demo/xinhuaribao/lib/provider/activity_provider.dart

import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:news_app/http/http_util.dart';
import 'package:news_app/http/model_parser.dart';
import 'package:news_app/model/activity_banner_model.dart';

import '../constant/api_const.dart';
import '../model/activity_model.dart';

class ActivityProvider extends Notifier<ActivityData> {
  @override
  ActivityData build() {
    return ActivityData();
  }

  Future<void> fetchActivityBanner() async {
    var jsonData = await HttpUtil().get(
      apiBannerList,
      queryParameters: {"type": "activity"},
    );

    final newList = ModelParser.parseList<ActivityBannerModel>(
      jsonData,
      ActivityBannerModel.fromJson,
    );
    state = state.copyWith(activityBannerList: newList);
  }


  Future<void> fetchActivityList({required int page}) async {
    var jsonData = await HttpUtil().get(
      apiActivityList,
      queryParameters: {"ps": 10, "pn": page},
    );

    final response = ModelParser.parseObject<ActivityModel>(
      jsonData,
      ActivityModel.fromJson,
    );
    final oldRecords = state.activityList?.records ?? [];
    state = state.copyWith(
      activityList: response.copyWith(
        total: response.total,
        size: response.size,
        current: response.current,
        pages: response.pages,
        records:
            page == 1
                ? response.records
                : [...oldRecords, ...?response.records],
      ),
    );
  }
}

class ActivityData {
  final List<ActivityBannerModel> activityBannerList;
  //final ActivityModel? activityVideoList;
  final ActivityModel? activityList;

  ActivityData({
    this.activityBannerList = const [],
   // this.activityVideoList,
    this.activityList,
  });

  ActivityData copyWith({
    List<ActivityBannerModel>? activityBannerList,
    ActivityModel? activityVideoList,
    ActivityModel? activityList,
  }) {
    return ActivityData(
      activityBannerList: activityBannerList ?? this.activityBannerList,
   //   activityVideoList: activityVideoList ?? this.activityVideoList,
      activityList: activityList ?? this.activityList,
    );
  }
}