Flutter CustomScrollView slivers stacking - flutter

Question

I am trying to create a scrollView using CustomScrollView.
The effect that I need, is very similar to this one.
I need the SliverList to be stacked above the SliverAppbar, without the list taking the whole screen and hiding the SliverAppbar.
The reason I want to do this, is that i need to attach a persistent Positioned widget on top of that list, and it won't appear unless the list is stacked above the SliverAppbar.
Here's my code.

Answer 1

Step one:
Use ListView inside SliverAppBar widget. To make css overflow:hidden effect.
Step two:
Add controller to NestedScrollView and move the button on scrolling in a stack. Plus calculate where you want to stop button moving.
class MyHomePage extends StatefulWidget {
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
ScrollController scrollController;
final double expandedHight = 150.0;
#override
void initState() {
super.initState();
scrollController = new ScrollController();
scrollController.addListener(() => setState(() {}));
}
#override
void dispose() {
scrollController.dispose();
super.dispose();
}
double get top {
double res = expandedHight;
if (scrollController.hasClients) {
double offset = scrollController.offset;
if (offset < (res - kToolbarHeight)) {
res -= offset;
} else {
res = kToolbarHeight;
}
}
return res;
}
#override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.black,
body: Stack(
children: [
NestedScrollView(
controller: scrollController,
headerSliverBuilder: (context, value) {
return [
SliverAppBar(
pinned: true,
expandedHeight: expandedHight,
flexibleSpace: ListView(
physics: const NeverScrollableScrollPhysics(),
children: [
AppBar(
title: Text('AfroJack'),
elevation: 0.0,
),
Container(
color: Colors.blue,
height: 100,
alignment: Alignment.center,
child: RaisedButton(
child: Text('folow'),
onPressed: () => print('folow pressed'),
),
),
],
),
),
];
},
body: ListView.builder(
physics: const NeverScrollableScrollPhysics(),
itemCount: 80,
itemBuilder: (BuildContext context, int index) {
return Text(
'text_string'.toUpperCase(),
style: TextStyle(
color: Colors.white,
),
);
},
),
),
Positioned(
top: top,
width: MediaQuery.of(context).size.width,
child: Align(
child: RaisedButton(
onPressed: () => print('shuffle pressed'),
child: Text('Suffle'),
),
),
),
],
),
);
}
}