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Unverified Commit 5f2d730f authored by Kate Lovett's avatar Kate Lovett Committed by GitHub
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Revert Ballistic & Clamping simulation updates (#111201)

parent dc6ab626
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Showing with 58 additions and 448 deletions
dev/tools/generate_android_spline_data.dart deleted 100644 → 0
View file @ dc6ab626
// 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.
const int _nbSamples = 100;
final List<double> _splinePosition = List<double>.filled(_nbSamples + 1, 0.0);
final List<double> _splineTime = List<double>.filled(_nbSamples + 1, 0.0);
const double _startTension = 0.5;
const double _endTension = 1.0;
const double _inflexion = 0.35;
// Generate the spline data used in ClampingScrollSimulation.
//
// This logic is a translation of the 2-dimensional logic found in
// https://android.googlesource.com/platform/frameworks/base/+/master/core/java/android/widget/Scroller.java.
//
// The output of this program should be copied over to [_splinePosition] in
// flutter/packages/flutter/lib/src/widgets/scroll_simulation.dart.
void main() {
const double p1 = _startTension * _inflexion;
const double p2 = 1.0 - _endTension * (1.0 - _inflexion);
double xMin = 0.0;
double yMin = 0.0;
for (int i = 0; i < _nbSamples; i++) {
final double alpha = i / _nbSamples;
double xMax = 1.0;
double x, tx, coef;
while (true) {
x = xMin + (xMax - xMin) / 2.0;
coef = 3.0 * x * (1.0 - x);
tx = coef * ((1.0 - x) * p1 + x * p2) + x * x * x;
if ((tx - alpha).abs() < 1e-5) {
break;
}
if (tx > alpha) {
xMax = x;
} else {
xMin = x;
}
}
_splinePosition[i] = coef * ((1.0 - x) * _startTension + x) + x * x * x;
double yMax = 1.0;
double y, dy;
while (true) {
y = yMin + (yMax - yMin) / 2.0;
coef = 3.0 * y * (1.0 - y);
dy = coef * ((1.0 - y) * _startTension + y) + y * y * y;
if ((dy - alpha).abs() < 1e-5) {
break;
}
if (dy > alpha) {
yMax = y;
} else {
yMin = y;
}
}
_splineTime[i] = coef * ((1.0 - y) * p1 + y * p2) + y * y * y;
}
_splinePosition[_nbSamples] = _splineTime[_nbSamples] = 1.0;
print(_splinePosition);
}
packages/flutter/lib/src/animation/animation_controller.dart
View file @ 5f2d730f
......@@ -757,15 +757,6 @@ class AnimationController extends Animation<double>
return result;
}
/// Update the simulation without restarting the animation.
///
/// The current simulation will be replaced with the provided [Simulation].
/// It is only valid to call this when an animation is currently underway.
void updateSimulation(Simulation simulation) {
assert(isAnimating);
_simulation = simulation;
}
/// Stops running this animation.
///
/// This does not trigger any notifications. The animation stops in its
......
packages/flutter/lib/src/widgets/nested_scroll_view.dart
View file @ 5f2d730f
......@@ -686,12 +686,6 @@ class _NestedScrollCoordinator implements ScrollActivityDelegate, ScrollHoldCont
);
}
// TODO(Piinks): https://github.com/flutter/flutter/issues/100748
@override
Simulation? updateBallisticAnimation(double initVelocity, double initPosition) {
return null;
}
ScrollActivity createOuterBallisticScrollActivity(double velocity) {
// This function creates a ballistic scroll for the outer scrollable.
//
......@@ -1367,12 +1361,6 @@ class _NestedScrollPosition extends ScrollPosition implements ScrollActivityDele
));
}
// TODO(Piinks): see https://github.com/flutter/flutter/issues/100748
@override
Simulation? updateBallisticAnimation(double initVelocity, double initPosition) {
return null;
}
ScrollActivity createBallisticScrollActivity(
Simulation? simulation, {
required _NestedBallisticScrollActivityMode mode,
......
packages/flutter/lib/src/widgets/scroll_activity.dart
View file @ 5f2d730f
......@@ -47,16 +47,6 @@ abstract class ScrollActivityDelegate {
/// Terminate the current activity and start a ballistic activity with the
/// given velocity.
void goBallistic(double velocity);
/// Update the ballistic animation instead of restarting it, for example as
/// the result of a layout change after a flinging gesture.
///
/// The [initVelocity] and [initPosition] refer to the starting values of the
/// new ballistic animation.
///
/// Can return null if the current [ScrollPhysics.createBallisticSimulation]
/// returns null, which will trigger an [IdleScrollActivity] instead.
Simulation? updateBallisticAnimation(double initVelocity, double initPosition);
}
/// Base class for scrolling activities like dragging and flinging.
......@@ -534,17 +524,13 @@ class DragScrollActivity extends ScrollActivity {
class BallisticScrollActivity extends ScrollActivity {
/// Creates an activity that animates a scroll view based on a [simulation].
///
/// The [delegate], [simulation], and [vsync] arguments must not be null. The
/// [initVelocity] and [initPosition] arguments allow the ballistic activity
/// to update the simulation instead of restarting it.
/// The [delegate], [simulation], and [vsync] arguments must not be null.
BallisticScrollActivity(
super.delegate,
Simulation simulation,
TickerProvider vsync,
this.shouldIgnorePointer, {
double initVelocity = 0.0,
double initPosition = 0.0,
}) : _initVelocity = initVelocity, _initPosition = initPosition {
this.shouldIgnorePointer,
) {
_controller = AnimationController.unbounded(
debugLabel: kDebugMode ? objectRuntimeType(this, 'BallisticScrollActivity') : null,
vsync: vsync,
......@@ -556,10 +542,6 @@ class BallisticScrollActivity extends ScrollActivity {
late AnimationController _controller;
final double _initVelocity;
final double _initPosition;
@override
void resetActivity() {
delegate.goBallistic(velocity);
......@@ -567,13 +549,7 @@ class BallisticScrollActivity extends ScrollActivity {
@override
void applyNewDimensions() {
final Simulation? newSimulation = delegate.updateBallisticAnimation(
_initVelocity,
_initPosition,
);
if (newSimulation != null) {
_controller.updateSimulation(newSimulation);
}
delegate.goBallistic(velocity);
}
void _tick() {
......
packages/flutter/lib/src/widgets/scroll_position_with_single_context.dart
View file @ 5f2d730f
......@@ -12,7 +12,6 @@ import 'basic.dart';
import 'framework.dart';
import 'scroll_activity.dart';
import 'scroll_context.dart';
import 'scroll_metrics.dart';
import 'scroll_notification.dart';
import 'scroll_physics.dart';
import 'scroll_position.dart';
......@@ -147,35 +146,12 @@ class ScrollPositionWithSingleContext extends ScrollPosition implements ScrollAc
simulation,
context.vsync,
activity?.shouldIgnorePointer ?? true,
initVelocity: velocity,
initPosition: pixels,
));
} else {
goIdle();
}
}
@override
Simulation? updateBallisticAnimation(double initVelocity, double initPosition) {
assert(hasPixels);
final FixedScrollMetrics initScrollMetrics = FixedScrollMetrics(
minScrollExtent: minScrollExtent,
maxScrollExtent: maxScrollExtent,
pixels: initPosition,
viewportDimension: viewportDimension,
axisDirection: axisDirection,
);
final Simulation? simulation = physics.createBallisticSimulation(
initScrollMetrics,
initVelocity,
);
if (simulation == null) {
goIdle();
return null;
}
return simulation;
}
@override
ScrollDirection get userScrollDirection => _userScrollDirection;
ScrollDirection _userScrollDirection = ScrollDirection.idle;
......
packages/flutter/lib/src/widgets/scroll_simulation.dart
View file @ 5f2d730f
......@@ -146,13 +146,11 @@ class ClampingScrollSimulation extends Simulation {
required this.velocity,
this.friction = 0.015,
super.tolerance,
}) {
_duration = _splineFlingDuration(velocity);
_distance = _splineFlingDistance(velocity);
}) : assert(_flingVelocityPenetration(0.0) == _initialVelocityPenetration) {
_duration = _flingDuration(velocity);
_distance = (velocity * _duration / _initialVelocityPenetration).abs();
}
final double _inflexion = 0.35;
/// The position of the particle at the beginning of the simulation.
final double position;
......@@ -165,7 +163,7 @@ class ClampingScrollSimulation extends Simulation {
/// The more friction the particle experiences, the sooner it stops.
final double friction;
late int _duration;
late double _duration;
late double _distance;
// See DECELERATION_RATE.
......@@ -173,186 +171,59 @@ class ClampingScrollSimulation extends Simulation {
// See computeDeceleration().
static double _decelerationForFriction(double friction) {
return 9.80665 *
39.37 *
friction *
1.0 * // Flutter operates on logical pixels so the DPI should be 1.0.
160.0;
return friction * 61774.04968;
}
// See getSplineDeceleration().
double _splineDeceleration(double velocity) {
return math.log(_inflexion *
velocity.abs() /
(friction * _decelerationForFriction(0.84)));
// See getSplineFlingDuration(). Returns a value in seconds.
double _flingDuration(double velocity) {
// See mPhysicalCoeff
final double scaledFriction = friction * _decelerationForFriction(0.84);
// See getSplineDeceleration().
final double deceleration = math.log(0.35 * velocity.abs() / scaledFriction);
return math.exp(deceleration / (_kDecelerationRate - 1.0));
}
// See getSplineFlingDuration().
int _splineFlingDuration(double velocity) {
final double deceleration = _splineDeceleration(velocity);
return (1000 * math.exp(deceleration / (_kDecelerationRate - 1.0))).round();
// Based on a cubic curve fit to the Scroller.computeScrollOffset() values
// produced for an initial velocity of 4000. The value of Scroller.getDuration()
// and Scroller.getFinalY() were 686ms and 961 pixels respectively.
//
// Algebra courtesy of Wolfram Alpha.
//
// f(x) = scrollOffset, x is time in milliseconds
// f(x) = 3.60882×10^-6 x^3 - 0.00668009 x^2 + 4.29427 x - 3.15307
// f(x) = 3.60882×10^-6 x^3 - 0.00668009 x^2 + 4.29427 x, so f(0) is 0
// f(686ms) = 961 pixels
// Scale to f(0 <= t <= 1.0), x = t * 686
// f(t) = 1165.03 t^3 - 3143.62 t^2 + 2945.87 t
// Scale f(t) so that 0.0 <= f(t) <= 1.0
// f(t) = (1165.03 t^3 - 3143.62 t^2 + 2945.87 t) / 961.0
// = 1.2 t^3 - 3.27 t^2 + 3.065 t
static const double _initialVelocityPenetration = 3.065;
static double _flingDistancePenetration(double t) {
return (1.2 * t * t * t) - (3.27 * t * t) + (_initialVelocityPenetration * t);
}
// See getSplineFlingDistance().
double _splineFlingDistance(double velocity) {
final double l = _splineDeceleration(velocity);
final double decelMinusOne = _kDecelerationRate - 1.0;
return friction *
_decelerationForFriction(0.84) *
math.exp(_kDecelerationRate / decelMinusOne * l);
// The derivative of the _flingDistancePenetration() function.
static double _flingVelocityPenetration(double t) {
return (3.6 * t * t) - (6.54 * t) + _initialVelocityPenetration;
}
@override
double x(double time) {
if (time == 0) {
return position;
}
final _NBSample sample = _NBSample(time, _duration);
return position + (sample.distanceCoef * _distance) * velocity.sign;
final double t = clampDouble(time / _duration, 0.0, 1.0);
return position + _distance * _flingDistancePenetration(t) * velocity.sign;
}
@override
double dx(double time) {
if (time == 0) {
return velocity;
}
final _NBSample sample = _NBSample(time, _duration);
return sample.velocityCoef * _distance / _duration * velocity.sign * 1000.0;
final double t = clampDouble(time / _duration, 0.0, 1.0);
return _distance * _flingVelocityPenetration(t) * velocity.sign / _duration;
}
@override
bool isDone(double time) {
return time * 1000.0 >= _duration;
return time >= _duration;
}
}
class _NBSample {
_NBSample(double time, int duration) {
// See computeScrollOffset().
final double t = time * 1000.0 / duration;
final int index = (_nbSamples * t).clamp(0, _nbSamples).round(); // ignore_clamp_double_lint
_distanceCoef = 1.0;
_velocityCoef = 0.0;
if (index < _nbSamples) {
final double tInf = index / _nbSamples;
final double tSup = (index + 1) / _nbSamples;
final double dInf = _splinePosition[index];
final double dSup = _splinePosition[index + 1];
_velocityCoef = (dSup - dInf) / (tSup - tInf);
_distanceCoef = dInf + (t - tInf) * _velocityCoef;
}
}
late double _velocityCoef;
double get velocityCoef => _velocityCoef;
late double _distanceCoef;
double get distanceCoef => _distanceCoef;
static const int _nbSamples = 100;
// Generated from dev/tools/generate_android_spline_data.dart.
static const List<double> _splinePosition = <double>[
0.000022888183591973643,
0.028561000304762274,
0.05705195792956655,
0.08538917797618413,
0.11349556286812107,
0.14129881694635613,
0.16877157254923383,
0.19581093511175632,
0.22239649722992452,
0.24843841866631658,
0.2740024733220569,
0.298967680744136,
0.32333234658228116,
0.34709556909569184,
0.3702249257894571,
0.39272483400399893,
0.41456988647721615,
0.43582889025419114,
0.4564192786416,
0.476410299013587,
0.4957560715637827,
0.5145493169954743,
0.5327205670880077,
0.5502846891191615,
0.5673274324802855,
0.583810881323224,
0.5997478744397482,
0.615194045299478,
0.6301165005270208,
0.6445484042257972,
0.6585198219185201,
0.6720397744233084,
0.6850997688076114,
0.6977281404741683,
0.7099506591298411,
0.7217749311525871,
0.7331784038850426,
0.7442308394229518,
0.7549087205105974,
0.7652471277371271,
0.7752251637549381,
0.7848768260203478,
0.7942056937103814,
0.8032299679689082,
0.8119428702388629,
0.8203713516576219,
0.8285187880808974,
0.8363794492831295,
0.8439768562813565,
0.851322799855549,
0.8584111051351724,
0.8652534074722162,
0.8718525580962131,
0.8782333271742155,
0.8843892099362031,
0.8903155590440985,
0.8960465359221951,
0.9015574505919048,
0.9068736766459904,
0.9119951682409297,
0.9169321898723632,
0.9216747065581234,
0.9262420604674766,
0.9306331858366086,
0.9348476990715433,
0.9389007110754832,
0.9427903495057521,
0.9465220679845756,
0.9500943036519721,
0.9535176728088761,
0.9567898524767604,
0.959924306623116,
0.9629127700159108,
0.9657622101750765,
0.9684818726275105,
0.9710676079044347,
0.9735231939498,
0.9758514437576309,
0.9780599066560445,
0.9801485715370128,
0.9821149805689633,
0.9839677526782791,
0.9857085499421516,
0.9873347811966005,
0.9888547171706613,
0.9902689443512227,
0.9915771042095881,
0.9927840651641069,
0.9938913963715834,
0.9948987305580712,
0.9958114963810524,
0.9966274782266875,
0.997352148697352,
0.9979848677523623,
0.9985285021374979,
0.9989844084453229,
0.9993537595844986,
0.999638729860106,
0.9998403888004533,
0.9999602810470701,
1.0
];
}
packages/flutter/test/widgets/scroll_activity_test.dart
View file @ 5f2d730f
......@@ -129,64 +129,6 @@ void main() {
expect(find.text('Page 9'), findsOneWidget);
});
List<Widget> childrenSizeIncrease(int n) {
return List<Widget>.generate(n, (int i) {
return SizedBox(height: 40.0 + i * 3, child: Text('$i'));
});
}
testWidgets('Check for duplicate pixels with ClampingScrollPhysics', (WidgetTester tester) async {
final List<double> scrollSimulationXList = <double>[];
final TestScrollPhysics testScrollPhysics = TestScrollPhysics(
scrollSimulationXList,
parent: const ClampingScrollPhysics(),
);
await tester.pumpWidget(
MaterialApp(
home: ListView(
physics: testScrollPhysics,
children: childrenSizeIncrease(100),
),
),
);
await tester.fling(find.byType(ListView), const Offset(0.0, -4000.0), 4000.0);
await tester.pumpAndSettle();
final Set<double> checkSet = <double>{};
checkSet.addAll(scrollSimulationXList);
/// checkSet.length + 1 is because:
/// simulation.x(0.0) will be called in _startSimulation.
/// The first frame of the animation will also call simulation.x(0.0).
/// It can be tolerated that it has at most one duplicate value.
final bool hasOnlyOneDuplicate = scrollSimulationXList.length == checkSet.length + 1;
expect(true, hasOnlyOneDuplicate); // and ends up at the end
});
testWidgets('Check for duplicate pixels with BouncingScrollPhysics', (WidgetTester tester) async {
final List<double> scrollSimulationXList = <double>[];
final TestScrollPhysics testScrollPhysics = TestScrollPhysics(
scrollSimulationXList,
parent: const BouncingScrollPhysics(),
);
await tester.pumpWidget(
MaterialApp(
home: ListView(
physics: testScrollPhysics,
children: childrenSizeIncrease(100),
),
),
);
await tester.fling(find.byType(ListView), const Offset(0.0, -4000.0), 4000.0);
await tester.pumpAndSettle();
final Set<double> checkSet = <double>{};
checkSet.addAll(scrollSimulationXList);
/// checkSet.length + 1 is because:
/// simulation.x(0.0) will be call in _startSimulation.
/// The first frame of the animation will also call simulation.x(0.0).
/// It can be tolerated that it has at most one duplicate value.
final bool noDuplicate = scrollSimulationXList.length == checkSet.length + 1;
expect(true, noDuplicate); // and ends up at the end
});
testWidgets('Pointer is not ignored during trackpad scrolling.', (WidgetTester tester) async {
final ScrollController controller = ScrollController();
int? lastTapped;
......@@ -268,62 +210,6 @@ void main() {
});
}
class TestScrollPhysics extends ScrollPhysics {
const TestScrollPhysics(this.scrollSimulationXList, { super.parent });
final List<double> scrollSimulationXList;
@override
Simulation? createBallisticSimulation(
ScrollMetrics position,
double velocity,
) {
final Simulation? scrollSimulation = super.createBallisticSimulation(
position,
velocity,
);
if (scrollSimulation != null && scrollSimulationXList != null) {
return TestScrollScrollSimulation(
scrollSimulation,
scrollSimulationXList,
);
}
return scrollSimulation;
}
@override
TestScrollPhysics applyTo(ScrollPhysics? ancestor) {
return TestScrollPhysics(
scrollSimulationXList,
parent: buildParent(ancestor),
);
}
}
class TestScrollScrollSimulation extends Simulation {
TestScrollScrollSimulation(this.innerScrollSimulation,
this.scrollSimulationXList,);
final Simulation innerScrollSimulation;
final List<double> scrollSimulationXList;
@override
double dx(double time) => innerScrollSimulation.dx(time);
@override
bool isDone(double time) => innerScrollSimulation.isDone(time);
@override
double x(double time) {
final double simulationX = innerScrollSimulation.x(time);
if (scrollSimulationXList != null) {
scrollSimulationXList.add(simulationX);
}
return simulationX;
}
}
class PageView62209 extends StatefulWidget {
const PageView62209({super.key});
......
packages/flutter/test/widgets/scroll_simulation_test.dart
View file @ 5f2d730f
......@@ -23,21 +23,4 @@ void main() {
checkInitialConditions(75.0, 614.2093);
checkInitialConditions(5469.0, 182.114534);
});
test('ClampingScrollSimulation velocity eventually reaches zero', () {
void checkFinalConditions(double position, double velocity) {
final ClampingScrollSimulation simulation = ClampingScrollSimulation(position: position, velocity: velocity);
expect(simulation.dx(10.0), equals(0.0));
}
checkFinalConditions(51.0, 2000.0);
checkFinalConditions(584.0, 2617.294734);
checkFinalConditions(345.0, 1982.785934);
checkFinalConditions(0.0, 1831.366634);
checkFinalConditions(-156.2, 1541.57665);
checkFinalConditions(4.0, 1139.250439);
checkFinalConditions(4534.0, 1073.553798);
checkFinalConditions(75.0, 614.2093);
checkFinalConditions(5469.0, 182.114534);
});
}
packages/flutter/test/widgets/scrollable_fling_test.dart
View file @ 5f2d730f
......@@ -48,7 +48,7 @@ void main() {
// Before changing these values, ensure the fling results in a distance that
// makes sense. See issue for more context.
expect(androidResult, greaterThan(394.0));
expect(androidResult, lessThan(408.2));
expect(androidResult, lessThan(395.0));
await pumpTest(tester, TargetPlatform.linux);
await tester.fling(find.byType(ListView), const Offset(0.0, -dragOffset), 1000.0);
......@@ -152,6 +152,6 @@ void main() {
expect(log, equals(<String>['tap 21']));
await tester.tap(find.byType(Scrollable));
await tester.pump(const Duration(milliseconds: 50));
expect(log, equals(<String>['tap 21', 'tap 49']));
expect(log, equals(<String>['tap 21', 'tap 48']));
});
}
packages/flutter/test/widgets/scrollable_semantics_test.dart
View file @ 5f2d730f
......@@ -231,7 +231,7 @@ void main() {
expect(semantics, includesNodeWith(
scrollExtentMin: 0.0,
scrollPosition: 394.3,
scrollPosition: 380.2,
scrollExtentMax: 520.0,
actions: <SemanticsAction>[
SemanticsAction.scrollUp,
......@@ -280,7 +280,7 @@ void main() {
expect(semantics, includesNodeWith(
scrollExtentMin: 0.0,
scrollPosition: 394.3,
scrollPosition: 380.2,
scrollExtentMax: double.infinity,
actions: <SemanticsAction>[
SemanticsAction.scrollUp,
......@@ -292,7 +292,7 @@ void main() {
expect(semantics, includesNodeWith(
scrollExtentMin: 0.0,
scrollPosition: 788.6,
scrollPosition: 760.4,
scrollExtentMax: double.infinity,
actions: <SemanticsAction>[
SemanticsAction.scrollUp,
......
packages/flutter/test/widgets/scrollable_test.dart
View file @ 5f2d730f
......@@ -946,8 +946,8 @@ void main() {
expect(find.byKey(const ValueKey<String>('Box 0')), findsNothing);
expect(find.byKey(const ValueKey<String>('Box 52')), findsOneWidget);
expect(expensiveWidgets, 40);
expect(cheapWidgets, 21);
expect(expensiveWidgets, 38);
expect(cheapWidgets, 20);
});
testWidgets('Can recommendDeferredLoadingForContext - override heuristic', (WidgetTester tester) async {
......@@ -989,9 +989,9 @@ void main() {
expect(find.byKey(const ValueKey<String>('Box 0')), findsNothing);
expect(find.byKey(const ValueKey<String>('Cheap box 52')), findsOneWidget);
expect(expensiveWidgets, 17);
expect(cheapWidgets, 44);
expect(physics.count, 44 + 17);
expect(expensiveWidgets, 18);
expect(cheapWidgets, 40);
expect(physics.count, 40 + 18);
});
testWidgets('Can recommendDeferredLoadingForContext - override heuristic and always return true', (WidgetTester tester) async {
......@@ -1032,7 +1032,7 @@ void main() {
expect(find.byKey(const ValueKey<String>('Cheap box 52')), findsOneWidget);
expect(expensiveWidgets, 0);
expect(cheapWidgets, 61);
expect(cheapWidgets, 58);
});
testWidgets('ensureVisible does not move PageViews', (WidgetTester tester) async {
......@@ -1439,9 +1439,9 @@ void main() {
await tester.sendEventToBinding(testPointer.hover(tester.getCenter(find.byType(Scrollable))));
await tester.sendEventToBinding(testPointer.scrollInertiaCancel()); // Cancel partway through.
await tester.pump();
expect(getScrollOffset(tester), closeTo(342.5439, 0.0001));
expect(getScrollOffset(tester), closeTo(333.2944, 0.0001));
await tester.pump(const Duration(milliseconds: 4800));
expect(getScrollOffset(tester), closeTo(342.5439, 0.0001));
expect(getScrollOffset(tester), closeTo(333.2944, 0.0001));
});
}
......
packages/flutter/test/widgets/slivers_appbar_floating_pinned_test.dart
View file @ 5f2d730f
......@@ -151,7 +151,7 @@ void main() {
);
expect(semantics, hasSemantics(expectedSemantics, ignoreTransform: true, ignoreId: true, ignoreRect: true));
await tester.fling(find.text('Tile 2'), const Offset(0, -600), 1950);
await tester.fling(find.text('Tile 2'), const Offset(0, -600), 2000);
await tester.pumpAndSettle();
expectedSemantics = TestSemantics.root(
......
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