Flutter实战视频-移动电商-33.列表页_子类和商品列表交互效果
33.列表页_子类和商品列表交互效果
主要实现点击小类下面的列表跟着切换
获取右侧下面的列表信息，即要传递大类的id也要传递小类的，所以需要把左侧的大类的id也要Provide化
可以看下网站上的接口说明：
大类id Provide化
当我们点击左侧的大类的时候，要把当前的大类id存起来。
category_page.dart
我们修改了上面的多传递了参数以后，那么category_page.dart页面地方就会报错了。
分别传入我们的大类id
这我们去掉async和await修饰符
我们把这个_getGoodsList方法复制一个 到下面
复制到 _rightInkWell方法下面
已经有这个访问数据的方法，下一步就是调用我们的方法
数据展示：
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 String categoryId='4';//大类ID 白酒的id 默认为4 //大类切换逻辑 getChildCategory(List<BxMallSubDto> list,String id){ childIndex=0;//每次点击大类，小类的索引都要清空掉 categoryId=id; 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 } }
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,categoryId); _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,list[0].mallCategoryId); }); } void _getGoodsList({String categoryId}) { var data={ 'categoryId':categoryId==null?'4':categoryId,//白酒的默认类别 'categorySubId':"", 'page':1 }; 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); _getGoodsList(item.mallSubId); },//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 ), ), ), ); } void _getGoodsList(String categorySubId) { var data={ 'categoryId':Provide.value<ChildCategory>(context).categoryId,//大类ID 'categorySubId':categorySubId, 'page':1 }; 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 Provide.value<CategoryGoodsListProvide>(context).getGoodsList(goodsList.data); }); } } //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) ], ) ], ), ), ); } }
