addDescendantStatesToEnter method

@visibleForTesting void addDescendantStatesToEnter(State<T> state)

Selects active descendents, substituting history values when necessary.

Implementation

@visibleForTesting
void addDescendantStatesToEnter(State<T> state) {
  if (state is HistoryState<T>) {
    final parent = state.parent!;
    if (history.contains(parent)) {
      final historyValue = history[parent]!;
      for (var s in historyValue) {
        addDescendantStatesToEnter(s);
      }
      for (var s in historyValue) {
        addAncestorStatesToEnter(s, state.parent);
      }
    } else {
      _defaultHistoryActions[state.parent!] = state.transition;
      for (var s in state.transition.targetStates) {
        addDescendantStatesToEnter(s);
      }
      for (var s in state.transition.targetStates) {
        addAncestorStatesToEnter(s, state.parent);
      }
    }
    return; // HistoryState
  }
  // Non-history state
  _statesToEnter.add(state);
  if (state.isParallel) {
    for (var child in state.substates) {
      if (!_statesToEnter.any((s) => s.descendsFrom(child))) {
        addDescendantStatesToEnter(child);
      }
    }
  } else if (state.isCompound) {
    _statesForDefaultEntry.add(state);
    for (var s in state.initialStates) {
      addDescendantStatesToEnter(s);
      addAncestorStatesToEnter(s, state);
    }
  }
}