Flutter移动电商实战 --（32）列表页_小类高亮交互效果制作

小鱼儿 2023-06-01 06:04 3阅读 0赞

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

![1090399-20190901192536093-992489271.png][]

Expaned是有伸缩能力的小部件，继承于Flexible

![1090399-20190901192604912-704978677.png][]

外层套一个Expanded，内部的Contaienr的高度不再设置

![1090399-20190901192627493-1935816953.png][]

右侧列表没有设置高度一样显示出来了。

![1090399-20190901192739622-836586540.png][]

# 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

![1090399-20190901192812686-645461434.png][]

# category\_page.dart #

![1090399-20190901192842733-588564429.png][]

![1090399-20190901192904706-555760145.png][]

![1090399-20190901192922680-1713021169.png][]

默认的索引已经标红了。

![1090399-20190901192948099-382119164.png][]

# 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

![1090399-20190901193018542-675178270.png][]

这是我们之前定义好的方法：

![1090399-20190901193048049-554246074.png][]

# 效果展示 #

点击子类，对应的子类颜色发生了变化。

![1090399-20190901193118814-1492156203.png][]

# 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)
                  ],
                )
              ],
            ),
          ),
        );
      }
    }

转载于:https://www.cnblogs.com/crazycode2/p/11440545.html

[1090399-20190901192536093-992489271.png]: /images/20230601/5d104151ce904bf3a5f45b5d559dc7d8.png
[1090399-20190901192604912-704978677.png]: /images/20230601/5e65aac63a774e8b9107545d76a3e83c.png
[1090399-20190901192627493-1935816953.png]: /images/20230601/aa9cb68509314bcfa9d9cd08d82bd6ed.png
[1090399-20190901192739622-836586540.png]: /images/20230601/8e2dcadcbc3748e38e3293cc1f38e22b.png
[1090399-20190901192812686-645461434.png]: /images/20230601/45c290e375c04f27b57fe5aa15be39bc.png
[1090399-20190901192842733-588564429.png]: /images/20230601/154aeda3db8f4187bfb756b00e6855ad.png
[1090399-20190901192904706-555760145.png]: /images/20230601/4d71718dde0a48ca83ce4fee587c6284.png
[1090399-20190901192922680-1713021169.png]: /images/20230601/62cf4d4465b64076857a59d211248d52.png
[1090399-20190901192948099-382119164.png]: /images/20230601/0ea91132e13c406dbab0c4d496a3b45e.png
[1090399-20190901193018542-675178270.png]: /images/20230601/599a091589b7495984d7afa8b75a17c5.png
[1090399-20190901193048049-554246074.png]: /images/20230601/795172a719324f58a591b27c3499dbac.png
[1090399-20190901193118814-1492156203.png]: /images/20230601/ac9c12b067154625b4f87d0f209a0419.png