5fa9cca8dd
This patch introduces an abstract `BaseViewer` class, that the existing `PDFViewer` then extends. *Please note:* This lays the necessary foundation for the next patch.
84 lines
2.3 KiB
JavaScript
84 lines
2.3 KiB
JavaScript
/* 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.
|
|
*/
|
|
|
|
import { getVisibleElements, scrollIntoView } from './ui_utils';
|
|
import { BaseViewer } from './base_viewer';
|
|
import { shadow } from 'pdfjs-lib';
|
|
|
|
class PDFViewer extends BaseViewer {
|
|
get _setDocumentViewerElement() {
|
|
return shadow(this, '_setDocumentViewerElement', this.viewer);
|
|
}
|
|
|
|
_scrollIntoView({ pageDiv, pageSpot = null, }) {
|
|
scrollIntoView(pageDiv, pageSpot);
|
|
}
|
|
|
|
_getVisiblePages() {
|
|
if (!this.isInPresentationMode) {
|
|
return getVisibleElements(this.container, this._pages, true);
|
|
}
|
|
// The algorithm in getVisibleElements doesn't work in all browsers and
|
|
// configurations when presentation mode is active.
|
|
let currentPage = this._pages[this._currentPageNumber - 1];
|
|
let visible = [{ id: currentPage.id, view: currentPage, }];
|
|
return { first: currentPage, last: currentPage, views: visible, };
|
|
}
|
|
|
|
update() {
|
|
let visible = this._getVisiblePages();
|
|
let visiblePages = visible.views, numVisiblePages = visiblePages.length;
|
|
|
|
if (numVisiblePages === 0) {
|
|
return;
|
|
}
|
|
this._resizeBuffer(numVisiblePages);
|
|
|
|
this.renderingQueue.renderHighestPriority(visible);
|
|
|
|
let currentId = this._currentPageNumber;
|
|
let stillFullyVisible = false;
|
|
|
|
for (let i = 0; i < numVisiblePages; ++i) {
|
|
let 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(visible.first);
|
|
this.eventBus.dispatch('updateviewarea', {
|
|
source: this,
|
|
location: this._location,
|
|
});
|
|
}
|
|
}
|
|
|
|
export {
|
|
PDFViewer,
|
|
};
|