// Discard redo stack if item is added to move history
public void AddItem(HistoryItem newItem)
{
Future = new Stack <HistoryItem>();
Past.Push(newItem);
CurrItem = Past.Peek();
}
public void Undo()
{
int currTurn = CurrItem.Turn;
int targetTurn = currTurn - 2;
while (Past.Count > 0 && currTurn != targetTurn)
{
Future.Push(Past.Pop());
if (Past.Count <= 0)
{
currTurn = 1;
}
else
{
CurrItem = Past.Peek();
currTurn = CurrItem.Turn;
}
}
// check if can revert
//if (Past.Count > 2)
//{
// Future.Push(Past.Pop());
// Future.Push(Past.Pop());
// CurrItem = Past.Peek();
//}
}
public void Redo()
{
int currTurn = CurrItem.Turn;
int targetTurn = currTurn + 2;
while (Future.Count > 0 && currTurn != targetTurn)
{
Past.Push(Future.Pop());
CurrItem = Past.Peek();
currTurn = CurrItem.Turn;
}
// check if can redo
//if (Future.Count > 1)
//{
// Past.Push(Future.Pop());
// Past.Push(Future.Pop());
// CurrItem = Past.Peek();
//}
}