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;