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212 lines
10 KiB
Dart
212 lines
10 KiB
Dart
// Copyright 2017 The Chromium 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_test/flutter_test.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter/rendering.dart';
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Future<Null> pumpTest(WidgetTester tester, TargetPlatform platform) async {
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await tester.pumpWidget(new MaterialApp(
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theme: new ThemeData(
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platform: platform,
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),
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home: new CustomScrollView(
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slivers: const <Widget>[
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const SliverToBoxAdapter(child: const SizedBox(height: 2000.0)),
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],
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),
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));
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await tester.pump(const Duration(seconds: 5)); // to let the theme animate
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return null;
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}
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const double dragOffset = 200.0;
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double getScrollOffset(WidgetTester tester) {
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final RenderViewport viewport = tester.renderObject(find.byType(Viewport));
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return viewport.offset.pixels;
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}
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double getScrollVelocity(WidgetTester tester) {
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final RenderViewport viewport = tester.renderObject(find.byType(Viewport));
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final ScrollPosition position = viewport.offset;
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// Access for test only.
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return position.activity.velocity; // ignore: INVALID_USE_OF_PROTECTED_MEMBER
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}
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void resetScrollOffset(WidgetTester tester) {
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final RenderViewport viewport = tester.renderObject(find.byType(Viewport));
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final ScrollPosition position = viewport.offset;
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position.jumpTo(0.0);
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}
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void main() {
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testWidgets('Flings on different platforms', (WidgetTester tester) async {
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await pumpTest(tester, TargetPlatform.android);
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await tester.fling(find.byType(Viewport), const Offset(0.0, -dragOffset), 1000.0);
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expect(getScrollOffset(tester), dragOffset);
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await tester.pump(); // trigger fling
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expect(getScrollOffset(tester), dragOffset);
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await tester.pump(const Duration(seconds: 5));
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final double result1 = getScrollOffset(tester);
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resetScrollOffset(tester);
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await pumpTest(tester, TargetPlatform.iOS);
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await tester.fling(find.byType(Viewport), const Offset(0.0, -dragOffset), 1000.0);
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expect(getScrollOffset(tester), dragOffset);
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await tester.pump(); // trigger fling
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expect(getScrollOffset(tester), dragOffset);
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await tester.pump(const Duration(seconds: 5));
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final double result2 = getScrollOffset(tester);
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expect(result1, lessThan(result2)); // iOS (result2) is slipperier than Android (result1)
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});
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testWidgets('Holding scroll', (WidgetTester tester) async {
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await pumpTest(tester, TargetPlatform.iOS);
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await tester.drag(find.byType(Viewport), const Offset(0.0, 200.0));
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expect(getScrollOffset(tester), -200.0);
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await tester.pump(); // trigger ballistic
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await tester.pump(const Duration(milliseconds: 10));
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expect(getScrollOffset(tester), greaterThan(-200.0));
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expect(getScrollOffset(tester), lessThan(0.0));
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final double position = getScrollOffset(tester);
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final TestGesture gesture = await tester.startGesture(tester.getCenter(find.byType(Viewport)));
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expect(await tester.pumpAndSettle(), 1);
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expect(getScrollOffset(tester), position);
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await gesture.up();
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expect(await tester.pumpAndSettle(const Duration(minutes: 1)), 2);
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expect(getScrollOffset(tester), 0.0);
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});
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testWidgets('Repeated flings builds momentum on iOS', (WidgetTester tester) async {
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await pumpTest(tester, TargetPlatform.iOS);
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await tester.fling(find.byType(Viewport), const Offset(0.0, -dragOffset), 1000.0);
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await tester.pump(); // trigger fling
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await tester.pump(const Duration(milliseconds: 10));
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// Repeat the exact same motion.
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await tester.fling(find.byType(Viewport), const Offset(0.0, -dragOffset), 1000.0);
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await tester.pump();
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// On iOS, the velocity will be larger than the velocity of the last fling by a
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// non-trivial amount.
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expect(getScrollVelocity(tester), greaterThan(1100.0));
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resetScrollOffset(tester);
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await pumpTest(tester, TargetPlatform.android);
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await tester.fling(find.byType(Viewport), const Offset(0.0, -dragOffset), 1000.0);
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await tester.pump(); // trigger fling
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await tester.pump(const Duration(milliseconds: 10));
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// Repeat the exact same motion.
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await tester.fling(find.byType(Viewport), const Offset(0.0, -dragOffset), 1000.0);
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await tester.pump();
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// On Android, there is no momentum build. The final velocity is the same as the
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// velocity of the last fling.
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expect(getScrollVelocity(tester), moreOrLessEquals(1000.0));
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});
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testWidgets('No iOS momentum build with flings in opposite directions', (WidgetTester tester) async {
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await pumpTest(tester, TargetPlatform.iOS);
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await tester.fling(find.byType(Viewport), const Offset(0.0, -dragOffset), 1000.0);
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await tester.pump(); // trigger fling
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await tester.pump(const Duration(milliseconds: 10));
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// Repeat the exact same motion in the opposite direction.
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await tester.fling(find.byType(Viewport), const Offset(0.0, dragOffset), 1000.0);
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await tester.pump();
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// The only applied velocity to the scrollable is the second fling that was in the
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// opposite direction.
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expect(getScrollVelocity(tester), greaterThan(-1000.0));
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expect(getScrollVelocity(tester), lessThan(0.0));
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});
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testWidgets('No iOS momentum kept on hold gestures', (WidgetTester tester) async {
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await pumpTest(tester, TargetPlatform.iOS);
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await tester.fling(find.byType(Viewport), const Offset(0.0, -dragOffset), 1000.0);
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await tester.pump(); // trigger fling
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await tester.pump(const Duration(milliseconds: 10));
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expect(getScrollVelocity(tester), greaterThan(0.0));
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final TestGesture gesture = await tester.startGesture(tester.getCenter(find.byType(Viewport)));
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await tester.pump(const Duration(milliseconds: 40));
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await gesture.up();
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// After a hold longer than 2 frames, previous velocity is lost.
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expect(getScrollVelocity(tester), 0.0);
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});
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testWidgets('Drags creeping unaffected on Android', (WidgetTester tester) async {
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await pumpTest(tester, TargetPlatform.android);
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final TestGesture gesture = await tester.startGesture(tester.getCenter(find.byType(Viewport)));
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await gesture.moveBy(const Offset(0.0, -0.5));
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expect(getScrollOffset(tester), 0.5);
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await gesture.moveBy(const Offset(0.0, -0.5), timeStamp: const Duration(milliseconds: 10));
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expect(getScrollOffset(tester), 1.0);
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await gesture.moveBy(const Offset(0.0, -0.5), timeStamp: const Duration(milliseconds: 20));
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expect(getScrollOffset(tester), 1.5);
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});
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testWidgets('Drags creeping must break threshold on iOS', (WidgetTester tester) async {
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await pumpTest(tester, TargetPlatform.iOS);
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final TestGesture gesture = await tester.startGesture(tester.getCenter(find.byType(Viewport)));
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await gesture.moveBy(const Offset(0.0, -0.5));
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expect(getScrollOffset(tester), 0.0);
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await gesture.moveBy(const Offset(0.0, -0.5), timeStamp: const Duration(milliseconds: 10));
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expect(getScrollOffset(tester), 0.0);
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await gesture.moveBy(const Offset(0.0, -0.5), timeStamp: const Duration(milliseconds: 20));
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expect(getScrollOffset(tester), 0.0);
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await gesture.moveBy(const Offset(0.0, -1.0), timeStamp: const Duration(milliseconds: 30));
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// Now -2.5 in total.
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expect(getScrollOffset(tester), 0.0);
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await gesture.moveBy(const Offset(0.0, -1.0), timeStamp: const Duration(milliseconds: 40));
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// Now -3.5, just reached threshold.
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expect(getScrollOffset(tester), 0.0);
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await gesture.moveBy(const Offset(0.0, -0.5), timeStamp: const Duration(milliseconds: 50));
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// -0.5 over threshold transferred.
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expect(getScrollOffset(tester), 0.5);
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});
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testWidgets('Big drag over threshold magnitude preserved on iOS', (WidgetTester tester) async {
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await pumpTest(tester, TargetPlatform.iOS);
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final TestGesture gesture = await tester.startGesture(tester.getCenter(find.byType(Viewport)));
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await gesture.moveBy(const Offset(0.0, -20.0));
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// No offset lost from threshold.
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expect(getScrollOffset(tester), 20.0);
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});
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testWidgets('Small continuing motion preserved on iOS', (WidgetTester tester) async {
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await pumpTest(tester, TargetPlatform.iOS);
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final TestGesture gesture = await tester.startGesture(tester.getCenter(find.byType(Viewport)));
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await gesture.moveBy(const Offset(0.0, -20.0)); // Break threshold.
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expect(getScrollOffset(tester), 20.0);
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await gesture.moveBy(const Offset(0.0, -0.5), timeStamp: const Duration(milliseconds: 20));
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expect(getScrollOffset(tester), 20.5);
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await gesture.moveBy(const Offset(0.0, -0.5), timeStamp: const Duration(milliseconds: 40));
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expect(getScrollOffset(tester), 21.0);
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await gesture.moveBy(const Offset(0.0, -0.5), timeStamp: const Duration(milliseconds: 60));
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expect(getScrollOffset(tester), 21.5);
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});
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testWidgets('Motion stop resets threshold on iOS', (WidgetTester tester) async {
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await pumpTest(tester, TargetPlatform.iOS);
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final TestGesture gesture = await tester.startGesture(tester.getCenter(find.byType(Viewport)));
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await gesture.moveBy(const Offset(0.0, -20.0)); // Break threshold.
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expect(getScrollOffset(tester), 20.0);
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await gesture.moveBy(const Offset(0.0, -0.5), timeStamp: const Duration(milliseconds: 20));
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expect(getScrollOffset(tester), 20.5);
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await gesture.moveBy(Offset.zero);
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// Stationary too long, threshold reset.
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await gesture.moveBy(Offset.zero, timeStamp: const Duration(milliseconds: 120));
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await gesture.moveBy(const Offset(0.0, -1.0), timeStamp: const Duration(milliseconds: 140));
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expect(getScrollOffset(tester), 20.5);
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await gesture.moveBy(const Offset(0.0, -1.0), timeStamp: const Duration(milliseconds: 150));
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expect(getScrollOffset(tester), 20.5);
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await gesture.moveBy(const Offset(0.0, -1.0), timeStamp: const Duration(milliseconds: 160));
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expect(getScrollOffset(tester), 20.5);
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await gesture.moveBy(const Offset(0.0, -1.0), timeStamp: const Duration(milliseconds: 170));
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// New threshold broken.
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expect(getScrollOffset(tester), 21.5);
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await gesture.moveBy(const Offset(0.0, -1.0), timeStamp: const Duration(milliseconds: 180));
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expect(getScrollOffset(tester), 22.5);
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});
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}
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