git.iko.soy/unity8
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unity8/plugins/Dash/croppedimagesizerasyncworker.cpp
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1/*
2 * Copyright (C) 2014 Canonical, Ltd.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 3.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
15 */
17#include "croppedimagesizerasyncworker.h"
19#include "croppedimagesizer.h"
21#include <QNetworkReply>
22#include <QtConcurrentRun>
24CroppedImageSizerAsyncWorker::CroppedImageSizerAsyncWorker(CroppedImageSizer *sizer, QNetworkReply *reply)
25 : m_sizer(sizer),
26 m_reply(reply),
27 m_ignoreAbort(false)
29 connect(m_reply, &QNetworkReply::finished, this, &CroppedImageSizerAsyncWorker::requestFinished);
32void CroppedImageSizerAsyncWorker::abort()
34 // This runs on main thread
35 QMutexLocker locker(&m_mutex);
36 m_sizer = nullptr;
37 // If we already started the future run we can't abort the reply
38 // since we don't know at which stage the future is, just let it finish
39 if (!m_ignoreAbort) {
40 QMetaObject::invokeMethod(m_reply, "abort", Qt::QueuedConnection);
41 }
44void CroppedImageSizerAsyncWorker::requestFinished()
46 // This runs on main thread
47 QMutexLocker locker(&m_mutex);
48 if (m_sizer) {
49 m_ignoreAbort = true;
50 QtConcurrent::run(processRequestFinished, this);
51 } else {
52 // We were aborted delete ourselves
53 m_reply->deleteLater();
54 deleteLater();
55 }
58void CroppedImageSizerAsyncWorker::processRequestFinished(CroppedImageSizerAsyncWorker *worker)
60 // This runs on non main thread
61 // m_reply has finished at this point and is protected against change by m_ignoreAbort
62 QImageReader reader(worker->m_reply);
63 const QSize imageSize = reader.size();
65 worker->m_mutex.lock();
66 if (worker->m_sizer) {
67 QMetaObject::invokeMethod(worker->m_sizer, "setImageSize", Qt::QueuedConnection, Q_ARG(QSize, imageSize));
68 }
69 worker->m_mutex.unlock();
71 // All work is done, delete ourselves
72 worker->m_reply->deleteLater();
73 worker->deleteLater();