博客地址:https://jspang.com/post/FlutterShop.html#toc-c42html
點擊左側的大類右邊的小類也跟着變化json
要改變哪裏就建哪裏的provide,咱們如今要改變的是右邊的商品列表的數組。數組
category_goods_list.dartapp
這樣咱們的provide類就作好了less
這一步叫作 把狀態放入頂層jsp
_getGoodsList方法總體移動到左側的大類async
咱們把他移動到了這裏ide
方法移動過來之後,咱們要接受一個參數類別id,這個類別是可選的,可選的參數用{}括起來佈局
再判斷傳入的參數是否有值,若是有值就用這個值,若是沒有值就用默認的白酒的分類是4post
import '../provide/category_goods_list.dart';
這個時候咱們會發現咱們傳入list的值有錯。
實際上咱們的CategoryGoodsListModel類裏面的data纔是咱們要傳入的列表值 List<CategoryListData>
因此這裏咱們要用.data的形式
list沒有用,已經換成了provide的狀態管理。這裏刪除掉就能夠了。
咱們要在container的外層包括一層provide才能夠去使用狀態管理。
外層包括Provide,builder裏面三個參數,1:上下文對象 2:child 3:就是咱們的數據了
全部list的地方都要換成newList
在咱們左側大類的onTap事件裏面去調用這個小類數據的方法
點擊後右側出現了數據
默認記載白酒的子類數據
lib/provide/category_goods_list.dart
import 'package:flutter/material.dart'; import '../model/categoryGoodsList.dart'; class CategoryGoodsListProvide with ChangeNotifier{ List<CategoryListData> goodsList=[]; //點擊大類時候更換商品列表 getGoodsList(List<CategoryListData> list){ goodsList=list; notifyListeners(); } }
main.dart
import 'package:flutter/material.dart'; import './pages/index_page.dart'; import 'package:provide/provide.dart'; import './provide/counter.dart'; import './provide/child_category.dart'; import './provide/category_goods_list.dart'; void main(){ var counter=Counter(); var childCategory=ChildCategory(); var categoryGoodsListProvide=CategoryGoodsListProvide(); var providers=Providers(); //註冊 依賴 providers ..provide(Provider<Counter>.value(counter)) ..provide(Provider<CategoryGoodsListProvide>.value(categoryGoodsListProvide)) ..provide(Provider<ChildCategory>.value(childCategory)); runApp(ProviderNode(child: MyApp(),providers: providers,)); } class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return Container( child:MaterialApp( title:'百姓生活+', debugShowCheckedModeBanner: false, theme: ThemeData( primaryColor: Colors.pink ), home: IndexPage(), ) ); } }
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('商品分類'),), body: Container( child: Row( children: <Widget>[ LeftCategoryNav(), Column( children: <Widget>[ RightCategoryNav(), CategoryGoodsList() ], ) ], ), ), ); } } //左側大類導航 class LeftCategoryNav extends StatefulWidget { @override _LeftCategoryNavState createState() => _LeftCategoryNavState(); } class _LeftCategoryNavState extends State<LeftCategoryNav> { List list=[]; var listIndex=0; @override void initState() { super.initState(); _getCategory();//請求接口的數據 _getGoodsList();//參數是可選的默認是4 因此這裏能夠不用傳值 } @override Widget build(BuildContext context) { return Container( width: ScreenUtil().setWidth(180), decoration: BoxDecoration( border: Border( right: BorderSide(width:1.0,color: Colors.black12),//有邊框 ) ), 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;//當前大類的子類的列表 var categoryId=list[index].mallCategoryId;//大類的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)),//設置字體大小,爲了兼容使用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,//白酒的默認類別 'CategorySubId':"", 'page':1 }; await request('getMallGoods',formData: data).then((val){ var data=json.decode(val.toString()); CategoryGoodsListModel goodsList=CategoryGoodsListModel.fromJson(data);//這樣就從json'轉換成了model類 //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','寶丰','北京二鍋頭','捨得','五糧液','茅臺','散白']; @override Widget build(BuildContext context) { return Provide<ChildCategory>( builder: (context,child,childCategory){ return Container( height: ScreenUtil().setHeight(80), width: ScreenUtil().setWidth(570),//總的寬度是750 -180 decoration: BoxDecoration( color: Colors.white,//白色背景 border: Border( bottom: BorderSide(width: 1.0,color: Colors.black12)//邊界線 ) ), child: ListView.builder( scrollDirection: Axis.horizontal, itemCount: childCategory.childCategoryList.length, itemBuilder: (context,index){ return _rightInkWell(childCategory.childCategoryList[index]); }, ), ); } ); } Widget _rightInkWell(BxMallSubDto item){ return InkWell( onTap: (){},//事件留空 child: Container(//什麼都加一個container,這樣好佈局 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)), ), ), ); } } //商品列表 ,能夠上拉加載 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 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),//設置200的寬度 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的內邊距 width: ScreenUtil().setWidth(370),//370是一個大約的值 child: Text( newList[index].goodsName, maxLines: 2,//最多顯示2行內容 overflow: TextOverflow.ellipsis, style: TextStyle(fontSize: ScreenUtil().setSp(28)),//字體大小 ), ); } Widget _goodsPrice(List newList,index){ return Container( margin: EdgeInsets.only(top:20.0),//和上面的外間距 width: ScreenUtil().setWidth(370),//370是一個大約的值 child: Row( children: <Widget>[ Text( '價格¥${newList[index].presentPrice}', style: TextStyle(color: Colors.pink,fontSize: ScreenUtil().setSp(30)), ), Text( '價格¥${newList[index].oriPrice}', style: TextStyle( color: Colors.black26, decoration: TextDecoration.lineThrough ),//刪除線的樣式 ) ], ), ); } 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) ], ) ], ), ), ); } }