demo/xinhuaribao/lib/provider/msg_center_provider.dart

import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:news_app/constant/api_const.dart';
import 'package:news_app/extension/base.dart';
import 'package:news_app/model/msg_center_model.dart';

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

class MsgCenterLikeProvider extends FamilyNotifier<UserMsgLike, String> {
  String _type = "reply"; //reply  like

  @override
  UserMsgLike build(String type) {
    _type = type;
    return UserMsgLike();
  }

  Future<void> fetchMsgCenterLike({required int pageNum}) async {
    var jsonData = await HttpUtil().get(
      apiMsgCenter,
      queryParameters: {"type": _type, "pageSize": "10", "pageNum": pageNum},
    );

    final response = ModelParser.parseObject<UserMsgLike>(
      jsonData,
      UserMsgLike.fromJson,
    );
    state.total = response.total;
    if (pageNum == 0) {
      state = response;
    } else {
      //把新的列表添加到旧的列表中
      state = UserMsgLike(
        total: response.total,
        rows: [...state.rows ?? [], ...response.rows ?? []],
      );
    }
  }
}

class UserMsgLike {
  List<MsgCenterModelRows?>? rows;
  int? total;

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

  UserMsgLike.fromJson(Map<String, dynamic> json) {
    if (json['rows'] != null) {
      final v = json['rows'];
      final arr0 = <MsgCenterModelRows>[];
      v.forEach((v) {
        arr0.add(MsgCenterModelRows.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;
  }
}