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/*
* Beamer Viewer, a web-based PDF presentation viewer
* Copyright (C) 2018 Pacien TRAN-GIRARD
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
"use strict";
class Presentation {
constructor(pdf) {
this.pdf = pdf;
this.currentPageIndex = 1;
this.stage = this._setupStage();
}
_setupStage() {
const self = this;
const onStageReadyCallback = function() { self._onStageReady(); };
const onNextCallback = function() { self._onNext(); };
const onPreviousCallback = function() { self._onPrevious(); };
return new Stage(onStageReadyCallback, onNextCallback, onPreviousCallback);
}
_onStageReady() {
this._setPage(this.currentPageIndex);
}
_onNext() {
if (this.currentPageIndex === this.pdf.numPages) return;
this._setPage(this.currentPageIndex + 1);
}
_onPrevious() {
if (this.currentPageIndex === 1) return;
this._setPage(this.currentPageIndex - 1);
}
_setPage(pageIndex) {
const self = this;
this.currentPageIndex = pageIndex;
this.pdf.getPage(this.currentPageIndex).then(function(page) {
self.stage.setPage(page);
})
}
}
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