ddtCornergrabber.hpp

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#ifndef DDT_DATAVISUALISATION_UTILS_CORNERGRABBER_HPP
#define DDT_DATAVISUALISATION_UTILS_CORNERGRABBER_HPP
 
#include <math.h>
#include <QGraphicsItem>
#include <QGraphicsSceneDragDropEvent>
#include <QPainter>
#include <QPen>
 
const int DDT_CORNER_GRABBER_SIZE = 20;
 
enum MouseStates {
  CG_MOUSE_RELEASED,
  CG_MOUSE_DOWN,
  CG_MOUSE_MOVING
};
 
class CornerGrabber : public QGraphicsItem {
 public:
  explicit CornerGrabber(QGraphicsItem *parent = nullptr, const int corner = 0);
 
  int GetCorner() const;
 
  void SetMouseState(const int state);
 
  int GetMouseState() const;
 
  qreal mouse_down_x;
 
  qreal mouse_down_y;
 
 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);
 
  QColor outer_border_color;
  QPen outer_border_pen;
 
  qreal width;
  qreal height;
 
  // 0,1,2,3: starting at x=0,y=0 and moving clockwise around the box
  int corner;
 
  int mouse_button_state;
};
 
#endif  // DDT_DATAVISUALISATION_UTILS_CORNERGRABBER_HPP