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flutter-go/packages/flutter_web/test/widgets/automatic_keep_alive_test.dart
ryan da67ccf5a8 Add:创建 flutter go web 版
2019-08-13 20:38:46 +08:00

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// Copyright 2017 The Chromium 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_web/rendering.dart';
import 'package:flutter_web/widgets.dart';
import 'package:flutter_web_test/flutter_web_test.dart';
class Leaf extends StatefulWidget {
const Leaf({Key key, this.child}) : super(key: key);
final Widget child;
@override
_LeafState createState() => _LeafState();
}
class _LeafState extends State<Leaf> {
bool _keepAlive = false;
KeepAliveHandle _handle;
@override
void deactivate() {
_handle?.release();
_handle = null;
super.deactivate();
}
void setKeepAlive(bool value) {
_keepAlive = value;
if (_keepAlive) {
if (_handle == null) {
_handle = KeepAliveHandle();
KeepAliveNotification(_handle).dispatch(context);
}
} else {
_handle?.release();
_handle = null;
}
}
@override
Widget build(BuildContext context) {
if (_keepAlive && _handle == null) {
_handle = KeepAliveHandle();
KeepAliveNotification(_handle).dispatch(context);
}
return widget.child;
}
}
List<Widget> generateList(Widget child, {@required bool impliedMode}) {
return List<Widget>.generate(
100,
(int index) {
final Widget result = Leaf(
key: GlobalObjectKey<_LeafState>(index),
child: child,
);
if (impliedMode) return result;
return AutomaticKeepAlive(child: result);
},
growable: false,
);
}
void tests({@required bool impliedMode}) {
testWidgets('AutomaticKeepAlive with ListView with itemExtent',
(WidgetTester tester) async {
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: ListView(
addAutomaticKeepAlives: impliedMode,
addRepaintBoundaries: impliedMode,
addSemanticIndexes: false,
itemExtent: 12.3, // about 50 widgets visible
cacheExtent: 0.0,
children: generateList(const Placeholder(), impliedMode: impliedMode),
),
),
);
expect(find.byKey(const GlobalObjectKey<_LeafState>(3)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(30)), findsOneWidget);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(59), skipOffstage: false),
findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(60), skipOffstage: false),
findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(61), skipOffstage: false),
findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(90), skipOffstage: false),
findsNothing);
await tester.drag(find.byType(ListView),
const Offset(0.0, -300.0)); // about 25 widgets' worth
await tester.pump();
expect(
find.byKey(const GlobalObjectKey<_LeafState>(3), skipOffstage: false),
findsNothing);
expect(find.byKey(const GlobalObjectKey<_LeafState>(30)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(59)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(60)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(61)), findsOneWidget);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(90), skipOffstage: false),
findsNothing);
const GlobalObjectKey<_LeafState>(60).currentState.setKeepAlive(true);
await tester.drag(
find.byType(ListView), const Offset(0.0, 300.0)); // back to top
await tester.pump();
expect(find.byKey(const GlobalObjectKey<_LeafState>(3)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(30)), findsOneWidget);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(59), skipOffstage: false),
findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(60), skipOffstage: false),
findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(60)), findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(61), skipOffstage: false),
findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(90), skipOffstage: false),
findsNothing);
const GlobalObjectKey<_LeafState>(60).currentState.setKeepAlive(false);
await tester.pump();
expect(find.byKey(const GlobalObjectKey<_LeafState>(3)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(30)), findsOneWidget);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(59), skipOffstage: false),
findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(60), skipOffstage: false),
findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(61), skipOffstage: false),
findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(90), skipOffstage: false),
findsNothing);
});
testWidgets('AutomaticKeepAlive with ListView without itemExtent',
(WidgetTester tester) async {
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: ListView(
addAutomaticKeepAlives: impliedMode,
addRepaintBoundaries: impliedMode,
addSemanticIndexes: false,
cacheExtent: 0.0,
children: generateList(
Container(
height: 12.3,
child: const Placeholder()), // about 50 widgets visible
impliedMode: impliedMode,
),
),
),
);
expect(find.byKey(const GlobalObjectKey<_LeafState>(3)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(30)), findsOneWidget);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(59), skipOffstage: false),
findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(60), skipOffstage: false),
findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(61), skipOffstage: false),
findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(90), skipOffstage: false),
findsNothing);
await tester.drag(find.byType(ListView),
const Offset(0.0, -300.0)); // about 25 widgets' worth
await tester.pump();
expect(
find.byKey(const GlobalObjectKey<_LeafState>(3), skipOffstage: false),
findsNothing);
expect(find.byKey(const GlobalObjectKey<_LeafState>(30)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(59)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(60)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(61)), findsOneWidget);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(90), skipOffstage: false),
findsNothing);
const GlobalObjectKey<_LeafState>(60).currentState.setKeepAlive(true);
await tester.drag(
find.byType(ListView), const Offset(0.0, 300.0)); // back to top
await tester.pump();
expect(find.byKey(const GlobalObjectKey<_LeafState>(3)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(30)), findsOneWidget);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(59), skipOffstage: false),
findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(60), skipOffstage: false),
findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(60)), findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(61), skipOffstage: false),
findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(90), skipOffstage: false),
findsNothing);
const GlobalObjectKey<_LeafState>(60).currentState.setKeepAlive(false);
await tester.pump();
expect(find.byKey(const GlobalObjectKey<_LeafState>(3)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(30)), findsOneWidget);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(59), skipOffstage: false),
findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(60), skipOffstage: false),
findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(61), skipOffstage: false),
findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(90), skipOffstage: false),
findsNothing);
});
testWidgets('AutomaticKeepAlive with GridView', (WidgetTester tester) async {
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: GridView.count(
addAutomaticKeepAlives: impliedMode,
addRepaintBoundaries: impliedMode,
addSemanticIndexes: false,
crossAxisCount: 2,
childAspectRatio: 400.0 / 24.6, // about 50 widgets visible
cacheExtent: 0.0,
children: generateList(
Container(child: const Placeholder()),
impliedMode: impliedMode,
),
),
),
);
expect(find.byKey(const GlobalObjectKey<_LeafState>(3)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(30)), findsOneWidget);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(59), skipOffstage: false),
findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(60), skipOffstage: false),
findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(61), skipOffstage: false),
findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(90), skipOffstage: false),
findsNothing);
await tester.drag(find.byType(GridView),
const Offset(0.0, -300.0)); // about 25 widgets' worth
await tester.pump();
expect(
find.byKey(const GlobalObjectKey<_LeafState>(3), skipOffstage: false),
findsNothing);
expect(find.byKey(const GlobalObjectKey<_LeafState>(30)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(59)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(60)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(61)), findsOneWidget);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(90), skipOffstage: false),
findsNothing);
const GlobalObjectKey<_LeafState>(60).currentState.setKeepAlive(true);
await tester.drag(
find.byType(GridView), const Offset(0.0, 300.0)); // back to top
await tester.pump();
expect(find.byKey(const GlobalObjectKey<_LeafState>(3)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(30)), findsOneWidget);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(59), skipOffstage: false),
findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(60), skipOffstage: false),
findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(60)), findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(61), skipOffstage: false),
findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(90), skipOffstage: false),
findsNothing);
const GlobalObjectKey<_LeafState>(60).currentState.setKeepAlive(false);
await tester.pump();
expect(find.byKey(const GlobalObjectKey<_LeafState>(3)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(30)), findsOneWidget);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(59), skipOffstage: false),
findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(60), skipOffstage: false),
findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(61), skipOffstage: false),
findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(90), skipOffstage: false),
findsNothing);
});
}
void main() {
group('Explicit automatic keep-alive', () {
tests(impliedMode: false);
});
group('Implied automatic keep-alive', () {
tests(impliedMode: true);
});
testWidgets('AutomaticKeepAlive double', (WidgetTester tester) async {
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: ListView(
addAutomaticKeepAlives: false,
addRepaintBoundaries: false,
addSemanticIndexes: false,
cacheExtent: 0.0,
children: <Widget>[
AutomaticKeepAlive(
child: Container(
height: 400.0,
child: Stack(children: const <Widget>[
Leaf(
key: GlobalObjectKey<_LeafState>(0),
child: Placeholder()),
Leaf(
key: GlobalObjectKey<_LeafState>(1),
child: Placeholder()),
]),
),
),
AutomaticKeepAlive(
child: Container(
key: const GlobalObjectKey<_LeafState>(2),
height: 400.0,
),
),
AutomaticKeepAlive(
child: Container(
key: const GlobalObjectKey<_LeafState>(3),
height: 400.0,
),
),
],
),
),
);
expect(find.byKey(const GlobalObjectKey<_LeafState>(0)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(1)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(2)), findsOneWidget);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(3), skipOffstage: false),
findsNothing);
await tester.drag(
find.byType(ListView), const Offset(0.0, -1000.0)); // move to bottom
await tester.pump();
expect(
find.byKey(const GlobalObjectKey<_LeafState>(0), skipOffstage: false),
findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(1), skipOffstage: false),
findsNothing);
expect(find.byKey(const GlobalObjectKey<_LeafState>(2)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(3)), findsOneWidget);
await tester.drag(
find.byType(ListView), const Offset(0.0, 1000.0)); // move to top
await tester.pump();
expect(find.byKey(const GlobalObjectKey<_LeafState>(0)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(1)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(2)), findsOneWidget);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(3), skipOffstage: false),
findsNothing);
const GlobalObjectKey<_LeafState>(0).currentState.setKeepAlive(true);
await tester.drag(
find.byType(ListView), const Offset(0.0, -1000.0)); // move to bottom
await tester.pump();
expect(
find.byKey(const GlobalObjectKey<_LeafState>(0), skipOffstage: false),
findsOneWidget);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(1), skipOffstage: false),
findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(0)), findsNothing);
expect(find.byKey(const GlobalObjectKey<_LeafState>(1)), findsNothing);
expect(find.byKey(const GlobalObjectKey<_LeafState>(2)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(3)), findsOneWidget);
const GlobalObjectKey<_LeafState>(1).currentState.setKeepAlive(true);
await tester.pump();
expect(
find.byKey(const GlobalObjectKey<_LeafState>(0), skipOffstage: false),
findsOneWidget);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(1), skipOffstage: false),
findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(0)), findsNothing);
expect(find.byKey(const GlobalObjectKey<_LeafState>(1)), findsNothing);
expect(find.byKey(const GlobalObjectKey<_LeafState>(2)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(3)), findsOneWidget);
const GlobalObjectKey<_LeafState>(0).currentState.setKeepAlive(false);
await tester.pump();
expect(
find.byKey(const GlobalObjectKey<_LeafState>(0), skipOffstage: false),
findsOneWidget);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(1), skipOffstage: false),
findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(0)), findsNothing);
expect(find.byKey(const GlobalObjectKey<_LeafState>(1)), findsNothing);
expect(find.byKey(const GlobalObjectKey<_LeafState>(2)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(3)), findsOneWidget);
const GlobalObjectKey<_LeafState>(1).currentState.setKeepAlive(false);
await tester.pump();
expect(
find.byKey(const GlobalObjectKey<_LeafState>(0), skipOffstage: false),
findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(1), skipOffstage: false),
findsNothing);
expect(find.byKey(const GlobalObjectKey<_LeafState>(2)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(3)), findsOneWidget);
});
testWidgets('AutomaticKeepAlive double 2', (WidgetTester tester) async {
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: ListView(
addAutomaticKeepAlives: false,
addRepaintBoundaries: false,
addSemanticIndexes: false,
cacheExtent: 0.0,
children: <Widget>[
AutomaticKeepAlive(
child: Container(
height: 400.0,
child: Stack(children: const <Widget>[
Leaf(
key: GlobalObjectKey<_LeafState>(0),
child: Placeholder()),
Leaf(
key: GlobalObjectKey<_LeafState>(1),
child: Placeholder()),
]),
),
),
AutomaticKeepAlive(
child: Container(
height: 400.0,
child: Stack(children: const <Widget>[
Leaf(
key: GlobalObjectKey<_LeafState>(2),
child: Placeholder()),
Leaf(
key: GlobalObjectKey<_LeafState>(3),
child: Placeholder()),
]),
),
),
AutomaticKeepAlive(
child: Container(
height: 400.0,
child: Stack(children: const <Widget>[
Leaf(
key: GlobalObjectKey<_LeafState>(4),
child: Placeholder()),
Leaf(
key: GlobalObjectKey<_LeafState>(5),
child: Placeholder()),
]),
),
),
],
),
),
);
expect(find.byKey(const GlobalObjectKey<_LeafState>(0)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(1)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(2)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(3)), findsOneWidget);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(4), skipOffstage: false),
findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(5), skipOffstage: false),
findsNothing);
const GlobalObjectKey<_LeafState>(0).currentState.setKeepAlive(true);
await tester.drag(
find.byType(ListView), const Offset(0.0, -1000.0)); // move to bottom
await tester.pump();
expect(
find.byKey(const GlobalObjectKey<_LeafState>(0), skipOffstage: false),
findsOneWidget);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(1), skipOffstage: false),
findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(1)), findsNothing);
expect(find.byKey(const GlobalObjectKey<_LeafState>(0)), findsNothing);
expect(find.byKey(const GlobalObjectKey<_LeafState>(2)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(3)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(4)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(5)), findsOneWidget);
await tester.pumpWidget(Directionality(
textDirection: TextDirection.ltr,
child: ListView(
addAutomaticKeepAlives: false,
addRepaintBoundaries: false,
addSemanticIndexes: false,
cacheExtent: 0.0,
children: <Widget>[
AutomaticKeepAlive(
child: Container(
height: 400.0,
child: Stack(children: const <Widget>[
Leaf(key: GlobalObjectKey<_LeafState>(1), child: Placeholder()),
]),
),
),
AutomaticKeepAlive(
child: Container(
height: 400.0,
child: Stack(children: const <Widget>[
Leaf(key: GlobalObjectKey<_LeafState>(2), child: Placeholder()),
Leaf(key: GlobalObjectKey<_LeafState>(3), child: Placeholder()),
]),
),
),
AutomaticKeepAlive(
child: Container(
height: 400.0,
child: Stack(children: const <Widget>[
Leaf(key: GlobalObjectKey<_LeafState>(4), child: Placeholder()),
Leaf(key: GlobalObjectKey<_LeafState>(5), child: Placeholder()),
Leaf(key: GlobalObjectKey<_LeafState>(0), child: Placeholder()),
]),
),
),
],
),
));
await tester
.pump(); // Sometimes AutomaticKeepAlive needs an extra pump to clean things up.
expect(
find.byKey(const GlobalObjectKey<_LeafState>(1), skipOffstage: false),
findsNothing);
expect(find.byKey(const GlobalObjectKey<_LeafState>(2)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(3)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(4)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(5)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(0)), findsOneWidget);
await tester.drag(
find.byType(ListView), const Offset(0.0, 1000.0)); // move to top
await tester.pump();
expect(find.byKey(const GlobalObjectKey<_LeafState>(1)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(2)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(3)), findsOneWidget);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(4), skipOffstage: false),
findsOneWidget);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(5), skipOffstage: false),
findsOneWidget);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(0), skipOffstage: false),
findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(4)), findsNothing);
expect(find.byKey(const GlobalObjectKey<_LeafState>(5)), findsNothing);
expect(find.byKey(const GlobalObjectKey<_LeafState>(0)), findsNothing);
const GlobalObjectKey<_LeafState>(0).currentState.setKeepAlive(false);
await tester.pump();
expect(find.byKey(const GlobalObjectKey<_LeafState>(1)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(2)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(3)), findsOneWidget);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(4), skipOffstage: false),
findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(5), skipOffstage: false),
findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(0), skipOffstage: false),
findsNothing);
await tester.pumpWidget(Directionality(
textDirection: TextDirection.ltr,
child: ListView(
addAutomaticKeepAlives: false,
addRepaintBoundaries: false,
addSemanticIndexes: false,
cacheExtent: 0.0,
children: <Widget>[
AutomaticKeepAlive(
child: Container(
height: 400.0,
child: Stack(children: const <Widget>[
Leaf(key: GlobalObjectKey<_LeafState>(1), child: Placeholder()),
Leaf(key: GlobalObjectKey<_LeafState>(2), child: Placeholder()),
]),
),
),
AutomaticKeepAlive(
child: Container(
height: 400.0,
child: Stack(children: const <Widget>[]),
),
),
AutomaticKeepAlive(
child: Container(
height: 400.0,
child: Stack(children: const <Widget>[
Leaf(key: GlobalObjectKey<_LeafState>(3), child: Placeholder()),
Leaf(key: GlobalObjectKey<_LeafState>(4), child: Placeholder()),
Leaf(key: GlobalObjectKey<_LeafState>(5), child: Placeholder()),
Leaf(key: GlobalObjectKey<_LeafState>(0), child: Placeholder()),
]),
),
),
],
),
));
await tester
.pump(); // Sometimes AutomaticKeepAlive needs an extra pump to clean things up.
expect(find.byKey(const GlobalObjectKey<_LeafState>(1)), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_LeafState>(2)), findsOneWidget);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(3), skipOffstage: false),
findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(4), skipOffstage: false),
findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(5), skipOffstage: false),
findsNothing);
expect(
find.byKey(const GlobalObjectKey<_LeafState>(0), skipOffstage: false),
findsNothing);
});
testWidgets('AutomaticKeepAlive with keepAlive set to true before initState',
(WidgetTester tester) async {
await tester.pumpWidget(Directionality(
textDirection: TextDirection.ltr,
child: ListView.builder(
addSemanticIndexes: false,
itemCount: 50,
itemBuilder: (BuildContext context, int index) {
if (index == 0) {
return const _AlwaysKeepAlive(
key: GlobalObjectKey<_AlwaysKeepAliveState>(0),
);
}
return Container(
height: 44.0,
child: Text('FooBar $index'),
);
},
),
));
expect(find.text('keep me alive'), findsOneWidget);
expect(find.text('FooBar 1'), findsOneWidget);
expect(find.text('FooBar 2'), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_AlwaysKeepAliveState>(0)),
findsOneWidget);
await tester.drag(
find.byType(ListView), const Offset(0.0, -1000.0)); // move to bottom
await tester.pump();
expect(
find.byKey(const GlobalObjectKey<_AlwaysKeepAliveState>(0),
skipOffstage: false),
findsOneWidget);
expect(find.text('keep me alive', skipOffstage: false), findsOneWidget);
expect(find.text('FooBar 1'), findsNothing);
expect(find.text('FooBar 2'), findsNothing);
});
testWidgets(
'AutomaticKeepAlive with keepAlive set to true before initState and widget goes out of scope',
(WidgetTester tester) async {
await tester.pumpWidget(Directionality(
textDirection: TextDirection.ltr,
child: ListView.builder(
addSemanticIndexes: false,
itemCount: 250,
itemBuilder: (BuildContext context, int index) {
if (index % 2 == 0) {
return _AlwaysKeepAlive(
key: GlobalObjectKey<_AlwaysKeepAliveState>(index),
);
}
return Container(
height: 44.0,
child: Text('FooBar $index'),
);
},
),
));
expect(find.text('keep me alive'), findsNWidgets(7));
expect(find.text('FooBar 1'), findsOneWidget);
expect(find.text('FooBar 3'), findsOneWidget);
expect(find.byKey(const GlobalObjectKey<_AlwaysKeepAliveState>(0)),
findsOneWidget);
final ScrollableState state = tester.state(find.byType(Scrollable));
final ScrollPosition position = state.position;
position.jumpTo(3025.0);
await tester.pump();
expect(
find.byKey(const GlobalObjectKey<_AlwaysKeepAliveState>(0),
skipOffstage: false),
findsOneWidget);
expect(find.text('keep me alive', skipOffstage: false), findsNWidgets(23));
expect(find.text('FooBar 1'), findsNothing);
expect(find.text('FooBar 3'), findsNothing);
expect(find.text('FooBar 73'), findsOneWidget);
});
testWidgets('AutomaticKeepAlive with SliverKeepAliveWidget',
(WidgetTester tester) async {
// We're just doing a basic test here to make sure that the functionality of
// RenderSliverWithKeepAliveMixin doesn't get regressed or deleted. As testing
// the full functionality would be cumbersome.
final RenderSliverMultiBoxAdaptorAlt alternate =
RenderSliverMultiBoxAdaptorAlt();
final RenderBox child = RenderBoxKeepAlive();
alternate.insert(child);
expect(alternate.children.length, 1);
});
}
class _AlwaysKeepAlive extends StatefulWidget {
const _AlwaysKeepAlive({Key key}) : super(key: key);
@override
State<StatefulWidget> createState() => _AlwaysKeepAliveState();
}
class _AlwaysKeepAliveState extends State<_AlwaysKeepAlive>
with AutomaticKeepAliveClientMixin<_AlwaysKeepAlive> {
@override
bool get wantKeepAlive => true;
@override
Widget build(BuildContext context) {
super.build(context);
return Container(
height: 48.0,
child: const Text('keep me alive'),
);
}
}
class RenderBoxKeepAlive extends RenderBox {
State<StatefulWidget> createState() => AlwaysKeepAliveRenderBoxState();
}
class AlwaysKeepAliveRenderBoxState extends State<_AlwaysKeepAlive>
with AutomaticKeepAliveClientMixin<_AlwaysKeepAlive> {
@override
bool get wantKeepAlive => true;
@override
Widget build(BuildContext context) {
super.build(context);
return Container(
height: 48.0,
child: const Text('keep me alive'),
);
}
}
abstract class KeepAliveParentDataMixinAlt implements KeepAliveParentDataMixin {
@override
bool keptAlive = false;
@override
bool keepAlive = false;
}
class RenderSliverMultiBoxAdaptorAlt extends RenderSliver
with
KeepAliveParentDataMixinAlt,
RenderSliverHelpers,
RenderSliverWithKeepAliveMixin {
RenderSliverMultiBoxAdaptorAlt({RenderSliverBoxChildManager childManager})
: _childManager = childManager;
@protected
RenderSliverBoxChildManager get childManager => _childManager;
final RenderSliverBoxChildManager _childManager;
final List<RenderBox> children = <RenderBox>[];
void insert(RenderBox child, {RenderBox after}) {
children.add(child);
}
@override
void visitChildren(RenderObjectVisitor visitor) {
children.forEach(visitor);
}
@override
void performLayout() {}
}
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