| // 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/scheduler.dart'; |
| import 'package:flutter/widgets.dart'; |
| import 'package:flutter_test/flutter_test.dart'; |
| |
| void main() { |
| testWidgets('Nested TickerMode cannot turn tickers back on', (WidgetTester tester) async { |
| int outerTickCount = 0; |
| int innerTickCount = 0; |
| |
| Widget nestedTickerModes({bool innerEnabled, bool outerEnabled}) { |
| return Directionality( |
| textDirection: TextDirection.rtl, |
| child: TickerMode( |
| enabled: outerEnabled, |
| child: Row( |
| children: <Widget>[ |
| _TickingWidget( |
| onTick: () { |
| outerTickCount++; |
| }, |
| ), |
| TickerMode( |
| enabled: innerEnabled, |
| child: _TickingWidget( |
| onTick: () { |
| innerTickCount++; |
| }, |
| ), |
| ), |
| ], |
| ), |
| ), |
| ); |
| } |
| |
| await tester.pumpWidget( |
| nestedTickerModes( |
| outerEnabled: false, |
| innerEnabled: true, |
| ), |
| ); |
| |
| expect(outerTickCount, 0); |
| expect(innerTickCount, 0); |
| await tester.pump(const Duration(seconds: 1)); |
| await tester.pump(const Duration(seconds: 1)); |
| await tester.pump(const Duration(seconds: 1)); |
| await tester.pump(const Duration(seconds: 1)); |
| expect(outerTickCount, 0); |
| expect(innerTickCount, 0); |
| |
| await tester.pumpWidget( |
| nestedTickerModes( |
| outerEnabled: true, |
| innerEnabled: false, |
| ), |
| ); |
| outerTickCount = 0; |
| innerTickCount = 0; |
| await tester.pump(const Duration(seconds: 1)); |
| await tester.pump(const Duration(seconds: 1)); |
| await tester.pump(const Duration(seconds: 1)); |
| await tester.pump(const Duration(seconds: 1)); |
| expect(outerTickCount, 4); |
| expect(innerTickCount, 0); |
| |
| await tester.pumpWidget( |
| nestedTickerModes( |
| outerEnabled: true, |
| innerEnabled: true, |
| ), |
| ); |
| outerTickCount = 0; |
| innerTickCount = 0; |
| await tester.pump(const Duration(seconds: 1)); |
| await tester.pump(const Duration(seconds: 1)); |
| await tester.pump(const Duration(seconds: 1)); |
| await tester.pump(const Duration(seconds: 1)); |
| expect(outerTickCount, 4); |
| expect(innerTickCount, 4); |
| |
| await tester.pumpWidget( |
| nestedTickerModes( |
| outerEnabled: false, |
| innerEnabled: false, |
| ), |
| ); |
| outerTickCount = 0; |
| innerTickCount = 0; |
| await tester.pump(const Duration(seconds: 1)); |
| await tester.pump(const Duration(seconds: 1)); |
| await tester.pump(const Duration(seconds: 1)); |
| await tester.pump(const Duration(seconds: 1)); |
| expect(outerTickCount, 0); |
| expect(innerTickCount, 0); |
| }); |
| } |
| |
| class _TickingWidget extends StatefulWidget { |
| const _TickingWidget({this.onTick}); |
| |
| final VoidCallback onTick; |
| |
| @override |
| State<_TickingWidget> createState() => _TickingWidgetState(); |
| } |
| |
| class _TickingWidgetState extends State<_TickingWidget> with SingleTickerProviderStateMixin { |
| Ticker _ticker; |
| |
| @override |
| void initState() { |
| super.initState(); |
| _ticker = createTicker((Duration _) { |
| widget.onTick(); |
| })..start(); |
| } |
| |
| @override |
| Widget build(BuildContext context) { |
| return Container(); |
| } |
| |
| @override |
| void dispose() { |
| _ticker.dispose(); |
| super.dispose(); |
| } |
| } |