1 files changed, 131 insertions, 0 deletions
diff --git a/ksokoban/History.cpp b/ksokoban/History.cpp
new file mode 100644
index 00000000..4c73827d
--- /dev/null
+++ b/ksokoban/History.cpp
@@ -0,0 +1,131 @@
+/*
+ *  ksokoban - a Sokoban game for KDE
+ *  Copyright (C) 1998  Anders Widell  <awl@hem.passagen.se>
+ *
+ *  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 <qptrlist.h>
+
+#include "History.h"
+#include "Move.h"
+#include "MoveSequence.h"
+#include "LevelMap.h"
+
+History::History() {
+  past_.setAutoDelete(true);
+  future_.setAutoDelete(true);
+}
+
+
+void
+History::add(Move *_m) {
+  future_.clear();
+  past_.append(_m);
+}
+
+void
+History::clear() {
+  past_.clear();
+  future_.clear();
+}
+
+void
+History::save(QString &_str) {
+  Move *m = past_.first();
+
+  while (m != 0) {
+    m->save(_str);
+    m = past_.next();
+  }
+  _str += '-';
+
+  m = future_.first();
+  while (m != 0) {
+    m->save(_str);
+    m = future_.next();
+  }
+}
+
+const char *
+History::load(LevelMap *map, const char *_str) {
+  Move *m;
+  int x = map->xpos();
+  int y = map->ypos();
+
+  clear();
+  while (*_str != '\0' && *_str != '-') {
+    m = new Move(x, y);
+    _str = m->load(_str);
+    if (_str == 0) return 0;
+    x = m->finalX();
+    y = m->finalY();
+    past_.append(m);
+    if (!m->redo(map)) {
+      //printf("redo failed: %s\n", _str);
+      //abort();
+      return 0;
+    }
+  }
+  if (*_str != '-') return 0;
+
+  _str++;
+  while (*_str != '\0') {
+    m = new Move(x, y);
+    _str = m->load(_str);
+    if (_str == 0) return 0;
+    x = m->finalX();
+    y = m->finalY();
+    future_.append(m);
+  }
+
+  return _str;
+}
+
+bool
+History::redo(LevelMap *map) {
+  if (future_.isEmpty()) return false;
+
+  Move *m=future_.take(0);
+  past_.append(m);
+  return m->redo(map);
+}
+
+MoveSequence *
+History::deferRedo(LevelMap *map) {
+  if (future_.isEmpty()) return 0;
+
+  Move *m=future_.take(0);
+  past_.append(m);
+  return new MoveSequence(m, map);
+}
+
+bool
+History::undo(LevelMap *map) {
+  if (past_.isEmpty()) return false;
+
+  Move *m = past_.take(past_.count ()-1);
+  future_.insert(0, m);
+  return m->undo(map);
+}
+
+MoveSequence *
+History::deferUndo(LevelMap *map) {
+  if (past_.isEmpty()) return 0;
+
+  Move *m = past_.take(past_.count()-1);
+  future_.insert(0, m);
+  return new MoveSequence(m, map, true);
+}