Flutter CustomScrollView „stick“ card on top - flutter

Question

I want to create a list in Flutter with a small preview of the content before the user sees all information on a new screen.
Therefor I build a simple list with Sliver-Cards:
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Cards'),
backgroundColor: Colors.blue,
),
body: Padding(
padding: const EdgeInsets.symmetric(horizontal: 5),
child: CustomScrollView(
shrinkWrap: false,
slivers: <Widget>[
_buildHeader(),
_buildCard('1', Colors.white, Colors.red, Colors.transparent),
_buildCard('2', Colors.white, Colors.blue, Colors.red),
_buildCard('3', Colors.white, Colors.green, Colors.blue),
…
],
),
),
);
}
Widget _buildHeader() => SliverStickyHeader(
header: Container(
height: 50,
color: Colors.white,
padding: const EdgeInsets.symmetric(horizontal: 16),
alignment: Alignment.topLeft,
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: const [
Center(
child: Text(
"Card-Header",
style: TextStyle(
fontWeight: FontWeight.bold, color: Colors.black),
),
),
],
),
),
sliver: SliverToBoxAdapter(
child: Container(
height: 20,
),
),
);
Widget _buildCard(
String logo, Color logoColor, Color cardColor, Color prevColor) =>
SliverStickyHeader(
header: GestureDetector(
child: Stack(
children: <Widget>[
Container(
height: 16,
color: prevColor,
),
Container(
height: 60,
decoration: BoxDecoration(
color: cardColor,
borderRadius: const BorderRadius.only(
topLeft: Radius.circular(16),
topRight: Radius.circular(16))),
padding: const EdgeInsets.symmetric(horizontal: 16),
alignment: Alignment.bottomLeft,
child: Text(
logo,
style:
TextStyle(color: logoColor, fontWeight: FontWeight.bold),
),
),
],
),
),
sliver: SliverToBoxAdapter(
child: Container(
height: 20,
color: cardColor,
),
),
);
Here’s a Screenshot:
The only thing missing is the method to show a small preview of the content, which I want to stick to the top of the list. For example, anything like in this GitHub post: https://github.com/loopeer/CardStackView/blob/master/screenshot/screenshot1.gif
Is it possible to create a method like this in flutter?