ngx-extended-pdf-viewer
Version:
Embedding PDF files in your Angular application. Highly configurable viewer including the toolbar, sidebar, and all the features you're used to.
309 lines • 46.2 kB
JavaScript
import { __awaiter } from "tslib";
import { NgxExtendedPdfViewerComponent } from './ngx-extended-pdf-viewer.component';
export class NgxExtendedPdfViewerService {
constructor() { }
findMultiple(text, options = {}) {
options = Object.assign(Object.assign({}, 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 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) {
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));
});
return pagePromise.then(imagePromise);
}
draw(pdfPage, scale) {
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: 'rgba(255, 0, 255, 0.3)',
};
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: false });
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 };
}
getCurrentDocumentAsBlob() {
return __awaiter(this, void 0, void 0, function* () {
const PDFViewerApplication = window.PDFViewerApplication;
const data = yield PDFViewerApplication.pdfDocument.saveDocument(PDFViewerApplication.pdfDocument.annotationStorage);
return new Blob([data], { type: 'application/pdf' });
});
}
getFormData() {
return __awaiter(this, void 0, void 0, function* () {
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 */ = yield pdf.getPage(i);
const annotations = yield currentPage.getAnnotations();
annotations
.filter((a) => a.subtype === 'Widget') // get the form field annotations only
.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
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 === null || pages === void 0 ? void 0 : pages.map((page) => page.id);
return pageNumbers;
}
}
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{ filter } from 'rxjs';\nimport { NgxExtendedPdfViewerComponent } from './ngx-extended-pdf-viewer.component';\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}\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  constructor() {}\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 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): 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));\n      });\n\n    return pagePromise.then(imagePromise);\n  }\n\n  private draw(pdfPage: any, scale: PDFExportScaleFactor): 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: 'rgba(255, 0, 255, 0.3)',\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: false });\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(): 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        .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          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"]}