blob: e0d0c60f4a99392cfb9ad3875f5c33aa62893468 [file] [log] [blame]
// 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_test/flutter_test.dart';
import 'package:flutter/widgets.dart';
void main() {
testWidgets('repaint boundary with constraint changes', (WidgetTester tester) async {
// Regression test for as https://github.com/flutter/flutter/issues/39151.
await tester.pumpWidget(const RelayoutBoundariesCrash());
tester.state<RelayoutBoundariesCrashState>(find.byType(RelayoutBoundariesCrash))._toggleMode();
await tester.pump();
});
}
class RelayoutBoundariesCrash extends StatefulWidget {
const RelayoutBoundariesCrash({Key key}) : super(key: key);
@override
RelayoutBoundariesCrashState createState() => RelayoutBoundariesCrashState();
}
class RelayoutBoundariesCrashState extends State<RelayoutBoundariesCrash> {
bool _mode = true;
void _toggleMode() {
setState(() {
_mode = !_mode;
});
}
@override
Widget build(BuildContext context) {
return Center(
child: SizedBox(
// when _mode is true, constraints are tight, otherwise constraints are loose
width: !_mode ? 100.0 : null,
height: !_mode ? 100.0 : null,
child: LayoutBuilder(
builder: (BuildContext context, BoxConstraints constraints) {
// Make the outer SizedBoxes relayout without making the Placeholders relayout.
final double dimension = !_mode ? 10.0 : 20.0;
return Column(
children: <Widget>[
SizedBox(
width: dimension,
height: dimension,
child: const Placeholder(),
),
SizedBox(
width: dimension,
height: dimension,
child: const Placeholder(),
),
],
);
},
),
),
);
}
}