huixiang_app/lib/article/hot_article_item.dart

import 'package:dio/dio.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:huixiang/generated/l10n.dart';
import 'package:huixiang/retrofit/data/article.dart';
import 'package:huixiang/retrofit/data/base_data.dart';
import 'package:huixiang/retrofit/data/page.dart';
import 'package:huixiang/retrofit/retrofit_api.dart';
import 'package:huixiang/view_widget/classic_header.dart';
import 'package:huixiang/view_widget/hot_item.dart';
import 'package:huixiang/view_widget/my_footer.dart';
import 'package:pull_to_refresh/pull_to_refresh.dart';
import 'package:shared_preferences/shared_preferences.dart';

class HotArticlePage extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return _HotArticlePage();
  }
}

class _HotArticlePage extends State<HotArticlePage> {
  ApiService apiService;

  @override
  void initState() {
    super.initState();

    SharedPreferences.getInstance().then((value) => {
          apiService =  ApiService(Dio(), context: context, token: value.getString("token")),
          queryArticle(),
        });
  }

  int pageNum = 1;
  RefreshController refreshController = RefreshController();

  _onRefresh() {
    pageNum = 1;
    queryArticle();
  }

  List<Article> articles = [];

  queryArticle() async {
    BaseData baseData = await apiService.queryArticle({
      "pageNum": pageNum,
      "pageSize": 10,
      "searchKey": "",
      "state": 1,
      "type": 2
    }).catchError((onError){
      refreshController.refreshFailed();
      refreshController.loadFailed();
    });
    if (baseData != null && baseData.isSuccess) {
      PageInfo pageInfo = PageInfo.fromJson(baseData.data);
      refreshController.refreshCompleted();
      refreshController.loadComplete();
      if(pageNum == 1) {
        articles.clear();
      }
      articles.addAll(pageInfo.list.map((e) => Article.fromJson(e)).toList());
      if (pageInfo.pageNum == pageInfo.pages) {
        refreshController.loadNoData();
      } else {
        pageNum += 1;
      }
      setState(() {});
    } else {
      refreshController.refreshFailed();
      refreshController.loadFailed();
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Color(0xFFF7F7F7),
        elevation: 0,
        title: Text(
          S.of(context).huixiangtoutiao,
          style: TextStyle(
            color: Colors.black,
            fontWeight: FontWeight.bold,
          ),
        ),
        centerTitle: false,
        leading: GestureDetector(
          onTap: () {
            Navigator.of(context).pop();
          },
          child: Container(
            alignment: Alignment.centerRight,
            margin: EdgeInsets.only(left: 10),
            padding: EdgeInsets.all(6),
            child: Icon(
              Icons.arrow_back_ios,
              color: Colors.black,
              size: 24,
            ),
          ),
        ),
        titleSpacing: 2,
        leadingWidth: 56,
      ),
      body: Container(
        child: SmartRefresher(
          controller: refreshController,
          enablePullDown: true,
          enablePullUp: true,
          physics: BouncingScrollPhysics(),
          header: MyHeader(),
          footer: CustomFooter(
            builder: (context, mode) {
              return MyFooter(mode);
            },
          ),
          onRefresh: _onRefresh,
          onLoading: queryArticle,
          child: ListView.builder(
            itemCount: articles.length,
            physics: NeverScrollableScrollPhysics(),
            scrollDirection: Axis.vertical,
            itemBuilder: (context, position) {
              return AspectRatio(
                aspectRatio: 2.47,
                child: Container(
                  height: 130,
                  margin: EdgeInsets.symmetric(vertical: 8, horizontal: 16),
                  child: HotArticleItem(article: articles[position]),
                ),
              );
            },
          ),
        ),
      ),
    );
  }
}