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<h1 class="title">autosaver.cpp Example File</h1>
<span class="subtitle">webkitwidgets/browser/autosaver.cpp</span>
<!-- $$$webkitwidgets/browser/autosaver.cpp-description -->
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<pre class="cpp"><span class="comment">/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the demonstration applications 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 Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/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 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
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<span class="preprocessor">#include "autosaver.h"</span>
<span class="preprocessor">#include <QtCore/QDir></span>
<span class="preprocessor">#include <QtCore/QCoreApplication></span>
<span class="preprocessor">#include <QtCore/QMetaObject></span>
<span class="preprocessor">#include <QtDebug></span>
<span class="preprocessor">#define AUTOSAVE_IN 1000 * 3 // seconds</span>
<span class="preprocessor">#define MAXWAIT 1000 * 15 // seconds</span>
AutoSaver<span class="operator">::</span>AutoSaver(<span class="type">QObject</span> <span class="operator">*</span>parent) : <span class="type">QObject</span>(parent)
{
Q_ASSERT(parent);
}
AutoSaver<span class="operator">::</span><span class="operator">~</span>AutoSaver()
{
<span class="keyword">if</span> (m_timer<span class="operator">.</span>isActive())
qWarning() <span class="operator"><</span><span class="operator"><</span> <span class="string">"AutoSaver: still active when destroyed, changes not saved."</span>;
}
<span class="type">void</span> AutoSaver<span class="operator">::</span>changeOccurred()
{
<span class="keyword">if</span> (m_firstChange<span class="operator">.</span>isNull())
m_firstChange<span class="operator">.</span>start();
<span class="keyword">if</span> (m_firstChange<span class="operator">.</span>elapsed() <span class="operator">></span> MAXWAIT) {
saveIfNeccessary();
} <span class="keyword">else</span> {
m_timer<span class="operator">.</span>start(AUTOSAVE_IN<span class="operator">,</span> <span class="keyword">this</span>);
}
}
<span class="type">void</span> AutoSaver<span class="operator">::</span>timerEvent(<span class="type">QTimerEvent</span> <span class="operator">*</span>event)
{
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>timerId() <span class="operator">=</span><span class="operator">=</span> m_timer<span class="operator">.</span>timerId()) {
saveIfNeccessary();
} <span class="keyword">else</span> {
<span class="type">QObject</span><span class="operator">::</span>timerEvent(event);
}
}
<span class="type">void</span> AutoSaver<span class="operator">::</span>saveIfNeccessary()
{
<span class="keyword">if</span> (<span class="operator">!</span>m_timer<span class="operator">.</span>isActive())
<span class="keyword">return</span>;
m_timer<span class="operator">.</span>stop();
m_firstChange <span class="operator">=</span> <span class="type">QTime</span>();
<span class="keyword">if</span> (<span class="operator">!</span><span class="type">QMetaObject</span><span class="operator">::</span>invokeMethod(parent()<span class="operator">,</span> <span class="string">"save"</span><span class="operator">,</span> <span class="type">Qt</span><span class="operator">::</span>DirectConnection)) {
qWarning() <span class="operator"><</span><span class="operator"><</span> <span class="string">"AutoSaver: error invoking slot save() on parent"</span>;
}
}</pre>
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