Created
July 31, 2020 11:36
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Custom Sliver with Toolbar Ellipsis behind
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import 'package:flutter/material.dart'; | |
final Color darkBlue = Color.fromARGB(255, 18, 32, 47); | |
void main() { | |
runApp(MyApp()); | |
} | |
class MyApp extends StatelessWidget { | |
@override | |
Widget build(BuildContext context) { | |
return MaterialApp( | |
theme: ThemeData.light(), | |
debugShowCheckedModeBanner: false, | |
home: Scaffold( | |
body: Center( | |
child: CustomSliver(), | |
), | |
), | |
); | |
} | |
} | |
class CustomSliver extends StatefulWidget { | |
@override | |
_CustomSliverState createState() => _CustomSliverState(); | |
} | |
class _CustomSliverState extends State<CustomSliver> { | |
final double _max = 200; | |
final double _min = 96; | |
ScrollController _controller; | |
double _ellipsisTop; | |
bool _isLoading = false; | |
@override | |
void initState() { | |
_ellipsisTop = _max; | |
super.initState(); | |
_controller = ScrollController(); | |
_controller.addListener(() { | |
print(_controller.offset); | |
setState(() { | |
if (_controller.offset < _min) { | |
_ellipsisTop = _max - _controller.offset; | |
} else if (_controller.offset == 0) { | |
_ellipsisTop = _max; | |
} | |
}); | |
}); | |
} | |
@override | |
Widget build(BuildContext context) { | |
return Scaffold( | |
body: Stack( | |
children: [ | |
Container( | |
height: _ellipsisTop, | |
decoration: BoxDecoration( | |
color: Colors.red, | |
borderRadius: BorderRadius.vertical( | |
top: Radius.zero, | |
bottom: Radius.elliptical(100, 40), | |
), | |
), | |
), | |
CustomScrollView( | |
controller: _controller, | |
physics: ClampingScrollPhysics(), | |
slivers: [ | |
SliverAppBar( | |
elevation: 0, | |
pinned: true, | |
centerTitle: true, | |
expandedHeight: 150, | |
flexibleSpace: Container( | |
decoration: BoxDecoration( | |
gradient: LinearGradient( | |
colors: [Colors.yellow, Colors.red], | |
begin: Alignment.topCenter, | |
end: Alignment.bottomCenter, | |
), | |
), | |
child: FlexibleSpaceBar( | |
title:Text( | |
"This is the app title", | |
textAlign: TextAlign.center, | |
maxLines: 2, | |
), | |
), | |
), | |
), | |
SliverList( | |
delegate: SliverChildListDelegate( | |
List.generate(100, (int index) => Text("Item $index"),),), | |
), | |
], | |
), | |
if (_isLoading) | |
Center( | |
child: CircularProgressIndicator(), | |
), | |
], | |
), | |
); | |
} | |
} |
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