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120 changes: 120 additions & 0 deletions
120
packages/flutter/test/widgets/binding_deferred_first_frame_test.dart
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// Copyright 2019 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. | ||
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import 'dart:async'; | ||
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import 'package:flutter/rendering.dart'; | ||
import 'package:flutter_test/flutter_test.dart'; | ||
import 'package:flutter/material.dart'; | ||
import 'package:flutter/widgets.dart'; | ||
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const String _actualContent = 'Actual Content'; | ||
const String _loading = 'Loading...'; | ||
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void main() { | ||
testWidgets('deferFirstFrame/allowFirstFrame stops sending frames to engine', (WidgetTester tester) async { | ||
expect(RendererBinding.instance.sendFramesToEngine, isTrue); | ||
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final Completer<void> completer = Completer<void>(); | ||
await tester.pumpWidget( | ||
Directionality( | ||
textDirection: TextDirection.ltr, | ||
child: _DeferringWidget( | ||
key: UniqueKey(), | ||
loader: completer.future, | ||
), | ||
), | ||
); | ||
final _DeferringWidgetState state = tester.state<_DeferringWidgetState>(find.byType(_DeferringWidget)); | ||
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expect(find.text(_loading), findsOneWidget); | ||
expect(find.text(_actualContent), findsNothing); | ||
expect(RendererBinding.instance.sendFramesToEngine, isFalse); | ||
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await tester.pump(); | ||
expect(find.text(_loading), findsOneWidget); | ||
expect(find.text(_actualContent), findsNothing); | ||
expect(RendererBinding.instance.sendFramesToEngine, isFalse); | ||
expect(state.doneLoading, isFalse); | ||
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// Complete the future to start sending frames. | ||
completer.complete(); | ||
await tester.idle(); | ||
expect(state.doneLoading, isTrue); | ||
expect(RendererBinding.instance.sendFramesToEngine, isTrue); | ||
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await tester.pump(); | ||
expect(find.text(_loading), findsNothing); | ||
expect(find.text(_actualContent), findsOneWidget); | ||
expect(RendererBinding.instance.sendFramesToEngine, isTrue); | ||
}); | ||
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testWidgets('Two widgets can defer frames', (WidgetTester tester) async { | ||
expect(RendererBinding.instance.sendFramesToEngine, isTrue); | ||
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final Completer<void> completer1 = Completer<void>(); | ||
final Completer<void> completer2 = Completer<void>(); | ||
await tester.pumpWidget( | ||
Directionality( | ||
textDirection: TextDirection.ltr, | ||
child: Row( | ||
children: <Widget>[ | ||
_DeferringWidget( | ||
key: UniqueKey(), | ||
loader: completer1.future, | ||
), | ||
_DeferringWidget( | ||
key: UniqueKey(), | ||
loader: completer2.future, | ||
), | ||
], | ||
), | ||
), | ||
); | ||
expect(find.text(_loading), findsNWidgets(2)); | ||
expect(find.text(_actualContent), findsNothing); | ||
expect(RendererBinding.instance.sendFramesToEngine, isFalse); | ||
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completer1.complete(); | ||
completer2.complete(); | ||
await tester.idle(); | ||
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await tester.pump(); | ||
expect(find.text(_loading), findsNothing); | ||
expect(find.text(_actualContent), findsNWidgets(2)); | ||
expect(RendererBinding.instance.sendFramesToEngine, isTrue); | ||
}); | ||
} | ||
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class _DeferringWidget extends StatefulWidget { | ||
const _DeferringWidget({Key key, this.loader}) : super(key: key); | ||
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final Future<void> loader; | ||
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@override | ||
State<_DeferringWidget> createState() => _DeferringWidgetState(); | ||
} | ||
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class _DeferringWidgetState extends State<_DeferringWidget> { | ||
bool doneLoading = false; | ||
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@override | ||
void initState() { | ||
super.initState(); | ||
RendererBinding.instance.deferFirstFrame(); | ||
widget.loader.then((_) { | ||
setState(() { | ||
doneLoading = true; | ||
RendererBinding.instance.allowFirstFrame(); | ||
}); | ||
}); | ||
} | ||
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@override | ||
Widget build(BuildContext context) { | ||
return doneLoading | ||
? const Text(_actualContent) | ||
: const Text(_loading); | ||
} | ||
} |
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