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
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
/*
* 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 Stage {
constructor(onReady, onNext, onPrevious) {
this.audienceScreen = null;
this.presenterScreen = null;
this.onReady = onReady;
this.eventHandlers = [
new KeyboardEventHandler(onNext, onPrevious),
new MouseClickEventHandler(onNext, onPrevious),
new TouchSwipeEventHandler(onNext, onPrevious)
];
}
start() {
this.projector = window.open(window.location.href, "_blank", "toolbar=0,location=0,menubar=0");
if (this.projector == null)
alert("Please allow pop-ups, then refresh this page.");
const self = this;
this.projector.addEventListener("load", function() {
self.audienceScreen = new Screen(self.projector, false, false);
self.presenterScreen = new Screen(window, true, true);
self._watchDetach();
self.onReady();
});
this._registerEventHandler(window);
this._registerEventHandler(this.projector);
}
setPage(page) {
this.audienceScreen.setPage(page);
this.presenterScreen.setPage(page);
}
_registerEventHandler(window) {
if (window == null) return;
this.eventHandlers.forEach(function(eventHandler) {
eventHandler.register(window);
});
}
_watchDetach() {
const self = this;
window.addEventListener("beforeunload", function() {
self._setMessage(self.projector, "Controller detached");
});
this.projector.addEventListener("beforeunload", function() {
self._setMessage(window, "Viewer detached");
});
}
_setMessage(window, message) {
const messageBar = window.document.getElementById("message");
messageBar.textContent = message;
}
}
|