| // 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:io' show Platform; |
| |
| import 'package:flutter/foundation.dart'; |
| import 'package:flutter/widgets.dart'; |
| import 'package:flutter_test/flutter_test.dart'; |
| |
| class Leaf extends StatefulWidget { |
| const Leaf({ |
| super.key, |
| required this.child, |
| }); |
| final Widget child; |
| @override |
| State<Leaf> createState() => _LeafState(); |
| } |
| |
| class _LeafState extends State<Leaf> { |
| bool _keepAlive = false; |
| |
| void setKeepAlive(bool value) { |
| setState(() { _keepAlive = value; }); |
| } |
| |
| @override |
| Widget build(BuildContext context) { |
| return KeepAlive( |
| keepAlive: _keepAlive, |
| child: widget.child, |
| ); |
| } |
| } |
| |
| List<Widget> generateList(Widget child) { |
| return List<Widget>.generate( |
| 100, |
| (int index) => Leaf( |
| key: GlobalObjectKey<_LeafState>(index), |
| child: child, |
| ), |
| growable: false, |
| ); |
| } |
| |
| void main() { |
| testWidgets('KeepAlive with ListView with itemExtent', (WidgetTester tester) async { |
| await tester.pumpWidget( |
| Directionality( |
| textDirection: TextDirection.ltr, |
| child: ListView( |
| cacheExtent: 0.0, |
| addAutomaticKeepAlives: false, |
| addRepaintBoundaries: false, |
| addSemanticIndexes: false, |
| itemExtent: 12.3, // about 50 widgets visible |
| children: generateList(const Placeholder()), |
| ), |
| ), |
| ); |
| 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('KeepAlive with ListView without itemExtent', (WidgetTester tester) async { |
| await tester.pumpWidget( |
| Directionality( |
| textDirection: TextDirection.ltr, |
| child: ListView( |
| cacheExtent: 0.0, |
| addAutomaticKeepAlives: false, |
| addRepaintBoundaries: false, |
| addSemanticIndexes: false, |
| children: generateList(const SizedBox(height: 12.3, child: Placeholder())), // about 50 widgets visible |
| ), |
| ), |
| ); |
| 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('KeepAlive with GridView', (WidgetTester tester) async { |
| await tester.pumpWidget( |
| Directionality( |
| textDirection: TextDirection.ltr, |
| child: GridView.count( |
| cacheExtent: 0.0, |
| addAutomaticKeepAlives: false, |
| addRepaintBoundaries: false, |
| addSemanticIndexes: false, |
| crossAxisCount: 2, |
| childAspectRatio: 400.0 / 24.6, // about 50 widgets visible |
| children: generateList(const Placeholder()), |
| ), |
| ), |
| ); |
| 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); |
| }); |
| |
| testWidgets('KeepAlive render tree description', (WidgetTester tester) async { |
| await tester.pumpWidget( |
| Directionality( |
| textDirection: TextDirection.ltr, |
| child: ListView( |
| addAutomaticKeepAlives: false, |
| addRepaintBoundaries: false, |
| addSemanticIndexes: false, |
| itemExtent: 400.0, // 2 visible children |
| children: generateList(const Placeholder()), |
| ), |
| ), |
| ); |
| // The important lines below are the ones marked with "<----" |
| expect(tester.binding.renderView.toStringDeep(minLevel: DiagnosticLevel.info), equalsIgnoringHashCodes( |
| 'RenderView#00000\n' |
| ' │ debug mode enabled - ${Platform.operatingSystem}\n' |
| ' │ window size: Size(2400.0, 1800.0) (in physical pixels)\n' |
| ' │ device pixel ratio: 3.0 (physical pixels per logical pixel)\n' |
| ' │ configuration: Size(800.0, 600.0) at 3.0x (in logical pixels)\n' |
| ' │\n' |
| ' └─child: RenderRepaintBoundary#00000\n' |
| ' │ needs compositing\n' |
| ' │ parentData: <none>\n' |
| ' │ constraints: BoxConstraints(w=800.0, h=600.0)\n' |
| ' │ layer: OffsetLayer#00000\n' |
| ' │ size: Size(800.0, 600.0)\n' |
| ' │ metrics: 0.0% useful (1 bad vs 0 good)\n' |
| ' │ diagnosis: insufficient data to draw conclusion (less than five\n' |
| ' │ repaints)\n' |
| ' │\n' |
| ' └─child: RenderCustomPaint#00000\n' |
| ' │ needs compositing\n' |
| ' │ parentData: <none> (can use size)\n' |
| ' │ constraints: BoxConstraints(w=800.0, h=600.0)\n' |
| ' │ size: Size(800.0, 600.0)\n' |
| ' │ painter: null\n' |
| ' │ foregroundPainter:\n' |
| ' │ _GlowingOverscrollIndicatorPainter(_GlowController(color:\n' |
| ' │ Color(0xffffffff), axis: vertical), _GlowController(color:\n' |
| ' │ Color(0xffffffff), axis: vertical))\n' |
| ' │\n' |
| ' └─child: RenderRepaintBoundary#00000\n' |
| ' │ needs compositing\n' |
| ' │ parentData: <none> (can use size)\n' |
| ' │ constraints: BoxConstraints(w=800.0, h=600.0)\n' |
| ' │ layer: OffsetLayer#00000\n' |
| ' │ size: Size(800.0, 600.0)\n' |
| ' │ metrics: 0.0% useful (1 bad vs 0 good)\n' |
| ' │ diagnosis: insufficient data to draw conclusion (less than five\n' |
| ' │ repaints)\n' |
| ' │\n' |
| ' └─child: _RenderScrollSemantics#00000\n' |
| ' │ needs compositing\n' |
| ' │ parentData: <none> (can use size)\n' |
| ' │ constraints: BoxConstraints(w=800.0, h=600.0)\n' |
| ' │ semantics node: SemanticsNode#1\n' |
| ' │ semantic boundary\n' |
| ' │ size: Size(800.0, 600.0)\n' |
| ' │\n' |
| ' └─child: RenderPointerListener#00000\n' |
| ' │ needs compositing\n' |
| ' │ parentData: <none> (can use size)\n' |
| ' │ constraints: BoxConstraints(w=800.0, h=600.0)\n' |
| ' │ size: Size(800.0, 600.0)\n' |
| ' │ behavior: deferToChild\n' |
| ' │ listeners: signal\n' |
| ' │\n' |
| ' └─child: RenderSemanticsGestureHandler#00000\n' |
| ' │ needs compositing\n' |
| ' │ parentData: <none> (can use size)\n' |
| ' │ constraints: BoxConstraints(w=800.0, h=600.0)\n' |
| ' │ size: Size(800.0, 600.0)\n' |
| ' │ behavior: opaque\n' |
| ' │ gestures: vertical scroll\n' |
| ' │\n' |
| ' └─child: RenderPointerListener#00000\n' |
| ' │ needs compositing\n' |
| ' │ parentData: <none> (can use size)\n' |
| ' │ constraints: BoxConstraints(w=800.0, h=600.0)\n' |
| ' │ size: Size(800.0, 600.0)\n' |
| ' │ behavior: opaque\n' |
| ' │ listeners: down, panZoomStart\n' |
| ' │\n' |
| ' └─child: RenderSemanticsAnnotations#00000\n' |
| ' │ needs compositing\n' |
| ' │ parentData: <none> (can use size)\n' |
| ' │ constraints: BoxConstraints(w=800.0, h=600.0)\n' |
| ' │ size: Size(800.0, 600.0)\n' |
| ' │\n' |
| ' └─child: RenderIgnorePointer#00000\n' |
| ' │ needs compositing\n' |
| ' │ parentData: <none> (can use size)\n' |
| ' │ constraints: BoxConstraints(w=800.0, h=600.0)\n' |
| ' │ size: Size(800.0, 600.0)\n' |
| ' │ ignoring: false\n' |
| ' │ ignoringSemantics: false\n' |
| ' │\n' |
| ' └─child: RenderViewport#00000\n' |
| ' │ needs compositing\n' |
| ' │ parentData: <none> (can use size)\n' |
| ' │ constraints: BoxConstraints(w=800.0, h=600.0)\n' |
| ' │ layer: OffsetLayer#00000\n' |
| ' │ size: Size(800.0, 600.0)\n' |
| ' │ axisDirection: down\n' |
| ' │ crossAxisDirection: right\n' |
| ' │ offset: ScrollPositionWithSingleContext#00000(offset: 0.0, range:\n' |
| ' │ 0.0..39400.0, viewport: 600.0, ScrollableState,\n' |
| ' │ AlwaysScrollableScrollPhysics -> ClampingScrollPhysics ->\n' |
| ' │ RangeMaintainingScrollPhysics, IdleScrollActivity#00000,\n' |
| ' │ ScrollDirection.idle)\n' |
| ' │ anchor: 0.0\n' |
| ' │\n' |
| ' └─center child: RenderSliverFixedExtentList#00000 relayoutBoundary=up1\n' |
| ' │ parentData: paintOffset=Offset(0.0, 0.0) (can use size)\n' |
| ' │ constraints: SliverConstraints(AxisDirection.down,\n' |
| ' │ GrowthDirection.forward, ScrollDirection.idle, scrollOffset:\n' |
| ' │ 0.0, remainingPaintExtent: 600.0, crossAxisExtent: 800.0,\n' |
| ' │ crossAxisDirection: AxisDirection.right,\n' |
| ' │ viewportMainAxisExtent: 600.0, remainingCacheExtent: 850.0,\n' |
| ' │ cacheOrigin: 0.0)\n' |
| ' │ geometry: SliverGeometry(scrollExtent: 40000.0, paintExtent:\n' |
| ' │ 600.0, maxPaintExtent: 40000.0, hasVisualOverflow: true,\n' |
| ' │ cacheExtent: 850.0)\n' |
| ' │ currently live children: 0 to 2\n' |
| ' │\n' |
| ' ├─child with index 0: RenderLimitedBox#00000\n' |
| ' │ │ parentData: index=0; layoutOffset=0.0\n' |
| ' │ │ constraints: BoxConstraints(w=800.0, h=400.0)\n' |
| ' │ │ size: Size(800.0, 400.0)\n' |
| ' │ │ maxWidth: 400.0\n' |
| ' │ │ maxHeight: 400.0\n' |
| ' │ │\n' |
| ' │ └─child: RenderCustomPaint#00000\n' |
| ' │ parentData: <none> (can use size)\n' |
| ' │ constraints: BoxConstraints(w=800.0, h=400.0)\n' |
| ' │ size: Size(800.0, 400.0)\n' |
| ' │ painter: _PlaceholderPainter#00000()\n' |
| ' │ preferredSize: Size(Infinity, Infinity)\n' |
| ' │\n' |
| ' ├─child with index 1: RenderLimitedBox#00000\n' // <----- no dashed line starts here |
| ' │ │ parentData: index=1; layoutOffset=400.0\n' |
| ' │ │ constraints: BoxConstraints(w=800.0, h=400.0)\n' |
| ' │ │ size: Size(800.0, 400.0)\n' |
| ' │ │ maxWidth: 400.0\n' |
| ' │ │ maxHeight: 400.0\n' |
| ' │ │\n' |
| ' │ └─child: RenderCustomPaint#00000\n' |
| ' │ parentData: <none> (can use size)\n' |
| ' │ constraints: BoxConstraints(w=800.0, h=400.0)\n' |
| ' │ size: Size(800.0, 400.0)\n' |
| ' │ painter: _PlaceholderPainter#00000()\n' |
| ' │ preferredSize: Size(Infinity, Infinity)\n' |
| ' │\n' |
| ' └─child with index 2: RenderLimitedBox#00000 NEEDS-PAINT\n' |
| ' │ parentData: index=2; layoutOffset=800.0\n' |
| ' │ constraints: BoxConstraints(w=800.0, h=400.0)\n' |
| ' │ size: Size(800.0, 400.0)\n' |
| ' │ maxWidth: 400.0\n' |
| ' │ maxHeight: 400.0\n' |
| ' │\n' |
| ' └─child: RenderCustomPaint#00000 NEEDS-PAINT\n' |
| ' parentData: <none> (can use size)\n' |
| ' constraints: BoxConstraints(w=800.0, h=400.0)\n' |
| ' size: Size(800.0, 400.0)\n' |
| ' painter: _PlaceholderPainter#00000()\n' |
| ' preferredSize: Size(Infinity, Infinity)\n', |
| )); |
| const GlobalObjectKey<_LeafState>(0).currentState!.setKeepAlive(true); |
| await tester.drag(find.byType(ListView), const Offset(0.0, -1000.0)); |
| await tester.pump(); |
| const GlobalObjectKey<_LeafState>(3).currentState!.setKeepAlive(true); |
| await tester.drag(find.byType(ListView), const Offset(0.0, -1000.0)); |
| await tester.pump(); |
| expect(tester.binding.renderView.toStringDeep(minLevel: DiagnosticLevel.info), equalsIgnoringHashCodes( |
| 'RenderView#00000\n' |
| ' │ debug mode enabled - ${Platform.operatingSystem}\n' |
| ' │ window size: Size(2400.0, 1800.0) (in physical pixels)\n' |
| ' │ device pixel ratio: 3.0 (physical pixels per logical pixel)\n' |
| ' │ configuration: Size(800.0, 600.0) at 3.0x (in logical pixels)\n' |
| ' │\n' |
| ' └─child: RenderRepaintBoundary#00000\n' |
| ' │ needs compositing\n' |
| ' │ parentData: <none>\n' |
| ' │ constraints: BoxConstraints(w=800.0, h=600.0)\n' |
| ' │ layer: OffsetLayer#00000\n' |
| ' │ size: Size(800.0, 600.0)\n' |
| ' │ metrics: 0.0% useful (1 bad vs 0 good)\n' |
| ' │ diagnosis: insufficient data to draw conclusion (less than five\n' |
| ' │ repaints)\n' |
| ' │\n' |
| ' └─child: RenderCustomPaint#00000\n' |
| ' │ needs compositing\n' |
| ' │ parentData: <none> (can use size)\n' |
| ' │ constraints: BoxConstraints(w=800.0, h=600.0)\n' |
| ' │ size: Size(800.0, 600.0)\n' |
| ' │ painter: null\n' |
| ' │ foregroundPainter:\n' |
| ' │ _GlowingOverscrollIndicatorPainter(_GlowController(color:\n' |
| ' │ Color(0xffffffff), axis: vertical), _GlowController(color:\n' |
| ' │ Color(0xffffffff), axis: vertical))\n' |
| ' │\n' |
| ' └─child: RenderRepaintBoundary#00000\n' |
| ' │ needs compositing\n' |
| ' │ parentData: <none> (can use size)\n' |
| ' │ constraints: BoxConstraints(w=800.0, h=600.0)\n' |
| ' │ layer: OffsetLayer#00000\n' |
| ' │ size: Size(800.0, 600.0)\n' |
| ' │ metrics: 0.0% useful (1 bad vs 0 good)\n' |
| ' │ diagnosis: insufficient data to draw conclusion (less than five\n' |
| ' │ repaints)\n' |
| ' │\n' |
| ' └─child: _RenderScrollSemantics#00000\n' |
| ' │ needs compositing\n' |
| ' │ parentData: <none> (can use size)\n' |
| ' │ constraints: BoxConstraints(w=800.0, h=600.0)\n' |
| ' │ semantics node: SemanticsNode#1\n' |
| ' │ semantic boundary\n' |
| ' │ size: Size(800.0, 600.0)\n' |
| ' │\n' |
| ' └─child: RenderPointerListener#00000\n' |
| ' │ needs compositing\n' |
| ' │ parentData: <none> (can use size)\n' |
| ' │ constraints: BoxConstraints(w=800.0, h=600.0)\n' |
| ' │ size: Size(800.0, 600.0)\n' |
| ' │ behavior: deferToChild\n' |
| ' │ listeners: signal\n' |
| ' │\n' |
| ' └─child: RenderSemanticsGestureHandler#00000\n' |
| ' │ needs compositing\n' |
| ' │ parentData: <none> (can use size)\n' |
| ' │ constraints: BoxConstraints(w=800.0, h=600.0)\n' |
| ' │ size: Size(800.0, 600.0)\n' |
| ' │ behavior: opaque\n' |
| ' │ gestures: vertical scroll\n' |
| ' │\n' |
| ' └─child: RenderPointerListener#00000\n' |
| ' │ needs compositing\n' |
| ' │ parentData: <none> (can use size)\n' |
| ' │ constraints: BoxConstraints(w=800.0, h=600.0)\n' |
| ' │ size: Size(800.0, 600.0)\n' |
| ' │ behavior: opaque\n' |
| ' │ listeners: down, panZoomStart\n' |
| ' │\n' |
| ' └─child: RenderSemanticsAnnotations#00000\n' |
| ' │ needs compositing\n' |
| ' │ parentData: <none> (can use size)\n' |
| ' │ constraints: BoxConstraints(w=800.0, h=600.0)\n' |
| ' │ size: Size(800.0, 600.0)\n' |
| ' │\n' |
| ' └─child: RenderIgnorePointer#00000\n' |
| ' │ needs compositing\n' |
| ' │ parentData: <none> (can use size)\n' |
| ' │ constraints: BoxConstraints(w=800.0, h=600.0)\n' |
| ' │ size: Size(800.0, 600.0)\n' |
| ' │ ignoring: false\n' |
| ' │ ignoringSemantics: false\n' |
| ' │\n' |
| ' └─child: RenderViewport#00000\n' |
| ' │ needs compositing\n' |
| ' │ parentData: <none> (can use size)\n' |
| ' │ constraints: BoxConstraints(w=800.0, h=600.0)\n' |
| ' │ layer: OffsetLayer#00000\n' |
| ' │ size: Size(800.0, 600.0)\n' |
| ' │ axisDirection: down\n' |
| ' │ crossAxisDirection: right\n' |
| ' │ offset: ScrollPositionWithSingleContext#00000(offset: 2000.0,\n' |
| ' │ range: 0.0..39400.0, viewport: 600.0, ScrollableState,\n' |
| ' │ AlwaysScrollableScrollPhysics -> ClampingScrollPhysics ->\n' |
| ' │ RangeMaintainingScrollPhysics, IdleScrollActivity#00000,\n' |
| ' │ ScrollDirection.idle)\n' |
| ' │ anchor: 0.0\n' |
| ' │\n' |
| ' └─center child: RenderSliverFixedExtentList#00000 relayoutBoundary=up1\n' |
| ' │ parentData: paintOffset=Offset(0.0, 0.0) (can use size)\n' |
| ' │ constraints: SliverConstraints(AxisDirection.down,\n' |
| ' │ GrowthDirection.forward, ScrollDirection.idle, scrollOffset:\n' |
| ' │ 2000.0, remainingPaintExtent: 600.0, crossAxisExtent: 800.0,\n' |
| ' │ crossAxisDirection: AxisDirection.right,\n' |
| ' │ viewportMainAxisExtent: 600.0, remainingCacheExtent: 1100.0,\n' |
| ' │ cacheOrigin: -250.0)\n' |
| ' │ geometry: SliverGeometry(scrollExtent: 40000.0, paintExtent:\n' |
| ' │ 600.0, maxPaintExtent: 40000.0, hasVisualOverflow: true,\n' |
| ' │ cacheExtent: 1100.0)\n' |
| ' │ currently live children: 4 to 7\n' |
| ' │\n' |
| ' ├─child with index 4: RenderLimitedBox#00000 NEEDS-PAINT\n' |
| ' │ │ parentData: index=4; layoutOffset=1600.0\n' |
| ' │ │ constraints: BoxConstraints(w=800.0, h=400.0)\n' |
| ' │ │ size: Size(800.0, 400.0)\n' |
| ' │ │ maxWidth: 400.0\n' |
| ' │ │ maxHeight: 400.0\n' |
| ' │ │\n' |
| ' │ └─child: RenderCustomPaint#00000 NEEDS-PAINT\n' |
| ' │ parentData: <none> (can use size)\n' |
| ' │ constraints: BoxConstraints(w=800.0, h=400.0)\n' |
| ' │ size: Size(800.0, 400.0)\n' |
| ' │ painter: _PlaceholderPainter#00000()\n' |
| ' │ preferredSize: Size(Infinity, Infinity)\n' |
| ' │\n' |
| ' ├─child with index 5: RenderLimitedBox#00000\n' // <----- this is index 5, not 0 |
| ' │ │ parentData: index=5; layoutOffset=2000.0\n' |
| ' │ │ constraints: BoxConstraints(w=800.0, h=400.0)\n' |
| ' │ │ size: Size(800.0, 400.0)\n' |
| ' │ │ maxWidth: 400.0\n' |
| ' │ │ maxHeight: 400.0\n' |
| ' │ │\n' |
| ' │ └─child: RenderCustomPaint#00000\n' |
| ' │ parentData: <none> (can use size)\n' |
| ' │ constraints: BoxConstraints(w=800.0, h=400.0)\n' |
| ' │ size: Size(800.0, 400.0)\n' |
| ' │ painter: _PlaceholderPainter#00000()\n' |
| ' │ preferredSize: Size(Infinity, Infinity)\n' |
| ' │\n' |
| ' ├─child with index 6: RenderLimitedBox#00000\n' |
| ' │ │ parentData: index=6; layoutOffset=2400.0\n' |
| ' │ │ constraints: BoxConstraints(w=800.0, h=400.0)\n' |
| ' │ │ size: Size(800.0, 400.0)\n' |
| ' │ │ maxWidth: 400.0\n' |
| ' │ │ maxHeight: 400.0\n' |
| ' │ │\n' |
| ' │ └─child: RenderCustomPaint#00000\n' |
| ' │ parentData: <none> (can use size)\n' |
| ' │ constraints: BoxConstraints(w=800.0, h=400.0)\n' |
| ' │ size: Size(800.0, 400.0)\n' |
| ' │ painter: _PlaceholderPainter#00000()\n' |
| ' │ preferredSize: Size(Infinity, Infinity)\n' |
| ' │\n' |
| ' ├─child with index 7: RenderLimitedBox#00000 NEEDS-PAINT\n' |
| ' ╎ │ parentData: index=7; layoutOffset=2800.0\n' |
| ' ╎ │ constraints: BoxConstraints(w=800.0, h=400.0)\n' |
| ' ╎ │ size: Size(800.0, 400.0)\n' |
| ' ╎ │ maxWidth: 400.0\n' |
| ' ╎ │ maxHeight: 400.0\n' |
| ' ╎ │\n' |
| ' ╎ └─child: RenderCustomPaint#00000 NEEDS-PAINT\n' |
| ' ╎ parentData: <none> (can use size)\n' |
| ' ╎ constraints: BoxConstraints(w=800.0, h=400.0)\n' |
| ' ╎ size: Size(800.0, 400.0)\n' |
| ' ╎ painter: _PlaceholderPainter#00000()\n' |
| ' ╎ preferredSize: Size(Infinity, Infinity)\n' |
| ' ╎\n' |
| ' ╎╌child with index 0 (kept alive but not laid out): RenderLimitedBox#00000\n' // <----- this one is index 0 and is marked as being kept alive but not laid out |
| ' ╎ │ parentData: index=0; keepAlive; layoutOffset=0.0\n' |
| ' ╎ │ constraints: BoxConstraints(w=800.0, h=400.0)\n' |
| ' ╎ │ size: Size(800.0, 400.0)\n' |
| ' ╎ │ maxWidth: 400.0\n' |
| ' ╎ │ maxHeight: 400.0\n' |
| ' ╎ │\n' |
| ' ╎ └─child: RenderCustomPaint#00000\n' |
| ' ╎ parentData: <none> (can use size)\n' |
| ' ╎ constraints: BoxConstraints(w=800.0, h=400.0)\n' |
| ' ╎ size: Size(800.0, 400.0)\n' |
| ' ╎ painter: _PlaceholderPainter#00000()\n' |
| ' ╎ preferredSize: Size(Infinity, Infinity)\n' |
| ' ╎\n' // <----- dashed line ends here |
| ' └╌child with index 3 (kept alive but not laid out): RenderLimitedBox#00000\n' |
| ' │ parentData: index=3; keepAlive; layoutOffset=1200.0\n' |
| ' │ constraints: BoxConstraints(w=800.0, h=400.0)\n' |
| ' │ size: Size(800.0, 400.0)\n' |
| ' │ maxWidth: 400.0\n' |
| ' │ maxHeight: 400.0\n' |
| ' │\n' |
| ' └─child: RenderCustomPaint#00000\n' |
| ' parentData: <none> (can use size)\n' |
| ' constraints: BoxConstraints(w=800.0, h=400.0)\n' |
| ' size: Size(800.0, 400.0)\n' |
| ' painter: _PlaceholderPainter#00000()\n' |
| ' preferredSize: Size(Infinity, Infinity)\n', |
| )); |
| }, skip: kIsWeb); // https://github.com/flutter/flutter/issues/87876 |
| |
| } |
