When shrinkWrap is true, the SliverAppBar is displayed below the elements of the SliverList or SliverGrid. #28197
Description
Steps to Reproduce
-
here is the code repository to reproduce the bug.
-
Normally, when the
shrinkWrapof theCustomScrollViewisfalse, the floatingSliverAppBarwill be displayed on the upper layer of theSliverListorSliverGridas we slide theSliverListdown.
- But, when change the value of
shrinkWraptotrue, theSliverAppBaris displayed below the elements of theSliverListorSliverGrid.
Why does shrinkWrap affect the display of SliverAppBar?
flutter analyze
localhost:a_custom_scroll_view_bug luoqiao$ flutter analyze
Analyzing a_custom_scroll_view_bug...
No issues found! (ran in 2.7s)
localhost:a_custom_scroll_view_bug luoqiao$
flutter doctor -v
localhost:a_custom_scroll_view_bug luoqiao$ flutter doctor -v
[✓] Flutter (Channel stable, v1.0.0, on Mac OS X 10.14.3 18D109, locale zh-Hans-CN)
• Flutter version 1.0.0 at /Users/luoqiao/flutter/flutter_v1.0.0-stable
• Framework revision 5391447fae (3 months ago), 2018-11-29 19:41:26 -0800
• Engine revision 7375a0f414
• Dart version 2.1.0 (build 2.1.0-dev.9.4 f9ebf21297)
[✓] Android toolchain - develop for Android devices (Android SDK 28.0.3)
• Android SDK at /Users/luoqiao/Library/Android/sdk
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-28, build-tools 28.0.3
• ANDROID_HOME = /Users/luoqiao/Library/Android/sdk
• Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b01)
• All Android licenses accepted.
[✓] iOS toolchain - develop for iOS devices (Xcode 10.1)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 10.1, Build version 10B61
• ios-deploy 2.0.0
• CocoaPods version 1.5.3
[✓] Android Studio (version 3.1)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin version 29.0.1
• Dart plugin version 173.4700
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b01)
[✓] IntelliJ IDEA Ultimate Edition (version 2018.1.5)
• IntelliJ at /Applications/IntelliJ IDEA.app
• Flutter plugin version 29.0.2
• Dart plugin version 181.4892.1
[!] VS Code (version 1.31.1)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension not installed; install from
https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter
[✓] Connected device (1 available)
• Android SDK built for x86 • emulator-5554 • android-x86 • Android 9 (API 28) (emulator)
! Doctor found issues in 1 category.
localhost:a_custom_scroll_view_bug luoqiao$
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
@override
Widget build(BuildContext context) {
return CustomScrollView(
shrinkWrap: false,
slivers: <Widget>[
const SliverAppBar(
pinned: false,
floating: true,
//expandedHeight: 250.0,
//backgroundColor: Colors.purpleAccent,
flexibleSpace: FlexibleSpaceBar(
title: Text('SliverAPPBar'),
),
),
SliverGrid.count(
crossAxisCount: 3,
children: [
Padding(
padding: EdgeInsets.only(left: 24.0, right: 24.0),
child: Container(color: Colors.red, height: 150.0),
),
Padding(
padding: EdgeInsets.only(left: 24.0, right: 24.0),
child: Container(color: Colors.purple, height: 150.0),
),
Padding(
padding: EdgeInsets.only(left: 24.0, right: 24.0),
child: Container(color: Colors.green, height: 150.0),
),
Padding(
padding: EdgeInsets.only(left: 24.0, right: 24.0),
child: Container(color: Colors.orange, height: 150.0),
),
Padding(
padding: EdgeInsets.only(left: 24.0, right: 24.0),
child: Container(color: Colors.yellow, height: 150.0),
),
Padding(
padding: EdgeInsets.only(left: 24.0, right: 24.0),
child: Container(color: Colors.pink, height: 150.0),
),
Padding(
padding: EdgeInsets.only(left: 24.0, right: 24.0),
child: Container(color: Colors.cyan, height: 150.0),
),
Padding(
padding: EdgeInsets.only(left: 24.0, right: 24.0),
child: Container(color: Colors.indigo, height: 150.0),
),
Padding(
padding: EdgeInsets.only(left: 24.0, right: 24.0),
child: Container(color: Colors.blue, height: 150.0),
),
],
),
SliverList(
delegate: SliverChildListDelegate(
[
Padding(
padding: EdgeInsets.only(left: 24.0, right: 24.0),
child: Container(color: Colors.pink, height: 100.0),
),
Padding(
padding: EdgeInsets.only(left: 24.0, right: 24.0),
child: Container(color: Colors.cyan, height: 100.0),
),
Padding(
padding: EdgeInsets.only(left: 24.0, right: 24.0),
child: Container(color: Colors.indigo, height: 100.0),
),
Padding(
padding: EdgeInsets.only(left: 24.0, right: 24.0),
child: Container(color: Colors.blue, height: 100.0),
),
Padding(
padding: EdgeInsets.only(left: 24.0, right: 24.0),
child: Container(color: Colors.yellow, height: 100.0),
),
],
),
),
SliverFixedExtentList(
itemExtent: 150.0,
delegate: SliverChildListDelegate(
[
Padding(
padding: EdgeInsets.only(left: 24.0, right: 24.0),
child: Container(color: Colors.red, height: 150.0),
),
Padding(
padding: EdgeInsets.only(left: 24.0, right: 24.0),
child: Container(color: Colors.purple, height: 150.0),
),
Padding(
padding: EdgeInsets.only(left: 24.0, right: 24.0),
child: Container(color: Colors.green, height: 150.0),
),
Padding(
padding: EdgeInsets.only(left: 24.0, right: 24.0),
child: Container(color: Colors.orange, height: 150.0),
),
Padding(
padding: EdgeInsets.only(left: 24.0, right: 24.0),
child: Container(color: Colors.yellow, height: 150.0),
),
Padding(
padding: EdgeInsets.only(left: 24.0, right: 24.0),
child: Container(color: Colors.pink, height: 150.0),
),
Padding(
padding: EdgeInsets.only(left: 24.0, right: 24.0),
child: Container(color: Colors.cyan, height: 150.0),
),
Padding(
padding: EdgeInsets.only(left: 24.0, right: 24.0),
child: Container(color: Colors.indigo, height: 150.0),
),
Padding(
padding: EdgeInsets.only(left: 24.0, right: 24.0),
child: Container(color: Colors.blue, height: 150.0),
),
],
),
),
],
);
}
}