06cda4c2e7
This attempts to provide more "default" methods in the base class, in order to reduce unnecessary duplication and to improve self-documentation of the `BaseViewer` class slightly. The following changes are made (in no particular order): - Have `BaseViewer` implement the `_scrollIntoView` method, and *extend* it as necessary in `PDFViewer`/`PDFSinglePageViewer`. - Simply inline the `BaseViewer._resizeBuffer` method, in `BaseViewer.update`, since there's only one call-site at this point. - Provide a default implementation of `_isScrollModeHorizontal` in `BaseViewer`, and have `PDFSinglePageViewer` override it. - Provide a default implementation of `_getVisiblePages`, and have `PDFViewer` extend it and `PDFSinglePageViewer` override it.
72 lines
2.1 KiB
JavaScript
72 lines
2.1 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 { 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, 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) {
|
|
// The algorithm in `getVisibleElements` doesn't work in all browsers and
|
|
// configurations (e.g. Chrome) when Presentation Mode is active.
|
|
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) {
|
|
stillFullyVisible = true;
|
|
break;
|
|
}
|
|
}
|
|
if (!stillFullyVisible) {
|
|
currentId = visiblePages[0].id;
|
|
}
|
|
this._setCurrentPageNumber(currentId);
|
|
}
|
|
}
|
|
|
|
export {
|
|
PDFViewer,
|
|
};
|