No error message when SliverOverlapAbsorber is omitted #128074
Description
The SliverOverlapAbsorber and SliverOverlapInjector are meant to be used together in the NestedScrollView. If a developer inserts a SliverOverlapInjector into the body of a NestedScrollView and does not make use of a SliverOverlapAbsorber, then the app crashes without a helpful error message:
Null check operator used on a null value
This is very hard to understand why and how to fix. 🙃
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
body: NestedScrollView(
headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
return <Widget>[
const SliverAppBar(),
];
},
body: Builder(builder: (BuildContext context) {
return CustomScrollView(
slivers: <Widget>[
SliverOverlapInjector(
handle:
NestedScrollView.sliverOverlapAbsorberHandleFor(context),
),
],
);
}),
),
),
);
}
}