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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.
*/
#include "history.h"
#include "puzzle.h"
using namespace Sudoku;
//--- class Sudoku::History ----------------------------------------------------
/** Constructor */
History::History()
{
executed = 0;
}
/** Destructor */
History::~History()
{
reset();
}
/** Reset the history. */
void History::reset()
{
for (unsigned int pos = history.size(); pos > 0; --pos)
{
// Remove object created outside of History
delete history.back();
history.pop_back();
}
executed = 0;
}
/** Current move in the history */
Move* History::current()
{
if (movesExecuted())
return history[executed - 1];
return 0;
}
/** Add a new move. */
void History::add(Move* move)
{
if (move)
{
for (unsigned int pos = history.size(); pos > executed; --pos)
{
// Remove object created outside of History
delete history.back();
history.pop_back();
}
history.push_back(move);
++executed;
}
}
/** Set previous move as current. */
void History::backward()
{
if (movesExecuted())
--executed;
}
/** Set next move as current. */
void History::forward()
{
if (movesToExecute())
++executed;
}
/** Are there executed moves in the history? */
bool History::movesExecuted() const
{
return executed > 0;
}
/** Are there moves to execute in the history? */
bool History::movesToExecute() const
{
return executed < history.size();
}
//--- class Sudoku::SetMove ----------------------------------------------------
/** Constructor */
SetMove::SetMove(PuzzleGame& puzzle, unsigned int number) :
puzzle(puzzle)
{
pos = puzzle.get_pos();
old_number = puzzle.get(pos);
new_number = number;
}
/** Do the move. */
void SetMove::execute()
{
puzzle.set(pos, new_number);
puzzle.set_pos(pos);
}
/** Undo the move. */
void SetMove::takeBack()
{
puzzle.set(pos, old_number);
puzzle.set_pos(pos);
}
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