select<N extends StateNotifier<S>, S, R> method

@override R select<N extends StateNotifier<S>, S, R>(SelectFilteredProvider<N, S, R> filter)

read a Notifier from one provider and subscribe the widget to the changes of this Notifier.

target is a value gotten from .select or .when

the widget only will be rebuilded depending of the condition of each method.

Implementation

@override
R select<N extends StateNotifier<S>, S, R>(
  SelectFilteredProvider<N, S, R> filter,
) {
  // if the widget was rebuilded
  if (_isExternalBuild) {
    _clearDependencies();
  }
  _isExternalBuild = false;
  final notifier = filter.notifier;

  final insideDependencies = _builders.containsKey(notifier);
  // if there is not a listener for the current provider
  if (!insideDependencies) {
    filter.reaction = (_) => _rebuild();
    filter.createListener();
    // add the listener to the current notifier
    _builders[notifier] = filter.listener;
    _targets[notifier] = filter;
    notifier.addListener(filter.listener);
  }
  return (_targets[notifier] as SelectFilteredProvider)
      .selectValue; // coverage:ignore-line
}