demo/xinhuaribao/lib/provider/topic_provider.dart

import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:news_app/constant/api_const.dart';
import 'package:news_app/http/http_util.dart';
import 'package:news_app/model/topic_hot_model.dart';
import 'package:news_app/model/topic_item_model.dart';
import 'package:news_app/model/topic_rank_model.dart';

import '../http/model_parser.dart';

/// @author: bo.zeng
/// @email: cnhbwds@gmail.com
/// @date: 2025 2025/4/18 10:43
/// @description:
class TopicProvider extends Notifier<TopicData> {
  @override
  TopicData build() {
    return TopicData();
  }

  Future<void> fetchTopicHot() async {
    var jsonData = await HttpUtil().get(
      apiTopicHot,
      queryParameters: {"sid": "411683596922949"},
    );
    final newsList = ModelParser.parseList<TopicHotModel>(
      jsonData,
      TopicHotModel.fromJson,
    );

    //直接修改 state.topicHotList 不会触发状态更新。要确保通过 state = newState 来更新整个状态对象。
    state = state.copyWith(topicHotList: newsList);
  }

  Future<void> fetchRankHot() async {
    var jsonData = await HttpUtil().get(
      apiTopicRank,
      queryParameters: {"sid": "411683596922949", "pn": 0, "ps": 10},
    );
    final newsList = ModelParser.parseList<TopicRankModel>(
      jsonData,
      TopicRankModel.fromJson,
    );
    state = state.copyWith(topicRankList: newsList);
  }
}

class TopicData {
  final List<TopicHotModel> topicHotList;
  final List<TopicRankModel> topicRankList;

  TopicData({this.topicHotList = const [], this.topicRankList = const []});

  TopicData copyWith({
    List<TopicHotModel>? topicHotList,
    List<TopicRankModel>? topicRankList,
    TopicItemModel? topicItemModel,
  }) {
    return TopicData(
      topicHotList: topicHotList ?? this.topicHotList,
      topicRankList: topicRankList ?? this.topicRankList,
    );
  }
}