32.列表页_小类高亮交互效果制作
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{ ListchildCategoryList=[]; int childIndex=0;//子类高亮索引 //大类切换逻辑 getChildCategory(List 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 }}
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{ @override Widget build(BuildContext context) { //_getCategory(); return Scaffold( appBar: AppBar(title: Text('商品分类'),), body: Container( child: Row( children: [ LeftCategoryNav(), Column( children: [ RightCategoryNav(), CategoryGoodsList() ], ) ], ), ), ); } }//左侧大类导航class LeftCategoryNav extends StatefulWidget { @override _LeftCategoryNavState createState() => _LeftCategoryNavState();}class _LeftCategoryNavState extends State { 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 (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 (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 (context).getGoodsList(goodsList.data); }); }}class RightCategoryNav extends StatefulWidget { @override _RightCategoryNavState createState() => _RightCategoryNavState();}class _RightCategoryNavState extends State { //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 ( 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 (context).childIndex)?true:false; return InkWell( onTap: (){ Provide.value (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 { @override void initState() { //_getGoodsList(); super.initState(); } @override Widget build(BuildContext context) { return Provide ( 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: [ 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: [ _goodsImage(newList,index), Column( children: [ _goodsName(newList,index), _goodsPrice(newList,index) ], ) ], ), ), ); }}