protected virtual void OnStateChange(StateChangeEventArgs e)
{
if (StateChange != null)
{
StateChange(this, e);
}
return;;
}
public void SetState(State state)
{
StateChangeEventArgs e =
new StateChangeEventArgs(
name_, "SET", state_, state);
#if TRACE
Trace.WriteLine("ENTER STATE : " + state.Name);
#endif
state_ = state;
OnStateChange(e);
return;
}
public void PopState()
{
if (stateStack_.Count == 0)
{
#if TRACE
Trace.WriteLine("POPPING ON EMPTY STATE STACK.");
#endif
throw new
System.InvalidOperationException(
"popping an empty state stack");
}
else
{
State nextState = (State) stateStack_.Pop();
StateChangeEventArgs e =
new StateChangeEventArgs(
name_, "POP", state_, nextState);
// The pop method removes the top element
// from the stack and returns it.
state_ = nextState;
#if TRACE
Trace.WriteLine("POP TO STATE : " + state_.Name);
#endif
OnStateChange(e);
}
return;
}
public void PushState(State state)
{
StateChangeEventArgs e =
new StateChangeEventArgs(
name_, "PUSH", state_, state);
#if TRACE
Trace.WriteLine("PUSH TO STATE : " + state.Name);
#endif
if (state_ != null)
{
stateStack_.Push(state_);
}
state_ = state;
OnStateChange(e);
return;
}
public void SetState(State state)
{
StateChangeEventArgs e =
new StateChangeEventArgs(
name_, "SET", state_, state);
#if TRACE
Trace.WriteLine("ENTER STATE : " + state.Name);
#endif
// clearState() is not called when a transition has
// no actions, so set _previousState to _state in
// that situation. We know clearState() was not
// called when _state is not null.
if (state_ != null)
{
previousState_ = state_;
}
state_ = state;
OnStateChange(e);
return;
}
