Async open file support in QNetworkAccessManager

This change adds support for BackgroundRequestAttribute to local file request. It is useful
when opening files located in network drives where the file open operation could take several
seconds to complete. When this attribute is activated the QNetworkAccessManager::get call
returns the reply immediately and the user has to wait until QNetworkReply::finished signal
is emitted or QNetworkReply::isFinished function returns true.

Task-number: QTBUG-45925
Change-Id: Ie2019dd94fe04253d1ef6874811d7e749a5aad93
Reviewed-by: Edward Welbourne <edward.welbourne@theqtcompany.com>
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@theqtcompany.com>

1 files changed, 68 insertions, 0 deletions

diff --git a/src/network/access/qnetworkfile_p.h b/src/network/access/qnetworkfile_p.h
new file mode 100644
index 0000000000..86c08170e6
--- /dev/null
+++ b/src/network/access/qnetworkfile_p.h
@@ -0,0 +1,68 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtNetwork module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QNETWORKFILE_H
+#define QNETWORKFILE_H
+
+#include <QFile>
+#include <qnetworkreply.h>
+
+QT_BEGIN_NAMESPACE
+
+class QNetworkFile : public QFile
+{
+    Q_OBJECT
+public:
+    QNetworkFile();
+    QNetworkFile(const QString &name);
+    using QFile::open;
+
+public Q_SLOTS:
+    void open();
+    void close() Q_DECL_OVERRIDE;
+
+Q_SIGNALS:
+    void finished(bool ok);
+    void headerRead(QNetworkRequest::KnownHeaders header, const QVariant &value);
+    void error(QNetworkReply::NetworkError error, const QString &message);
+};
+
+QT_END_NAMESPACE
+
+#endif // QNETWORKFILE_H