blob: 316f672f41d91d4861c48b88bf23d287f1316ea4 [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 'dart:ui' as ui;
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/scheduler.dart';
import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';
Future<void> pumpTest(
WidgetTester tester,
TargetPlatform? platform, {
bool scrollable = true,
bool reverse = false,
ScrollController? controller,
}) async {
await tester.pumpWidget(MaterialApp(
theme: ThemeData(
platform: platform,
),
home: CustomScrollView(
controller: controller,
reverse: reverse,
physics: scrollable ? null : const NeverScrollableScrollPhysics(),
slivers: const <Widget>[
SliverToBoxAdapter(child: SizedBox(height: 2000.0)),
],
),
));
await tester.pump(const Duration(seconds: 5)); // to let the theme animate
}
// Pump a nested scrollable. The outer scrollable contains a sliver of a
// 300-pixel-long scrollable followed by a 2000-pixel-long content.
Future<void> pumpDoubleScrollableTest(
WidgetTester tester,
TargetPlatform platform,
) async {
await tester.pumpWidget(MaterialApp(
theme: ThemeData(
platform: platform,
),
home: CustomScrollView(
slivers: <Widget>[
SliverToBoxAdapter(
child: Container(
height: 300,
child: const CustomScrollView(
slivers: <Widget>[
SliverToBoxAdapter(child: SizedBox(height: 2000.0)),
],
),
),
),
const SliverToBoxAdapter(child: SizedBox(height: 2000.0)),
],
),
));
await tester.pump(const Duration(seconds: 5)); // to let the theme animate
}
const double dragOffset = 200.0;
final LogicalKeyboardKey modifierKey = defaultTargetPlatform == TargetPlatform.macOS
? LogicalKeyboardKey.metaLeft
: LogicalKeyboardKey.controlLeft;
double getScrollOffset(WidgetTester tester, {bool last = true}) {
Finder viewportFinder = find.byType(Viewport);
if (last)
viewportFinder = viewportFinder.last;
final RenderViewport viewport = tester.renderObject(viewportFinder);
return viewport.offset.pixels;
}
double getScrollVelocity(WidgetTester tester) {
final RenderViewport viewport = tester.renderObject(find.byType(Viewport));
final ScrollPosition position = viewport.offset as ScrollPosition;
return position.activity!.velocity;
}
void resetScrollOffset(WidgetTester tester) {
final RenderViewport viewport = tester.renderObject(find.byType(Viewport));
final ScrollPosition position = viewport.offset as ScrollPosition;
position.jumpTo(0.0);
}
void main() {
testWidgets('Flings on different platforms', (WidgetTester tester) async {
await pumpTest(tester, TargetPlatform.android);
await tester.fling(find.byType(Scrollable), const Offset(0.0, -dragOffset), 1000.0);
expect(getScrollOffset(tester), dragOffset);
await tester.pump(); // trigger fling
expect(getScrollOffset(tester), dragOffset);
await tester.pump(const Duration(seconds: 5));
final double androidResult = getScrollOffset(tester);
resetScrollOffset(tester);
await pumpTest(tester, TargetPlatform.iOS);
await tester.fling(find.byType(Scrollable), const Offset(0.0, -dragOffset), 1000.0);
// Scroll starts ease into the scroll on iOS.
expect(getScrollOffset(tester), moreOrLessEquals(197.16666666666669));
await tester.pump(); // trigger fling
expect(getScrollOffset(tester), moreOrLessEquals(197.16666666666669));
await tester.pump(const Duration(seconds: 5));
final double iOSResult = getScrollOffset(tester);
resetScrollOffset(tester);
await pumpTest(tester, TargetPlatform.macOS);
await tester.fling(find.byType(Scrollable), const Offset(0.0, -dragOffset), 1000.0);
// Scroll starts ease into the scroll on iOS.
expect(getScrollOffset(tester), moreOrLessEquals(197.16666666666669));
await tester.pump(); // trigger fling
expect(getScrollOffset(tester), moreOrLessEquals(197.16666666666669));
await tester.pump(const Duration(seconds: 5));
final double macOSResult = getScrollOffset(tester);
expect(androidResult, lessThan(iOSResult)); // iOS is slipperier than Android
expect(androidResult, lessThan(macOSResult)); // macOS is slipperier than Android
});
testWidgets('Holding scroll', (WidgetTester tester) async {
await pumpTest(tester, debugDefaultTargetPlatformOverride);
await tester.drag(find.byType(Scrollable), const Offset(0.0, 200.0), touchSlopY: 0.0);
expect(getScrollOffset(tester), -200.0);
await tester.pump(); // trigger ballistic
await tester.pump(const Duration(milliseconds: 10));
expect(getScrollOffset(tester), greaterThan(-200.0));
expect(getScrollOffset(tester), lessThan(0.0));
final double heldPosition = getScrollOffset(tester);
// Hold and let go while in overscroll.
final TestGesture gesture = await tester.startGesture(tester.getCenter(find.byType(Scrollable), warnIfMissed: true));
expect(await tester.pumpAndSettle(), 1);
expect(getScrollOffset(tester), heldPosition);
await gesture.up();
// Once the hold is let go, it should still snap back to origin.
expect(await tester.pumpAndSettle(const Duration(minutes: 1)), 2);
expect(getScrollOffset(tester), 0.0);
}, variant: const TargetPlatformVariant(<TargetPlatform>{ TargetPlatform.iOS, TargetPlatform.macOS }));
testWidgets('Repeated flings builds momentum', (WidgetTester tester) async {
await pumpTest(tester, debugDefaultTargetPlatformOverride);
await tester.fling(find.byType(Scrollable), const Offset(0.0, -dragOffset), 1000.0);
await tester.pump(); // trigger fling
await tester.pump(const Duration(milliseconds: 10));
// Repeat the exact same motion.
await tester.fling(find.byType(Scrollable), const Offset(0.0, -dragOffset), 1000.0);
await tester.pump();
// On iOS, the velocity will be larger than the velocity of the last fling by a
// non-trivial amount.
expect(getScrollVelocity(tester), greaterThan(1100.0));
}, variant: const TargetPlatformVariant(<TargetPlatform>{ TargetPlatform.iOS, TargetPlatform.macOS }));
testWidgets('Repeated flings do not build momentum on Android', (WidgetTester tester) async {
await pumpTest(tester, TargetPlatform.android);
await tester.fling(find.byType(Scrollable), const Offset(0.0, -dragOffset), 1000.0);
await tester.pump(); // trigger fling
await tester.pump(const Duration(milliseconds: 10));
// Repeat the exact same motion.
await tester.fling(find.byType(Scrollable), const Offset(0.0, -dragOffset), 1000.0);
await tester.pump();
// On Android, there is no momentum build. The final velocity is the same as the
// velocity of the last fling.
expect(getScrollVelocity(tester), moreOrLessEquals(1000.0));
});
testWidgets('No iOS/macOS momentum build with flings in opposite directions', (WidgetTester tester) async {
await pumpTest(tester, debugDefaultTargetPlatformOverride);
await tester.fling(find.byType(Scrollable), const Offset(0.0, -dragOffset), 1000.0);
await tester.pump(); // trigger fling
await tester.pump(const Duration(milliseconds: 10));
// Repeat the exact same motion in the opposite direction.
await tester.fling(find.byType(Scrollable), const Offset(0.0, dragOffset), 1000.0);
await tester.pump();
// The only applied velocity to the scrollable is the second fling that was in the
// opposite direction.
expect(getScrollVelocity(tester), -1000.0);
}, variant: const TargetPlatformVariant(<TargetPlatform>{ TargetPlatform.iOS, TargetPlatform.macOS }));
testWidgets('No iOS/macOS momentum kept on hold gestures', (WidgetTester tester) async {
await pumpTest(tester, debugDefaultTargetPlatformOverride);
await tester.fling(find.byType(Scrollable), const Offset(0.0, -dragOffset), 1000.0);
await tester.pump(); // trigger fling
await tester.pump(const Duration(milliseconds: 10));
expect(getScrollVelocity(tester), greaterThan(0.0));
final TestGesture gesture = await tester.startGesture(tester.getCenter(find.byType(Scrollable), warnIfMissed: true));
await tester.pump(const Duration(milliseconds: 40));
await gesture.up();
// After a hold longer than 2 frames, previous velocity is lost.
expect(getScrollVelocity(tester), 0.0);
}, variant: const TargetPlatformVariant(<TargetPlatform>{ TargetPlatform.iOS, TargetPlatform.macOS }));
testWidgets('Drags creeping unaffected on Android', (WidgetTester tester) async {
await pumpTest(tester, TargetPlatform.android);
final TestGesture gesture = await tester.startGesture(tester.getCenter(find.byType(Scrollable), warnIfMissed: true));
await gesture.moveBy(const Offset(0.0, -0.5));
expect(getScrollOffset(tester), 0.5);
await gesture.moveBy(const Offset(0.0, -0.5), timeStamp: const Duration(milliseconds: 10));
expect(getScrollOffset(tester), 1.0);
await gesture.moveBy(const Offset(0.0, -0.5), timeStamp: const Duration(milliseconds: 20));
expect(getScrollOffset(tester), 1.5);
});
testWidgets('Drags creeping must break threshold on iOS/macOS', (WidgetTester tester) async {
await pumpTest(tester, debugDefaultTargetPlatformOverride);
final TestGesture gesture = await tester.startGesture(tester.getCenter(find.byType(Scrollable), warnIfMissed: true));
await gesture.moveBy(const Offset(0.0, -0.5));
expect(getScrollOffset(tester), 0.0);
await gesture.moveBy(const Offset(0.0, -0.5), timeStamp: const Duration(milliseconds: 10));
expect(getScrollOffset(tester), 0.0);
await gesture.moveBy(const Offset(0.0, -0.5), timeStamp: const Duration(milliseconds: 20));
expect(getScrollOffset(tester), 0.0);
await gesture.moveBy(const Offset(0.0, -1.0), timeStamp: const Duration(milliseconds: 30));
// Now -2.5 in total.
expect(getScrollOffset(tester), 0.0);
await gesture.moveBy(const Offset(0.0, -1.0), timeStamp: const Duration(milliseconds: 40));
// Now -3.5, just reached threshold.
expect(getScrollOffset(tester), 0.0);
await gesture.moveBy(const Offset(0.0, -0.5), timeStamp: const Duration(milliseconds: 50));
// -0.5 over threshold transferred.
expect(getScrollOffset(tester), 0.5);
}, variant: const TargetPlatformVariant(<TargetPlatform>{ TargetPlatform.iOS, TargetPlatform.macOS }));
testWidgets('Big drag over threshold magnitude preserved on iOS/macOS', (WidgetTester tester) async {
await pumpTest(tester, debugDefaultTargetPlatformOverride);
final TestGesture gesture = await tester.startGesture(tester.getCenter(find.byType(Scrollable), warnIfMissed: true));
await gesture.moveBy(const Offset(0.0, -30.0));
// No offset lost from threshold.
expect(getScrollOffset(tester), 30.0);
}, variant: const TargetPlatformVariant(<TargetPlatform>{ TargetPlatform.iOS, TargetPlatform.macOS }));
testWidgets('Slow threshold breaks are attenuated on iOS/macOS', (WidgetTester tester) async {
await pumpTest(tester, debugDefaultTargetPlatformOverride);
final TestGesture gesture = await tester.startGesture(tester.getCenter(find.byType(Scrollable), warnIfMissed: true));
// This is a typical 'hesitant' iOS scroll start.
await gesture.moveBy(const Offset(0.0, -10.0));
expect(getScrollOffset(tester), moreOrLessEquals(1.1666666666666667));
await gesture.moveBy(const Offset(0.0, -10.0), timeStamp: const Duration(milliseconds: 20));
// Subsequent motions unaffected.
expect(getScrollOffset(tester), moreOrLessEquals(11.16666666666666673));
}, variant: const TargetPlatformVariant(<TargetPlatform>{ TargetPlatform.iOS, TargetPlatform.macOS }));
testWidgets('Small continuing motion preserved on iOS/macOS', (WidgetTester tester) async {
await pumpTest(tester, debugDefaultTargetPlatformOverride);
final TestGesture gesture = await tester.startGesture(tester.getCenter(find.byType(Scrollable), warnIfMissed: true));
await gesture.moveBy(const Offset(0.0, -30.0)); // Break threshold.
expect(getScrollOffset(tester), 30.0);
await gesture.moveBy(const Offset(0.0, -0.5), timeStamp: const Duration(milliseconds: 20));
expect(getScrollOffset(tester), 30.5);
await gesture.moveBy(const Offset(0.0, -0.5), timeStamp: const Duration(milliseconds: 40));
expect(getScrollOffset(tester), 31.0);
await gesture.moveBy(const Offset(0.0, -0.5), timeStamp: const Duration(milliseconds: 60));
expect(getScrollOffset(tester), 31.5);
}, variant: const TargetPlatformVariant(<TargetPlatform>{ TargetPlatform.iOS, TargetPlatform.macOS }));
testWidgets('Motion stop resets threshold on iOS/macOS', (WidgetTester tester) async {
await pumpTest(tester, debugDefaultTargetPlatformOverride);
final TestGesture gesture = await tester.startGesture(tester.getCenter(find.byType(Scrollable), warnIfMissed: true));
await gesture.moveBy(const Offset(0.0, -30.0)); // Break threshold.
expect(getScrollOffset(tester), 30.0);
await gesture.moveBy(const Offset(0.0, -0.5), timeStamp: const Duration(milliseconds: 20));
expect(getScrollOffset(tester), 30.5);
await gesture.moveBy(Offset.zero, timeStamp: const Duration(milliseconds: 21));
// Stationary too long, threshold reset.
await gesture.moveBy(Offset.zero, timeStamp: const Duration(milliseconds: 120));
await gesture.moveBy(const Offset(0.0, -1.0), timeStamp: const Duration(milliseconds: 140));
expect(getScrollOffset(tester), 30.5);
await gesture.moveBy(const Offset(0.0, -1.0), timeStamp: const Duration(milliseconds: 150));
expect(getScrollOffset(tester), 30.5);
await gesture.moveBy(const Offset(0.0, -1.0), timeStamp: const Duration(milliseconds: 160));
expect(getScrollOffset(tester), 30.5);
await gesture.moveBy(const Offset(0.0, -1.0), timeStamp: const Duration(milliseconds: 170));
// New threshold broken.
expect(getScrollOffset(tester), 31.5);
await gesture.moveBy(const Offset(0.0, -1.0), timeStamp: const Duration(milliseconds: 180));
expect(getScrollOffset(tester), 32.5);
}, variant: const TargetPlatformVariant(<TargetPlatform>{ TargetPlatform.iOS, TargetPlatform.macOS }));
testWidgets('Scroll pointer signals are handled on Fuchsia', (WidgetTester tester) async {
await pumpTest(tester, TargetPlatform.fuchsia);
final Offset scrollEventLocation = tester.getCenter(find.byType(Viewport));
final TestPointer testPointer = TestPointer(1, ui.PointerDeviceKind.mouse);
// Create a hover event so that |testPointer| has a location when generating the scroll.
testPointer.hover(scrollEventLocation);
await tester.sendEventToBinding(testPointer.scroll(const Offset(0.0, 20.0)));
expect(getScrollOffset(tester), 20.0);
// Pointer signals should not cause overscroll.
await tester.sendEventToBinding(testPointer.scroll(const Offset(0.0, -30.0)));
expect(getScrollOffset(tester), 0.0);
});
testWidgets('Scroll pointer signals are handled when there is competion', (WidgetTester tester) async {
// This is a regression test. When there are multiple scrollables listening
// to the same event, for example when scrollables are nested, there used
// to be exceptions at scrolling events.
await pumpDoubleScrollableTest(tester, TargetPlatform.fuchsia);
final Offset scrollEventLocation = tester.getCenter(find.byType(Viewport).last);
final TestPointer testPointer = TestPointer(1, ui.PointerDeviceKind.mouse);
// Create a hover event so that |testPointer| has a location when generating the scroll.
testPointer.hover(scrollEventLocation);
await tester.sendEventToBinding(testPointer.scroll(const Offset(0.0, 20.0)));
expect(getScrollOffset(tester, last: true), 20.0);
// Pointer signals should not cause overscroll.
await tester.sendEventToBinding(testPointer.scroll(const Offset(0.0, -30.0)));
expect(getScrollOffset(tester, last: true), 0.0);
});
testWidgets('Scroll pointer signals are ignored when scrolling is disabled', (WidgetTester tester) async {
await pumpTest(tester, TargetPlatform.fuchsia, scrollable: false);
final Offset scrollEventLocation = tester.getCenter(find.byType(Viewport));
final TestPointer testPointer = TestPointer(1, ui.PointerDeviceKind.mouse);
// Create a hover event so that |testPointer| has a location when generating the scroll.
testPointer.hover(scrollEventLocation);
await tester.sendEventToBinding(testPointer.scroll(const Offset(0.0, 20.0)));
expect(getScrollOffset(tester), 0.0);
});
testWidgets('Holding scroll and Scroll pointer signal will update ScrollDirection.forward / ScrollDirection.reverse', (WidgetTester tester) async {
ScrollDirection? lastUserScrollingDirection;
final ScrollController controller = ScrollController();
await pumpTest(tester, TargetPlatform.fuchsia, controller: controller);
controller.addListener(() {
if(controller.position.userScrollDirection != ScrollDirection.idle)
lastUserScrollingDirection = controller.position.userScrollDirection;
});
await tester.drag(find.byType(Scrollable), const Offset(0.0, -20.0), touchSlopY: 0.0);
expect(lastUserScrollingDirection, ScrollDirection.reverse);
final Offset scrollEventLocation = tester.getCenter(find.byType(Viewport));
final TestPointer testPointer = TestPointer(1, ui.PointerDeviceKind.mouse);
// Create a hover event so that |testPointer| has a location when generating the scroll.
testPointer.hover(scrollEventLocation);
await tester.sendEventToBinding(testPointer.scroll(const Offset(0.0, 20.0)));
expect(lastUserScrollingDirection, ScrollDirection.reverse);
await tester.drag(find.byType(Scrollable), const Offset(0.0, 20.0), touchSlopY: 0.0);
expect(lastUserScrollingDirection, ScrollDirection.forward);
await tester.sendEventToBinding(testPointer.scroll(const Offset(0.0, -20.0)));
expect(lastUserScrollingDirection, ScrollDirection.forward);
});
testWidgets('Scrolls in correct direction when scroll axis is reversed', (WidgetTester tester) async {
await pumpTest(tester, TargetPlatform.fuchsia, reverse: true);
final Offset scrollEventLocation = tester.getCenter(find.byType(Viewport));
final TestPointer testPointer = TestPointer(1, ui.PointerDeviceKind.mouse);
// Create a hover event so that |testPointer| has a location when generating the scroll.
testPointer.hover(scrollEventLocation);
await tester.sendEventToBinding(testPointer.scroll(const Offset(0.0, -20.0)));
expect(getScrollOffset(tester), 20.0);
});
group('setCanDrag to false with active drag gesture: ', () {
Future<void> pumpTestWidget(WidgetTester tester, { required bool canDrag }) {
return tester.pumpWidget(
MaterialApp(
home: CustomScrollView(
physics: canDrag ? const AlwaysScrollableScrollPhysics() : const NeverScrollableScrollPhysics(),
slivers: <Widget>[SliverToBoxAdapter(
child: SizedBox(
height: 2000,
child: GestureDetector(onTap: () {},),
),
)],
),
),
);
}
testWidgets('Hold does not disable user interaction', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/66816.
await pumpTestWidget(tester, canDrag: true);
final RenderIgnorePointer renderIgnorePointer = tester.renderObject<RenderIgnorePointer>(
find.descendant(of: find.byType(CustomScrollView), matching: find.byType(IgnorePointer)),
);
expect(renderIgnorePointer.ignoring, false);
final TestGesture gesture = await tester.startGesture(tester.getCenter(find.byType(Viewport)));
expect(renderIgnorePointer.ignoring, false);
await pumpTestWidget(tester, canDrag: false);
expect(renderIgnorePointer.ignoring, false);
await gesture.up();
expect(renderIgnorePointer.ignoring, false);
});
testWidgets('Drag disables user interaction when recognized', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/66816.
await pumpTestWidget(tester, canDrag: true);
final RenderIgnorePointer renderIgnorePointer = tester.renderObject<RenderIgnorePointer>(
find.descendant(of: find.byType(CustomScrollView), matching: find.byType(IgnorePointer)),
);
expect(renderIgnorePointer.ignoring, false);
final TestGesture gesture = await tester.startGesture(tester.getCenter(find.byType(Viewport)));
expect(renderIgnorePointer.ignoring, false);
await gesture.moveBy(const Offset(0, -100));
// Starts ignoring when the drag is recognized.
expect(renderIgnorePointer.ignoring, true);
await pumpTestWidget(tester, canDrag: false);
expect(renderIgnorePointer.ignoring, false);
await gesture.up();
expect(renderIgnorePointer.ignoring, false);
});
testWidgets('Ballistic disables user interaction until it stops', (WidgetTester tester) async {
await pumpTestWidget(tester, canDrag: true);
final RenderIgnorePointer renderIgnorePointer = tester.renderObject<RenderIgnorePointer>(
find.descendant(of: find.byType(CustomScrollView), matching: find.byType(IgnorePointer)),
);
expect(renderIgnorePointer.ignoring, false);
// Starts ignoring when the drag is recognized.
await tester.fling(find.byType(Scrollable), const Offset(0, -100), 1000);
expect(renderIgnorePointer.ignoring, true);
await tester.pump();
// When the activity ends we should stop ignoring pointers.
await tester.pumpAndSettle();
expect(renderIgnorePointer.ignoring, false);
});
});
testWidgets("Keyboard scrolling doesn't happen if scroll physics are set to NeverScrollableScrollPhysics", (WidgetTester tester) async {
final ScrollController controller = ScrollController();
await tester.pumpWidget(
MaterialApp(
theme: ThemeData(
platform: TargetPlatform.fuchsia,
),
home: CustomScrollView(
controller: controller,
physics: const NeverScrollableScrollPhysics(),
slivers: List<Widget>.generate(
20,
(int index) {
return SliverToBoxAdapter(
child: Focus(
autofocus: index == 0,
child: SizedBox(key: ValueKey<String>('Box $index'), height: 50.0),
),
);
},
),
),
),
);
await tester.pumpAndSettle();
expect(controller.position.pixels, equals(0.0));
expect(tester.getRect(find.byKey(const ValueKey<String>('Box 0'), skipOffstage: false)), equals(const Rect.fromLTRB(0.0, 0.0, 800.0, 50.0)));
await tester.sendKeyDownEvent(modifierKey);
await tester.sendKeyEvent(LogicalKeyboardKey.arrowDown);
await tester.sendKeyUpEvent(modifierKey);
await tester.pumpAndSettle();
expect(controller.position.pixels, equals(0.0));
expect(tester.getRect(find.byKey(const ValueKey<String>('Box 0'), skipOffstage: false)), equals(const Rect.fromLTRB(0.0, 0.0, 800.0, 50.0)));
await tester.sendKeyDownEvent(modifierKey);
await tester.sendKeyEvent(LogicalKeyboardKey.arrowUp);
await tester.sendKeyUpEvent(modifierKey);
await tester.pumpAndSettle();
expect(controller.position.pixels, equals(0.0));
expect(tester.getRect(find.byKey(const ValueKey<String>('Box 0'), skipOffstage: false)), equals(const Rect.fromLTRB(0.0, 0.0, 800.0, 50.0)));
await tester.sendKeyEvent(LogicalKeyboardKey.pageDown);
await tester.pumpAndSettle();
expect(controller.position.pixels, equals(0.0));
expect(tester.getRect(find.byKey(const ValueKey<String>('Box 0'), skipOffstage: false)), equals(const Rect.fromLTRB(0.0, 0.0, 800.0, 50.0)));
await tester.sendKeyEvent(LogicalKeyboardKey.pageUp);
await tester.pumpAndSettle();
expect(controller.position.pixels, equals(0.0));
expect(tester.getRect(find.byKey(const ValueKey<String>('Box 0'), skipOffstage: false)), equals(const Rect.fromLTRB(0.0, 0.0, 800.0, 50.0)));
});
testWidgets('Vertical scrollables are scrolled when activated via keyboard.', (WidgetTester tester) async {
final ScrollController controller = ScrollController();
await tester.pumpWidget(
MaterialApp(
theme: ThemeData(
platform: TargetPlatform.fuchsia,
),
home: CustomScrollView(
controller: controller,
slivers: List<Widget>.generate(
20,
(int index) {
return SliverToBoxAdapter(
child: Focus(
autofocus: index == 0,
child: SizedBox(key: ValueKey<String>('Box $index'), height: 50.0),
),
);
},
),
),
),
);
await tester.pumpAndSettle();
expect(controller.position.pixels, equals(0.0));
expect(tester.getRect(find.byKey(const ValueKey<String>('Box 0'), skipOffstage: false)), equals(const Rect.fromLTRB(0.0, 0.0, 800.0, 50.0)));
// We exclude the modifier keys here for web testing since default web shortcuts
// do not use a modifier key with arrow keys for ScrollActions.
if (!kIsWeb)
await tester.sendKeyDownEvent(modifierKey);
await tester.sendKeyEvent(LogicalKeyboardKey.arrowDown);
if (!kIsWeb)
await tester.sendKeyUpEvent(modifierKey);
await tester.pumpAndSettle();
expect(tester.getRect(find.byKey(const ValueKey<String>('Box 0'), skipOffstage: false)), equals(const Rect.fromLTRB(0.0, -50.0, 800.0, 0.0)));
if (!kIsWeb)
await tester.sendKeyDownEvent(modifierKey);
await tester.sendKeyEvent(LogicalKeyboardKey.arrowUp);
if (!kIsWeb)
await tester.sendKeyUpEvent(modifierKey);
await tester.pumpAndSettle();
expect(tester.getRect(find.byKey(const ValueKey<String>('Box 0'), skipOffstage: false)), equals(const Rect.fromLTRB(0.0, 0.0, 800.0, 50.0)));
await tester.sendKeyEvent(LogicalKeyboardKey.pageDown);
await tester.pumpAndSettle();
expect(tester.getRect(find.byKey(const ValueKey<String>('Box 0'), skipOffstage: false)), equals(const Rect.fromLTRB(0.0, -400.0, 800.0, -350.0)));
await tester.sendKeyEvent(LogicalKeyboardKey.pageUp);
await tester.pumpAndSettle();
expect(tester.getRect(find.byKey(const ValueKey<String>('Box 0'), skipOffstage: false)), equals(const Rect.fromLTRB(0.0, 0.0, 800.0, 50.0)));
});
testWidgets('Horizontal scrollables are scrolled when activated via keyboard.', (WidgetTester tester) async {
final ScrollController controller = ScrollController();
await tester.pumpWidget(
MaterialApp(
theme: ThemeData(
platform: TargetPlatform.fuchsia,
),
home: CustomScrollView(
controller: controller,
scrollDirection: Axis.horizontal,
slivers: List<Widget>.generate(
20,
(int index) {
return SliverToBoxAdapter(
child: Focus(
autofocus: index == 0,
child: SizedBox(key: ValueKey<String>('Box $index'), width: 50.0),
),
);
},
),
),
),
);
await tester.pumpAndSettle();
expect(controller.position.pixels, equals(0.0));
expect(tester.getRect(find.byKey(const ValueKey<String>('Box 0'), skipOffstage: false)), equals(const Rect.fromLTRB(0.0, 0.0, 50.0, 600.0)));
// We exclude the modifier keys here for web testing since default web shortcuts
// do not use a modifier key with arrow keys for ScrollActions.
if (!kIsWeb)
await tester.sendKeyDownEvent(modifierKey);
await tester.sendKeyEvent(LogicalKeyboardKey.arrowRight);
if (!kIsWeb)
await tester.sendKeyUpEvent(modifierKey);
await tester.pumpAndSettle();
expect(tester.getRect(find.byKey(const ValueKey<String>('Box 0'), skipOffstage: false)), equals(const Rect.fromLTRB(-50.0, 0.0, 0.0, 600.0)));
if (!kIsWeb)
await tester.sendKeyDownEvent(modifierKey);
await tester.sendKeyEvent(LogicalKeyboardKey.arrowLeft);
if (!kIsWeb)
await tester.sendKeyUpEvent(modifierKey);
await tester.pumpAndSettle();
expect(tester.getRect(find.byKey(const ValueKey<String>('Box 0'), skipOffstage: false)), equals(const Rect.fromLTRB(0.0, 0.0, 50.0, 600.0)));
});
testWidgets('Horizontal scrollables are scrolled the correct direction in RTL locales.', (WidgetTester tester) async {
final ScrollController controller = ScrollController();
await tester.pumpWidget(
MaterialApp(
theme: ThemeData(
platform: TargetPlatform.fuchsia,
),
home: Directionality(
textDirection: TextDirection.rtl,
child: CustomScrollView(
controller: controller,
scrollDirection: Axis.horizontal,
slivers: List<Widget>.generate(
20,
(int index) {
return SliverToBoxAdapter(
child: Focus(
autofocus: index == 0,
child: SizedBox(key: ValueKey<String>('Box $index'), width: 50.0),
),
);
},
),
),
),
),
);
await tester.pumpAndSettle();
expect(controller.position.pixels, equals(0.0));
expect(tester.getRect(find.byKey(const ValueKey<String>('Box 0'), skipOffstage: false)), equals(const Rect.fromLTRB(750.0, 0.0, 800.0, 600.0)));
// We exclude the modifier keys here for web testing since default web shortcuts
// do not use a modifier key with arrow keys for ScrollActions.
if (!kIsWeb)
await tester.sendKeyDownEvent(modifierKey);
await tester.sendKeyEvent(LogicalKeyboardKey.arrowLeft);
if (!kIsWeb)
await tester.sendKeyUpEvent(modifierKey);
await tester.pumpAndSettle();
expect(tester.getRect(find.byKey(const ValueKey<String>('Box 0'), skipOffstage: false)), equals(const Rect.fromLTRB(800.0, 0.0, 850.0, 600.0)));
if (!kIsWeb)
await tester.sendKeyDownEvent(modifierKey);
await tester.sendKeyEvent(LogicalKeyboardKey.arrowRight);
if (!kIsWeb)
await tester.sendKeyUpEvent(modifierKey);
await tester.pumpAndSettle();
expect(tester.getRect(find.byKey(const ValueKey<String>('Box 0'), skipOffstage: false)), equals(const Rect.fromLTRB(750.0, 0.0, 800.0, 600.0)));
});
testWidgets('Reversed vertical scrollables are scrolled when activated via keyboard.', (WidgetTester tester) async {
final ScrollController controller = ScrollController();
final FocusNode focusNode = FocusNode(debugLabel: 'SizedBox');
await tester.pumpWidget(
MaterialApp(
theme: ThemeData(
platform: TargetPlatform.fuchsia,
),
home: CustomScrollView(
controller: controller,
reverse: true,
slivers: List<Widget>.generate(
20,
(int index) {
return SliverToBoxAdapter(
child: Focus(
focusNode: focusNode,
child: SizedBox(key: ValueKey<String>('Box $index'), height: 50.0),
),
);
},
),
),
),
);
focusNode.requestFocus();
await tester.pumpAndSettle();
expect(controller.position.pixels, equals(0.0));
expect(tester.getRect(find.byKey(const ValueKey<String>('Box 0'), skipOffstage: false)), equals(const Rect.fromLTRB(0.0, 550.0, 800.0, 600.0)));
// We exclude the modifier keys here for web testing since default web shortcuts
// do not use a modifier key with arrow keys for ScrollActions.
if (!kIsWeb)
await tester.sendKeyDownEvent(modifierKey);
await tester.sendKeyEvent(LogicalKeyboardKey.arrowUp);
if (!kIsWeb)
await tester.sendKeyUpEvent(modifierKey);
await tester.pumpAndSettle();
expect(tester.getRect(find.byKey(const ValueKey<String>('Box 0'), skipOffstage: false)), equals(const Rect.fromLTRB(0.0, 600.0, 800.0, 650.0)));
if (!kIsWeb)
await tester.sendKeyDownEvent(modifierKey);
await tester.sendKeyEvent(LogicalKeyboardKey.arrowDown);
if (!kIsWeb)
await tester.sendKeyUpEvent(modifierKey);
await tester.pumpAndSettle();
expect(tester.getRect(find.byKey(const ValueKey<String>('Box 0'), skipOffstage: false)), equals(const Rect.fromLTRB(0.0, 550.0, 800.0, 600.0)));
await tester.sendKeyEvent(LogicalKeyboardKey.pageUp);
await tester.pumpAndSettle();
expect(tester.getRect(find.byKey(const ValueKey<String>('Box 0'), skipOffstage: false)), equals(const Rect.fromLTRB(0.0, 950.0, 800.0, 1000.0)));
await tester.sendKeyEvent(LogicalKeyboardKey.pageDown);
await tester.pumpAndSettle();
expect(tester.getRect(find.byKey(const ValueKey<String>('Box 0'), skipOffstage: false)), equals(const Rect.fromLTRB(0.0, 550.0, 800.0, 600.0)));
});
testWidgets('Reversed horizontal scrollables are scrolled when activated via keyboard.', (WidgetTester tester) async {
final ScrollController controller = ScrollController();
final FocusNode focusNode = FocusNode(debugLabel: 'SizedBox');
await tester.pumpWidget(
MaterialApp(
theme: ThemeData(
platform: TargetPlatform.fuchsia,
),
home: CustomScrollView(
controller: controller,
scrollDirection: Axis.horizontal,
reverse: true,
slivers: List<Widget>.generate(
20,
(int index) {
return SliverToBoxAdapter(
child: Focus(
focusNode: focusNode,
child: SizedBox(key: ValueKey<String>('Box $index'), width: 50.0),
),
);
},
),
),
),
);
focusNode.requestFocus();
await tester.pumpAndSettle();
expect(controller.position.pixels, equals(0.0));
expect(tester.getRect(find.byKey(const ValueKey<String>('Box 0'), skipOffstage: false)), equals(const Rect.fromLTRB(750.0, 0.0, 800.0, 600.00)));
// We exclude the modifier keys here for web testing since default web shortcuts
// do not use a modifier key with arrow keys for ScrollActions.
if (!kIsWeb)
await tester.sendKeyDownEvent(modifierKey);
await tester.sendKeyEvent(LogicalKeyboardKey.arrowLeft);
if (!kIsWeb)
await tester.sendKeyUpEvent(modifierKey);
await tester.pumpAndSettle();
expect(tester.getRect(find.byKey(const ValueKey<String>('Box 0'), skipOffstage: false)), equals(const Rect.fromLTRB(800.0, 0.0, 850.0, 600.0)));
if (!kIsWeb)
await tester.sendKeyDownEvent(modifierKey);
await tester.sendKeyEvent(LogicalKeyboardKey.arrowRight);
if (!kIsWeb)
await tester.sendKeyUpEvent(modifierKey);
await tester.pumpAndSettle();
});
testWidgets('Custom scrollables with a center sliver are scrolled when activated via keyboard.', (WidgetTester tester) async {
final ScrollController controller = ScrollController();
final List<String> items = List<String>.generate(20, (int index) => 'Item $index');
await tester.pumpWidget(
MaterialApp(
theme: ThemeData(
platform: TargetPlatform.fuchsia,
),
home: CustomScrollView(
controller: controller,
center: const ValueKey<String>('Center'),
slivers: items.map<Widget>(
(String item) {
return SliverToBoxAdapter(
key: item == 'Item 10' ? const ValueKey<String>('Center') : null,
child: Focus(
autofocus: item == 'Item 10',
child: Container(
key: ValueKey<String>(item),
alignment: Alignment.center,
height: 100,
child: Text(item),
),
),
);
},
).toList(),
),
),
);
await tester.pumpAndSettle();
expect(controller.position.pixels, equals(0.0));
expect(tester.getRect(find.byKey(const ValueKey<String>('Item 10'), skipOffstage: false)), equals(const Rect.fromLTRB(0.0, 0.0, 800.0, 100.0)));
for (int i = 0; i < 10; ++i) {
// We exclude the modifier keys here for web testing since default web shortcuts
// do not use a modifier key with arrow keys for ScrollActions.
if (!kIsWeb)
await tester.sendKeyDownEvent(modifierKey);
await tester.sendKeyEvent(LogicalKeyboardKey.arrowDown);
if (!kIsWeb)
await tester.sendKeyUpEvent(modifierKey);
await tester.pumpAndSettle();
}
// Starts at #10 already, so doesn't work out to 500.0 because it hits bottom.
expect(controller.position.pixels, equals(400.0));
expect(tester.getRect(find.byKey(const ValueKey<String>('Item 10'), skipOffstage: false)), equals(const Rect.fromLTRB(0.0, -400.0, 800.0, -300.0)));
for (int i = 0; i < 10; ++i) {
if (!kIsWeb)
await tester.sendKeyDownEvent(modifierKey);
await tester.sendKeyEvent(LogicalKeyboardKey.arrowUp);
if (!kIsWeb)
await tester.sendKeyUpEvent(modifierKey);
await tester.pumpAndSettle();
}
// Goes up two past "center" where it started, so negative.
expect(controller.position.pixels, equals(-100.0));
expect(tester.getRect(find.byKey(const ValueKey<String>('Item 10'), skipOffstage: false)), equals(const Rect.fromLTRB(0.0, 100.0, 800.0, 200.0)));
});
testWidgets('Can recommendDeferredLoadingForContext - animation', (WidgetTester tester) async {
final List<String> widgetTracker = <String>[];
int cheapWidgets = 0;
int expensiveWidgets = 0;
final ScrollController controller = ScrollController();
await tester.pumpWidget(Directionality(
textDirection: TextDirection.ltr,
child: ListView.builder(
controller: controller,
itemBuilder: (BuildContext context, int index) {
if (Scrollable.recommendDeferredLoadingForContext(context)) {
cheapWidgets += 1;
widgetTracker.add('cheap');
return const SizedBox(height: 50.0);
}
widgetTracker.add('expensive');
expensiveWidgets += 1;
return const SizedBox(height: 50.0);
},
),
));
await tester.pumpAndSettle();
expect(expensiveWidgets, 17);
expect(cheapWidgets, 0);
// The position value here is different from the maximum velocity we will
// reach, which is controlled by a combination of curve, duration, and
// position.
// This is just meant to be a pretty good simulation. A linear curve
// with these same parameters will never back off on the velocity enough
// to reset here.
controller.animateTo(
5000,
duration: const Duration(seconds: 2),
curve: Curves.linear,
);
expect(expensiveWidgets, 17);
expect(widgetTracker.every((String type) => type == 'expensive'), true);
await tester.pump();
await tester.pump(const Duration(milliseconds: 500));
expect(expensiveWidgets, 17);
expect(cheapWidgets, 25);
expect(widgetTracker.skip(17).every((String type) => type == 'cheap'), true);
await tester.pumpAndSettle();
expect(expensiveWidgets, 22);
expect(cheapWidgets, 95);
expect(widgetTracker.skip(17).skip(25).take(70).every((String type) => type == 'cheap'), true);
expect(widgetTracker.skip(17).skip(25).skip(70).every((String type) => type == 'expensive'), true);
});
testWidgets('Can recommendDeferredLoadingForContext - ballistics', (WidgetTester tester) async {
int cheapWidgets = 0;
int expensiveWidgets = 0;
await tester.pumpWidget(Directionality(
textDirection: TextDirection.ltr,
child: ListView.builder(
itemBuilder: (BuildContext context, int index) {
if (Scrollable.recommendDeferredLoadingForContext(context)) {
cheapWidgets += 1;
return const SizedBox(height: 50.0);
}
expensiveWidgets += 1;
return SizedBox(key: ValueKey<String>('Box $index'), height: 50.0);
},
),
));
await tester.pumpAndSettle();
expect(find.byKey(const ValueKey<String>('Box 0')), findsOneWidget);
expect(find.byKey(const ValueKey<String>('Box 52')), findsNothing);
expect(expensiveWidgets, 17);
expect(cheapWidgets, 0);
// Getting the tester to simulate a life-like fling is difficult.
// Instead, just manually drive the activity with a ballistic simulation as
// if the user has flung the list.
Scrollable.of(find.byType(SizedBox).evaluate().first)!.position.activity!.delegate.goBallistic(4000);
await tester.pumpAndSettle();
expect(find.byKey(const ValueKey<String>('Box 0')), findsNothing);
expect(find.byKey(const ValueKey<String>('Box 52')), findsOneWidget);
expect(expensiveWidgets, 38);
expect(cheapWidgets, 20);
});
testWidgets('Can recommendDeferredLoadingForContext - override heuristic', (WidgetTester tester) async {
int cheapWidgets = 0;
int expensiveWidgets = 0;
await tester.pumpWidget(Directionality(
textDirection: TextDirection.ltr,
child: ListView.builder(
physics: SuperPessimisticScrollPhysics(),
itemBuilder: (BuildContext context, int index) {
if (Scrollable.recommendDeferredLoadingForContext(context)) {
cheapWidgets += 1;
return SizedBox(key: ValueKey<String>('Cheap box $index'), height: 50.0);
}
expensiveWidgets += 1;
return SizedBox(key: ValueKey<String>('Box $index'), height: 50.0);
},
),
));
await tester.pumpAndSettle();
final ScrollPosition position = Scrollable.of(find.byType(SizedBox).evaluate().first)!.position;
final SuperPessimisticScrollPhysics physics = position.physics as SuperPessimisticScrollPhysics;
expect(find.byKey(const ValueKey<String>('Box 0')), findsOneWidget);
expect(find.byKey(const ValueKey<String>('Cheap box 52')), findsNothing);
expect(physics.count, 17);
expect(expensiveWidgets, 17);
expect(cheapWidgets, 0);
// Getting the tester to simulate a life-like fling is difficult.
// Instead, just manually drive the activity with a ballistic simulation as
// if the user has flung the list.
position.activity!.delegate.goBallistic(4000);
await tester.pumpAndSettle();
expect(find.byKey(const ValueKey<String>('Box 0')), findsNothing);
expect(find.byKey(const ValueKey<String>('Cheap box 52')), findsOneWidget);
expect(expensiveWidgets, 18);
expect(cheapWidgets, 40);
expect(physics.count, 40 + 18);
});
testWidgets('Can recommendDeferredLoadingForContext - override heuristic and always return true', (WidgetTester tester) async {
int cheapWidgets = 0;
int expensiveWidgets = 0;
await tester.pumpWidget(Directionality(
textDirection: TextDirection.ltr,
child: ListView.builder(
physics: const ExtraSuperPessimisticScrollPhysics(),
itemBuilder: (BuildContext context, int index) {
if (Scrollable.recommendDeferredLoadingForContext(context)) {
cheapWidgets += 1;
return SizedBox(key: ValueKey<String>('Cheap box $index'), height: 50.0);
}
expensiveWidgets += 1;
return SizedBox(key: ValueKey<String>('Box $index'), height: 50.0);
},
),
));
await tester.pumpAndSettle();
final ScrollPosition position = Scrollable.of(find.byType(SizedBox).evaluate().first)!.position;
expect(find.byKey(const ValueKey<String>('Cheap box 0')), findsOneWidget);
expect(find.byKey(const ValueKey<String>('Cheap box 52')), findsNothing);
expect(expensiveWidgets, 0);
expect(cheapWidgets, 17);
// Getting the tester to simulate a life-like fling is difficult.
// Instead, just manually drive the activity with a ballistic simulation as
// if the user has flung the list.
position.activity!.delegate.goBallistic(4000);
await tester.pumpAndSettle();
expect(find.byKey(const ValueKey<String>('Cheap box 0')), findsNothing);
expect(find.byKey(const ValueKey<String>('Cheap box 52')), findsOneWidget);
expect(expensiveWidgets, 0);
expect(cheapWidgets, 58);
});
testWidgets('ensureVisible does not move PageViews', (WidgetTester tester) async {
final PageController controller = PageController();
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: PageView(
controller: controller,
children: List<ListView>.generate(
3,
(int pageIndex) {
return ListView(
key: Key('list_$pageIndex'),
children: List<Widget>.generate(
100,
(int listIndex) {
return Row(
children: <Widget>[
Container(
key: Key('${pageIndex}_${listIndex}_0'),
color: Colors.red,
width: 200,
height: 10,
),
Container(
key: Key('${pageIndex}_${listIndex}_1'),
color: Colors.blue,
width: 200,
height: 10,
),
Container(
key: Key('${pageIndex}_${listIndex}_2'),
color: Colors.green,
width: 200,
height: 10,
),
]
);
}
),
);
}
)
),
),
);
final Finder targetMidRightPage0 = find.byKey(const Key('0_25_2'));
final Finder targetMidRightPage1 = find.byKey(const Key('1_25_2'));
final Finder targetMidLeftPage1 = find.byKey(const Key('1_25_0'));
expect(find.byKey(const Key('list_0')), findsOneWidget);
expect(find.byKey(const Key('list_1')), findsNothing);
expect(targetMidRightPage0, findsOneWidget);
expect(targetMidRightPage1, findsNothing);
expect(targetMidLeftPage1, findsNothing);
await tester.ensureVisible(targetMidRightPage0);
await tester.pumpAndSettle();
expect(targetMidRightPage0, findsOneWidget);
expect(targetMidRightPage1, findsNothing);
expect(targetMidLeftPage1, findsNothing);
controller.jumpToPage(1);
await tester.pumpAndSettle();
expect(find.byKey(const Key('list_0')), findsNothing);
expect(find.byKey(const Key('list_1')), findsOneWidget);
await tester.ensureVisible(targetMidRightPage1);
await tester.pumpAndSettle();
expect(targetMidRightPage0, findsNothing);
expect(targetMidRightPage1, findsOneWidget);
expect(targetMidLeftPage1, findsOneWidget);
await tester.ensureVisible(targetMidLeftPage1);
await tester.pumpAndSettle();
expect(targetMidRightPage0, findsNothing);
expect(targetMidRightPage1, findsOneWidget);
expect(targetMidLeftPage1, findsOneWidget);
});
testWidgets('ensureVisible does not move TabViews', (WidgetTester tester) async {
final TickerProvider vsync = TestTickerProvider();
final TabController controller = TabController(
length: 3,
vsync: vsync,
);
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: TabBarView(
controller: controller,
children: List<ListView>.generate(
3,
(int pageIndex) {
return ListView(
key: Key('list_$pageIndex'),
children: List<Widget>.generate(
100,
(int listIndex) {
return Row(
children: <Widget>[
Container(
key: Key('${pageIndex}_${listIndex}_0'),
color: Colors.red,
width: 200,
height: 10,
),
Container(
key: Key('${pageIndex}_${listIndex}_1'),
color: Colors.blue,
width: 200,
height: 10,
),
Container(
key: Key('${pageIndex}_${listIndex}_2'),
color: Colors.green,
width: 200,
height: 10,
),
]
);
}
),
);
}
)
),
),
);
final Finder targetMidRightPage0 = find.byKey(const Key('0_25_2'));
final Finder targetMidRightPage1 = find.byKey(const Key('1_25_2'));
final Finder targetMidLeftPage1 = find.byKey(const Key('1_25_0'));
expect(find.byKey(const Key('list_0')), findsOneWidget);
expect(find.byKey(const Key('list_1')), findsNothing);
expect(targetMidRightPage0, findsOneWidget);
expect(targetMidRightPage1, findsNothing);
expect(targetMidLeftPage1, findsNothing);
await tester.ensureVisible(targetMidRightPage0);
await tester.pumpAndSettle();
expect(targetMidRightPage0, findsOneWidget);
expect(targetMidRightPage1, findsNothing);
expect(targetMidLeftPage1, findsNothing);
controller.index = 1;
await tester.pumpAndSettle();
expect(find.byKey(const Key('list_0')), findsNothing);
expect(find.byKey(const Key('list_1')), findsOneWidget);
await tester.ensureVisible(targetMidRightPage1);
await tester.pumpAndSettle();
expect(targetMidRightPage0, findsNothing);
expect(targetMidRightPage1, findsOneWidget);
expect(targetMidLeftPage1, findsOneWidget);
await tester.ensureVisible(targetMidLeftPage1);
await tester.pumpAndSettle();
expect(targetMidRightPage0, findsNothing);
expect(targetMidRightPage1, findsOneWidget);
expect(targetMidLeftPage1, findsOneWidget);
});
testWidgets('PointerScroll on nested NeverScrollable ListView goes to outer Scrollable.', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/70948
final ScrollController outerController = ScrollController();
final ScrollController innerController = ScrollController();
await tester.pumpWidget(MaterialApp(
home: Scaffold(
body: SingleChildScrollView(
controller: outerController,
child: Container(
child: Row(
crossAxisAlignment: CrossAxisAlignment.start,
mainAxisAlignment: MainAxisAlignment.start,
children: <Widget>[
Column(
children: <Widget>[
for (int i = 0; i < 100; i++)
Text('SingleChildScrollView $i'),
]
),
Container(
height: 3000,
width: 400,
child: ListView.builder(
controller: innerController,
physics: const NeverScrollableScrollPhysics(),
itemCount: 100,
itemBuilder: (BuildContext context, int index) {
return Text('Nested NeverScrollable ListView $index');
},
)
),
]
)
)
)
),
));
expect(outerController.position.pixels, 0.0);
expect(innerController.position.pixels, 0.0);
final Offset outerScrollable = tester.getCenter(find.text('SingleChildScrollView 3'));
final TestPointer testPointer = TestPointer(1, ui.PointerDeviceKind.mouse);
// Hover over the outer scroll view and create a pointer scroll.
testPointer.hover(outerScrollable);
await tester.sendEventToBinding(testPointer.scroll(const Offset(0.0, 20.0)));
await tester.pump(const Duration(milliseconds: 250));
expect(outerController.position.pixels, 20.0);
expect(innerController.position.pixels, 0.0);
final Offset innerScrollable = tester.getCenter(find.text('Nested NeverScrollable ListView 20'));
// Hover over the inner scroll view and create a pointer scroll.
// This inner scroll view is not scrollable, and so the outer should scroll.
testPointer.hover(innerScrollable);
await tester.sendEventToBinding(testPointer.scroll(const Offset(0.0, -20.0)));
await tester.pump(const Duration(milliseconds: 250));
expect(outerController.position.pixels, 0.0);
expect(innerController.position.pixels, 0.0);
});
// Regression test for https://github.com/flutter/flutter/issues/71949
testWidgets('Zero offset pointer scroll should not trigger an assertion.', (WidgetTester tester) async {
final ScrollController controller = ScrollController();
Widget build(double height) {
return MaterialApp(
home: Scaffold(
body: SizedBox(
width: double.infinity,
height: height,
child: SingleChildScrollView(
controller: controller,
child: const SizedBox(
width: double.infinity,
height: 300.0,
),
),
)
),
);
}
await tester.pumpWidget(build(200.0));
expect(controller.position.pixels, 0.0);
controller.jumpTo(100.0);
expect(controller.position.pixels, 100.0);
// Make the outer constraints larger that the scrollable widget is no longer able to scroll.
await tester.pumpWidget(build(300.0));
expect(controller.position.pixels, 100.0);
expect(controller.position.maxScrollExtent, 0.0);
// Hover over the scroll view and create a zero offset pointer scroll.
final Offset scrollable = tester.getCenter(find.byType(SingleChildScrollView));
final TestPointer testPointer = TestPointer(1, ui.PointerDeviceKind.mouse);
testPointer.hover(scrollable);
await tester.sendEventToBinding(testPointer.scroll(Offset.zero));
expect(tester.takeException(), null);
});
}
// ignore: must_be_immutable
class SuperPessimisticScrollPhysics extends ScrollPhysics {
SuperPessimisticScrollPhysics({ScrollPhysics? parent}) : super(parent: parent);
int count = 0;
@override
bool recommendDeferredLoading(double velocity, ScrollMetrics metrics, BuildContext context) {
count++;
return velocity > 1;
}
@override
ScrollPhysics applyTo(ScrollPhysics? ancestor) {
return SuperPessimisticScrollPhysics(parent: buildParent(ancestor));
}
}
class ExtraSuperPessimisticScrollPhysics extends ScrollPhysics {
const ExtraSuperPessimisticScrollPhysics({ScrollPhysics? parent}) : super(parent: parent);
@override
bool recommendDeferredLoading(double velocity, ScrollMetrics metrics, BuildContext context) {
return true;
}
@override
ScrollPhysics applyTo(ScrollPhysics? ancestor) {
return ExtraSuperPessimisticScrollPhysics(parent: buildParent(ancestor));
}
}
class TestTickerProvider extends TickerProvider {
@override
Ticker createTicker(TickerCallback onTick) {
return Ticker(onTick);
}
}