demo/xinhuaribao/lib/provider/news_detail_provider.dart

import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:news_app/constant/api_const.dart';

import '../http/http_util.dart';
import '../http/model_parser.dart';
import '../model/news_detail_model.dart';
import '../ui/me/user_favorite_page.dart';

class NewsDetailProvider extends AutoDisposeNotifier<NewsDetailModel> {
  @override
  NewsDetailModel build() {
    return NewsDetailModel();
  }

  Future<void> fetchNewsDetail(String contentId) async {
    var jsonData = await HttpUtil().get(
      apiNewsDetail,
      //视频固定展示4个
      queryParameters: {"contentId": contentId},
    );

    final response = ModelParser.parseObject<NewsDetailModel>(
      jsonData,
      NewsDetailModel.fromJson,
    );
    state = response;
  }

  Future<void> fetchNewsShare({required String? contentId}) async {
    if (contentId == null || contentId.isEmpty) {
      return;
    }
    await HttpUtil().get(
      apiNewsShare,
      queryParameters: {"contentId": contentId},
    );
  }

  Future<void> fetchNewsLike({
    required String? contentId,
    required bool current,
  }) async {
    if (contentId == null || contentId.isEmpty) {
      return;
    }
    final jsonData = await HttpUtil().get(
      current ? apiNewsCancelLike : apiNewsLike,
      queryParameters: {"contentId": contentId},
    );
    if (jsonData == true) {
      if (current) {
        state = state.copyWith(
          likeCount: (state.likeCount ?? 1) - 1, //默认1是为了防止出现负数
          isLiked: false,
        );
      } else {
        //修改成功后，把 likeCount+1
        state = state.copyWith(
          likeCount: (state.likeCount ?? 0) + 1,
          isLiked: true,
        );
      }
    }
  }

  Future<void> fetchNewsFavorite({
    required String? contentId,
    required bool current,
  }) async {
    if (contentId == null || contentId.isEmpty) {
      return;
    }
    final jsonData = await HttpUtil().get(
      current ? apiNewsCancelFavorite : apiNewsFavorite,
      queryParameters: {"contentId": contentId},
    );
    if (jsonData == true) {
      //修改成功后，把favoriteCount+1
      if (current) {
        //修改成功后，把favoriteCount-1
        state = state.copyWith(
          favoriteCount: (state.favoriteCount ?? 1) - 1, //默认1是为了防止出现负数
          isFavorite: false,
        );
        ref
            .read(favoriteNewsProvider.notifier)
            .removeItemByContentId(contentId);
      } else {
        state = state.copyWith(
          favoriteCount: (state.favoriteCount ?? 0) + 1,
          isFavorite: true,
        );
      }
    }
  }
}