Russian Qt Forum

C++ (Qt)
class PPIDisplay : public QObject
{
  Q_OBJECT
public slots:
  virtual void createTarget(int id, int type, qreal x, qreal y) = 0;
  virtual void destroyTarget(int id) = 0;
  virtual void moveTarget(int id, qreal x, qreal y) = 0;
  virtual void moveRay(qreal delta) = 0;
};

C++ (Qt)
class SceneView : public PPIDisplay, public QGraphicsView
{
  Q_OBJECT
public:
  explicit SceneView(QWidget *parent = 0);
};

Warning: Class SceneView inherits from two QObject subclasses PPIDisplay and QGraphicsView. This is not supported!

C++ (Qt)
class PPIDisplay : public virtual QObject
 

C++ (Qt)
class PPIDisplay : public virtual QObject
 

C++ (Qt)
class Animal {
public:
  virtual void eat();
};
 
class Mammal : public virtual Animal {
public:
  virtual Color getHairColor();
};
 
class WingedAnimal : public virtual Animal {
public:
  virtual void flap();
};
 
class Bat : public Mammal, public WingedAnimal {};

C++ (Qt)
class PPIDisplay
  : public QObject
{
  Q_OBJECT
public slots:
  virtual void createTarget(int id, int type, qreal x, qreal y) = 0;
  virtual void destroyTarget(int id) = 0;
  virtual void moveTarget(int id, qreal x, qreal y) = 0;
  virtual void moveRay(qreal delta) = 0;
};

C++ (Qt)
class SceneDisplay
  : public QGraphicsScene, public PPIDisplay
{
public:
  SceneDisplay();
public slots:
  void createTarget(int id, int type, qreal x, qreal y) {}
  void destroyTarget(int id) {}
  void moveTarget(int id, qreal x, qreal y) {}
  void moveRay(qreal delta) {}
};
 

C++ (Qt)
class PPIDisplay : public QObject
{
  Q_OBJECT
 
public:
  PPIDisplay(QObject *parent = 0) : QObject(parent) {}
 
public slots:
  virtual void createTarget(int id, int type, qreal x, qreal y) = 0;
  virtual void destroyTarget(int id) = 0;
  virtual void moveTarget(int id, qreal x, qreal y) = 0;
  virtual void moveRay(qreal delta) = 0;
};

C++ (Qt)
class SceneDisplay : public PPIDisplay
{
  Q_OBJECT
 
public:
  SceneDisplay(QObject *parent = 0) : PPIDisplay(parent) {}
 
public slots:
  void createTarget(int id, int type, qreal x, qreal y);
  void destroyTarget(int id);
  void moveTarget(int id, qreal x, qreal y);
  void moveRay(qreal delta);
 
private:
  QGraphicsScene *m_scene;
};