17.首页_楼层组件的编写技巧
博客地址：
https://jspang.com/post/FlutterShop.html#toc-b50
楼层的效果：
标题
stlessW快速生成：
接收一个String类型的参数
标题的各个边上有内边距我们先设置一下
这样我们的标题组件就写完了
楼层商品内容
然后再学些每个楼层的商品。接收一个List数组
里面的每个子项拆分成item，这里我们先写个内部方法，接收一个Map类型的goods的商品子项
这样我们的子组件就写完了
商品我们分成两行，我们先写第一行的商品。
第一行：有两列，第一个列是一个大图，第二列是又分为两列，我们用column就可以了。
第二行：一行两列，每一列是一个商品元素
这样我们就把 上下两快，当做一个column。
准备数据
标题效果展示
纠正一个错误的代码：这里我之前写的是时候没有调用goodItem方法
第二行的内容
最终展示效果
点击图片会有点击事件
其他两层楼的商品信息
一共分为三个列表。都是一个标题一个列表。
最终效果图
最终代码
import 'package:flutter/material.dart';
import '../service/service_method.dart';
import 'package:flutter_swiper/flutter_swiper.dart';
import 'dart:convert';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:url_launcher/url_launcher.dart'; class HomePage extends StatefulWidget {
@override
_HomePageState createState() => _HomePageState();
} class _HomePageState extends State<HomePage> with AutomaticKeepAliveClientMixin{ @override
bool get wantKeepAlive => true; @override
void initState() {
super.initState();
print('');
} String homePageContent='正在获取数据';
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text('百姓生活+')),
body: FutureBuilder(
future: getHomePageContent(),
builder: (context, snapshot) {
if(snapshot.hasData){
var data=json.decode(snapshot.data.toString());
List<Map> swiper=(data['data']['slides'] as List).cast();
List<Map> navigatorList=(data['data']['category'] as List).cast();
String adPicture=data['data']['advertesPicture']['PICTURE_ADDRESS'];
String leaderImage=data['data']['shopInfo']['leaderImage'];
String leaderPhone=data['data']['shopInfo']['leaderPhone'];
List<Map> recommendList=(data['data']['recommend'] as List).cast();
String floor1Title=data['data']['floor1Pic']['PICTURE_ADDRESS'];
String floor2Title=data['data']['floor2Pic']['PICTURE_ADDRESS'];
String floor3Title=data['data']['floor3Pic']['PICTURE_ADDRESS'];
List<Map> floor1=(data['data']['floor1'] as List).cast();
List<Map> floor2=(data['data']['floor2'] as List).cast();
List<Map> floor3=(data['data']['floor3'] as List).cast(); return SingleChildScrollView(
child: Column(
children: <Widget>[
SwiperDiy(swiperDateList: swiper),
TopNavigator(navigatorList:navigatorList ,),
AdBanner(adPicture:adPicture),
LeaderPhone(leaderImage: leaderImage,leaderPhone: leaderPhone,),
Recommend(recommendList:recommendList),
FloorTitle(picture_address: floor1Title,),//楼层1的标题图片
FloorContent(floorGoodsList: floor1),
FloorTitle(picture_address: floor2Title,),//楼层1的标题图片
FloorContent(floorGoodsList: floor2),
FloorTitle(picture_address: floor3Title,),//楼层1的标题图片
FloorContent(floorGoodsList: floor3)
],
),
);
}else{
return Center(child: Text('加载中....'));
}
},
),
);
}
}
//首页轮播插件
class SwiperDiy extends StatelessWidget {
final List swiperDateList;
//构造函数
SwiperDiy({this.swiperDateList}); @override
Widget build(BuildContext context) { // print('设备的像素密度：${ScreenUtil.pixelRatio}');
// print('设备的高：${ScreenUtil.screenWidth}');
// print('设备的宽：${ScreenUtil.screenHeight}'); return Container(
height: ScreenUtil().setHeight(),//
width:ScreenUtil().setWidth(),
child: Swiper(
itemBuilder: (BuildContext context,int index){
return Image.network("${swiperDateList[index]['image']}",fit: BoxFit.fill,);
},
itemCount: swiperDateList.length,
pagination: SwiperPagination(),
autoplay: true,
),
);
}
} class TopNavigator extends StatelessWidget {
final List navigatorList; TopNavigator({Key key, this.navigatorList}) : super(key: key); Widget _gridViewItemUI(BuildContext context,item){
return InkWell(
onTap: (){print('点击了导航');},
child: Column(
children: <Widget>[
Image.network(item['image'],width: ScreenUtil().setWidth()),
Text(item['mallCategoryName'])
],
),
);
}
@override
Widget build(BuildContext context) {
if(this.navigatorList.length>){
this.navigatorList.removeRange(,this.navigatorList.length);//从第十个截取，后面都截取掉
}
return Container(
height: ScreenUtil().setHeight(),//只是自己大概预估的一个高度，后续可以再调整
padding: EdgeInsets.all(3.0),//为了不让它切着屏幕的边缘，我们给它一个padding
child: GridView.count(
crossAxisCount: ,//每行显示5个元素
padding: EdgeInsets.all(5.0),//每一项都设置一个padding，这样他就不挨着了。
children: navigatorList.map((item){
return _gridViewItemUI(context,item);
}).toList(),
),
);
}
} class AdBanner extends StatelessWidget {
final String adPicture; AdBanner({Key key, this.adPicture}) : super(key: key); @override
Widget build(BuildContext context) {
return Container(
child: Image.network(adPicture),
);
}
} //店长电话模块
class LeaderPhone extends StatelessWidget {
final String leaderImage;//店长图片
final String leaderPhone;//店长电话 LeaderPhone({Key key, this.leaderImage,this.leaderPhone}) : super(key: key); @override
Widget build(BuildContext context) {
return Container(
child: InkWell(
onTap: _launchURL,
child: Image.network(leaderImage),
),
);
} void _launchURL() async {
String url = 'tel:'+leaderPhone;
//String url = 'http://jspang.com';
if(await canLaunch(url)){
await launch(url);
}else{
throw 'url不能进行访问，异常';
}
}
} //商品推荐
class Recommend extends StatelessWidget {
final List recommendList; Recommend({Key key, this.recommendList}) : super(key: key); //商品标题
Widget _titleWidget(){
return Container(
alignment: Alignment.centerLeft,//局长靠左对齐
padding: EdgeInsets.fromLTRB(10.0, 2.0, , 5.0),//左上右下
decoration: BoxDecoration(
color: Colors.white,
border: Border(
bottom: BorderSide(width: 0.5,color: Colors.black12) //设置底部的bottom的边框，Black12是浅灰色
),
),
child: Text(
'商品推荐',
style:TextStyle(color: Colors.pink)
),
);
}
//商品单独项方法
Widget _item(index){
return InkWell(
onTap: (){},//点击事件先留空
child: Container(
height: ScreenUtil().setHeight(),//兼容性的高度 用了ScreenUtil
width: ScreenUtil().setWidth(),//750除以3所以是250
padding: EdgeInsets.all(8.0),
decoration: BoxDecoration(
color: Colors.white,
border: Border(
left: BorderSide(width: ,color: Colors.black12)//右侧的 边线的样式 宽度和 颜色
)
),
child: Column(
children: <Widget>[
Image.network(recommendList[index]['image']),
Text('￥${recommendList[index]['mallPrice']}'),
Text(
'￥${recommendList[index]['price']}',
style: TextStyle(
decoration: TextDecoration.lineThrough,//删除线的样式
color: Colors.grey//浅灰色
),
),
],
),
),
);
}
//横向列表方法
Widget _recommendList(){
return Container(
height: ScreenUtil().setHeight(),
child: ListView.builder(
scrollDirection: Axis.horizontal,//横向的
itemCount: recommendList.length,
itemBuilder: (context,index){
return _item(index);
},
),
);
} @override
Widget build(BuildContext context) {
return Container(
height: ScreenUtil().setHeight(),//列表已经设置为330了因为还有上面标题，所以要比330高，这里先设置为380
margin: EdgeInsets.only(top: 10.0),
child: Column(
children: <Widget>[
_titleWidget(),
_recommendList()
],
),
);
}
} //楼层标题
class FloorTitle extends StatelessWidget {
final String picture_address; FloorTitle({Key key, this.picture_address}) : super(key: key); @override
Widget build(BuildContext context) {
return Container(
padding: EdgeInsets.all(8.0),
child: Image.network(picture_address),
);
}
} //楼层商品列表
class FloorContent extends StatelessWidget {
final List floorGoodsList; FloorContent({Key key, this.floorGoodsList}) : super(key: key); @override
Widget build(BuildContext context) {
return Container(
child: Column(
children: <Widget>[
_firstRow(),
_otherGoods()
],
),
);
} Widget _firstRow(){
return Row(
children: <Widget>[
_goodsItem(floorGoodsList[]),
Column(
children: <Widget>[
_goodsItem(floorGoodsList[]),
_goodsItem(floorGoodsList[])
],
)
],
);
}
Widget _otherGoods(){
return Row(
children: <Widget>[
_goodsItem(floorGoodsList[]),
_goodsItem(floorGoodsList[])
],
);
}
Widget _goodsItem(Map goods){
return Container(
width: ScreenUtil().setWidth(),
child: InkWell(
onTap: (){print('点击了楼层商品');},
child: Image.network(goods['image']),
),
);
}
}
home_page.dart