DigitizeStateContext.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_CONTEXT_H
#define DIGITIZE_STATE_CONTEXT_H
 
#include "DigitizeStateAbstractBase.h"
#include "PointStyle.h"
#include <QCursor>
#include <QGraphicsView>
#include <QObject>
#include <QVector>
 
class CmdAbstractBase;
class DocumentModelDigitizeCurve;
class DocumentModelSegments;
class MainWindow;
class QUndoCommand;
 
class DigitizeStateContext : public QObject
{
  Q_OBJECT;
 
public:
  DigitizeStateContext(MainWindow &mainWindow,
                       QGraphicsView &view,
                       bool isGnuplot);
  virtual ~DigitizeStateContext ();
 
  QString activeCurve () const;
 
  void appendNewCmd(CmdMediator *cmdMediator,
                    QUndoCommand *cmd);
 
  void handleContextMenuEvent (CmdMediator *cmdMediator,
                               const QString &pointIdentifier);
 
  void handleCurveChange (CmdMediator *cmdMediator);
 
  void handleKeyPress (CmdMediator *cmdMediator,
                       Qt::Key key,
                       bool atLeastOneSelectedItem);
 
  void handleLeave (CmdMediator *cmdMediator);
 
  void handleMouseMove (CmdMediator *cmdMediator,
                        QPointF pos);
 
  void handleMousePress (CmdMediator *cmdMediator,
                         QPointF pos);
 
  void handleMouseRelease (CmdMediator *cmdMediator,
                           QPointF pos);
 
  void handleSetOverrideCursor (CmdMediator *cmdMediator,
                                const QCursor &cursor);
 
  bool isGnuplot () const;
 
  MainWindow &mainWindow ();
 
  const MainWindow &mainWindow () const;
 
  void requestDelayedStateTransition (DigitizeState digitizeState);
 
  void requestImmediateStateTransition (CmdMediator *cmdMediator,
                                        DigitizeState digitizeState);
 
  void resetOnLoad (CmdMediator *cmdMediator);
 
  void setCursor (CmdMediator *cmdMediator);
 
  void setDragMode (QGraphicsView::DragMode dragMode);
 
  void setImageIsLoaded (CmdMediator *cmdMediator,
                         bool imageIsLoaded);
 
  QString state() const;
 
  void updateModelDigitizeCurve (CmdMediator *cmdMediator,
                                 const DocumentModelDigitizeCurve &modelDigitizeCurve);
 
  void updateModelSegments(const DocumentModelSegments &modelSegments);
 
  QGraphicsView &view();
 
private:
  DigitizeStateContext();
 
  void completeRequestedStateTransitionIfExists (CmdMediator *cmdMediator);
 
  MainWindow &m_mainWindow;
  QGraphicsView &m_view;
  bool m_imageIsLoaded; // Cursor and dragging can be affected by whether or not image is loaded
 
  QVector<DigitizeStateAbstractBase*> m_states;
  DigitizeState m_currentState;
  DigitizeState m_requestedState; // Same as m_currentState until requestDelayedStateTransition is called
 
  bool m_isGnuplot;
};
 
#endif // DIGITIZE_STATE_CONTEXT_H