flutter-橫向列表

代碼：

// This is a basic Flutter widget test.
//
// To perform an interaction with a widget in your test, use the WidgetTester
// utility that Flutter provides. For example, you can send tap and scroll
// gestures. You can also use WidgetTester to find child widgets in the widget
// tree, read text, and verify that the values of widget properties are correct.

import 'package:flutter/material.dart';


class User  {
  final String name;
  final String description;
  bool isSelect = false;
  User(this.name, this.description);
  IconData icons() {
    if (isSelect) {
       return  Icons.fastfood;
    }else{
      return Icons.ac_unit;
    }
  }
  bool IsSelect(){
    return isSelect;
  }
  void setSelect(){
    isSelect = !isSelect;
  }
}


List users = new List.generate(50, (i) => new User('xiaobai $i', 'index $i'));

void main() {
  runApp(
      new MaterialApp(
        title: 'list',
        home: UserChoiceListWidge(),
  ));
}

class UserChoiceListWidge extends StatefulWidget {
  @override
  State createState() => new UserList();
}


class UserList extends State  {
  void changeLeading(int index) {
    setState(() {
      print("setState");
      print(users[index].name);
      users[index].setSelect();
    });
  }
  @override
  Widget build(BuildContext context) {
    print("setState");
    return  new Scaffold(appBar:  new AppBar(
      title: new Text('test'),
    ),
      body:  new ListView.builder(
        scrollDirection: Axis.horizontal,
        itemCount: users.length,
        itemBuilder: (context, index) { 
          return Container(color: Colors.white ,margin: EdgeInsets.only(top: 10),width: 80,height: 40,
            child:  GestureDetector(
              onTap: (){
              this.changeLeading(index);
              },
              child: Icon(users[index].icons()),
            )
          );

        },
          )
      );
  }
}

效果：