颤动网：怎么以阶梯形式进行水平滚动？

本教程将介绍颤动网：如何以阶梯形式进行水平滚动？的处理方法，这篇教程是从别的地方看到的，然后加了一些国外程序员的疑问与解答，希望能对你有所帮助，好了，下面开始学习吧。

问题描述

我正在尝试用Stepper制作一个颤动的网页表单，我正在为小尺寸的屏幕做这个实验。我已经使用Physical：ClampingScrollPhysical()方法完成了垂直滚动。但是，我无法在步进台阶内进行水平滚动。我想让单选按钮可以水平滚动，这样错误消息就会隐藏起来，如果文本从屏幕上消失，用户就可以滚动到该部分。我已经使用了SingleChildCcrollView(crollDirection：Axis.Horizular)，但它不起作用。图像为

颤振程序代码如下：-

import 'package:flutter/material.dart';

void main() => runApp(new MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
 return new MaterialApp(
title: 'Flutter Stepper Demo',
theme: new ThemeData(
  primarySwatch: Colors.blue,
),
home: new MyHomePage(title: 'Stepper Tutorial'),
 );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);
  final String title;

  @override
  _MyHomePageState createState() => new _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _currentStep = 0;
  TextEditingController nameController = TextEditingController();
  TextEditingController emailController = TextEditingController();
  TextEditingController addressController = TextEditingController();
  List<String> demoList = [];

  @override
  Widget build(BuildContext context) {
 return new Scaffold(
appBar: new AppBar(
  title: new Text(widget.title),
),
body: Column(
  children: <Widget>[
 Row(
mainAxisAlignment: MainAxisAlignment.start,
 ),
 Expanded(
child: SingleChildScrollView(
  // scrollDirection: Axis.horizontal,
  child: Stepper(
 physics: ClampingScrollPhysics(),
 steps: _mySteps(),
 currentStep: this._currentStep,
 onStepTapped: (step) {
setState(
  () {
 this._currentStep = step;
  },
);
 },
 onStepContinue: () {
setState(
  () {
 if (this._currentStep < this._mySteps().length - 1) {
this._currentStep = this._currentStep + 1;
 }
  },
);
 },
 onStepCancel: () {
setState(
  () {
 if (this._currentStep > 0) {
this._currentStep = this._currentStep - 1;
 } else {
this._currentStep = 0;
 }
  },
);
 },
  ),
),
 ),
 demoList.isEmpty
  ? Text("")
  : Column(
children: demoList.map((e) {
  return Text(e);
}).toList(),
 ),
 ElevatedButton(
onPressed: () {
  demoList = [];
  viewList();
},
child: Text("Click to see List"),
 ),
  ],
),
 );
  }

  viewList() {
 if (nameController.text.isEmpty ||
  emailController.text.isEmpty ||
  addressController.text.isEmpty) {
setState(
  () {
 if (nameController.text.isEmpty) {
demoList.add("Name field is empty");
 } else if (emailController.text.isEmpty) {
demoList.add("Email field is Empty");
 } else if (addressController.text.isEmpty) {
demoList.add("Address field is empty");
 }
  },
);
 } else {
demoList.add(nameController.text);
demoList.add(emailController.text);
demoList.add(addressController.text);

setState(
  () {
 demoList = demoList;
  },
);
 }
  }

  List<Step> _mySteps() {
 List<Step> _steps = [
Step(
  title: Text('Name'),
  content: TextField(
 controller: nameController,
  ),
  isActive: _currentStep >= 0,
),
Step(
  title: Text('Email'),
  content: TextField(
 controller: emailController,
  ),
  isActive: _currentStep >= 1,
),
Step(
  title: Text('Address'),
  content: TextField(
 controller: addressController,
  ),
  isActive: _currentStep >= 2,
),
Step(
  title: Text('Number'),
  content: Row(
 children: <Widget>[
SingleChildScrollView(
  physics: ClampingScrollPhysics(),
),
SafeArea(
  child: SingleChildScrollView(
 scrollDirection: Axis.horizontal,
 child: Form(
child: Row(
  children: <Widget>[
 Radio(
value: "1",
 ),
 Text("1"),
 Radio(
value: "2",
 ),
 Text("2"),
 Radio(
value: "3",
 ),
 Text("3"),
 Radio(
value: "4",
 ),
 Text("4"),
 Radio(
value: "5",
 ),
 Text("5"),
 Radio(
value: "6",
 ),
 Text("6"),
 Radio(
value: "7",
 ),
 Text("7"),
 Radio(
value: "8",
 ),
 Text("8"),
 Radio(
value: "9",
 ),
 Text("9"),
  ],
),
 ),
  ),
)
 ],
  ),
  isActive: _currentStep >= 2,
),
 ];
 return _steps;
  }
}

推荐答案

您可以只使用ListView并将scrollDirection设置为水平。存在Container是因为它需要某种东西来指定大小。

Step(
  title: Text('Number'),
  content: Container(
 height: 100,
 child: ListView(
scrollDirection: Axis.horizontal,
children: [
  Radio(
 value: "1",
  ),
  Center(child: Text("1")),
  Radio(
 value: "2",
  ),
  Center(child: Text("1")),
  Radio(
 value: "3",
  ),
  Center(child: Text("3")),
  Radio(
 value: "4",
  ),
  Center(child: Text("4")),
  Radio(
 value: "5",
  ),
  Center(child: Text("5")),
  Radio(
 value: "6",
  ),
  Center(child: Text("6")),
  Radio(
 value: "7",
  ),
  Center(child: Text("7")),
  Radio(
 value: "8",
  ),
  Center(child: Text("8")),
  Radio(
 value: "9",
  ),
  Center(child: Text("9")),
],
 ),
  ),
  isActive: _currentStep >= 2,
),

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