blob: 753027bed6572057ef1292053796f3699a574720 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
/*
* Beamer Viewer, a web-based PDF presentation viewer
* Copyright (C) 2018-2023 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();
}
start() {
this.stage.start();
}
_setupStage() {
return new Stage(
() => this._onStageReady(),
() => this._onNext(),
() => this._onPrevious(),
);
}
_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) {
this.currentPageIndex = pageIndex;
this.pdf
.getPage(this.currentPageIndex)
.then(page => this.stage.setPage(page))
}
}
|