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/*
* Sudoku: A plug-in for the Video Disk Recorder
*
* Copyright (C) 2008-2010, Thomas Günther <tom@toms-cafe.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef VDR_SUDOKU_HISTORY_H
#define VDR_SUDOKU_HISTORY_H
#include "sudoku.h"
namespace Sudoku
{
class PuzzleGame;
class Pos;
class Move;
typedef Vector<Move*> Moves;
//--- class Sudoku::History --------------------------------------------------
class History
{
private:
Moves history;
unsigned int executed;
public:
/** Constructor */
History();
/** Destructor */
~History();
/** Reset the history. */
void reset();
/** Current move in the history */
Move* current();
/** Add a new move. */
void add(Move* move);
/** Set previous move as current. */
void backward();
/** Set next move as current. */
void forward();
/** Are there executed moves in the history? */
bool movesExecuted() const;
/** Are there moves to execute in the history? */
bool movesToExecute() const;
};
//--- class Sudoku::Move -----------------------------------------------------
class Move
{
public:
/** Destructor */
virtual ~Move() {};
/** Do the move. */
virtual void execute() = 0;
/** Undo the move. */
virtual void takeBack() = 0;
};
//--- class Sudoku::SetMove --------------------------------------------------
class SetMove : public Move
{
private:
PuzzleGame& puzzle;
unsigned int pos;
unsigned int old_number;
unsigned int new_number;
public:
/** Constructor */
SetMove(PuzzleGame& puzzle, unsigned int number);
/** Do the move. */
void execute();
/** Undo the move. */
void takeBack();
};
} // namespace Sudoku
#endif // VDR_SUDOKU_HISTORY_H
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