CentipedeStateContext.h

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/******************************************************************************************************
 * (C) 2020 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 CENTIPEDE_STATE_CONTEXT_H
#define CENTIPEDE_STATE_CONTEXT_H
 
#include "CentipedeState.h"
#include "DocumentModelCoords.h"
#include "DocumentModelGuideline.h"
#include <QPointF>
#include <QVector>
 
class CentipedeStateAbstractBase;
class CmdMediator;
class DigitizeStateGuideline;
class GraphicsScene;
class MainWindow;
class Transformation;

class CentipedeStateContext
{
public:
  CentipedeStateContext (DigitizeStateGuideline &stateGuideline);
  virtual ~CentipedeStateContext ();

  void createGuidelineCommand (bool selectedXTFinal,
                               double valueFinal);

  GraphicsScene *graphicsScene () const;
  
  virtual void handleKeyPress (Qt::Key key,
                               bool atLeastOneSelectedItem);
  virtual void handleMouseMove (QPointF posScreen);
  virtual void handleMousePress (GraphicsScene *scene,
                                 const Transformation &transformation,
                                 const DocumentModelGuideline &modelGuideline,
                                 const DocumentModelCoords &modelCoords,
                                 QPointF posScreen,
                                 bool clickedOnItem);
  virtual void handleMouseRelease (QPointF posScreen);

  DocumentModelCoords modelCoords () const;
  
  DocumentModelGuideline modelGuideline () const;

  QPointF posClickScreen () const;
  
  void requestDelayedStateTransition (CentipedeState centipedeState);
  
  void requestImmediateStateTransition (CentipedeState centipedeState);

  GraphicsScene &scene () const;

  Transformation transformation () const;
  
private:
 
  void completeRequestedStateTransitionIfExists ();
 
  // State machine
  QVector<CentipedeStateAbstractBase*> m_states;
  CentipedeState m_currentState;
  CentipedeState m_requestedState; // Same as m_currentState until requestDelayedStateTransition is called
 
  // Owning state
  DigitizeStateGuideline &m_stateGuideline;
 
  // Variables for creating graphics items. Values are forwarded through handleKeyPress
  GraphicsScene *m_scene;
  Transformation *m_transformation;
  DocumentModelGuideline m_modelGuideline;
  DocumentModelCoords m_modelCoords;
  QPointF m_posClickScreen;
};
 
#endif // CENTIPEDE_STATE_CONTEXT_H