Flutter 颤振:步进电机不';滚动

Flutter 颤振:步进电机不';滚动,flutter,stepper,Flutter,Stepper,我想做一个按钮波纹步进器。问题是,如果我将其包装在列或列表视图中,在Stepper中滚动将不起作用。我试图用NestedScrollView包装它们,滚动正在工作,但问题是按钮贴在了Stepper上面。代码中有两个_MyHomePageState示例,第一个是ListView,第二个是NestedView,这两个示例都不适用于我。我如何实现按钮下的步进器 这就是我想要的 导入“包装:颤振/材料.省道”; void main()=>runApp(MyApp()); 类MyApp扩展了无状态小部件

我想做一个按钮波纹步进器。问题是,如果我将其包装在列或列表视图中,在Stepper中滚动将不起作用。我试图用NestedScrollView包装它们,滚动正在工作,但问题是按钮贴在了Stepper上面。代码中有两个_MyHomePageState示例,第一个是ListView,第二个是NestedView,这两个示例都不适用于我。我如何实现按钮下的步进器

这就是我想要的

导入“包装:颤振/材料.省道”;
void main()=>runApp(MyApp());
类MyApp扩展了无状态小部件{
@凌驾
小部件构建(构建上下文){
返回材料PP(
标题:“颤振演示”,
主题:主题数据(
主样本:颜色。蓝色,
),
主页:MyHomePage(标题:“颤振演示主页”),
);
}
}
类MyHomePage扩展StatefulWidget{
MyHomePage({Key,this.title}):超级(Key:Key);
最后的字符串标题;
@凌驾
_MyHomePageState createState()=>\u MyHomePageState();
}
//带有ListView的1个案例(不滚动)
类_MyHomePageState扩展状态{
int _currentStep=0;
@凌驾
小部件构建(构建上下文){
返回脚手架(
appBar:appBar(
背景颜色:Colors.white,
iconTheme:IconThemeData(颜色:Colors.red),
),
正文:表格(
子:ListView(
儿童:[
步进机(
类型:StepperType.vertical,
currentStep:_currentStep,
onstep:(int索引){
设置状态(){
_currentStep=索引;
});
},
步骤:[
台阶(
标题:文本(“步骤1”),
内容:专栏(
儿童:[
TextFormField(
装饰:输入装饰(
labelText:“城市”,边框:UnderlineInputBorder()),
),
TextFormField(
装饰:输入装饰(标签文本:“名称”),
),
TextFormField(
装饰:输入装饰(标签文本:“地址”),
),
],
),
是的,
),
台阶(
标题:文本(“步骤2”),
内容:专栏(
儿童:[
TextFormField(
装饰:输入装饰(标签文本:“城市”),
),
TextFormField(
装饰:输入装饰(标签文本:“名称”),
),
TextFormField(
装饰:输入装饰(标签文本:“地址”),
),
],
),
是的,
),
台阶(
标题:文本(“步骤3”),
内容:专栏(
儿童:[
TextFormField(
装饰:输入装饰(标签文本:“宽度”),
),
TextFormField(
装饰:输入装饰(标签文本:“长度”),
),
TextFormField(
装饰:输入装饰(标签文本:“高度”),
),
TextFormField(
装饰:输入装饰(labelText:“Weigth”),
),
],
),
是的,
),
],
),
升起的按钮(
子项:文本(“按钮”),
按下:(){},
)
],
),
),
);
}
} 
//2个带有嵌套滚动视图的案例
类_MyHomePageState扩展状态{
int _currentStep=0;
@凌驾
小部件构建(构建上下文){
返回脚手架(
appBar:appBar(
背景颜色:Colors.white,
iconTheme:IconThemeData(颜色:Colors.red),
),
正文:表格(
子:嵌套滚动视图(
headerSliverBuilder:(BuildContext上下文,boolInnerBoxIsCrolled){
返回[
银表(
委托:SliverChildListDelegate([
升起的按钮(
子项:文本(“按钮”),
按下:(){},
)
]),
),
];
},
机身:步进电机(
类型:StepperType.vertical,
currentStep:_currentStep,
onstep:(int索引){
设置状态(){
_currentStep=索引;
});
},
步骤:[
台阶(
标题:文本(“步骤1”),
内容:专栏(
儿童:[
TextFormField(
装饰:输入装饰(
labelText:“城市”,边框:UnderlineInputBorder()),
),
TextFormField(
装饰:输入装饰(标签文本:“名称”),
),
TextFormField(
装饰:输入装饰(标签文本:“地址”),
),
],
),
是的,
),
台阶(
标题:文本(“步骤2”),
内容:专栏(
儿童:[
TextFormField(
装饰:输入装饰(标签文本:“城市”),
),
TextFormField(
装饰:输入装饰(标签文本:“名称”),
),
import 'package:flutter/material.dart';

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

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

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

  final String title;

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

// 1 case with ListView (doesn't scroll)
class _MyHomePageState extends State<MyHomePage> {
  int _currentStep = 0;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Colors.white,
        iconTheme: IconThemeData(color: Colors.red),
      ),
      body: Form(
        child: ListView(
          children: <Widget>[
            Stepper(
              type: StepperType.vertical,
              currentStep: _currentStep,
              onStepTapped: (int index) {
                setState(() {
                  _currentStep = index;
                });
              },
              steps: [
                Step(
                  title: Text('Step 1'),
                  content: Column(
                    children: <Widget>[
                      TextFormField(
                        decoration: InputDecoration(
                            labelText: 'City', border: UnderlineInputBorder()),
                      ),
                      TextFormField(
                        decoration: InputDecoration(labelText: 'Name'),
                      ),
                      TextFormField(
                        decoration: InputDecoration(labelText: 'Address'),
                      ),
                    ],
                  ),
                  isActive: true,
                ),
                Step(
                  title: Text('Step 2'),
                  content: Column(
                    children: <Widget>[
                      TextFormField(
                        decoration: InputDecoration(labelText: 'City'),
                      ),
                      TextFormField(
                        decoration: InputDecoration(labelText: 'Name'),
                      ),
                      TextFormField(
                        decoration: InputDecoration(labelText: 'Address'),
                      ),
                    ],
                  ),
                  isActive: true,
                ),
                Step(
                  title: Text('Step 3'),
                  content: Column(
                    children: <Widget>[
                      TextFormField(
                        decoration: InputDecoration(labelText: 'Width'),
                      ),
                      TextFormField(
                        decoration: InputDecoration(labelText: 'Length'),
                      ),
                      TextFormField(
                        decoration: InputDecoration(labelText: 'Height'),
                      ),
                      TextFormField(
                        decoration: InputDecoration(labelText: 'Weigth'),
                      ),
                    ],
                  ),
                  isActive: true,
                ),
              ],
            ),
            RaisedButton(
              child: Text('Button'),
              onPressed: () {},
            )
          ],
        ),
      ),
    );
  }
} 

// 2 case with NestedScrollView
class _MyHomePageState extends State<MyHomePage> {
  int _currentStep = 0;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Colors.white,
        iconTheme: IconThemeData(color: Colors.red),
      ),
      body: Form(
        child: NestedScrollView(
          headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
            return <Widget>[
              SliverList(
                delegate: SliverChildListDelegate(<Widget>[
                  RaisedButton(
                    child: Text('Button'),
                    onPressed: () {},
                  )
                ]),
              ),
            ];
          },
          body: Stepper(
            type: StepperType.vertical,
            currentStep: _currentStep,
            onStepTapped: (int index) {
              setState(() {
                _currentStep = index;
              });
            },
            steps: [
              Step(
                title: Text('Step 1'),
                content: Column(
                  children: <Widget>[
                    TextFormField(
                      decoration: InputDecoration(
                          labelText: 'City', border: UnderlineInputBorder()),
                    ),
                    TextFormField(
                      decoration: InputDecoration(labelText: 'Name'),
                    ),
                    TextFormField(
                      decoration: InputDecoration(labelText: 'Address'),
                    ),
                  ],
                ),
                isActive: true,
              ),
              Step(
                title: Text('Step 2'),
                content: Column(
                  children: <Widget>[
                    TextFormField(
                      decoration: InputDecoration(labelText: 'City'),
                    ),
                    TextFormField(
                      decoration: InputDecoration(labelText: 'Name'),
                    ),
                    TextFormField(
                      decoration: InputDecoration(labelText: 'Address'),
                    ),
                  ],
                ),
                isActive: true,
              ),
              Step(
                title: Text('Step 3'),
                content: Column(
                  children: <Widget>[
                    TextFormField(
                      decoration: InputDecoration(labelText: 'Width'),
                    ),
                    TextFormField(
                      decoration: InputDecoration(labelText: 'Length'),
                    ),
                    TextFormField(
                      decoration: InputDecoration(labelText: 'Height'),
                    ),
                    TextFormField(
                      decoration: InputDecoration(labelText: 'Weigth'),
                    ),
                  ],
                ),
                isActive: true,
              ),
            ],
          ),
        ),
      ),
    );
  }
}
physics: ClampingScrollPhysics(),