public U Undo()
{
if (tempMemento != null)
{
throw new InvalidOperationException("The complex memento wasn't commited.");
}
inUndoRedo = true;
IListTOfVMemento <T, U> top = undoStack.Pop();
redoStack.Push(top.Restore(subject));
inUndoRedo = false;
return(top.GetChild());
}
public void CheckPoint(IListTOfVMemento <T, U> m)
{
if (inUndoRedo)
{
throw new InvalidOperationException("Involking do within an undo/redo action.");
}
if (tempMemento == null)
{
_Do(m);
}
else
{
tempMemento.Add(m);
}
}
public void Add(IListTOfVMemento <T, U> m)
{
mementos.Add(m);
}
private void _Do(IListTOfVMemento <T, U> m)
{
redoStack.Clear();
undoStack.Push(m);
}
