Calling MultiChildLayoutDelegate.hasChild from MultiChildLayoutDelegate.getSize throws an exception because _idToChild is null #115898

crazy-rodney · 2022-11-23T06:32:26Z

Steps to Reproduce

Execute flutter run on the code sample
Exception is thrown

Expected results: Calling hasChild in getSize returns normally.

Actual results: Calling hasChild in getSize throws an exception.

Code sample

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  const MyHomePage({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: CustomMultiChildLayout(
        delegate: _MultiChildLayoutDelegate(),
        children: [
          LayoutId(
            id: 0,
            child: const SizedBox(
              width: 50,
              height: 50,
            ),
          ),
          LayoutId(
            id: 1,
            child: const SizedBox(
              width: 50,
              height: 50,
            ),
          ),
          LayoutId(
            id: 2,
            child: const SizedBox(
              width: 50,
              height: 50,
            ),
          )
        ],
      ),
    );
  }
}

class _MultiChildLayoutDelegate extends MultiChildLayoutDelegate {
  _MultiChildLayoutDelegate();

  @override
  Size getSize(BoxConstraints constraints) {
    hasChild(0);
    return Size(constraints.maxWidth, constraints.maxHeight);
  }

  @override
  void performLayout(Size size) {}

  @override
  bool shouldRelayout(covariant MultiChildLayoutDelegate oldDelegate) {
    return true;
  }
}

Logs

           ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
           The following _CastError was thrown during performLayout():
           Null check operator used on a null value

           The relevant error-causing widget was:
             CustomMultiChildLayout
             CustomMultiChildLayout:file:///Users/max/AndroidStudioProjects/layout_bug_example/lib/main.dart:28:13

           When the exception was thrown, this was the stack:
           #0      MultiChildLayoutDelegate.hasChild (package:flutter/src/rendering/custom_layout.dart:133:46)
           #1      _MultiChildLayoutDelegate.getSize (package:layout_bug_example/main.dart:63:5)
           #2      RenderCustomMultiChildLayoutBox._getSize (package:flutter/src/rendering/custom_layout.dart:359:44)
           #3      RenderCustomMultiChildLayoutBox.performLayout (package:flutter/src/rendering/custom_layout.dart:409:12)
           #4      RenderObject.layout (package:flutter/src/rendering/object.dart:2135:7)
           #5      RenderBox.layout (package:flutter/src/rendering/box.dart:2418:11)
           #6      MultiChildLayoutDelegate.layoutChild (package:flutter/src/rendering/custom_layout.dart:171:12)
           #7      _ScaffoldLayout.performLayout (package:flutter/src/material/scaffold.dart:1055:7)
           #8      MultiChildLayoutDelegate._callPerformLayout (package:flutter/src/rendering/custom_layout.dart:240:7)
           #9      RenderCustomMultiChildLayoutBox.performLayout (package:flutter/src/rendering/custom_layout.dart:410:14)
           #10     RenderObject.layout (package:flutter/src/rendering/object.dart:2135:7)
.....
       The following RenderObject was being processed when the exception was fired: RenderCustomMultiChildLayoutBox#21a29 relayoutBoundary=up1 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE:
             creator: CustomMultiChildLayout ← KeyedSubtree-[GlobalKey#19ad8] ← _BodyBuilder ← MediaQuery ←
               LayoutId-[<_ScaffoldSlot.body>] ← CustomMultiChildLayout ← _ActionsMarker ← Actions ←
               AnimatedBuilder ← DefaultTextStyle ← AnimatedDefaultTextStyle ← _InkFeatures-[GlobalKey#ce20a ink
               renderer] ← ⋯
             parentData: offset=Offset(0.0, 0.0); id=_ScaffoldSlot.body (can use size)
             constraints: BoxConstraints(0.0<=w<=411.4, 0.0<=h<=843.4)
             size: MISSING
           This RenderObject had the following descendants (showing up to depth 5):
               child 1: RenderConstrainedBox#b765d NEEDS-LAYOUT NEEDS-PAINT
               child 2: RenderConstrainedBox#938bd NEEDS-LAYOUT NEEDS-PAINT
               child 3: RenderConstrainedBox#93540 NEEDS-LAYOUT NEEDS-PAINT
           ════════════════════════════════════════════════════════════════════════════════════════════════════

Running "flutter pub get" in layout_bug_example...                 253ms
Analyzing layout_bug_example...                                         
No issues found! (ran in 3.1s)

[✓] Flutter (Channel stable, 3.3.8, on macOS 13.0.1 22A400 darwin-arm, locale en-DE)
    • Flutter version 3.3.8 on channel stable at /Users/max/fvm/versions/3.3.8
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 52b3dc25f6 (2 weeks ago), 2022-11-09 12:09:26 +0800
    • Engine revision 857bd6b74c
    • Dart version 2.18.4
    • DevTools version 2.15.0

[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.0)
    • Android SDK at /Users/max/Library/Android/sdk
    • Platform android-33, build-tools 33.0.0
    • Java binary at: /Users/max/Library/Application Support/JetBrains/Toolbox/apps/AndroidStudio/ch-0/213.7172.25.2113.9123335/Android Studio.app/Contents/jre/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.13+0-b1751.21-8125866)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 14.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 14B47b
    • CocoaPods version 1.11.3

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2021.3)
    • Android Studio at /Users/max/Library/Application Support/JetBrains/Toolbox/apps/AndroidStudio/ch-0/213.7172.25.2113.9014738/Android Studio.app/Contents
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      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
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[✓] Android Studio (version 2021.3)
    • Android Studio at /Users/max/Library/Application Support/JetBrains/Toolbox/apps/AndroidStudio/ch-0/213.7172.25.2113.9123335/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
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    • Java version OpenJDK Runtime Environment (build 11.0.13+0-b1751.21-8125866)

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    • IntelliJ at /Users/max/Library/Application Support/JetBrains/Toolbox/apps/IDEA-C/ch-0/222.4345.14/IntelliJ IDEA CE.app
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[✓] Connected device (4 available)
    • Pixel 7 (mobile)            • 29021FDH2004TJ • android-arm64  • Android 13 (API 33)
    • sdk gphone64 arm64 (mobile) • emulator-5554  • android-arm64  • Android 12 (API 31) (emulator)
    • macOS (desktop)             • macos          • darwin-arm64   • macOS 13.0.1 22A400 darwin-arm
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• No issues found!

Not sure if I am not supposed to call hasChild during getSize. But since the documentation clearly states that this may be done

/// True if a non-null LayoutChild was provided for the specified id.
///
/// Call this from the [performLayout] or [getSize] methods to
/// determine which children are available, if the child list might
/// vary.
bool hasChild(Object childId) => _idToChild![childId] != null;

I assume this is either an issue with the documentation or with the framework.

The text was updated successfully, but these errors were encountered:

exaby73 · 2022-11-23T11:41:28Z

Triage report

I can reproduce this issue on Master (3.6.0-7.0.pre.35)

Code Sample (Same as OP)

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  const MyHomePage({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: CustomMultiChildLayout(
        delegate: _MultiChildLayoutDelegate(),
        children: [
          LayoutId(
            id: 0,
            child: const SizedBox(
              width: 50,
              height: 50,
            ),
          ),
          LayoutId(
            id: 1,
            child: const SizedBox(
              width: 50,
              height: 50,
            ),
          ),
          LayoutId(
            id: 2,
            child: const SizedBox(
              width: 50,
              height: 50,
            ),
          )
        ],
      ),
    );
  }
}

class _MultiChildLayoutDelegate extends MultiChildLayoutDelegate {
  _MultiChildLayoutDelegate();

  @override
  Size getSize(BoxConstraints constraints) {
    hasChild(0);
    return Size(constraints.maxWidth, constraints.maxHeight);
  }

  @override
  void performLayout(Size size) {}

  @override
  bool shouldRelayout(covariant MultiChildLayoutDelegate oldDelegate) {
    return true;
  }
}

Logs

══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
The following _CastError was thrown during performLayout():
Null check operator used on a null value

The relevant error-causing widget was:
  CustomMultiChildLayout
  CustomMultiChildLayout:file:///home/exabyt3/dev/nevercode/issue_115898/lib/main.dart:28:13

When the exception was thrown, this was the stack:
#0      MultiChildLayoutDelegate.hasChild (package:flutter/src/rendering/custom_layout.dart:133:46)
#1      _MultiChildLayoutDelegate.getSize (package:issue_115898/main.dart:63:5)
#2      RenderCustomMultiChildLayoutBox._getSize (package:flutter/src/rendering/custom_layout.dart:359:44)
#3      RenderCustomMultiChildLayoutBox.performLayout (package:flutter/src/rendering/custom_layout.dart:409:12)
#4      RenderObject.layout (package:flutter/src/rendering/object.dart:2189:7)
#5      RenderBox.layout (package:flutter/src/rendering/box.dart:2430:11)
#6      MultiChildLayoutDelegate.layoutChild (package:flutter/src/rendering/custom_layout.dart:171:12)
#7      _ScaffoldLayout.performLayout (package:flutter/src/material/scaffold.dart:1080:7)
#8      MultiChildLayoutDelegate._callPerformLayout (package:flutter/src/rendering/custom_layout.dart:240:7)
#9      RenderCustomMultiChildLayoutBox.performLayout (package:flutter/src/rendering/custom_layout.dart:410:14)
#10     RenderObject.layout (package:flutter/src/rendering/object.dart:2189:7)
#11     RenderBox.layout (package:flutter/src/rendering/box.dart:2430:11)
#12     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:120:14)
#13     RenderObject.layout (package:flutter/src/rendering/object.dart:2189:7)
#14     RenderBox.layout (package:flutter/src/rendering/box.dart:2430:11)
#15     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:120:14)
#16     _RenderCustomClip.performLayout (package:flutter/src/rendering/proxy_box.dart:1467:11)
#17     RenderObject.layout (package:flutter/src/rendering/object.dart:2189:7)
#18     RenderBox.layout (package:flutter/src/rendering/box.dart:2430:11)
#19     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:120:14)
#20     RenderObject.layout (package:flutter/src/rendering/object.dart:2189:7)
#21     RenderBox.layout (package:flutter/src/rendering/box.dart:2430:11)
#22     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:120:14)
#23     RenderObject.layout (package:flutter/src/rendering/object.dart:2189:7)
#24     RenderBox.layout (package:flutter/src/rendering/box.dart:2430:11)
#25     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:120:14)
#26     RenderObject.layout (package:flutter/src/rendering/object.dart:2189:7)
#27     RenderBox.layout (package:flutter/src/rendering/box.dart:2430:11)
#28     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:120:14)
#29     RenderObject.layout (package:flutter/src/rendering/object.dart:2189:7)
#30     RenderBox.layout (package:flutter/src/rendering/box.dart:2430:11)
#31     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:120:14)
#32     RenderObject.layout (package:flutter/src/rendering/object.dart:2189:7)
#33     RenderBox.layout (package:flutter/src/rendering/box.dart:2430:11)
#34     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:120:14)
#35     RenderObject.layout (package:flutter/src/rendering/object.dart:2189:7)
#36     RenderBox.layout (package:flutter/src/rendering/box.dart:2430:11)
#37     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:120:14)
#38     RenderObject.layout (package:flutter/src/rendering/object.dart:2189:7)
#39     RenderBox.layout (package:flutter/src/rendering/box.dart:2430:11)
#40     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:120:14)
#41     RenderObject.layout (package:flutter/src/rendering/object.dart:2189:7)
#42     RenderBox.layout (package:flutter/src/rendering/box.dart:2430:11)
#43     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:120:14)
#44     RenderObject.layout (package:flutter/src/rendering/object.dart:2189:7)
#45     RenderBox.layout (package:flutter/src/rendering/box.dart:2430:11)
#46     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:120:14)
#47     RenderOffstage.performLayout (package:flutter/src/rendering/proxy_box.dart:3815:13)
#48     RenderObject.layout (package:flutter/src/rendering/object.dart:2189:7)
#49     RenderBox.layout (package:flutter/src/rendering/box.dart:2430:11)
#50     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:120:14)
#51     RenderObject.layout (package:flutter/src/rendering/object.dart:2189:7)
#52     RenderBox.layout (package:flutter/src/rendering/box.dart:2430:11)
#53     _RenderTheatre.performLayout (package:flutter/src/widgets/overlay.dart:856:15)
#54     RenderObject.layout (package:flutter/src/rendering/object.dart:2189:7)
#55     RenderBox.layout (package:flutter/src/rendering/box.dart:2430:11)
#56     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:120:14)
#57     RenderObject.layout (package:flutter/src/rendering/object.dart:2189:7)
#58     RenderBox.layout (package:flutter/src/rendering/box.dart:2430:11)
#59     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:120:14)
#60     RenderObject.layout (package:flutter/src/rendering/object.dart:2189:7)
#61     RenderBox.layout (package:flutter/src/rendering/box.dart:2430:11)
#62     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:120:14)
#63     RenderObject.layout (package:flutter/src/rendering/object.dart:2189:7)
#64     RenderBox.layout (package:flutter/src/rendering/box.dart:2430:11)
#65     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:120:14)
#66     RenderCustomPaint.performLayout (package:flutter/src/rendering/custom_paint.dart:552:11)
#67     RenderObject.layout (package:flutter/src/rendering/object.dart:2189:7)
#68     RenderBox.layout (package:flutter/src/rendering/box.dart:2430:11)
#69     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:120:14)
#70     RenderObject.layout (package:flutter/src/rendering/object.dart:2189:7)
#71     RenderBox.layout (package:flutter/src/rendering/box.dart:2430:11)
#72     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:120:14)
#73     RenderObject.layout (package:flutter/src/rendering/object.dart:2189:7)
#74     RenderBox.layout (package:flutter/src/rendering/box.dart:2430:11)
#75     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:120:14)
#76     RenderObject.layout (package:flutter/src/rendering/object.dart:2189:7)
#77     RenderBox.layout (package:flutter/src/rendering/box.dart:2430:11)
#78     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:120:14)
#79     RenderObject.layout (package:flutter/src/rendering/object.dart:2189:7)
#80     RenderBox.layout (package:flutter/src/rendering/box.dart:2430:11)
#81     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:120:14)
#82     RenderObject.layout (package:flutter/src/rendering/object.dart:2189:7)
#83     RenderBox.layout (package:flutter/src/rendering/box.dart:2430:11)
#84     RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:120:14)
#85     RenderObject.layout (package:flutter/src/rendering/object.dart:2189:7)
#86     RenderBox.layout (package:flutter/src/rendering/box.dart:2430:11)
#87     RenderView.performLayout (package:flutter/src/rendering/view.dart:175:14)
#88     RenderObject._layoutWithoutResize (package:flutter/src/rendering/object.dart:2027:7)
#89     PipelineOwner.flushLayout (package:flutter/src/rendering/object.dart:1020:18)
#90     RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:516:19)
#91     WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:869:13)
#92     RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:381:5)
#93     SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1289:15)
#94     SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1218:9)
#95     SchedulerBinding.scheduleWarmUpFrame.<anonymous closure> (package:flutter/src/scheduler/binding.dart:942:7)
#99     _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:192:26)
(elided 3 frames from class _Timer and dart:async-patch)

The following RenderObject was being processed when the exception was fired: RenderCustomMultiChildLayoutBox#71e82 relayoutBoundary=up1 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE:
  creator: CustomMultiChildLayout ← KeyedSubtree-[GlobalKey#bdc5b] ← _BodyBuilder ← MediaQuery ←
    LayoutId-[<_ScaffoldSlot.body>] ← CustomMultiChildLayout ← _ActionsMarker ← Actions ←
    AnimatedBuilder ← DefaultTextStyle ← AnimatedDefaultTextStyle ← _InkFeatures-[GlobalKey#ce008 ink
    renderer] ← ⋯
  parentData: offset=Offset(0.0, 0.0); id=_ScaffoldSlot.body (can use size)
  constraints: BoxConstraints(0.0<=w<=952.0, 0.0<=h<=1014.0)
  size: MISSING
This RenderObject had the following descendants (showing up to depth 5):
    child 1: RenderConstrainedBox#7ee0d NEEDS-LAYOUT NEEDS-PAINT
    child 2: RenderConstrainedBox#2dd2d NEEDS-LAYOUT NEEDS-PAINT
    child 3: RenderConstrainedBox#ed89d NEEDS-LAYOUT NEEDS-PAINT
════════════════════════════════════════════════════════════════════════════════════════════════════

Another exception was thrown: RenderBox was not laid out: RenderCustomMultiChildLayoutBox#71e82 relayoutBoundary=up1 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE

Another exception was thrown: Updated layout information required for RenderConstrainedBox#7ee0d NEEDS-LAYOUT NEEDS-PAINT to calculate semantics.
The Flutter DevTools debugger and profiler on Linux is available at: http://127.0.0.1:9100?uri=http://127.0.0.1:35461/Le6dWbqzasA=/

Another exception was thrown: 'package:flutter/src/widgets/binding.dart': Failed assertion: line 842 pos 14: '!_firstFrameCompleter.isCompleted': is not true.

TahaTesser · 2023-04-19T10:25:46Z

It seems like a documentation issue.

Looking into the source _idToChild is only assigned when layout and getSize is called before the layout.

flutter: getSize
flutter: performLayout

As expected _idToChild is null before layout.

hasChild looks for _idToChild which is not assigned until layout

bool hasChild(Object childId) => _idToChild![childId] != null;

fixes #115898 `hasChild` checks `_idToChild` map. `_idToChild` is not assigned until `_callPerformLayout` is called. So `hasChild` shouldn't be called in `getSize`. https://github.com/flutter/flutter/blob/df789c9e76098e82f80f2c5de8b5560f360afa40/packages/flutter/lib/src/rendering/custom_layout.dart#L400-L404 Updated docs and example class names.

fixes flutter#115898 `hasChild` checks `_idToChild` map. `_idToChild` is not assigned until `_callPerformLayout` is called. So `hasChild` shouldn't be called in `getSize`. https://github.com/flutter/flutter/blob/df789c9e76098e82f80f2c5de8b5560f360afa40/packages/flutter/lib/src/rendering/custom_layout.dart#L400-L404 Updated docs and example class names.

github-actions · 2023-05-27T09:00:54Z

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.

exaby73 added the in triage Presently being triaged by the triage team label Nov 23, 2022

goderbauer added the P2 Important issues not at the top of the work list label Nov 29, 2022

TahaTesser added the documentation label Apr 19, 2023

TahaTesser added the d: api docs Issues with https://api.flutter.dev/ label May 10, 2023

TahaTesser self-assigned this May 10, 2023

TahaTesser mentioned this issue May 10, 2023

Fix MultiChildLayoutDelegate.hasChild doc #126433

Merged

8 tasks

auto-submit bot closed this as completed in #126433 May 11, 2023

exaby73 added the r: fixed Issue is closed as already fixed in a newer version label May 13, 2023

github-actions bot locked as resolved and limited conversation to collaborators May 27, 2023

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Calling MultiChildLayoutDelegate.hasChild from MultiChildLayoutDelegate.getSize throws an exception because _idToChild is null #115898

Calling MultiChildLayoutDelegate.hasChild from MultiChildLayoutDelegate.getSize throws an exception because _idToChild is null #115898

crazy-rodney commented Nov 23, 2022 •

edited

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exaby73 commented Nov 23, 2022

TahaTesser commented Apr 19, 2023

github-actions bot commented May 27, 2023

Calling MultiChildLayoutDelegate.hasChild from MultiChildLayoutDelegate.getSize throws an exception because _idToChild is null #115898

Calling MultiChildLayoutDelegate.hasChild from MultiChildLayoutDelegate.getSize throws an exception because _idToChild is null #115898

Comments

crazy-rodney commented Nov 23, 2022 • edited Loading

Steps to Reproduce

exaby73 commented Nov 23, 2022

Triage report

TahaTesser commented Apr 19, 2023

github-actions bot commented May 27, 2023

crazy-rodney commented Nov 23, 2022 •

edited

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