flutter_flutter/packages/flutter/test/widgets/scroll_behavior_test.dart
Ian Hickson 449f4a6673
License update (#45373)
* Update project.pbxproj files to say Flutter rather than Chromium

Also, the templates now have an empty organization so that we don't cause people to give their apps a Flutter copyright.

* Update the copyright notice checker to require a standard notice on all files

* Update copyrights on Dart files. (This was a mechanical commit.)

* Fix weird license headers on Dart files that deviate from our conventions; relicense Shrine.

Some were already marked "The Flutter Authors", not clear why. Their
dates have been normalized. Some were missing the blank line after the
license. Some were randomly different in trivial ways for no apparent
reason (e.g. missing the trailing period).

* Clean up the copyrights in non-Dart files. (Manual edits.)

Also, make sure templates don't have copyrights.

* Fix some more ORGANIZATIONNAMEs
2019-11-27 15:04:02 -08:00

72 lines
2.1 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';
class TestScrollBehavior extends ScrollBehavior {
const TestScrollBehavior(this.flag);
final bool flag;
@override
ScrollPhysics getScrollPhysics(BuildContext context) {
return flag
? const ClampingScrollPhysics()
: const BouncingScrollPhysics();
}
@override
bool shouldNotify(TestScrollBehavior old) => flag != old.flag;
}
void main() {
testWidgets('Inherited ScrollConfiguration changed', (WidgetTester tester) async {
final GlobalKey key = GlobalKey(debugLabel: 'scrollable');
TestScrollBehavior behavior;
ScrollPositionWithSingleContext position;
final Widget scrollView = SingleChildScrollView(
key: key,
child: Builder(
builder: (BuildContext context) {
behavior = ScrollConfiguration.of(context);
position = Scrollable.of(context).position;
return Container(height: 1000.0);
},
),
);
await tester.pumpWidget(
ScrollConfiguration(
behavior: const TestScrollBehavior(true),
child: scrollView,
),
);
expect(behavior, isNotNull);
expect(behavior.flag, isTrue);
expect(position.physics, isInstanceOf<ClampingScrollPhysics>());
ScrollMetrics metrics = position.copyWith();
expect(metrics.extentAfter, equals(400.0));
expect(metrics.viewportDimension, equals(600.0));
// Same Scrollable, different ScrollConfiguration
await tester.pumpWidget(
ScrollConfiguration(
behavior: const TestScrollBehavior(false),
child: scrollView,
),
);
expect(behavior, isNotNull);
expect(behavior.flag, isFalse);
expect(position.physics, isInstanceOf<BouncingScrollPhysics>());
// Regression test for https://github.com/flutter/flutter/issues/5856
metrics = position.copyWith();
expect(metrics.extentAfter, equals(400.0));
expect(metrics.viewportDimension, equals(600.0));
});
}