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