73 lines
2.5 KiB
Dart
73 lines
2.5 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/rendering.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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void main() {
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testWidgets('Render and element tree stay in sync when keyed children move around', (WidgetTester tester) async {
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// Regression test for https://github.com/flutter/flutter/issues/48855.
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await tester.pumpWidget(
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Directionality(
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textDirection: TextDirection.ltr,
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child: Column(
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children: const <Widget>[
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Text('0', key: ValueKey<int>(0)),
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Text('1', key: ValueKey<int>(1)),
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Text('2', key: ValueKey<int>(2)),
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Text('3', key: ValueKey<int>(3)),
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Text('4', key: ValueKey<int>(4)),
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Text('5', key: ValueKey<int>(5)),
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Text('6', key: ValueKey<int>(6)),
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Text('7', key: ValueKey<int>(7)),
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Text('8', key: ValueKey<int>(8)),
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],
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),
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),
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);
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expect(
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_getChildOrder(tester.renderObject<RenderFlex>(find.byType(Column))),
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<String>['0', '1', '2', '3', '4', '5', '6', '7', '8'],
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);
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await tester.pumpWidget(
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Directionality(
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textDirection: TextDirection.ltr,
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child: Column(
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children: const <Widget>[
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Text('0', key: ValueKey<int>(0)),
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Text('6', key: ValueKey<int>(6)),
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Text('7', key: ValueKey<int>(7)),
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Text('8', key: ValueKey<int>(8)),
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Text('1', key: ValueKey<int>(1)),
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Text('2', key: ValueKey<int>(2)),
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Text('3', key: ValueKey<int>(3)),
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Text('4', key: ValueKey<int>(4)),
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Text('5', key: ValueKey<int>(5)),
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],
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),
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),
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);
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expect(
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_getChildOrder(tester.renderObject<RenderFlex>(find.byType(Column))),
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<String>['0', '6', '7', '8', '1', '2', '3', '4', '5'],
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);
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});
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}
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// Do not use tester.renderObjectList(find.byType(RenderParagraph). That returns
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// the RenderObjects in the order of their associated RenderObjectWidgets. The
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// point of this test is to assert the children order in the render tree, though.
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List<String> _getChildOrder(RenderFlex flex) {
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final List<String> childOrder = <String>[];
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flex.visitChildren((RenderObject child) {
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childOrder.add(((child as RenderParagraph).text as TextSpan).text);
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});
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return childOrder;
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}
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