onUpdate method

@override void onUpdate(double dt)

Fires onEnter (if not already fired for this state), evaluates transitions, fires onExit when leaving, then calls onUpdate for whichever state is current after any transition.

Implementation

@override
void onUpdate(double dt) {
  if (!_started || _current == null) return;

  final currentDef = _states[_current]!;

  if (!_entered) {
    _entered = true;
    currentDef.onEnter?.call();
  }

  // Evaluate transitions out of the current state, first match wins.
  for (final t in _transitions) {
    if (t.from != _current) continue;
    if (t.when()) {
      currentDef.onExit?.call();
      _current = t.to;
      _timeInState = 0;
      _entered = false;
      _states[t.to]!.onEnter?.call();
      _entered = true;
      break; // only one transition per frame
    }
  }

  _timeInState += dt;
  _states[_current]!.onUpdate?.call(dt);
}