public Command Undo()
{
if (_pos > 0)
{
_pos--;
Command cmd = this.Current;
if (cmd != null && !cmd.IsNoop)
{
Command saved = this._exec;
try
{
this._exec = cmd;
cmd.Undo();
}
finally
{
this._exec = saved;
}
if (StateChanged != null)
{
StateChanged(this, EventArgs.Empty);
}
if (CommandUndone != null)
{
CommandUndone(this, new CommandEventArgs(cmd));
}
}
return(cmd);
}
return(null);
}
public override void Undo()
{
// Must undo in reverse order!
for (int i = this.commands.Count - 1; i >= 0; i--)
{
Command cmd = this.commands[i];
cmd.Undo();
}
}