blob: 9625708c472377512a52b13254f7e695115e5173 [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 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter_test/flutter_test.dart';
import '../rendering/mock_canvas.dart';
import 'semantics_tester.dart';
Future<void> test(WidgetTester tester, double offset, { double anchor = 0.0 }) {
return tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Viewport(
anchor: anchor / 600.0,
offset: ViewportOffset.fixed(offset),
slivers: const <Widget>[
SliverToBoxAdapter(child: SizedBox(height: 400.0)),
SliverToBoxAdapter(child: SizedBox(height: 400.0)),
SliverToBoxAdapter(child: SizedBox(height: 400.0)),
SliverToBoxAdapter(child: SizedBox(height: 400.0)),
SliverToBoxAdapter(child: SizedBox(height: 400.0)),
],
),
),
);
}
Future<void> testSliverFixedExtentList(WidgetTester tester, List<String> items) {
return tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: CustomScrollView(
slivers: <Widget>[
SliverFixedExtentList(
itemExtent: 900,
delegate: SliverChildBuilderDelegate(
(BuildContext context, int index) {
return Center(
key: ValueKey<String>(items[index]),
child: KeepAlive(
items[index],
),
);
},
childCount : items.length,
findChildIndexCallback: (Key key) {
final ValueKey<String> valueKey = key as ValueKey<String>;
return items.indexOf(valueKey.value);
},
),
),
],
),
),
);
}
void verify(WidgetTester tester, List<Offset> idealPositions, List<bool> idealVisibles) {
final List<Offset> actualPositions = tester.renderObjectList<RenderBox>(find.byType(SizedBox, skipOffstage: false)).map<Offset>(
(RenderBox target) => target.localToGlobal(Offset.zero)
).toList();
final List<bool> actualVisibles = tester.renderObjectList<RenderSliverToBoxAdapter>(find.byType(SliverToBoxAdapter, skipOffstage: false)).map<bool>(
(RenderSliverToBoxAdapter target) => target.geometry!.visible
).toList();
expect(actualPositions, equals(idealPositions));
expect(actualVisibles, equals(idealVisibles));
}
void main() {
testWidgets('Viewport basic test', (WidgetTester tester) async {
await test(tester, 0.0);
expect(tester.renderObject<RenderBox>(find.byType(Viewport)).size, equals(const Size(800.0, 600.0)));
verify(tester, <Offset>[
Offset.zero,
const Offset(0.0, 400.0),
const Offset(0.0, 800.0),
const Offset(0.0, 1200.0),
const Offset(0.0, 1600.0),
], <bool>[true, true, false, false, false]);
await test(tester, 200.0);
verify(tester, <Offset>[
const Offset(0.0, -200.0),
const Offset(0.0, 200.0),
const Offset(0.0, 600.0),
const Offset(0.0, 1000.0),
const Offset(0.0, 1400.0),
], <bool>[true, true, false, false, false]);
await test(tester, 600.0);
verify(tester, <Offset>[
const Offset(0.0, -600.0),
const Offset(0.0, -200.0),
const Offset(0.0, 200.0),
const Offset(0.0, 600.0),
const Offset(0.0, 1000.0),
], <bool>[false, true, true, false, false]);
await test(tester, 900.0);
verify(tester, <Offset>[
const Offset(0.0, -900.0),
const Offset(0.0, -500.0),
const Offset(0.0, -100.0),
const Offset(0.0, 300.0),
const Offset(0.0, 700.0),
], <bool>[false, false, true, true, false]);
});
testWidgets('Viewport anchor test', (WidgetTester tester) async {
await test(tester, 0.0, anchor: 100.0);
expect(tester.renderObject<RenderBox>(find.byType(Viewport)).size, equals(const Size(800.0, 600.0)));
verify(tester, <Offset>[
const Offset(0.0, 100.0),
const Offset(0.0, 500.0),
const Offset(0.0, 900.0),
const Offset(0.0, 1300.0),
const Offset(0.0, 1700.0),
], <bool>[true, true, false, false, false]);
await test(tester, 200.0, anchor: 100.0);
verify(tester, <Offset>[
const Offset(0.0, -100.0),
const Offset(0.0, 300.0),
const Offset(0.0, 700.0),
const Offset(0.0, 1100.0),
const Offset(0.0, 1500.0),
], <bool>[true, true, false, false, false]);
await test(tester, 600.0, anchor: 100.0);
verify(tester, <Offset>[
const Offset(0.0, -500.0),
const Offset(0.0, -100.0),
const Offset(0.0, 300.0),
const Offset(0.0, 700.0),
const Offset(0.0, 1100.0),
], <bool>[false, true, true, false, false]);
await test(tester, 900.0, anchor: 100.0);
verify(tester, <Offset>[
const Offset(0.0, -800.0),
const Offset(0.0, -400.0),
Offset.zero,
const Offset(0.0, 400.0),
const Offset(0.0, 800.0),
], <bool>[false, false, true, true, false]);
});
testWidgets('Multiple grids and lists', (WidgetTester tester) async {
await tester.pumpWidget(
Center(
child: SizedBox(
width: 44.4,
height: 60.0,
child: Directionality(
textDirection: TextDirection.ltr,
child: CustomScrollView(
slivers: <Widget>[
SliverList(
delegate: SliverChildListDelegate(
<Widget>[
Container(height: 22.2, child: const Text('TOP')),
Container(height: 22.2),
Container(height: 22.2),
],
),
),
SliverFixedExtentList(
itemExtent: 22.2,
delegate: SliverChildListDelegate(
<Widget>[
Container(),
Container(child: const Text('A')),
Container(),
],
),
),
SliverGrid(
gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: 2,
),
delegate: SliverChildListDelegate(
<Widget>[
Container(),
Container(child: const Text('B')),
Container(),
],
),
),
SliverList(
delegate: SliverChildListDelegate(
<Widget>[
Container(height: 22.2),
Container(height: 22.2),
Container(height: 22.2, child: const Text('BOTTOM')),
],
),
),
],
),
),
),
),
);
final TestGesture gesture = await tester.startGesture(const Offset(400.0, 300.0));
expect(find.text('TOP'), findsOneWidget);
expect(find.text('A'), findsNothing);
expect(find.text('B'), findsNothing);
expect(find.text('BOTTOM'), findsNothing);
await gesture.moveBy(const Offset(0.0, -70.0));
await tester.pump();
expect(find.text('TOP'), findsNothing);
expect(find.text('A'), findsOneWidget);
expect(find.text('B'), findsNothing);
expect(find.text('BOTTOM'), findsNothing);
await gesture.moveBy(const Offset(0.0, -70.0));
await tester.pump();
expect(find.text('TOP'), findsNothing);
expect(find.text('A'), findsNothing);
expect(find.text('B'), findsOneWidget);
expect(find.text('BOTTOM'), findsNothing);
await gesture.moveBy(const Offset(0.0, -70.0));
await tester.pump();
expect(find.text('TOP'), findsNothing);
expect(find.text('A'), findsNothing);
expect(find.text('B'), findsNothing);
expect(find.text('BOTTOM'), findsOneWidget);
});
testWidgets('SliverFixedExtentList correctly clears garbage', (WidgetTester tester) async {
final List<String> items = <String>['1', '2', '3', '4', '5', '6'];
await testSliverFixedExtentList(tester, items);
// Keep alive widgets require 1 frame to notify their parents. Pumps in between
// drags to ensure widgets are kept alive.
await tester.drag(find.byType(CustomScrollView),const Offset(0.0, -1200.0));
await tester.pump();
await tester.drag(find.byType(CustomScrollView),const Offset(0.0, -1200.0));
await tester.pump();
await tester.drag(find.byType(CustomScrollView),const Offset(0.0, -800.0));
await tester.pump();
expect(find.text('1'), findsNothing);
expect(find.text('2'), findsNothing);
expect(find.text('3'), findsNothing);
expect(find.text('4'), findsOneWidget);
expect(find.text('5'), findsOneWidget);
// Indexes [0, 1, 2] are kept alive and [3, 4] are in viewport, thus the sliver
// will need to keep updating the elements at these indexes whenever a rebuild is
// triggered. The current child list in RenderSliverFixedExtentList is
// '4' -> '5' -> null.
//
// With the insertion below, all items will get shifted back 1 position. The sliver
// will have to update indexes [0, 1, 2, 3, 4, 5]. Since this is the first time
// item '0' gets initialized, mounting the element will cause it to attach to
// child list in RenderSliverFixedExtentList. This will create a gap.
// '0' -> '4' -> '5' -> null.
items.insert(0, '0');
await testSliverFixedExtentList(tester, items);
// Sliver should collect leading and trailing garbage correctly.
//
// The child list update should occur in following order.
// '0' -> '4' -> '5' -> null Started with Original list.
// '4' -> null Removed 1 leading garbage and 1 trailing garbage.
// '3' -> '4' -> null Prepended '3' because viewport is still at [3, 4].
expect(find.text('0'), findsNothing);
expect(find.text('1'), findsNothing);
expect(find.text('2'), findsNothing);
expect(find.text('3'), findsOneWidget);
expect(find.text('4'), findsOneWidget);
});
testWidgets('SliverFixedExtentList handles underflow when its children changes', (WidgetTester tester) async {
final List<String> items = <String>['1', '2', '3', '4', '5', '6'];
final List<String> initializedChild = <String>[];
List<Widget> children = <Widget>[];
for (final String item in items) {
children.add(
StateInitSpy(
item, () => initializedChild.add(item), key: ValueKey<String>(item),
)
);
}
final ScrollController controller = ScrollController(initialScrollOffset: 5400);
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: CustomScrollView(
controller: controller,
slivers: <Widget>[
SliverFixedExtentList(
itemExtent: 900,
delegate: SliverChildListDelegate(children),
),
],
),
),
);
await tester.pumpAndSettle();
expect(find.text('1'), findsNothing);
expect(find.text('2'), findsNothing);
expect(find.text('3'), findsNothing);
expect(find.text('4'), findsNothing);
expect(find.text('5'), findsNothing);
expect(find.text('6'), findsOneWidget);
expect(listEquals<String>(initializedChild, <String>['6']), isTrue);
// move to item 1 and swap the children at the same time
controller.jumpTo(0);
final Widget temp = children[5];
children[5] = children[0];
children[0] = temp;
children = List<Widget>.from(children);
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: CustomScrollView(
controller: controller,
slivers: <Widget>[
SliverFixedExtentList(
itemExtent: 900,
delegate: SliverChildListDelegate(children),
),
],
),
),
);
expect(find.text('1'), findsNothing);
expect(find.text('2'), findsNothing);
expect(find.text('3'), findsNothing);
expect(find.text('4'), findsNothing);
expect(find.text('5'), findsNothing);
expect(find.text('6'), findsOneWidget);
// None of the children should be built.
expect(listEquals<String>(initializedChild, <String>['6']), isTrue);
});
testWidgets(
'SliverGrid Correctly layout children after rearranging',
(WidgetTester tester) async {
await tester.pumpWidget(const TestSliverGrid(
<Widget>[
Text('item0', key: Key('0')),
Text('item1', key: Key('1')),
],
));
await tester.pumpWidget(const TestSliverGrid(
<Widget>[
Text('item0', key: Key('0')),
Text('item3', key: Key('3')),
Text('item4', key: Key('4')),
Text('item1', key: Key('1')),
],
));
expect(find.text('item0'), findsOneWidget);
expect(find.text('item3'), findsOneWidget);
expect(find.text('item4'), findsOneWidget);
expect(find.text('item1'), findsOneWidget);
final Offset item0Location = tester.getCenter(find.text('item0'));
final Offset item3Location = tester.getCenter(find.text('item3'));
final Offset item4Location = tester.getCenter(find.text('item4'));
final Offset item1Location = tester.getCenter(find.text('item1'));
expect(isRight(item0Location, item3Location) && sameHorizontal(item0Location, item3Location), true);
expect(isBelow(item0Location, item4Location) && sameVertical(item0Location, item4Location), true);
expect(isBelow(item0Location, item1Location) && isRight(item0Location, item1Location), true);
},
);
testWidgets(
'SliverGrid negative usableCrossAxisExtent',
(WidgetTester tester) async {
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Center(
child: SizedBox(
width: 4,
height: 4,
child: CustomScrollView(
slivers: <Widget>[
SliverGrid(
gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: 2,
crossAxisSpacing: 8,
mainAxisSpacing: 8,
),
delegate: SliverChildListDelegate(
<Widget>[
Container(child: const Center(child: Text('A'))),
Container(child: const Center(child: Text('B'))),
Container(child: const Center(child: Text('C'))),
Container(child: const Center(child: Text('D'))),
],
),
),
],
),
),
),
),
);
expect(tester.takeException(), isNull);
},
);
testWidgets(
'SliverList can handle inaccurate scroll offset due to changes in children list',
(WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/pull/59888.
bool skip = true;
Widget _buildItem(BuildContext context, int index) {
return !skip || index.isEven
? Card(
child: ListTile(
title: Text(
'item$index',
style: const TextStyle(fontSize: 80),
),
),
)
: Container();
}
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: CustomScrollView(
slivers: <Widget> [
SliverList(
delegate: SliverChildBuilderDelegate(
_buildItem,
childCount: 30,
),
),
],
)
),
),
);
// Only even items 0~12 are on the screen.
expect(find.text('item0'), findsOneWidget);
expect(find.text('item12'), findsOneWidget);
expect(find.text('item14'), findsNothing);
await tester.drag(find.byType(CustomScrollView), const Offset(0.0, -750.0));
await tester.pump();
// Only even items 16~28 are on the screen.
expect(find.text('item15'), findsNothing);
expect(find.text('item16'), findsOneWidget);
expect(find.text('item28'), findsOneWidget);
skip = false;
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: CustomScrollView(
slivers: <Widget> [
SliverList(
delegate: SliverChildBuilderDelegate(
_buildItem,
childCount: 30,
),
),
],
)
),
),
);
// Only items 12~19 are on the screen.
expect(find.text('item11'), findsNothing);
expect(find.text('item12'), findsOneWidget);
expect(find.text('item19'), findsOneWidget);
expect(find.text('item20'), findsNothing);
await tester.drag(find.byType(CustomScrollView), const Offset(0.0, 250.0));
await tester.pump();
// Only items 10~16 are on the screen.
expect(find.text('item9'), findsNothing);
expect(find.text('item10'), findsOneWidget);
expect(find.text('item16'), findsOneWidget);
expect(find.text('item17'), findsNothing);
// The inaccurate scroll offset should reach zero at this point
await tester.drag(find.byType(CustomScrollView), const Offset(0.0, 250.0));
await tester.pump();
// Only items 7~13 are on the screen.
expect(find.text('item6'), findsNothing);
expect(find.text('item7'), findsOneWidget);
expect(find.text('item13'), findsOneWidget);
expect(find.text('item14'), findsNothing);
// It will be corrected as we scroll, so we have to drag multiple times.
await tester.drag(find.byType(CustomScrollView), const Offset(0.0, 250.0));
await tester.pump();
await tester.drag(find.byType(CustomScrollView), const Offset(0.0, 250.0));
await tester.pump();
await tester.drag(find.byType(CustomScrollView), const Offset(0.0, 250.0));
await tester.pump();
// Only items 0~6 are on the screen.
expect(find.text('item0'), findsOneWidget);
expect(find.text('item6'), findsOneWidget);
expect(find.text('item7'), findsNothing);
},
);
testWidgets(
'SliverFixedExtentList Correctly layout children after rearranging',
(WidgetTester tester) async {
await tester.pumpWidget(const TestSliverFixedExtentList(
<Widget>[
Text('item0', key: Key('0')),
Text('item2', key: Key('2')),
Text('item1', key: Key('1')),
],
));
await tester.pumpWidget(const TestSliverFixedExtentList(
<Widget>[
Text('item0', key: Key('0')),
Text('item3', key: Key('3')),
Text('item1', key: Key('1')),
Text('item4', key: Key('4')),
Text('item2', key: Key('2')),
],
));
expect(find.text('item0'), findsOneWidget);
expect(find.text('item3'), findsOneWidget);
expect(find.text('item1'), findsOneWidget);
expect(find.text('item4'), findsOneWidget);
expect(find.text('item2'), findsOneWidget);
final Offset item0Location = tester.getCenter(find.text('item0'));
final Offset item3Location = tester.getCenter(find.text('item3'));
final Offset item1Location = tester.getCenter(find.text('item1'));
final Offset item4Location = tester.getCenter(find.text('item4'));
final Offset item2Location = tester.getCenter(find.text('item2'));
expect(isBelow(item0Location, item3Location) && sameVertical(item0Location, item3Location), true);
expect(isBelow(item3Location, item1Location) && sameVertical(item3Location, item1Location), true);
expect(isBelow(item1Location, item4Location) && sameVertical(item1Location, item4Location), true);
expect(isBelow(item4Location, item2Location) && sameVertical(item4Location, item2Location), true);
},
);
testWidgets('Can override ErrorWidget.build', (WidgetTester tester) async {
const Text errorText = Text('error');
final ErrorWidgetBuilder oldBuilder = ErrorWidget.builder;
ErrorWidget.builder = (FlutterErrorDetails details) => errorText;
final SliverChildBuilderDelegate builderThrowsDelegate = SliverChildBuilderDelegate(
(_, __) => throw 'builder',
addAutomaticKeepAlives: false,
addRepaintBoundaries: false,
addSemanticIndexes: false,
);
final KeyedSubtree wrapped = builderThrowsDelegate.build(_NullBuildContext(), 0)! as KeyedSubtree;
expect(wrapped.child, errorText);
expect(tester.takeException(), 'builder');
ErrorWidget.builder = oldBuilder;
});
testWidgets('SliverFixedExtentList with SliverChildBuilderDelegate auto-correct scroll offset - super fast', (WidgetTester tester) async {
final ScrollController controller = ScrollController(initialScrollOffset: 600);
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: CustomScrollView(
controller: controller,
cacheExtent: 0,
slivers: <Widget>[
SliverFixedExtentList(
itemExtent: 200,
delegate: SliverChildBuilderDelegate(
(BuildContext context, int index) {
if (index <= 6) {
return Center(child: Text('Page $index'));
}
return null;
},
),
),
],
),
),
);
expect(find.text('Page 0'), findsNothing);
expect(find.text('Page 6'), findsNothing);
await tester.drag(find.text('Page 5'), const Offset(0, -1000));
// Controller will be temporarily over-scrolled (before the frame triggered by the drag) because
// SliverFixedExtentList doesn't report its size until it has built its last child, so the
// maxScrollExtent is infinite, so when we move by 1000 pixels in one go, we go all the way.
//
// This never actually gets rendered, it's just the controller state before we lay out.
expect(controller.offset, 1600.0);
// However, once we pump, the scroll offset gets clamped to the newly discovered maximum, which
// is the itemExtent (200) times the number of items (7) minus the height of the viewport (600).
// This adds up to 800.0.
await tester.pump();
expect(find.text('Page 0'), findsNothing);
expect(find.text('Page 6'), findsOneWidget);
expect(controller.offset, 800.0);
expect(await tester.pumpAndSettle(), 1); // there should be no animation here
expect(controller.offset, 800.0);
});
testWidgets('SliverFixedExtentList with SliverChildBuilderDelegate auto-correct scroll offset - reasonable', (WidgetTester tester) async {
final ScrollController controller = ScrollController(initialScrollOffset: 600);
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: CustomScrollView(
controller: controller,
cacheExtent: 0,
slivers: <Widget>[
SliverFixedExtentList(
itemExtent: 200,
delegate: SliverChildBuilderDelegate(
(BuildContext context, int index) {
if (index <= 6) {
return Center(child: Text('Page $index'));
}
return null;
},
),
),
],
),
),
);
await tester.drag(find.text('Page 5'), const Offset(0, -210));
// Controller will be temporarily over-scrolled.
expect(controller.offset, 810.0);
await tester.pumpAndSettle();
// It will be corrected after a auto scroll animation.
expect(controller.offset, 800.0);
});
Widget _boilerPlate(Widget sliver) {
return Localizations(
locale: const Locale('en', 'us'),
delegates: const <LocalizationsDelegate<dynamic>>[
DefaultWidgetsLocalizations.delegate,
DefaultMaterialLocalizations.delegate,
],
child: Directionality(
textDirection: TextDirection.ltr,
child: MediaQuery(
data: const MediaQueryData(),
child: CustomScrollView(slivers: <Widget>[sliver])
)
)
);
}
group('SliverOffstage - ', () {
testWidgets('offstage true', (WidgetTester tester) async {
final SemanticsTester semantics = SemanticsTester(tester);
await tester.pumpWidget(_boilerPlate(
const SliverOffstage(
offstage: true,
sliver: SliverToBoxAdapter(
child: Text('a'),
)
)
));
expect(semantics.nodesWith(label: 'a'), hasLength(0));
expect(find.byType(Text), findsNothing);
final RenderViewport renderViewport = tester.renderObject(find.byType(Viewport));
final RenderSliver renderSliver = renderViewport.lastChild!;
expect(renderSliver.geometry!.scrollExtent, 0.0);
expect(find.byType(SliverOffstage), findsNothing);
});
testWidgets('offstage false', (WidgetTester tester) async {
final SemanticsTester semantics = SemanticsTester(tester);
await tester.pumpWidget(_boilerPlate(
const SliverOffstage(
offstage: false,
sliver: SliverToBoxAdapter(
child: Text('a'),
)
)
));
expect(semantics.nodesWith(label: 'a'), hasLength(1));
expect(find.byType(Text), findsOneWidget);
final RenderViewport renderViewport = tester.renderObject(find.byType(Viewport));
final RenderSliver renderSliver = renderViewport.lastChild!;
expect(renderSliver.geometry!.scrollExtent, 14.0);
expect(find.byType(SliverOffstage), paints..paragraph());
});
});
group('SliverOpacity - ', () {
testWidgets('painting & semantics', (WidgetTester tester) async {
final SemanticsTester semantics = SemanticsTester(tester);
// Opacity 1.0: Semantics and painting
await tester.pumpWidget(_boilerPlate(
const SliverOpacity(
sliver: SliverToBoxAdapter(
child: Text(
'a',
textDirection: TextDirection.rtl,
)
),
opacity: 1.0,
),
));
expect(semantics.nodesWith(label: 'a'), hasLength(1));
expect(find.byType(SliverOpacity), paints..paragraph());
// Opacity 0.0: Nothing
await tester.pumpWidget(_boilerPlate(
const SliverOpacity(
sliver: SliverToBoxAdapter(
child: Text(
'a',
textDirection: TextDirection.rtl,
)
),
opacity: 0.0,
)
));
expect(semantics.nodesWith(label: 'a'), hasLength(0));
expect(find.byType(SliverOpacity), paintsNothing);
// Opacity 0.0 with semantics: Just semantics
await tester.pumpWidget(_boilerPlate(
const SliverOpacity(
sliver: SliverToBoxAdapter(
child: Text(
'a',
textDirection: TextDirection.rtl,
)
),
opacity: 0.0,
alwaysIncludeSemantics: true,
),
));
expect(semantics.nodesWith(label: 'a'), hasLength(1));
expect(find.byType(SliverOpacity), paintsNothing);
// Opacity 0.0 without semantics: Nothing
await tester.pumpWidget(_boilerPlate(
const SliverOpacity(
sliver: SliverToBoxAdapter(
child: Text(
'a',
textDirection: TextDirection.rtl,
)
),
opacity: 0.0,
alwaysIncludeSemantics: false,
),
));
expect(semantics.nodesWith(label: 'a'), hasLength(0));
expect(find.byType(SliverOpacity), paintsNothing);
// Opacity 0.1: Semantics and painting
await tester.pumpWidget(_boilerPlate(
const SliverOpacity(
sliver: SliverToBoxAdapter(
child: Text(
'a',
textDirection: TextDirection.rtl,
)
),
opacity: 0.1,
),
));
expect(semantics.nodesWith(label: 'a'), hasLength(1));
expect(find.byType(SliverOpacity), paints..paragraph());
// Opacity 0.1 without semantics: Still has semantics and painting
await tester.pumpWidget(_boilerPlate(
const SliverOpacity(
sliver: SliverToBoxAdapter(
child: Text(
'a',
textDirection: TextDirection.rtl,
)
),
opacity: 0.1,
alwaysIncludeSemantics: false,
),
));
expect(semantics.nodesWith(label: 'a'), hasLength(1));
expect(find.byType(SliverOpacity), paints..paragraph());
// Opacity 0.1 with semantics: Semantics and painting
await tester.pumpWidget(_boilerPlate(
const SliverOpacity(
sliver: SliverToBoxAdapter(
child: Text(
'a',
textDirection: TextDirection.rtl,
)
),
opacity: 0.1,
alwaysIncludeSemantics: true,
),
));
expect(semantics.nodesWith(label: 'a'), hasLength(1));
expect(find.byType(SliverOpacity), paints..paragraph());
semantics.dispose();
});
});
group('SliverIgnorePointer - ', () {
testWidgets('ignores pointer events', (WidgetTester tester) async {
final SemanticsTester semantics = SemanticsTester(tester);
final List<String> events = <String>[];
await tester.pumpWidget(_boilerPlate(
SliverIgnorePointer(
ignoring: true,
ignoringSemantics: false,
sliver: SliverToBoxAdapter(
child: GestureDetector(
child: const Text('a'),
onTap: () {
events.add('tap');
},
)
)
)
));
expect(semantics.nodesWith(label: 'a'), hasLength(1));
await tester.tap(find.byType(GestureDetector), warnIfMissed: false);
expect(events, equals(<String>[]));
});
testWidgets('ignores semantics', (WidgetTester tester) async {
final SemanticsTester semantics = SemanticsTester(tester);
final List<String> events = <String>[];
await tester.pumpWidget(_boilerPlate(
SliverIgnorePointer(
ignoring: false,
ignoringSemantics: true,
sliver: SliverToBoxAdapter(
child: GestureDetector(
child: const Text('a'),
onTap: () {
events.add('tap');
},
)
)
)
));
expect(semantics.nodesWith(label: 'a'), hasLength(0));
await tester.tap(find.byType(GestureDetector));
expect(events, equals(<String>['tap']));
});
testWidgets('ignores pointer events & semantics', (WidgetTester tester) async {
final SemanticsTester semantics = SemanticsTester(tester);
final List<String> events = <String>[];
await tester.pumpWidget(_boilerPlate(
SliverIgnorePointer(
ignoring: true,
ignoringSemantics: true,
sliver: SliverToBoxAdapter(
child: GestureDetector(
child: const Text('a'),
onTap: () {
events.add('tap');
},
)
)
)
));
expect(semantics.nodesWith(label: 'a'), hasLength(0));
await tester.tap(find.byType(GestureDetector), warnIfMissed: false);
expect(events, equals(<String>[]));
});
testWidgets('ignores nothing', (WidgetTester tester) async {
final SemanticsTester semantics = SemanticsTester(tester);
final List<String> events = <String>[];
await tester.pumpWidget(_boilerPlate(
SliverIgnorePointer(
ignoring: false,
ignoringSemantics: false,
sliver: SliverToBoxAdapter(
child: GestureDetector(
child: const Text('a'),
onTap: () {
events.add('tap');
},
)
)
)
));
expect(semantics.nodesWith(label: 'a'), hasLength(1));
await tester.tap(find.byType(GestureDetector));
expect(events, equals(<String>['tap']));
});
});
testWidgets('SliverList handles 0 scrollOffsetCorrection', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/62198
await tester.pumpWidget(MaterialApp(
home: Scaffold(
body: CustomScrollView(
physics: const BouncingScrollPhysics(parent: AlwaysScrollableScrollPhysics()),
slivers: <Widget>[
SliverList(
delegate: SliverChildListDelegate(
const <Widget>[
SizedBox.shrink(),
Text('index 1'),
Text('index 2'),
]
),
),
],
)
),
));
await tester.fling(find.byType(Scrollable), const Offset(0.0, -500.0), 10000.0);
await tester.pumpAndSettle();
expect(tester.takeException(), isNull);
});
testWidgets('SliverGrid children can be arbitrarily placed', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/64006
int firstTapped = 0;
int secondTapped = 0;
final Key key = UniqueKey();
await tester.pumpWidget(MaterialApp(
home: Scaffold(
key: key,
body: CustomScrollView(
slivers: <Widget>[
SliverGrid(
delegate: SliverChildBuilderDelegate(
(BuildContext context, int index) {
return Container(
child: Material(
color: index.isEven ? Colors.yellow : Colors.red,
child: InkWell(
onTap: () {
index.isEven ? firstTapped++ : secondTapped++;
},
child: Text('Index $index'),
),
),
);
},
childCount: 2,
),
gridDelegate: _TestArbitrarySliverGridDelegate(),
)
],
),
)
));
// Assertion not triggered by arbitrary placement
expect(tester.takeException(), isNull);
// Verify correct hit testing
await tester.tap(find.text('Index 0'));
expect(firstTapped, 1);
expect(secondTapped, 0);
await tester.tap(find.text('Index 1'));
expect(firstTapped, 1);
expect(secondTapped, 1);
// Check other places too
final Offset bottomLeft = tester.getBottomLeft(find.byKey(key));
await tester.tapAt(bottomLeft);
expect(firstTapped, 1);
expect(secondTapped, 1);
final Offset topRight = tester.getTopRight(find.byKey(key));
await tester.tapAt(topRight);
expect(firstTapped, 1);
expect(secondTapped, 1);
await tester.tapAt(const Offset(100.0, 100.0));
expect(firstTapped, 1);
expect(secondTapped, 1);
await tester.tapAt(const Offset(700.0, 500.0));
expect(firstTapped, 1);
expect(secondTapped, 1);
});
}
bool isRight(Offset a, Offset b) => b.dx > a.dx;
bool isBelow(Offset a, Offset b) => b.dy > a.dy;
bool sameHorizontal(Offset a, Offset b) => b.dy == a.dy;
bool sameVertical(Offset a, Offset b) => b.dx == a.dx;
class TestSliverGrid extends StatelessWidget {
const TestSliverGrid(this.children, { Key? key }) : super(key: key);
final List<Widget> children;
@override
Widget build(BuildContext context) {
return Directionality(
textDirection: TextDirection.ltr,
child: CustomScrollView(
slivers: <Widget> [
SliverGrid(
delegate: SliverChildListDelegate(
children,
),
gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: 2,
),
),
],
),
);
}
}
class _TestArbitrarySliverGridDelegate implements SliverGridDelegate {
@override
SliverGridLayout getLayout(SliverConstraints constraints) {
return _TestArbitrarySliverGridLayout();
}
@override
bool shouldRelayout(SliverGridDelegate oldDelegate) {
return false;
}
}
class _TestArbitrarySliverGridLayout implements SliverGridLayout {
@override
double computeMaxScrollOffset(int childCount) => 1000;
@override
int getMinChildIndexForScrollOffset(double scrollOffset) => 0;
@override
int getMaxChildIndexForScrollOffset(double scrollOffset) => 2;
@override
SliverGridGeometry getGeometryForChildIndex(int index) {
return SliverGridGeometry(
scrollOffset: index * 100.0 + 300.0,
crossAxisOffset: 200.0,
mainAxisExtent: 100.0,
crossAxisExtent: 100.0,
);
}
}
class TestSliverFixedExtentList extends StatelessWidget {
const TestSliverFixedExtentList(this.children, { Key? key }) : super(key: key);
final List<Widget> children;
@override
Widget build(BuildContext context) {
return Directionality(
textDirection: TextDirection.ltr,
child: CustomScrollView(
slivers: <Widget> [
SliverFixedExtentList(
itemExtent: 10.0,
delegate: SliverChildListDelegate(
children,
),
),
],
),
);
}
}
class StateInitSpy extends StatefulWidget {
const StateInitSpy(this.data, this.onStateInit, { Key? key }) : super(key: key);
final String data;
final VoidCallback onStateInit;
@override
StateInitSpyState createState() => StateInitSpyState();
}
class StateInitSpyState extends State<StateInitSpy> {
@override
void initState() {
super.initState();
widget.onStateInit();
}
@override
Widget build(BuildContext context) {
return Text(widget.data);
}
}
class KeepAlive extends StatefulWidget {
const KeepAlive(this.data, { Key? key }) : super(key: key);
final String data;
@override
KeepAliveState createState() => KeepAliveState();
}
class KeepAliveState extends State<KeepAlive> with AutomaticKeepAliveClientMixin {
@override
bool get wantKeepAlive => true;
@override
Widget build(BuildContext context) {
super.build(context);
return Text(widget.data);
}
}
class _NullBuildContext implements BuildContext {
@override
dynamic noSuchMethod(Invocation invocation) => throw UnimplementedError();
}