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/*
* 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 Viewer {
constructor() {
this.fileInput = document.getElementById("fileInput");
this.startButton = document.getElementById("startButton");
this.fileReader = new FileReader();
this.presentation = null;
document.addEventListener("DOMContentLoaded", () => this._unlockUi());
this._listenForInput();
}
_unlockUi() {
this.fileInput.disabled = false;
}
_preparePresentation(source) {
pdfjsLib.getDocument(source).then(pdf => {
this.presentation = new Presentation(pdf);
}).catch(error => {
console.error(error);
window.alert("Error while loading presentation:\n\n" + error.message);
window.location.href = window.location.pathname; // reload without "?file=..."
});
}
_readFile(file) {
this.fileReader.onload = () => {
this._setPresentation(new Uint8Array(this.result));
}
this.fileReader.abort();
this.fileReader.readAsArrayBuffer(file);
}
_setPresentation(presentation) {
this._preparePresentation(presentation);
this.startButton.disabled = false;
}
_setFileName(name) {
const dummy = new DataTransfer();
dummy.items.add(new File([], name));
this.fileInput.files = dummy.files;
}
_loadFromUrl(url) {
this._setFileName(url);
this._setPresentation(url);
}
_listenForInput() {
fileInput.addEventListener("change", event => {
this._readFile(event.target.files[0]);
});
startButton.addEventListener("click", event => {
event.preventDefault();
event.stopPropagation();
this.presentation.start();
});
document.body.addEventListener("drop", event => {
event.preventDefault();
event.stopPropagation();
this.fileInput.files = event.dataTransfer.files;
this._readFile(event.dataTransfer.files[0]);
});
document.body.addEventListener("dragover", event => {
event.preventDefault();
event.stopPropagation();
});
window.addEventListener('load', () => this._on_hash_change());
window.addEventListener('hashchange', () => this._on_hash_change());
}
_on_hash_change() {
const params = this._hash_params();
if ("file" in params)
this._loadFromUrl(params["file"]);
}
_hash_params() {
const queryDict = {};
location.hash.slice(1).split("&").forEach(item => {
const pair = item.split("=");
queryDict[pair[0]] = pair[1];
});
return queryDict;
}
}
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