/// <summary>
/// Does/Redoes the command</summary>
public override void Do()
{
for (int i = 0; i < m_commands.Count; ++i)
{
Command command = m_commands[i];
// if a command can't be completed successfully, back up to consistent state
bool success = false;
try
{
command.Do();
success = true;
}
finally
{
if (!success)
{
for (--i; i >= 0; --i)
{
Command done = m_commands[i];
done.Undo();
}
}
}
}
}
/// <summary>
/// Undo the last "done" command</summary>
/// <returns>Last Command done</returns>
public Command Undo()
{
if (!CanUndo)
{
throw new InvalidOperationException("Can't undo");
}
Command command = m_commands[m_commandCount.Current - 1];
m_commandCount.Decrement();
command.Undo();
OnCommandUndone();
return(command);
}
