ViewProfileDivider.h

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/******************************************************************************************************
 * (C) 2014 markummitchell@github.com. This file is part of Engauge Digitizer, which is released      *
 * under GNU General Public License version 2 (GPLv2) or (at your option) any later version. See file *
 * LICENSE or go to gnu.org/licenses for details. Distribution requires prior written permission.     *
 ******************************************************************************************************/
 
#ifndef VIEW_PROFILE_DIVIDER_H
#define VIEW_PROFILE_DIVIDER_H
 
#include <QGraphicsRectItem>
#include <QObject>
 
class QGraphicsLineItem;
class QGraphicsScene;
class QGraphicsPolygonItem;
class QGraphicsView;

class ViewProfileDivider : public QObject, public QGraphicsRectItem
{
  Q_OBJECT;
 
public:
  ViewProfileDivider (QGraphicsScene &scene,
                      QGraphicsView &view,
                      int sceneWidth,
                      int sceneHeight,
                      int yCenter,
                      bool isLowerBoundary);

  virtual QVariant itemChange (GraphicsItemChange change, const QVariant &value);

  virtual void mousePressEvent(QGraphicsSceneMouseEvent *event);

  void setX (double x,
             double xLow,
             double xHigh);
 
private slots:
  void slotOtherMoved(double xSceneOther);
 
signals:
  void signalMovedLow (double xSceneOther);

  void signalMovedHigh (double xSceneOther);
 
private:
  ViewProfileDivider ();
 
  void sendSignalMoved ();
 
  // Update geoemtries since one of the dividers (this or the other) moved
  void updateGeometryDivider ();
  void updateGeometryNonPaddle ();
  void updateGeometryPaddle ();
 
  QGraphicsView &m_view;
  int m_yCenter;
  double m_xScene; // X coordinae of this divider
  double m_xSceneOther; // X coordinate of other divider. Used when the two dividers have moved past each other so there
                        // are two unshaded areas
  QGraphicsLineItem *m_divider;
  QGraphicsRectItem *m_shadedArea;
  QGraphicsPolygonItem *m_arrow;
  int m_sceneWidth;
  int m_sceneHeight;
  bool m_isLowerBoundary;
 
  QPointF m_startDragPos;
};
 
#endif // VIEW_PROFILE_DIVIDER_H