text: /* Copyright 2012 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.
   */
  /* globals PDFBug, Stats */
  
  'use strict';
  
  (function (root, factory) {
    if (typeof define === 'function' && define.amd) {
      define('pdfjs-web/app', ['exports', 'pdfjs-web/ui_utils',
        'pdfjs-web/download_manager', 'pdfjs-web/pdf_history',
        'pdfjs-web/preferences', 'pdfjs-web/pdf_sidebar',
        'pdfjs-web/view_history', 'pdfjs-web/pdf_thumbnail_viewer',
        'pdfjs-web/toolbar', 'pdfjs-web/secondary_toolbar',
        'pdfjs-web/password_prompt', 'pdfjs-web/pdf_presentation_mode',
        'pdfjs-web/pdf_document_properties', 'pdfjs-web/hand_tool',
        'pdfjs-web/pdf_viewer', 'pdfjs-web/pdf_rendering_queue',
        'pdfjs-web/pdf_link_service', 'pdfjs-web/pdf_outline_viewer',
        'pdfjs-web/overlay_manager', 'pdfjs-web/pdf_attachment_viewer',
        'pdfjs-web/pdf_find_controller', 'pdfjs-web/pdf_find_bar',
        'pdfjs-web/dom_events', 'pdfjs-web/pdfjs'],
        factory);
    } else if (typeof exports !== 'undefined') {
      factory(exports, require('./ui_utils.js'), require('./download_manager.js'),
        require('./pdf_history.js'), require('./preferences.js'),
        require('./pdf_sidebar.js'), require('./view_history.js'),
        require('./pdf_thumbnail_viewer.js'), require('./toolbar.js'),
        require('./secondary_toolbar.js'), require('./password_prompt.js'),
        require('./pdf_presentation_mode.js'),
        require('./pdf_document_properties.js'), require('./hand_tool.js'),
        require('./pdf_viewer.js'), require('./pdf_rendering_queue.js'),
        require('./pdf_link_service.js'), require('./pdf_outline_viewer.js'),
        require('./overlay_manager.js'), require('./pdf_attachment_viewer.js'),
        require('./pdf_find_controller.js'), require('./pdf_find_bar.js'),
        require('./dom_events.js'), require('./pdfjs.js'));
    } else {
      factory((root.pdfjsWebApp = {}), root.pdfjsWebUIUtils,
        root.pdfjsWebDownloadManager, root.pdfjsWebPDFHistory,
        root.pdfjsWebPreferences, root.pdfjsWebPDFSidebar,
        root.pdfjsWebViewHistory, root.pdfjsWebPDFThumbnailViewer,
        root.pdfjsWebToolbar, root.pdfjsWebSecondaryToolbar,
        root.pdfjsWebPasswordPrompt, root.pdfjsWebPDFPresentationMode,
        root.pdfjsWebPDFDocumentProperties, root.pdfjsWebHandTool,
        root.pdfjsWebPDFViewer, root.pdfjsWebPDFRenderingQueue,
        root.pdfjsWebPDFLinkService, root.pdfjsWebPDFOutlineViewer,
        root.pdfjsWebOverlayManager, root.pdfjsWebPDFAttachmentViewer,
        root.pdfjsWebPDFFindController, root.pdfjsWebPDFFindBar,
        root.pdfjsWebDOMEvents, root.pdfjsWebPDFJS);
    }
  }(this, function (exports, uiUtilsLib, downloadManagerLib, pdfHistoryLib,
                    preferencesLib, pdfSidebarLib, viewHistoryLib,
                    pdfThumbnailViewerLib, toolbarLib, secondaryToolbarLib,
                    passwordPromptLib, pdfPresentationModeLib,
                    pdfDocumentPropertiesLib, handToolLib, pdfViewerLib,
                    pdfRenderingQueueLib, pdfLinkServiceLib, pdfOutlineViewerLib,
                    overlayManagerLib, pdfAttachmentViewerLib,
                    pdfFindControllerLib, pdfFindBarLib, domEventsLib, pdfjsLib) {
  
  var UNKNOWN_SCALE = uiUtilsLib.UNKNOWN_SCALE;
  var DEFAULT_SCALE_VALUE = uiUtilsLib.DEFAULT_SCALE_VALUE;
  var MIN_SCALE = uiUtilsLib.MIN_SCALE;
  var MAX_SCALE = uiUtilsLib.MAX_SCALE;
  var ProgressBar = uiUtilsLib.ProgressBar;
  var getPDFFileNameFromURL = uiUtilsLib.getPDFFileNameFromURL;
  var noContextMenuHandler = uiUtilsLib.noContextMenuHandler;
  var mozL10n = uiUtilsLib.mozL10n;
  var parseQueryString = uiUtilsLib.parseQueryString;
  var PDFHistory = pdfHistoryLib.PDFHistory;
  var Preferences = preferencesLib.Preferences;
  var SidebarView = pdfSidebarLib.SidebarView;
  var PDFSidebar = pdfSidebarLib.PDFSidebar;
  var ViewHistory = viewHistoryLib.ViewHistory;
  var PDFThumbnailViewer = pdfThumbnailViewerLib.PDFThumbnailViewer;
  var Toolbar = toolbarLib.Toolbar;
  var SecondaryToolbar = secondaryToolbarLib.SecondaryToolbar;
  var PasswordPrompt = passwordPromptLib.PasswordPrompt;
  var PDFPresentationMode = pdfPresentationModeLib.PDFPresentationMode;
  var PDFDocumentProperties = pdfDocumentPropertiesLib.PDFDocumentProperties;
  var HandTool = handToolLib.HandTool;
  var PresentationModeState = pdfViewerLib.PresentationModeState;
  var PDFViewer = pdfViewerLib.PDFViewer;
  var RenderingStates = pdfRenderingQueueLib.RenderingStates;
  var PDFRenderingQueue = pdfRenderingQueueLib.PDFRenderingQueue;
  var PDFLinkService = pdfLinkServiceLib.PDFLinkService;
  var PDFOutlineViewer = pdfOutlineViewerLib.PDFOutlineViewer;
  var OverlayManager = overlayManagerLib.OverlayManager;
  var PDFAttachmentViewer = pdfAttachmentViewerLib.PDFAttachmentViewer;
  var PDFFindController = pdfFindControllerLib.PDFFindController;
  var PDFFindBar = pdfFindBarLib.PDFFindBar;
  var getGlobalEventBus = domEventsLib.getGlobalEventBus;
  var normalizeWheelEventDelta = uiUtilsLib.normalizeWheelEventDelta;
  var animationStarted = uiUtilsLib.animationStarted;
  var localized = uiUtilsLib.localized;
  var RendererType = uiUtilsLib.RendererType;
  
  var DEFAULT_SCALE_DELTA = 1.1;
  var DISABLE_AUTO_FETCH_LOADING_BAR_TIMEOUT = 5000;
  
  function configure(PDFJS) {
    PDFJS.imageResourcesPath = './images/';
    if (typeof PDFJSDev !== 'undefined' &&
        PDFJSDev.test('FIREFOX || MOZCENTRAL || GENERIC || CHROME')) {
      PDFJS.workerSrc = '../build/pdf.worker.js';
    }
    if (typeof PDFJSDev === 'undefined' || !PDFJSDev.test('PRODUCTION')) {
      PDFJS.cMapUrl = '../external/bcmaps/';
      PDFJS.cMapPacked = true;
      PDFJS.workerSrc = '../src/worker_loader.js';
      PDFJS.pdfjsNext = true;
    } else {
      PDFJS.cMapUrl = '../web/cmaps/';
      PDFJS.cMapPacked = true;
    }
  }
  
  var DefaultExernalServices = {
    updateFindControlState: function (data) {},
    initPassiveLoading: function (callbacks) {},
    fallback: function (data, callback) {},
    reportTelemetry: function (data) {},
    createDownloadManager: function () {
      return new downloadManagerLib.DownloadManager();
    },
    supportsIntegratedFind: false,
    supportsDocumentFonts: true,
    supportsDocumentColors: true,
    supportedMouseWheelZoomModifierKeys: {
      ctrlKey: true,
      metaKey: true,
    }
  };
  
  var PDFViewerApplication = {
    initialBookmark: document.location.hash.substring(1),
    initialDestination: null,
    initialized: false,
    fellback: false,
    appConfig: null,
    pdfDocument: null,
    pdfLoadingTask: null,
    printService: null,
    /** @type {PDFViewer} */
    pdfViewer: null,
    /** @type {PDFThumbnailViewer} */
    pdfThumbnailViewer: null,
    /** @type {PDFRenderingQueue} */
    pdfRenderingQueue: null,
    /** @type {PDFPresentationMode} */
    pdfPresentationMode: null,
    /** @type {PDFDocumentProperties} */
    pdfDocumentProperties: null,
    /** @type {PDFLinkService} */
    pdfLinkService: null,
    /** @type {PDFHistory} */
    pdfHistory: null,
    /** @type {PDFSidebar} */
    pdfSidebar: null,
    /** @type {PDFOutlineViewer} */
    pdfOutlineViewer: null,
    /** @type {PDFAttachmentViewer} */
    pdfAttachmentViewer: null,
    /** @type {ViewHistory} */
    store: null,
    /** @type {DownloadManager} */
    downloadManager: null,
    /** @type {Toolbar} */
    toolbar: null,
    /** @type {SecondaryToolbar} */
    secondaryToolbar: null,
    /** @type {EventBus} */
    eventBus: null,
    pageRotation: 0,
    isInitialViewSet: false,
    viewerPrefs: {
      sidebarViewOnLoad: SidebarView.NONE,
      pdfBugEnabled: false,
      showPreviousViewOnLoad: true,
      defaultZoomValue: '',
      disablePageLabels: false,
      renderer: 'canvas',
      enhanceTextSelection: false,
      renderInteractiveForms: false,
      enablePrintAutoRotate: false,
    },
    isViewerEmbedded: (window.parent !== window),
    url: '',
    baseUrl: '',
    externalServices: DefaultExernalServices,
  
    // called once when the document is loaded
    initialize: function pdfViewInitialize(appConfig) {
      var self = this;
      var PDFJS = pdfjsLib.PDFJS;
  
      Preferences.initialize();
      this.preferences = Preferences;
  
      configure(PDFJS);
      this.appConfig = appConfig;
  
      return this._readPreferences().then(function () {
        return self._initializeViewerComponents();
      }).then(function () {
        // Bind the various event handlers *after* the viewer has been
        // initialized, to prevent errors if an event arrives too soon.
        self.bindEvents();
        self.bindWindowEvents();
  
        if (typeof PDFJSDev === 'undefined' || PDFJSDev.test('GENERIC')) {
          // For backwards compatibility, we dispatch the 'localized' event on
          // the `eventBus` once the viewer has been initialized.
          localized.then(function () {
            self.eventBus.dispatch('localized');
          });
        }
  
        if (self.isViewerEmbedded && !PDFJS.isExternalLinkTargetSet()) {
          // Prevent external links from "replacing" the viewer,
          // when it's embedded in e.g. an iframe or an object.
          PDFJS.externalLinkTarget = PDFJS.LinkTarget.TOP;
        }
  
        self.initialized = true;
      });
    },
  
    /**
     * @private
     */
    _readPreferences: function () {
      var self = this;
      var PDFJS = pdfjsLib.PDFJS;
  
      return Promise.all([
        Preferences.get('enableWebGL').then(function resolved(value) {
          PDFJS.disableWebGL = !value;
        }),
        Preferences.get('sidebarViewOnLoad').then(function resolved(value) {
          self.viewerPrefs['sidebarViewOnLoad'] = value;
        }),
        Preferences.get('pdfBugEnabled').then(function resolved(value) {
          self.viewerPrefs['pdfBugEnabled'] = value;
        }),
        Preferences.get('showPreviousViewOnLoad').then(function resolved(value) {
          self.viewerPrefs['showPreviousViewOnLoad'] = value;
        }),
        Preferences.get('defaultZoomValue').then(function resolved(value) {
          self.viewerPrefs['defaultZoomValue'] = value;
        }),
        Preferences.get('enhanceTextSelection').then(function resolved(value) {
          self.viewerPrefs['enhanceTextSelection'] = value;
        }),
        Preferences.get('disableTextLayer').then(function resolved(value) {
          if (PDFJS.disableTextLayer === true) {
            return;
          }
          PDFJS.disableTextLayer = value;
        }),
        Preferences.get('disableRange').then(function resolved(value) {
          if (PDFJS.disableRange === true) {
            return;
          }
          PDFJS.disableRange = value;
        }),
        Preferences.get('disableStream').then(function resolved(value) {
          if (PDFJS.disableStream === true) {
            return;
          }
          PDFJS.disableStream = value;
        }),
        Preferences.get('disableAutoFetch').then(function resolved(value) {
          PDFJS.disableAutoFetch = value;
        }),
        Preferences.get('disableFontFace').then(function resolved(value) {
          if (PDFJS.disableFontFace === true) {
            return;
          }
          PDFJS.disableFontFace = value;
        }),
        Preferences.get('useOnlyCssZoom').then(function resolved(value) {
          PDFJS.useOnlyCssZoom = value;
        }),
        Preferences.get('externalLinkTarget').then(function resolved(value) {
          if (PDFJS.isExternalLinkTargetSet()) {
            return;
          }
          PDFJS.externalLinkTarget = value;
        }),
        Preferences.get('renderer').then(function resolved(value) {
          self.viewerPrefs['renderer'] = value;
        }),
        Preferences.get('renderInteractiveForms').then(function resolved(value) {
          self.viewerPrefs['renderInteractiveForms'] = value;
        }),
        Preferences.get('disablePageLabels').then(function resolved(value) {
          self.viewerPrefs['disablePageLabels'] = value;
        }),
        Preferences.get('enablePrintAutoRotate').then(function resolved(value) {
          self.viewerPrefs['enablePrintAutoRotate'] = value;
        }),
      ]).catch(function (reason) { });
    },
  
    /**
     * @private
     */
    _initializeViewerComponents: function () {
      var self = this;
      var appConfig = this.appConfig;
  
      return new Promise(function (resolve, reject) {
        var eventBus = appConfig.eventBus || getGlobalEventBus();
        self.eventBus = eventBus;
  
        var pdfRenderingQueue = new PDFRenderingQueue();
        pdfRenderingQueue.onIdle = self.cleanup.bind(self);
        self.pdfRenderingQueue = pdfRenderingQueue;
  
        var pdfLinkService = new PDFLinkService({
          eventBus: eventBus
        });
        self.pdfLinkService = pdfLinkService;
  
        var downloadManager = self.externalServices.createDownloadManager();
        self.downloadManager = downloadManager;
  
        var container = appConfig.mainContainer;
        var viewer = appConfig.viewerContainer;
        self.pdfViewer = new PDFViewer({
          container: container,
          viewer: viewer,
          eventBus: eventBus,
          renderingQueue: pdfRenderingQueue,
          linkService: pdfLinkService,
          downloadManager: downloadManager,
          renderer: self.viewerPrefs['renderer'],
          enhanceTextSelection: self.viewerPrefs['enhanceTextSelection'],
          renderInteractiveForms: self.viewerPrefs['renderInteractiveForms'],
          enablePrintAutoRotate: self.viewerPrefs['enablePrintAutoRotate'],
        });
        pdfRenderingQueue.setViewer(self.pdfViewer);
        pdfLinkService.setViewer(self.pdfViewer);
  
        var thumbnailContainer = appConfig.sidebar.thumbnailView;
        self.pdfThumbnailViewer = new PDFThumbnailViewer({
          container: thumbnailContainer,
          renderingQueue: pdfRenderingQueue,
          linkService: pdfLinkService,
        });
        pdfRenderingQueue.setThumbnailViewer(self.pdfThumbnailViewer);
  
        self.pdfHistory = new PDFHistory({
          linkService: pdfLinkService,
          eventBus: eventBus,
        });
        pdfLinkService.setHistory(self.pdfHistory);
  
        self.findController = new PDFFindController({
          pdfViewer: self.pdfViewer,
        });
        self.findController.onUpdateResultsCount = function (matchCount) {
          if (self.supportsIntegratedFind) {
            return;
          }
          self.findBar.updateResultsCount(matchCount);
        };
        self.findController.onUpdateState = function (state, previous,
                                                      matchCount) {
          if (self.supportsIntegratedFind) {
            self.externalServices.updateFindControlState(
              {result: state, findPrevious: previous});
          } else {
            self.findBar.updateUIState(state, previous, matchCount);
          }
        };
  
        self.pdfViewer.setFindController(self.findController);
  
        // FIXME better PDFFindBar constructor parameters
        var findBarConfig = Object.create(appConfig.findBar);
        findBarConfig.findController = self.findController;
        findBarConfig.eventBus = eventBus;
        self.findBar = new PDFFindBar(findBarConfig);
  
        self.overlayManager = OverlayManager;
  
        self.handTool = new HandTool({
          container: container,
          eventBus: eventBus,
        });
  
        self.pdfDocumentProperties =
          new PDFDocumentProperties(appConfig.documentProperties);
  
        self.toolbar = new Toolbar(appConfig.toolbar, container, eventBus);
  
        self.secondaryToolbar =
          new SecondaryToolbar(appConfig.secondaryToolbar, container, eventBus);
  
        if (self.supportsFullscreen) {
          self.pdfPresentationMode = new PDFPresentationMode({
            container: container,
            viewer: viewer,
            pdfViewer: self.pdfViewer,
            eventBus: eventBus,
            contextMenuItems: appConfig.fullscreen
          });
        }
  
        self.passwordPrompt = new PasswordPrompt(appConfig.passwordOverlay);
  
        self.pdfOutlineViewer = new PDFOutlineViewer({
          container: appConfig.sidebar.outlineView,
          eventBus: eventBus,
          linkService: pdfLinkService,
        });
  
        self.pdfAttachmentViewer = new PDFAttachmentViewer({
          container: appConfig.sidebar.attachmentsView,
          eventBus: eventBus,
          downloadManager: downloadManager,
        });
  
        // FIXME better PDFSidebar constructor parameters
        var sidebarConfig = Object.create(appConfig.sidebar);
        sidebarConfig.pdfViewer = self.pdfViewer;
        sidebarConfig.pdfThumbnailViewer = self.pdfThumbnailViewer;
        sidebarConfig.pdfOutlineViewer = self.pdfOutlineViewer;
        sidebarConfig.eventBus = eventBus;
        self.pdfSidebar = new PDFSidebar(sidebarConfig);
        self.pdfSidebar.onToggled = self.forceRendering.bind(self);
  
        resolve(undefined);
      });
    },
  
    run: function pdfViewRun(config) {
      this.initialize(config).then(webViewerInitialized);
    },
  
    zoomIn: function pdfViewZoomIn(ticks) {
      var newScale = this.pdfViewer.currentScale;
      do {
        newScale = (newScale * DEFAULT_SCALE_DELTA).toFixed(2);
        newScale = Math.ceil(newScale * 10) / 10;
        newScale = Math.min(MAX_SCALE, newScale);
      } while (--ticks > 0 && newScale < MAX_SCALE);
      this.pdfViewer.currentScaleValue = newScale;
    },
  
    zoomOut: function pdfViewZoomOut(ticks) {
      var newScale = this.pdfViewer.currentScale;
      do {
        newScale = (newScale / DEFAULT_SCALE_DELTA).toFixed(2);
        newScale = Math.floor(newScale * 10) / 10;
        newScale = Math.max(MIN_SCALE, newScale);
      } while (--ticks > 0 && newScale > MIN_SCALE);
      this.pdfViewer.currentScaleValue = newScale;
    },
  
    get pagesCount() {
      return this.pdfDocument ? this.pdfDocument.numPages : 0;
    },
  
    set page(val) {
      this.pdfViewer.currentPageNumber = val;
    },
  
    get page() {
      return this.pdfViewer.currentPageNumber;
    },
  
    get printing() {
      return !!this.printService;
    },
  
    get supportsPrinting() {
      return PDFPrintServiceFactory.instance.supportsPrinting;
    },
  
    get supportsFullscreen() {
      var support;
      if (typeof PDFJSDev !== 'undefined' && PDFJSDev.test('MOZCENTRAL')) {
        support = document.fullscreenEnabled === true ||
                  document.mozFullScreenEnabled === true;
      } else {
        var doc = document.documentElement;
        support = !!(doc.requestFullscreen || doc.mozRequestFullScreen ||
                     doc.webkitRequestFullScreen || doc.msRequestFullscreen);
  
        if (document.fullscreenEnabled === false ||
            document.mozFullScreenEnabled === false ||
            document.webkitFullscreenEnabled === false ||
            document.msFullscreenEnabled === false) {
          support = false;
        }
      }
      if (support && pdfjsLib.PDFJS.disableFullscreen === true) {
        support = false;
      }
  
      return pdfjsLib.shadow(this, 'supportsFullscreen', support);
    },
  
    get supportsIntegratedFind() {
      return this.externalServices.supportsIntegratedFind;
    },
  
    get supportsDocumentFonts() {
      return this.externalServices.supportsDocumentFonts;
    },
  
    get supportsDocumentColors() {
      return this.externalServices.supportsDocumentColors;
    },
  
    get loadingBar() {
      var bar = new ProgressBar('#loadingBar', {});
  
      return pdfjsLib.shadow(this, 'loadingBar', bar);
    },
  
    get supportedMouseWheelZoomModifierKeys() {
      return this.externalServices.supportedMouseWheelZoomModifierKeys;
    },
  
    initPassiveLoading: function pdfViewInitPassiveLoading() {
      if (typeof PDFJSDev !== 'undefined' &&
          PDFJSDev.test('FIREFOX || MOZCENTRAL || CHROME')) {
        this.externalServices.initPassiveLoading({
          onOpenWithTransport: function (url, length, transport) {
            PDFViewerApplication.open(url, {range: transport});
  
            if (length) {
              PDFViewerApplication.pdfDocumentProperties.setFileSize(length);
            }
          },
          onOpenWithData: function (data) {
            PDFViewerApplication.open(data);
          },
          onOpenWithURL: function (url, length, originalURL) {
            var file = url, args = null;
            if (length !== undefined) {
              args = {length: length};
            }
            if (originalURL !== undefined) {
              file = {file: url, originalURL: originalURL};
            }
            PDFViewerApplication.open(file, args);
          },
          onError: function (e) {
            PDFViewerApplication.error(mozL10n.get('loading_error', null,
              'An error occurred while loading the PDF.'), e);
          },
          onProgress: function (loaded, total) {
            PDFViewerApplication.progress(loaded / total);
          }
        });
      } else {
        throw new Error('Not implemented: initPassiveLoading');
      }
    },
  
    setTitleUsingUrl: function pdfViewSetTitleUsingUrl(url) {
      this.url = url;
      this.baseUrl = url.split('#')[0];
      var title = getPDFFileNameFromURL(url, '');
      if (!title) {
        try {
          title = decodeURIComponent(pdfjsLib.getFilenameFromUrl(url)) || url;
        } catch (e) {
          // decodeURIComponent may throw URIError,
          // fall back to using the unprocessed url in that case
          title = url;
        }
      }
      this.setTitle(title);
    },
  
    setTitle: function pdfViewSetTitle(title) {
      if (this.isViewerEmbedded) {
        // Embedded PDF viewers should not be changing their parent page's title.
        return;
      }
      document.title = title;
    },
  
    /**
     * Closes opened PDF document.
     * @returns {Promise} - Returns the promise, which is resolved when all
     *                      destruction is completed.
     */
    close: function pdfViewClose() {
      var errorWrapper = this.appConfig.errorWrapper.container;
      errorWrapper.setAttribute('hidden', 'true');
  
      if (!this.pdfLoadingTask) {
        return Promise.resolve();
      }
  
      var promise = this.pdfLoadingTask.destroy();
      this.pdfLoadingTask = null;
  
      if (this.pdfDocument) {
        this.pdfDocument = null;
  
        this.pdfThumbnailViewer.setDocument(null);
        this.pdfViewer.setDocument(null);
        this.pdfLinkService.setDocument(null, null);
      }
      this.store = null;
      this.isInitialViewSet = false;
  
      this.pdfSidebar.reset();
      this.pdfOutlineViewer.reset();
      this.pdfAttachmentViewer.reset();
  
      this.findController.reset();
      this.findBar.reset();
      this.toolbar.reset();
      this.secondaryToolbar.reset();
  
      if (typeof PDFBug !== 'undefined') {
        PDFBug.cleanup();
      }
      return promise;
    },
  
    /**
     * Opens PDF document specified by URL or array with additional arguments.
     * @param {string|TypedArray|ArrayBuffer} file - PDF location or binary data.
     * @param {Object} args - (optional) Additional arguments for the getDocument
     *                        call, e.g. HTTP headers ('httpHeaders') or
     *                        alternative data transport ('range').
     * @returns {Promise} - Returns the promise, which is resolved when document
     *                      is opened.
     */
    open: function pdfViewOpen(file, args) {
      if ((typeof PDFJSDev === 'undefined' || PDFJSDev.test('GENERIC')) &&
          (arguments.length > 2 || typeof args === 'number')) {
        return Promise.reject(
          new Error('Call of open() with obsolete signature.'));
      }
      if (this.pdfLoadingTask) {
        // We need to destroy already opened document.
        return this.close().then(function () {
          // Reload the preferences if a document was previously opened.
          Preferences.reload();
          // ... and repeat the open() call.
          return this.open(file, args);
        }.bind(this));
      }
  
      var parameters = Object.create(null), scale;
      if (typeof file === 'string') { // URL
        this.setTitleUsingUrl(file);
        parameters.url = file;
      } else if (file && 'byteLength' in file) { // ArrayBuffer
        parameters.data = file;
      } else if (file.url && file.originalUrl) {
        this.setTitleUsingUrl(file.originalUrl);
        parameters.url = file.url;
      }
      if (typeof PDFJSDev !== 'undefined' &&
          PDFJSDev.test('FIREFOX || MOZCENTRAL || CHROME')) {
        parameters.docBaseUrl = this.baseUrl;
      }
  
      if (args) {
        for (var prop in args) {
          parameters[prop] = args[prop];
        }
  
        if (args.scale) {
          scale = args.scale;
        }
        if (args.length) {
          this.pdfDocumentProperties.setFileSize(args.length);
        }
      }
  
      var self = this;
      self.downloadComplete = false;
  
      var loadingTask = pdfjsLib.getDocument(parameters);
      this.pdfLoadingTask = loadingTask;
  
      loadingTask.onPassword = function passwordNeeded(updateCallback, reason) {
        self.passwordPrompt.setUpdateCallback(updateCallback, reason);
        self.passwordPrompt.open();
      };
  
      loadingTask.onProgress = function getDocumentProgress(progressData) {
        self.progress(progressData.loaded / progressData.total);
      };
  
      // Listen for unsupported features to trigger the fallback UI.
      loadingTask.onUnsupportedFeature = this.fallback.bind(this);
  
      return loadingTask.promise.then(
        function getDocumentCallback(pdfDocument) {
          self.load(pdfDocument, scale);
        },
        function getDocumentError(exception) {
          var message = exception && exception.message;
          var loadingErrorMessage = mozL10n.get('loading_error', null,
            'An error occurred while loading the PDF.');
  
          if (exception instanceof pdfjsLib.InvalidPDFException) {
            // change error message also for other builds
            loadingErrorMessage = mozL10n.get('invalid_file_error', null,
                                              'Invalid or corrupted PDF file.');
          } else if (exception instanceof pdfjsLib.MissingPDFException) {
            // special message for missing PDF's
            loadingErrorMessage = mozL10n.get('missing_file_error', null,
                                              'Missing PDF file.');
          } else if (exception instanceof pdfjsLib.UnexpectedResponseException) {
            loadingErrorMessage = mozL10n.get('unexpected_response_error', null,
                                              'Unexpected server response.');
          }
  
          var moreInfo = {
            message: message
          };
          self.error(loadingErrorMessage, moreInfo);
  
          throw new Error(loadingErrorMessage);
        }
      );
    },
  
    download: function pdfViewDownload() {
      function downloadByUrl() {
        downloadManager.downloadUrl(url, filename);
      }
  
      var url = this.baseUrl;
      // Use this.url instead of this.baseUrl to perform filename detection based
      // on the reference fragment as ultimate fallback if needed.
      var filename = getPDFFileNameFromURL(this.url);
      var downloadManager = this.downloadManager;
      downloadManager.onerror = function (err) {
        // This error won't really be helpful because it's likely the
        // fallback won't work either (or is already open).
        PDFViewerApplication.error('PDF failed to download.');
      };
  
      if (!this.pdfDocument) { // the PDF is not ready yet
        downloadByUrl();
        return;
      }
  
      if (!this.downloadComplete) { // the PDF is still downloading
        downloadByUrl();
        return;
      }
  
      this.pdfDocument.getData().then(
        function getDataSuccess(data) {
          var blob = pdfjsLib.createBlob(data, 'application/pdf');
          downloadManager.download(blob, url, filename);
        },
        downloadByUrl // Error occurred try downloading with just the url.
      ).then(null, downloadByUrl);
    },
  
    fallback: function pdfViewFallback(featureId) {
      if (typeof PDFJSDev !== 'undefined' &&
          PDFJSDev.test('FIREFOX || MOZCENTRAL')) {
        // Only trigger the fallback once so we don't spam the user with messages
        // for one PDF.
        if (this.fellback) {
          return;
        }
        this.fellback = true;
        this.externalServices.fallback({
          featureId: featureId,
          url: this.baseUrl,
        }, function response(download) {
          if (!download) {
            return;
          }
          PDFViewerApplication.download();
        });
      }
    },
  
    /**
     * Show the error box.
     * @param {String} message A message that is human readable.
     * @param {Object} moreInfo (optional) Further information about the error
     *                            that is more technical.  Should have a 'message'
     *                            and optionally a 'stack' property.
     */
    error: function pdfViewError(message, moreInfo) {
      var moreInfoText = mozL10n.get('error_version_info',
        {version: pdfjsLib.version || '?', build: pdfjsLib.build || '?'},
        'PDF.js v{{version}} (build: {{build}})') + '\n';
      if (moreInfo) {
        moreInfoText +=
          mozL10n.get('error_message', {message: moreInfo.message},
          'Message: {{message}}');
        if (moreInfo.stack) {
          moreInfoText += '\n' +
            mozL10n.get('error_stack', {stack: moreInfo.stack},
            'Stack: {{stack}}');
        } else {
          if (moreInfo.filename) {
            moreInfoText += '\n' +
              mozL10n.get('error_file', {file: moreInfo.filename},
              'File: {{file}}');
          }
          if (moreInfo.lineNumber) {
            moreInfoText += '\n' +
              mozL10n.get('error_line', {line: moreInfo.lineNumber},
              'Line: {{line}}');
          }
        }
      }
  
      if (typeof PDFJSDev === 'undefined' ||
          !PDFJSDev.test('FIREFOX || MOZCENTRAL')) {
        var errorWrapperConfig = this.appConfig.errorWrapper;
        var errorWrapper = errorWrapperConfig.container;
        errorWrapper.removeAttribute('hidden');
  
        var errorMessage = errorWrapperConfig.errorMessage;
        errorMessage.textContent = message;
  
        var closeButton = errorWrapperConfig.closeButton;
        closeButton.onclick = function() {
          errorWrapper.setAttribute('hidden', 'true');
        };
  
        var errorMoreInfo = errorWrapperConfig.errorMoreInfo;
        var moreInfoButton = errorWrapperConfig.moreInfoButton;
        var lessInfoButton = errorWrapperConfig.lessInfoButton;
        moreInfoButton.onclick = function() {
          errorMoreInfo.removeAttribute('hidden');
          moreInfoButton.setAttribute('hidden', 'true');
          lessInfoButton.removeAttribute('hidden');
          errorMoreInfo.style.height = errorMoreInfo.scrollHeight + 'px';
        };
        lessInfoButton.onclick = function() {
          errorMoreInfo.setAttribute('hidden', 'true');
          moreInfoButton.removeAttribute('hidden');
          lessInfoButton.setAttribute('hidden', 'true');
        };
        moreInfoButton.oncontextmenu = noContextMenuHandler;
        lessInfoButton.oncontextmenu = noContextMenuHandler;
        closeButton.oncontextmenu = noContextMenuHandler;
        moreInfoButton.removeAttribute('hidden');
        lessInfoButton.setAttribute('hidden', 'true');
        errorMoreInfo.value = moreInfoText;
      } else {
        console.error(message + '\n' + moreInfoText);
        this.fallback();
      }
    },
  
    progress: function pdfViewProgress(level) {
      var percent = Math.round(level * 100);
      // When we transition from full request to range requests, it's possible
      // that we discard some of the loaded data. This can cause the loading
      // bar to move backwards. So prevent this by only updating the bar if it
      // increases.
      if (percent > this.loadingBar.percent || isNaN(percent)) {
        this.loadingBar.percent = percent;
  
        // When disableAutoFetch is enabled, it's not uncommon for the entire file
        // to never be fetched (depends on e.g. the file structure). In this case
        // the loading bar will not be completely filled, nor will it be hidden.
        // To prevent displaying a partially filled loading bar permanently, we
        // hide it when no data has been loaded during a certain amount of time.
        if (pdfjsLib.PDFJS.disableAutoFetch && percent) {
          if (this.disableAutoFetchLoadingBarTimeout) {
            clearTimeout(this.disableAutoFetchLoadingBarTimeout);
            this.disableAutoFetchLoadingBarTimeout = null;
          }
          this.loadingBar.show();
  
          this.disableAutoFetchLoadingBarTimeout = setTimeout(function () {
            this.loadingBar.hide();
            this.disableAutoFetchLoadingBarTimeout = null;
          }.bind(this), DISABLE_AUTO_FETCH_LOADING_BAR_TIMEOUT);
        }
      }
    },
  
    load: function pdfViewLoad(pdfDocument, scale) {
      var self = this;
      scale = scale || UNKNOWN_SCALE;
  
      this.pdfDocument = pdfDocument;
  
      this.pdfDocumentProperties.setDocumentAndUrl(pdfDocument, this.url);
  
      var downloadedPromise = pdfDocument.getDownloadInfo().then(function() {
        self.downloadComplete = true;
        self.loadingBar.hide();
      });
  
      this.toolbar.setPagesCount(pdfDocument.numPages, false);
      this.secondaryToolbar.setPagesCount(pdfDocument.numPages);
  
      var id = this.documentFingerprint = pdfDocument.fingerprint;
      var store = this.store = new ViewHistory(id);
  
      var baseDocumentUrl;
      if (typeof PDFJSDev === 'undefined' || PDFJSDev.test('GENERIC')) {
        baseDocumentUrl = null;
      } else if (PDFJSDev.test('FIREFOX || MOZCENTRAL')) {
        baseDocumentUrl = this.baseUrl;
      } else if (PDFJSDev.test('CHROME')) {
        baseDocumentUrl = location.href.split('#')[0];
      }
      this.pdfLinkService.setDocument(pdfDocument, baseDocumentUrl);
  
      var pdfViewer = this.pdfViewer;
      pdfViewer.currentScale = scale;
      pdfViewer.setDocument(pdfDocument);
      var firstPagePromise = pdfViewer.firstPagePromise;
      var pagesPromise = pdfViewer.pagesPromise;
      var onePageRendered = pdfViewer.onePageRendered;
  
      this.pageRotation = 0;
  
      var pdfThumbnailViewer = this.pdfThumbnailViewer;
      pdfThumbnailViewer.setDocument(pdfDocument);
  
      firstPagePromise.then(function(pdfPage) {
        downloadedPromise.then(function () {
          self.eventBus.dispatch('documentload', {source: self});
        });
  
        self.loadingBar.setWidth(self.appConfig.viewerContainer);
  
        if (!pdfjsLib.PDFJS.disableHistory && !self.isViewerEmbedded) {
          // The browsing history is only enabled when the viewer is standalone,
          // i.e. not when it is embedded in a web page.
          if (!self.viewerPrefs['showPreviousViewOnLoad']) {
            self.pdfHistory.clearHistoryState();
          }
          self.pdfHistory.initialize(self.documentFingerprint);
  
          if (self.pdfHistory.initialDestination) {
            self.initialDestination = self.pdfHistory.initialDestination;
          } else if (self.pdfHistory.initialBookmark) {
            self.initialBookmark = self.pdfHistory.initialBookmark;
          }
        }
  
        var initialParams = {
          destination: self.initialDestination,
          bookmark: self.initialBookmark,
          hash: null,
        };
  
        store.initializedPromise.then(function resolved() {
          var storedHash = null, sidebarView = null;
          if (self.viewerPrefs['showPreviousViewOnLoad'] &&
              store.get('exists', false)) {
            var pageNum = store.get('page', '1');
            var zoom = self.viewerPrefs['defaultZoomValue'] ||
                       store.get('zoom', DEFAULT_SCALE_VALUE);
            var left = store.get('scrollLeft', '0');
            var top = store.get('scrollTop', '0');
  
            storedHash = 'page=' + pageNum + '&zoom=' + zoom + ',' +
                         left + ',' + top;
  
            sidebarView = store.get('sidebarView', SidebarView.NONE);
          } else if (self.viewerPrefs['defaultZoomValue']) {
            storedHash = 'page=1&zoom=' + self.viewerPrefs['defaultZoomValue'];
          }
          self.setInitialView(storedHash,
            { scale: scale, sidebarView: sidebarView });
  
          initialParams.hash = storedHash;
  
          // Make all navigation keys work on document load,
          // unless the viewer is embedded in a web page.
          if (!self.isViewerEmbedded) {
            self.pdfViewer.focus();
          }
        }, function rejected(reason) {
          console.error(reason);
          self.setInitialView(null, { scale: scale });
        });
  
        // For documents with different page sizes,
        // ensure that the correct location becomes visible on load.
        pagesPromise.then(function resolved() {
          if (!initialParams.destination && !initialParams.bookmark &&
              !initialParams.hash) {
            return;
          }
          if (self.hasEqualPageSizes) {
            return;
          }
          self.initialDestination = initialParams.destination;
          self.initialBookmark = initialParams.bookmark;
  
          self.pdfViewer.currentScaleValue = self.pdfViewer.currentScaleValue;
          self.setInitialView(initialParams.hash);
        });
      });
  
      pdfDocument.getPageLabels().then(function (labels) {
        if (!labels || self.viewerPrefs['disablePageLabels']) {
          return;
        }
        var i = 0, numLabels = labels.length;
        if (numLabels !== self.pagesCount) {
          console.error('The number of Page Labels does not match ' +
                        'the number of pages in the document.');
          return;
        }
        // Ignore page labels that correspond to standard page numbering.
        while (i < numLabels && labels[i] === (i + 1).toString()) {
          i++;
        }
        if (i === numLabels) {
          return;
        }
  
        pdfViewer.setPageLabels(labels);
        pdfThumbnailViewer.setPageLabels(labels);
  
        // Changing toolbar page display to use labels and we need to set
        // the label of the current page.
        self.toolbar.setPagesCount(pdfDocument.numPages, true);
        self.toolbar.setPageNumber(pdfViewer.currentPageNumber,
                                   pdfViewer.currentPageLabel);
      });
  
      pagesPromise.then(function() {
        if (self.supportsPrinting) {
          pdfDocument.getJavaScript().then(function(javaScript) {
            if (javaScript.length) {
              console.warn('Warning: JavaScript is not supported');
              self.fallback(pdfjsLib.UNSUPPORTED_FEATURES.javaScript);
            }
            // Hack to support auto printing.
            var regex = /\bprint\s*\(/;
            for (var i = 0, ii = javaScript.length; i < ii; i++) {
              var js = javaScript[i];
              if (js && regex.test(js)) {
                setTimeout(function() {
                  window.print();
                });
                return;
              }
            }
          });
        }
      });
  
      Promise.all([onePageRendered, animationStarted]).then(function() {
        pdfDocument.getOutline().then(function(outline) {
          self.pdfOutlineViewer.render({ outline: outline });
        });
        pdfDocument.getAttachments().then(function(attachments) {
          self.pdfAttachmentViewer.render({ attachments: attachments });
        });
      });
  
      pdfDocument.getMetadata().then(function(data) {
        var info = data.info, metadata = data.metadata;
        self.documentInfo = info;
        self.metadata = metadata;
  
        // Provides some basic debug information
        console.log('PDF ' + pdfDocument.fingerprint + ' [' +
                    info.PDFFormatVersion + ' ' + (info.Producer || '-').trim() +
                    ' / ' + (info.Creator || '-').trim() + ']' +
                    ' (PDF.js: ' + (pdfjsLib.version || '-') +
                    (!pdfjsLib.PDFJS.disableWebGL ? ' [WebGL]' : '') + ')');
  
        var pdfTitle;
        if (metadata && metadata.has('dc:title')) {
          var title = metadata.get('dc:title');
          // Ghostscript sometimes return 'Untitled', sets the title to 'Untitled'
          if (title !== 'Untitled') {
            pdfTitle = title;
          }
        }
  
        if (!pdfTitle && info && info['Title']) {
          pdfTitle = info['Title'];
        }
  
        if (pdfTitle) {
          self.setTitle(pdfTitle + ' - ' + document.title);
        }
  
        if (info.IsAcroFormPresent) {
          console.warn('Warning: AcroForm/XFA is not supported');
          self.fallback(pdfjsLib.UNSUPPORTED_FEATURES.forms);
        }
  
        if (typeof PDFJSDev !== 'undefined' &&
            PDFJSDev.test('FIREFOX || MOZCENTRAL')) {
          var versionId = String(info.PDFFormatVersion).slice(-1) | 0;
          var generatorId = 0;
          var KNOWN_GENERATORS = [
            'acrobat distiller', 'acrobat pdfwriter', 'adobe livecycle',
            'adobe pdf library', 'adobe photoshop', 'ghostscript', 'tcpdf',
            'cairo', 'dvipdfm', 'dvips', 'pdftex', 'pdfkit', 'itext', 'prince',
            'quarkxpress', 'mac os x', 'microsoft', 'openoffice', 'oracle',
            'luradocument', 'pdf-xchange', 'antenna house', 'aspose.cells', 'fpdf'
          ];
          if (info.Producer) {
            KNOWN_GENERATORS.some(function (generator, s, i) {
              if (generator.indexOf(s) < 0) {
                return false;
              }
              generatorId = i + 1;
              return true;
            }.bind(null, info.Producer.toLowerCase()));
          }
          var formType = !info.IsAcroFormPresent ? null : info.IsXFAPresent ?
                        'xfa' : 'acroform';
          self.externalServices.reportTelemetry({
            type: 'documentInfo',
            version: versionId,
            generator: generatorId,
            formType: formType
          });
        }
      });
    },
  
    setInitialView: function pdfViewSetInitialView(storedHash, options) {
      var scale = options && options.scale;
      var sidebarView = options && options.sidebarView;
  
      this.isInitialViewSet = true;
  
      this.pdfSidebar.setInitialView(this.viewerPrefs['sidebarViewOnLoad'] ||
                                     (sidebarView | 0));
  
      if (this.initialDestination) {
        this.pdfLinkService.navigateTo(this.initialDestination);
        this.initialDestination = null;
      } else if (this.initialBookmark) {
        this.pdfLinkService.setHash(this.initialBookmark);
        this.pdfHistory.push({ hash: this.initialBookmark }, true);
        this.initialBookmark = null;
      } else if (storedHash) {
        this.pdfLinkService.setHash(storedHash);
      } else if (scale) {
        this.pdfViewer.currentScaleValue = scale;
        this.page = 1;
      }
  
      // Ensure that the correct page number is displayed in the UI,
      // even if the active page didn't change during document load.
      this.toolbar.setPageNumber(this.pdfViewer.currentPageNumber,
                                 this.pdfViewer.currentPageLabel);
      this.secondaryToolbar.setPageNumber(this.pdfViewer.currentPageNumber);
  
      if (!this.pdfViewer.currentScaleValue) {
        // Scale was not initialized: invalid bookmark or scale was not specified.
        // Setting the default one.
        this.pdfViewer.currentScaleValue = DEFAULT_SCALE_VALUE;
      }
    },
  
    cleanup: function pdfViewCleanup() {
      if (!this.pdfDocument) {
        return; // run cleanup when document is loaded
      }
      this.pdfViewer.cleanup();
      this.pdfThumbnailViewer.cleanup();
  
      // We don't want to remove fonts used by active page SVGs.
      if (this.pdfViewer.renderer !== RendererType.SVG) {
        this.pdfDocument.cleanup();
      }
    },
  
    forceRendering: function pdfViewForceRendering() {
      this.pdfRenderingQueue.printing = this.printing;
      this.pdfRenderingQueue.isThumbnailViewEnabled =
        this.pdfSidebar.isThumbnailViewVisible;
      this.pdfRenderingQueue.renderHighestPriority();
    },
  
    beforePrint: function pdfViewSetupBeforePrint() {
      if (this.printService) {
        // There is no way to suppress beforePrint/afterPrint events,
        // but PDFPrintService may generate double events -- this will ignore
        // the second event that will be coming from native window.print().
        return;
      }
  
      if (!this.supportsPrinting) {
        var printMessage = mozL10n.get('printing_not_supported', null,
            'Warning: Printing is not fully supported by this browser.');
        this.error(printMessage);
        return;
      }
  
      // The beforePrint is a sync method and we need to know layout before
      // returning from this method. Ensure that we can get sizes of the pages.
      if (!this.pdfViewer.pageViewsReady) {
        var notReadyMessage = mozL10n.get('printing_not_ready', null,
            'Warning: The PDF is not fully loaded for printing.');
        window.alert(notReadyMessage);
        return;
      }
  
      var pagesOverview = this.pdfViewer.getPagesOverview();
      var printContainer = this.appConfig.printContainer;
      var printService = PDFPrintServiceFactory.instance.createPrintService(
        this.pdfDocument, pagesOverview, printContainer);
      this.printService = printService;
      this.forceRendering();
  
      printService.layout();
  
      if (typeof PDFJSDev !== 'undefined' &&
          PDFJSDev.test('FIREFOX || MOZCENTRAL')) {
        this.externalServices.reportTelemetry({
          type: 'print'
        });
      }
    },
  
    // Whether all pages of the PDF have the same width and height.
    get hasEqualPageSizes() {
      var firstPage = this.pdfViewer.getPageView(0);
      for (var i = 1, ii = this.pagesCount; i < ii; ++i) {
        var pageView = this.pdfViewer.getPageView(i);
        if (pageView.width !== firstPage.width ||
            pageView.height !== firstPage.height) {
          return false;
        }
      }
      return true;
    },
  
    afterPrint: function pdfViewSetupAfterPrint() {
      if (this.printService) {
        this.printService.destroy();
        this.printService = null;
      }
      this.forceRendering();
    },
  
    rotatePages: function pdfViewRotatePages(delta) {
      var pageNumber = this.page;
      this.pageRotation = (this.pageRotation + 360 + delta) % 360;
      this.pdfViewer.pagesRotation = this.pageRotation;
      this.pdfThumbnailViewer.pagesRotation = this.pageRotation;
  
      this.forceRendering();
  
      this.pdfViewer.currentPageNumber = pageNumber;
    },
  
    requestPresentationMode: function pdfViewRequestPresentationMode() {
      if (!this.pdfPresentationMode) {
        return;
      }
      this.pdfPresentationMode.request();
    },
  
    bindEvents: function pdfViewBindEvents() {
      var eventBus = this.eventBus;
  
      eventBus.on('resize', webViewerResize);
      eventBus.on('hashchange', webViewerHashchange);
      eventBus.on('beforeprint', this.beforePrint.bind(this));
      eventBus.on('afterprint', this.afterPrint.bind(this));
      eventBus.on('pagerendered', webViewerPageRendered);
      eventBus.on('textlayerrendered', webViewerTextLayerRendered);
      eventBus.on('updateviewarea', webViewerUpdateViewarea);
      eventBus.on('pagechanging', webViewerPageChanging);
      eventBus.on('scalechanging', webViewerScaleChanging);
      eventBus.on('sidebarviewchanged', webViewerSidebarViewChanged);
      eventBus.on('pagemode', webViewerPageMode);
      eventBus.on('namedaction', webViewerNamedAction);
      eventBus.on('presentationmodechanged', webViewerPresentationModeChanged);
      eventBus.on('presentationmode', webViewerPresentationMode);
      eventBus.on('openfile', webViewerOpenFile);
      eventBus.on('print', webViewerPrint);
      eventBus.on('download', webViewerDownload);
      eventBus.on('firstpage', webViewerFirstPage);
      eventBus.on('lastpage', webViewerLastPage);
      eventBus.on('nextpage', webViewerNextPage);
      eventBus.on('previouspage', webViewerPreviousPage);
      eventBus.on('zoomin', webViewerZoomIn);
      eventBus.on('zoomout', webViewerZoomOut);
      eventBus.on('pagenumberchanged', webViewerPageNumberChanged);
      eventBus.on('scalechanged', webViewerScaleChanged);
      eventBus.on('rotatecw', webViewerRotateCw);
      eventBus.on('rotateccw', webViewerRotateCcw);
      eventBus.on('documentproperties', webViewerDocumentProperties);
      eventBus.on('find', webViewerFind);
      eventBus.on('findfromurlhash', webViewerFindFromUrlHash);
      if (typeof PDFJSDev === 'undefined' || PDFJSDev.test('GENERIC')) {
        eventBus.on('fileinputchange', webViewerFileInputChange);
      }
    },
  
    bindWindowEvents: function pdfViewBindWindowEvents() {
      var eventBus = this.eventBus;
  
      window.addEventListener('wheel', webViewerWheel);
      window.addEventListener('click', webViewerClick);
      window.addEventListener('keydown', webViewerKeyDown);
  
      window.addEventListener('resize', function windowResize() {
        eventBus.dispatch('resize');
      });
      window.addEventListener('hashchange', function windowHashChange() {
        eventBus.dispatch('hashchange', {
          hash: document.location.hash.substring(1),
        });
      });
      window.addEventListener('beforeprint', function windowBeforePrint() {
        eventBus.dispatch('beforeprint');
      });
      window.addEventListener('afterprint', function windowAfterPrint() {
        eventBus.dispatch('afterprint');
      });
      if (typeof PDFJSDev === 'undefined' || PDFJSDev.test('GENERIC')) {
        window.addEventListener('change', function windowChange(evt) {
          var files = evt.target.files;
          if (!files || files.length === 0) {
            return;
          }
          eventBus.dispatch('fileinputchange', {
            fileInput: evt.target,
          });
        });
      }
    },
  };
  
  var validateFileURL;
  if (typeof PDFJSDev === 'undefined' || PDFJSDev.test('GENERIC')) {
    var HOSTED_VIEWER_ORIGINS = ['null',
      'http://mozilla.github.io', 'https://mozilla.github.io'];
    validateFileURL = function validateFileURL(file) {
      try {
        var viewerOrigin = new URL(window.location.href).origin || 'null';
        if (HOSTED_VIEWER_ORIGINS.indexOf(viewerOrigin) >= 0) {
          // Hosted or local viewer, allow for any file locations
          return;
        }
        var fileOrigin = new URL(file, window.location.href).origin;
        // Removing of the following line will not guarantee that the viewer will
        // start accepting URLs from foreign origin -- CORS headers on the remote
        // server must be properly configured.
        if (fileOrigin !== viewerOrigin) {
          throw new Error('file origin does not match viewer\'s');
        }
      } catch (e) {
        var message = e && e.message;
        var loadingErrorMessage = mozL10n.get('loading_error', null,
          'An error occurred while loading the PDF.');
  
        var moreInfo = {
          message: message
        };
        PDFViewerApplication.error(loadingErrorMessage, moreInfo);
        throw e;
      }
    };
  }
  
  function loadAndEnablePDFBug(enabledTabs) {
    return new Promise(function (resolve, reject) {
      var appConfig = PDFViewerApplication.appConfig;
      var script = document.createElement('script');
      script.src = appConfig.debuggerScriptPath;
      script.onload = function () {
        PDFBug.enable(enabledTabs);
        PDFBug.init(pdfjsLib, appConfig.mainContainer);
        resolve();
      };
      script.onerror = function () {
        reject(new Error('Cannot load debugger at ' + script.src));
      };
      (document.getElementsByTagName('head')[0] || document.body).
        appendChild(script);
    });
  }
  
  function webViewerInitialized() {
    var appConfig = PDFViewerApplication.appConfig;
    var file;
    if (typeof PDFJSDev === 'undefined' || PDFJSDev.test('GENERIC')) {
      var queryString = document.location.search.substring(1);
      var params = parseQueryString(queryString);
      file = 'file' in params ? params.file : appConfig.defaultUrl;
      validateFileURL(file);
    } else if (PDFJSDev.test('FIREFOX || MOZCENTRAL')) {
      file = window.location.href.split('#')[0];
    } else if (PDFJSDev.test('CHROME')) {
      file = appConfig.defaultUrl;
    }
  
    var waitForBeforeOpening = [];
    if (typeof PDFJSDev === 'undefined' || PDFJSDev.test('GENERIC')) {
      var fileInput = document.createElement('input');
      fileInput.id = appConfig.openFileInputName;
      fileInput.className = 'fileInput';
      fileInput.setAttribute('type', 'file');
      fileInput.oncontextmenu = noContextMenuHandler;
      document.body.appendChild(fileInput);
  
      if (!window.File || !window.FileReader ||
          !window.FileList || !window.Blob) {
        appConfig.toolbar.openFile.setAttribute('hidden', 'true');
        appConfig.secondaryToolbar.openFileButton.setAttribute('hidden', 'true');
      } else {
        fileInput.value = null;
      }
    } else {
      appConfig.toolbar.openFile.setAttribute('hidden', 'true');
      appConfig.secondaryToolbar.openFileButton.setAttribute('hidden', 'true');
    }
  
    var PDFJS = pdfjsLib.PDFJS;
  
    if ((typeof PDFJSDev === 'undefined' || !PDFJSDev.test('PRODUCTION')) ||
        PDFViewerApplication.viewerPrefs['pdfBugEnabled']) {
      // Special debugging flags in the hash section of the URL.
      var hash = document.location.hash.substring(1);
      var hashParams = parseQueryString(hash);
  
      if ('disableworker' in hashParams) {
        PDFJS.disableWorker = (hashParams['disableworker'] === 'true');
      }
      if ('disablerange' in hashParams) {
        PDFJS.disableRange = (hashParams['disablerange'] === 'true');
      }
      if ('disablestream' in hashParams) {
        PDFJS.disableStream = (hashParams['disablestream'] === 'true');
      }
      if ('disableautofetch' in hashParams) {
        PDFJS.disableAutoFetch = (hashParams['disableautofetch'] === 'true');
      }
      if ('disablefontface' in hashParams) {
        PDFJS.disableFontFace = (hashParams['disablefontface'] === 'true');
      }
      if ('disablehistory' in hashParams) {
        PDFJS.disableHistory = (hashParams['disablehistory'] === 'true');
      }
      if ('webgl' in hashParams) {
        PDFJS.disableWebGL = (hashParams['webgl'] !== 'true');
      }
      if ('useonlycsszoom' in hashParams) {
        PDFJS.useOnlyCssZoom = (hashParams['useonlycsszoom'] === 'true');
      }
      if ('verbosity' in hashParams) {
        PDFJS.verbosity = hashParams['verbosity'] | 0;
      }
      if ('ignorecurrentpositiononzoom' in hashParams) {
        PDFJS.ignoreCurrentPositionOnZoom =
          (hashParams['ignorecurrentpositiononzoom'] === 'true');
      }
      if (typeof PDFJSDev === 'undefined' || !PDFJSDev.test('PRODUCTION')) {
        if ('disablebcmaps' in hashParams && hashParams['disablebcmaps']) {
          PDFJS.cMapUrl = '../external/cmaps/';
          PDFJS.cMapPacked = false;
        }
      }
      if (typeof PDFJSDev === 'undefined' ||
          !PDFJSDev.test('FIREFOX || MOZCENTRAL')) {
        if ('locale' in hashParams) {
          PDFJS.locale = hashParams['locale'];
        }
      }
      if ('textlayer' in hashParams) {
        switch (hashParams['textlayer']) {
          case 'off':
            PDFJS.disableTextLayer = true;
            break;
          case 'visible':
          case 'shadow':
          case 'hover':
            var viewer = appConfig.viewerContainer;
            viewer.classList.add('textLayer-' + hashParams['textlayer']);
            break;
        }
      }
      if ('pdfbug' in hashParams) {
        PDFJS.pdfBug = true;
        var pdfBug = hashParams['pdfbug'];
        var enabled = pdfBug.split(',');
        waitForBeforeOpening.push(loadAndEnablePDFBug(enabled));
      }
    }
  
    if (typeof PDFJSDev === 'undefined' ||
        !PDFJSDev.test('FIREFOX || MOZCENTRAL')) {
      mozL10n.setLanguage(PDFJS.locale);
    } else {
      if (!PDFViewerApplication.supportsDocumentFonts) {
        PDFJS.disableFontFace = true;
        console.warn(mozL10n.get('web_fonts_disabled', null,
          'Web fonts are disabled: unable to use embedded PDF fonts.'));
      }
    }
  
    if (!PDFViewerApplication.supportsPrinting) {
      appConfig.toolbar.print.classList.add('hidden');
      appConfig.secondaryToolbar.printButton.classList.add('hidden');
    }
  
    if (!PDFViewerApplication.supportsFullscreen) {
      appConfig.toolbar.presentationModeButton.classList.add('hidden');
      appConfig.secondaryToolbar.presentationModeButton.classList.add('hidden');
    }
  
    if (PDFViewerApplication.supportsIntegratedFind) {
      appConfig.toolbar.viewFind.classList.add('hidden');
    }
  
    appConfig.sidebar.mainContainer.addEventListener('transitionend',
      function(e) {
        if (e.target === /* mainContainer */ this) {
          PDFViewerApplication.eventBus.dispatch('resize');
        }
      }, true);
  
    appConfig.sidebar.toggleButton.addEventListener('click', function() {
      PDFViewerApplication.pdfSidebar.toggle();
    });
  
    Promise.all(waitForBeforeOpening).then(function () {
      webViewerOpenFileViaURL(file);
    }).catch(function (reason) {
      PDFViewerApplication.error(mozL10n.get('loading_error', null,
        'An error occurred while opening.'), reason);
    });
  }
  
  var webViewerOpenFileViaURL;
  if (typeof PDFJSDev === 'undefined' || PDFJSDev.test('GENERIC')) {
    webViewerOpenFileViaURL = function webViewerOpenFileViaURL(file) {
      if (file && file.lastIndexOf('file:', 0) === 0) {
        // file:-scheme. Load the contents in the main thread because QtWebKit
        // cannot load file:-URLs in a Web Worker. file:-URLs are usually loaded
        // very quickly, so there is no need to set up progress event listeners.
        PDFViewerApplication.setTitleUsingUrl(file);
        var xhr = new XMLHttpRequest();
        xhr.onload = function() {
          PDFViewerApplication.open(new Uint8Array(xhr.response));
        };
        try {
          xhr.open('GET', file);
          xhr.responseType = 'arraybuffer';
          xhr.send();
        } catch (e) {
          PDFViewerApplication.error(mozL10n.get('loading_error', null,
            'An error occurred while loading the PDF.'), e);
        }
        return;
      }
  
      if (file) {
        PDFViewerApplication.open(file);
      }
    };
  } else if (PDFJSDev.test('FIREFOX || MOZCENTRAL || CHROME')) {
    webViewerOpenFileViaURL = function webViewerOpenFileViaURL(file) {
      PDFViewerApplication.setTitleUsingUrl(file);
      PDFViewerApplication.initPassiveLoading();
    };
  } else {
    webViewerOpenFileViaURL = function webViewerOpenFileURL(file) {
      if (file) {
        throw new Error('Not implemented: webViewerOpenFileURL');
      }
    };
  }
  
  function webViewerPageRendered(e) {
    var pageNumber = e.pageNumber;
    var pageIndex = pageNumber - 1;
    var pageView = PDFViewerApplication.pdfViewer.getPageView(pageIndex);
  
    // If the page is still visible when it has finished rendering,
    // ensure that the page number input loading indicator is hidden.
    if (pageNumber === PDFViewerApplication.page) {
      PDFViewerApplication.toolbar.updateLoadingIndicatorState(false);
    }
  
    // Prevent errors in the edge-case where the PDF document is removed *before*
    // the 'pagerendered' event handler is invoked.
    if (!pageView) {
      return;
    }
  
    // Use the rendered page to set the corresponding thumbnail image.
    if (PDFViewerApplication.pdfSidebar.isThumbnailViewVisible) {
      var thumbnailView = PDFViewerApplication.pdfThumbnailViewer.
                          getThumbnail(pageIndex);
      thumbnailView.setImage(pageView);
    }
  
    if (pdfjsLib.PDFJS.pdfBug && Stats.enabled && pageView.stats) {
      Stats.add(pageNumber, pageView.stats);
    }
  
    if (pageView.error) {
      PDFViewerApplication.error(mozL10n.get('rendering_error', null,
        'An error occurred while rendering the page.'), pageView.error);
    }
  
    if (typeof PDFJSDev !== 'undefined' &&
        PDFJSDev.test('FIREFOX || MOZCENTRAL')) {
      PDFViewerApplication.externalServices.reportTelemetry({
        type: 'pageInfo'
      });
      // It is a good time to report stream and font types.
      PDFViewerApplication.pdfDocument.getStats().then(function (stats) {
        PDFViewerApplication.externalServices.reportTelemetry({
          type: 'documentStats',
          stats: stats
        });
      });
    }
  }
  
  function webViewerTextLayerRendered(e) {
    if (typeof PDFJSDev !== 'undefined' &&
        PDFJSDev.test('FIREFOX || MOZCENTRAL') &&
        e.numTextDivs > 0 && !PDFViewerApplication.supportsDocumentColors) {
      console.error(mozL10n.get('document_colors_not_allowed', null,
        'PDF documents are not allowed to use their own colors: ' +
        '\'Allow pages to choose their own colors\' ' +
        'is deactivated in the browser.'));
      PDFViewerApplication.fallback();
    }
  }
  
  function webViewerPageMode(e) {
    // Handle the 'pagemode' hash parameter, see also `PDFLinkService_setHash`.
    var mode = e.mode, view;
    switch (mode) {
      case 'thumbs':
        view = SidebarView.THUMBS;
        break;
      case 'bookmarks':
      case 'outline':
        view = SidebarView.OUTLINE;
        break;
      case 'attachments':
        view = SidebarView.ATTACHMENTS;
        break;
      case 'none':
        view = SidebarView.NONE;
        break;
      default:
        console.error('Invalid "pagemode" hash parameter: ' + mode);
        return;
    }
    PDFViewerApplication.pdfSidebar.switchView(view, /* forceOpen = */ true);
  }
  
  function webViewerNamedAction(e) {
    // Processing couple of named actions that might be useful.
    // See also PDFLinkService.executeNamedAction
    var action = e.action;
    switch (action) {
      case 'GoToPage':
        PDFViewerApplication.appConfig.toolbar.pageNumber.select();
        break;
  
      case 'Find':
        if (!PDFViewerApplication.supportsIntegratedFind) {
          PDFViewerApplication.findBar.toggle();
        }
        break;
    }
  }
  
  function webViewerPresentationModeChanged(e) {
    var active = e.active;
    var switchInProgress = e.switchInProgress;
    PDFViewerApplication.pdfViewer.presentationModeState =
      switchInProgress ? PresentationModeState.CHANGING :
      active ? PresentationModeState.FULLSCREEN : PresentationModeState.NORMAL;
  }
  
  function webViewerSidebarViewChanged(e) {
    PDFViewerApplication.pdfRenderingQueue.isThumbnailViewEnabled =
      PDFViewerApplication.pdfSidebar.isThumbnailViewVisible;
  
    var store = PDFViewerApplication.store;
    if (!store || !PDFViewerApplication.isInitialViewSet) {
      // Only update the storage when the document has been loaded *and* rendered.
      return;
    }
    store.initializedPromise.then(function() {
      store.set('sidebarView', e.view).catch(function() {});
    });
  }
  
  function webViewerUpdateViewarea(e) {
    var location = e.location, store = PDFViewerApplication.store;
  
    if (store) {
      store.initializedPromise.then(function() {
        store.setMultiple({
          'exists': true,
          'page': location.pageNumber,
          'zoom': location.scale,
          'scrollLeft': location.left,
          'scrollTop': location.top,
        }).catch(function() { /* unable to write to storage */ });
      });
    }
    var href =
      PDFViewerApplication.pdfLinkService.getAnchorUrl(location.pdfOpenParams);
    PDFViewerApplication.appConfig.toolbar.viewBookmark.href = href;
    PDFViewerApplication.appConfig.secondaryToolbar.viewBookmarkButton.href =
      href;
  
    // Update the current bookmark in the browsing history.
    PDFViewerApplication.pdfHistory.updateCurrentBookmark(location.pdfOpenParams,
                                                          location.pageNumber);
  
    // Show/hide the loading indicator in the page number input element.
    var currentPage =
      PDFViewerApplication.pdfViewer.getPageView(PDFViewerApplication.page - 1);
    var loading = currentPage.renderingState !== RenderingStates.FINISHED;
    PDFViewerApplication.toolbar.updateLoadingIndicatorState(loading);
  }
  
  function webViewerResize() {
    var currentScaleValue = PDFViewerApplication.pdfViewer.currentScaleValue;
    if (currentScaleValue === 'auto' ||
        currentScaleValue === 'page-fit' ||
        currentScaleValue === 'page-width') {
      // Note: the scale is constant for 'page-actual'.
      PDFViewerApplication.pdfViewer.currentScaleValue = currentScaleValue;
    } else if (!currentScaleValue) {
      // Normally this shouldn't happen, but if the scale wasn't initialized
      // we set it to the default value in order to prevent any issues.
      // (E.g. the document being rendered with the wrong scale on load.)
      PDFViewerApplication.pdfViewer.currentScaleValue = DEFAULT_SCALE_VALUE;
    }
    PDFViewerApplication.pdfViewer.update();
  }
  
  function webViewerHashchange(e) {
    if (PDFViewerApplication.pdfHistory.isHashChangeUnlocked) {
      var hash = e.hash;
      if (!hash) {
        return;
      }
      if (!PDFViewerApplication.isInitialViewSet) {
        PDFViewerApplication.initialBookmark = hash;
      } else {
        PDFViewerApplication.pdfLinkService.setHash(hash);
      }
    }
  }
  
  var webViewerFileInputChange;
  if (typeof PDFJSDev === 'undefined' || PDFJSDev.test('GENERIC')) {
    webViewerFileInputChange = function webViewerFileInputChange(e) {
      var file = e.fileInput.files[0];
  
      if (!pdfjsLib.PDFJS.disableCreateObjectURL &&
          typeof URL !== 'undefined' && URL.createObjectURL) {
        PDFViewerApplication.open(URL.createObjectURL(file));
      } else {
        // Read the local file into a Uint8Array.
        var fileReader = new FileReader();
        fileReader.onload = function webViewerChangeFileReaderOnload(evt) {
          var buffer = evt.target.result;
          var uint8Array = new Uint8Array(buffer);
          PDFViewerApplication.open(uint8Array);
        };
        fileReader.readAsArrayBuffer(file);
      }
  
      PDFViewerApplication.setTitleUsingUrl(file.name);
  
      // URL does not reflect proper document location - hiding some icons.
      var appConfig = PDFViewerApplication.appConfig;
      appConfig.toolbar.viewBookmark.setAttribute('hidden', 'true');
      appConfig.secondaryToolbar.viewBookmarkButton.setAttribute('hidden',
                                                                 'true');
      appConfig.toolbar.download.setAttribute('hidden', 'true');
      appConfig.secondaryToolbar.downloadButton.setAttribute('hidden', 'true');
    };
  }
  
  function webViewerPresentationMode() {
    PDFViewerApplication.requestPresentationMode();
  }
  function webViewerOpenFile() {
    var openFileInputName = PDFViewerApplication.appConfig.openFileInputName;
    document.getElementById(openFileInputName).click();
  }
  function webViewerPrint() {
    window.print();
  }
  function webViewerDownload() {
    PDFViewerApplication.download();
  }
  function webViewerFirstPage() {
    if (PDFViewerApplication.pdfDocument) {
      PDFViewerApplication.page = 1;
    }
  }
  function webViewerLastPage() {
    if (PDFViewerApplication.pdfDocument) {
      PDFViewerApplication.page = PDFViewerApplication.pagesCount;
    }
  }
  function webViewerNextPage() {
    PDFViewerApplication.page++;
  }
  function webViewerPreviousPage() {
    PDFViewerApplication.page--;
  }
  function webViewerZoomIn() {
    PDFViewerApplication.zoomIn();
  }
  function webViewerZoomOut() {
    PDFViewerApplication.zoomOut();
  }
  function webViewerPageNumberChanged(e) {
    var pdfViewer = PDFViewerApplication.pdfViewer;
    pdfViewer.currentPageLabel = e.value;
  
    // Ensure that the page number input displays the correct value, even if the
    // value entered by the user was invalid (e.g. a floating point number).
    if (e.value !== pdfViewer.currentPageNumber.toString() &&
        e.value !== pdfViewer.currentPageLabel) {
      PDFViewerApplication.toolbar.setPageNumber(
        pdfViewer.currentPageNumber, pdfViewer.currentPageLabel);
    }
  }
  function webViewerScaleChanged(e) {
    PDFViewerApplication.pdfViewer.currentScaleValue = e.value;
  }
  function webViewerRotateCw() {
    PDFViewerApplication.rotatePages(90);
  }
  function webViewerRotateCcw() {
    PDFViewerApplication.rotatePages(-90);
  }
  function webViewerDocumentProperties() {
    PDFViewerApplication.pdfDocumentProperties.open();
  }
  
  function webViewerFind(e) {
    PDFViewerApplication.findController.executeCommand('find' + e.type, {
      query: e.query,
      phraseSearch: e.phraseSearch,
      caseSensitive: e.caseSensitive,
      highlightAll: e.highlightAll,
      findPrevious: e.findPrevious
    });
  }
  
  function webViewerFindFromUrlHash(e) {
    PDFViewerApplication.findController.executeCommand('find', {
      query: e.query,
      phraseSearch: e.phraseSearch,
      caseSensitive: false,
      highlightAll: true,
      findPrevious: false
    });
  }
  
  function webViewerScaleChanging(e) {
    PDFViewerApplication.toolbar.setPageScale(e.presetValue, e.scale);
  
    PDFViewerApplication.pdfViewer.update();
  }
  
  function webViewerPageChanging(e) {
    var page = e.pageNumber;
  
    PDFViewerApplication.toolbar.setPageNumber(page, e.pageLabel || null);
    PDFViewerApplication.secondaryToolbar.setPageNumber(page);
  
    if (PDFViewerApplication.pdfSidebar.isThumbnailViewVisible) {
      PDFViewerApplication.pdfThumbnailViewer.scrollThumbnailIntoView(page);
    }
  
    // we need to update stats
    if (pdfjsLib.PDFJS.pdfBug && Stats.enabled) {
      var pageView = PDFViewerApplication.pdfViewer.getPageView(page - 1);
      if (pageView.stats) {
        Stats.add(page, pageView.stats);
      }
    }
  }
  
  var zoomDisabled = false, zoomDisabledTimeout;
  function webViewerWheel(evt) {
    var pdfViewer = PDFViewerApplication.pdfViewer;
    if (pdfViewer.isInPresentationMode) {
      return;
    }
  
    if (evt.ctrlKey || evt.metaKey) {
      var support = PDFViewerApplication.supportedMouseWheelZoomModifierKeys;
      if ((evt.ctrlKey && !support.ctrlKey) ||
          (evt.metaKey && !support.metaKey)) {
        return;
      }
      // Only zoom the pages, not the entire viewer.
      evt.preventDefault();
      // NOTE: this check must be placed *after* preventDefault.
      if (zoomDisabled) {
        return;
      }
  
      var previousScale = pdfViewer.currentScale;
  
      var delta = normalizeWheelEventDelta(evt);
  
      var MOUSE_WHEEL_DELTA_PER_PAGE_SCALE = 3.0;
      var ticks = delta * MOUSE_WHEEL_DELTA_PER_PAGE_SCALE;
      if (ticks < 0) {
        PDFViewerApplication.zoomOut(-ticks);
      } else {
        PDFViewerApplication.zoomIn(ticks);
      }
  
      var currentScale = pdfViewer.currentScale;
      if (previousScale !== currentScale) {
        // After scaling the page via zoomIn/zoomOut, the position of the upper-
        // left corner is restored. When the mouse wheel is used, the position
        // under the cursor should be restored instead.
        var scaleCorrectionFactor = currentScale / previousScale - 1;
        var rect = pdfViewer.container.getBoundingClientRect();
        var dx = evt.clientX - rect.left;
        var dy = evt.clientY - rect.top;
        pdfViewer.container.scrollLeft += dx * scaleCorrectionFactor;
        pdfViewer.container.scrollTop += dy * scaleCorrectionFactor;
      }
    } else {
      zoomDisabled = true;
      clearTimeout(zoomDisabledTimeout);
      zoomDisabledTimeout = setTimeout(function () {
        zoomDisabled = false;
      }, 1000);
    }
  }
  
  function webViewerClick(evt) {
    if (!PDFViewerApplication.secondaryToolbar.isOpen) {
      return;
    }
    var appConfig = PDFViewerApplication.appConfig;
    if (PDFViewerApplication.pdfViewer.containsElement(evt.target) ||
        (appConfig.toolbar.container.contains(evt.target) &&
         evt.target !== appConfig.secondaryToolbar.toggleButton)) {
      PDFViewerApplication.secondaryToolbar.close();
    }
  }
  
  function webViewerKeyDown(evt) {
    if (OverlayManager.active) {
      return;
    }
  
    var handled = false, ensureViewerFocused = false;
    var cmd = (evt.ctrlKey ? 1 : 0) |
              (evt.altKey ? 2 : 0) |
              (evt.shiftKey ? 4 : 0) |
              (evt.metaKey ? 8 : 0);
  
    var pdfViewer = PDFViewerApplication.pdfViewer;
    var isViewerInPresentationMode = pdfViewer && pdfViewer.isInPresentationMode;
  
    // First, handle the key bindings that are independent whether an input
    // control is selected or not.
    if (cmd === 1 || cmd === 8 || cmd === 5 || cmd === 12) {
      // either CTRL or META key with optional SHIFT.
      switch (evt.keyCode) {
        case 70: // f
          if (!PDFViewerApplication.supportsIntegratedFind) {
            PDFViewerApplication.findBar.open();
            handled = true;
          }
          break;
        case 71: // g
          if (!PDFViewerApplication.supportsIntegratedFind) {
            var findState = PDFViewerApplication.findController.state;
            if (findState) {
              PDFViewerApplication.findController.executeCommand('findagain', {
                query: findState.query,
                phraseSearch: findState.phraseSearch,
                caseSensitive: findState.caseSensitive,
                highlightAll: findState.highlightAll,
                findPrevious: cmd === 5 || cmd === 12
              });
            }
            handled = true;
          }
          break;
        case 61: // FF/Mac '='
        case 107: // FF '+' and '='
        case 187: // Chrome '+'
        case 171: // FF with German keyboard
          if (!isViewerInPresentationMode) {
            PDFViewerApplication.zoomIn();
          }
          handled = true;
          break;
        case 173: // FF/Mac '-'
        case 109: // FF '-'
        case 189: // Chrome '-'
          if (!isViewerInPresentationMode) {
            PDFViewerApplication.zoomOut();
          }
          handled = true;
          break;
        case 48: // '0'
        case 96: // '0' on Numpad of Swedish keyboard
          if (!isViewerInPresentationMode) {
            // keeping it unhandled (to restore page zoom to 100%)
            setTimeout(function () {
              // ... and resetting the scale after browser adjusts its scale
              pdfViewer.currentScaleValue = DEFAULT_SCALE_VALUE;
            });
            handled = false;
          }
          break;
  
        case 38: // up arrow
          if (isViewerInPresentationMode || PDFViewerApplication.page > 1) {
            PDFViewerApplication.page = 1;
            handled = true;
            ensureViewerFocused = true;
          }
          break;
        case 40: // down arrow
          if (isViewerInPresentationMode ||
              PDFViewerApplication.page < PDFViewerApplication.pagesCount) {
            PDFViewerApplication.page = PDFViewerApplication.pagesCount;
            handled = true;
            ensureViewerFocused = true;
          }
          break;
      }
    }
  
    if (typeof PDFJSDev === 'undefined' ||
        !PDFJSDev.test('FIREFOX || MOZCENTRAL')) {
      // CTRL or META without shift
      if (cmd === 1 || cmd === 8) {
        switch (evt.keyCode) {
          case 83: // s
            PDFViewerApplication.download();
            handled = true;
            break;
        }
      }
    }
  
    // CTRL+ALT or Option+Command
    if (cmd === 3 || cmd === 10) {
      switch (evt.keyCode) {
        case 80: // p
          PDFViewerApplication.requestPresentationMode();
          handled = true;
          break;
        case 71: // g
          // focuses input#pageNumber field
          PDFViewerApplication.appConfig.toolbar.pageNumber.select();
          handled = true;
          break;
      }
    }
  
    if (handled) {
      if (ensureViewerFocused && !isViewerInPresentationMode) {
        pdfViewer.focus();
      }
      evt.preventDefault();
      return;
    }
  
    // Some shortcuts should not get handled if a control/input element
    // is selected.
    var curElement = document.activeElement || document.querySelector(':focus');
    var curElementTagName = curElement && curElement.tagName.toUpperCase();
    if (curElementTagName === 'INPUT' ||
        curElementTagName === 'TEXTAREA' ||
        curElementTagName === 'SELECT') {
      // Make sure that the secondary toolbar is closed when Escape is pressed.
      if (evt.keyCode !== 27) { // 'Esc'
        return;
      }
    }
  
    if (cmd === 0) { // no control key pressed at all.
      switch (evt.keyCode) {
        case 38: // up arrow
        case 33: // pg up
        case 8: // backspace
          if (!isViewerInPresentationMode &&
              pdfViewer.currentScaleValue !== 'page-fit') {
            break;
          }
          /* in presentation mode */
          /* falls through */
        case 37: // left arrow
          // horizontal scrolling using arrow keys
          if (pdfViewer.isHorizontalScrollbarEnabled) {
            break;
          }
          /* falls through */
        case 75: // 'k'
        case 80: // 'p'
          if (PDFViewerApplication.page > 1) {
            PDFViewerApplication.page--;
          }
          handled = true;
          break;
        case 27: // esc key
          if (PDFViewerApplication.secondaryToolbar.isOpen) {
            PDFViewerApplication.secondaryToolbar.close();
            handled = true;
          }
          if (!PDFViewerApplication.supportsIntegratedFind &&
              PDFViewerApplication.findBar.opened) {
            PDFViewerApplication.findBar.close();
            handled = true;
          }
          break;
        case 40: // down arrow
        case 34: // pg down
        case 32: // spacebar
          if (!isViewerInPresentationMode &&
              pdfViewer.currentScaleValue !== 'page-fit') {
            break;
          }
          /* falls through */
        case 39: // right arrow
          // horizontal scrolling using arrow keys
          if (pdfViewer.isHorizontalScrollbarEnabled) {
            break;
          }
          /* falls through */
        case 74: // 'j'
        case 78: // 'n'
          if (PDFViewerApplication.page < PDFViewerApplication.pagesCount) {
            PDFViewerApplication.page++;
          }
          handled = true;
          break;
  
        case 36: // home
          if (isViewerInPresentationMode || PDFViewerApplication.page > 1) {
            PDFViewerApplication.page = 1;
            handled = true;
            ensureViewerFocused = true;
          }
          break;
        case 35: // end
          if (isViewerInPresentationMode ||
              PDFViewerApplication.page < PDFViewerApplication.pagesCount) {
            PDFViewerApplication.page = PDFViewerApplication.pagesCount;
            handled = true;
            ensureViewerFocused = true;
          }
          break;
  
        case 72: // 'h'
          if (!isViewerInPresentationMode) {
            PDFViewerApplication.handTool.toggle();
          }
          break;
        case 82: // 'r'
          PDFViewerApplication.rotatePages(90);
          break;
      }
    }
  
    if (cmd === 4) { // shift-key
      switch (evt.keyCode) {
        case 32: // spacebar
          if (!isViewerInPresentationMode &&
              pdfViewer.currentScaleValue !== 'page-fit') {
            break;
          }
          if (PDFViewerApplication.page > 1) {
            PDFViewerApplication.page--;
          }
          handled = true;
          break;
  
        case 82: // 'r'
          PDFViewerApplication.rotatePages(-90);
          break;
      }
    }
  
    if (!handled && !isViewerInPresentationMode) {
      // 33=Page Up  34=Page Down  35=End    36=Home
      // 37=Left     38=Up         39=Right  40=Down
      // 32=Spacebar
      if ((evt.keyCode >= 33 && evt.keyCode <= 40) ||
          (evt.keyCode === 32 && curElementTagName !== 'BUTTON')) {
        ensureViewerFocused = true;
      }
    }
  
    if (cmd === 2) { // alt-key
      switch (evt.keyCode) {
        case 37: // left arrow
          if (isViewerInPresentationMode) {
            PDFViewerApplication.pdfHistory.back();
            handled = true;
          }
          break;
        case 39: // right arrow
          if (isViewerInPresentationMode) {
            PDFViewerApplication.pdfHistory.forward();
            handled = true;
          }
          break;
      }
    }
  
    if (ensureViewerFocused && !pdfViewer.containsElement(curElement)) {
      // The page container is not focused, but a page navigation key has been
      // pressed. Change the focus to the viewer container to make sure that
      // navigation by keyboard works as expected.
      pdfViewer.focus();
    }
  
    if (handled) {
      evt.preventDefault();
    }
  }
  
  localized.then(function webViewerLocalized() {
    document.getElementsByTagName('html')[0].dir = mozL10n.getDirection();
  });
  
  /* Abstract factory for the print service. */
  var PDFPrintServiceFactory = {
    instance: {
      supportsPrinting: false,
      createPrintService: function () {
        throw new Error('Not implemented: createPrintService');
      }
    }
  };
  
  exports.PDFViewerApplication = PDFViewerApplication;
  exports.DefaultExernalServices = DefaultExernalServices;
  exports.PDFPrintServiceFactory = PDFPrintServiceFactory;
  }));
  