// Copyright 2015 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/material.dart'; import 'package:flutter/gestures.dart' show DragStartBehavior; const TextStyle testFont = TextStyle( color: Color(0xFF00FF00), fontFamily: 'Ahem', ); Future<void> pumpTest(WidgetTester tester, TargetPlatform platform) async { await tester.pumpWidget(Container()); await tester.pumpWidget(MaterialApp( theme: ThemeData( platform: platform, ), home: Container( color: const Color(0xFF111111), child: ListView.builder( dragStartBehavior: DragStartBehavior.down, itemBuilder: (BuildContext context, int index) { return Text('$index', style: testFont); }, ), ), )); } const double dragOffset = 213.82; void main() { testWidgets('Flings on different platforms', (WidgetTester tester) async { double getCurrentOffset() { return tester.state<ScrollableState>(find.byType(Scrollable)).position.pixels; } await pumpTest(tester, TargetPlatform.android); await tester.fling(find.byType(ListView), const Offset(0.0, -dragOffset), 1000.0); expect(getCurrentOffset(), dragOffset); await tester.pump(); // trigger fling expect(getCurrentOffset(), dragOffset); await tester.pump(const Duration(seconds: 5)); final double result1 = getCurrentOffset(); await pumpTest(tester, TargetPlatform.iOS); await tester.fling(find.byType(ListView), const Offset(0.0, -dragOffset), 1000.0); // Scroll starts ease into the scroll on iOS. expect(getCurrentOffset(), moreOrLessEquals(210.71026666666666)); await tester.pump(); // trigger fling expect(getCurrentOffset(), moreOrLessEquals(210.71026666666666)); await tester.pump(const Duration(seconds: 5)); final double result2 = getCurrentOffset(); expect(result1, lessThan(result2)); // iOS (result2) is slipperier than Android (result1) }); testWidgets('fling and tap to stop', (WidgetTester tester) async { final List<String> log = <String>[]; await tester.pumpWidget( Directionality( textDirection: TextDirection.ltr, child: ListView( dragStartBehavior: DragStartBehavior.down, children: List<Widget>.generate(250, (int i) => GestureDetector( onTap: () { log.add('tap $i'); }, child: Text('$i', style: testFont), )), ), ), ); expect(log, equals(<String>[])); await tester.tap(find.byType(Scrollable)); await tester.pump(const Duration(milliseconds: 50)); expect(log, equals(<String>['tap 21'])); await tester.fling(find.byType(Scrollable), const Offset(0.0, -200.0), 1000.0); await tester.pump(const Duration(milliseconds: 50)); expect(log, equals(<String>['tap 21'])); await tester.tap(find.byType(Scrollable)); // should stop the fling but not tap anything await tester.pump(const Duration(milliseconds: 50)); expect(log, equals(<String>['tap 21'])); await tester.tap(find.byType(Scrollable)); await tester.pump(const Duration(milliseconds: 50)); expect(log, equals(<String>['tap 21', 'tap 35'])); }, skip: isBrowser); testWidgets('fling and wait and tap', (WidgetTester tester) async { final List<String> log = <String>[]; await tester.pumpWidget( Directionality( textDirection: TextDirection.ltr, child: ListView( dragStartBehavior: DragStartBehavior.down, children: List<Widget>.generate(250, (int i) => GestureDetector( onTap: () { log.add('tap $i'); }, child: Text('$i', style: testFont), )), ), ), ); expect(log, equals(<String>[])); await tester.tap(find.byType(Scrollable)); await tester.pump(const Duration(milliseconds: 50)); expect(log, equals(<String>['tap 21'])); await tester.fling(find.byType(Scrollable), const Offset(0.0, -200.0), 1000.0); await tester.pump(const Duration(milliseconds: 50)); expect(log, equals(<String>['tap 21'])); await tester.pump(const Duration(seconds: 50)); // long wait, so the fling will have ended at the end of it expect(log, equals(<String>['tap 21'])); await tester.tap(find.byType(Scrollable)); await tester.pump(const Duration(milliseconds: 50)); expect(log, equals(<String>['tap 21', 'tap 48'])); }, skip: isBrowser); }