public My_Picture Undo()
{
int index = history.IndexOf(current);
if (index > 0)
{
current = history.ElementAt <My_Picture>(index - 1);
}
return(current.Clone());
}
public void add(My_Picture item)
{
int index = history.IndexOf(current);
current = item.Clone();
if (index == history.Count - 1)
{
history.Add(current);
return;
}
history.RemoveRange(index + 1, (history.Count - index - 1));
history.Add(current);
}
public My_Picture ReDo()
{
int index = history.IndexOf(current);
if (index == history.Count - 1)
{
current = history.Last <My_Picture>();
}
if (index == -1)
{
current = history.First <My_Picture>();
}
current = history.ElementAt <My_Picture>(index + 1);
return(current.Clone());
}