public void Undo(int levels)
{
writer.Write(string.Format("\n---- Undo {0} levels ", levels));
// Perform undo operations
for (int i = 0; i < levels; i++)
{
if (_current > 0)
{
Command_Calculator command = _commands[--_current] as Command_Calculator;
command.UnExecute();
}
}
}
public void Redo(int levels)
{
writer.Write(string.Format("\n---- Redo {0} levels ", levels));
// Perform redo operations
for (int i = 0; i < levels; i++)
{
if (_current < _commands.Count - 1)
{
Command_Calculator command = _commands[_current++];
command.Execute();
}
}
}