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interfaces.h Example File
tools/plugandpaint/interfaces.h

    /****************************************************************************
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    ** Copyright (C) 2005-2006 Trolltech AS. All rights reserved.
    **
    ** This file is part of the documentation of the Qt Toolkit.
    **
    ** This file may be used under the terms of the GNU General Public
    ** License version 2.0 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 GNU
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    ** http://www.trolltech.com/products/qt/opensource.html
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    #ifndef INTERFACES_H
    #define INTERFACES_H

    class QImage;
    class QPainter;
    class QPainterPath;
    class QPoint;
    class QRect;
    class QString;
    class QStringList;

    class BrushInterface
    {
    public:
        virtual ~BrushInterface() {}

        virtual QStringList brushes() const = 0;
        virtual QRect mousePress(const QString &brush, QPainter &painter,
                                 const QPoint &pos) = 0;
        virtual QRect mouseMove(const QString &brush, QPainter &painter,
                                const QPoint &oldPos, const QPoint &newPos) = 0;
        virtual QRect mouseRelease(const QString &brush, QPainter &painter,
                                   const QPoint &pos) = 0;
    };

    class ShapeInterface
    {
    public:
        virtual ~ShapeInterface() {}

        virtual QStringList shapes() const = 0;
        virtual QPainterPath generateShape(const QString &shape,
                                           QWidget *parent) = 0;
    };

    class FilterInterface
    {
    public:
        virtual ~FilterInterface() {}

        virtual QStringList filters() const = 0;
        virtual QImage filterImage(const QString &filter, const QImage &image,
                                   QWidget *parent) = 0;
    };

    Q_DECLARE_INTERFACE(BrushInterface,
                        "com.trolltech.PlugAndPaint.BrushInterface/1.0")
    Q_DECLARE_INTERFACE(ShapeInterface,
                        "com.trolltech.PlugAndPaint.ShapeInterface/1.0")
    Q_DECLARE_INTERFACE(FilterInterface,
                        "com.trolltech.PlugAndPaint.FilterInterface/1.0")

    #endif


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Qt 4.1.3