// 下棋
public static void Play(Chessman chess)
{
// 保存备忘录
mementoCaretaker.SetMemento(chess.Save());
index++;
Console.WriteLine("棋子 {0} 当前位置为 第 {1} 行 第 {2} 列", chess.Label, chess.X, chess.Y);
}
// 撤销悔棋
public static void Redo(Chessman chess, int i)
{
Console.WriteLine("---------- Sorry，撤销悔棋 ---------");
index++;
// 恢复到下一个备忘录
chess.Restore(mementoCaretaker.GetMemento(i + 1));
Console.WriteLine("棋子 {0} 当前位置为 第 {1} 行 第 {2} 列", chess.Label, chess.X, chess.Y);
}
// 悔棋
public static void Undo(Chessman chess, int i)
{
Console.WriteLine("---------- Sorry，俺悔棋了 ---------");
index--;
// 撤销到上一个备忘录
chess.Restore(mementoCaretaker.GetMemento(i - 1));
Console.WriteLine("棋子 {0} 当前位置为 第 {1} 行 第 {2} 列", chess.Label, chess.X, chess.Y);
}
public static void MultiRedoDemo()
{
Chessman chess = new Chessman("车", 1, 1);
Play(chess);
chess.Y = 4;
Play(chess);
chess.X = 5;
Play(chess);
Undo(chess, index);
Undo(chess, index);
Redo(chess, index);
Redo(chess, index);
}
public static void SingleRedoDemo()
{
MementoCaretaker mc = new MementoCaretaker();
Chessman chess = new Chessman("车", 1, 1);
Display(chess);
// 保存状态
mc.Memento = chess.Save();
chess.Y = 4;
Display(chess);
// 保存状态
mc.Memento = chess.Save();
Display(chess);
chess.X = 5;
Display(chess);
Console.WriteLine("---------- Sorry，俺悔棋了 ---------");
// 恢复状态
chess.Restore(mc.Memento);
Display(chess);
}
public static void Display(Chessman chess)
{
Console.WriteLine("棋子 {0} 当前位置为：第 {1} 行 第 {2} 列", chess.Label, chess.X, chess.Y);
}
