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+/*
+ * Sudoku: A plug-in for the Video Disk Recorder
+ *
+ * Copyright (C) 2008, 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.
+ *
+ * $Id: history.cpp 140 2008-06-30 22:10:38Z tom $
+ */
+
+#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()
+{
+  return history[executed - 1];
+}
+
+/** Add a new move */
+void History::add(Move* 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()
+{
+  return executed > 0;
+}
+
+/** Are there moves to execute in the history */
+bool History::movesToExecute()
+{
+  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);
+}