CmdAbstract.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 CMD_ABSTRACT_H
#define CMD_ABSTRACT_H
 
#include "PointIdentifiers.h"
#include <QUndoCommand>
 
class Document;
class MainWindow;
class QXmlStreamWriter;
 
class CmdAbstract : public QUndoCommand
{
public:
  CmdAbstract(MainWindow &mainWindow,
              Document &document,
              const QString &cmdDescription);
 
  virtual ~CmdAbstract();
 
  virtual void cmdRedo () = 0;
 
  virtual void cmdUndo () = 0;
 
  virtual void saveXml (QXmlStreamWriter &writer) const = 0;
 
protected:
  Document &document();
 
  const Document &document() const;
 
  MainWindow &mainWindow ();
 
  void resetSelection(const PointIdentifiers &pointIdentifiersToSelect);
 
private:
  CmdAbstract();
 
  virtual void redo (); // Calls cmdRedo
  virtual void undo (); // Calls cmdUndo
 
  MainWindow &m_mainWindow;
  Document &m_document;
 
  // Snapshots of GraphicsPointAbstractBase::identifierIndex before and after redo
  bool m_isFirstRedo;
  unsigned int m_identifierIndexBeforeRedo;
  unsigned int m_identifierIndexAfterRedo;
};
 
#endif // CMD_ABSTRACT_H