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.
404 lines • 59.1 kB
JavaScript
import { Subject } from 'rxjs';
export class NgxExtendedPdfViewerService {
ngxExtendedPdfViewerInitialized = false;
recalculateSize$ = new Subject();
secondaryMenuIsEmpty = false;
find(text, options = {}) {
if (!this.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 matchDiacriticsCheckbox = document.getElementById('findMatchDiacritics');
if (matchDiacriticsCheckbox) {
matchDiacriticsCheckbox.checked = options.matchDiacritics ?? false;
}
const inputField = document.getElementById('findInput');
if (inputField) {
inputField.value = text;
// todo dirty hack!
inputField.classList.remove('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 (!this.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 (!this.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) {
if (printRange.excluded.some((p) => p === page)) {
return false;
}
}
if (printRange.included) {
if (!printRange.included.some((p) => p === page)) {
return false;
}
}
return true;
}
async getPageAsLines(pageNumber) {
const PDFViewerApplication = window.PDFViewerApplication;
const pdfDocument = PDFViewerApplication.pdfDocument;
const page = await pdfDocument.getPage(pageNumber);
const textSnippets = (await page.getTextContent()).items //
.filter((info) => !info['type']); // ignore the TextMarkedContent items
const snippets = textSnippets;
let minX = Number.MAX_SAFE_INTEGER;
let minY = Number.MAX_SAFE_INTEGER;
let maxX = Number.MIN_SAFE_INTEGER;
let maxY = Number.MIN_SAFE_INTEGER;
let countLTR = 0;
let countRTL = 0;
let text = '';
let lines = new Array();
for (let i = 0; i < snippets.length; i++) {
const currentSnippet = snippets[i];
if (!currentSnippet.hasEOL) {
const x = currentSnippet.transform[4];
const y = -currentSnippet.transform[5];
const width = currentSnippet.width;
const height = currentSnippet.height;
minX = Math.min(minX, x);
minY = Math.min(minY, y);
maxX = Math.max(maxX, x + width);
maxY = Math.max(maxY, y + height);
text += currentSnippet.str;
if (currentSnippet.dir === 'rtl') {
countRTL++;
}
if (currentSnippet.dir === 'ltr') {
countLTR++;
}
}
let addIt = i === snippets.length - 1 || currentSnippet.hasEOL;
if (addIt) {
let direction = undefined;
if (countLTR > 0 && countRTL > 0) {
direction = 'both';
}
else if (countLTR > 0) {
direction = 'ltr';
}
else if (countRTL > 0) {
direction = 'rtl';
}
const line = {
direction,
x: minX,
y: minY,
width: maxX - minX,
height: maxY - minY,
text: text.trim(),
};
lines.push(line);
minX = Number.MAX_SAFE_INTEGER;
minY = Number.MAX_SAFE_INTEGER;
maxX = Number.MIN_SAFE_INTEGER;
maxY = Number.MIN_SAFE_INTEGER;
countLTR = 0;
countRTL = 0;
text = '';
}
}
return lines;
}
async getPageAsText(pageNumber) {
const PDFViewerApplication = window.PDFViewerApplication;
const pdfDocument = PDFViewerApplication.pdfDocument;
const page = await pdfDocument.getPage(pageNumber);
const textSnippets = (await page.getTextContent()).items;
return this.convertTextInfoToText(textSnippets);
}
convertTextInfoToText(textInfoItems) {
if (!textInfoItems) {
return '';
}
return textInfoItems
.filter((info) => !info['type'])
.map((info) => (info.hasEOL ? info.str + '\n' : 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) => Promise.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 = () => Promise.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;
return await PDFViewerApplication.export();
}
async getFormData(currentFormValues = true) {
const PDFViewerApplication = window.PDFViewerApplication;
const pdf = 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.renderingState === 3;
return !isLoading;
}
return false;
}
currentlyRenderedPages() {
const PDFViewerApplication = window.PDFViewerApplication;
const pages = PDFViewerApplication.pdfViewer._pages;
return pages.filter((page) => page.renderingState === 3).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;
return pages?.map((page) => page.id);
}
recalculateSize() {
this.recalculateSize$.next();
}
async listLayers() {
const PDFViewerApplication = window.PDFViewerApplication;
const optionalContentConfig = await PDFViewerApplication.pdfViewer.optionalContentConfigPromise;
if (optionalContentConfig) {
const levelData = optionalContentConfig.getOrder();
const layerIds = levelData.filter((groupId) => typeof groupId !== 'object');
return layerIds.map((layerId) => {
const config = optionalContentConfig.getGroup(layerId);
return {
layerId: layerId,
name: config.name,
visible: config.visible,
};
});
}
return undefined;
}
async toggleLayer(layerId) {
const PDFViewerApplication = window.PDFViewerApplication;
const optionalContentConfig = await PDFViewerApplication.pdfViewer.optionalContentConfigPromise;
if (optionalContentConfig) {
let isVisible = optionalContentConfig.getGroup(layerId).visible;
const checkbox = document.querySelector(`input[id='${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);
}
getSerializedAnnotations() {
const PDFViewerApplication = window.PDFViewerApplication;
return PDFViewerApplication.pdfViewer.getSerializedAnnotations();
}
addEditorAnnotation(serializedAnnotation) {
const PDFViewerApplication = window.PDFViewerApplication;
PDFViewerApplication.pdfViewer.addEditorAnnotation(serializedAnnotation);
}
removeEditorAnnotations(filter) {
const PDFViewerApplication = window.PDFViewerApplication;
PDFViewerApplication.pdfViewer.removeEditorAnnotations(filter);
}
}
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{ Subject } from 'rxjs';\nimport { PdfLayer } from './options/optional_content_config';\nimport { PDFPrintRange } from './options/pdf-print-range';\nimport { IPDFViewerApplication, PDFDocumentProxy, TextItem, TextMarkedContent } from './options/pdf-viewer-application';\nimport { EditorAnnotation } from './options/pdf-viewer';\n\nexport interface FindOptions {\n  highlightAll?: boolean;\n  matchCase?: boolean;\n  wholeWords?: boolean;\n  matchDiacritics?: 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\ntype DirectionType = 'ltr' | 'rtl' | 'both' | undefined;\n\nexport interface Line {\n  x: number;\n  y: number;\n  width: number;\n  height: number;\n  direction: DirectionType;\n  text: string;\n}\nexport interface Section {\n  x: number;\n  y: number;\n  width: number;\n  height: number;\n  direction: DirectionType;\n  lines: Array<Line>;\n}\n\nexport class NgxExtendedPdfViewerService {\n\n  public ngxExtendedPdfViewerInitialized = false;\n\n  public recalculateSize$ = new Subject<void>();\n\n  public secondaryMenuIsEmpty = false;\n\n  public find(text: string, options: FindOptions = {}): boolean {\n    if (!this.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\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 matchDiacriticsCheckbox = document.getElementById('findMatchDiacritics') as HTMLInputElement;\n      if (matchDiacriticsCheckbox) {\n        matchDiacriticsCheckbox.checked = options.matchDiacritics ?? false;\n      }\n      const inputField = document.getElementById('findInput') as HTMLInputElement;\n      if (inputField) {\n        inputField.value = text;\n        // todo dirty hack!\n        inputField.classList.remove('hidden');\n        // end of the dirty hack\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 (!this.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 (!this.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);\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      if (printRange.excluded.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 async getPageAsLines(pageNumber: number): Promise<Array<Line>> {\n    const PDFViewerApplication: IPDFViewerApplication = (window as any).PDFViewerApplication;\n    const pdfDocument = PDFViewerApplication.pdfDocument;\n\n    const page = await pdfDocument.getPage(pageNumber);\n    const textSnippets = (await page.getTextContent()).items //\n      .filter((info) => !info['type']); // ignore the TextMarkedContent items\n\n    const snippets = textSnippets as Array<TextItem>;\n\n    let minX = Number.MAX_SAFE_INTEGER;\n    let minY = Number.MAX_SAFE_INTEGER;\n    let maxX = Number.MIN_SAFE_INTEGER;\n    let maxY = Number.MIN_SAFE_INTEGER;\n    let countLTR = 0;\n    let countRTL = 0;\n    let text = '';\n    let lines = new Array<Line>();\n    for (let i = 0; i < snippets.length; i++) {\n      const currentSnippet = snippets[i];\n      if (!currentSnippet.hasEOL) {\n        const x = currentSnippet.transform[4];\n        const y = -currentSnippet.transform[5];\n        const width = currentSnippet.width;\n        const height = currentSnippet.height;\n        minX = Math.min(minX, x);\n        minY = Math.min(minY, y);\n        maxX = Math.max(maxX, x + width);\n        maxY = Math.max(maxY, y + height);\n        text += currentSnippet.str;\n        if (currentSnippet.dir === 'rtl') {\n          countRTL++;\n        }\n        if (currentSnippet.dir === 'ltr') {\n          countLTR++;\n        }\n      }\n\n      let addIt = i === snippets.length - 1 || currentSnippet.hasEOL;\n      if (addIt) {\n        let direction: DirectionType = undefined;\n        if (countLTR > 0 && countRTL > 0) {\n          direction = 'both';\n        } else if (countLTR > 0) {\n          direction = 'ltr';\n        } else if (countRTL > 0) {\n          direction = 'rtl';\n        }\n        const line = {\n          direction,\n          x: minX,\n          y: minY,\n          width: maxX - minX,\n          height: maxY - minY,\n          text: text.trim(),\n        } as Line;\n        lines.push(line);\n        minX = Number.MAX_SAFE_INTEGER;\n        minY = Number.MAX_SAFE_INTEGER;\n        maxX = Number.MIN_SAFE_INTEGER;\n        maxY = Number.MIN_SAFE_INTEGER;\n        countLTR = 0;\n        countRTL = 0;\n        text = '';\n      }\n    }\n    return lines;\n  }\n\n  public async getPageAsText(pageNumber: number): Promise<string> {\n    const PDFViewerApplication: IPDFViewerApplication = (window as any).PDFViewerApplication;\n    const pdfDocument = PDFViewerApplication.pdfDocument;\n\n    const page = await pdfDocument.getPage(pageNumber);\n    const textSnippets = (await page.getTextContent()).items;\n    return this.convertTextInfoToText(textSnippets);\n  }\n\n  private convertTextInfoToText(textInfoItems: Array<TextItem | TextMarkedContent>): string {\n    if (!textInfoItems) {\n      return '';\n    }\n    return textInfoItems\n      .filter((info) => !info['type'])\n      .map((info: TextItem) => (info.hasEOL ? info.str + '\\n' : info.str))\n      .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) => Promise.resolve(this.draw(pdfPage, scale, background, backgroundColorToReplace));\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 = () => Promise.resolve(canvas.toDataURL());\n\n    return renderTask.promise.then(dataUrlPromise);\n  }\n\n  private getPageDrawContext(width: number, height: number): DrawContext {\n    const canvas = document.createElement('canvas');\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    return await PDFViewerApplication.export();\n  }\n\n  public async getFormData(currentFormValues = true): Promise<Array<Object>> {\n    const PDFViewerApplication: IPDFViewerApplication = (window as any).PDFViewerApplication;\n    const pdf: PDFDocumentProxy | undefined = 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: any = PDFViewerApplication.pdfDocument.annotationStorage.getValue(a.id, a.fieldName + '/' + a.exportValue, '');\n                a.value = currentValue?.value;\n              } else if (a.radioButton) {\n                const currentValue: any = PDFViewerApplication.pdfDocument.annotationStorage.getValue(a.id, a.fieldName + '/' + a.fieldValue, '');\n                a.value = currentValue?.value;\n              } else {\n                const currentValue: any = 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.renderingState === 3;\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.renderingState === 3).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    return pages?.map((page) => page.id);\n  }\n\n  public recalculateSize(): void {\n    this.recalculateSize$.next();\n  }\n\n  public async listLayers(): Promise<Array<PdfLayer> | undefined> {\n    const PDFViewerApplication: IPDFViewerApplication = (window as any).PDFViewerApplication;\n\n    const optionalContentConfig = await PDFViewerApplication.pdfViewer.optionalContentConfigPromise;\n    if (optionalContentConfig) {\n      const levelData = optionalContentConfig.getOrder();\n      const layerIds = levelData.filter((groupId) => typeof groupId !== 'object');\n      return layerIds.map((layerId) => {\n        const config = optionalContentConfig.getGroup(layerId);\n        return {\n          layerId: layerId,\n          name: config.name,\n          visible: config.visible,\n        } as PdfLayer;\n      });\n    }\n    return undefined;\n  }\n\n  public async toggleLayer(layerId: string): Promise<void> {\n    const PDFViewerApplication: IPDFViewerApplication = (window as any).PDFViewerApplication;\n    const optionalContentConfig = await PDFViewerApplication.pdfViewer.optionalContentConfigPromise;\n    if (optionalContentConfig) {\n      let isVisible = optionalContentConfig.getGroup(layerId).visible;\n      const checkbox = document.querySelector(`input[id='${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  public getSerializedAnnotations(): EditorAnnotation[] | null {\n    const PDFViewerApplication: IPDFViewerApplication = (window as any).PDFViewerApplication;\n    return PDFViewerApplication.pdfViewer.getSerializedAnnotations();\n  }\n\n  public addEditorAnnotation(serializedAnnotation: string | EditorAnnotation): void {\n    const PDFViewerApplication: IPDFViewerApplication = (window as any).PDFViewerApplication;\n    PDFViewerApplication.pdfViewer.addEditorAnnotation(serializedAnnotation);\n  }\n\n  public removeEditorAnnotations(filter?: (serialized: object) => boolean): void {\n    const PDFViewerApplication: IPDFViewerApplication = (window as any).PDFViewerApplication;\n    PDFViewerApplication.pdfViewer.removeEditorAnnotations(filter);\n  }\n}\n"]}