pdfjs-dist/lib/web/pdf_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';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.PDFPrintService = undefined;

var _ui_utils = require('./ui_utils');

var _overlay_manager = require('./overlay_manager');

var _pdfjs = require('./pdfjs');

var _app = require('./app');

var activeService = null;
function renderPage(activeServiceOnEntry, pdfDocument, pageNumber, size) {
  var scratchCanvas = activeService.scratchCanvas;
  var PRINT_RESOLUTION = 150;
  var PRINT_UNITS = PRINT_RESOLUTION / 72.0;
  scratchCanvas.width = Math.floor(size.width * PRINT_UNITS);
  scratchCanvas.height = Math.floor(size.height * PRINT_UNITS);
  var width = Math.floor(size.width * _ui_utils.CSS_UNITS) + 'px';
  var height = Math.floor(size.height * _ui_utils.CSS_UNITS) + 'px';
  var ctx = scratchCanvas.getContext('2d');
  ctx.save();
  ctx.fillStyle = 'rgb(255, 255, 255)';
  ctx.fillRect(0, 0, scratchCanvas.width, scratchCanvas.height);
  ctx.restore();
  return 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 () {
    return {
      width: width,
      height: height
    };
  });
}
function PDFPrintService(pdfDocument, pagesOverview, printContainer) {
  this.pdfDocument = pdfDocument;
  this.pagesOverview = pagesOverview;
  this.printContainer = printContainer;
  this.currentPage = -1;
  this.scratchCanvas = document.createElement('canvas');
}
PDFPrintService.prototype = {
  layout: function () {
    this.throwIfInactive();
    var body = document.querySelector('body');
    body.setAttribute('data-pdfjsprinting', true);
    var hasEqualPageSizes = this.pagesOverview.every(function (size) {
      return size.width === this.pagesOverview[0].width && size.height === this.pagesOverview[0].height;
    }, this);
    if (!hasEqualPageSizes) {
      console.warn('Not all pages have the same size. The printed ' + 'result may be incorrect!');
    }
    this.pageStyleSheet = document.createElement('style');
    var pageSize = this.pagesOverview[0];
    this.pageStyleSheet.textContent = '@supports ((size:A4) and (size:1pt 1pt)) {' + '@page { size: ' + pageSize.width + 'pt ' + pageSize.height + 'pt;}' + '}';
    body.appendChild(this.pageStyleSheet);
  },
  destroy: function () {
    if (activeService !== this) {
      return;
    }
    this.printContainer.textContent = '';
    if (this.pageStyleSheet && this.pageStyleSheet.parentNode) {
      this.pageStyleSheet.parentNode.removeChild(this.pageStyleSheet);
      this.pageStyleSheet = null;
    }
    this.scratchCanvas.width = this.scratchCanvas.height = 0;
    this.scratchCanvas = null;
    activeService = null;
    ensureOverlay().then(function () {
      if (_overlay_manager.OverlayManager.active !== 'printServiceOverlay') {
        return;
      }
      _overlay_manager.OverlayManager.close('printServiceOverlay');
    });
  },
  renderPages: function () {
    var pageCount = this.pagesOverview.length;
    var renderNextPage = function (resolve, reject) {
      this.throwIfInactive();
      if (++this.currentPage >= pageCount) {
        renderProgress(pageCount, pageCount);
        resolve();
        return;
      }
      var index = this.currentPage;
      renderProgress(index, pageCount);
      renderPage(this, this.pdfDocument, index + 1, this.pagesOverview[index]).then(this.useRenderedPage.bind(this)).then(function () {
        renderNextPage(resolve, reject);
      }, reject);
    }.bind(this);
    return new Promise(renderNextPage);
  },
  useRenderedPage: function (printItem) {
    this.throwIfInactive();
    var img = document.createElement('img');
    img.style.width = printItem.width;
    img.style.height = printItem.height;
    var scratchCanvas = this.scratchCanvas;
    if ('toBlob' in scratchCanvas && !_pdfjs.PDFJS.disableCreateObjectURL) {
      scratchCanvas.toBlob(function (blob) {
        img.src = URL.createObjectURL(blob);
      });
    } else {
      img.src = scratchCanvas.toDataURL();
    }
    var wrapper = document.createElement('div');
    wrapper.appendChild(img);
    this.printContainer.appendChild(wrapper);
    return new Promise(function (resolve, reject) {
      img.onload = resolve;
      img.onerror = reject;
    });
  },
  performPrint: function () {
    this.throwIfInactive();
    return new Promise(function (resolve) {
      setTimeout(function () {
        if (!this.active) {
          resolve();
          return;
        }
        print.call(window);
        setTimeout(resolve, 20);
      }.bind(this), 0);
    }.bind(this));
  },
  get active() {
    return this === activeService;
  },
  throwIfInactive: function () {
    if (!this.active) {
      throw new Error('This print request was cancelled or completed.');
    }
  }
};
var print = window.print;
window.print = function print() {
  if (activeService) {
    console.warn('Ignored window.print() because of a pending print job.');
    return;
  }
  ensureOverlay().then(function () {
    if (activeService) {
      _overlay_manager.OverlayManager.open('printServiceOverlay');
    }
  });
  try {
    dispatchEvent('beforeprint');
  } finally {
    if (!activeService) {
      console.error('Expected print service to be initialized.');
      if (_overlay_manager.OverlayManager.active === 'printServiceOverlay') {
        _overlay_manager.OverlayManager.close('printServiceOverlay');
      }
      return;
    }
    var activeServiceOnEntry = activeService;
    activeService.renderPages().then(function () {
      return activeServiceOnEntry.performPrint();
    }).catch(function () {}).then(function () {
      if (activeServiceOnEntry.active) {
        abort();
      }
    });
  }
};
function dispatchEvent(eventType) {
  var event = document.createEvent('CustomEvent');
  event.initCustomEvent(eventType, false, false, 'custom');
  window.dispatchEvent(event);
}
function abort() {
  if (activeService) {
    activeService.destroy();
    dispatchEvent('afterprint');
  }
}
function renderProgress(index, total) {
  var progressContainer = document.getElementById('printServiceOverlay');
  var progress = Math.round(100 * index / total);
  var progressBar = progressContainer.querySelector('progress');
  var progressPerc = progressContainer.querySelector('.relative-progress');
  progressBar.value = progress;
  progressPerc.textContent = _ui_utils.mozL10n.get('print_progress_percent', { progress: progress }, progress + '%');
}
var hasAttachEvent = !!document.attachEvent;
window.addEventListener('keydown', function (event) {
  if (event.keyCode === 80 && (event.ctrlKey || event.metaKey) && !event.altKey && (!event.shiftKey || window.chrome || window.opera)) {
    window.print();
    if (hasAttachEvent) {
      return;
    }
    event.preventDefault();
    if (event.stopImmediatePropagation) {
      event.stopImmediatePropagation();
    } else {
      event.stopPropagation();
    }
    return;
  }
}, true);
if (hasAttachEvent) {
  document.attachEvent('onkeydown', function (event) {
    event = event || window.event;
    if (event.keyCode === 80 && event.ctrlKey) {
      event.keyCode = 0;
      return false;
    }
  });
}
if ('onbeforeprint' in window) {
  var stopPropagationIfNeeded = function (event) {
    if (event.detail !== 'custom' && event.stopImmediatePropagation) {
      event.stopImmediatePropagation();
    }
  };
  window.addEventListener('beforeprint', stopPropagationIfNeeded);
  window.addEventListener('afterprint', stopPropagationIfNeeded);
}
var overlayPromise;
function ensureOverlay() {
  if (!overlayPromise) {
    overlayPromise = _overlay_manager.OverlayManager.register('printServiceOverlay', document.getElementById('printServiceOverlay'), abort, true);
    document.getElementById('printCancel').onclick = abort;
  }
  return overlayPromise;
}
_app.PDFPrintServiceFactory.instance = {
  supportsPrinting: true,
  createPrintService: function (pdfDocument, pagesOverview, printContainer) {
    if (activeService) {
      throw new Error('The print service is created and active.');
    }
    activeService = new PDFPrintService(pdfDocument, pagesOverview, printContainer);
    return activeService;
  }
};
exports.PDFPrintService = PDFPrintService;