pdfjs-dist/lib/web/pdf_viewer.js

/**
 * @licstart The following is the entire license notice for the
 * Javascript code in this page
 *
 * Copyright 2021 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.PDFViewer = void 0;

var _ui_utils = require("./ui_utils.js");

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

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

class PDFViewer extends _base_viewer.BaseViewer {
  get _viewerElement() {
    return (0, _pdf.shadow)(this, "_viewerElement", this.viewer);
  }

  _scrollIntoView({
    pageDiv,
    pageSpot = null,
    pageNumber = null
  }) {
    if (!pageSpot && !this.isInPresentationMode) {
      const left = pageDiv.offsetLeft + pageDiv.clientLeft;
      const right = left + pageDiv.clientWidth;
      const {
        scrollLeft,
        clientWidth
      } = this.container;

      if (this._isScrollModeHorizontal || left < scrollLeft || right > scrollLeft + clientWidth) {
        pageSpot = {
          left: 0,
          top: 0
        };
      }
    }

    super._scrollIntoView({
      pageDiv,
      pageSpot,
      pageNumber
    });
  }

  _getVisiblePages() {
    if (this.isInPresentationMode) {
      return this._getCurrentVisiblePage();
    }

    return super._getVisiblePages();
  }

  _updateHelper(visiblePages) {
    if (this.isInPresentationMode) {
      return;
    }

    let currentId = this._currentPageNumber;
    let stillFullyVisible = false;

    for (const page of visiblePages) {
      if (page.percent < 100) {
        break;
      }

      if (page.id === currentId && this._scrollMode === _ui_utils.ScrollMode.VERTICAL && this._spreadMode === _ui_utils.SpreadMode.NONE) {
        stillFullyVisible = true;
        break;
      }
    }

    if (!stillFullyVisible) {
      currentId = visiblePages[0].id;
    }

    this._setCurrentPageNumber(currentId);
  }

}

exports.PDFViewer = PDFViewer;