arrow.hh

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/*===========================================================================*\
*                                                                            *
*   $Revision$                                                       *
*   $LastChangedBy$                                                *
*   $Date$                     *
*                                                                            *
\*===========================================================================*/

#ifndef VSI_ARROW_HH
#define VSI_ARROW_HH

//== INCLUDES =================================================================
#include <QGraphicsWidget>
#include <QGraphicsPathItem>
#include <QString>
#include <QTimer>

//== NAMESPACES ===============================================================
namespace VSI {

//== FORWARDDECLARATIONS ======================================================
class GraphicsScene;

//== CLASS DEFINITION =========================================================

class Arrow : public QObject, public QGraphicsPixmapItem, public QGraphicsLayoutItem
{
  Q_OBJECT
  Q_INTERFACES(QGraphicsLayoutItem)

  public:

    enum Direction
    {
      North,
      South,
      East,
      West,
      Center
    };

  public:

    Arrow (GraphicsScene *_scene, QGraphicsItem *_parent, Direction _dir);

    ~Arrow ();

    void activate ();

    void reset ();

    void setHighlight (bool _highlight);

    virtual void setGeometry (const QRectF &_rect);

  protected:

    // catch mouse hover events
    virtual void hoverEnterEvent (QGraphicsSceneHoverEvent *_event);
    virtual void hoverLeaveEvent (QGraphicsSceneHoverEvent *_event);

    // catch mouse press/release events
    virtual void mousePressEvent (QGraphicsSceneMouseEvent *_event);
    virtual void mouseReleaseEvent (QGraphicsSceneMouseEvent *_event);

    // catch mouse wheel events
    virtual void wheelEvent (QGraphicsSceneWheelEvent *_event);

    // size information for layouting
    virtual QSizeF sizeHint ( Qt::SizeHint _which, const QSizeF & _constraint = QSizeF()) const;

  private slots:
    void timeout ();

  private:
    GraphicsScene *scene_;

    Direction dir_;

    QTimer timer_;

    int interval_;

    bool moveSelected_;

    bool highlight_;
};

//=============================================================================
}
//=============================================================================

#endif