public ITextAction Redo()
{
ITextAction lastredo = redos.LastOrDefault();
if (lastredo != null)
{
undos.Add(lastredo);
}
return(lastredo);
}
public void Add(ITextAction action)
{
ITextAction lastundo = undos.LastOrDefault();
ITextAction concat = null;
if (lastundo is ITextUndoRedoAction && action is ITextUndoRedoAction)
{
concat = ((ITextUndoRedoAction)lastundo).Concat((ITextUndoRedoAction)action);
}
if (concat != null)
{
undos.RemoveAt(undos.Count() - 1);
undos.Add(concat);
}
else
{
undos.Add(action);
}
}
