DigitizeStateAbstractBase.h

/******************************************************************************************************
 * (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 DIGITIZE_STATE_ABSTRACT_BASE_H
#define DIGITIZE_STATE_ABSTRACT_BASE_H
 
#include "PointStyle.h"
#include <QCursor>
#include <QPointF>
 
class CmdMediator;
class DigitizeStateContext;
class DocumentModelDigitizeCurve;
class DocumentModelSegments;
class QGraphicsScene;
class QImage;
class QTimer;
 
enum DigitizeState {
  DIGITIZE_STATE_AXIS,
  DIGITIZE_STATE_COLOR_PICKER,
  DIGITIZE_STATE_CURVE,
  DIGITIZE_STATE_EMPTY,
  DIGITIZE_STATE_POINT_MATCH,
  DIGITIZE_STATE_SEGMENT,
  DIGITIZE_STATE_SELECT,
  NUM_DIGITIZE_STATES
};
 
class DigitizeStateAbstractBase
{
public:
  DigitizeStateAbstractBase(DigitizeStateContext &context);
  virtual ~DigitizeStateAbstractBase ();
 
  virtual QString activeCurve () const = 0;
 
  virtual void begin(CmdMediator *cmdMediator,
                     DigitizeState previousState) = 0;
 
  DigitizeStateContext &context();
 
  const DigitizeStateContext &context() const;
 
  virtual void end() = 0;
 
  void handleContextMenuEvent (CmdMediator *cmdMediator,
                               const QString &pointIdentifier);
 
  virtual void handleCurveChange (CmdMediator *cmdMediator) = 0;
 
  virtual void handleKeyPress (CmdMediator *cmdMediator,
                               Qt::Key key,
                               bool atLeastOneSelectedItem) = 0;
 
  virtual void handleLeave (CmdMediator *cmdMediator);
 
  virtual void handleMouseMove (CmdMediator *cmdMediator,
                                QPointF posScreen) = 0;
 
  virtual void handleMousePress (CmdMediator *cmdMediator,
                                 QPointF pos) = 0;
 
  virtual void handleMouseRelease (CmdMediator *cmdMediator,
                                   QPointF pos) = 0;
 
  void handleSetOverrideCursor (CmdMediator *cmdMediator,
                                const QCursor &cursor);
 
  void removeOverrideCursor ();
 
  void setCursor(CmdMediator *cmdMediator);
 
  virtual QString state() const = 0;
 
  virtual void updateModelDigitizeCurve (CmdMediator *cmdMediator,
                                         const DocumentModelDigitizeCurve &modelDigitizeCurve) = 0;
 
  virtual void updateModelSegments(const DocumentModelSegments &modelSegments) = 0;
 
protected:
  virtual QCursor cursor (CmdMediator *cmdMediator) const = 0;
 
private:
  DigitizeStateAbstractBase();
 
  DigitizeStateContext &m_context;
 
  bool m_isOverrideCursor; // Checking QApplication::overrideCursor()==0 is unreliable so this tracks the override cursor state
};
 
#endif // DIGITIZE_STATE_ABSTRACT_BASE_H