137 lines
3.2 KiB
JavaScript
137 lines
3.2 KiB
JavaScript
/**
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* @licstart The following is the entire license notice for the
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* Javascript code in this page
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*
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* Copyright 2020 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* @licend The above is the entire license notice for the
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* Javascript code in this page
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*/
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"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.PDFSinglePageViewer = void 0;
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var _base_viewer = require("./base_viewer.js");
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var _pdf = require("../pdf");
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class PDFSinglePageViewer extends _base_viewer.BaseViewer {
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constructor(options) {
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super(options);
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this.eventBus._on("pagesinit", evt => {
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this._ensurePageViewVisible();
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});
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}
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get _viewerElement() {
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return (0, _pdf.shadow)(this, "_viewerElement", this._shadowViewer);
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}
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_resetView() {
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super._resetView();
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this._previousPageNumber = 1;
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this._shadowViewer = document.createDocumentFragment();
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this._updateScrollDown = null;
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}
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_ensurePageViewVisible() {
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const pageView = this._pages[this._currentPageNumber - 1];
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const previousPageView = this._pages[this._previousPageNumber - 1];
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const viewerNodes = this.viewer.childNodes;
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switch (viewerNodes.length) {
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case 0:
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this.viewer.appendChild(pageView.div);
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break;
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case 1:
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if (viewerNodes[0] !== previousPageView.div) {
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throw new Error("_ensurePageViewVisible: Unexpected previously visible page.");
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}
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if (pageView === previousPageView) {
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break;
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}
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this._shadowViewer.appendChild(previousPageView.div);
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this.viewer.appendChild(pageView.div);
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this.container.scrollTop = 0;
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break;
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default:
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throw new Error("_ensurePageViewVisible: Only one page should be visible at a time.");
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}
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this._previousPageNumber = this._currentPageNumber;
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}
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_scrollUpdate() {
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if (this._updateScrollDown) {
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this._updateScrollDown();
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}
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super._scrollUpdate();
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}
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_scrollIntoView({
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pageDiv,
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pageSpot = null,
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pageNumber = null
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}) {
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if (pageNumber) {
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this._setCurrentPageNumber(pageNumber);
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}
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const scrolledDown = this._currentPageNumber >= this._previousPageNumber;
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this._ensurePageViewVisible();
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this.update();
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super._scrollIntoView({
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pageDiv,
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pageSpot,
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pageNumber
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});
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this._updateScrollDown = () => {
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this.scroll.down = scrolledDown;
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this._updateScrollDown = null;
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};
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}
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_getVisiblePages() {
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return this._getCurrentVisiblePage();
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}
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_updateHelper(visiblePages) {}
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get _isScrollModeHorizontal() {
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return (0, _pdf.shadow)(this, "_isScrollModeHorizontal", false);
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}
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_updateScrollMode() {}
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_updateSpreadMode() {}
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}
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exports.PDFSinglePageViewer = PDFSinglePageViewer; |