ddtPointGrabber.hpp

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#ifndef DDT_DATAVISUALISATION_UTILS_POINTGRABBER_HPP
#define DDT_DATAVISUALISATION_UTILS_POINTGRABBER_HPP
 
#include <math.h>
#include <QGraphicsItem>
#include <QGraphicsSceneDragDropEvent>
#include <QPainter>
#include <QPen>
 
const int DDT_POINT_GRABBER_SIZE = 16;
 

class PointGrabber : public QGraphicsItem {
 public:
  explicit PointGrabber(QGraphicsItem *parent = nullptr, const int point_num = 0);

  int GetPointNumber() const;

  void SetMouseState(const int state);

  int GetMouseState() const;

  qreal mouse_down_x = 0.0;

  qreal mouse_down_y = 0.0;
 
  enum { 
    PG_MOUSE_RELEASED = 0, 
    PG_MOUSE_DOWN, 
    PG_MOUSE_MOVING
  };
 
 private:
  virtual QRectF boundingRect() const override;
 
  virtual void paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
                     QWidget *widget) override;
 
  virtual void hoverEnterEvent(QGraphicsSceneHoverEvent *event) override;
  virtual void hoverLeaveEvent(QGraphicsSceneHoverEvent *event) override;
 
  virtual void mouseMoveEvent(QGraphicsSceneMouseEvent *event) override;
  virtual void mouseMoveEvent(QGraphicsSceneDragDropEvent *event);
  virtual void mousePressEvent(QGraphicsSceneMouseEvent *event) override;
  virtual void mousePressEvent(QGraphicsSceneDragDropEvent *event);
  virtual void mouseReleaseEvent(QGraphicsSceneMouseEvent *event) override;
 
  void Initialize(QGraphicsItem *parent);
 
  QPen outer_border_pen;
 
  qreal width = DDT_POINT_GRABBER_SIZE;
  qreal height = DDT_POINT_GRABBER_SIZE;
 
  int point_number = 0;
 
  int mouse_button_state = PointGrabber::PG_MOUSE_RELEASED;
};
 
#endif  // DDT_DATAVISUALISATION_UTILS_POINTGRABBER_HPP