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This is the verbatim text of the qwidgetplugin.h include file. It is provided only for illustration; the copyright remains with Trolltech.

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/****************************************************************************
** $Id:  qt/qwidgetplugin.h   3.0.5   edited Mar 12 15:48 $
**
** Definition of QWidgetPlugin class
**
** Created : 010920
**
** Copyright (C) 2001 Trolltech AS.  All rights reserved.
**
** This file is part of the widgets module of the Qt GUI Toolkit.
**
** This file may be distributed under the terms of the Q Public License
** as defined by Trolltech AS of Norway and appearing in the file
** LICENSE.QPL included in the packaging of this file.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** Licensees holding valid Qt Enterprise Edition or Qt Professional Edition
** 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
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
**   information about Qt Commercial License Agreements.
** See http://www.trolltech.com/qpl/ for QPL licensing information.
** See http://www.trolltech.com/gpl/ for GPL licensing information.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/

#ifndef QWIDGETPLUGIN_H
#define QWIDGETPLUGIN_H

#ifndef QT_H
#include "qgplugin.h"
#include "qstringlist.h"
#include "qiconset.h"
#endif // QT_H
#ifndef QT_NO_WIDGETPLUGIN

#ifdef Q_WS_WIN
#ifdef QT_PLUGIN
#define QT_WIDGET_PLUGIN_EXPORT __declspec(dllexport)
#else
#define QT_WIDGET_PLUGIN_EXPORT __declspec(dllimport)
#endif
#else
#define QT_WIDGET_PLUGIN_EXPORT
#endif

class QWidgetPluginPrivate;
class QWidget;

class Q_EXPORT QWidgetPlugin : public QGPlugin
{
    Q_OBJECT
public:
    QWidgetPlugin();
    ~QWidgetPlugin();

    virtual QStringList keys() const = 0;
    virtual QWidget *create( const QString &key, QWidget *parent = 0, const char *name = 0 ) = 0;
    
    virtual QString group( const QString &key ) const;
    virtual QIconSet iconSet( const QString &key ) const;
    virtual QString includeFile( const QString &key ) const;
    virtual QString toolTip( const QString &key ) const;
    virtual QString whatsThis( const QString &key ) const;
    virtual bool isContainer( const QString &key ) const;

private:
    QWidgetPluginPrivate *d;
};

#endif // QT_NO_WIDGETPLUGIN
#endif // QWIDGETPLUGIN_H