| // Copyright 2017 The Chromium 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'; |
| |
| void main() { |
| testWidgets('ListView.builder() fixed itemExtent, scroll to end, append, scroll', (WidgetTester tester) async { |
| // Regression test for https://github.com/flutter/flutter/issues/9506 |
| |
| Widget buildFrame(int itemCount) { |
| return new Directionality( |
| textDirection: TextDirection.ltr, |
| child: new ListView.builder( |
| itemExtent: 200.0, |
| itemCount: itemCount, |
| itemBuilder: (BuildContext context, int index) => new Text('item $index'), |
| ), |
| ); |
| } |
| |
| await tester.pumpWidget(buildFrame(3)); |
| expect(find.text('item 0'), findsOneWidget); |
| expect(find.text('item 1'), findsOneWidget); |
| expect(find.text('item 2'), findsOneWidget); |
| |
| await tester.pumpWidget(buildFrame(4)); |
| expect(find.text('item 3'), findsNothing); |
| final TestGesture gesture = await tester.startGesture(const Offset(0.0, 300.0)); |
| await gesture.moveBy(const Offset(0.0, -200.0)); |
| await tester.pumpAndSettle(); |
| expect(find.text('item 3'), findsOneWidget); |
| }); |
| |
| testWidgets('ListView.builder() fixed itemExtent, scroll to end, append, scroll', (WidgetTester tester) async { |
| // Regression test for https://github.com/flutter/flutter/issues/9506 |
| |
| Widget buildFrame(int itemCount) { |
| return new Directionality( |
| textDirection: TextDirection.ltr, |
| child: new ListView.builder( |
| itemCount: itemCount, |
| itemBuilder: (BuildContext context, int index) { |
| return new SizedBox( |
| height: 200.0, |
| child: new Text('item $index'), |
| ); |
| }, |
| ), |
| ); |
| } |
| |
| await tester.pumpWidget(buildFrame(3)); |
| expect(find.text('item 0'), findsOneWidget); |
| expect(find.text('item 1'), findsOneWidget); |
| expect(find.text('item 2'), findsOneWidget); |
| |
| await tester.pumpWidget(buildFrame(4)); |
| final TestGesture gesture = await tester.startGesture(const Offset(0.0, 300.0)); |
| await gesture.moveBy(const Offset(0.0, -200.0)); |
| await tester.pumpAndSettle(); |
| expect(find.text('item 3'), findsOneWidget); |
| }); |
| } |