pdfjs-dist/web/pdf_viewer.js

/* Copyright 2014 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.
 */
(function (root, factory) {
  'use strict';
  if (typeof define === 'function' && define.amd) {
    define('pdfjs-dist/web/pdf_viewer', [
      'exports',
      'pdfjs-dist/build/pdf'
    ], factory);
  } else if (typeof exports !== 'undefined') {
    factory(exports, require('../build/pdf.js'));
  } else {
    factory(root.pdfjsDistWebPDFViewer = {}, root.pdfjsDistBuildPdf);
  }
}(this, function (exports, pdfjsLib) {
  'use strict';
  var pdfViewerLibs = { pdfjsWebPDFJS: pdfjsLib };
  (function () {
    (function (root, factory) {
      factory(root.pdfjsWebPDFRenderingQueue = {});
    }(this, function (exports) {
      var CLEANUP_TIMEOUT = 30000;
      var RenderingStates = {
        INITIAL: 0,
        RUNNING: 1,
        PAUSED: 2,
        FINISHED: 3
      };
      /**
       * Controls rendering of the views for pages and thumbnails.
       * @class
       */
      var PDFRenderingQueue = function PDFRenderingQueueClosure() {
        /**
         * @constructs
         */
        function PDFRenderingQueue() {
          this.pdfViewer = null;
          this.pdfThumbnailViewer = null;
          this.onIdle = null;
          this.highestPriorityPage = null;
          this.idleTimeout = null;
          this.printing = false;
          this.isThumbnailViewEnabled = false;
        }
        PDFRenderingQueue.prototype = /** @lends PDFRenderingQueue.prototype */
        {
          /**
           * @param {PDFViewer} pdfViewer
           */
          setViewer: function PDFRenderingQueue_setViewer(pdfViewer) {
            this.pdfViewer = pdfViewer;
          },
          /**
           * @param {PDFThumbnailViewer} pdfThumbnailViewer
           */
          setThumbnailViewer: function PDFRenderingQueue_setThumbnailViewer(pdfThumbnailViewer) {
            this.pdfThumbnailViewer = pdfThumbnailViewer;
          },
          /**
           * @param {IRenderableView} view
           * @returns {boolean}
           */
          isHighestPriority: function PDFRenderingQueue_isHighestPriority(view) {
            return this.highestPriorityPage === view.renderingId;
          },
          renderHighestPriority: function PDFRenderingQueue_renderHighestPriority(currentlyVisiblePages) {
            if (this.idleTimeout) {
              clearTimeout(this.idleTimeout);
              this.idleTimeout = null;
            }
            // Pages have a higher priority than thumbnails, so check them first.
            if (this.pdfViewer.forceRendering(currentlyVisiblePages)) {
              return;
            }
            // No pages needed rendering so check thumbnails.
            if (this.pdfThumbnailViewer && this.isThumbnailViewEnabled) {
              if (this.pdfThumbnailViewer.forceRendering()) {
                return;
              }
            }
            if (this.printing) {
              // If printing is currently ongoing do not reschedule cleanup.
              return;
            }
            if (this.onIdle) {
              this.idleTimeout = setTimeout(this.onIdle.bind(this), CLEANUP_TIMEOUT);
            }
          },
          getHighestPriority: function PDFRenderingQueue_getHighestPriority(visible, views, scrolledDown) {
            // The state has changed figure out which page has the highest priority to
            // render next (if any).
            // Priority:
            // 1 visible pages
            // 2 if last scrolled down page after the visible pages
            // 2 if last scrolled up page before the visible pages
            var visibleViews = visible.views;
            var numVisible = visibleViews.length;
            if (numVisible === 0) {
              return false;
            }
            for (var i = 0; i < numVisible; ++i) {
              var view = visibleViews[i].view;
              if (!this.isViewFinished(view)) {
                return view;
              }
            }
            // All the visible views have rendered, try to render next/previous pages.
            if (scrolledDown) {
              var nextPageIndex = visible.last.id;
              // ID's start at 1 so no need to add 1.
              if (views[nextPageIndex] && !this.isViewFinished(views[nextPageIndex])) {
                return views[nextPageIndex];
              }
            } else {
              var previousPageIndex = visible.first.id - 2;
              if (views[previousPageIndex] && !this.isViewFinished(views[previousPageIndex])) {
                return views[previousPageIndex];
              }
            }
            // Everything that needs to be rendered has been.
            return null;
          },
          /**
           * @param {IRenderableView} view
           * @returns {boolean}
           */
          isViewFinished: function PDFRenderingQueue_isViewFinished(view) {
            return view.renderingState === RenderingStates.FINISHED;
          },
          /**
           * Render a page or thumbnail view. This calls the appropriate function
           * based on the views state. If the view is already rendered it will return
           * false.
           * @param {IRenderableView} view
           */
          renderView: function PDFRenderingQueue_renderView(view) {
            var state = view.renderingState;
            switch (state) {
            case RenderingStates.FINISHED:
              return false;
            case RenderingStates.PAUSED:
              this.highestPriorityPage = view.renderingId;
              view.resume();
              break;
            case RenderingStates.RUNNING:
              this.highestPriorityPage = view.renderingId;
              break;
            case RenderingStates.INITIAL:
              this.highestPriorityPage = view.renderingId;
              var continueRendering = function () {
                this.renderHighestPriority();
              }.bind(this);
              view.draw().then(continueRendering, continueRendering);
              break;
            }
            return true;
          }
        };
        return PDFRenderingQueue;
      }();
      exports.RenderingStates = RenderingStates;
      exports.PDFRenderingQueue = PDFRenderingQueue;
    }));
    (function (root, factory) {
      factory(root.pdfjsWebDownloadManager = {}, root.pdfjsWebPDFJS);
    }(this, function (exports, pdfjsLib) {
      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 (!pdfjsLib.createValidAbsoluteUrl(url, 'http://example.com')) {
            return;
          }
          // restricted/invalid URL
          download(url + '#pdfjs.action=download', filename);
        },
        downloadData: function DownloadManager_downloadData(data, filename, contentType) {
          if (navigator.msSaveBlob) {
            // IE10 and above
            return navigator.msSaveBlob(new Blob([data], { type: contentType }), filename);
          }
          var blobUrl = pdfjsLib.createObjectURL(data, contentType, pdfjsLib.PDFJS.disableCreateObjectURL);
          download(blobUrl, 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);
        }
      };
      exports.DownloadManager = DownloadManager;
    }));
    (function (root, factory) {
      factory(root.pdfjsWebUIUtils = {}, root.pdfjsWebPDFJS);
    }(this, function (exports, pdfjsLib) {
      var CSS_UNITS = 96.0 / 72.0;
      var DEFAULT_SCALE_VALUE = 'auto';
      var DEFAULT_SCALE = 1.0;
      var UNKNOWN_SCALE = 0;
      var MAX_AUTO_SCALE = 1.25;
      var SCROLLBAR_PADDING = 40;
      var VERTICAL_PADDING = 5;
      var mozL10n = document.mozL10n || document.webL10n;
      var PDFJS = pdfjsLib.PDFJS;
      /**
       * Disables fullscreen support, and by extension Presentation Mode,
       * in browsers which support the fullscreen API.
       * @var {boolean}
       */
      PDFJS.disableFullscreen = PDFJS.disableFullscreen === undefined ? false : PDFJS.disableFullscreen;
      /**
       * Enables CSS only zooming.
       * @var {boolean}
       */
      PDFJS.useOnlyCssZoom = PDFJS.useOnlyCssZoom === undefined ? false : PDFJS.useOnlyCssZoom;
      /**
       * The maximum supported canvas size in total pixels e.g. width * height.
       * The default value is 4096 * 4096. Use -1 for no limit.
       * @var {number}
       */
      PDFJS.maxCanvasPixels = PDFJS.maxCanvasPixels === undefined ? 16777216 : PDFJS.maxCanvasPixels;
      /**
       * Disables saving of the last position of the viewed PDF.
       * @var {boolean}
       */
      PDFJS.disableHistory = PDFJS.disableHistory === undefined ? false : PDFJS.disableHistory;
      /**
       * Disables creation of the text layer that used for text selection and search.
       * @var {boolean}
       */
      PDFJS.disableTextLayer = PDFJS.disableTextLayer === undefined ? false : PDFJS.disableTextLayer;
      /**
       * Disables maintaining the current position in the document when zooming.
       */
      PDFJS.ignoreCurrentPositionOnZoom = PDFJS.ignoreCurrentPositionOnZoom === undefined ? false : PDFJS.ignoreCurrentPositionOnZoom;
      /**
       * Interface locale settings.
       * @var {string}
       */
      PDFJS.locale = PDFJS.locale === undefined ? navigator.language : PDFJS.locale;
      /**
       * 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.
       * @param {Object} element - The element to be visible.
       * @param {Object} spot - An object with optional top and left properties,
       *   specifying the offset from the top left edge.
       * @param {boolean} skipOverflowHiddenElements - Ignore elements that have
       *   the CSS rule `overflow: hidden;` set. The default is false.
       */
      function scrollIntoView(element, spot, skipOverflowHiddenElements) {
        // 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;
        if (!parent) {
          console.error('offsetParent is not set -- cannot scroll');
          return;
        }
        var checkOverflow = skipOverflowHiddenElements || false;
        var offsetY = element.offsetTop + element.clientTop;
        var offsetX = element.offsetLeft + element.clientLeft;
        while (parent.clientHeight === parent.scrollHeight || checkOverflow && getComputedStyle(parent).overflow === 'hidden') {
          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;
      }
      /**
       * Helper function to start monitoring the scroll event and converting them into
       * PDF.js friendly one: with scroll debounce and scroll direction.
       */
      function watchScroll(viewAreaElement, callback) {
        var debounceScroll = function debounceScroll(evt) {
          if (rAF) {
            return;
          }
          // schedule an invocation of scroll for next animation frame.
          rAF = window.requestAnimationFrame(function viewAreaElementScrolled() {
            rAF = null;
            var currentY = viewAreaElement.scrollTop;
            var lastY = state.lastY;
            if (currentY !== lastY) {
              state.down = currentY > lastY;
            }
            state.lastY = currentY;
            callback(state);
          });
        };
        var state = {
          down: true,
          lastY: viewAreaElement.scrollTop,
          _eventHandler: debounceScroll
        };
        var rAF = null;
        viewAreaElement.addEventListener('scroll', debounceScroll, true);
        return state;
      }
      /**
       * Helper function to parse query string (e.g. ?param1=value&parm2=...).
       */
      function parseQueryString(query) {
        var parts = query.split('&');
        var params = {};
        for (var i = 0, ii = parts.length; i < ii; ++i) {
          var param = parts[i].split('=');
          var key = param[0].toLowerCase();
          var value = param.length > 1 ? param[1] : null;
          params[decodeURIComponent(key)] = decodeURIComponent(value);
        }
        return params;
      }
      /**
       * Use binary search to find the index of the first item in a given array which
       * passes a given condition. The items are expected to be sorted in the sense
       * that if the condition is true for one item in the array, then it is also true
       * for all following items.
       *
       * @returns {Number} Index of the first array element to pass the test,
       *                   or |items.length| if no such element exists.
       */
      function binarySearchFirstItem(items, condition) {
        var minIndex = 0;
        var maxIndex = items.length - 1;
        if (items.length === 0 || !condition(items[maxIndex])) {
          return items.length;
        }
        if (condition(items[minIndex])) {
          return minIndex;
        }
        while (minIndex < maxIndex) {
          var currentIndex = minIndex + maxIndex >> 1;
          var currentItem = items[currentIndex];
          if (condition(currentItem)) {
            maxIndex = currentIndex;
          } else {
            minIndex = currentIndex + 1;
          }
        }
        return minIndex;
      }
      /* === maxIndex */
      /**
       *  Approximates float number as a fraction using Farey sequence (max order
       *  of 8).
       *  @param {number} x - Positive float number.
       *  @returns {Array} Estimated fraction: the first array item is a numerator,
       *                   the second one is a denominator.
       */
      function approximateFraction(x) {
        // Fast paths for int numbers or their inversions.
        if (Math.floor(x) === x) {
          return [
            x,
            1
          ];
        }
        var xinv = 1 / x;
        var limit = 8;
        if (xinv > limit) {
          return [
            1,
            limit
          ];
        } else if (Math.floor(xinv) === xinv) {
          return [
            1,
            xinv
          ];
        }
        var x_ = x > 1 ? xinv : x;
        // a/b and c/d are neighbours in Farey sequence.
        var a = 0, b = 1, c = 1, d = 1;
        // Limiting search to order 8.
        while (true) {
          // Generating next term in sequence (order of q).
          var p = a + c, q = b + d;
          if (q > limit) {
            break;
          }
          if (x_ <= p / q) {
            c = p;
            d = q;
          } else {
            a = p;
            b = q;
          }
        }
        // Select closest of the neighbours to x.
        if (x_ - a / b < c / d - x_) {
          return x_ === x ? [
            a,
            b
          ] : [
            b,
            a
          ];
        } else {
          return x_ === x ? [
            c,
            d
          ] : [
            d,
            c
          ];
        }
      }
      function roundToDivide(x, div) {
        var r = x % div;
        return r === 0 ? x : Math.round(x - r + div);
      }
      /**
       * Generic helper to find out what elements are visible within a scroll pane.
       */
      function getVisibleElements(scrollEl, views, sortByVisibility) {
        var top = scrollEl.scrollTop, bottom = top + scrollEl.clientHeight;
        var left = scrollEl.scrollLeft, right = left + scrollEl.clientWidth;
        function isElementBottomBelowViewTop(view) {
          var element = view.div;
          var elementBottom = element.offsetTop + element.clientTop + element.clientHeight;
          return elementBottom > top;
        }
        var visible = [], view, element;
        var currentHeight, viewHeight, hiddenHeight, percentHeight;
        var currentWidth, viewWidth;
        var firstVisibleElementInd = views.length === 0 ? 0 : binarySearchFirstItem(views, isElementBottomBelowViewTop);
        for (var i = firstVisibleElementInd, ii = views.length; i < ii; i++) {
          view = views[i];
          element = view.div;
          currentHeight = element.offsetTop + element.clientTop;
          viewHeight = element.clientHeight;
          if (currentHeight > bottom) {
            break;
          }
          currentWidth = element.offsetLeft + element.clientLeft;
          viewWidth = element.clientWidth;
          if (currentWidth + viewWidth < left || currentWidth > right) {
            continue;
          }
          hiddenHeight = Math.max(0, top - currentHeight) + Math.max(0, currentHeight + viewHeight - bottom);
          percentHeight = (viewHeight - hiddenHeight) * 100 / viewHeight | 0;
          visible.push({
            id: view.id,
            x: currentWidth,
            y: currentHeight,
            view: view,
            percent: percentHeight
          });
        }
        var first = visible[0];
        var last = visible[visible.length - 1];
        if (sortByVisibility) {
          visible.sort(function (a, b) {
            var pc = a.percent - b.percent;
            if (Math.abs(pc) > 0.001) {
              return -pc;
            }
            return a.id - b.id;
          });
        }
        // ensure stability
        return {
          first: first,
          last: last,
          views: visible
        };
      }
      /**
       * 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) {
            }
          }
        }
        return suggestedFilename || 'document.pdf';
      }
      function normalizeWheelEventDelta(evt) {
        var delta = Math.sqrt(evt.deltaX * evt.deltaX + evt.deltaY * evt.deltaY);
        var angle = Math.atan2(evt.deltaY, evt.deltaX);
        if (-0.25 * Math.PI < angle && angle < 0.75 * Math.PI) {
          // All that is left-up oriented has to change the sign.
          delta = -delta;
        }
        var MOUSE_DOM_DELTA_PIXEL_MODE = 0;
        var MOUSE_DOM_DELTA_LINE_MODE = 1;
        var MOUSE_PIXELS_PER_LINE = 30;
        var MOUSE_LINES_PER_PAGE = 30;
        // Converts delta to per-page units
        if (evt.deltaMode === MOUSE_DOM_DELTA_PIXEL_MODE) {
          delta /= MOUSE_PIXELS_PER_LINE * MOUSE_LINES_PER_PAGE;
        } else if (evt.deltaMode === MOUSE_DOM_DELTA_LINE_MODE) {
          delta /= MOUSE_LINES_PER_PAGE;
        }
        return delta;
      }
      /**
       * Simple event bus for an application. Listeners are attached using the
       * `on` and `off` methods. To raise an event, the `dispatch` method shall be
       * used.
       */
      var EventBus = function EventBusClosure() {
        function EventBus() {
          this._listeners = Object.create(null);
        }
        EventBus.prototype = {
          on: function EventBus_on(eventName, listener) {
            var eventListeners = this._listeners[eventName];
            if (!eventListeners) {
              eventListeners = [];
              this._listeners[eventName] = eventListeners;
            }
            eventListeners.push(listener);
          },
          off: function EventBus_on(eventName, listener) {
            var eventListeners = this._listeners[eventName];
            var i;
            if (!eventListeners || (i = eventListeners.indexOf(listener)) < 0) {
              return;
            }
            eventListeners.splice(i, 1);
          },
          dispatch: function EventBus_dispath(eventName) {
            var eventListeners = this._listeners[eventName];
            if (!eventListeners || eventListeners.length === 0) {
              return;
            }
            // Passing all arguments after the eventName to the listeners.
            var args = Array.prototype.slice.call(arguments, 1);
            // Making copy of the listeners array in case if it will be modified
            // during dispatch.
            eventListeners.slice(0).forEach(function (listener) {
              listener.apply(null, args);
            });
          }
        };
        return EventBus;
      }();
      var ProgressBar = function ProgressBarClosure() {
        function clamp(v, min, max) {
          return Math.min(Math.max(v, min), max);
        }
        function ProgressBar(id, opts) {
          this.visible = true;
          // 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() {
            if (!this.visible) {
              return;
            }
            this.visible = false;
            this.bar.classList.add('hidden');
            document.body.classList.remove('loadingInProgress');
          },
          show: function ProgressBar_show() {
            if (this.visible) {
              return;
            }
            this.visible = true;
            document.body.classList.add('loadingInProgress');
            this.bar.classList.remove('hidden');
          }
        };
        return ProgressBar;
      }();
      exports.CSS_UNITS = CSS_UNITS;
      exports.DEFAULT_SCALE_VALUE = DEFAULT_SCALE_VALUE;
      exports.DEFAULT_SCALE = DEFAULT_SCALE;
      exports.UNKNOWN_SCALE = UNKNOWN_SCALE;
      exports.MAX_AUTO_SCALE = MAX_AUTO_SCALE;
      exports.SCROLLBAR_PADDING = SCROLLBAR_PADDING;
      exports.VERTICAL_PADDING = VERTICAL_PADDING;
      exports.mozL10n = mozL10n;
      exports.EventBus = EventBus;
      exports.ProgressBar = ProgressBar;
      exports.getPDFFileNameFromURL = getPDFFileNameFromURL;
      exports.noContextMenuHandler = noContextMenuHandler;
      exports.parseQueryString = parseQueryString;
      exports.getVisibleElements = getVisibleElements;
      exports.roundToDivide = roundToDivide;
      exports.approximateFraction = approximateFraction;
      exports.getOutputScale = getOutputScale;
      exports.scrollIntoView = scrollIntoView;
      exports.watchScroll = watchScroll;
      exports.binarySearchFirstItem = binarySearchFirstItem;
      exports.normalizeWheelEventDelta = normalizeWheelEventDelta;
    }));
    (function (root, factory) {
      factory(root.pdfjsWebDOMEvents = {}, root.pdfjsWebUIUtils);
    }(this, function (exports, uiUtils) {
      var EventBus = uiUtils.EventBus;
      // Attaching to the application event bus to dispatch events to the DOM for
      // backwards viewer API compatibility.
      function attachDOMEventsToEventBus(eventBus) {
        eventBus.on('documentload', function () {
          var event = document.createEvent('CustomEvent');
          event.initCustomEvent('documentload', true, true, {});
          window.dispatchEvent(event);
        });
        eventBus.on('pagerendered', function (e) {
          var event = document.createEvent('CustomEvent');
          event.initCustomEvent('pagerendered', true, true, {
            pageNumber: e.pageNumber,
            cssTransform: e.cssTransform
          });
          e.source.div.dispatchEvent(event);
        });
        eventBus.on('textlayerrendered', function (e) {
          var event = document.createEvent('CustomEvent');
          event.initCustomEvent('textlayerrendered', true, true, { pageNumber: e.pageNumber });
          e.source.textLayerDiv.dispatchEvent(event);
        });
        eventBus.on('pagechange', function (e) {
          var event = document.createEvent('UIEvents');
          event.initUIEvent('pagechange', true, true, window, 0);
          event.pageNumber = e.pageNumber;
          e.source.container.dispatchEvent(event);
        });
        eventBus.on('pagesinit', function (e) {
          var event = document.createEvent('CustomEvent');
          event.initCustomEvent('pagesinit', true, true, null);
          e.source.container.dispatchEvent(event);
        });
        eventBus.on('pagesloaded', function (e) {
          var event = document.createEvent('CustomEvent');
          event.initCustomEvent('pagesloaded', true, true, { pagesCount: e.pagesCount });
          e.source.container.dispatchEvent(event);
        });
        eventBus.on('scalechange', function (e) {
          var event = document.createEvent('UIEvents');
          event.initUIEvent('scalechange', true, true, window, 0);
          event.scale = e.scale;
          event.presetValue = e.presetValue;
          e.source.container.dispatchEvent(event);
        });
        eventBus.on('updateviewarea', function (e) {
          var event = document.createEvent('UIEvents');
          event.initUIEvent('updateviewarea', true, true, window, 0);
          event.location = e.location;
          e.source.container.dispatchEvent(event);
        });
        eventBus.on('find', function (e) {
          if (e.source === window) {
            return;
          }
          // event comes from FirefoxCom, no need to replicate
          var event = document.createEvent('CustomEvent');
          event.initCustomEvent('find' + e.type, true, true, {
            query: e.query,
            phraseSearch: e.phraseSearch,
            caseSensitive: e.caseSensitive,
            highlightAll: e.highlightAll,
            findPrevious: e.findPrevious
          });
          window.dispatchEvent(event);
        });
        eventBus.on('attachmentsloaded', function (e) {
          var event = document.createEvent('CustomEvent');
          event.initCustomEvent('attachmentsloaded', true, true, { attachmentsCount: e.attachmentsCount });
          e.source.container.dispatchEvent(event);
        });
        eventBus.on('sidebarviewchanged', function (e) {
          var event = document.createEvent('CustomEvent');
          event.initCustomEvent('sidebarviewchanged', true, true, { view: e.view });
          e.source.outerContainer.dispatchEvent(event);
        });
        eventBus.on('pagemode', function (e) {
          var event = document.createEvent('CustomEvent');
          event.initCustomEvent('pagemode', true, true, { mode: e.mode });
          e.source.pdfViewer.container.dispatchEvent(event);
        });
        eventBus.on('namedaction', function (e) {
          var event = document.createEvent('CustomEvent');
          event.initCustomEvent('namedaction', true, true, { action: e.action });
          e.source.pdfViewer.container.dispatchEvent(event);
        });
        eventBus.on('presentationmodechanged', function (e) {
          var event = document.createEvent('CustomEvent');
          event.initCustomEvent('presentationmodechanged', true, true, {
            active: e.active,
            switchInProgress: e.switchInProgress
          });
          window.dispatchEvent(event);
        });
        eventBus.on('outlineloaded', function (e) {
          var event = document.createEvent('CustomEvent');
          event.initCustomEvent('outlineloaded', true, true, { outlineCount: e.outlineCount });
          e.source.container.dispatchEvent(event);
        });
      }
      var globalEventBus = null;
      function getGlobalEventBus() {
        if (globalEventBus) {
          return globalEventBus;
        }
        globalEventBus = new EventBus();
        attachDOMEventsToEventBus(globalEventBus);
        return globalEventBus;
      }
      exports.attachDOMEventsToEventBus = attachDOMEventsToEventBus;
      exports.getGlobalEventBus = getGlobalEventBus;
    }));
    (function (root, factory) {
      factory(root.pdfjsWebPDFFindController = {}, root.pdfjsWebUIUtils);
    }(this, function (exports, uiUtils) {
      var scrollIntoView = uiUtils.scrollIntoView;
      var FindStates = {
        FIND_FOUND: 0,
        FIND_NOTFOUND: 1,
        FIND_WRAPPED: 2,
        FIND_PENDING: 3
      };
      var FIND_SCROLL_OFFSET_TOP = -50;
      var FIND_SCROLL_OFFSET_LEFT = -400;
      var CHARACTERS_TO_NORMALIZE = {
        '\u2018': '\'',
        // Left single quotation mark
        '\u2019': '\'',
        // Right single quotation mark
        '\u201A': '\'',
        // Single low-9 quotation mark
        '\u201B': '\'',
        // Single high-reversed-9 quotation mark
        '\u201C': '"',
        // Left double quotation mark
        '\u201D': '"',
        // Right double quotation mark
        '\u201E': '"',
        // Double low-9 quotation mark
        '\u201F': '"',
        // Double high-reversed-9 quotation mark
        '\u00BC': '1/4',
        // Vulgar fraction one quarter
        '\u00BD': '1/2',
        // Vulgar fraction one half
        '\u00BE': '3/4'
      };
      // Vulgar fraction three quarters
      /**
       * Provides "search" or "find" functionality for the PDF.
       * This object actually performs the search for a given string.
       */
      var PDFFindController = function PDFFindControllerClosure() {
        function PDFFindController(options) {
          this.pdfViewer = options.pdfViewer || null;
          this.onUpdateResultsCount = null;
          this.onUpdateState = null;
          this.reset();
          // Compile the regular expression for text normalization once.
          var replace = Object.keys(CHARACTERS_TO_NORMALIZE).join('');
          this.normalizationRegex = new RegExp('[' + replace + ']', 'g');
        }
        PDFFindController.prototype = {
          reset: function PDFFindController_reset() {
            this.startedTextExtraction = false;
            this.extractTextPromises = [];
            this.pendingFindMatches = Object.create(null);
            this.active = false;
            // If active, find results will be highlighted.
            this.pageContents = [];
            // Stores the text for each page.
            this.pageMatches = [];
            this.pageMatchesLength = null;
            this.matchCount = 0;
            this.selected = {
              // Currently selected match.
              pageIdx: -1,
              matchIdx: -1
            };
            this.offset = {
              // Where the find algorithm currently is in the document.
              pageIdx: null,
              matchIdx: null
            };
            this.pagesToSearch = null;
            this.resumePageIdx = null;
            this.state = null;
            this.dirtyMatch = false;
            this.findTimeout = null;
            this.firstPagePromise = new Promise(function (resolve) {
              this.resolveFirstPage = resolve;
            }.bind(this));
          },
          normalize: function PDFFindController_normalize(text) {
            return text.replace(this.normalizationRegex, function (ch) {
              return CHARACTERS_TO_NORMALIZE[ch];
            });
          },
          // Helper for multiple search - fills matchesWithLength array
          // and takes into account cases when one search term
          // include another search term (for example, "tamed tame" or "this is").
          // Looking for intersecting terms in the 'matches' and
          // leave elements with a longer match-length.
          _prepareMatches: function PDFFindController_prepareMatches(matchesWithLength, matches, matchesLength) {
            function isSubTerm(matchesWithLength, currentIndex) {
              var currentElem, prevElem, nextElem;
              currentElem = matchesWithLength[currentIndex];
              nextElem = matchesWithLength[currentIndex + 1];
              // checking for cases like "TAMEd TAME"
              if (currentIndex < matchesWithLength.length - 1 && currentElem.match === nextElem.match) {
                currentElem.skipped = true;
                return true;
              }
              // checking for cases like "thIS IS"
              for (var i = currentIndex - 1; i >= 0; i--) {
                prevElem = matchesWithLength[i];
                if (prevElem.skipped) {
                  continue;
                }
                if (prevElem.match + prevElem.matchLength < currentElem.match) {
                  break;
                }
                if (prevElem.match + prevElem.matchLength >= currentElem.match + currentElem.matchLength) {
                  currentElem.skipped = true;
                  return true;
                }
              }
              return false;
            }
            var i, len;
            // Sorting array of objects { match: <match>, matchLength: <matchLength> }
            // in increasing index first and then the lengths.
            matchesWithLength.sort(function (a, b) {
              return a.match === b.match ? a.matchLength - b.matchLength : a.match - b.match;
            });
            for (i = 0, len = matchesWithLength.length; i < len; i++) {
              if (isSubTerm(matchesWithLength, i)) {
                continue;
              }
              matches.push(matchesWithLength[i].match);
              matchesLength.push(matchesWithLength[i].matchLength);
            }
          },
          calcFindPhraseMatch: function PDFFindController_calcFindPhraseMatch(query, pageIndex, pageContent) {
            var matches = [];
            var queryLen = query.length;
            var matchIdx = -queryLen;
            while (true) {
              matchIdx = pageContent.indexOf(query, matchIdx + queryLen);
              if (matchIdx === -1) {
                break;
              }
              matches.push(matchIdx);
            }
            this.pageMatches[pageIndex] = matches;
          },
          calcFindWordMatch: function PDFFindController_calcFindWordMatch(query, pageIndex, pageContent) {
            var matchesWithLength = [];
            // Divide the query into pieces and search for text on each piece.
            var queryArray = query.match(/\S+/g);
            var subquery, subqueryLen, matchIdx;
            for (var i = 0, len = queryArray.length; i < len; i++) {
              subquery = queryArray[i];
              subqueryLen = subquery.length;
              matchIdx = -subqueryLen;
              while (true) {
                matchIdx = pageContent.indexOf(subquery, matchIdx + subqueryLen);
                if (matchIdx === -1) {
                  break;
                }
                // Other searches do not, so we store the length.
                matchesWithLength.push({
                  match: matchIdx,
                  matchLength: subqueryLen,
                  skipped: false
                });
              }
            }
            // Prepare arrays for store the matches.
            if (!this.pageMatchesLength) {
              this.pageMatchesLength = [];
            }
            this.pageMatchesLength[pageIndex] = [];
            this.pageMatches[pageIndex] = [];
            // Sort matchesWithLength, clean up intersecting terms
            // and put the result into the two arrays.
            this._prepareMatches(matchesWithLength, this.pageMatches[pageIndex], this.pageMatchesLength[pageIndex]);
          },
          calcFindMatch: function PDFFindController_calcFindMatch(pageIndex) {
            var pageContent = this.normalize(this.pageContents[pageIndex]);
            var query = this.normalize(this.state.query);
            var caseSensitive = this.state.caseSensitive;
            var phraseSearch = this.state.phraseSearch;
            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();
            }
            if (phraseSearch) {
              this.calcFindPhraseMatch(query, pageIndex, pageContent);
            } else {
              this.calcFindWordMatch(query, pageIndex, pageContent);
            }
            this.updatePage(pageIndex);
            if (this.resumePageIdx === pageIndex) {
              this.resumePageIdx = null;
              this.nextPageMatch();
            }
            // Update the matches count
            if (this.pageMatches[pageIndex].length > 0) {
              this.matchCount += this.pageMatches[pageIndex].length;
              this.updateUIResultsCount();
            }
          },
          extractText: function PDFFindController_extractText() {
            if (this.startedTextExtraction) {
              return;
            }
            this.startedTextExtraction = true;
            this.pageContents = [];
            var extractTextPromisesResolves = [];
            var numPages = this.pdfViewer.pagesCount;
            for (var i = 0; i < numPages; i++) {
              this.extractTextPromises.push(new Promise(function (resolve) {
                extractTextPromisesResolves.push(resolve);
              }));
            }
            var self = this;
            function extractPageText(pageIndex) {
              self.pdfViewer.getPageTextContent(pageIndex).then(function textContentResolved(textContent) {
                var textItems = textContent.items;
                var str = [];
                for (var i = 0, len = textItems.length; i < len; i++) {
                  str.push(textItems[i].str);
                }
                // Store the pageContent as a string.
                self.pageContents.push(str.join(''));
                extractTextPromisesResolves[pageIndex](pageIndex);
                if (pageIndex + 1 < self.pdfViewer.pagesCount) {
                  extractPageText(pageIndex + 1);
                }
              });
            }
            extractPageText(0);
          },
          executeCommand: function PDFFindController_executeCommand(cmd, state) {
            if (this.state === null || cmd !== 'findagain') {
              this.dirtyMatch = true;
            }
            this.state = state;
            this.updateUIState(FindStates.FIND_PENDING);
            this.firstPagePromise.then(function () {
              this.extractText();
              clearTimeout(this.findTimeout);
              if (cmd === '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 PDFFindController_updatePage(index) {
            if (this.selected.pageIdx === index) {
              // 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.
              this.pdfViewer.currentPageNumber = index + 1;
            }
            var page = this.pdfViewer.getPageView(index);
            if (page.textLayer) {
              page.textLayer.updateMatches();
            }
          },
          nextMatch: function PDFFindController_nextMatch() {
            var previous = this.state.findPrevious;
            var currentPageIndex = this.pdfViewer.currentPageNumber - 1;
            var numPages = this.pdfViewer.pagesCount;
            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 = [];
              this.matchCount = 0;
              this.pageMatchesLength = null;
              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;
            // Keep track of how many pages we should maximally iterate through.
            this.pagesToSearch = numPages;
            // 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 PDFFindController_matchesReady(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);
              return true;
            } else {
              // No matches, so attempt to search the next page.
              this.advanceOffsetPage(previous);
              if (offset.wrapped) {
                offset.matchIdx = null;
                if (this.pagesToSearch < 0) {
                  // No point in wrapping again, 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;
            }
          },
          /**
           * The method is called back from the text layer when match presentation
           * is updated.
           * @param {number} pageIndex - page index.
           * @param {number} index - match index.
           * @param {Array} elements - text layer div elements array.
           * @param {number} beginIdx - start index of the div array for the match.
           */
          updateMatchPosition: function PDFFindController_updateMatchPosition(pageIndex, index, elements, beginIdx) {
            if (this.selected.matchIdx === index && this.selected.pageIdx === pageIndex) {
              var spot = {
                top: FIND_SCROLL_OFFSET_TOP,
                left: FIND_SCROLL_OFFSET_LEFT
              };
              scrollIntoView(elements[beginIdx], spot, /* skipOverflowHiddenElements = */
              true);
            }
          },
          nextPageMatch: function PDFFindController_nextPageMatch() {
            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 PDFFindController_advanceOffsetPage(previous) {
            var offset = this.offset;
            var numPages = this.extractTextPromises.length;
            offset.pageIdx = previous ? offset.pageIdx - 1 : offset.pageIdx + 1;
            offset.matchIdx = null;
            this.pagesToSearch--;
            if (offset.pageIdx >= numPages || offset.pageIdx < 0) {
              offset.pageIdx = previous ? numPages - 1 : 0;
              offset.wrapped = true;
            }
          },
          updateMatch: function PDFFindController_updateMatch(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);
            }
          },
          updateUIResultsCount: function PDFFindController_updateUIResultsCount() {
            if (this.onUpdateResultsCount) {
              this.onUpdateResultsCount(this.matchCount);
            }
          },
          updateUIState: function PDFFindController_updateUIState(state, previous) {
            if (this.onUpdateState) {
              this.onUpdateState(state, previous, this.matchCount);
            }
          }
        };
        return PDFFindController;
      }();
      exports.FindStates = FindStates;
      exports.PDFFindController = PDFFindController;
    }));
    (function (root, factory) {
      factory(root.pdfjsWebPDFHistory = {}, root.pdfjsWebDOMEvents);
    }(this, function (exports, domEvents) {
      function PDFHistory(options) {
        this.linkService = options.linkService;
        this.eventBus = options.eventBus || domEvents.getGlobalEventBus();
        this.initialized = false;
        this.initialDestination = null;
        this.initialBookmark = null;
      }
      PDFHistory.prototype = {
        /**
         * @param {string} fingerprint
         */
        initialize: function pdfHistoryInitialize(fingerprint) {
          this.initialized = true;
          this.reInitialized = false;
          this.allowHashChange = true;
          this.historyUnlocked = true;
          this.isViewerInPresentationMode = false;
          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 {
              this.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) {
            if (!self.historyUnlocked) {
              return;
            }
            if (evt.state) {
              // Move back/forward in the history.
              self._goTo(evt.state);
              return;
            }
            // If the state is not set, then the user tried to navigate to a
            // different hash by manually editing the URL and pressing Enter, or by
            // clicking on an in-page link (e.g. the "current view" link).
            // Save the current view state to the browser history.
            // Note: In Firefox, history.null could also be null after an in-page
            // navigation to the same URL, and without dispatching the popstate
            // event: https://bugzilla.mozilla.org/show_bug.cgi?id=1183881
            if (self.uid === 0) {
              // Replace the previous state if it was not explicitly set.
              var previousParams = self.previousHash && self.currentBookmark && self.previousHash !== self.currentBookmark ? {
                hash: self.currentBookmark,
                page: self.currentPage
              } : { page: 1 };
              replacePreviousHistoryState(previousParams, function () {
                updateHistoryWithCurrentHash();
              });
            } else {
              updateHistoryWithCurrentHash();
            }
          }, false);
          function updateHistoryWithCurrentHash() {
            self.previousHash = window.location.hash.slice(1);
            self._pushToHistory({ hash: self.previousHash }, false, true);
            self._updatePreviousBookmark();
          }
          function replacePreviousHistoryState(params, callback) {
            // To modify the previous history entry, the following happens:
            // 1. history.back()
            // 2. _pushToHistory, which calls history.replaceState( ... )
            // 3. history.forward()
            // Because a navigation via the history API does not immediately update
            // the history state, the popstate event is used for synchronization.
            self.historyUnlocked = false;
            // Suppress the hashchange event to avoid side effects caused by
            // navigating back and forward.
            self.allowHashChange = false;
            window.addEventListener('popstate', rewriteHistoryAfterBack);
            history.back();
            function rewriteHistoryAfterBack() {
              window.removeEventListener('popstate', rewriteHistoryAfterBack);
              window.addEventListener('popstate', rewriteHistoryAfterForward);
              self._pushToHistory(params, false, true);
              history.forward();
            }
            function rewriteHistoryAfterForward() {
              window.removeEventListener('popstate', rewriteHistoryAfterForward);
              self.allowHashChange = true;
              self.historyUnlocked = true;
              callback();
            }
          }
          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);
          self.eventBus.on('presentationmodechanged', function (e) {
            self.isViewerInPresentationMode = e.active;
          });
        },
        clearHistoryState: function pdfHistory_clearHistoryState() {
          this._pushOrReplaceState(null, true);
        },
        _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;
          }
          return this.allowHashChange;
        },
        _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 : this.linkService.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 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 (this.isViewerInPresentationMode) {
            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) {
            this.linkService.navigateTo(state.target.dest);
          } else {
            this.linkService.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();
            }
          }
        }
      };
      exports.PDFHistory = PDFHistory;
    }));
    (function (root, factory) {
      factory(root.pdfjsWebPDFLinkService = {}, root.pdfjsWebUIUtils, root.pdfjsWebDOMEvents);
    }(this, function (exports, uiUtils, domEvents) {
      var parseQueryString = uiUtils.parseQueryString;
      var PageNumberRegExp = /^\d+$/;
      function isPageNumber(str) {
        return PageNumberRegExp.test(str);
      }
      /**
       * @typedef {Object} PDFLinkServiceOptions
       * @property {EventBus} eventBus - The application event bus.
       */
      /**
       * Performs navigation functions inside PDF, such as opening specified page,
       * or destination.
       * @class
       * @implements {IPDFLinkService}
       */
      var PDFLinkService = function PDFLinkServiceClosure() {
        /**
         * @constructs PDFLinkService
         * @param {PDFLinkServiceOptions} options
         */
        function PDFLinkService(options) {
          options = options || {};
          this.eventBus = options.eventBus || domEvents.getGlobalEventBus();
          this.baseUrl = null;
          this.pdfDocument = null;
          this.pdfViewer = null;
          this.pdfHistory = null;
          this._pagesRefCache = null;
        }
        PDFLinkService.prototype = {
          setDocument: function PDFLinkService_setDocument(pdfDocument, baseUrl) {
            this.baseUrl = baseUrl;
            this.pdfDocument = pdfDocument;
            this._pagesRefCache = Object.create(null);
          },
          setViewer: function PDFLinkService_setViewer(pdfViewer) {
            this.pdfViewer = pdfViewer;
          },
          setHistory: function PDFLinkService_setHistory(pdfHistory) {
            this.pdfHistory = pdfHistory;
          },
          /**
           * @returns {number}
           */
          get pagesCount() {
            return this.pdfDocument ? this.pdfDocument.numPages : 0;
          },
          /**
           * @returns {number}
           */
          get page() {
            return this.pdfViewer.currentPageNumber;
          },
          /**
           * @param {number} value
           */
          set page(value) {
            this.pdfViewer.currentPageNumber = value;
          },
          /**
           * @param dest - The PDF destination object.
           */
          navigateTo: function PDFLinkService_navigateTo(dest) {
            var destString = '';
            var self = this;
            var goToDestination = function (destRef) {
              // dest array looks like that: <page-ref> </XYZ|/FitXXX> <args..>
              var pageNumber = destRef instanceof Object ? self._pagesRefCache[destRef.num + ' ' + destRef.gen + ' R'] : destRef + 1;
              if (pageNumber) {
                if (pageNumber > self.pagesCount) {
                  console.error('PDFLinkService_navigateTo: ' + 'Trying to navigate to a non-existent page.');
                  return;
                }
                self.pdfViewer.scrollPageIntoView({
                  pageNumber: pageNumber,
                  destArray: dest
                });
                if (self.pdfHistory) {
                  // Update the browsing history.
                  self.pdfHistory.push({
                    dest: dest,
                    hash: destString,
                    page: pageNumber
                  });
                }
              } else {
                self.pdfDocument.getPageIndex(destRef).then(function (pageIndex) {
                  var pageNum = pageIndex + 1;
                  var cacheKey = destRef.num + ' ' + destRef.gen + ' R';
                  self._pagesRefCache[cacheKey] = pageNum;
                  goToDestination(destRef);
                });
              }
            };
            var destinationPromise;
            if (typeof dest === 'string') {
              destString = dest;
              destinationPromise = this.pdfDocument.getDestination(dest);
            } else {
              destinationPromise = Promise.resolve(dest);
            }
            destinationPromise.then(function (destination) {
              dest = destination;
              if (!(destination instanceof Array)) {
                return;
              }
              // invalid destination
              goToDestination(destination[0]);
            });
          },
          /**
           * @param dest - The PDF destination object.
           * @returns {string} The hyperlink to the PDF object.
           */
          getDestinationHash: function PDFLinkService_getDestinationHash(dest) {
            if (typeof dest === 'string') {
              // In practice, a named destination may contain only a number.
              // If that happens, use the '#nameddest=' form to avoid the link
              // redirecting to a page, instead of the correct destination.
              return this.getAnchorUrl('#' + (isPageNumber(dest) ? 'nameddest=' : '') + escape(dest));
            }
            if (dest instanceof Array) {
              var str = JSON.stringify(dest);
              return this.getAnchorUrl('#' + escape(str));
            }
            return this.getAnchorUrl('');
          },
          /**
           * Prefix the full url on anchor links to make sure that links are resolved
           * relative to the current URL instead of the one defined in <base href>.
           * @param {String} anchor The anchor hash, including the #.
           * @returns {string} The hyperlink to the PDF object.
           */
          getAnchorUrl: function PDFLinkService_getAnchorUrl(anchor) {
            return (this.baseUrl || '') + anchor;
          },
          /**
           * @param {string} hash
           */
          setHash: function PDFLinkService_setHash(hash) {
            var pageNumber, dest;
            if (hash.indexOf('=') >= 0) {
              var params = parseQueryString(hash);
              if ('search' in params) {
                this.eventBus.dispatch('findfromurlhash', {
                  source: this,
                  query: params['search'].replace(/"/g, ''),
                  phraseSearch: params['phrase'] === 'true'
                });
              }
              // borrowing syntax from "Parameters for Opening PDF Files"
              if ('nameddest' in params) {
                if (this.pdfHistory) {
                  this.pdfHistory.updateNextHashParam(params.nameddest);
                }
                this.navigateTo(params.nameddest);
                return;
              }
              if ('page' in params) {
                pageNumber = params.page | 0 || 1;
              }
              if ('zoom' in params) {
                // Build the destination array.
                var zoomArgs = params.zoom.split(',');
                // scale,left,top
                var zoomArg = zoomArgs[0];
                var zoomArgNumber = parseFloat(zoomArg);
                if (zoomArg.indexOf('Fit') === -1) {
                  // If the zoomArg is a number, it has to get divided by 100. If it's
                  // a string, it should stay as it is.
                  dest = [
                    null,
                    { name: 'XYZ' },
                    zoomArgs.length > 1 ? zoomArgs[1] | 0 : null,
                    zoomArgs.length > 2 ? zoomArgs[2] | 0 : null,
                    zoomArgNumber ? zoomArgNumber / 100 : zoomArg
                  ];
                } else {
                  if (zoomArg === 'Fit' || zoomArg === 'FitB') {
                    dest = [
                      null,
                      { name: zoomArg }
                    ];
                  } else if (zoomArg === 'FitH' || zoomArg === 'FitBH' || (zoomArg === 'FitV' || zoomArg === 'FitBV')) {
                    dest = [
                      null,
                      { name: zoomArg },
                      zoomArgs.length > 1 ? zoomArgs[1] | 0 : null
                    ];
                  } else if (zoomArg === 'FitR') {
                    if (zoomArgs.length !== 5) {
                      console.error('PDFLinkService_setHash: ' + 'Not enough parameters for \'FitR\'.');
                    } else {
                      dest = [
                        null,
                        { name: zoomArg },
                        zoomArgs[1] | 0,
                        zoomArgs[2] | 0,
                        zoomArgs[3] | 0,
                        zoomArgs[4] | 0
                      ];
                    }
                  } else {
                    console.error('PDFLinkService_setHash: \'' + zoomArg + '\' is not a valid zoom value.');
                  }
                }
              }
              if (dest) {
                this.pdfViewer.scrollPageIntoView({
                  pageNumber: pageNumber || this.page,
                  destArray: dest,
                  allowNegativeOffset: true
                });
              } else if (pageNumber) {
                this.page = pageNumber;
              }
              // simple page
              if ('pagemode' in params) {
                this.eventBus.dispatch('pagemode', {
                  source: this,
                  mode: params.pagemode
                });
              }
            } else if (isPageNumber(hash)) {
              // Page number.
              this.page = hash | 0;
            } else {
              // Named (or explicit) destination.
              dest = unescape(hash);
              try {
                dest = JSON.parse(dest);
                if (!(dest instanceof Array)) {
                  // Avoid incorrectly rejecting a valid named destination, such as
                  // e.g. "4.3" or "true", because `JSON.parse` converted its type.
                  dest = dest.toString();
                }
              } catch (ex) {
              }
              if (typeof dest === 'string' || isValidExplicitDestination(dest)) {
                if (this.pdfHistory) {
                  this.pdfHistory.updateNextHashParam(dest);
                }
                this.navigateTo(dest);
                return;
              }
              console.error('PDFLinkService_setHash: \'' + unescape(hash) + '\' is not a valid destination.');
            }
          },
          /**
           * @param {string} action
           */
          executeNamedAction: function PDFLinkService_executeNamedAction(action) {
            // See PDF reference, table 8.45 - Named action
            switch (action) {
            case 'GoBack':
              if (this.pdfHistory) {
                this.pdfHistory.back();
              }
              break;
            case 'GoForward':
              if (this.pdfHistory) {
                this.pdfHistory.forward();
              }
              break;
            case 'NextPage':
              if (this.page < this.pagesCount) {
                this.page++;
              }
              break;
            case 'PrevPage':
              if (this.page > 1) {
                this.page--;
              }
              break;
            case 'LastPage':
              this.page = this.pagesCount;
              break;
            case 'FirstPage':
              this.page = 1;
              break;
            default:
              break;
            }
            // No action according to spec
            this.eventBus.dispatch('namedaction', {
              source: this,
              action: action
            });
          },
          /**
           * @param {number} pageNum - page number.
           * @param {Object} pageRef - reference to the page.
           */
          cachePageRef: function PDFLinkService_cachePageRef(pageNum, pageRef) {
            var refStr = pageRef.num + ' ' + pageRef.gen + ' R';
            this._pagesRefCache[refStr] = pageNum;
          }
        };
        function isValidExplicitDestination(dest) {
          if (!(dest instanceof Array)) {
            return false;
          }
          var destLength = dest.length, allowNull = true;
          if (destLength < 2) {
            return false;
          }
          var page = dest[0];
          if (!(typeof page === 'object' && typeof page.num === 'number' && (page.num | 0) === page.num && typeof page.gen === 'number' && (page.gen | 0) === page.gen) && !(typeof page === 'number' && (page | 0) === page && page >= 0)) {
            return false;
          }
          var zoom = dest[1];
          if (!(typeof zoom === 'object' && typeof zoom.name === 'string')) {
            return false;
          }
          switch (zoom.name) {
          case 'XYZ':
            if (destLength !== 5) {
              return false;
            }
            break;
          case 'Fit':
          case 'FitB':
            return destLength === 2;
          case 'FitH':
          case 'FitBH':
          case 'FitV':
          case 'FitBV':
            if (destLength !== 3) {
              return false;
            }
            break;
          case 'FitR':
            if (destLength !== 6) {
              return false;
            }
            allowNull = false;
            break;
          default:
            return false;
          }
          for (var i = 2; i < destLength; i++) {
            var param = dest[i];
            if (!(typeof param === 'number' || allowNull && param === null)) {
              return false;
            }
          }
          return true;
        }
        return PDFLinkService;
      }();
      var SimpleLinkService = function SimpleLinkServiceClosure() {
        function SimpleLinkService() {
        }
        SimpleLinkService.prototype = {
          /**
           * @returns {number}
           */
          get page() {
            return 0;
          },
          /**
           * @param {number} value
           */
          set page(value) {
          },
          /**
           * @param dest - The PDF destination object.
           */
          navigateTo: function (dest) {
          },
          /**
           * @param dest - The PDF destination object.
           * @returns {string} The hyperlink to the PDF object.
           */
          getDestinationHash: function (dest) {
            return '#';
          },
          /**
           * @param hash - The PDF parameters/hash.
           * @returns {string} The hyperlink to the PDF object.
           */
          getAnchorUrl: function (hash) {
            return '#';
          },
          /**
           * @param {string} hash
           */
          setHash: function (hash) {
          },
          /**
           * @param {string} action
           */
          executeNamedAction: function (action) {
          },
          /**
           * @param {number} pageNum - page number.
           * @param {Object} pageRef - reference to the page.
           */
          cachePageRef: function (pageNum, pageRef) {
          }
        };
        return SimpleLinkService;
      }();
      exports.PDFLinkService = PDFLinkService;
      exports.SimpleLinkService = SimpleLinkService;
    }));
    (function (root, factory) {
      factory(root.pdfjsWebPDFPageView = {}, root.pdfjsWebUIUtils, root.pdfjsWebPDFRenderingQueue, root.pdfjsWebDOMEvents, root.pdfjsWebPDFJS);
    }(this, function (exports, uiUtils, pdfRenderingQueue, domEvents, pdfjsLib) {
      var CSS_UNITS = uiUtils.CSS_UNITS;
      var DEFAULT_SCALE = uiUtils.DEFAULT_SCALE;
      var getOutputScale = uiUtils.getOutputScale;
      var approximateFraction = uiUtils.approximateFraction;
      var roundToDivide = uiUtils.roundToDivide;
      var RenderingStates = pdfRenderingQueue.RenderingStates;
      var TEXT_LAYER_RENDER_DELAY = 200;
      // ms
      /**
       * @typedef {Object} PDFPageViewOptions
       * @property {HTMLDivElement} container - The viewer element.
       * @property {EventBus} eventBus - The application event bus.
       * @property {number} id - The page unique ID (normally its number).
       * @property {number} scale - The page scale display.
       * @property {PageViewport} defaultViewport - The page viewport.
       * @property {PDFRenderingQueue} renderingQueue - The rendering queue object.
       * @property {IPDFTextLayerFactory} textLayerFactory
       * @property {IPDFAnnotationLayerFactory} annotationLayerFactory
       * @property {boolean} enhanceTextSelection - Turns on the text selection
       *   enhancement. The default is `false`.
       * @property {boolean} renderInteractiveForms - Turns on rendering of
       *   interactive form elements. The default is `false`.
       */
      /**
       * @class
       * @implements {IRenderableView}
       */
      var PDFPageView = function PDFPageViewClosure() {
        /**
         * @constructs PDFPageView
         * @param {PDFPageViewOptions} options
         */
        function PDFPageView(options) {
          var container = options.container;
          var id = options.id;
          var scale = options.scale;
          var defaultViewport = options.defaultViewport;
          var renderingQueue = options.renderingQueue;
          var textLayerFactory = options.textLayerFactory;
          var annotationLayerFactory = options.annotationLayerFactory;
          var enhanceTextSelection = options.enhanceTextSelection || false;
          var renderInteractiveForms = options.renderInteractiveForms || false;
          this.id = id;
          this.renderingId = 'page' + id;
          this.rotation = 0;
          this.scale = scale || DEFAULT_SCALE;
          this.viewport = defaultViewport;
          this.pdfPageRotate = defaultViewport.rotation;
          this.hasRestrictedScaling = false;
          this.enhanceTextSelection = enhanceTextSelection;
          this.renderInteractiveForms = renderInteractiveForms;
          this.eventBus = options.eventBus || domEvents.getGlobalEventBus();
          this.renderingQueue = renderingQueue;
          this.textLayerFactory = textLayerFactory;
          this.annotationLayerFactory = annotationLayerFactory;
          this.renderTask = null;
          this.renderingState = RenderingStates.INITIAL;
          this.resume = null;
          this.onBeforeDraw = null;
          this.onAfterDraw = null;
          this.textLayer = null;
          this.zoomLayer = null;
          this.annotationLayer = null;
          var div = document.createElement('div');
          div.id = 'pageContainer' + this.id;
          div.className = 'page';
          div.style.width = Math.floor(this.viewport.width) + 'px';
          div.style.height = Math.floor(this.viewport.height) + 'px';
          div.setAttribute('data-page-number', this.id);
          this.div = div;
          container.appendChild(div);
        }
        PDFPageView.prototype = {
          setPdfPage: function PDFPageView_setPdfPage(pdfPage) {
            this.pdfPage = pdfPage;
            this.pdfPageRotate = pdfPage.rotate;
            var totalRotation = (this.rotation + this.pdfPageRotate) % 360;
            this.viewport = pdfPage.getViewport(this.scale * CSS_UNITS, totalRotation);
            this.stats = pdfPage.stats;
            this.reset();
          },
          destroy: function PDFPageView_destroy() {
            this.zoomLayer = null;
            this.reset();
            if (this.pdfPage) {
              this.pdfPage.cleanup();
            }
          },
          reset: function PDFPageView_reset(keepZoomLayer, keepAnnotations) {
            this.cancelRendering();
            var div = this.div;
            div.style.width = Math.floor(this.viewport.width) + 'px';
            div.style.height = Math.floor(this.viewport.height) + 'px';
            var childNodes = div.childNodes;
            var currentZoomLayerNode = keepZoomLayer && this.zoomLayer || null;
            var currentAnnotationNode = keepAnnotations && this.annotationLayer && this.annotationLayer.div || null;
            for (var i = childNodes.length - 1; i >= 0; i--) {
              var node = childNodes[i];
              if (currentZoomLayerNode === node || currentAnnotationNode === node) {
                continue;
              }
              div.removeChild(node);
            }
            div.removeAttribute('data-loaded');
            if (currentAnnotationNode) {
              // Hide annotationLayer until all elements are resized
              // so they are not displayed on the already-resized page
              this.annotationLayer.hide();
            } else {
              this.annotationLayer = null;
            }
            if (this.canvas && !currentZoomLayerNode) {
              // Zeroing the width and height causes Firefox to release graphics
              // resources immediately, which can greatly reduce memory consumption.
              this.canvas.width = 0;
              this.canvas.height = 0;
              delete this.canvas;
            }
            this.loadingIconDiv = document.createElement('div');
            this.loadingIconDiv.className = 'loadingIcon';
            div.appendChild(this.loadingIconDiv);
          },
          update: function PDFPageView_update(scale, rotation) {
            this.scale = scale || this.scale;
            if (typeof rotation !== 'undefined') {
              this.rotation = rotation;
            }
            var totalRotation = (this.rotation + this.pdfPageRotate) % 360;
            this.viewport = this.viewport.clone({
              scale: this.scale * CSS_UNITS,
              rotation: totalRotation
            });
            var isScalingRestricted = false;
            if (this.canvas && pdfjsLib.PDFJS.maxCanvasPixels > 0) {
              var outputScale = this.outputScale;
              if ((Math.floor(this.viewport.width) * outputScale.sx | 0) * (Math.floor(this.viewport.height) * outputScale.sy | 0) > pdfjsLib.PDFJS.maxCanvasPixels) {
                isScalingRestricted = true;
              }
            }
            if (this.canvas) {
              if (pdfjsLib.PDFJS.useOnlyCssZoom || this.hasRestrictedScaling && isScalingRestricted) {
                this.cssTransform(this.canvas, true);
                this.eventBus.dispatch('pagerendered', {
                  source: this,
                  pageNumber: this.id,
                  cssTransform: true
                });
                return;
              }
              if (!this.zoomLayer) {
                this.zoomLayer = this.canvas.parentNode;
                this.zoomLayer.style.position = 'absolute';
              }
            }
            if (this.zoomLayer) {
              this.cssTransform(this.zoomLayer.firstChild);
            }
            this.reset(/* keepZoomLayer = */
            true, /* keepAnnotations = */
            true);
          },
          cancelRendering: function PDFPageView_cancelRendering() {
            if (this.renderTask) {
              this.renderTask.cancel();
              this.renderTask = null;
            }
            this.renderingState = RenderingStates.INITIAL;
            this.resume = null;
            if (this.textLayer) {
              this.textLayer.cancel();
              this.textLayer = null;
            }
          },
          /**
           * Called when moved in the parent's container.
           */
          updatePosition: function PDFPageView_updatePosition() {
            if (this.textLayer) {
              this.textLayer.render(TEXT_LAYER_RENDER_DELAY);
            }
          },
          cssTransform: function PDFPageView_transform(canvas, redrawAnnotations) {
            var CustomStyle = pdfjsLib.CustomStyle;
            // Scale canvas, canvas wrapper, and page container.
            var width = this.viewport.width;
            var height = this.viewport.height;
            var div = this.div;
            canvas.style.width = canvas.parentNode.style.width = div.style.width = Math.floor(width) + 'px';
            canvas.style.height = canvas.parentNode.style.height = div.style.height = Math.floor(height) + 'px';
            // The canvas may have been originally rotated, rotate relative to that.
            var relativeRotation = this.viewport.rotation - canvas._viewport.rotation;
            var absRotation = Math.abs(relativeRotation);
            var scaleX = 1, scaleY = 1;
            if (absRotation === 90 || absRotation === 270) {
              // Scale x and y because of the rotation.
              scaleX = height / width;
              scaleY = width / height;
            }
            var cssTransform = 'rotate(' + relativeRotation + 'deg) ' + 'scale(' + scaleX + ',' + scaleY + ')';
            CustomStyle.setProp('transform', canvas, cssTransform);
            if (this.textLayer) {
              // Rotating the text layer is more complicated since the divs inside the
              // the text layer are rotated.
              // TODO: This could probably be simplified by drawing the text layer in
              // one orientation then rotating overall.
              var textLayerViewport = this.textLayer.viewport;
              var textRelativeRotation = this.viewport.rotation - textLayerViewport.rotation;
              var textAbsRotation = Math.abs(textRelativeRotation);
              var scale = width / textLayerViewport.width;
              if (textAbsRotation === 90 || textAbsRotation === 270) {
                scale = width / textLayerViewport.height;
              }
              var textLayerDiv = this.textLayer.textLayerDiv;
              var transX, transY;
              switch (textAbsRotation) {
              case 0:
                transX = transY = 0;
                break;
              case 90:
                transX = 0;
                transY = '-' + textLayerDiv.style.height;
                break;
              case 180:
                transX = '-' + textLayerDiv.style.width;
                transY = '-' + textLayerDiv.style.height;
                break;
              case 270:
                transX = '-' + textLayerDiv.style.width;
                transY = 0;
                break;
              default:
                console.error('Bad rotation value.');
                break;
              }
              CustomStyle.setProp('transform', textLayerDiv, 'rotate(' + textAbsRotation + 'deg) ' + 'scale(' + scale + ', ' + scale + ') ' + 'translate(' + transX + ', ' + transY + ')');
              CustomStyle.setProp('transformOrigin', textLayerDiv, '0% 0%');
            }
            if (redrawAnnotations && this.annotationLayer) {
              this.annotationLayer.render(this.viewport, 'display');
            }
          },
          get width() {
            return this.viewport.width;
          },
          get height() {
            return this.viewport.height;
          },
          getPagePoint: function PDFPageView_getPagePoint(x, y) {
            return this.viewport.convertToPdfPoint(x, y);
          },
          draw: function PDFPageView_draw() {
            if (this.renderingState !== RenderingStates.INITIAL) {
              console.error('Must be in new state before drawing');
              this.reset();
            }
            // Ensure that we reset all state to prevent issues.
            this.renderingState = RenderingStates.RUNNING;
            var pdfPage = this.pdfPage;
            var viewport = this.viewport;
            var div = this.div;
            // Wrap the canvas so if it has a css transform for highdpi the overflow
            // will be hidden in FF.
            var canvasWrapper = document.createElement('div');
            canvasWrapper.style.width = div.style.width;
            canvasWrapper.style.height = div.style.height;
            canvasWrapper.classList.add('canvasWrapper');
            var canvas = document.createElement('canvas');
            canvas.id = 'page' + this.id;
            // Keep the canvas hidden until the first draw callback, or until drawing
            // is complete when `!this.renderingQueue`, to prevent black flickering.
            canvas.setAttribute('hidden', 'hidden');
            var isCanvasHidden = true;
            canvasWrapper.appendChild(canvas);
            if (this.annotationLayer && this.annotationLayer.div) {
              // annotationLayer needs to stay on top
              div.insertBefore(canvasWrapper, this.annotationLayer.div);
            } else {
              div.appendChild(canvasWrapper);
            }
            this.canvas = canvas;
            canvas.mozOpaque = true;
            var ctx = canvas.getContext('2d', { alpha: false });
            var outputScale = getOutputScale(ctx);
            this.outputScale = outputScale;
            if (pdfjsLib.PDFJS.useOnlyCssZoom) {
              var actualSizeViewport = viewport.clone({ scale: CSS_UNITS });
              // Use a scale that will make the canvas be the original intended size
              // of the page.
              outputScale.sx *= actualSizeViewport.width / viewport.width;
              outputScale.sy *= actualSizeViewport.height / viewport.height;
              outputScale.scaled = true;
            }
            if (pdfjsLib.PDFJS.maxCanvasPixels > 0) {
              var pixelsInViewport = viewport.width * viewport.height;
              var maxScale = Math.sqrt(pdfjsLib.PDFJS.maxCanvasPixels / pixelsInViewport);
              if (outputScale.sx > maxScale || outputScale.sy > maxScale) {
                outputScale.sx = maxScale;
                outputScale.sy = maxScale;
                outputScale.scaled = true;
                this.hasRestrictedScaling = true;
              } else {
                this.hasRestrictedScaling = false;
              }
            }
            var sfx = approximateFraction(outputScale.sx);
            var sfy = approximateFraction(outputScale.sy);
            canvas.width = roundToDivide(viewport.width * outputScale.sx, sfx[0]);
            canvas.height = roundToDivide(viewport.height * outputScale.sy, sfy[0]);
            canvas.style.width = roundToDivide(viewport.width, sfx[1]) + 'px';
            canvas.style.height = roundToDivide(viewport.height, sfy[1]) + 'px';
            // Add the viewport so it's known what it was originally drawn with.
            canvas._viewport = viewport;
            var textLayerDiv = null;
            var textLayer = null;
            if (this.textLayerFactory) {
              textLayerDiv = document.createElement('div');
              textLayerDiv.className = 'textLayer';
              textLayerDiv.style.width = canvasWrapper.style.width;
              textLayerDiv.style.height = canvasWrapper.style.height;
              if (this.annotationLayer && this.annotationLayer.div) {
                // annotationLayer needs to stay on top
                div.insertBefore(textLayerDiv, this.annotationLayer.div);
              } else {
                div.appendChild(textLayerDiv);
              }
              textLayer = this.textLayerFactory.createTextLayerBuilder(textLayerDiv, this.id - 1, this.viewport, this.enhanceTextSelection);
            }
            this.textLayer = textLayer;
            var resolveRenderPromise, rejectRenderPromise;
            var promise = new Promise(function (resolve, reject) {
              resolveRenderPromise = resolve;
              rejectRenderPromise = reject;
            });
            // Rendering area
            var self = this;
            function pageViewDrawCallback(error) {
              // The renderTask may have been replaced by a new one, so only remove
              // the reference to the renderTask if it matches the one that is
              // triggering this callback.
              if (renderTask === self.renderTask) {
                self.renderTask = null;
              }
              if (error === 'cancelled') {
                rejectRenderPromise(error);
                return;
              }
              self.renderingState = RenderingStates.FINISHED;
              if (isCanvasHidden) {
                self.canvas.removeAttribute('hidden');
                isCanvasHidden = false;
              }
              if (self.loadingIconDiv) {
                div.removeChild(self.loadingIconDiv);
                delete self.loadingIconDiv;
              }
              if (self.zoomLayer) {
                // Zeroing the width and height causes Firefox to release graphics
                // resources immediately, which can greatly reduce memory consumption.
                var zoomLayerCanvas = self.zoomLayer.firstChild;
                zoomLayerCanvas.width = 0;
                zoomLayerCanvas.height = 0;
                if (div.contains(self.zoomLayer)) {
                  // Prevent "Node was not found" errors if the `zoomLayer` was
                  // already removed. This may occur intermittently if the scale
                  // changes many times in very quick succession.
                  div.removeChild(self.zoomLayer);
                }
                self.zoomLayer = null;
              }
              self.error = error;
              self.stats = pdfPage.stats;
              if (self.onAfterDraw) {
                self.onAfterDraw();
              }
              self.eventBus.dispatch('pagerendered', {
                source: self,
                pageNumber: self.id,
                cssTransform: false
              });
              if (!error) {
                resolveRenderPromise(undefined);
              } else {
                rejectRenderPromise(error);
              }
            }
            var renderContinueCallback = null;
            if (this.renderingQueue) {
              renderContinueCallback = function renderContinueCallback(cont) {
                if (!self.renderingQueue.isHighestPriority(self)) {
                  self.renderingState = RenderingStates.PAUSED;
                  self.resume = function resumeCallback() {
                    self.renderingState = RenderingStates.RUNNING;
                    cont();
                  };
                  return;
                }
                if (isCanvasHidden) {
                  self.canvas.removeAttribute('hidden');
                  isCanvasHidden = false;
                }
                cont();
              };
            }
            var transform = !outputScale.scaled ? null : [
              outputScale.sx,
              0,
              0,
              outputScale.sy,
              0,
              0
            ];
            var renderContext = {
              canvasContext: ctx,
              transform: transform,
              viewport: this.viewport,
              renderInteractiveForms: this.renderInteractiveForms
            };
            // intent: 'default', // === 'display'
            var renderTask = this.renderTask = this.pdfPage.render(renderContext);
            renderTask.onContinue = renderContinueCallback;
            this.renderTask.promise.then(function pdfPageRenderCallback() {
              pageViewDrawCallback(null);
              if (textLayer) {
                self.pdfPage.getTextContent({ normalizeWhitespace: true }).then(function textContentResolved(textContent) {
                  textLayer.setTextContent(textContent);
                  textLayer.render(TEXT_LAYER_RENDER_DELAY);
                });
              }
            }, function pdfPageRenderError(error) {
              pageViewDrawCallback(error);
            });
            if (this.annotationLayerFactory) {
              if (!this.annotationLayer) {
                this.annotationLayer = this.annotationLayerFactory.createAnnotationLayerBuilder(div, this.pdfPage, this.renderInteractiveForms);
              }
              this.annotationLayer.render(this.viewport, 'display');
            }
            div.setAttribute('data-loaded', true);
            if (self.onBeforeDraw) {
              self.onBeforeDraw();
            }
            return promise;
          }
        };
        return PDFPageView;
      }();
      exports.PDFPageView = PDFPageView;
    }));
    (function (root, factory) {
      factory(root.pdfjsWebTextLayerBuilder = {}, root.pdfjsWebDOMEvents, root.pdfjsWebPDFJS);
    }(this, function (exports, domEvents, pdfjsLib) {
      var EXPAND_DIVS_TIMEOUT = 300;
      // ms
      /**
       * @typedef {Object} TextLayerBuilderOptions
       * @property {HTMLDivElement} textLayerDiv - The text layer container.
       * @property {EventBus} eventBus - The application event bus.
       * @property {number} pageIndex - The page index.
       * @property {PageViewport} viewport - The viewport of the text layer.
       * @property {PDFFindController} findController
       * @property {boolean} enhanceTextSelection - Option to turn on improved
       *   text selection.
       */
      /**
       * TextLayerBuilder provides text-selection functionality for the PDF.
       * It does this by creating overlay divs over the PDF text. These divs
       * contain text that matches the PDF text they are overlaying. This object
       * also provides a way to highlight text that is being searched for.
       * @class
       */
      var TextLayerBuilder = function TextLayerBuilderClosure() {
        function TextLayerBuilder(options) {
          this.textLayerDiv = options.textLayerDiv;
          this.eventBus = options.eventBus || domEvents.getGlobalEventBus();
          this.textContent = null;
          this.renderingDone = false;
          this.pageIdx = options.pageIndex;
          this.pageNumber = this.pageIdx + 1;
          this.matches = [];
          this.viewport = options.viewport;
          this.textDivs = [];
          this.findController = options.findController || null;
          this.textLayerRenderTask = null;
          this.enhanceTextSelection = options.enhanceTextSelection;
          this._bindMouse();
        }
        TextLayerBuilder.prototype = {
          /**
           * @private
           */
          _finishRendering: function TextLayerBuilder_finishRendering() {
            this.renderingDone = true;
            if (!this.enhanceTextSelection) {
              var endOfContent = document.createElement('div');
              endOfContent.className = 'endOfContent';
              this.textLayerDiv.appendChild(endOfContent);
            }
            this.eventBus.dispatch('textlayerrendered', {
              source: this,
              pageNumber: this.pageNumber,
              numTextDivs: this.textDivs.length
            });
          },
          /**
           * Renders the text layer.
           * @param {number} timeout (optional) if specified, the rendering waits
           *   for specified amount of ms.
           */
          render: function TextLayerBuilder_render(timeout) {
            if (!this.textContent || this.renderingDone) {
              return;
            }
            this.cancel();
            this.textDivs = [];
            var textLayerFrag = document.createDocumentFragment();
            this.textLayerRenderTask = pdfjsLib.renderTextLayer({
              textContent: this.textContent,
              container: textLayerFrag,
              viewport: this.viewport,
              textDivs: this.textDivs,
              timeout: timeout,
              enhanceTextSelection: this.enhanceTextSelection
            });
            this.textLayerRenderTask.promise.then(function () {
              this.textLayerDiv.appendChild(textLayerFrag);
              this._finishRendering();
              this.updateMatches();
            }.bind(this), function (reason) {
            });
          },
          /**
           * Cancels rendering of the text layer.
           */
          cancel: function TextLayerBuilder_cancel() {
            if (this.textLayerRenderTask) {
              this.textLayerRenderTask.cancel();
              this.textLayerRenderTask = null;
            }
          },
          setTextContent: function TextLayerBuilder_setTextContent(textContent) {
            this.cancel();
            this.textContent = textContent;
          },
          convertMatches: function TextLayerBuilder_convertMatches(matches, matchesLength) {
            var i = 0;
            var iIndex = 0;
            var bidiTexts = this.textContent.items;
            var end = bidiTexts.length - 1;
            var queryLen = this.findController === null ? 0 : this.findController.state.query.length;
            var ret = [];
            if (!matches) {
              return ret;
            }
            for (var m = 0, len = matches.length; m < len; m++) {
              // Calculate the start position.
              var matchIdx = matches[m];
              // Loop over the divIdxs.
              while (i !== end && matchIdx >= iIndex + bidiTexts[i].str.length) {
                iIndex += bidiTexts[i].str.length;
                i++;
              }
              if (i === bidiTexts.length) {
                console.error('Could not find a matching mapping');
              }
              var match = {
                begin: {
                  divIdx: i,
                  offset: matchIdx - iIndex
                }
              };
              // Calculate the end position.
              if (matchesLength) {
                // multiterm search
                matchIdx += matchesLength[m];
              } else {
                // phrase search
                matchIdx += queryLen;
              }
              // Somewhat the same array as above, but use > instead of >= to get
              // the end position right.
              while (i !== end && matchIdx > iIndex + bidiTexts[i].str.length) {
                iIndex += bidiTexts[i].str.length;
                i++;
              }
              match.end = {
                divIdx: i,
                offset: matchIdx - iIndex
              };
              ret.push(match);
            }
            return ret;
          },
          renderMatches: function TextLayerBuilder_renderMatches(matches) {
            // Early exit if there is nothing to render.
            if (matches.length === 0) {
              return;
            }
            var bidiTexts = this.textContent.items;
            var textDivs = this.textDivs;
            var prevEnd = null;
            var pageIdx = this.pageIdx;
            var isSelectedPage = this.findController === null ? false : pageIdx === this.findController.selected.pageIdx;
            var selectedMatchIdx = this.findController === null ? -1 : this.findController.selected.matchIdx;
            var highlightAll = this.findController === null ? false : this.findController.state.highlightAll;
            var infinity = {
              divIdx: -1,
              offset: undefined
            };
            function beginText(begin, className) {
              var divIdx = begin.divIdx;
              textDivs[divIdx].textContent = '';
              appendTextToDiv(divIdx, 0, begin.offset, className);
            }
            function appendTextToDiv(divIdx, fromOffset, toOffset, className) {
              var div = textDivs[divIdx];
              var content = bidiTexts[divIdx].str.substring(fromOffset, toOffset);
              var node = document.createTextNode(content);
              if (className) {
                var span = document.createElement('span');
                span.className = className;
                span.appendChild(node);
                div.appendChild(span);
                return;
              }
              div.appendChild(node);
            }
            var i0 = selectedMatchIdx, i1 = i0 + 1;
            if (highlightAll) {
              i0 = 0;
              i1 = matches.length;
            } else if (!isSelectedPage) {
              // Not highlighting all and this isn't the selected page, so do nothing.
              return;
            }
            for (var i = i0; i < i1; i++) {
              var match = matches[i];
              var begin = match.begin;
              var end = match.end;
              var isSelected = isSelectedPage && i === selectedMatchIdx;
              var highlightSuffix = isSelected ? ' selected' : '';
              if (this.findController) {
                this.findController.updateMatchPosition(pageIdx, i, textDivs, begin.divIdx);
              }
              // Match inside new div.
              if (!prevEnd || begin.divIdx !== prevEnd.divIdx) {
                // If there was a previous div, then add the text at the end.
                if (prevEnd !== null) {
                  appendTextToDiv(prevEnd.divIdx, prevEnd.offset, infinity.offset);
                }
                // Clear the divs and set the content until the starting point.
                beginText(begin);
              } else {
                appendTextToDiv(prevEnd.divIdx, prevEnd.offset, begin.offset);
              }
              if (begin.divIdx === end.divIdx) {
                appendTextToDiv(begin.divIdx, begin.offset, end.offset, 'highlight' + highlightSuffix);
              } else {
                appendTextToDiv(begin.divIdx, begin.offset, infinity.offset, 'highlight begin' + highlightSuffix);
                for (var n0 = begin.divIdx + 1, n1 = end.divIdx; n0 < n1; n0++) {
                  textDivs[n0].className = 'highlight middle' + highlightSuffix;
                }
                beginText(end, 'highlight end' + highlightSuffix);
              }
              prevEnd = end;
            }
            if (prevEnd) {
              appendTextToDiv(prevEnd.divIdx, prevEnd.offset, infinity.offset);
            }
          },
          updateMatches: function TextLayerBuilder_updateMatches() {
            // Only show matches when all rendering is done.
            if (!this.renderingDone) {
              return;
            }
            // Clear all matches.
            var matches = this.matches;
            var textDivs = this.textDivs;
            var bidiTexts = this.textContent.items;
            var clearedUntilDivIdx = -1;
            // Clear all current matches.
            for (var i = 0, len = matches.length; i < len; i++) {
              var match = matches[i];
              var begin = Math.max(clearedUntilDivIdx, match.begin.divIdx);
              for (var n = begin, end = match.end.divIdx; n <= end; n++) {
                var div = textDivs[n];
                div.textContent = bidiTexts[n].str;
                div.className = '';
              }
              clearedUntilDivIdx = match.end.divIdx + 1;
            }
            if (this.findController === null || !this.findController.active) {
              return;
            }
            // Convert the matches on the page controller into the match format
            // used for the textLayer.
            var pageMatches, pageMatchesLength;
            if (this.findController !== null) {
              pageMatches = this.findController.pageMatches[this.pageIdx] || null;
              pageMatchesLength = this.findController.pageMatchesLength ? this.findController.pageMatchesLength[this.pageIdx] || null : null;
            }
            this.matches = this.convertMatches(pageMatches, pageMatchesLength);
            this.renderMatches(this.matches);
          },
          /**
           * Fixes text selection: adds additional div where mouse was clicked.
           * This reduces flickering of the content if mouse slowly dragged down/up.
           * @private
           */
          _bindMouse: function TextLayerBuilder_bindMouse() {
            var div = this.textLayerDiv;
            var self = this;
            var expandDivsTimer = null;
            div.addEventListener('mousedown', function (e) {
              if (self.enhanceTextSelection && self.textLayerRenderTask) {
                self.textLayerRenderTask.expandTextDivs(true);
                if (expandDivsTimer) {
                  clearTimeout(expandDivsTimer);
                  expandDivsTimer = null;
                }
                return;
              }
              var end = div.querySelector('.endOfContent');
              if (!end) {
                return;
              }
              // On non-Firefox browsers, the selection will feel better if the height
              // of the endOfContent div will be adjusted to start at mouse click
              // location -- this will avoid flickering when selections moves up.
              // However it does not work when selection started on empty space.
              var adjustTop = e.target !== div;
              adjustTop = adjustTop && window.getComputedStyle(end).getPropertyValue('-moz-user-select') !== 'none';
              if (adjustTop) {
                var divBounds = div.getBoundingClientRect();
                var r = Math.max(0, (e.pageY - divBounds.top) / divBounds.height);
                end.style.top = (r * 100).toFixed(2) + '%';
              }
              end.classList.add('active');
            });
            div.addEventListener('mouseup', function (e) {
              if (self.enhanceTextSelection && self.textLayerRenderTask) {
                expandDivsTimer = setTimeout(function () {
                  if (self.textLayerRenderTask) {
                    self.textLayerRenderTask.expandTextDivs(false);
                  }
                  expandDivsTimer = null;
                }, EXPAND_DIVS_TIMEOUT);
                return;
              }
              var end = div.querySelector('.endOfContent');
              if (!end) {
                return;
              }
              end.style.top = '';
              end.classList.remove('active');
            });
          }
        };
        return TextLayerBuilder;
      }();
      /**
       * @constructor
       * @implements IPDFTextLayerFactory
       */
      function DefaultTextLayerFactory() {
      }
      DefaultTextLayerFactory.prototype = {
        /**
         * @param {HTMLDivElement} textLayerDiv
         * @param {number} pageIndex
         * @param {PageViewport} viewport
         * @param {boolean} enhanceTextSelection
         * @returns {TextLayerBuilder}
         */
        createTextLayerBuilder: function (textLayerDiv, pageIndex, viewport, enhanceTextSelection) {
          return new TextLayerBuilder({
            textLayerDiv: textLayerDiv,
            pageIndex: pageIndex,
            viewport: viewport,
            enhanceTextSelection: enhanceTextSelection
          });
        }
      };
      exports.TextLayerBuilder = TextLayerBuilder;
      exports.DefaultTextLayerFactory = DefaultTextLayerFactory;
    }));
    (function (root, factory) {
      factory(root.pdfjsWebAnnotationLayerBuilder = {}, root.pdfjsWebUIUtils, root.pdfjsWebPDFLinkService, root.pdfjsWebPDFJS);
    }(this, function (exports, uiUtils, pdfLinkService, pdfjsLib) {
      var mozL10n = uiUtils.mozL10n;
      var SimpleLinkService = pdfLinkService.SimpleLinkService;
      /**
       * @typedef {Object} AnnotationLayerBuilderOptions
       * @property {HTMLDivElement} pageDiv
       * @property {PDFPage} pdfPage
       * @property {boolean} renderInteractiveForms
       * @property {IPDFLinkService} linkService
       * @property {DownloadManager} downloadManager
       */
      /**
       * @class
       */
      var AnnotationLayerBuilder = function AnnotationLayerBuilderClosure() {
        /**
         * @param {AnnotationLayerBuilderOptions} options
         * @constructs AnnotationLayerBuilder
         */
        function AnnotationLayerBuilder(options) {
          this.pageDiv = options.pageDiv;
          this.pdfPage = options.pdfPage;
          this.renderInteractiveForms = options.renderInteractiveForms;
          this.linkService = options.linkService;
          this.downloadManager = options.downloadManager;
          this.div = null;
        }
        AnnotationLayerBuilder.prototype = /** @lends AnnotationLayerBuilder.prototype */
        {
          /**
           * @param {PageViewport} viewport
           * @param {string} intent (default value is 'display')
           */
          render: function AnnotationLayerBuilder_render(viewport, intent) {
            var self = this;
            var parameters = { intent: intent === undefined ? 'display' : intent };
            this.pdfPage.getAnnotations(parameters).then(function (annotations) {
              viewport = viewport.clone({ dontFlip: true });
              parameters = {
                viewport: viewport,
                div: self.div,
                annotations: annotations,
                page: self.pdfPage,
                renderInteractiveForms: self.renderInteractiveForms,
                linkService: self.linkService,
                downloadManager: self.downloadManager
              };
              if (self.div) {
                // If an annotationLayer already exists, refresh its children's
                // transformation matrices.
                pdfjsLib.AnnotationLayer.update(parameters);
              } else {
                // Create an annotation layer div and render the annotations
                // if there is at least one annotation.
                if (annotations.length === 0) {
                  return;
                }
                self.div = document.createElement('div');
                self.div.className = 'annotationLayer';
                self.pageDiv.appendChild(self.div);
                parameters.div = self.div;
                pdfjsLib.AnnotationLayer.render(parameters);
                if (typeof mozL10n !== 'undefined') {
                  mozL10n.translate(self.div);
                }
              }
            });
          },
          hide: function AnnotationLayerBuilder_hide() {
            if (!this.div) {
              return;
            }
            this.div.setAttribute('hidden', 'true');
          }
        };
        return AnnotationLayerBuilder;
      }();
      /**
       * @constructor
       * @implements IPDFAnnotationLayerFactory
       */
      function DefaultAnnotationLayerFactory() {
      }
      DefaultAnnotationLayerFactory.prototype = {
        /**
         * @param {HTMLDivElement} pageDiv
         * @param {PDFPage} pdfPage
         * @param {boolean} renderInteractiveForms
         * @returns {AnnotationLayerBuilder}
         */
        createAnnotationLayerBuilder: function (pageDiv, pdfPage, renderInteractiveForms) {
          return new AnnotationLayerBuilder({
            pageDiv: pageDiv,
            pdfPage: pdfPage,
            renderInteractiveForms: renderInteractiveForms,
            linkService: new SimpleLinkService()
          });
        }
      };
      exports.AnnotationLayerBuilder = AnnotationLayerBuilder;
      exports.DefaultAnnotationLayerFactory = DefaultAnnotationLayerFactory;
    }));
    (function (root, factory) {
      factory(root.pdfjsWebPDFViewer = {}, root.pdfjsWebUIUtils, root.pdfjsWebPDFPageView, root.pdfjsWebPDFRenderingQueue, root.pdfjsWebTextLayerBuilder, root.pdfjsWebAnnotationLayerBuilder, root.pdfjsWebPDFLinkService, root.pdfjsWebDOMEvents, root.pdfjsWebPDFJS);
    }(this, function (exports, uiUtils, pdfPageView, pdfRenderingQueue, textLayerBuilder, annotationLayerBuilder, pdfLinkService, domEvents, pdfjsLib) {
      var UNKNOWN_SCALE = uiUtils.UNKNOWN_SCALE;
      var SCROLLBAR_PADDING = uiUtils.SCROLLBAR_PADDING;
      var VERTICAL_PADDING = uiUtils.VERTICAL_PADDING;
      var MAX_AUTO_SCALE = uiUtils.MAX_AUTO_SCALE;
      var CSS_UNITS = uiUtils.CSS_UNITS;
      var DEFAULT_SCALE = uiUtils.DEFAULT_SCALE;
      var DEFAULT_SCALE_VALUE = uiUtils.DEFAULT_SCALE_VALUE;
      var scrollIntoView = uiUtils.scrollIntoView;
      var watchScroll = uiUtils.watchScroll;
      var getVisibleElements = uiUtils.getVisibleElements;
      var PDFPageView = pdfPageView.PDFPageView;
      var RenderingStates = pdfRenderingQueue.RenderingStates;
      var PDFRenderingQueue = pdfRenderingQueue.PDFRenderingQueue;
      var TextLayerBuilder = textLayerBuilder.TextLayerBuilder;
      var AnnotationLayerBuilder = annotationLayerBuilder.AnnotationLayerBuilder;
      var SimpleLinkService = pdfLinkService.SimpleLinkService;
      var PresentationModeState = {
        UNKNOWN: 0,
        NORMAL: 1,
        CHANGING: 2,
        FULLSCREEN: 3
      };
      var DEFAULT_CACHE_SIZE = 10;
      /**
       * @typedef {Object} PDFViewerOptions
       * @property {HTMLDivElement} container - The container for the viewer element.
       * @property {HTMLDivElement} viewer - (optional) The viewer element.
       * @property {EventBus} eventBus - The application event bus.
       * @property {IPDFLinkService} linkService - The navigation/linking service.
       * @property {DownloadManager} downloadManager - (optional) The download
       *   manager component.
       * @property {PDFRenderingQueue} renderingQueue - (optional) The rendering
       *   queue object.
       * @property {boolean} removePageBorders - (optional) Removes the border shadow
       *   around the pages. The default is false.
       * @property {boolean} enhanceTextSelection - (optional) Enables the improved
       *   text selection behaviour. The default is `false`.
       * @property {boolean} renderInteractiveForms - (optional) Enables rendering of
       *   interactive form elements. The default is `false`.
       */
      /**
       * Simple viewer control to display PDF content/pages.
       * @class
       * @implements {IRenderableView}
       */
      var PDFViewer = function pdfViewer() {
        function PDFPageViewBuffer(size) {
          var data = [];
          this.push = function cachePush(view) {
            var i = data.indexOf(view);
            if (i >= 0) {
              data.splice(i, 1);
            }
            data.push(view);
            if (data.length > size) {
              data.shift().destroy();
            }
          };
          this.resize = function (newSize) {
            size = newSize;
            while (data.length > size) {
              data.shift().destroy();
            }
          };
        }
        function isSameScale(oldScale, newScale) {
          if (newScale === oldScale) {
            return true;
          }
          if (Math.abs(newScale - oldScale) < 1e-15) {
            // Prevent unnecessary re-rendering of all pages when the scale
            // changes only because of limited numerical precision.
            return true;
          }
          return false;
        }
        /**
         * @constructs PDFViewer
         * @param {PDFViewerOptions} options
         */
        function PDFViewer(options) {
          this.container = options.container;
          this.viewer = options.viewer || options.container.firstElementChild;
          this.eventBus = options.eventBus || domEvents.getGlobalEventBus();
          this.linkService = options.linkService || new SimpleLinkService();
          this.downloadManager = options.downloadManager || null;
          this.removePageBorders = options.removePageBorders || false;
          this.enhanceTextSelection = options.enhanceTextSelection || false;
          this.renderInteractiveForms = options.renderInteractiveForms || false;
          this.defaultRenderingQueue = !options.renderingQueue;
          if (this.defaultRenderingQueue) {
            // Custom rendering queue is not specified, using default one
            this.renderingQueue = new PDFRenderingQueue();
            this.renderingQueue.setViewer(this);
          } else {
            this.renderingQueue = options.renderingQueue;
          }
          this.scroll = watchScroll(this.container, this._scrollUpdate.bind(this));
          this.presentationModeState = PresentationModeState.UNKNOWN;
          this._resetView();
          if (this.removePageBorders) {
            this.viewer.classList.add('removePageBorders');
          }
        }
        PDFViewer.prototype = /** @lends PDFViewer.prototype */
        {
          get pagesCount() {
            return this._pages.length;
          },
          getPageView: function (index) {
            return this._pages[index];
          },
          /**
           * @returns {boolean} true if all {PDFPageView} objects are initialized.
           */
          get pageViewsReady() {
            return this._pageViewsReady;
          },
          /**
           * @returns {number}
           */
          get currentPageNumber() {
            return this._currentPageNumber;
          },
          /**
           * @param {number} val - The page number.
           */
          set currentPageNumber(val) {
            if ((val | 0) !== val) {
              // Ensure that `val` is an integer.
              throw new Error('Invalid page number.');
            }
            if (!this.pdfDocument) {
              this._currentPageNumber = val;
              return;
            }
            // The intent can be to just reset a scroll position and/or scale.
            this._setCurrentPageNumber(val, /* resetCurrentPageView = */
            true);
          },
          /**
           * @private
           */
          _setCurrentPageNumber: function PDFViewer_setCurrentPageNumber(val, resetCurrentPageView) {
            if (this._currentPageNumber === val) {
              if (resetCurrentPageView) {
                this._resetCurrentPageView();
              }
              return;
            }
            if (!(0 < val && val <= this.pagesCount)) {
              console.error('PDFViewer_setCurrentPageNumber: "' + val + '" is out of bounds.');
              return;
            }
            var arg = {
              source: this,
              pageNumber: val
            };
            this._currentPageNumber = val;
            this.eventBus.dispatch('pagechanging', arg);
            this.eventBus.dispatch('pagechange', arg);
            if (resetCurrentPageView) {
              this._resetCurrentPageView();
            }
          },
          /**
           * @returns {number}
           */
          get currentScale() {
            return this._currentScale !== UNKNOWN_SCALE ? this._currentScale : DEFAULT_SCALE;
          },
          /**
           * @param {number} val - Scale of the pages in percents.
           */
          set currentScale(val) {
            if (isNaN(val)) {
              throw new Error('Invalid numeric scale');
            }
            if (!this.pdfDocument) {
              this._currentScale = val;
              this._currentScaleValue = val !== UNKNOWN_SCALE ? val.toString() : null;
              return;
            }
            this._setScale(val, false);
          },
          /**
           * @returns {string}
           */
          get currentScaleValue() {
            return this._currentScaleValue;
          },
          /**
           * @param val - The scale of the pages (in percent or predefined value).
           */
          set currentScaleValue(val) {
            if (!this.pdfDocument) {
              this._currentScale = isNaN(val) ? UNKNOWN_SCALE : val;
              this._currentScaleValue = val.toString();
              return;
            }
            this._setScale(val, false);
          },
          /**
           * @returns {number}
           */
          get pagesRotation() {
            return this._pagesRotation;
          },
          /**
           * @param {number} rotation - The rotation of the pages (0, 90, 180, 270).
           */
          set pagesRotation(rotation) {
            if (!(typeof rotation === 'number' && rotation % 90 === 0)) {
              throw new Error('Invalid pages rotation angle.');
            }
            this._pagesRotation = rotation;
            if (!this.pdfDocument) {
              return;
            }
            for (var i = 0, l = this._pages.length; i < l; i++) {
              var pageView = this._pages[i];
              pageView.update(pageView.scale, rotation);
            }
            this._setScale(this._currentScaleValue, true);
            if (this.defaultRenderingQueue) {
              this.update();
            }
          },
          /**
           * @param pdfDocument {PDFDocument}
           */
          setDocument: function (pdfDocument) {
            if (this.pdfDocument) {
              this._cancelRendering();
              this._resetView();
            }
            this.pdfDocument = pdfDocument;
            if (!pdfDocument) {
              return;
            }
            var pagesCount = pdfDocument.numPages;
            var self = this;
            var resolvePagesPromise;
            var pagesPromise = new Promise(function (resolve) {
              resolvePagesPromise = resolve;
            });
            this.pagesPromise = pagesPromise;
            pagesPromise.then(function () {
              self._pageViewsReady = true;
              self.eventBus.dispatch('pagesloaded', {
                source: self,
                pagesCount: pagesCount
              });
            });
            var isOnePageRenderedResolved = false;
            var resolveOnePageRendered = null;
            var onePageRendered = new Promise(function (resolve) {
              resolveOnePageRendered = resolve;
            });
            this.onePageRendered = onePageRendered;
            var bindOnAfterAndBeforeDraw = function (pageView) {
              pageView.onBeforeDraw = function pdfViewLoadOnBeforeDraw() {
                // Add the page to the buffer at the start of drawing. That way it can
                // be evicted from the buffer and destroyed even if we pause its
                // rendering.
                self._buffer.push(this);
              };
              pageView.onAfterDraw = function pdfViewLoadOnAfterDraw() {
                if (!isOnePageRenderedResolved) {
                  isOnePageRenderedResolved = true;
                  resolveOnePageRendered();
                }
              };
            };
            var firstPagePromise = pdfDocument.getPage(1);
            this.firstPagePromise = firstPagePromise;
            // Fetch a single page so we can get a viewport that will be the default
            // viewport for all pages
            return firstPagePromise.then(function (pdfPage) {
              var scale = this.currentScale;
              var viewport = pdfPage.getViewport(scale * CSS_UNITS);
              for (var pageNum = 1; pageNum <= pagesCount; ++pageNum) {
                var textLayerFactory = null;
                if (!pdfjsLib.PDFJS.disableTextLayer) {
                  textLayerFactory = this;
                }
                var pageView = new PDFPageView({
                  container: this.viewer,
                  eventBus: this.eventBus,
                  id: pageNum,
                  scale: scale,
                  defaultViewport: viewport.clone(),
                  renderingQueue: this.renderingQueue,
                  textLayerFactory: textLayerFactory,
                  annotationLayerFactory: this,
                  enhanceTextSelection: this.enhanceTextSelection,
                  renderInteractiveForms: this.renderInteractiveForms
                });
                bindOnAfterAndBeforeDraw(pageView);
                this._pages.push(pageView);
              }
              var linkService = this.linkService;
              // Fetch all the pages since the viewport is needed before printing
              // starts to create the correct size canvas. Wait until one page is
              // rendered so we don't tie up too many resources early on.
              onePageRendered.then(function () {
                if (!pdfjsLib.PDFJS.disableAutoFetch) {
                  var getPagesLeft = pagesCount;
                  for (var pageNum = 1; pageNum <= pagesCount; ++pageNum) {
                    pdfDocument.getPage(pageNum).then(function (pageNum, pdfPage) {
                      var pageView = self._pages[pageNum - 1];
                      if (!pageView.pdfPage) {
                        pageView.setPdfPage(pdfPage);
                      }
                      linkService.cachePageRef(pageNum, pdfPage.ref);
                      getPagesLeft--;
                      if (!getPagesLeft) {
                        resolvePagesPromise();
                      }
                    }.bind(null, pageNum));
                  }
                } else {
                  // XXX: Printing is semi-broken with auto fetch disabled.
                  resolvePagesPromise();
                }
              });
              self.eventBus.dispatch('pagesinit', { source: self });
              if (this.defaultRenderingQueue) {
                this.update();
              }
              if (this.findController) {
                this.findController.resolveFirstPage();
              }
            }.bind(this));
          },
          _resetView: function () {
            this._pages = [];
            this._currentPageNumber = 1;
            this._currentScale = UNKNOWN_SCALE;
            this._currentScaleValue = null;
            this._buffer = new PDFPageViewBuffer(DEFAULT_CACHE_SIZE);
            this._location = null;
            this._pagesRotation = 0;
            this._pagesRequests = [];
            this._pageViewsReady = false;
            // Remove the pages from the DOM.
            this.viewer.textContent = '';
          },
          _scrollUpdate: function PDFViewer_scrollUpdate() {
            if (this.pagesCount === 0) {
              return;
            }
            this.update();
            for (var i = 0, ii = this._pages.length; i < ii; i++) {
              this._pages[i].updatePosition();
            }
          },
          _setScaleDispatchEvent: function pdfViewer_setScaleDispatchEvent(newScale, newValue, preset) {
            var arg = {
              source: this,
              scale: newScale,
              presetValue: preset ? newValue : undefined
            };
            this.eventBus.dispatch('scalechanging', arg);
            this.eventBus.dispatch('scalechange', arg);
          },
          _setScaleUpdatePages: function pdfViewer_setScaleUpdatePages(newScale, newValue, noScroll, preset) {
            this._currentScaleValue = newValue.toString();
            if (isSameScale(this._currentScale, newScale)) {
              if (preset) {
                this._setScaleDispatchEvent(newScale, newValue, true);
              }
              return;
            }
            for (var i = 0, ii = this._pages.length; i < ii; i++) {
              this._pages[i].update(newScale);
            }
            this._currentScale = newScale;
            if (!noScroll) {
              var page = this._currentPageNumber, dest;
              if (this._location && !pdfjsLib.PDFJS.ignoreCurrentPositionOnZoom && !(this.isInPresentationMode || this.isChangingPresentationMode)) {
                page = this._location.pageNumber;
                dest = [
                  null,
                  { name: 'XYZ' },
                  this._location.left,
                  this._location.top,
                  null
                ];
              }
              this.scrollPageIntoView({
                pageNumber: page,
                destArray: dest,
                allowNegativeOffset: true
              });
            }
            this._setScaleDispatchEvent(newScale, newValue, preset);
            if (this.defaultRenderingQueue) {
              this.update();
            }
          },
          _setScale: function PDFViewer_setScale(value, noScroll) {
            var scale = parseFloat(value);
            if (scale > 0) {
              this._setScaleUpdatePages(scale, value, noScroll, false);
            } else {
              var currentPage = this._pages[this._currentPageNumber - 1];
              if (!currentPage) {
                return;
              }
              var hPadding = this.isInPresentationMode || this.removePageBorders ? 0 : SCROLLBAR_PADDING;
              var vPadding = this.isInPresentationMode || this.removePageBorders ? 0 : VERTICAL_PADDING;
              var pageWidthScale = (this.container.clientWidth - hPadding) / currentPage.width * currentPage.scale;
              var pageHeightScale = (this.container.clientHeight - vPadding) / currentPage.height * currentPage.scale;
              switch (value) {
              case 'page-actual':
                scale = 1;
                break;
              case 'page-width':
                scale = pageWidthScale;
                break;
              case 'page-height':
                scale = pageHeightScale;
                break;
              case 'page-fit':
                scale = Math.min(pageWidthScale, pageHeightScale);
                break;
              case 'auto':
                var isLandscape = currentPage.width > currentPage.height;
                // For pages in landscape mode, fit the page height to the viewer
                // *unless* the page would thus become too wide to fit horizontally.
                var horizontalScale = isLandscape ? Math.min(pageHeightScale, pageWidthScale) : pageWidthScale;
                scale = Math.min(MAX_AUTO_SCALE, horizontalScale);
                break;
              default:
                console.error('PDFViewer_setScale: "' + value + '" is an unknown zoom value.');
                return;
              }
              this._setScaleUpdatePages(scale, value, noScroll, true);
            }
          },
          /**
           * Refreshes page view: scrolls to the current page and updates the scale.
           * @private
           */
          _resetCurrentPageView: function () {
            if (this.isInPresentationMode) {
              // Fixes the case when PDF has different page sizes.
              this._setScale(this._currentScaleValue, true);
            }
            var pageView = this._pages[this._currentPageNumber - 1];
            scrollIntoView(pageView.div);
          },
          /**
           * @typedef ScrollPageIntoViewParameters
           * @property {number} pageNumber - The page number.
           * @property {Array} destArray - (optional) The original PDF destination
           *   array, in the format: <page-ref> </XYZ|/FitXXX> <args..>
           * @property {boolean} allowNegativeOffset - (optional) Allow negative page
           *   offsets. The default value is `false`.
           */
          /**
           * Scrolls page into view.
           * @param {ScrollPageIntoViewParameters} params
           */
          scrollPageIntoView: function PDFViewer_scrollPageIntoView(params) {
            if (!this.pdfDocument) {
              return;
            }
            if (arguments.length > 1 || typeof params === 'number') {
              console.warn('Call of scrollPageIntoView() with obsolete signature.');
              var paramObj = {};
              if (typeof params === 'number') {
                paramObj.pageNumber = params;
              }
              // pageNumber argument was found.
              if (arguments[1] instanceof Array) {
                paramObj.destArray = arguments[1];
              }
              // destArray argument was found.
              params = paramObj;
            }
            var pageNumber = params.pageNumber || 0;
            var dest = params.destArray || null;
            var allowNegativeOffset = params.allowNegativeOffset || false;
            if (this.isInPresentationMode || !dest) {
              this._setCurrentPageNumber(pageNumber, /* resetCurrentPageView */
              true);
              return;
            }
            var pageView = this._pages[pageNumber - 1];
            if (!pageView) {
              console.error('PDFViewer_scrollPageIntoView: ' + 'Invalid "pageNumber" parameter.');
              return;
            }
            var x = 0, y = 0;
            var width = 0, height = 0, widthScale, heightScale;
            var changeOrientation = pageView.rotation % 180 === 0 ? false : true;
            var pageWidth = (changeOrientation ? pageView.height : pageView.width) / pageView.scale / CSS_UNITS;
            var pageHeight = (changeOrientation ? pageView.width : pageView.height) / pageView.scale / CSS_UNITS;
            var scale = 0;
            switch (dest[1].name) {
            case 'XYZ':
              x = dest[2];
              y = dest[3];
              scale = dest[4];
              // If x and/or y coordinates are not supplied, default to
              // _top_ left of the page (not the obvious bottom left,
              // since aligning the bottom of the intended page with the
              // top of the window is rarely helpful).
              x = x !== null ? x : 0;
              y = y !== null ? y : pageHeight;
              break;
            case 'Fit':
            case 'FitB':
              scale = 'page-fit';
              break;
            case 'FitH':
            case 'FitBH':
              y = dest[2];
              scale = 'page-width';
              // According to the PDF spec, section 12.3.2.2, a `null` value in the
              // parameter should maintain the position relative to the new page.
              if (y === null && this._location) {
                x = this._location.left;
                y = this._location.top;
              }
              break;
            case 'FitV':
            case 'FitBV':
              x = dest[2];
              width = pageWidth;
              height = pageHeight;
              scale = 'page-height';
              break;
            case 'FitR':
              x = dest[2];
              y = dest[3];
              width = dest[4] - x;
              height = dest[5] - y;
              var hPadding = this.removePageBorders ? 0 : SCROLLBAR_PADDING;
              var vPadding = this.removePageBorders ? 0 : VERTICAL_PADDING;
              widthScale = (this.container.clientWidth - hPadding) / width / CSS_UNITS;
              heightScale = (this.container.clientHeight - vPadding) / height / CSS_UNITS;
              scale = Math.min(Math.abs(widthScale), Math.abs(heightScale));
              break;
            default:
              console.error('PDFViewer_scrollPageIntoView: \'' + dest[1].name + '\' is not a valid destination type.');
              return;
            }
            if (scale && scale !== this._currentScale) {
              this.currentScaleValue = scale;
            } else if (this._currentScale === UNKNOWN_SCALE) {
              this.currentScaleValue = DEFAULT_SCALE_VALUE;
            }
            if (scale === 'page-fit' && !dest[4]) {
              scrollIntoView(pageView.div);
              return;
            }
            var boundingRect = [
              pageView.viewport.convertToViewportPoint(x, y),
              pageView.viewport.convertToViewportPoint(x + width, y + height)
            ];
            var left = Math.min(boundingRect[0][0], boundingRect[1][0]);
            var top = Math.min(boundingRect[0][1], boundingRect[1][1]);
            if (!allowNegativeOffset) {
              // Some bad PDF generators will create destinations with e.g. top values
              // that exceeds the page height. Ensure that offsets are not negative,
              // to prevent a previous page from becoming visible (fixes bug 874482).
              left = Math.max(left, 0);
              top = Math.max(top, 0);
            }
            scrollIntoView(pageView.div, {
              left: left,
              top: top
            });
          },
          _updateLocation: function (firstPage) {
            var currentScale = this._currentScale;
            var currentScaleValue = this._currentScaleValue;
            var normalizedScaleValue = parseFloat(currentScaleValue) === currentScale ? Math.round(currentScale * 10000) / 100 : currentScaleValue;
            var pageNumber = firstPage.id;
            var pdfOpenParams = '#page=' + pageNumber;
            pdfOpenParams += '&zoom=' + normalizedScaleValue;
            var currentPageView = this._pages[pageNumber - 1];
            var container = this.container;
            var topLeft = currentPageView.getPagePoint(container.scrollLeft - firstPage.x, container.scrollTop - firstPage.y);
            var intLeft = Math.round(topLeft[0]);
            var intTop = Math.round(topLeft[1]);
            pdfOpenParams += ',' + intLeft + ',' + intTop;
            this._location = {
              pageNumber: pageNumber,
              scale: normalizedScaleValue,
              top: intTop,
              left: intLeft,
              pdfOpenParams: pdfOpenParams
            };
          },
          update: function PDFViewer_update() {
            var visible = this._getVisiblePages();
            var visiblePages = visible.views;
            if (visiblePages.length === 0) {
              return;
            }
            var suggestedCacheSize = Math.max(DEFAULT_CACHE_SIZE, 2 * visiblePages.length + 1);
            this._buffer.resize(suggestedCacheSize);
            this.renderingQueue.renderHighestPriority(visible);
            var currentId = this._currentPageNumber;
            var firstPage = visible.first;
            for (var i = 0, ii = visiblePages.length, stillFullyVisible = false; i < ii; ++i) {
              var page = visiblePages[i];
              if (page.percent < 100) {
                break;
              }
              if (page.id === currentId) {
                stillFullyVisible = true;
                break;
              }
            }
            if (!stillFullyVisible) {
              currentId = visiblePages[0].id;
            }
            if (!this.isInPresentationMode) {
              this._setCurrentPageNumber(currentId);
            }
            this._updateLocation(firstPage);
            this.eventBus.dispatch('updateviewarea', {
              source: this,
              location: this._location
            });
          },
          containsElement: function (element) {
            return this.container.contains(element);
          },
          focus: function () {
            this.container.focus();
          },
          get isInPresentationMode() {
            return this.presentationModeState === PresentationModeState.FULLSCREEN;
          },
          get isChangingPresentationMode() {
            return this.presentationModeState === PresentationModeState.CHANGING;
          },
          get isHorizontalScrollbarEnabled() {
            return this.isInPresentationMode ? false : this.container.scrollWidth > this.container.clientWidth;
          },
          _getVisiblePages: function () {
            if (!this.isInPresentationMode) {
              return getVisibleElements(this.container, this._pages, true);
            } else {
              // The algorithm in getVisibleElements doesn't work in all browsers and
              // configurations when presentation mode is active.
              var visible = [];
              var currentPage = this._pages[this._currentPageNumber - 1];
              visible.push({
                id: currentPage.id,
                view: currentPage
              });
              return {
                first: currentPage,
                last: currentPage,
                views: visible
              };
            }
          },
          cleanup: function () {
            for (var i = 0, ii = this._pages.length; i < ii; i++) {
              if (this._pages[i] && this._pages[i].renderingState !== RenderingStates.FINISHED) {
                this._pages[i].reset();
              }
            }
          },
          /**
           * @private
           */
          _cancelRendering: function PDFViewer_cancelRendering() {
            for (var i = 0, ii = this._pages.length; i < ii; i++) {
              if (this._pages[i]) {
                this._pages[i].cancelRendering();
              }
            }
          },
          /**
           * @param {PDFPageView} pageView
           * @returns {PDFPage}
           * @private
           */
          _ensurePdfPageLoaded: function (pageView) {
            if (pageView.pdfPage) {
              return Promise.resolve(pageView.pdfPage);
            }
            var pageNumber = pageView.id;
            if (this._pagesRequests[pageNumber]) {
              return this._pagesRequests[pageNumber];
            }
            var promise = this.pdfDocument.getPage(pageNumber).then(function (pdfPage) {
              pageView.setPdfPage(pdfPage);
              this._pagesRequests[pageNumber] = null;
              return pdfPage;
            }.bind(this));
            this._pagesRequests[pageNumber] = promise;
            return promise;
          },
          forceRendering: function (currentlyVisiblePages) {
            var visiblePages = currentlyVisiblePages || this._getVisiblePages();
            var pageView = this.renderingQueue.getHighestPriority(visiblePages, this._pages, this.scroll.down);
            if (pageView) {
              this._ensurePdfPageLoaded(pageView).then(function () {
                this.renderingQueue.renderView(pageView);
              }.bind(this));
              return true;
            }
            return false;
          },
          getPageTextContent: function (pageIndex) {
            return this.pdfDocument.getPage(pageIndex + 1).then(function (page) {
              return page.getTextContent({ normalizeWhitespace: true });
            });
          },
          /**
           * @param {HTMLDivElement} textLayerDiv
           * @param {number} pageIndex
           * @param {PageViewport} viewport
           * @returns {TextLayerBuilder}
           */
          createTextLayerBuilder: function (textLayerDiv, pageIndex, viewport, enhanceTextSelection) {
            return new TextLayerBuilder({
              textLayerDiv: textLayerDiv,
              eventBus: this.eventBus,
              pageIndex: pageIndex,
              viewport: viewport,
              findController: this.isInPresentationMode ? null : this.findController,
              enhanceTextSelection: this.isInPresentationMode ? false : enhanceTextSelection
            });
          },
          /**
           * @param {HTMLDivElement} pageDiv
           * @param {PDFPage} pdfPage
           * @param {boolean} renderInteractiveForms
           * @returns {AnnotationLayerBuilder}
           */
          createAnnotationLayerBuilder: function (pageDiv, pdfPage, renderInteractiveForms) {
            return new AnnotationLayerBuilder({
              pageDiv: pageDiv,
              pdfPage: pdfPage,
              renderInteractiveForms: renderInteractiveForms,
              linkService: this.linkService,
              downloadManager: this.downloadManager
            });
          },
          setFindController: function (findController) {
            this.findController = findController;
          },
          /**
           * Returns sizes of the pages.
           * @returns {Array} Array of objects with width/height fields.
           */
          getPagesOverview: function () {
            return this._pages.map(function (pageView) {
              var viewport = pageView.pdfPage.getViewport(1);
              return {
                width: viewport.width,
                height: viewport.height
              };
            });
          }
        };
        return PDFViewer;
      }();
      exports.PresentationModeState = PresentationModeState;
      exports.PDFViewer = PDFViewer;
    }));
  }.call(pdfViewerLibs));
  var PDFJS = pdfjsLib.PDFJS;
  PDFJS.PDFViewer = pdfViewerLibs.pdfjsWebPDFViewer.PDFViewer;
  PDFJS.PDFPageView = pdfViewerLibs.pdfjsWebPDFPageView.PDFPageView;
  PDFJS.PDFLinkService = pdfViewerLibs.pdfjsWebPDFLinkService.PDFLinkService;
  PDFJS.TextLayerBuilder = pdfViewerLibs.pdfjsWebTextLayerBuilder.TextLayerBuilder;
  PDFJS.DefaultTextLayerFactory = pdfViewerLibs.pdfjsWebTextLayerBuilder.DefaultTextLayerFactory;
  PDFJS.AnnotationLayerBuilder = pdfViewerLibs.pdfjsWebAnnotationLayerBuilder.AnnotationLayerBuilder;
  PDFJS.DefaultAnnotationLayerFactory = pdfViewerLibs.pdfjsWebAnnotationLayerBuilder.DefaultAnnotationLayerFactory;
  PDFJS.PDFHistory = pdfViewerLibs.pdfjsWebPDFHistory.PDFHistory;
  PDFJS.PDFFindController = pdfViewerLibs.pdfjsWebPDFFindController.PDFFindController;
  PDFJS.EventBus = pdfViewerLibs.pdfjsWebUIUtils.EventBus;
  PDFJS.DownloadManager = pdfViewerLibs.pdfjsWebDownloadManager.DownloadManager;
  PDFJS.ProgressBar = pdfViewerLibs.pdfjsWebUIUtils.ProgressBar;
  exports.PDFJS = PDFJS;
}));