46 lines
1.3 KiB
Dart
46 lines
1.3 KiB
Dart
// 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/widgets.dart';
|
|
import 'package:flutter_test/flutter_test.dart';
|
|
|
|
void main() {
|
|
testWidgets('relayout boundary change does not trigger relayout', (WidgetTester tester) async {
|
|
final renderLayoutCount = RenderLayoutCount();
|
|
final Widget layoutCounter = Center(
|
|
key: GlobalKey(),
|
|
child: WidgetToRenderBoxAdapter(renderBox: renderLayoutCount),
|
|
);
|
|
|
|
await tester.pumpWidget(
|
|
Center(
|
|
child: SizedBox(
|
|
width: 100,
|
|
height: 100,
|
|
child: Center(
|
|
child: SizedBox(width: 100, height: 100, child: Center(child: layoutCounter)),
|
|
),
|
|
),
|
|
),
|
|
);
|
|
|
|
expect(renderLayoutCount.layoutCount, 1);
|
|
|
|
await tester.pumpWidget(Center(child: SizedBox(width: 100, height: 100, child: layoutCounter)));
|
|
|
|
expect(renderLayoutCount.layoutCount, 1);
|
|
});
|
|
}
|
|
|
|
// This class is needed because LayoutBuilder's RenderObject does not always
|
|
// call the builder method in its PerformLayout method.
|
|
class RenderLayoutCount extends RenderBox {
|
|
int layoutCount = 0;
|
|
|
|
@override
|
|
void performLayout() {
|
|
layoutCount += 1;
|
|
size = constraints.biggest;
|
|
}
|
|
}
|