IPDFViewerApplication = (window as any).PDFViewerApplication;\n    const pages = PDFViewerApplication.pdfViewer._pages;\n    if (pages.length > pageIndex && pageIndex >= 0) {\n      const pageView = pages[pageIndex];\n      const isLoading = pageView.div.querySelector('.loadingIcon');\n      return !isLoading;\n    }\n    return false;\n  }\n\n  public currentlyRenderedPages(): Array<number> {\n    const PDFViewerApplication: IPDFViewerApplication = (window as any).PDFViewerApplication;\n    const pages = PDFViewerApplication.pdfViewer._pages;\n    return pages.filter((page) => !page.div.querySelector('.loadingIcon')).map((page) => page.id);\n  }\n\n  public numberOfPages(): number {\n    const PDFViewerApplication: IPDFViewerApplication = (window as any).PDFViewerApplication;\n    const pages = PDFViewerApplication.pdfViewer._pages;\n    return pages.length;\n  }\n\n  public getCurrentlyVisiblePageNumbers(): Array<number> {\n    const app = (window as any).PDFViewerApplication as IPDFViewerApplication;\n    const pages = (app.pdfViewer._getVisiblePages() as any).views as Array<any>;\n    const pageNumbers = pages?.map((page) => page.id);\n    return pageNumbers;\n  }\n\n  public recalculateSize(): void {\n    this.recalculateSize$.next();\n  }\n\n  public async listLayers(): Promise<Array<PdfLayer> | undefined> {\n    const PDFViewerApplication: IPDFViewerApplication = (window as any).PDFViewerApplication;\n\n    const optionalContentConfig = await PDFViewerApplication.pdfViewer.optionalContentConfigPromise;\n    if (optionalContentConfig) {\n      const levelData = optionalContentConfig.getOrder();\n      console.log(levelData);\n      const layerIds = levelData.filter((groupId) => typeof groupId !== 'object');\n      return layerIds.map((layerId) => {\n        const config = optionalContentConfig.getGroup(layerId);\n        return {\n          layerId: layerId,\n          name: config.name,\n          visible: config.visible,\n        } as PdfLayer;\n      });\n    }\n    return undefined;\n  }\n\n  public async toggleLayer(layerId: string): Promise<void> {\n    const PDFViewerApplication: IPDFViewerApplication = (window as any).PDFViewerApplication;\n    const optionalContentConfig = await PDFViewerApplication.pdfViewer.optionalContentConfigPromise;\n    if (optionalContentConfig) {\n      let isVisible = optionalContentConfig.isVisible(layerId);\n      const checkbox = document.querySelector(`input[id='${layerId}']`);\n      if (checkbox) {\n        isVisible = (checkbox as HTMLInputElement).checked;\n        (checkbox as HTMLInputElement).checked = !isVisible;\n      }\n      optionalContentConfig.setVisibility(layerId, !isVisible);\n      PDFViewerApplication.eventBus.dispatch('optionalcontentconfig', {\n        source: this,\n        promise: Promise.resolve(optionalContentConfig),\n      });\n    }\n  }\n\n  public scrollPageIntoView(pageNumber: number, pageSpot?: { top?: number | string; left?: number | string }): void {\n    const PDFViewerApplication: IPDFViewerApplication = (window as any).PDFViewerApplication;\n    const viewer = PDFViewerApplication.pdfViewer as any;\n    viewer.scrollPagePosIntoView(pageNumber, pageSpot);\n  }\n}\n"]}