Long live Qt 4.5!

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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, 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
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qiconengineplugin.h"
+#include "qiconengine.h"
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    \class QIconEnginePlugin
+    \brief The QIconEnginePlugin class provides an abstract base for custom QIconEngine plugins.
+
+    \ingroup plugins
+
+    \bold {Use QIconEnginePluginV2 instead.}
+
+    The icon engine plugin is a simple plugin interface that makes it easy to
+    create custom icon engines that can be loaded dynamically into applications
+    through QIcon. QIcon uses the file or resource name's suffix to determine
+    what icon engine to use.
+
+    Writing a icon engine plugin is achieved by subclassing this base class,
+    reimplementing the pure virtual functions keys() and create(), and
+    exporting the class with the Q_EXPORT_PLUGIN2() macro.
+
+    \sa {How to Create Qt Plugins}
+*/
+
+/*!
+    \fn QStringList QIconEnginePlugin::keys() const
+
+    Returns a list of icon engine keys that this plugin supports. The keys correspond
+    to the suffix of the file or resource name used when the plugin was created.
+    Keys are case insensitive.
+
+    \sa create()
+*/
+
+/*!
+    \fn QIconEngine* QIconEnginePlugin::create(const QString& filename)
+
+    Creates and returns a QIconEngine object for the icon with the given
+    \a filename.
+
+    \sa keys()
+*/
+
+/*!
+    Constructs a icon engine plugin with the given \a parent. This is invoked
+    automatically by the Q_EXPORT_PLUGIN2() macro.
+*/
+QIconEnginePlugin::QIconEnginePlugin(QObject *parent)
+    : QObject(parent)
+{
+}
+
+/*!
+    Destroys the icon engine plugin.
+
+    You never have to call this explicitly. Qt destroys a plugin
+    automatically when it is no longer used.
+*/
+QIconEnginePlugin::~QIconEnginePlugin()
+{
+}
+
+// version 2
+
+/*!
+    \class QIconEnginePluginV2
+    \brief The QIconEnginePluginV2 class provides an abstract base for custom QIconEngineV2 plugins.
+
+    \ingroup plugins
+    \since 4.3
+ 
+    Icon engine plugins produces \l{QIconEngine}s for \l{QIcon}s; an
+    icon engine is used to render the icon. The keys that identifies
+    the engines the plugin can create are suffixes of 
+    icon filenames; they are returned by keys(). The create() function
+    receives the icon filename to return an engine for; it should
+    return 0 if it cannot produce an engine for the file.
+
+    Writing an icon engine plugin is achieved by inheriting
+    QIconEnginePluginV2, reimplementing keys() and create(), and
+    adding the Q_EXPORT_PLUGIN2() macro.
+
+    You should ensure that you do not duplicate keys. Qt will query
+    the plugins for icon engines in the order in which the plugins are
+    found during plugin search (see the plugins \l{How to Create Qt
+    Plugins}{overview document}).
+
+    \sa {How to Create Qt Plugins}
+*/
+
+/*!
+    \fn QStringList QIconEnginePluginV2::keys() const
+
+    Returns a list of icon engine keys that this plugin supports. The keys correspond
+    to the suffix of the file or resource name used when the plugin was created.
+    Keys are case insensitive.
+
+    \sa create()
+*/
+
+/*!
+    \fn QIconEngineV2* QIconEnginePluginV2::create(const QString& filename = QString())
+
+    Creates and returns a QIconEngine object for the icon with the given
+    \a filename.
+
+    \sa keys()
+*/
+
+/*!
+    Constructs a icon engine plugin with the given \a parent. This is invoked
+    automatically by the Q_EXPORT_PLUGIN2() macro.
+*/
+QIconEnginePluginV2::QIconEnginePluginV2(QObject *parent)
+    : QObject(parent)
+{
+}
+
+/*!
+    Destroys the icon engine plugin.
+
+    You never have to call this explicitly. Qt destroys a plugin
+    automatically when it is no longer used.
+*/
+QIconEnginePluginV2::~QIconEnginePluginV2()
+{
+}
+
+QT_END_NAMESPACE