demo/xinhuaribao/lib/provider/search_provider.dart

import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:news_app/extension/base.dart';
import 'package:news_app/model/hot_word_model.dart';
import '../constant/api_const.dart';
import '../http/http_util.dart';
import '../http/model_parser.dart';
import '../model/news_data_model.dart';

class SearchProvider extends Notifier<SearchData> {
  @override
  SearchData build() {
    return SearchData();
  }

  Future<void>fetchArticleHotWord(String type) async{
    var jsonData = await HttpUtil().get(
      apiHotWord,
      queryParameters: {"q": type},
    );

    final newList = ModelParser.parseList<HotWordModel>(
      jsonData,
      HotWordModel.fromJson,
    );
    state = state.copyWith(hotWords: newList);

  }

  Future<void> fetchSearch(String keyword, int pageNum) async {
    final jsonData = await HttpUtil().get(
      apiSearch,
      queryParameters: {
        "q": keyword,
        "pageSize": 10.toString(),
        "pageNum": pageNum.toString(),
      },
    );
    final response = ModelParser.parseObject<SearchModel>(
      jsonData,
      SearchModel.fromJson,
    );
    if (pageNum == 0) {
      state = state.copyWith(searchModel: response);
    } else {
      //把新的列表添加到旧的列表中
      state = state.copyWith(searchModel: SearchModel(
        total: response.total,
        rows: [...state.searchModel?.rows ?? [], ...response.rows ?? []],
      ));
    }
  }
}


class SearchData{
  final SearchModel? searchModel;
  final List<HotWordModel> hotWords;
  SearchData({
    this.searchModel,
    this.hotWords = const [],
  });
  SearchData copyWith({
    SearchModel? searchModel,
    List<HotWordModel>? hotWords,
  }){
    return SearchData(
      searchModel:searchModel ?? this.searchModel,
      hotWords:hotWords ?? this.hotWords,
    );
  }
}


class SearchModel {
  List<NewsRecord?>? rows;
  int? total;

  SearchModel({this.rows, this.total});

  SearchModel.fromJson(Map<String, dynamic> json) {
    if (json['rows'] != null) {
      final v = json['rows'];
      final arr0 = <NewsRecord>[];
      v.forEach((v) {
        arr0.add(NewsRecord.fromJson(v));
      });
      rows = arr0;
    }
    total = json['total']?.toString().convertInt;
  }

  Map<String, dynamic> toJson() {
    final data = <String, dynamic>{};
    if (rows != null) {
      final v = rows;
      final arr0 = [];
      for (var v in v!) {
        arr0.add(v!.toJson());
      }
      data['rows'] = arr0;
    }
    data['total'] = total;
    return data;
  }
}