662 lines
30 KiB
Dart
662 lines
30 KiB
Dart
// 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/gestures.dart' show DragStartBehavior;
|
|
import 'package:flutter/rendering.dart';
|
|
import 'package:flutter/widgets.dart';
|
|
import 'package:flutter_test/flutter_test.dart';
|
|
|
|
class Leaf extends StatefulWidget {
|
|
const Leaf({ required Key key, required this.child }) : super(key: key);
|
|
final Widget child;
|
|
@override
|
|
State<Leaf> 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(
|
|
const SizedBox(height: 12.3, child: 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(
|
|
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: const <Widget>[
|
|
AutomaticKeepAlive(
|
|
child: SizedBox(
|
|
height: 400.0,
|
|
child: Stack(children: <Widget>[
|
|
Leaf(key: GlobalObjectKey<_LeafState>(0), child: Placeholder()),
|
|
Leaf(key: GlobalObjectKey<_LeafState>(1), child: Placeholder()),
|
|
]),
|
|
),
|
|
),
|
|
AutomaticKeepAlive(
|
|
child: SizedBox(
|
|
key: GlobalObjectKey<_LeafState>(2),
|
|
height: 400.0,
|
|
),
|
|
),
|
|
AutomaticKeepAlive(
|
|
child: SizedBox(
|
|
key: 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: const <Widget>[
|
|
AutomaticKeepAlive(
|
|
child: SizedBox(
|
|
height: 400.0,
|
|
child: Stack(children: <Widget>[
|
|
Leaf(key: GlobalObjectKey<_LeafState>(0), child: Placeholder()),
|
|
Leaf(key: GlobalObjectKey<_LeafState>(1), child: Placeholder()),
|
|
]),
|
|
),
|
|
),
|
|
AutomaticKeepAlive(
|
|
child: SizedBox(
|
|
height: 400.0,
|
|
child: Stack(children: <Widget>[
|
|
Leaf(key: GlobalObjectKey<_LeafState>(2), child: Placeholder()),
|
|
Leaf(key: GlobalObjectKey<_LeafState>(3), child: Placeholder()),
|
|
]),
|
|
),
|
|
),
|
|
AutomaticKeepAlive(
|
|
child: SizedBox(
|
|
height: 400.0,
|
|
child: Stack(children: <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: const <Widget>[
|
|
AutomaticKeepAlive(
|
|
child: SizedBox(
|
|
height: 400.0,
|
|
child: Stack(children: <Widget>[
|
|
Leaf(key: GlobalObjectKey<_LeafState>(1), child: Placeholder()),
|
|
]),
|
|
),
|
|
),
|
|
AutomaticKeepAlive(
|
|
child: SizedBox(
|
|
height: 400.0,
|
|
child: Stack(children: <Widget>[
|
|
Leaf(key: GlobalObjectKey<_LeafState>(2), child: Placeholder()),
|
|
Leaf(key: GlobalObjectKey<_LeafState>(3), child: Placeholder()),
|
|
]),
|
|
),
|
|
),
|
|
AutomaticKeepAlive(
|
|
child: SizedBox(
|
|
height: 400.0,
|
|
child: Stack(children: <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: const <Widget>[
|
|
AutomaticKeepAlive(
|
|
child: SizedBox(
|
|
height: 400.0,
|
|
child: Stack(children: <Widget>[
|
|
Leaf(key: GlobalObjectKey<_LeafState>(1), child: Placeholder()),
|
|
Leaf(key: GlobalObjectKey<_LeafState>(2), child: Placeholder()),
|
|
]),
|
|
),
|
|
),
|
|
AutomaticKeepAlive(
|
|
child: SizedBox(
|
|
height: 400.0,
|
|
child: Stack(),
|
|
),
|
|
),
|
|
AutomaticKeepAlive(
|
|
child: SizedBox(
|
|
height: 400.0,
|
|
child: Stack(children: <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(
|
|
dragStartBehavior: DragStartBehavior.down,
|
|
addSemanticIndexes: false,
|
|
itemCount: 50,
|
|
itemBuilder: (BuildContext context, int index) {
|
|
if (index == 0) {
|
|
return const _AlwaysKeepAlive(
|
|
key: GlobalObjectKey<_AlwaysKeepAliveState>(0),
|
|
);
|
|
}
|
|
return SizedBox(
|
|
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.isEven) {
|
|
return _AlwaysKeepAlive(
|
|
key: GlobalObjectKey<_AlwaysKeepAliveState>(index),
|
|
);
|
|
}
|
|
return SizedBox(
|
|
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);
|
|
});
|
|
|
|
testWidgets('Keep alive Listenable has its listener removed once called', (WidgetTester tester) async {
|
|
final LeakCheckerHandle handle = LeakCheckerHandle();
|
|
await tester.pumpWidget(Directionality(
|
|
textDirection: TextDirection.ltr,
|
|
child: ListView.builder(
|
|
itemCount: 1,
|
|
itemBuilder: (BuildContext context, int index) {
|
|
return const KeepAliveListenableLeakChecker(key: GlobalObjectKey<_KeepAliveListenableLeakCheckerState>(0));
|
|
},
|
|
),
|
|
));
|
|
final _KeepAliveListenableLeakCheckerState state = const GlobalObjectKey<_KeepAliveListenableLeakCheckerState>(0).currentState!;
|
|
|
|
expect(handle.hasListeners, false);
|
|
state.dispatch(handle);
|
|
expect(handle.hasListeners, true);
|
|
handle.notifyListeners();
|
|
expect(handle.hasListeners, false);
|
|
});
|
|
}
|
|
|
|
class _AlwaysKeepAlive extends StatefulWidget {
|
|
const _AlwaysKeepAlive({ required 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 const SizedBox(
|
|
height: 48.0,
|
|
child: Text('keep me alive'),
|
|
);
|
|
}
|
|
}
|
|
|
|
class RenderBoxKeepAlive extends RenderBox { }
|
|
|
|
mixin KeepAliveParentDataMixinAlt implements KeepAliveParentDataMixin {
|
|
@override
|
|
bool keptAlive = false;
|
|
|
|
@override
|
|
bool keepAlive = false;
|
|
}
|
|
|
|
class RenderSliverMultiBoxAdaptorAlt extends RenderSliver with
|
|
KeepAliveParentDataMixinAlt,
|
|
RenderSliverHelpers,
|
|
RenderSliverWithKeepAliveMixin {
|
|
|
|
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() { }
|
|
}
|
|
|
|
class LeakCheckerHandle with ChangeNotifier {
|
|
LeakCheckerHandle() {
|
|
if (kFlutterMemoryAllocationsEnabled) {
|
|
maybeDispatchObjectCreation();
|
|
}
|
|
}
|
|
|
|
@override
|
|
bool get hasListeners => super.hasListeners;
|
|
}
|
|
|
|
class KeepAliveListenableLeakChecker extends StatefulWidget {
|
|
const KeepAliveListenableLeakChecker({super.key});
|
|
|
|
@override
|
|
State<KeepAliveListenableLeakChecker> createState() => _KeepAliveListenableLeakCheckerState();
|
|
}
|
|
|
|
class _KeepAliveListenableLeakCheckerState extends State<KeepAliveListenableLeakChecker> {
|
|
void dispatch(Listenable handle) {
|
|
KeepAliveNotification(handle).dispatch(context);
|
|
}
|
|
|
|
@override
|
|
Widget build(BuildContext context) {
|
|
return const Placeholder();
|
|
}
|
|
}
|