Fixed buttons between AppBar and SingleChildScrollView (Flutter) - flutter

Question

I would like to include buttons between AppBar and ListView. In the example below, the buttons scroll along with the text. I tried to include the SingleChildScrollView within a Column, but was unsuccessful.
I read that the Column widget does not support scrolling. I already searched a lot, but I didn't find an example similar to what I need.
Can someone help me?
#override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text('A Idade do Lobo'),
elevation: 0.0,
backgroundColor: COLOR_MAIN,
),
body: NotificationListener(
onNotification: (notif) {
if (_hasScroll) {
if (notif is ScrollEndNotification && scrollOn) {
Timer(Duration(seconds: 1), () {
_scroll();
setState(() {
_controlButton();
});
});
}
}
return true;
},
child: SingleChildScrollView(
controller: _scrollController,
child: new Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
new Center(
child: new Row(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
new RaisedButton(
onPressed: _showScrollPickerDialog,
child: Text('Rolagem ${_scrollSpeed}'),
),
new RaisedButton(
onPressed: _showTomPickerDialog,
child: Text('TOM ${_tom}'),
),
],
),
),
new Flexible(
fit: FlexFit.loose,
child: new ListView.builder(
shrinkWrap: true,
itemCount: _songDetails.length,
itemBuilder: (context, index) {
return new Column(
mainAxisSize: MainAxisSize.min,
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Padding(
padding: new EdgeInsets.all(5.0),
child: new RichText(
text: TextSpan(children: [
new TextSpan(
text: '${_songDetails[index].line}',
style: _getStyle(
_songDetails[index].type,
),
),
]),
),
),
],
);
},
),
),
],
),
),
),
floatingActionButton: _controlButton(),
);
}
}

Answer 1

You can use bottom properly of AppBar to achieve desire UI.
Following example clear your idea.
import 'package:flutter/material.dart';
class DeleteWidget extends StatefulWidget {
const DeleteWidget({Key key}) : super(key: key);
#override
_DeleteWidgetState createState() => _DeleteWidgetState();
}
class _DeleteWidgetState extends State<DeleteWidget> {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("your title"),
bottom: PreferredSize(
preferredSize: Size(MediaQuery.of(context).size.width, 40),
child: Center(
child: new Row(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
new RaisedButton(
onPressed: () {},
child: Text('Rolagem '),
),
new RaisedButton(
onPressed: () {},
child: Text('TOM '),
),
],
),
),
),
),
body: Container(
child: ListView.builder(
itemBuilder: (context, int index) {
return Text(index.toString());
},
itemCount: 100,
),
));
}
}