| // 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'; |
| |
| void main() { |
| testWidgets('TrackingScrollController saves offset', (WidgetTester tester) async { |
| final TrackingScrollController controller = TrackingScrollController(); |
| const double listItemHeight = 100.0; |
| |
| await tester.pumpWidget( |
| Directionality( |
| textDirection: TextDirection.ltr, |
| child: PageView.builder( |
| itemBuilder: (BuildContext context, int index) { |
| return ListView( |
| controller: controller, |
| children: List<Widget>.generate( |
| 10, |
| (int i) => Container( |
| height: listItemHeight, |
| child: Text('Page$index-Item$i'), |
| ), |
| ).toList(), |
| ); |
| }, |
| ), |
| ), |
| ); |
| |
| expect(find.text('Page0-Item1'), findsOneWidget); |
| expect(find.text('Page1-Item1'), findsNothing); |
| expect(find.text('Page2-Item0'), findsNothing); |
| expect(find.text('Page2-Item1'), findsNothing); |
| |
| controller.jumpTo(listItemHeight + 10); |
| await tester.pumpAndSettle(); |
| |
| await tester.fling(find.text('Page0-Item1'), const Offset(-100.0, 0.0), 10000.0); |
| await tester.pumpAndSettle(); |
| |
| expect(find.text('Page0-Item1'), findsNothing); |
| expect(find.text('Page1-Item1'), findsOneWidget); |
| expect(find.text('Page2-Item0'), findsNothing); |
| expect(find.text('Page2-Item1'), findsNothing); |
| |
| await tester.fling(find.text('Page1-Item1'), const Offset(-100.0, 0.0), 10000.0); |
| await tester.pumpAndSettle(); |
| |
| expect(find.text('Page0-Item1'), findsNothing); |
| expect(find.text('Page1-Item1'), findsNothing); |
| expect(find.text('Page2-Item0'), findsNothing); |
| expect(find.text('Page2-Item1'), findsOneWidget); |
| |
| await tester.pumpWidget(const Text('Another page', textDirection: TextDirection.ltr)); |
| |
| expect(controller.initialScrollOffset, 0.0); |
| }); |
| } |