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

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     #ifndef INTERFACES_H
     #define INTERFACES_H

     #include <QtPlugin>

     class QImage;
     class QPainter;
     class QWidget;
     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