04Flutter仿京东商城项目 首页商品列表布局

Home.dart

import 'package:flutter/material.dart';
import 'package:flutter_swiper/flutter_swiper.dart';
import '../../services/ScreenAdaper.dart';

class HomePage extends StatefulWidget {
  HomePage({Key key}) : super(key: key);

  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  //轮播图：
  //flutter run -d all 链接多个设备的命令：
  Widget _swiperWidget() {
    List<Map> imgList = [
      {"url": "https://www.itying.com/images/flutter/slide01.jpg"},
      {"url": "https://www.itying.com/images/flutter/slide02.jpg"},
      {"url": "https://www.itying.com/images/flutter/slide03.jpg"}
    ];

    return Container(
      child: AspectRatio(
        aspectRatio: 2 / 1,
        child: Swiper(
          itemBuilder: (BuildContext context, int index) {
            return new Image.network(
              imgList[index]['url'],
              fit: BoxFit.fill,
            );
          },
          itemCount: imgList.length,
          pagination: new SwiperPagination(),
          control: new SwiperControl(),
          autoplay: true,
        ),
      ),
    );
  }

  //标题：
  Widget _titleWidget(value) {
    return Container(
      height: ScreenAdaper.height(46),
      margin: EdgeInsets.only(left: ScreenAdaper.width(20)),
      padding: EdgeInsets.only(left: ScreenAdaper.width(20)),
      decoration: BoxDecoration(
          border: Border(
              left: BorderSide(
                  color: Colors.red,  ScreenAdaper.width(10)))),
      child: Text(value, style: TextStyle(color: Colors.black54)),
    );
  }

  //热门商品：
  Widget _hotProductListWidget() {
    return Container(
      height: ScreenAdaper.height(240),
      padding: EdgeInsets.all(ScreenAdaper.width(20)),
      //  double.infinity, //寬度自適應
      child: ListView.builder(
        scrollDirection: Axis.horizontal,
        itemBuilder: (contxt, index) {
          return Column(
            children: <Widget>[
              Container(
                height: ScreenAdaper.height(140),
                 ScreenAdaper.width(140),
                margin: EdgeInsets.only(right: ScreenAdaper.width(21)),
                child: Image.network(
                    'https://www.itying.com/images/flutter/hot${index + 1}.jpg',
                    fit: BoxFit.cover),
              ),
              Container(
                padding: EdgeInsets.only(top: ScreenAdaper.height(10)),
                height: ScreenAdaper.height(44),
                child: Text('第${index}条'),
              )
            ],
          );
        },
        itemCount: 9,
      ),
    );
  }

  Widget _recProductItemListWidget() {
    var itemWidth = (ScreenAdaper.getScreenWidth() - 30) / 2;
    return Container(
      padding: EdgeInsets.all(ScreenAdaper.width(20)),
       itemWidth,
      decoration:
          BoxDecoration(border: Border.all(color: Colors.black12,  1)),
      child: Column(
        children: <Widget>[
          Container(
             double.infinity,
            child: AspectRatio(
              aspectRatio: 1 / 1,
              child: Image.network(
                  "https://www.itying.com/images/flutter/list1.jpg",
                  fit: BoxFit.cover),
            ),
          ),
          Padding(
            padding: EdgeInsets.only(top: ScreenAdaper.height(10)),
            child: Text(
              '2019秋季大促2019秋季大促2019秋季大促2019秋季大促2019秋季大促2019秋季大促',
              maxLines: 2,
              overflow: TextOverflow.ellipsis,
              style: TextStyle(color: Colors.black54),
            ),
          ),
          Padding(
            padding: EdgeInsets.only(top: ScreenAdaper.height(20)),
            child: Stack(
              children: <Widget>[
                Align(
                  alignment: Alignment.centerLeft,
                  child: Text(
                    '123',
                    style: TextStyle(color: Colors.red, fontSize: 16),
                  ),
                ),
                Align(
                  alignment: Alignment.centerRight,
                  child: Text(
                    '123',
                    style: TextStyle(
                        color: Colors.black54,
                        fontSize: 16,
                        decoration: TextDecoration.lineThrough),
                  ),
                )
              ],
            ),
          )
        ],
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    ScreenAdaper.init(context);
    return ListView(
      children: <Widget>[
        _swiperWidget(),
        SizedBox(height: ScreenAdaper.height(20)),
        _titleWidget("猜你喜欢"),
        _hotProductListWidget(),
        SizedBox(height: ScreenAdaper.height(20)),
        _titleWidget("热门推荐"),
        Container(
          padding: EdgeInsets.all(10),
          child: Wrap(
            runSpacing: 10,
            spacing: 10,
            children: <Widget>[
              _recProductItemListWidget(),
              _recProductItemListWidget(),
              _recProductItemListWidget(),
              _recProductItemListWidget(),
              _recProductItemListWidget(),
              _recProductItemListWidget()
            ],
          ),
        )
      ],
    );
  }
}