/// <summary>
/// save surrent state for undo
/// </summary>
/// <param name="state"></param>
public void SaveCurrentState(T state)
{
if (undoStatck == null)
{
undoStatck = new List <T>();
}
if (undoPointer < 0 || undoStatck.Count == 0)
{
undoPointer = -1;
undoStatck.Insert(0, (T)state.Clone());
newState = false;
}
else
{
if (newState)
{
newState = false;
undoStatck.Insert(undoPointer, (T)state.Clone());
}
else
{
newState = true;
}
}
_owner.FireStateChange();
}