ddtCornergrabber.hpp

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// @copyright
// (c) Copyright ESO 2020
// All Rights Reserved
// ESO (eso.org) is an Intergovernmental Organization, and therefore special
// legal conditions apply.
//
// @file ddtCornergrabber.hpp
// @brief Corner grabber for resizable graphical elements
//
// Class for the corners of resizable graphical elements
//
// @author Carsten Mannel, CGI
// @since  2021/03/16
//
 
#ifndef DDT_DATAVISUALISATION_UTILS_CORNERGRABBER_HPP
#define DDT_DATAVISUALISATION_UTILS_CORNERGRABBER_HPP
 
#include <QGraphicsItem>
#include <QPen>
 
const int DDT_CORNER_GRABBER_SIZE = 8;
 
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;
 
  enum { CG_MOUSE_RELEASED = 0, CG_MOUSE_DOWN, CG_MOUSE_MOVING };
 
 private:
  virtual QRectF boundingRect() const;
 
  virtual void paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
                     QWidget *widget);
 
  virtual void hoverEnterEvent(QGraphicsSceneHoverEvent *event);
 
  virtual void hoverLeaveEvent(QGraphicsSceneHoverEvent *event);
 
  virtual void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
  virtual void mouseMoveEvent(QGraphicsSceneDragDropEvent *event);
  virtual void mousePressEvent(QGraphicsSceneMouseEvent *event);
  virtual void mousePressEvent(QGraphicsSceneDragDropEvent *event);
  virtual void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
 
  QColor outter_border_color;
  QPen outter_border_pen;
 
  qreal width;
  qreal height;
 
  int corner;  // 0,1,2,3  - starting at x=0,y=0 and moving clockwise around
               // the box
 
  int mouse_button_state;
};
 
#endif  // DDT_DATAVISUALISATION_UTILS_CORNERGRABBER_HPP