/// <summary>
/// This method places new _States inside the FSM,
/// or prints an ERROR message if the state was already inside the List.
/// First state added is also the initial state.
/// </summary>
public void AddState(BehaviourState s)
{
if (s == null)
{
Debug.LogError("FSM ERROR: Null reference is not allowed");
}
// First State inserted is also the Initial state,
// the state the machine is in when the simulation begins
if (_States.Count == 0)
{
_States.Add(s);
_CurState = s;
_CurStateID = s.ID;
_CurState.OnEnter();
return;
}
// Add the state to the List if it's not inside it
foreach (BehaviourState state in _States)
{
if (state.ID == s.ID)
{
Debug.LogError("FSM ERROR: Impossible to add state " + s.ID.ToString() +
" because state has already been added");
return;
}
}
_States.Add(s);
}
/// <summary>
/// 执行转换，外部调用关键方法。
/// </summary>
/// <param name="trans">Trans.</param>
public void PerformTransition(EBehaviourTransition trans, object param = null)
{
if (!CanTransition(trans))
{
return;
}
_CurStateID = _CurState.GetOutputState(trans);
foreach (BehaviourState state in _States)
{
if (state.ID == _CurStateID)
{
_CurState.OnExit();
_CurState = state;
_CurState.OnEnterBefore();
_CurState.OnEnter(param);
break;
}
}
}