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/****************************************************************************
**
** Implementation of QSqlDriverPlugin class
**
** Created : 010920
**
** Copyright (C) 2005-2008 Trolltech ASA. All rights reserved.
**
** This file is part of the widgets module of the Qt GUI Toolkit.
**
** This file may be used under the terms of the GNU General
** Public License versions 2.0 or 3.0 as published by the Free
** Software Foundation and appearing in the files LICENSE.GPL2
** and LICENSE.GPL3 included in the packaging of this file.
** Alternatively you may (at your option) use any later version
** of the GNU General Public License if such license has been
** publicly approved by Trolltech ASA (or its successors, if any)
** and the KDE Free Qt Foundation.
**
** Please review the following information to ensure GNU General
** Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/.
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at [email protected].
**
** This file may be used under the terms of the Q Public License as
** defined by Trolltech ASA and appearing in the file LICENSE.QPL
** included in the packaging of this file. Licensees holding valid Qt
** Commercial licenses may use this file in accordance with the Qt
** Commercial License Agreement provided with the Software.
**
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
** herein.
**
**********************************************************************/
#include "qstyleplugin.h"
#ifndef QT_NO_STYLE
#ifndef QT_NO_COMPONENT
#include "qstyleinterface_p.h"
#include "qobjectcleanuphandler.h"
#include "qstyle.h"
/*!
\class QStylePlugin qstyleplugin.h
\brief The QStylePlugin class provides an abstract base for custom QStyle plugins.
\ingroup plugins
The style plugin is a simple plugin interface that makes it easy
to create custom styles that can be loaded dynamically into
applications with a QStyleFactory.
Writing a style plugin is achieved by subclassing this base class,
reimplementing the pure virtual functions keys() and create(), and
exporting the class with the \c Q_EXPORT_PLUGIN macro. See the
\link plugins-howto.html plugins documentation\endlink for an
example.
*/
/*!
\fn QStringList QStylePlugin::keys() const
Returns the list of style keys this plugin supports.
These keys are usually the class names of the custom styles that
are implemented in the plugin.
\sa create()
*/
/*!
\fn QStyle* QStylePlugin::create( const QString& key )
Creates and returns a QStyle object for the style key \a key. The
style key is usually the class name of the required style.
\sa keys()
*/
class QStylePluginPrivate : public QStyleFactoryInterface, public QLibraryInterface
{
public:
QStylePluginPrivate( QStylePlugin *p )
: plugin( p )
{
}
virtual ~QStylePluginPrivate();
QRESULT queryInterface( const QUuid &iid, QUnknownInterface **iface );
Q_REFCOUNT;
QStringList featureList() const;
QStyle *create( const QString &key );
bool init();
void cleanup();
bool canUnload() const;
private:
QStylePlugin *plugin;
QObjectCleanupHandler styles;
};
QRESULT QStylePluginPrivate::queryInterface( const QUuid &iid, QUnknownInterface **iface )
{
*iface = 0;
if ( iid == IID_QUnknown )
*iface = (QStyleFactoryInterface*)this;
else if ( iid == IID_QFeatureList )
*iface = (QFeatureListInterface*)this;
else if ( iid == IID_QStyleFactory )
*iface = (QStyleFactoryInterface*)this;
else if ( iid == IID_QLibrary )
*iface = (QLibraryInterface*) this;
else
return QE_NOINTERFACE;
(*iface)->addRef();
return QS_OK;
}
QStylePluginPrivate::~QStylePluginPrivate()
{
delete plugin;
}
QStringList QStylePluginPrivate::featureList() const
{
return plugin->keys();
}
QStyle *QStylePluginPrivate::create( const QString &key )
{
QStyle *st = plugin->create( key );
styles.add( st );
return st;
}
bool QStylePluginPrivate::init()
{
return TRUE;
}
void QStylePluginPrivate::cleanup()
{
styles.clear();
}
bool QStylePluginPrivate::canUnload() const
{
return styles.isEmpty();
}
/*!
Constructs a style plugin. This is invoked automatically by the
\c Q_EXPORT_PLUGIN macro.
*/
QStylePlugin::QStylePlugin()
: QGPlugin( (QStyleFactoryInterface*)(d = new QStylePluginPrivate( this )) )
{
}
/*!
Destroys the style plugin.
You never have to call this explicitly. Qt destroys a plugin
automatically when it is no longer used.
*/
QStylePlugin::~QStylePlugin()
{
// don't delete d, as this is deleted by d
}
#endif // QT_NO_COMPONENT
#endif // QT_NO_STYLE
|
