interfaces.h Example File

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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;
  };

  #define BrushInterface_iid "org.qt-project.Qt.Examples.PlugAndPaint.BrushInterface"

  Q_DECLARE_INTERFACE(BrushInterface, BrushInterface_iid)

  #define ShapeInterface_iid  "org.qt-project.Qt.Examples.PlugAndPaint.ShapeInterface"

  Q_DECLARE_INTERFACE(ShapeInterface, ShapeInterface_iid)
  #define FilterInterface_iid "org.qt-project.Qt.Examples.PlugAndPaint.FilterInterface"

  Q_DECLARE_INTERFACE(FilterInterface, FilterInterface_iid)

  #endif