| // Copyright 2014 The Flutter Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| import 'package:flutter/widgets.dart'; |
| import 'package:flutter_test/flutter_test.dart'; |
| |
| class Foo extends StatefulWidget { |
| const Foo({ Key key }) : super(key: key); |
| @override |
| FooState createState() => FooState(); |
| } |
| |
| class FooState extends State<Foo> { |
| ScrollController scrollController = ScrollController(); |
| |
| @override |
| Widget build(BuildContext context) { |
| return LayoutBuilder( |
| builder: (BuildContext context, BoxConstraints constraints) { |
| return ScrollConfiguration( |
| behavior: FooScrollBehavior(), |
| child: ListView( |
| controller: scrollController, |
| children: <Widget>[ |
| GestureDetector( |
| onTap: () { |
| setState(() { /* this is needed to trigger the original bug this is regression-testing */ }); |
| scrollController.animateTo(200.0, duration: const Duration(milliseconds: 500), curve: Curves.linear); |
| }, |
| child: const DecoratedBox( |
| decoration: BoxDecoration(color: Color(0x00000000)), |
| child: SizedBox( |
| height: 200.0, |
| ), |
| ), |
| ), |
| const DecoratedBox( |
| decoration: BoxDecoration(color: Color(0x00000000)), |
| child: SizedBox( |
| height: 200.0, |
| ), |
| ), |
| const DecoratedBox( |
| decoration: BoxDecoration(color: Color(0x00000000)), |
| child: SizedBox( |
| height: 200.0, |
| ), |
| ), |
| const DecoratedBox( |
| decoration: BoxDecoration(color: Color(0x00000000)), |
| child: SizedBox( |
| height: 200.0, |
| ), |
| ), |
| const DecoratedBox( |
| decoration: BoxDecoration(color: Color(0x00000000)), |
| child: SizedBox( |
| height: 200.0, |
| ), |
| ), |
| const DecoratedBox( |
| decoration: BoxDecoration(color: Color(0x00000000)), |
| child: SizedBox( |
| height: 200.0, |
| ), |
| ), |
| ], |
| ), |
| ); |
| } |
| ); |
| } |
| } |
| |
| class FooScrollBehavior extends ScrollBehavior { |
| @override |
| bool shouldNotify(FooScrollBehavior old) => true; |
| } |
| |
| void main() { |
| testWidgets('Can animate scroll after setState', (WidgetTester tester) async { |
| await tester.pumpWidget( |
| const Directionality( |
| textDirection: TextDirection.ltr, |
| child: Foo(), |
| ), |
| ); |
| expect(tester.state<ScrollableState>(find.byType(Scrollable)).position.pixels, 0.0); |
| await tester.tap(find.byType(GestureDetector).first); |
| await tester.pumpAndSettle(); |
| expect(tester.state<ScrollableState>(find.byType(Scrollable)).position.pixels, 200.0); |
| }); |
| } |