simple-chat-client/lib/home/cubit/home_cubit.dart

/*
 * @Author       : Linloir
 * @Date         : 2022-10-13 14:02:28
 * @LastEditTime : 2022-10-17 19:26:13
 * @Description  : 
 */

import 'dart:async';

import 'package:bloc/bloc.dart';
import 'package:flutter/cupertino.dart';
import 'package:tcp_client/home/cubit/home_state.dart';
import 'package:tcp_client/repositories/local_service_repository/local_service_repository.dart';
import 'package:tcp_client/repositories/tcp_repository/models/tcp_response.dart';
import 'package:tcp_client/repositories/tcp_repository/tcp_repository.dart';

class HomeCubit extends Cubit<HomeState> {
  HomeCubit({
    required this.localServiceRepository,
    required this.tcpRepository,
    required this.pageController
  }): super(const HomeState(page: HomePagePosition.message)) {
    pageController.addListener(() {
      emit(state.copyWith(page: HomePagePosition.fromValue((pageController.page ?? 0).round())));
    });
    subscription = tcpRepository.responseStreamBroadcast.listen(_onTCPResponse);
  }

  final LocalServiceRepository localServiceRepository;
  final TCPRepository tcpRepository;
  final PageController pageController;
  late final StreamSubscription subscription;

  void switchPage(HomePagePosition newPage) {
    pageController.animateToPage(
      newPage.value, 
      duration: const Duration(milliseconds: 500), 
      curve: Curves.easeInOutCubicEmphasized
    );
  }

  void _onTCPResponse(TCPResponse response) {
    switch(response.type) {
      case TCPResponseType.forwardMessage: {
        response as ForwardMessageResponse;
        localServiceRepository.storeMessages([response.message]);
        break;
      }
      case TCPResponseType.fetchMessage: {
        response as FetchMessageResponse;
        localServiceRepository.storeMessages(response.messages);
        break;
      }
      default: {
        break;
      }
    }
  }

  @override
  Future<void> close() {
    subscription.cancel();
    return super.close();
  }
}