Flutter ListView scroll animation overlapping sibling widget
2,276
Solution 1
So final code will be. I have added the scroll phisycs BouncingScrollPhysics
.
import 'package:flutter/material.dart';
void main() {
runApp(MyApp(
items: List<MessageItem>.generate(
33,
(i) => MessageItem("Sender $i", "Message body $i"),
),
));
}
class MyApp extends StatelessWidget {
final List<MessageItem> items;
MyApp({Key key, @required this.items}) : super(key: key);
@override
Widget build(BuildContext context) {
final title = 'Mixed List';
return MaterialApp(
title: title,
home: Scaffold(
appBar: AppBar(
title: Text(title),
),
body: Column(
children: [
Expanded(
child: Container(
),
),
Expanded(
child: ListView.builder(
physics: BouncingScrollPhysics(
parent: AlwaysScrollableScrollPhysics()),
itemCount: 50,
itemBuilder: (context, index) {
return ListTile(
title: Text("${index + 1}"),
subtitle: Text("${index + 1}"),
);
},
),
),
],
),
),
);
}
}
/// A ListItem that contains data to display a message.
class MessageItem {
final String sender;
final String body;
MessageItem(this.sender, this.body);
Widget buildTitle(BuildContext context) => Text(sender);
Widget buildSubtitle(BuildContext context) => Text(body);
}
Solution 2
I'm not sure if this is a bug or not. Or if my solution is the correct way of doing it, or not. But this work
@override
Widget build(BuildContext context) {
return NestedScrollView(
headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
return <Widget>[
SliverOverlapAbsorber(
handle: NestedScrollView.sliverOverlapAbsorberHandleFor(context),
sliver: SliverAppBar(
backgroundColor: Colors.white,
toolbarHeight: 200,
pinned: true,
forceElevated: innerBoxIsScrolled,
),
),
];
},
body: Container(
child: SafeArea(
top: false,
bottom: false,
child: Builder(
builder: (BuildContext context) {
return CustomScrollView(
key: PageStorageKey<String>("name"),
slivers: <Widget>[
SliverOverlapInjector(
handle:
NestedScrollView.sliverOverlapAbsorberHandleFor(context),
),
SliverPadding(
padding: const EdgeInsets.all(8.0),
sliver: SliverFixedExtentList(
itemExtent: 48.0,
delegate: SliverChildBuilderDelegate(
(BuildContext context, int index) {
return ListTile(
title: Text('Item $index'),
);
},
childCount: 30,
),
),
),
],
);
},
),
)),
);
}
The reason I don't like this is that I'm putting non-bar content in an AppBar.
If anyone has a better solution please let me know.
Author by
Ali_R
Fullstack developer. More focused and interested in backend
Updated on December 24, 2022Comments
-
Ali_R over 1 year
Hoping someone can help with this and it's not a bug and it's just me being silly.
There is very strange behavior from listview when it's not taking the full length of the screen and in a column.
When you scroll down, the animation at max extent persists and overlaps. I'm assuming this is a bug and not by design.
Here's the simple code to reproduce.
import 'package:flutter/material.dart'; void main() { runApp(MyApp( items: List<MessageItem>.generate( 33, (i) => MessageItem("Sender $i", "Message body $i"), ), )); } class MyApp extends StatelessWidget { final List<MessageItem> items; MyApp({Key key, @required this.items}) : super(key: key); @override Widget build(BuildContext context) { final title = 'Mixed List'; return MaterialApp( title: title, home: Scaffold( appBar: AppBar( title: Text(title), ), body: Column( children: [ Expanded( child: Container(), ), Expanded( child: ListView.builder( itemCount: items.length, itemBuilder: (context, index) { final item = items[index]; return ListTile( title: item.buildTitle(context), subtitle: item.buildSubtitle(context), ); }, ), ), ], ), ), ); } } /// A ListItem that contains data to display a message. class MessageItem { final String sender; final String body; MessageItem(this.sender, this.body); Widget buildTitle(BuildContext context) => Text(sender); Widget buildSubtitle(BuildContext context) => Text(body); }
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Ali_R over 3 yearsPs. Better yet. set appbar height to 0. And put that in a column!
-
Ali_R over 3 yearsThank you for your response. But I want that container there. My issue is the overlapping into the upper container. As you can see in the gif, the blue blob carries onto the upper container. I want fixed content at the top, and, scrolling content in the bottom half
-
Salim Murshed over 3 yearsput some fixed height of container, if you set Expanded, it will do like the gif
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Ali_R over 3 yearsWith the fixed container height this is what it does ibb.co/NWKZc16. Again I've resolved the issue by using nested scroll view. It's an overcomplicated solution to something that should be straight forward.
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Salim Murshed over 3 yearsYou can stop the total overflow