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https://github.com/flutter/flutter
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78 lines
1.8 KiB
Dart
78 lines
1.8 KiB
Dart
// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:flutter/scheduler.dart';
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import 'package:flutter/widgets.dart';
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import 'package:flutter_test/flutter_test.dart';
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import 'common.dart';
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void main() {
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WidgetsFlutterBinding.ensureInitialized();
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initTimelineTests();
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test('Widgets with updated keys produce well formed timelines', () async {
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await runFrame(() { runApp(const TestRoot()); });
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await SchedulerBinding.instance.endOfFrame;
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debugProfileBuildsEnabled = true;
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await runFrame(() {
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TestRoot.state.updateKey();
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});
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int buildCount = 0;
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for (final TimelineEvent event in await fetchTimelineEvents()) {
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if (event.json!['name'] == 'BUILD') {
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final String ph = event.json!['ph'] as String;
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if (ph == 'B') {
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buildCount++;
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} else if (ph == 'E') {
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buildCount--;
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}
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}
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}
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expect(buildCount, 0);
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debugProfileBuildsEnabled = false;
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}, skip: isBrowser); // [intended] uses dart:isolate and io.
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}
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class TestRoot extends StatefulWidget {
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const TestRoot({super.key});
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static late TestRootState state;
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@override
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State<TestRoot> createState() => TestRootState();
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}
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class TestRootState extends State<TestRoot> {
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final Key _globalKey = GlobalKey();
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Key _localKey = UniqueKey();
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@override
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void initState() {
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super.initState();
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TestRoot.state = this;
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}
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void updateKey() {
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setState(() {
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_localKey = UniqueKey();
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});
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}
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@override
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Widget build(BuildContext context) {
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return Center(
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key: _localKey,
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child: SizedBox(
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key: _globalKey,
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width: 100,
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height: 100,
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),
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);
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}
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}
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