pdfjs-dist/lib/web/firefox_print_service.js

/* Copyright 2017 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';
var uiUtils = require('./ui_utils.js');
var app = require('./app.js');
var pdfjsLib = require('./pdfjs.js');
var CSS_UNITS = uiUtils.CSS_UNITS;
var PDFPrintServiceFactory = app.PDFPrintServiceFactory;
function composePage(pdfDocument, pageNumber, size, printContainer) {
 var canvas = document.createElement('canvas');
 var PRINT_RESOLUTION = 150;
 var PRINT_UNITS = PRINT_RESOLUTION / 72.0;
 canvas.width = Math.floor(size.width * PRINT_UNITS);
 canvas.height = Math.floor(size.height * PRINT_UNITS);
 canvas.style.width = Math.floor(size.width * CSS_UNITS) + 'px';
 canvas.style.height = Math.floor(size.height * CSS_UNITS) + 'px';
 var canvasWrapper = document.createElement('div');
 canvasWrapper.appendChild(canvas);
 printContainer.appendChild(canvasWrapper);
 canvas.mozPrintCallback = function (obj) {
  var ctx = obj.context;
  ctx.save();
  ctx.fillStyle = 'rgb(255, 255, 255)';
  ctx.fillRect(0, 0, canvas.width, canvas.height);
  ctx.restore();
  pdfDocument.getPage(pageNumber).then(function (pdfPage) {
   var renderContext = {
    canvasContext: ctx,
    transform: [
     PRINT_UNITS,
     0,
     0,
     PRINT_UNITS,
     0,
     0
    ],
    viewport: pdfPage.getViewport(1, size.rotation),
    intent: 'print'
   };
   return pdfPage.render(renderContext).promise;
  }).then(function () {
   obj.done();
  }, function (error) {
   console.error(error);
   if ('abort' in obj) {
    obj.abort();
   } else {
    obj.done();
   }
  });
 };
}
function FirefoxPrintService(pdfDocument, pagesOverview, printContainer) {
 this.pdfDocument = pdfDocument;
 this.pagesOverview = pagesOverview;
 this.printContainer = printContainer;
}
FirefoxPrintService.prototype = {
 layout: function () {
  var pdfDocument = this.pdfDocument;
  var printContainer = this.printContainer;
  var body = document.querySelector('body');
  body.setAttribute('data-pdfjsprinting', true);
  for (var i = 0, ii = this.pagesOverview.length; i < ii; ++i) {
   composePage(pdfDocument, i + 1, this.pagesOverview[i], printContainer);
  }
 },
 destroy: function () {
  this.printContainer.textContent = '';
 }
};
PDFPrintServiceFactory.instance = {
 get supportsPrinting() {
  var canvas = document.createElement('canvas');
  var value = 'mozPrintCallback' in canvas;
  return pdfjsLib.shadow(this, 'supportsPrinting', value);
 },
 createPrintService: function (pdfDocument, pagesOverview, printContainer) {
  return new FirefoxPrintService(pdfDocument, pagesOverview, printContainer);
 }
};
exports.FirefoxPrintService = FirefoxPrintService;