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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