| // 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_test/flutter_test.dart'; |
| import 'package:flutter/widgets.dart'; |
| |
| const List<int> items = <int>[0, 1, 2, 3, 4, 5]; |
| |
| Widget buildFrame() { |
| return Directionality( |
| textDirection: TextDirection.ltr, |
| child: ListView( |
| itemExtent: 290.0, |
| scrollDirection: Axis.vertical, |
| children: items.map<Widget>((int item) { |
| return Container( |
| child: Text('$item'), |
| ); |
| }).toList(), |
| ), |
| ); |
| } |
| |
| void main() { |
| testWidgets('Drag vertically', (WidgetTester tester) async { |
| await tester.pumpWidget(buildFrame()); |
| |
| await tester.pump(); |
| await tester.drag(find.text('1'), const Offset(0.0, -300.0)); |
| await tester.pump(); |
| // screen is 600px high, and has the following items: |
| // -10..280 = 1 |
| // 280..570 = 2 |
| // 570..860 = 3 |
| expect(find.text('0'), findsNothing); |
| expect(find.text('1'), findsOneWidget); |
| expect(find.text('2'), findsOneWidget); |
| expect(find.text('3'), findsOneWidget); |
| expect(find.text('4'), findsNothing); |
| expect(find.text('5'), findsNothing); |
| |
| await tester.pump(); |
| await tester.drag(find.text('2'), const Offset(0.0, -290.0)); |
| await tester.pump(); |
| // screen is 600px high, and has the following items: |
| // -10..280 = 2 |
| // 280..570 = 3 |
| // 570..860 = 4 |
| expect(find.text('0'), findsNothing); |
| expect(find.text('1'), findsNothing); |
| expect(find.text('2'), findsOneWidget); |
| expect(find.text('3'), findsOneWidget); |
| expect(find.text('4'), findsOneWidget); |
| expect(find.text('5'), findsNothing); |
| |
| await tester.pump(); |
| await tester.drag(find.text('3'), const Offset(-300.0, 0.0)); |
| await tester.pump(); |
| // nothing should have changed |
| expect(find.text('0'), findsNothing); |
| expect(find.text('1'), findsNothing); |
| expect(find.text('2'), findsOneWidget); |
| expect(find.text('3'), findsOneWidget); |
| expect(find.text('4'), findsOneWidget); |
| expect(find.text('5'), findsNothing); |
| }); |
| |
| testWidgets('Drag vertically', (WidgetTester tester) async { |
| await tester.pumpWidget( |
| Directionality( |
| textDirection: TextDirection.ltr, |
| child: ListView( |
| itemExtent: 290.0, |
| padding: const EdgeInsets.only(top: 250.0), |
| scrollDirection: Axis.vertical, |
| children: items.map<Widget>((int item) { |
| return Container( |
| child: Text('$item'), |
| ); |
| }).toList(), |
| ), |
| ), |
| ); |
| |
| await tester.pump(); |
| // screen is 600px high, and has the following items: |
| // 250..540 = 0 |
| // 540..830 = 1 |
| expect(find.text('0'), findsOneWidget); |
| expect(find.text('1'), findsOneWidget); |
| expect(find.text('2'), findsNothing); |
| expect(find.text('3'), findsNothing); |
| expect(find.text('4'), findsNothing); |
| expect(find.text('5'), findsNothing); |
| |
| await tester.drag(find.text('0'), const Offset(0.0, -300.0)); |
| await tester.pump(); |
| // screen is 600px high, and has the following items: |
| // -50..240 = 0 |
| // 240..530 = 1 |
| // 530..820 = 2 |
| expect(find.text('0'), findsOneWidget); |
| expect(find.text('1'), findsOneWidget); |
| expect(find.text('2'), findsOneWidget); |
| expect(find.text('3'), findsNothing); |
| expect(find.text('4'), findsNothing); |
| expect(find.text('5'), findsNothing); |
| }); |
| } |