CocoRoboDesktop/pdf.js/examples/components/pageviewer.js

/* Copyright 2014 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

"use strict";

if (!pdfjsLib.getDocument || !pdfjsViewer.PDFPageView) {
  // eslint-disable-next-line no-alert
  alert("Please build the pdfjs-dist library using\n  `gulp dist-install`");
}

// The workerSrc property shall be specified.
//
pdfjsLib.GlobalWorkerOptions.workerSrc =
  "../../node_modules/pdfjs-dist/build/pdf.worker.js";

// Some PDFs need external cmaps.
//
const CMAP_URL = "../../node_modules/pdfjs-dist/cmaps/";
const CMAP_PACKED = true;

const DEFAULT_URL = "../../web/compressed.tracemonkey-pldi-09.pdf";
const PAGE_TO_VIEW = 1;
const SCALE = 1.0;

const ENABLE_XFA = true;

const container = document.getElementById("pageContainer");

const eventBus = new pdfjsViewer.EventBus();

// Loading document.
const loadingTask = pdfjsLib.getDocument({
  url: DEFAULT_URL,
  cMapUrl: CMAP_URL,
  cMapPacked: CMAP_PACKED,
  enableXfa: ENABLE_XFA,
});
(async function () {
  const pdfDocument = await loadingTask.promise;
  // Document loaded, retrieving the page.
  const pdfPage = await pdfDocument.getPage(PAGE_TO_VIEW);

  const match = /^(\d+)\.(\d+)\.(\d+)$/.exec(pdfjsLib.version);
  if (match && (match[1] | 0) >= 3 && (match[2] | 0) >= 2) {
    // Creating the page view with default parameters.
    const pdfPageView = new pdfjsViewer.PDFPageView({
      container,
      id: PAGE_TO_VIEW,
      scale: SCALE,
      defaultViewport: pdfPage.getViewport({ scale: SCALE }),
      eventBus,
    });
    // Associate the actual page with the view, and draw it.
    pdfPageView.setPdfPage(pdfPage);
    return pdfPageView.draw();
  }
  // Creating the page view with default parameters.
  const pdfPageView = new pdfjsViewer.PDFPageView({
    container,
    id: PAGE_TO_VIEW,
    scale: SCALE,
    defaultViewport: pdfPage.getViewport({ scale: SCALE }),
    eventBus,
    // We can enable text/annotation/xfa/struct-layers, as needed.
    textLayerFactory: !pdfDocument.isPureXfa
      ? new pdfjsViewer.DefaultTextLayerFactory()
      : null,
    annotationLayerFactory: new pdfjsViewer.DefaultAnnotationLayerFactory(),
    xfaLayerFactory: pdfDocument.isPureXfa
      ? new pdfjsViewer.DefaultXfaLayerFactory()
      : null,
    structTreeLayerFactory: new pdfjsViewer.DefaultStructTreeLayerFactory(),
  });
  // Associate the actual page with the view, and draw it.
  pdfPageView.setPdfPage(pdfPage);
  return pdfPageView.draw();
})();