84 lines
2.3 KiB
JavaScript
84 lines
2.3 KiB
JavaScript
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/* Copyright 2014 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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import { getVisibleElements, scrollIntoView } from './ui_utils';
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import { BaseViewer } from './base_viewer';
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import { shadow } from 'pdfjs-lib';
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class PDFViewer extends BaseViewer {
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get _setDocumentViewerElement() {
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return shadow(this, '_setDocumentViewerElement', this.viewer);
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}
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_scrollIntoView({ pageDiv, pageSpot = null, }) {
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scrollIntoView(pageDiv, pageSpot);
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}
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_getVisiblePages() {
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if (!this.isInPresentationMode) {
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return getVisibleElements(this.container, this._pages, true);
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}
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// The algorithm in getVisibleElements doesn't work in all browsers and
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// configurations when presentation mode is active.
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let currentPage = this._pages[this._currentPageNumber - 1];
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let visible = [{ id: currentPage.id, view: currentPage, }];
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return { first: currentPage, last: currentPage, views: visible, };
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}
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update() {
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let visible = this._getVisiblePages();
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let visiblePages = visible.views, numVisiblePages = visiblePages.length;
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if (numVisiblePages === 0) {
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return;
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}
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this._resizeBuffer(numVisiblePages);
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this.renderingQueue.renderHighestPriority(visible);
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let currentId = this._currentPageNumber;
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let stillFullyVisible = false;
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for (let i = 0; i < numVisiblePages; ++i) {
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let page = visiblePages[i];
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if (page.percent < 100) {
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break;
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}
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if (page.id === currentId) {
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stillFullyVisible = true;
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break;
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}
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}
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if (!stillFullyVisible) {
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currentId = visiblePages[0].id;
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}
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if (!this.isInPresentationMode) {
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this._setCurrentPageNumber(currentId);
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}
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this._updateLocation(visible.first);
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this.eventBus.dispatch('updateviewarea', {
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source: this,
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location: this._location,
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});
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}
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}
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export {
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PDFViewer,
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};
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