[英]How to create overlapping sliverlist container in flutter
I need to have something like attached image where below container is overlapping sliverappbar.我需要有类似附加图像的东西,其中下面的容器与 sliverappbar 重叠。 Any help?
有什么帮助吗?
https://i.stack.imgur.com/JY1iH.jpg https://i.stack.imgur.com/JY1iH.jpg
this is quite similar to your case, SliverAppBar , you can try to modify the position of middle part:这与您的情况非常相似, SliverAppBar ,您可以尝试修改中间部分的 position :
class Sample2 extends StatelessWidget {
@override
Widget build(BuildContext context) {
return SafeArea(
child: Material(
child: CustomScrollView(
slivers: [
SliverPersistentHeader(
delegate: MySliverAppBar(expandedHeight: 200),
pinned: true,
),
SliverList(
delegate: SliverChildBuilderDelegate(
(_, index) => ListTile(
title: Text("Index: $index"),
),
),
)
],
),
),
);
}
}
class MySliverAppBar extends SliverPersistentHeaderDelegate {
final double expandedHeight;
MySliverAppBar({@required this.expandedHeight});
@override
Widget build(
BuildContext context, double shrinkOffset, bool overlapsContent) {
return Stack(
fit: StackFit.expand,
overflow: Overflow.visible,
children: [
Image.network(
"https://images.pexels.com/photos/396547/pexels-photo-396547.jpeg?auto=compress&cs=tinysrgb&dpr=1&w=500",
fit: BoxFit.cover,
),
Center(
child: Opacity(
opacity: shrinkOffset / expandedHeight,
child: Text(
"MySliverAppBar",
style: TextStyle(
color: Colors.white,
fontWeight: FontWeight.w700,
fontSize: 23,
),
),
),
),
Positioned(
top: expandedHeight / 2 - shrinkOffset,
left: MediaQuery.of(context).size.width / 4,
child: Opacity(
opacity: (1 - shrinkOffset / expandedHeight),
child: Card(
elevation: 10,
child: SizedBox(
height: expandedHeight,
width: MediaQuery.of(context).size.width / 2,
child: FlutterLogo(),
),
),
),
),
],
);
}
@override
double get maxExtent => expandedHeight;
@override
double get minExtent => kToolbarHeight;
@override
bool shouldRebuild(SliverPersistentHeaderDelegate oldDelegate) => true;
}
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