notes controller

notes.controller.dart

// We create a "provider", which will store a reference to NotesController.
final notesProvider = StateNotifierProvider((ref) => NotesController());

class NotesController extends StateNotifier<NotesState> {
  NotesController() : super(NotesState.initial());

  void addNote() {
    var notes = state.notes.concat(state.input);
    state = state.copyWith(notes: notes, input: '');
  }

  void updateInput(String input) => state = state.copyWith(input: input);
}