今天,我将提供一个实际的示例,演示如何在单个页面上实现多个列表,这些列表可以水平排列、网格格式、垂直排列,甚至是这些常用布局的组合。
下面是要做的:
实现
让我们从创建一个包含产品所有属性的产品模型开始。
class Product {final String id;final String name;final double price;final String image;const Product({required this.id,required this.name,required this.price,required this.image,});factory Product.fromJson(Map json) {return Product(id: json['id'],name: json['name'],price: json['price'],image: json['image'],);}
}
现在,我们将设计我们的小部件以支持水平、垂直和网格视图。
创建一个名为 HorizontalRawWidget 的新窗口小部件类,定义水平列表的用户界面。
import 'package:flutter/material.dart';
import 'package:multiple_listview_example/models/product.dart';class HorizontalRawWidget extends StatelessWidget {final Product product;const HorizontalRawWidget({Key? key, required this.product}): super(key: key);Widget build(BuildContext context) {return Padding(padding: const EdgeInsets.only(left: 15,),child: Container(width: 125,decoration: BoxDecoration(color: Colors.white, borderRadius: BorderRadius.circular(12)),child: Column(crossAxisAlignment: CrossAxisAlignment.start,children: [Padding(padding: const EdgeInsets.fromLTRB(5, 5, 5, 0),child: ClipRRect(borderRadius: BorderRadius.circular(12),child: Image.network(product.image,height: 130,fit: BoxFit.contain,),),),Expanded(child: Padding(padding: const EdgeInsets.all(8.0),child: Column(crossAxisAlignment: CrossAxisAlignment.start,children: [Expanded(child: Text(product.name,maxLines: 2,overflow: TextOverflow.ellipsis,style: const TextStyle(color: Colors.black,fontSize: 12,fontWeight: FontWeight.bold)),),Row(crossAxisAlignment: CrossAxisAlignment.end,children: [Text("\$${product.price}",style: const TextStyle(color: Colors.black, fontSize: 12)),],),],),),)],),),);}
}
设计一个名为 GridViewRawWidget 的小部件类,定义单个网格视图的用户界面。
import 'package:flutter/material.dart';
import 'package:multiple_listview_example/models/product.dart';class GridViewRawWidget extends StatelessWidget {final Product product;const GridViewRawWidget({Key? key, required this.product}) : super(key: key);Widget build(BuildContext context) {return Container(padding: const EdgeInsets.all(5),decoration: BoxDecoration(color: Colors.white, borderRadius: BorderRadius.circular(10)),child: Column(children: [AspectRatio(aspectRatio: 1,child: ClipRRect(borderRadius: BorderRadius.circular(10),child: Image.network(product.image,fit: BoxFit.fill,),),)],),);}
}
最后,让我们为垂直视图创建一个小部件类。
import 'package:flutter/material.dart';
import 'package:multiple_listview_example/models/product.dart';class VerticalRawWidget extends StatelessWidget {final Product product;const VerticalRawWidget({Key? key, required this.product}) : super(key: key);Widget build(BuildContext context) {return Container(margin: const EdgeInsets.symmetric(horizontal: 15, vertical: 5),padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 10),color: Colors.white,child: Row(children: [Image.network(product.image,width: 78,height: 88,),const SizedBox(width: 15,),Expanded(child: Column(crossAxisAlignment: CrossAxisAlignment.start,children: [Text(product.name,style: const TextStyle(fontSize: 12, color: Colors.black, fontWeight: FontWeight.bold),),SizedBox(height: 5,),Text("\$${product.price}",style: const TextStyle(color: Colors.black, fontSize: 12)),],),)],),);}
}
现在是时候把所有的小部件合并到一个屏幕中了,我们先创建一个名为“home_page.dart”的页面,在这个页面中,我们将使用一个横向的 ListView、纵向的 ListView 和 GridView。
import 'package:flutter/material.dart';
import 'package:multiple_listview_example/models/product.dart';
import 'package:multiple_listview_example/utils/product_helper.dart';
import 'package:multiple_listview_example/views/widgets/gridview_raw_widget.dart';
import 'package:multiple_listview_example/views/widgets/horizontal_raw_widget.dart';
import 'package:multiple_listview_example/views/widgets/title_widget.dart';
import 'package:multiple_listview_example/views/widgets/vertical_raw_widget.dart';class HomePage extends StatelessWidget {const HomePage({Key? key}) : super(key: key);Widget build(BuildContext context) {List products = ProductHelper.getProductList();return Scaffold(backgroundColor: const Color(0xFFF6F5FA),appBar: AppBar(centerTitle: true,title: const Text("Home"),),body: SingleChildScrollView(child: Container(padding: const EdgeInsets.symmetric(vertical: 20),child: Column(crossAxisAlignment: CrossAxisAlignment.start,children: [const TitleWidget(title: "Horizontal List"),const SizedBox(height: 10,),SizedBox(height: 200,child: ListView.builder(shrinkWrap: true,scrollDirection: Axis.horizontal,itemCount: products.length,itemBuilder: (BuildContext context, int index) {return HorizontalRawWidget(product: products[index],);}),),const SizedBox(height: 10,),const TitleWidget(title: "Grid View"),Container(padding:const EdgeInsets.symmetric(horizontal: 15, vertical: 10),child: GridView.builder(gridDelegate:const SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 2,crossAxisSpacing: 13,mainAxisSpacing: 13,childAspectRatio: 1),itemCount: products.length,shrinkWrap: true,physics: const NeverScrollableScrollPhysics(),itemBuilder: (BuildContext context, int index) {return GridViewRawWidget(product: products[index],);}),),const TitleWidget(title: "Vertical List"),ListView.builder(itemCount: products.length,shrinkWrap: true,physics: const NeverScrollableScrollPhysics(),itemBuilder: (BuildContext context, int index) {return VerticalRawWidget(product: products[index],);}),],),),),);}
}
我使用了一个 SingleChildScrollView
widget 作为代码中的顶部根 widget,考虑到我整合了多个布局,如水平列表、网格视图和垂直列表,我将所有这些 widget 包装在一个 Column
widget 中。
挑战在于如何处理多个滚动部件,因为在上述示例中有两个垂直滚动部件:一个网格视图和一个垂直列表视图。为了禁用单个部件的滚动行为, physics
属性被设置为 const NeverScrollableScrollPhysics()
。取而代之的是,使用顶层根 SingleChildScrollView`` 来启用整个内容的滚动。此外,
SingleChildScrollView上的
shrinkWrap属性被设置为
true`,以确保它能紧紧包裹其内容,只占用其子控件所需的空间。
Github 链接:https://github.com/tarunaronno005/flutter-multiple-listview