connection.hh

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#ifndef VSI_CONNECTION_HH
#define VSI_CONNECTION_HH
 
//== INCLUDES =================================================================
#include <QGraphicsLineItem>
#include <QPointF>
 
//== NAMESPACES ===============================================================
namespace VSI {
 
//== FORWARDDECLARATIONS ======================================================
 
class ConnectionPoint;
class ElementInOut;
class ElementInput;
class ElementOutput;
class GraphicsScene;
 
//== CLASS DEFINITION =========================================================
 
class Connection : public QObject, public QGraphicsPathItem
{
  Q_OBJECT
 
  public:
 
    Connection (ConnectionPoint *_start, QGraphicsScene *_scene);
    Connection (ConnectionPoint *_start, ConnectionPoint *_end, QGraphicsScene *_scene);
 
    ~Connection ();
 
    void updatePositions ();
 
    ElementInput *input ();
 
    ElementOutput *output ();
 
    const QPolygonF & way () const;
 
    void invalidate ();
 
  protected:
 
    friend class GraphicsScene;
 
    // mouse handling
    void mouseMoveEvent (QGraphicsSceneMouseEvent *_event);
    void mousePressEvent (QGraphicsSceneMouseEvent *_event);
    void mouseReleaseEvent (QGraphicsSceneMouseEvent *_event);
 
  private:
 
    // helper to localize a connection point
    ConnectionPoint *cPointAt (QPointF _pnt);
 
    // generates a curved line out of the way polygon
    void updateLine ();
 
  private:
 
    QGraphicsItem *elementArea_;
    GraphicsScene *scene_;
 
    ConnectionPoint *p1_;
    ConnectionPoint *p2_;
 
    ConnectionPoint *old_;
 
    QPolygonF way_;
};
 
}
 
#endif