// called when the state is changed.
// for the step observer, it is called when the step is completed.
public override void OnStateChange()
{
// Checklist cl = step.GetChecklist();
Checklist cl = step.checklist;
// if the current step is set to the observer, then the step is complete.
if (subject.GetStateNumber() == stepEndState && cl.GetCurrentStep() == step)
{
// the step has been completed.
cl.CompleteStep();
}
}
