点击大类右侧的横向的小类红色显示当前的小类别
解决之前溢出的问题：
先解决一个bug，之前右侧的这里设置的高度是1000，但是有不同的虚拟机和手机设别的问题造成了溢出的问题
Expaned是有伸缩能力的小部件，继承于Flexible
外层套一个Expanded，内部的Contaienr的高度不再设置
右侧列表没有设置高度一样显示出来了。
provide的修改
使用provide来交互，左侧大类是一个，右侧上面横向的小类是一个，两个类之间交互使用provide来交互
category_page.dart
默认的索引已经标红了。
点击小类改变状态
我们之前之类的点击事件留空了，所以我们在点击事件里面更改我们的provide里面的索引值就可以了。
调用的是我们的provide里面定义好的方法：changeChildIndex
这是我们之前定义好的方法：
效果展示
点击子类，对应的子类颜色发生了变化。
最终代码：
provide/child_category.dart
import 'package:flutter/material.dart';
import '../model/category.dart'; class ChildCategory with ChangeNotifier{
List<BxMallSubDto> childCategoryList=[];
int childIndex=0;//子类高亮索引
//大类切换逻辑
getChildCategory(List<BxMallSubDto> list){
childIndex=0;//每次点击大类，小类的索引都要清空掉
BxMallSubDto all=BxMallSubDto();
all.mallCategoryId="00";
all.mallCategoryId="00";
all.comments="null";
all.mallSubName='全部';
childCategoryList=[all];
//childCategoryList=list;
childCategoryList.addAll(list);
notifyListeners();//监听
}
//改变子类索引,indexs是从哪里来的呢？从我们具体的类中进行传递
changeChildIndex(index){
childIndex=index;//把传递过来的index赋值给我们的childIndex
notifyListeners();//通知
}
}
category_page.dart
import 'package:flutter/material.dart';
import '../service/service_method.dart';
import 'dart:convert';
import '../model/category.dart';
import '../model/categoryGoodsList.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:provide/provide.dart';
import '../provide/child_category.dart';
import '../provide/category_goods_list.dart'; class CategoryPage extends StatefulWidget {
@override
_CategoryPageState createState() => _CategoryPageState();
} class _CategoryPageState extends State<CategoryPage> {
@override
Widget build(BuildContext context) {
//_getCategory();
return Scaffold(
appBar: AppBar(title: Text('商品分类'),),
body: Container(
child: Row(
children: <Widget>[
LeftCategoryNav(),
Column(
children: <Widget>[
RightCategoryNav(),
CategoryGoodsList()
],
)
],
),
),
);
} } //左侧大类导航
class LeftCategoryNav extends StatefulWidget {
@override
_LeftCategoryNavState createState() => _LeftCategoryNavState();
} class _LeftCategoryNavState extends State<LeftCategoryNav> {
List list=[];
var listIndex=0;
@override
void initState() {
super.initState();
_getCategory();//请求接口的数据
_getGoodsList();//参数是可选的默认是4 所以这里可以不用传值
}
@override
Widget build(BuildContext context) {
return Container(
width: ScreenUtil().setWidth(180),
decoration: BoxDecoration(
border: Border(
right: BorderSide(width:1.0,color: Colors.black12),//有边框
)
),
child: ListView.builder(
itemCount: list.length,
itemBuilder: (contex,index){
return _leftInkWell(index);
},
),
);
} Widget _leftInkWell(int index){
bool isClick=false;
isClick=(index==listIndex)?true:false;
return InkWell(
onTap: (){
setState(() {
listIndex=index;
});
var childList=list[index].bxMallSubDto;//当前大类的子类的列表
var categoryId=list[index].mallCategoryId;//大类的id
Provide.value<ChildCategory>(context).getChildCategory(childList);
_getGoodsList(categoryId:categoryId);
},
child: Container(
height: ScreenUtil().setHeight(100),
padding: EdgeInsets.only(left:10.0,top:10.0),
decoration: BoxDecoration(
color: isClick?Color.fromRGBO(236, 236, 236, 1.0): Colors.white,
border: Border(
bottom: BorderSide(width: 1.0,color: Colors.black12)
)
),
child: Text(
list[index].mallCategoryName,
style: TextStyle(fontSize: ScreenUtil().setSp(28)),//设置字体大小，为了兼容使用setSp
),
),
);
}
void _getCategory() async{
await request('getCategory').then((val){
var data=json.decode(val.toString());
//print(data);
CategoryModel category= CategoryModel.fromJson(data);
setState(() {
list=category.data;
});
Provide.value<ChildCategory>(context).getChildCategory(list[0].bxMallSubDto);
});
} void _getGoodsList({String categoryId}) async {
var data={
'categoryId':categoryId==null?'4':categoryId,//白酒的默认类别
'CategorySubId':"",
'page':1
};
await request('getMallGoods',formData: data).then((val){
var data=json.decode(val.toString());
CategoryGoodsListModel goodsList=CategoryGoodsListModel.fromJson(data);//这样就从json'转换成了model类
//print('>>>>>>>>>>>>>>>>>>>>>>>>>>>>>:${goodsList.data[0].goodsName}');
// setState(() {
// list=goodsList.data;
// });
Provide.value<CategoryGoodsListProvide>(context).getGoodsList(goodsList.data);
});
}
} class RightCategoryNav extends StatefulWidget {
@override
_RightCategoryNavState createState() => _RightCategoryNavState();
} class _RightCategoryNavState extends State<RightCategoryNav> {
//List list = ['名酒','宝丰','北京二锅头','舍得','五粮液','茅台','散白'];
@override
Widget build(BuildContext context) {
return Provide<ChildCategory>(
builder: (context,child,childCategory){
return Container(
height: ScreenUtil().setHeight(80),
width: ScreenUtil().setWidth(570),//总的宽度是750 -180
decoration: BoxDecoration(
color: Colors.white,//白色背景
border: Border(
bottom: BorderSide(width: 1.0,color: Colors.black12)//边界线
)
),
child: ListView.builder(
scrollDirection: Axis.horizontal,
itemCount: childCategory.childCategoryList.length,
itemBuilder: (context,index){
return _rightInkWell(index,childCategory.childCategoryList[index]);
},
),
);
}
);
} Widget _rightInkWell(int index,BxMallSubDto item){
bool isClick=false;
isClick=(index==Provide.value<ChildCategory>(context).childIndex)?true:false; return InkWell(
onTap: (){
Provide.value<ChildCategory>(context).changeChildIndex(index);
},//事件留空
child: Container(//什么都加一个container，这样好布局
padding: EdgeInsets.fromLTRB(5.0, 10.0, 5.0, 10.0),//上下是10 左右是5.0
child: Text(
item.mallSubName,
style:TextStyle(
fontSize: ScreenUtil().setSp(28),
color: isClick?Colors.pink:Colors.black
),
),
),
);
}
} //商品列表 ，可以上拉加载
class CategoryGoodsList extends StatefulWidget {
@override
_CategoryGoodsListState createState() => _CategoryGoodsListState();
} class _CategoryGoodsListState extends State<CategoryGoodsList> { @override
void initState() {
//_getGoodsList();
super.initState();
}
@override
Widget build(BuildContext context) {
return Provide<CategoryGoodsListProvide>(
builder: (context,child,data){
return Expanded(
child: Container(
width: ScreenUtil().setWidth(570),
//height: ScreenUtil().setHeight(974),
child: ListView.builder(
itemCount: data.goodsList.length,
itemBuilder: (contex,index){
return _listWidget(data.goodsList,index);
},
),
),
);
},
); } Widget _goodsImage(List newList,index){
return Container(
width: ScreenUtil().setWidth(200),//设置200的宽度 限制
child: Image.network(newList[index].image),
);
}
Widget _goodsName(List newList,index){
return Container(
padding: EdgeInsets.all(5.0),//上下左右都是5.0的内边距
width: ScreenUtil().setWidth(370),//370是一个大约的值
child: Text(
newList[index].goodsName,
maxLines: 2,//最多显示2行内容
overflow: TextOverflow.ellipsis,
style: TextStyle(fontSize: ScreenUtil().setSp(28)),//字体大小
),
);
} Widget _goodsPrice(List newList,index){
return Container(
margin: EdgeInsets.only(top:20.0),//和上面的外间距
width: ScreenUtil().setWidth(370),//370是一个大约的值
child: Row(
children: <Widget>[
Text(
'价格￥${newList[index].presentPrice}',
style: TextStyle(color: Colors.pink,fontSize: ScreenUtil().setSp(30)),
),
Text(
'价格￥${newList[index].oriPrice}',
style: TextStyle(
color: Colors.black26,
decoration: TextDecoration.lineThrough
),//删除线的样式
)
],
),
);
} Widget _listWidget(List newList,int index){
return InkWell(
onTap: (){},
child: Container(
padding: EdgeInsets.only(top:5.0,bottom:5.0),
decoration: BoxDecoration(
color: Colors.white,
border: Border(
bottom: BorderSide(width: 1.0,color: Colors.black12)
)
),
child: Row(
children: <Widget>[
_goodsImage(newList,index),
Column(
children: <Widget>[
_goodsName(newList,index),
_goodsPrice(newList,index)
],
)
],
),
),
);
}
}
.