/data/ext/viewerPDF/pdfjs/web/viewer.js

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/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
/* 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 PDFJS, PDFBug, FirefoxCom, Stats, Cache, PDFFindBar, CustomStyle,
           PDFFindController, ProgressBar, TextLayerBuilder, DownloadManager,
           getFileName, scrollIntoView, getPDFFileNameFromURL, PDFHistory,
           Preferences, ViewHistory, PageView, ThumbnailView, URL,
           noContextMenuHandler, SecondaryToolbar, PasswordPrompt,
           PresentationMode, HandTool, Promise, DocumentProperties */

'use strict';

//var DEFAULT_URL = 'compressed.tracemonkey-pldi-09.pdf';
var DEFAULT_SCALE = 'auto';
var DEFAULT_SCALE_DELTA = 1.1;
var UNKNOWN_SCALE = 0;
var CACHE_SIZE = 20;
var CSS_UNITS = 96.0 / 72.0;
var SCROLLBAR_PADDING = 40;
var VERTICAL_PADDING = 5;
var MAX_AUTO_SCALE = 1.25;
var MIN_SCALE = 0.25;
var MAX_SCALE = 4.0;
var VIEW_HISTORY_MEMORY = 20;
var SCALE_SELECT_CONTAINER_PADDING = 8;
var SCALE_SELECT_PADDING = 22;
var THUMBNAIL_SCROLL_MARGIN = -19;
var USE_ONLY_CSS_ZOOM = false;
var CLEANUP_TIMEOUT = 30000;
var IGNORE_CURRENT_POSITION_ON_ZOOM = false;
var RenderingStates = {
  INITIAL: 0,
  RUNNING: 1,
  PAUSED: 2,
  FINISHED: 3
};
var FindStates = {
  FIND_FOUND: 0,
  FIND_NOTFOUND: 1,
  FIND_WRAPPED: 2,
  FIND_PENDING: 3
};

PDFJS.imageResourcesPath = './images/';
  PDFJS.workerSrc = '../build/pdf.worker.js';

var mozL10n = document.mozL10n || document.webL10n;


// optimised CSS custom property getter/setter
var CustomStyle = (function CustomStyleClosure() {

  // As noted on: http://www.zachstronaut.com/posts/2009/02/17/
  //              animate-css-transforms-firefox-webkit.html
  // in some versions of IE9 it is critical that ms appear in this list
  // before Moz
  var prefixes = ['ms', 'Moz', 'Webkit', 'O'];
  var _cache = { };

  function CustomStyle() {
  }

  CustomStyle.getProp = function get(propName, element) {
    // check cache only when no element is given
    if (arguments.length == 1 && typeof _cache[propName] == 'string') {
      return _cache[propName];
    }

    element = element || document.documentElement;
    var style = element.style, prefixed, uPropName;

    // test standard property first
    if (typeof style[propName] == 'string') {
      return (_cache[propName] = propName);
    }

    // capitalize
    uPropName = propName.charAt(0).toUpperCase() + propName.slice(1);

    // test vendor specific properties
    for (var i = 0, l = prefixes.length; i < l; i++) {
      prefixed = prefixes[i] + uPropName;
      if (typeof style[prefixed] == 'string') {
        return (_cache[propName] = prefixed);
      }
    }

    //if all fails then set to undefined
    return (_cache[propName] = 'undefined');
  };

  CustomStyle.setProp = function set(propName, element, str) {
    var prop = this.getProp(propName);
    if (prop != 'undefined')
      element.style[prop] = str;
  };

  return CustomStyle;
})();

function getFileName(url) {
  var anchor = url.indexOf('#');
  var query = url.indexOf('?');
  var end = Math.min(
    anchor > 0 ? anchor : url.length,
    query > 0 ? query : url.length);
  return url.substring(url.lastIndexOf('/', end) + 1, end);
}

/**
 * Returns scale factor for the canvas. It makes sense for the HiDPI displays.
 * @return {Object} The object with horizontal (sx) and vertical (sy)
                    scales. The scaled property is set to false if scaling is
                    not required, true otherwise.
 */
function getOutputScale(ctx) {
  var devicePixelRatio = window.devicePixelRatio || 1;
  var backingStoreRatio = ctx.webkitBackingStorePixelRatio ||
                          ctx.mozBackingStorePixelRatio ||
                          ctx.msBackingStorePixelRatio ||
                          ctx.oBackingStorePixelRatio ||
                          ctx.backingStorePixelRatio || 1;
  var pixelRatio = devicePixelRatio / backingStoreRatio;
  return {
    sx: pixelRatio,
    sy: pixelRatio,
    scaled: pixelRatio != 1
  };
}

/**
 * Scrolls specified element into view of its parent.
 * element {Object} The element to be visible.
 * spot {Object} An object with optional top and left properties,
 *               specifying the offset from the top left edge.
 */
function scrollIntoView(element, spot) {
  // Assuming offsetParent is available (it's not available when viewer is in
  // hidden iframe or object). We have to scroll: if the offsetParent is not set
  // producing the error. See also animationStartedClosure.
  var parent = element.offsetParent;
  var offsetY = element.offsetTop + element.clientTop;
  var offsetX = element.offsetLeft + element.clientLeft;
  if (!parent) {
    console.error('offsetParent is not set -- cannot scroll');
    return;
  }
  while (parent.clientHeight === parent.scrollHeight) {
    if (parent.dataset._scaleY) {
      offsetY /= parent.dataset._scaleY;
      offsetX /= parent.dataset._scaleX;
    }
    offsetY += parent.offsetTop;
    offsetX += parent.offsetLeft;
    parent = parent.offsetParent;
    if (!parent) {
      return; // no need to scroll
    }
  }
  if (spot) {
    if (spot.top !== undefined) {
      offsetY += spot.top;
    }
    if (spot.left !== undefined) {
      offsetX += spot.left;
      parent.scrollLeft = offsetX;
    }
  }
  parent.scrollTop = offsetY;
}

/**
 * Event handler to suppress context menu.
 */
function noContextMenuHandler(e) {
  e.preventDefault();
}

/**
 * Returns the filename or guessed filename from the url (see issue 3455).
 * url {String} The original PDF location.
 * @return {String} Guessed PDF file name.
 */
function getPDFFileNameFromURL(url) {
  var reURI = /^(?:([^:]+:)?\/\/[^\/]+)?([^?#]*)(\?[^#]*)?(#.*)?$/;
  //            SCHEME      HOST         1.PATH  2.QUERY   3.REF
  // Pattern to get last matching NAME.pdf
  var reFilename = /[^\/?#=]+\.pdf\b(?!.*\.pdf\b)/i;
  var splitURI = reURI.exec(url);
  var suggestedFilename = reFilename.exec(splitURI[1]) ||
                           reFilename.exec(splitURI[2]) ||
                           reFilename.exec(splitURI[3]);
  if (suggestedFilename) {
    suggestedFilename = suggestedFilename[0];
    if (suggestedFilename.indexOf('%') != -1) {
      // URL-encoded %2Fpath%2Fto%2Ffile.pdf should be file.pdf
      try {
        suggestedFilename =
          reFilename.exec(decodeURIComponent(suggestedFilename))[0];
      } catch(e) { // Possible (extremely rare) errors:
        // URIError "Malformed URI", e.g. for "%AA.pdf"
        // TypeError "null has no properties", e.g. for "%2F.pdf"
      }
    }
  }
  return suggestedFilename || 'document.pdf';
}

var ProgressBar = (function ProgressBarClosure() {

  function clamp(v, min, max) {
    return Math.min(Math.max(v, min), max);
  }

  function ProgressBar(id, opts) {

    // Fetch the sub-elements for later.
    this.div = document.querySelector(id + ' .progress');

    // Get the loading bar element, so it can be resized to fit the viewer.
    this.bar = this.div.parentNode;

    // Get options, with sensible defaults.
    this.height = opts.height || 100;
    this.width = opts.width || 100;
    this.units = opts.units || '%';

    // Initialize heights.
    this.div.style.height = this.height + this.units;
    this.percent = 0;
  }

  ProgressBar.prototype = {

    updateBar: function ProgressBar_updateBar() {
      if (this._indeterminate) {
        this.div.classList.add('indeterminate');
        this.div.style.width = this.width + this.units;
        return;
      }

      this.div.classList.remove('indeterminate');
      var progressSize = this.width * this._percent / 100;
      this.div.style.width = progressSize + this.units;
    },

    get percent() {
      return this._percent;
    },

    set percent(val) {
      this._indeterminate = isNaN(val);
      this._percent = clamp(val, 0, 100);
      this.updateBar();
    },

    setWidth: function ProgressBar_setWidth(viewer) {
      if (viewer) {
        var container = viewer.parentNode;
        var scrollbarWidth = container.offsetWidth - viewer.offsetWidth;
        if (scrollbarWidth > 0) {
          this.bar.setAttribute('style', 'width: calc(100% - ' +
                                         scrollbarWidth + 'px);');
        }
      }
    },

    hide: function ProgressBar_hide() {
      this.bar.classList.add('hidden');
      this.bar.removeAttribute('style');
    }
  };

  return ProgressBar;
})();

var Cache = function cacheCache(size) {
  var data = [];
  this.push = function cachePush(view) {
    var i = data.indexOf(view);
    if (i >= 0)
      data.splice(i);
    data.push(view);
    if (data.length > size)
      data.shift().destroy();
  };
};

var isLocalStorageEnabled = (function isLocalStorageEnabledClosure() {
  // Feature test as per http://diveintohtml5.info/storage.html
  // The additional localStorage call is to get around a FF quirk, see
  // bug #495747 in bugzilla
  try {
    return ('localStorage' in window && window['localStorage'] !== null &&
            localStorage);
  } catch (e) {
    return false;
  }
})();



var EXPORTED_SYMBOLS = ['DEFAULT_PREFERENCES'];

var DEFAULT_PREFERENCES = {
  showPreviousViewOnLoad: true,
  defaultZoomValue: '',
  ifAvailableShowOutlineOnLoad: false
};


var Preferences = (function PreferencesClosure() {
  function Preferences() {
    this.prefs = {};
    this.isInitializedPromiseResolved = false;
    this.initializedPromise = this.readFromStorage().then(function(prefObj) {
      this.isInitializedPromiseResolved = true;
      if (prefObj) {
        this.prefs = prefObj;
      }
    }.bind(this));
  }

  Preferences.prototype = {
    writeToStorage: function Preferences_writeToStorage(prefObj) {
      return;
    },

    readFromStorage: function Preferences_readFromStorage() {
      var readFromStoragePromise = Promise.resolve();
      return readFromStoragePromise;
    },

    reset: function Preferences_reset() {
      if (this.isInitializedPromiseResolved) {
        this.prefs = {};
        this.writeToStorage(this.prefs);
      }
    },

    set: function Preferences_set(name, value) {
      if (!this.isInitializedPromiseResolved) {
        return;
      } else if (DEFAULT_PREFERENCES[name] === undefined) {
        console.error('Preferences_set: \'' + name + '\' is undefined.');
        return;
      } else if (value === undefined) {
        console.error('Preferences_set: no value is specified.');
        return;
      }
      var valueType = typeof value;
      var defaultType = typeof DEFAULT_PREFERENCES[name];

      if (valueType !== defaultType) {
        if (valueType === 'number' && defaultType === 'string') {
          value = value.toString();
        } else {
          console.error('Preferences_set: \'' + value + '\' is a \"' +
                        valueType + '\", expected a \"' + defaultType + '\".');
          return;
        }
      }
      this.prefs[name] = value;
      this.writeToStorage(this.prefs);
    },

    get: function Preferences_get(name) {
      var defaultPref = DEFAULT_PREFERENCES[name];

      if (defaultPref === undefined) {
        console.error('Preferences_get: \'' + name + '\' is undefined.');
        return;
      } else if (this.isInitializedPromiseResolved) {
        var pref = this.prefs[name];

        if (pref !== undefined) {
          return pref;
        }
      }
      return defaultPref;
    }
  };

  return Preferences;
})();


Preferences.prototype.writeToStorage = function(prefObj) {
  if (isLocalStorageEnabled) {
    localStorage.setItem('preferences', JSON.stringify(prefObj));
  }
};

Preferences.prototype.readFromStorage = function() {
  var readFromStoragePromise = new Promise(function (resolve) {
    if (isLocalStorageEnabled) {
      var readPrefs = JSON.parse(localStorage.getItem('preferences'));
      resolve(readPrefs);
    }
  });
  return readFromStoragePromise;
};


(function mozPrintCallbackPolyfillClosure() {
  if ('mozPrintCallback' in document.createElement('canvas')) {
    return;
  }
  // Cause positive result on feature-detection:
  HTMLCanvasElement.prototype.mozPrintCallback = undefined;

  var canvases;   // During print task: non-live NodeList of <canvas> elements
  var index;      // Index of <canvas> element that is being processed

  var print = window.print;
  window.print = function print() {
    if (canvases) {
      console.warn('Ignored window.print() because of a pending print job.');
      return;
    }
    try {
      dispatchEvent('beforeprint');
    } finally {
      canvases = document.querySelectorAll('canvas');
      index = -1;
      next();
    }
  };

  function dispatchEvent(eventType) {
    var event = document.createEvent('CustomEvent');
    event.initCustomEvent(eventType, false, false, 'custom');
    window.dispatchEvent(event);
  }

  function next() {
    if (!canvases) {
      return; // Print task cancelled by user (state reset in abort())
    }

    renderProgress();
    if (++index < canvases.length) {
      var canvas = canvases[index];
      if (typeof canvas.mozPrintCallback === 'function') {
        canvas.mozPrintCallback({
          context: canvas.getContext('2d'),
          abort: abort,
          done: next
        });
      } else {
        next();
      }
    } else {
      renderProgress();
      print.call(window);
      setTimeout(abort, 20); // Tidy-up
    }
  }

  function abort() {
    if (canvases) {
      canvases = null;
      renderProgress();
      dispatchEvent('afterprint');
    }
  }

  function renderProgress() {
    var progressContainer = document.getElementById('mozPrintCallback-shim');
    if (canvases) {
      var progress = Math.round(100 * index / canvases.length);
      var progressBar = progressContainer.querySelector('progress');
      var progressPerc = progressContainer.querySelector('.relative-progress');
      progressBar.value = progress;
      progressPerc.textContent = progress + '%';
      progressContainer.removeAttribute('hidden');
      progressContainer.onclick = abort;
    } else {
      progressContainer.setAttribute('hidden', '');
    }
  }

  var hasAttachEvent = !!document.attachEvent;

  window.addEventListener('keydown', function(event) {
    // Intercept Cmd/Ctrl + P in all browsers.
    // Also intercept Cmd/Ctrl + Shift + P in Chrome and Opera
    if (event.keyCode === 80/*P*/ && (event.ctrlKey || event.metaKey) &&
        !event.altKey && (!event.shiftKey || window.chrome || window.opera)) {
      window.print();
      if (hasAttachEvent) {
        // Only attachEvent can cancel Ctrl + P dialog in IE <=10
        // attachEvent is gone in IE11, so the dialog will re-appear in IE11.
        return;
      }
      event.preventDefault();
      if (event.stopImmediatePropagation) {
        event.stopImmediatePropagation();
      } else {
        event.stopPropagation();
      }
      return;
    }
    if (event.keyCode === 27 && canvases) { // Esc
      abort();
    }
  }, true);
  if (hasAttachEvent) {
    document.attachEvent('onkeydown', function(event) {
      event = event || window.event;
      if (event.keyCode === 80/*P*/ && event.ctrlKey) {
        event.keyCode = 0;
        return false;
      }
    });
  }

  if ('onbeforeprint' in window) {
    // Do not propagate before/afterprint events when they are not triggered
    // from within this polyfill. (FF/IE).
    var stopPropagationIfNeeded = function(event) {
      if (event.detail !== 'custom' && event.stopImmediatePropagation) {
        event.stopImmediatePropagation();
      }
    };
    window.addEventListener('beforeprint', stopPropagationIfNeeded, false);
    window.addEventListener('afterprint', stopPropagationIfNeeded, false);
  }
})();



var DownloadManager = (function DownloadManagerClosure() {

  function download(blobUrl, filename) {
    var a = document.createElement('a');
    if (a.click) {
      // Use a.click() if available. Otherwise, Chrome might show
      // "Unsafe JavaScript attempt to initiate a navigation change
      //  for frame with URL" and not open the PDF at all.
      // Supported by (not mentioned = untested):
      // - Firefox 6 - 19 (4- does not support a.click, 5 ignores a.click)
      // - Chrome 19 - 26 (18- does not support a.click)
      // - Opera 9 - 12.15
      // - Internet Explorer 6 - 10
      // - Safari 6 (5.1- does not support a.click)
      a.href = blobUrl;
      a.target = '_parent';
      // Use a.download if available. This increases the likelihood that
      // the file is downloaded instead of opened by another PDF plugin.
      if ('download' in a) {
        a.download = filename;
      }
      // <a> must be in the document for IE and recent Firefox versions.
      // (otherwise .click() is ignored)
      (document.body || document.documentElement).appendChild(a);
      a.click();
      a.parentNode.removeChild(a);
    } else {
      if (window.top === window &&
          blobUrl.split('#')[0] === window.location.href.split('#')[0]) {
        // If _parent == self, then opening an identical URL with different
        // location hash will only cause a navigation, not a download.
        var padCharacter = blobUrl.indexOf('?') === -1 ? '?' : '&';
        blobUrl = blobUrl.replace(/#|$/, padCharacter + '$&');
      }
      window.open(blobUrl, '_parent');
    }
  }

  function DownloadManager() {}

  DownloadManager.prototype = {
    downloadUrl: function DownloadManager_downloadUrl(url, filename) {
      if (!PDFJS.isValidUrl(url, true)) {
        return; // restricted/invalid URL
      }

      download(url + '#pdfjs.action=download', filename);
    },

    download: function DownloadManager_download(blob, url, filename) {
      if (!URL) {
        // URL.createObjectURL is not supported
        this.downloadUrl(url, filename);
        return;
      }

      if (navigator.msSaveBlob) {
        // IE10 / IE11
        if (!navigator.msSaveBlob(blob, filename)) {
          this.downloadUrl(url, filename);
        }
        return;
      }

      var blobUrl = URL.createObjectURL(blob);
      download(blobUrl, filename);
    }
  };

  return DownloadManager;
})();




var cache = new Cache(CACHE_SIZE);
var currentPageNumber = 1;


/**
 * View History - This is a utility for saving various view parameters for
 *                recently opened files.
 *
 * The way that the view parameters are stored depends on how PDF.js is built,
 * for 'node make <flag>' the following cases exist:
 *  - FIREFOX or MOZCENTRAL - uses about:config.
 *  - B2G                   - uses asyncStorage.
 *  - GENERIC or CHROME     - uses localStorage, if it is available.
 */
var ViewHistory = (function ViewHistoryClosure() {
  function ViewHistory(fingerprint) {
    this.fingerprint = fingerprint;
    var initializedPromiseResolve;
    this.isInitializedPromiseResolved = false;
    this.initializedPromise = new Promise(function (resolve) {
      initializedPromiseResolve = resolve;
    });

    var resolvePromise = (function ViewHistoryResolvePromise(db) {
      this.isInitializedPromiseResolved = true;
      this.initialize(db || '{}');
      initializedPromiseResolve();
    }).bind(this);



    if (isLocalStorageEnabled) {
      resolvePromise(localStorage.getItem('database'));
    }
  }

  ViewHistory.prototype = {
    initialize: function ViewHistory_initialize(database) {
      database = JSON.parse(database);
      if (!('files' in database)) {
        database.files = [];
      }
      if (database.files.length >= VIEW_HISTORY_MEMORY) {
        database.files.shift();
      }
      var index;
      for (var i = 0, length = database.files.length; i < length; i++) {
        var branch = database.files[i];
        if (branch.fingerprint === this.fingerprint) {
          index = i;
          break;
        }
      }
      if (typeof index !== 'number') {
        index = database.files.push({fingerprint: this.fingerprint}) - 1;
      }
      this.file = database.files[index];
      this.database = database;
    },

    set: function ViewHistory_set(name, val) {
      if (!this.isInitializedPromiseResolved) {
        return;
      }
      var file = this.file;
      file[name] = val;
      var database = JSON.stringify(this.database);



      if (isLocalStorageEnabled) {
        localStorage.setItem('database', database);
      }
    },

    get: function ViewHistory_get(name, defaultValue) {
      if (!this.isInitializedPromiseResolved) {
        return defaultValue;
      }
      return this.file[name] || defaultValue;
    }
  };

  return ViewHistory;
})();


/* globals PDFFindController, FindStates, mozL10n */

/**
 * Creates a "search bar" given set of DOM elements
 * that act as controls for searching, or for setting
 * search preferences in the UI. This object also sets
 * up the appropriate events for the controls. Actual
 * searching is done by PDFFindController
 */
var PDFFindBar = {

  opened: false,
  bar: null,
  toggleButton: null,
  findField: null,
  highlightAll: null,
  caseSensitive: null,
  findMsg: null,
  findStatusIcon: null,
  findPreviousButton: null,
  findNextButton: null,

  initialize: function(options) {
    if(typeof PDFFindController === 'undefined' || PDFFindController === null) {
        throw 'PDFFindBar cannot be initialized ' +
            'without a PDFFindController instance.';
    }

    this.bar = options.bar;
    this.toggleButton = options.toggleButton;
    this.findField = options.findField;
    this.highlightAll = options.highlightAllCheckbox;
    this.caseSensitive = options.caseSensitiveCheckbox;
    this.findMsg = options.findMsg;
    this.findStatusIcon = options.findStatusIcon;
    this.findPreviousButton = options.findPreviousButton;
    this.findNextButton = options.findNextButton;

    var self = this;
    this.toggleButton.addEventListener('click', function() {
      self.toggle();
    });

    this.findField.addEventListener('input', function() {
      self.dispatchEvent('');
    });

    this.bar.addEventListener('keydown', function(evt) {
      switch (evt.keyCode) {
        case 13: // Enter
          if (evt.target === self.findField) {
            self.dispatchEvent('again', evt.shiftKey);
          }
          break;
        case 27: // Escape
          self.close();
          break;
      }
    });

    this.findPreviousButton.addEventListener('click',
      function() { self.dispatchEvent('again', true); }
    );

    this.findNextButton.addEventListener('click', function() {
      self.dispatchEvent('again', false);
    });

    this.highlightAll.addEventListener('click', function() {
      self.dispatchEvent('highlightallchange');
    });

    this.caseSensitive.addEventListener('click', function() {
      self.dispatchEvent('casesensitivitychange');
    });
  },

  dispatchEvent: function(aType, aFindPrevious) {
    var event = document.createEvent('CustomEvent');
    event.initCustomEvent('find' + aType, true, true, {
      query: this.findField.value,
      caseSensitive: this.caseSensitive.checked,
      highlightAll: this.highlightAll.checked,
      findPrevious: aFindPrevious
    });
    return window.dispatchEvent(event);
  },

  updateUIState: function(state, previous) {
    var notFound = false;
    var findMsg = '';
    var status = '';

    switch (state) {
      case FindStates.FIND_FOUND:
        break;

      case FindStates.FIND_PENDING:
        status = 'pending';
        break;

      case FindStates.FIND_NOTFOUND:
        findMsg = mozL10n.get('find_not_found', null, 'Phrase not found');
        notFound = true;
        break;

      case FindStates.FIND_WRAPPED:
        if (previous) {
          findMsg = mozL10n.get('find_reached_top', null,
                      'Reached top of document, continued from bottom');
        } else {
          findMsg = mozL10n.get('find_reached_bottom', null,
                                'Reached end of document, continued from top');
        }
        break;
    }

    if (notFound) {
      this.findField.classList.add('notFound');
    } else {
      this.findField.classList.remove('notFound');
    }

    this.findField.setAttribute('data-status', status);
    this.findMsg.textContent = findMsg;
  },

  open: function() {
    if (!this.opened) {
      this.opened = true;
      this.toggleButton.classList.add('toggled');
      this.bar.classList.remove('hidden');
    }

    this.findField.select();
    this.findField.focus();
  },

  close: function() {
    if (!this.opened) return;

    this.opened = false;
    this.toggleButton.classList.remove('toggled');
    this.bar.classList.add('hidden');

    PDFFindController.active = false;
  },

  toggle: function() {
    if (this.opened) {
      this.close();
    } else {
      this.open();
    }
  }
};



/* globals PDFFindBar, PDFJS, FindStates, FirefoxCom, Promise */

/**
 * Provides a "search" or "find" functionality for the PDF.
 * This object actually performs the search for a given string.
 */

var PDFFindController = {
  startedTextExtraction: false,

  extractTextPromises: [],

  pendingFindMatches: {},

  // If active, find results will be highlighted.
  active: false,

  // Stores the text for each page.
  pageContents: [],

  pageMatches: [],

  // Currently selected match.
  selected: {
    pageIdx: -1,
    matchIdx: -1
  },

  // Where find algorithm currently is in the document.
  offset: {
    pageIdx: null,
    matchIdx: null
  },

  resumePageIdx: null,

  state: null,

  dirtyMatch: false,

  findTimeout: null,

  pdfPageSource: null,

  integratedFind: false,

  initialize: function(options) {
    if(typeof PDFFindBar === 'undefined' || PDFFindBar === null) {
      throw 'PDFFindController cannot be initialized ' +
            'without a PDFFindController instance';
    }

    this.pdfPageSource = options.pdfPageSource;
    this.integratedFind = options.integratedFind;

    var events = [
      'find',
      'findagain',
      'findhighlightallchange',
      'findcasesensitivitychange'
    ];

    this.firstPagePromise = new Promise(function (resolve) {
      this.resolveFirstPage = resolve;
    }.bind(this));
    this.handleEvent = this.handleEvent.bind(this);

    for (var i = 0; i < events.length; i++) {
      window.addEventListener(events[i], this.handleEvent);
    }
  },

  reset: function pdfFindControllerReset() {
    this.startedTextExtraction = false;
    this.extractTextPromises = [];
    this.active = false;
  },

  calcFindMatch: function(pageIndex) {
    var pageContent = this.pageContents[pageIndex];
    var query = this.state.query;
    var caseSensitive = this.state.caseSensitive;
    var queryLen = query.length;

    if (queryLen === 0) {
      // Do nothing the matches should be wiped out already.
      return;
    }

    if (!caseSensitive) {
      pageContent = pageContent.toLowerCase();
      query = query.toLowerCase();
    }

    var matches = [];

    var matchIdx = -queryLen;
    while (true) {
      matchIdx = pageContent.indexOf(query, matchIdx + queryLen);
      if (matchIdx === -1) {
        break;
      }

      matches.push(matchIdx);
    }
    this.pageMatches[pageIndex] = matches;
    this.updatePage(pageIndex);
    if (this.resumePageIdx === pageIndex) {
      this.resumePageIdx = null;
      this.nextPageMatch();
    }
  },

  extractText: function() {
    if (this.startedTextExtraction) {
      return;
    }
    this.startedTextExtraction = true;

    this.pageContents = [];
    var extractTextPromisesResolves = [];
    for (var i = 0, ii = this.pdfPageSource.pdfDocument.numPages; i < ii; i++) {
      this.extractTextPromises.push(new Promise(function (resolve) {
        extractTextPromisesResolves.push(resolve);
      }));
    }

    var self = this;
    function extractPageText(pageIndex) {
      self.pdfPageSource.pages[pageIndex].getTextContent().then(
        function textContentResolved(bidiTexts) {
          var str = '';

          for (var i = 0; i < bidiTexts.length; i++) {
            str += bidiTexts[i].str;
          }

          // Store the pageContent as a string.
          self.pageContents.push(str);

          extractTextPromisesResolves[pageIndex](pageIndex);
          if ((pageIndex + 1) < self.pdfPageSource.pages.length)
            extractPageText(pageIndex + 1);
        }
      );
    }
    extractPageText(0);
  },

  handleEvent: function(e) {
    if (this.state === null || e.type !== 'findagain') {
      this.dirtyMatch = true;
    }
    this.state = e.detail;
    this.updateUIState(FindStates.FIND_PENDING);

    this.firstPagePromise.then(function() {
      this.extractText();

      clearTimeout(this.findTimeout);
      if (e.type === 'find') {
        // Only trigger the find action after 250ms of silence.
        this.findTimeout = setTimeout(this.nextMatch.bind(this), 250);
      } else {
        this.nextMatch();
      }
    }.bind(this));
  },

  updatePage: function(idx) {
    var page = this.pdfPageSource.pages[idx];

    if (this.selected.pageIdx === idx) {
      // If the page is selected, scroll the page into view, which triggers
      // rendering the page, which adds the textLayer. Once the textLayer is
      // build, it will scroll onto the selected match.
      page.scrollIntoView();
    }

    if (page.textLayer) {
      page.textLayer.updateMatches();
    }
  },

  nextMatch: function() {
    var previous = this.state.findPrevious;
    var currentPageIndex = this.pdfPageSource.page - 1;
    var numPages = this.pdfPageSource.pages.length;

    this.active = true;

    if (this.dirtyMatch) {
      // Need to recalculate the matches, reset everything.
      this.dirtyMatch = false;
      this.selected.pageIdx = this.selected.matchIdx = -1;
      this.offset.pageIdx = currentPageIndex;
      this.offset.matchIdx = null;
      this.hadMatch = false;
      this.resumePageIdx = null;
      this.pageMatches = [];
      var self = this;

      for (var i = 0; i < numPages; i++) {
        // Wipe out any previous highlighted matches.
        this.updatePage(i);

        // As soon as the text is extracted start finding the matches.
        if (!(i in this.pendingFindMatches)) {
          this.pendingFindMatches[i] = true;
          this.extractTextPromises[i].then(function(pageIdx) {
            delete self.pendingFindMatches[pageIdx];
            self.calcFindMatch(pageIdx);
          });
        }
      }
    }

    // If there's no query there's no point in searching.
    if (this.state.query === '') {
      this.updateUIState(FindStates.FIND_FOUND);
      return;
    }

    // If we're waiting on a page, we return since we can't do anything else.
    if (this.resumePageIdx) {
      return;
    }

    var offset = this.offset;
    // If there's already a matchIdx that means we are iterating through a
    // page's matches.
    if (offset.matchIdx !== null) {
      var numPageMatches = this.pageMatches[offset.pageIdx].length;
      if ((!previous && offset.matchIdx + 1 < numPageMatches) ||
          (previous && offset.matchIdx > 0)) {
        // The simple case, we just have advance the matchIdx to select the next
        // match on the page.
        this.hadMatch = true;
        offset.matchIdx = previous ? offset.matchIdx - 1 : offset.matchIdx + 1;
        this.updateMatch(true);
        return;
      }
      // We went beyond the current page's matches, so we advance to the next
      // page.
      this.advanceOffsetPage(previous);
    }
    // Start searching through the page.
    this.nextPageMatch();
  },

  matchesReady: function(matches) {
    var offset = this.offset;
    var numMatches = matches.length;
    var previous = this.state.findPrevious;
    if (numMatches) {
      // There were matches for the page, so initialize the matchIdx.
      this.hadMatch = true;
      offset.matchIdx = previous ? numMatches - 1 : 0;
      this.updateMatch(true);
      // matches were found
      return true;
    } else {
      // No matches attempt to search the next page.
      this.advanceOffsetPage(previous);
      if (offset.wrapped) {
        offset.matchIdx = null;
        if (!this.hadMatch) {
          // No point in wrapping there were no matches.
          this.updateMatch(false);
          // while matches were not found, searching for a page 
          // with matches should nevertheless halt.
          return true;
        }
      }
      // matches were not found (and searching is not done)
      return false;
    }
  },

  nextPageMatch: function() {
    if (this.resumePageIdx !== null) {
      console.error('There can only be one pending page.');
    }
    do {
      var pageIdx = this.offset.pageIdx;
      var matches = this.pageMatches[pageIdx];
      if (!matches) {
        // The matches don't exist yet for processing by "matchesReady",
        // so set a resume point for when they do exist.
        this.resumePageIdx = pageIdx;
        break;
      }
    } while (!this.matchesReady(matches));
  },

  advanceOffsetPage: function(previous) {
    var offset = this.offset;
    var numPages = this.extractTextPromises.length;
    offset.pageIdx = previous ? offset.pageIdx - 1 : offset.pageIdx + 1;
    offset.matchIdx = null;
    if (offset.pageIdx >= numPages || offset.pageIdx < 0) {
      offset.pageIdx = previous ? numPages - 1 : 0;
      offset.wrapped = true;
      return;
    }
  },

  updateMatch: function(found) {
    var state = FindStates.FIND_NOTFOUND;
    var wrapped = this.offset.wrapped;
    this.offset.wrapped = false;
    if (found) {
      var previousPage = this.selected.pageIdx;
      this.selected.pageIdx = this.offset.pageIdx;
      this.selected.matchIdx = this.offset.matchIdx;
      state = wrapped ? FindStates.FIND_WRAPPED : FindStates.FIND_FOUND;
      // Update the currently selected page to wipe out any selected matches.
      if (previousPage !== -1 && previousPage !== this.selected.pageIdx) {
        this.updatePage(previousPage);
      }
    }
    this.updateUIState(state, this.state.findPrevious);
    if (this.selected.pageIdx !== -1) {
      this.updatePage(this.selected.pageIdx, true);
    }
  },

  updateUIState: function(state, previous) {
    if (this.integratedFind) {
      FirefoxCom.request('updateFindControlState',
                         {result: state, findPrevious: previous});
      return;
    }
    PDFFindBar.updateUIState(state, previous);
  }
};



var PDFHistory = {
  initialized: false,
  initialDestination: null,

  initialize: function pdfHistoryInitialize(fingerprint) {
    if (PDFJS.disableHistory || PDFView.isViewerEmbedded) {
      // The browsing history is only enabled when the viewer is standalone,
      // i.e. not when it is embedded in a web page.
      return;
    }
    this.initialized = true;
    this.reInitialized = false;
    this.allowHashChange = true;
    this.historyUnlocked = true;

    this.previousHash = window.location.hash.substring(1);
    this.currentBookmark = '';
    this.currentPage = 0;
    this.updatePreviousBookmark = false;
    this.previousBookmark = '';
    this.previousPage = 0;
    this.nextHashParam = '';

    this.fingerprint = fingerprint;
    this.currentUid = this.uid = 0;
    this.current = {};

    var state = window.history.state;
    if (this._isStateObjectDefined(state)) {
      // This corresponds to navigating back to the document
      // from another page in the browser history.
      if (state.target.dest) {
        this.initialDestination = state.target.dest;
      } else {
        PDFView.initialBookmark = state.target.hash;
      }
      this.currentUid = state.uid;
      this.uid = state.uid + 1;
      this.current = state.target;
    } else {
      // This corresponds to the loading of a new document.
      if (state && state.fingerprint &&
          this.fingerprint !== state.fingerprint) {
        // Reinitialize the browsing history when a new document
        // is opened in the web viewer.
        this.reInitialized = true;
      }
      this._pushOrReplaceState({ fingerprint: this.fingerprint }, true);
    }

    var self = this;
    window.addEventListener('popstate', function pdfHistoryPopstate(evt) {
      evt.preventDefault();
      evt.stopPropagation();

      if (!self.historyUnlocked) {
        return;
      }
      if (evt.state) {
        // Move back/forward in the history.
        self._goTo(evt.state);
      } else {
        // Handle the user modifying the hash of a loaded document.
        self.previousHash = window.location.hash.substring(1);

        // If the history is empty when the hash changes,
        // update the previous entry in the browser history.
        if (self.uid === 0) {
          var previousParams = (self.previousHash && self.currentBookmark &&
                                self.previousHash !== self.currentBookmark) ?
            { hash: self.currentBookmark, page: self.currentPage } :
            { page: 1 };
          self.historyUnlocked = false;
          self.allowHashChange = false;
          window.history.back();
          self._pushToHistory(previousParams, false, true);
          window.history.forward();
          self.historyUnlocked = true;
        }
        self._pushToHistory({ hash: self.previousHash }, false, true);
        self._updatePreviousBookmark();
      }
    }, false);

    function pdfHistoryBeforeUnload() {
      var previousParams = self._getPreviousParams(null, true);
      if (previousParams) {
        var replacePrevious = (!self.current.dest &&
                               self.current.hash !== self.previousHash);
        self._pushToHistory(previousParams, false, replacePrevious);
        self._updatePreviousBookmark();
      }
      // Remove the event listener when navigating away from the document,
      // since 'beforeunload' prevents Firefox from caching the document.
      window.removeEventListener('beforeunload', pdfHistoryBeforeUnload, false);
    }
    window.addEventListener('beforeunload', pdfHistoryBeforeUnload, false);

    window.addEventListener('pageshow', function pdfHistoryPageShow(evt) {
      // If the entire viewer (including the PDF file) is cached in the browser,
      // we need to reattach the 'beforeunload' event listener since
      // the 'DOMContentLoaded' event is not fired on 'pageshow'.
      window.addEventListener('beforeunload', pdfHistoryBeforeUnload, false);
    }, false);
  },

  _isStateObjectDefined: function pdfHistory_isStateObjectDefined(state) {
    return (state && state.uid >= 0 &&
            state.fingerprint && this.fingerprint === state.fingerprint &&
            state.target && state.target.hash) ? true : false;
  },

  _pushOrReplaceState: function pdfHistory_pushOrReplaceState(stateObj,
                                                              replace) {
    if (replace) {
      window.history.replaceState(stateObj, '', document.URL);
    } else {
      window.history.pushState(stateObj, '', document.URL);
    }
  },

  get isHashChangeUnlocked() {
    if (!this.initialized) {
      return true;
    }
    // If the current hash changes when moving back/forward in the history,
    // this will trigger a 'popstate' event *as well* as a 'hashchange' event.
    // Since the hash generally won't correspond to the exact the position
    // stored in the history's state object, triggering the 'hashchange' event
    // can thus corrupt the browser history.
    //
    // When the hash changes during a 'popstate' event, we *only* prevent the
    // first 'hashchange' event and immediately reset allowHashChange.
    // If it is not reset, the user would not be able to change the hash.

    var temp = this.allowHashChange;
    this.allowHashChange = true;
    return temp;
  },

  _updatePreviousBookmark: function pdfHistory_updatePreviousBookmark() {
    if (this.updatePreviousBookmark &&
        this.currentBookmark && this.currentPage) {
      this.previousBookmark = this.currentBookmark;
      this.previousPage = this.currentPage;
      this.updatePreviousBookmark = false;
    }
  },

  updateCurrentBookmark: function pdfHistoryUpdateCurrentBookmark(bookmark,
                                                                  pageNum) {
    if (this.initialized) {
      this.currentBookmark = bookmark.substring(1);
      this.currentPage = pageNum | 0;
      this._updatePreviousBookmark();
    }
  },

  updateNextHashParam: function pdfHistoryUpdateNextHashParam(param) {
    if (this.initialized) {
      this.nextHashParam = param;
    }
  },

  push: function pdfHistoryPush(params, isInitialBookmark) {
    if (!(this.initialized && this.historyUnlocked)) {
      return;
    }
    if (params.dest && !params.hash) {
      params.hash = (this.current.hash && this.current.dest &&
                     this.current.dest === params.dest) ?
        this.current.hash :
        PDFView.getDestinationHash(params.dest).split('#')[1];
    }
    if (params.page) {
      params.page |= 0;
    }
    if (isInitialBookmark) {
      var target = window.history.state.target;
      if (!target) {
        // Invoked when the user specifies an initial bookmark,
        // thus setting PDFView.initialBookmark, when the document is loaded.
        this._pushToHistory(params, false);
        this.previousHash = window.location.hash.substring(1);
      }
      this.updatePreviousBookmark = this.nextHashParam ? false : true;
      if (target) {
        // If the current document is reloaded,
        // avoid creating duplicate entries in the history.
        this._updatePreviousBookmark();
      }
      return;
    }
    if (this.nextHashParam) {
      if (this.nextHashParam === params.hash) {
        this.nextHashParam = null;
        this.updatePreviousBookmark = true;
        return;
      } else {
        this.nextHashParam = null;
      }
    }

    if (params.hash) {
      if (this.current.hash) {
        if (this.current.hash !== params.hash) {
          this._pushToHistory(params, true);
        } else {
          if (!this.current.page && params.page) {
            this._pushToHistory(params, false, true);
          }
          this.updatePreviousBookmark = true;
        }
      } else {
        this._pushToHistory(params, true);
      }
    } else if (this.current.page && params.page &&
               this.current.page !== params.page) {
      this._pushToHistory(params, true);
    }
  },

  _getPreviousParams: function pdfHistory_getPreviousParams(onlyCheckPage,
                                                            beforeUnload) {
    if (!(this.currentBookmark && this.currentPage)) {
      return null;
    } else if (this.updatePreviousBookmark) {
      this.updatePreviousBookmark = false;
    }
    if (this.uid > 0 && !(this.previousBookmark && this.previousPage)) {
      // Prevent the history from getting stuck in the current state,
      // effectively preventing the user from going back/forward in the history.
      //
      // This happens if the current position in the document didn't change when
      // the history was previously updated. The reasons for this are either:
      // 1. The current zoom value is such that the document does not need to,
      //    or cannot, be scrolled to display the destination.
      // 2. The previous destination is broken, and doesn't actally point to a
      //    position within the document.
      //    (This is either due to a bad PDF generator, or the user making a
      //     mistake when entering a destination in the hash parameters.)
      return null;
    }
    if ((!this.current.dest && !onlyCheckPage) || beforeUnload) {
      if (this.previousBookmark === this.currentBookmark) {
        return null;
      }
    } else if (this.current.page || onlyCheckPage) {
      if (this.previousPage === this.currentPage) {
        return null;
      }
    } else {
      return null;
    }
    var params = { hash: this.currentBookmark, page: this.currentPage };
    if (PresentationMode.active) {
      params.hash = null;
    }
    return params;
  },

  _stateObj: function pdfHistory_stateObj(params) {
    return { fingerprint: this.fingerprint, uid: this.uid, target: params };
  },

  _pushToHistory: function pdfHistory_pushToHistory(params,
                                                    addPrevious, overwrite) {
    if (!this.initialized) {
      return;
    }
    if (!params.hash && params.page) {
      params.hash = ('page=' + params.page);
    }
    if (addPrevious && !overwrite) {
      var previousParams = this._getPreviousParams();
      if (previousParams) {
        var replacePrevious = (!this.current.dest &&
                               this.current.hash !== this.previousHash);
        this._pushToHistory(previousParams, false, replacePrevious);
      }
    }
    this._pushOrReplaceState(this._stateObj(params),
                             (overwrite || this.uid === 0));
    this.currentUid = this.uid++;
    this.current = params;
    this.updatePreviousBookmark = true;
  },

  _goTo: function pdfHistory_goTo(state) {
    if (!(this.initialized && this.historyUnlocked &&
          this._isStateObjectDefined(state))) {
      return;
    }
    if (!this.reInitialized && state.uid < this.currentUid) {
      var previousParams = this._getPreviousParams(true);
      if (previousParams) {
        this._pushToHistory(this.current, false);
        this._pushToHistory(previousParams, false);
        this.currentUid = state.uid;
        window.history.back();
        return;
      }
    }
    this.historyUnlocked = false;

    if (state.target.dest) {
      PDFView.navigateTo(state.target.dest);
    } else {
      PDFView.setHash(state.target.hash);
    }
    this.currentUid = state.uid;
    if (state.uid > this.uid) {
      this.uid = state.uid;
    }
    this.current = state.target;
    this.updatePreviousBookmark = true;

    var currentHash = window.location.hash.substring(1);
    if (this.previousHash !== currentHash) {
      this.allowHashChange = false;
    }
    this.previousHash = currentHash;

    this.historyUnlocked = true;
  },

  back: function pdfHistoryBack() {
    this.go(-1);
  },

  forward: function pdfHistoryForward() {
    this.go(1);
  },

  go: function pdfHistoryGo(direction) {
    if (this.initialized && this.historyUnlocked) {
      var state = window.history.state;
      if (direction === -1 && state && state.uid > 0) {
        window.history.back();
      } else if (direction === 1 && state && state.uid < (this.uid - 1)) {
        window.history.forward();
      }
    }
  }
};


var SecondaryToolbar = {
  opened: false,
  previousContainerHeight: null,
  newContainerHeight: null,

  initialize: function secondaryToolbarInitialize(options) {
    this.toolbar = options.toolbar;
    this.presentationMode = options.presentationMode;
    this.documentProperties = options.documentProperties;
    this.buttonContainer = this.toolbar.firstElementChild;

    // Define the toolbar buttons.
    this.toggleButton = options.toggleButton;
    this.presentationModeButton = options.presentationModeButton;
    this.openFile = options.openFile;
    this.print = options.print;
    this.download = options.download;
    this.viewBookmark = options.viewBookmark;
    this.firstPage = options.firstPage;
    this.lastPage = options.lastPage;
    this.pageRotateCw = options.pageRotateCw;
    this.pageRotateCcw = options.pageRotateCcw;
    this.documentPropertiesButton = options.documentPropertiesButton;

    // Attach the event listeners.
    var elements = [
      // Button to toggle the visibility of the secondary toolbar:
      { element: this.toggleButton, handler: this.toggle },
      // All items within the secondary toolbar
      // (except for toggleHandTool, hand_tool.js is responsible for it):
      { element: this.presentationModeButton,
        handler: this.presentationModeClick },
      { element: this.openFile, handler: this.openFileClick },
      { element: this.print, handler: this.printClick },
      { element: this.download, handler: this.downloadClick },
      { element: this.viewBookmark, handler: this.viewBookmarkClick },
      { element: this.firstPage, handler: this.firstPageClick },
      { element: this.lastPage, handler: this.lastPageClick },
      { element: this.pageRotateCw, handler: this.pageRotateCwClick },
      { element: this.pageRotateCcw, handler: this.pageRotateCcwClick },
      { element: this.documentPropertiesButton,
        handler: this.documentPropertiesClick }
    ];

    for (var item in elements) {
      var element = elements[item].element;
      if (element) {
        element.addEventListener('click', elements[item].handler.bind(this));
      }
    }
  },

  // Event handling functions.
  presentationModeClick: function secondaryToolbarPresentationModeClick(evt) {
    this.presentationMode.request();
    this.close();
  },

  openFileClick: function secondaryToolbarOpenFileClick(evt) {
    document.getElementById('fileInput').click();
    this.close();
  },

  printClick: function secondaryToolbarPrintClick(evt) {
    window.print();
    this.close();
  },

  downloadClick: function secondaryToolbarDownloadClick(evt) {
    PDFView.download();
    this.close();
  },

  viewBookmarkClick: function secondaryToolbarViewBookmarkClick(evt) {
    this.close();
  },

  firstPageClick: function secondaryToolbarFirstPageClick(evt) {
    PDFView.page = 1;
    this.close();
  },

  lastPageClick: function secondaryToolbarLastPageClick(evt) {
    PDFView.page = PDFView.pdfDocument…