app/lib/paegs/guest_login_page/home_page.dart

import 'dart:convert';

import 'package:bbyyy/beans/tourist_goods_bean_entity.dart';
import 'package:bbyyy/beans/tourist_public_shop_bean_entity.dart';
import 'package:bbyyy/https/MyDio.dart';
import 'package:bbyyy/https/url.dart';
import 'package:bbyyy/my_tools/event_bus.dart';
import 'package:bbyyy/my_tools/my_colors.dart';
import 'package:bbyyy/my_tools/my_tools.dart';
import 'package:bbyyy/my_tools/my_views.dart';
import 'package:bbyyy/paegs/root_page/root_page_view.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter_svg/flutter_svg.dart';
import 'package:flutter_swiper/flutter_swiper.dart';
import 'package:pull_to_refresh/pull_to_refresh.dart';

class HomePage1 extends StatefulWidget {
  @override
  _HomePage1State createState() => _HomePage1State();
}

class _HomePage1State extends State<HomePage1>
    with AutomaticKeepAliveClientMixin {
  var imgs = ['images/banner1.png', 'images/banner2.png', 'images/banner3.png'];
  int selectedIndex = 0;
  var tabs = ['全部'];
  var types = ['货帮', '货品'];
  List<DropdownMenuItem<String>> sortItems = [];
  int typeIndex = 1;

  ScrollController _controller = ScrollController();
  double maxH;
  double minH = 164;
  double H = 0;
  bool showInput = false;
  TextEditingController _description = TextEditingController();
  FocusNode _descriptionFocus = FocusNode();

  RefreshController _reController = RefreshController(initialRefresh: true);
  int page = 1;
  int pageIndex = 0;
  List<TouristPublicShopBeanData> shops = [];
  List<TouristGoodsBeanData> goods = [];

  @override
  void initState() {
    super.initState();
    EventBus().on('toTop', (arg) {
      _controller.animateTo(0.0,
          duration: Duration(milliseconds: 200), curve: Curves.easeIn);
    });
    _controller.addListener(() {
      setState(() {
        if (_controller.offset == 0) {
          RootPageView().toTop = false;
          EventBus().emit('ChangePage');
        } else {
          RootPageView().toTop = true;
          EventBus().emit('ChangePage');
        }
        H = maxH - _controller.offset;
        if (H < minH) {
          H = minH;
        } else if (H > maxH) {
          H = maxH;
        }
      });
    });
    _descriptionFocus.addListener(() {
      if (_descriptionFocus.hasFocus) {
      } else {
        if (_description.text.isEmpty) {
          showInput = false;
        }
      }
    });
  }

  @override
  void dispose() {
    // TODO: implement dispose
    super.dispose();
    EventBus().off('commodity_category');
    EventBus().off('uploadGoods');
    EventBus().off('toTop');
  }

  @override
  Widget build(BuildContext context) {
    maxH = MediaQuery.of(context).size.width * (520 / 750);
    minH = MediaQuery.of(context).padding.top + 64;
    if (H == 0) {
      H = maxH;
    }
    return GestureDetector(
      onTap: () {
        MyTools().hideKeyboard(context);
      },
      behavior: HitTestBehavior.translucent,
      child: Scaffold(
        body: Column(
          children: [
            Stack(
              children: [
                AnimatedContainer(
                  height: H,
                  duration: Duration(milliseconds: 200),
                  child: Swiper(
                    itemBuilder: (BuildContext context, int index) {
                      return new Image.asset(
                        "${imgs[index]}",
                        fit: BoxFit.cover,
                      );
                    },
                    itemCount: 3,
                    viewportFraction: 1,
                    scale: 1,
                    autoplay: true,
                  ),
                ),
                SafeArea(
                  child: Container(
                    margin: EdgeInsets.only(top: 18),
                    width: double.infinity,
                    child: Row(
                      children: [
                        GestureDetector(
                          onTap: () {
                            setState(() {
                              pageIndex = 0;
                              _reController.requestRefresh();
                            });
                          },
                          behavior: HitTestBehavior.translucent,
                          child: Container(
                            height: 28,
                            width: 60,
                            alignment: Alignment.center,
                            child: Column(
                              children: [
                                Text(
                                  '店铺',
                                  style: TextStyle(
                                      color: pageIndex == 0
                                          ? MyColors.cFF4233
                                          : MyColors.c333333,
                                      fontSize: 16,
                                      fontWeight: FontWeight.bold),
                                ),
                                Visibility(
                                  child: Container(
                                    width: 32,
                                    height: 2,
                                    decoration: BoxDecoration(
                                        color: MyColors.cFF4233,
                                        borderRadius: BorderRadius.circular(1)),
                                  ),
                                  visible: pageIndex == 0,
                                ),
                              ],
                            ),
                          ),
                        ),
                        Container(
                          width: 40,
                        ),
                        GestureDetector(
                          onTap: () {
                            setState(() {
                              pageIndex = 1;
                              _reController.requestRefresh();
                            });
                          },
                          behavior: HitTestBehavior.translucent,
                          child: Container(
                            height: 28,
                            width: 60,
                            alignment: Alignment.center,
                            child: Column(
                              children: [
                                Text(
                                  '商品',
                                  style: TextStyle(
                                      color: pageIndex == 1
                                          ? MyColors.cFF4233
                                          : MyColors.c333333,
                                      fontSize: 16,
                                      fontWeight: FontWeight.bold),
                                ),
                                Visibility(
                                  child: Container(
                                    width: 32,
                                    height: 2,
                                    decoration: BoxDecoration(
                                        color: MyColors.cFF4233,
                                        borderRadius: BorderRadius.circular(1)),
                                  ),
                                  visible: pageIndex == 1,
                                ),
                              ],
                            ),
                          ),
                        ),
                      ],
                      mainAxisAlignment: MainAxisAlignment.center,
                    ),
                  ),
                ),
                SafeArea(
                  child: Container(
                    margin: EdgeInsets.only(top: 18),
                    width: double.infinity,
                    child: GestureDetector(
                      onTap: (){
                        EventBus().emit('toLogin');
                      },
                      child: Container(
                        decoration: BoxDecoration(
                            color: MyColors.cFF4233,
                            borderRadius: BorderRadius.circular(14)),
                        height: 28,
                        width: 28,
                        child: SvgPicture.asset(
                          'images/svg/搜索.svg',
                          height: 15,
                          width: 15,
                          color: Colors.white,
                        ),
                        alignment: Alignment.center,
                        margin: EdgeInsets.only(right: 15),
                      ),
                    ),
                    alignment: Alignment.centerRight,
                  ),
                ),
              ],
            ),
            Expanded(
              flex: 1,
              child: SmartRefresher(
                controller: _reController,
                onRefresh: onRefresh,
                onLoading: onLoading,
                enablePullDown: true,
                enablePullUp: true,
                child: body(),
              ),
            )
          ],
        ),
      ),
    );
  }

  @override
  // TODO: implement wantKeepAlive
  bool get wantKeepAlive => true;

  void onRefresh() {
    page = 1;
    touristQueryData();
  }

  void onLoading() {
    page++;
    touristQueryData();
  }

  body() {
    if (pageIndex == 1) {
      return body1();
    } else if (pageIndex == 0) {
      return body2();
    }
  }

  body1() {
    double w = (MediaQuery.of(context).size.width - 28 - 8) / 2;
    if (goods.length == 0) {
      return noData();
    } else {
      return GridView.builder(
          controller: _controller,
          gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
              crossAxisCount: 2,
              childAspectRatio: 164 / 261,
              mainAxisSpacing: 8,
              crossAxisSpacing: 8),
          itemCount: goods.length,
          padding: EdgeInsets.only(left: 14, right: 14, top: 14, bottom: 65),
          itemBuilder: (context, index) {
            return GestureDetector(
              onTap: () {
                EventBus().emit('toLogin');
              },
              behavior: HitTestBehavior.translucent,
              child: Card(
                elevation: 2,
                shadowColor: MyColors.c21333333,
                child: Column(
                  children: [
                    Padding(
                      padding: EdgeInsets.only(left: 6, top: 6, bottom: 3),
                      child: Row(
                        children: [
                          ClipRRect(
                            child: MyViews()
                                .netImg(imgURL(goods[index].shopPic), 20, 20),
                            borderRadius: BorderRadius.all(Radius.circular(10)),
                          ),
                          Expanded(
                            child: Container(
                              margin: EdgeInsets.only(right: 5, left: 5),
                              child: Text(
                                goods[index].shopName,
                                style: TextStyle(
                                  color: MyColors.c999999,
                                  fontSize: 10,
                                ),
                                maxLines: 1,
                                overflow: TextOverflow.ellipsis,
                                softWrap: true,
                              ),
                            ),
                          ),
                        ],
                      ),
                    ),
                    MyViews().netImg(imgURL(goods[index].coverPath), w, w,
                        placeholder: 'images/svg/goodsDefImg.svg'),
                    Container(
                      padding: EdgeInsets.only(right: 6, left: 6, top: 8),
                      child: Text(
                        '${goods[index].title}\n${goods[index].description}',
                        style: TextStyle(color: Colors.black, fontSize: 12),
                        maxLines: 1,
                        overflow: TextOverflow.ellipsis,
                        softWrap: true,
                      ),
                    ),
                    Container(
                      padding: EdgeInsets.only(right: 6, left: 6, top: 7),
                      child: Row(
                        children: [
                          Expanded(
                            child: Text(
                              '¥${goods[index].price}',
                              style: TextStyle(
                                  color: MyColors.cFF4233, fontSize: 15),
                            ),
                          ),
                          Container(
                            child: Text(
                              '详情',
                              style: TextStyle(
                                  color: MyColors.cFF4233, fontSize: 12),
                            ),
                            alignment: Alignment.center,
                            padding: EdgeInsets.only(bottom: 2),
                            decoration: BoxDecoration(
                                border: Border.all(
                                    color: MyColors.cFF4233, width: 1),
                                borderRadius:
                                    BorderRadius.all(Radius.circular(10))),
                            height: 20,
                            width: 50,
                          )
                        ],
                      ),
                    )
                  ],
                  crossAxisAlignment: CrossAxisAlignment.start,
                ),
              ),
            );
          });
    }
  }

  body2() {
    if (shops.length == 0) {
      return noData();
    } else {
      return ListView.builder(
        controller: _controller,
        itemBuilder: (BuildContext context, int index) {
          return GestureDetector(
            onTap: () {
              EventBus().emit('toLogin');
            },
            behavior: HitTestBehavior.translucent,
            child: Container(
              margin: EdgeInsets.only(bottom: 5),
              child: Card(
                elevation: 2,
                child: Padding(
                  padding: const EdgeInsets.all(10),
                  child: Row(
                    children: [
                      ClipRRect(
                        child: MyViews().netImg(
                            imgURL(shops[index].picture), 70, 70,
                            placeholder: 'images/svg/goodsDefImg.svg'),
                        borderRadius: BorderRadius.circular(4),
                      ),
                      Expanded(
                        child: Container(
                          height: 70,
                          margin: EdgeInsets.only(left: 10),
                          child: Column(
                            children: [
                              MyViews().myText(
                                  '${shops[index].name}(${shops[index].uid})',
                                  MyColors.c333333,
                                  14),
                              Text(
                                '店铺介绍：${shops[index].introduction}',
                                style: TextStyle(
                                    color: MyColors.c666666, fontSize: 11),
                                maxLines: 1,
                                overflow: TextOverflow.ellipsis,
                                softWrap: true,
                              ),
                              Row(
                                children: [
                                  Icon(
                                    Icons.location_on_outlined,
                                    size: 15,
                                    color: MyColors.c666666,
                                  ),
                                  Expanded(
                                    child: Text(
                                      '${shops[index].address}',
                                      style: TextStyle(
                                          color: MyColors.c666666,
                                          fontSize: 10),
                                      maxLines: 1,
                                      overflow: TextOverflow.ellipsis,
                                      softWrap: true,
                                    ),
                                  ),
                                ],
                              ),
                            ],
                            mainAxisAlignment: MainAxisAlignment.spaceBetween,
                            crossAxisAlignment: CrossAxisAlignment.start,
                          ),
                        ),
                      )
                    ],
                  ),
                ),
              ),
            ),
          );
        },
        itemCount: shops.length,
        padding: EdgeInsets.all(16),
      );
    }
  }

  void touristQueryData() {
    MyDio().post('/model/visitHome', {'type': pageIndex, 'page': page},
        (response, hasError) {
      if (!hasError) {
        if (pageIndex == 0) {
          TouristPublicShopBeanEntity entity = TouristPublicShopBeanEntity()
              .fromJson(json.decode(response.data.toString()));
          if (page == 1) {
            shops.clear();
          }
          shops.addAll(entity.data);
        } else {
          TouristGoodsBeanEntity entity = TouristGoodsBeanEntity()
              .fromJson(json.decode(response.data.toString()));
          if (page == 1) {
            goods.clear();
          }
          goods.addAll(entity.data);
        }
        setState(() {});
      }
      endRe(_reController);
    }, (error) {});
  }
}