pdfjs-dist/lib/web/pdf_single_page_viewer.js

/**
 * @licstart The following is the entire license notice for the
 * Javascript code in this page
 *
 * Copyright 2019 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.
 *
 * @licend The above is the entire license notice for the
 * Javascript code in this page
 */
"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.PDFSinglePageViewer = void 0;

var _base_viewer = require("./base_viewer");

var _pdf = require("../pdf");

function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }

function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }

function _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }

function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }

function _get(target, property, receiver) { if (typeof Reflect !== "undefined" && Reflect.get) { _get = Reflect.get; } else { _get = function _get(target, property, receiver) { var base = _superPropBase(target, property); if (!base) return; var desc = Object.getOwnPropertyDescriptor(base, property); if (desc.get) { return desc.get.call(receiver); } return desc.value; }; } return _get(target, property, receiver || target); }

function _superPropBase(object, property) { while (!Object.prototype.hasOwnProperty.call(object, property)) { object = _getPrototypeOf(object); if (object === null) break; } return object; }

function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }

function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }

function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }

var PDFSinglePageViewer =
/*#__PURE__*/
function (_BaseViewer) {
  _inherits(PDFSinglePageViewer, _BaseViewer);

  function PDFSinglePageViewer(options) {
    var _this;

    _classCallCheck(this, PDFSinglePageViewer);

    _this = _possibleConstructorReturn(this, _getPrototypeOf(PDFSinglePageViewer).call(this, options));

    _this.eventBus.on('pagesinit', function (evt) {
      _this._ensurePageViewVisible();
    });

    return _this;
  }

  _createClass(PDFSinglePageViewer, [{
    key: "_resetView",
    value: function _resetView() {
      _get(_getPrototypeOf(PDFSinglePageViewer.prototype), "_resetView", this).call(this);

      this._previousPageNumber = 1;
      this._shadowViewer = document.createDocumentFragment();
      this._updateScrollDown = null;
    }
  }, {
    key: "_ensurePageViewVisible",
    value: function _ensurePageViewVisible() {
      var pageView = this._pages[this._currentPageNumber - 1];
      var previousPageView = this._pages[this._previousPageNumber - 1];
      var viewerNodes = this.viewer.childNodes;

      switch (viewerNodes.length) {
        case 0:
          this.viewer.appendChild(pageView.div);
          break;

        case 1:
          if (viewerNodes[0] !== previousPageView.div) {
            throw new Error('_ensurePageViewVisible: Unexpected previously visible page.');
          }

          if (pageView === previousPageView) {
            break;
          }

          this._shadowViewer.appendChild(previousPageView.div);

          this.viewer.appendChild(pageView.div);
          this.container.scrollTop = 0;
          break;

        default:
          throw new Error('_ensurePageViewVisible: Only one page should be visible at a time.');
      }

      this._previousPageNumber = this._currentPageNumber;
    }
  }, {
    key: "_scrollUpdate",
    value: function _scrollUpdate() {
      if (this._updateScrollDown) {
        this._updateScrollDown();
      }

      _get(_getPrototypeOf(PDFSinglePageViewer.prototype), "_scrollUpdate", this).call(this);
    }
  }, {
    key: "_scrollIntoView",
    value: function _scrollIntoView(_ref) {
      var _this2 = this;

      var pageDiv = _ref.pageDiv,
          _ref$pageSpot = _ref.pageSpot,
          pageSpot = _ref$pageSpot === void 0 ? null : _ref$pageSpot,
          _ref$pageNumber = _ref.pageNumber,
          pageNumber = _ref$pageNumber === void 0 ? null : _ref$pageNumber;

      if (pageNumber) {
        this._setCurrentPageNumber(pageNumber);
      }

      var scrolledDown = this._currentPageNumber >= this._previousPageNumber;

      this._ensurePageViewVisible();

      this.update();

      _get(_getPrototypeOf(PDFSinglePageViewer.prototype), "_scrollIntoView", this).call(this, {
        pageDiv: pageDiv,
        pageSpot: pageSpot,
        pageNumber: pageNumber
      });

      this._updateScrollDown = function () {
        _this2.scroll.down = scrolledDown;
        _this2._updateScrollDown = null;
      };
    }
  }, {
    key: "_getVisiblePages",
    value: function _getVisiblePages() {
      return this._getCurrentVisiblePage();
    }
  }, {
    key: "_updateHelper",
    value: function _updateHelper(visiblePages) {}
  }, {
    key: "_updateScrollMode",
    value: function _updateScrollMode() {}
  }, {
    key: "_updateSpreadMode",
    value: function _updateSpreadMode() {}
  }, {
    key: "_setDocumentViewerElement",
    get: function get() {
      return (0, _pdf.shadow)(this, '_setDocumentViewerElement', this._shadowViewer);
    }
  }, {
    key: "_isScrollModeHorizontal",
    get: function get() {
      return (0, _pdf.shadow)(this, '_isScrollModeHorizontal', false);
    }
  }]);

  return PDFSinglePageViewer;
}(_base_viewer.BaseViewer);

exports.PDFSinglePageViewer = PDFSinglePageViewer;