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Assertion hit when navigating to a Scaffold with different body Widget #4617

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mpcomplete opened this issue Jun 17, 2016 · 4 comments
Closed

Assertion hit when navigating to a Scaffold with different body Widget #4617

mpcomplete opened this issue Jun 17, 2016 · 4 comments
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framework flutter/packages/flutter repository. See also f: labels.
Milestone
3: Current Milestone

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@mpcomplete
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mpcomplete commented Jun 17, 2016 •
edited
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Assertion text at the end. Try running the following test case. Tap the bug icon in the top right, then navigate back. The assert will trigger.

--- test case ---

import 'dart:math';

import 'package:flutter/material.dart';

class Home extends StatelessWidget {
  static final GlobalKey<ScaffoldState> _scaffoldKey = new GlobalKey<ScaffoldState>();
  Home({ Key key, this.grid: false }) : super(key: key);

  final bool grid;

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      key: _scaffoldKey,
      appBarBehavior: AppBarBehavior.under,
      appBar: new AppBar(
        actions: <Widget>[
          new IconButton(
            icon: Icons.bug_report,
            onPressed: () => _toggleGrid(context, !grid)
          )
        ]
      ),
      body: _buildBody(context)
    );
  }

  Widget _buildBody(BuildContext context) {
    if (grid) {
      return new ScrollableGrid(
        delegate: new MaxTileWidthGridDelegate(maxTileWidth: 500.0),
        children: <Widget>[]
      );
    }
    else {
      return new ScrollableViewport(child: new SizedBox());
    }
  }

  void _toggleGrid(BuildContext context, bool grid) {
    Navigator.push(context, new MaterialPageRoute<Null>(
      builder: (BuildContext context) {
        return new Home(grid: grid);
      }
    ));
  }
}

void main() {
  runApp(new MaterialApp(home: new Home()));
}

--- assertion ---

I/flutter : ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
I/flutter : The following assertion was thrown building Home:
I/flutter : scheduleBuildFor() called for a widget for which a build was already scheduled.
I/flutter : The method was called for the following element:
I/flutter : Scaffold([GlobalKey 189767604]; dirty; state: ScaffoldState(415291577))
I/flutter : The current dirty list consists of:
I/flutter : [Navigator([GlobalObjectKey _WidgetsAppState(859688735)]; state: NavigatorState(920361667)),
I/flutter : Overlay([GlobalKey 633196994]; state: OverlayState(150832888; entries:
I/flutter : [OverlayEntry@1021495924(opaque: false), OverlayEntry@819921818(opaque: false),
I/flutter : OverlayEntry@651833355(opaque: false), OverlayEntry@107573855(opaque: false)])),
I/flutter : _ModalScope([GlobalKey 558734001]; state: _ModalScopeState(768887326)),
I/flutter : _MaterialPageTransition(animation: AnimationController(◀ 1.000; for
I/flutter : MaterialPageRoute(null))➩Cubic(0.00, 0.00, 0.58, 1.00); state: _AnimatedState(551097036)),
I/flutter : Scaffold([GlobalKey 189767604]; dirty; state: ScaffoldState(415291577)),
I/flutter : Material(MaterialType.canvas; elevation: 0; state: _MaterialState(659163102)),
I/flutter : AnimatedContainer(duration: 200ms; has background; state: _AnimatedContainerState(112921519; has
I/flutter : background)), DecoratedBox(renderObject: RenderDecoratedBox DETACHED), DecoratedBox(renderObject:
I/flutter : RenderDecoratedBox DETACHED), AnimatedDefaultTextStyle(duration: 200ms; inherit: false; color:
I/flutter : Color(0xdd000000); family: "Roboto"; size: 14.0; weight: 400; baseline: alphabetic; state:
I/flutter : _AnimatedDefaultTextStyleState(812479847)), ScrollableGrid(dirty), OverscrollIndicator(dirty;
I/flutter : state: _OverscrollIndicatorState(549925713)), AnimatedBuilder(animation: AnimationController(⏮
I/flutter : 0.000; paused); dirty; state: _AnimatedState(172612090)), Scrollable(dirty; state:
I/flutter : ScrollableState(275226834)), RawGestureDetector([GlobalKey 679576939]; dirty; state:
I/flutter : RawGestureDetectorState(531534497; gestures: ; behavior: opaque)),
I/flutter : LayoutBuilder(renderObject: _RenderLayoutBuilder NEEDS-LAYOUT DETACHED),
I/flutter : Material(MaterialType.canvas; elevation: 4; color: Color(0xff2196f3); dirty; state:
I/flutter : _MaterialState(667497626)), AnimatedContainer(duration: 200ms; has background; dirty; state:
I/flutter : _AnimatedContainerState(354192772; has background)), DecoratedBox(dirty; renderObject:
I/flutter : RenderDecoratedBox DETACHED), DecoratedBox(dirty; renderObject: RenderDecoratedBox DETACHED),
I/flutter : AnimatedDefaultTextStyle(duration: 200ms; inherit: false; color: Color(0xdd000000); family:
I/flutter : "Roboto"; size: 14.0; weight: 400; baseline: alphabetic; dirty; state:
I/flutter : _AnimatedDefaultTextStyleState(714683845)), InkResponse(dirty; state:
I/flutter : _InkResponseState(992907223)), RawGestureDetector(dirty; state:
I/flutter : RawGestureDetectorState(769897258; gestures: tap; behavior: opaque)), Icon(IconData(U+0E868);
I/flutter : size: 24.0; dirty), Text(""; inherit: false; color: Color(0xffffffff); family: "MaterialIcons";
I/flutter : size: 24.0; dirty), _FloatingActionButtonTransition(state:
I/flutter : _FloatingActionButtonTransitionState(299703103)), ScaleTransition(animation: AnimationController(⏭
I/flutter : 1.000; paused)➩Cubic(0.42, 0.00, 1.00, 1.00); state: _AnimatedState(547328635)),
I/flutter : RotationTransition(animation: AnimationController(⏭ 1.000; paused)➩Cubic(0.42, 0.00, 1.00,
I/flutter : 1.00)➩Tween(-0.125 → 0.0)➩0.0; state: _AnimatedState(1049967363))]
I/flutter : This should not be possible and probably indicates a bug in the widgets framework. Please report it:
I/flutter : https://github.com/flutter/flutter/issues/new
I/flutter : When the exception was thrown, this was the stack:
I/flutter : #0 BuildOwner.scheduleBuildFor. (package:flutter/src/widgets/framework.dart:738)
I/flutter : #1 _AssertionError._checkAssertion (dart:core-patch/errors_patch.dart:31)
I/flutter : #2 BuildOwner.scheduleBuildFor (package:flutter/src/widgets/framework.dart:736)
I/flutter : #3 BuildableElement.markNeedsBuild (package:flutter/src/widgets/framework.dart:1451)
I/flutter : #4 BuildableElement.activate (package:flutter/src/widgets/framework.dart:1510)
I/flutter : #5 StatefulElement.activate (package:flutter/src/widgets/framework.dart:1697)
I/flutter : #6 Element._activateRecursively (package:flutter/src/widgets/framework.dart:1163)
I/flutter : #7 Element._activateWithParent (package:flutter/src/widgets/framework.dart:1156)
I/flutter : #8 Element.inflateWidget (package:flutter/src/widgets/framework.dart:1119)
I/flutter : #9 Element.updateChild (package:flutter/src/widgets/framework.dart:1004)
I/flutter : #10 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:1582)
I/flutter : #11 BuildableElement.rebuild (package:flutter/src/widgets/framework.dart:1484)
I/flutter : #12 StatelessElement.update (package:flutter/src/widgets/framework.dart:1621)
I/flutter : #13 Element.updateChild (package:flutter/src/widgets/framework.dart:997)
I/flutter : #14 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:1582)
I/flutter : #15 BuildableElement.rebuild (package:flutter/src/widgets/framework.dart:1484)
I/flutter : #16 _ProxyElement.update (package:flutter/src/widgets/framework.dart:1768)
I/flutter : #17 Element.updateChild (package:flutter/src/widgets/framework.dart:997)
I/flutter : #18 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:1582)
I/flutter : #19 BuildableElement.rebuild (package:flutter/src/widgets/framework.dart:1484)
I/flutter : #20 StatelessElement.update (package:flutter/src/widgets/framework.dart:1621)
I/flutter : #21 Element.updateChild (package:flutter/src/widgets/framework.dart:997)
I/flutter : #22 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:2239)
I/flutter : #23 Element.updateChild (package:flutter/src/widgets/framework.dart:997)
I/flutter : #24 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:2239)
I/flutter : #25 Element.updateChild (package:flutter/src/widgets/framework.dart:997)
I/flutter : #26 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:1582)
I/flutter : #27 BuildableElement.rebuild (package:flutter/src/widgets/framework.dart:1484)
I/flutter : #28 StatefulElement.update (package:flutter/src/widgets/framework.dart:1692)
I/flutter : #29 Element.updateChild (package:flutter/src/widgets/framework.dart:997)
I/flutter : #30 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:2239)
I/flutter : #31 Element.updateChild (package:flutter/src/widgets/framework.dart:997)
I/flutter : #32 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:2239)
I/flutter : #33 Element.updateChild (package:flutter/src/widgets/framework.dart:997)
I/flutter : #34 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:1582)
I/flutter : #35 BuildableElement.rebuild (package:flutter/src/widgets/framework.dart:1484)
I/flutter : #36 _ProxyElement.update (package:flutter/src/widgets/framework.dart:1768)
I/flutter : #37 Element.updateChild (package:flutter/src/widgets/framework.dart:997)
I/flutter : #38 SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:2239)
I/flutter : #39 Element.updateChild (package:flutter/src/widgets/framework.dart:997)
I/flutter : #40 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:1582)
I/flutter : #41 BuildableElement.rebuild (package:flutter/src/widgets/framework.dart:1484)
I/flutter : #42 StatefulElement.update (package:flutter/src/widgets/framework.dart:1692)
I/flutter : #43 Element.updateChild (package:flutter/src/widgets/framework.dart:997)
I/flutter : #44 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:1582)
I/flutter : #45 BuildableElement.rebuild (package:flutter/src/widgets/framework.dart:1484)
I/flutter : #46 StatefulElement.update (package:flutter/src/widgets/framework.dart:1692)
I/flutter : #47 Element.updateChild (package:flutter/src/widgets/framework.dart:997)
I/flutter : #48 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:1582)
I/flutter : #49 BuildableElement.rebuild (package:flutter/src/widgets/framework.dart:1484)
I/flutter : #50 StatefulElement.update (package:flutter/src/widgets/framework.dart:1692)
I/flutter : #51 Element.updateChild (package:flutter/src/widgets/framework.dart:997)
I/flutter : #52 RenderObjectElement.updateChildren (package:flutter/src/widgets/framework.dart:2084)
I/flutter : #53 MultiChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:2332)
I/flutter : #54 Element.updateChild (package:flutter/src/widgets/framework.dart:997)
I/flutter : #55 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:1582)
I/flutter : #56 BuildableElement.rebuild (package:flutter/src/widgets/framework.dart:1484)
I/flutter : #57 StatefulElement.update (package:flutter/src/widgets/framework.dart:1692)
I/flutter : #58 Element.updateChild (package:flutter/src/widgets/framework.dart:997)
I/flutter : #59 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:1582)
I/flutter : #60 BuildableElement.rebuild (package:flutter/src/widgets/framework.dart:1484)
I/flutter : #61 BuildOwner.buildDirtyElements. (package:flutter/src/widgets/framework.dart:834)
I/flutter : #62 BuildOwner.lockState (package:flutter/src/widgets/framework.dart:794)
I/flutter : #63 BuildOwner.buildDirtyElements (package:flutter/src/widgets/framework.dart:829)
I/flutter : #64 BindingBase&SchedulerBinding&GestureBinding&ServicesBinding&RendererBinding&WidgetsBinding.beginFrame (package:flutter/src/widgets/binding.dart:203)
I/flutter : #65 BindingBase&SchedulerBinding&GestureBinding&ServicesBinding&RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:144)
I/flutter : #66 BindingBase&SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:428)
I/flutter : #67 BindingBase&SchedulerBinding.handleBeginFrame (package:flutter/src/scheduler/binding.dart:388)
I/flutter : #68 _beginFrame (file:///b/build/slave/Linux_Engine/build/src/out/android_debug/gen/sky/bindings/dart_ui/hooks.dart:48)
I/flutter : ════════════════════════════════════════════════════════════════════════════════════════════════════
I/flutter : Another exception was thrown: 'package:flutter/src/widgets/framework.dart': Failed assertion: line 1037: '_debugLifecycleState == _ElementLifecycle.active' is not true.
I/flutter : dispose scrollable
Application finished.
@mpcomplete
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cc @Hixie

@eseidelGoogle eseidelGoogle added ⚠ bug framework flutter/packages/flutter repository. See also f: labels. labels Jul 19, 2016
@Hixie Hixie modified the milestone: Flutter 1.0 Aug 1, 2016
@Hixie Hixie modified the milestones: 3: Make conferences happy, 5: Make Hixie proud Jan 30, 2017
@Hixie Hixie added this to Unsorted in Scrolling Refactor Jan 31, 2017
@Hixie Hixie moved this from Unsorted to More RenderObject stuff in Scrolling Refactor Jan 31, 2017
@Hixie Hixie moved this from More RenderObject stuff to Unsorted in Scrolling Refactor Jan 31, 2017
@abarth
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abarth commented Feb 10, 2017 
import 'dart:math';

import 'package:flutter/material.dart';

class Home extends StatelessWidget {
  static final GlobalKey<ScaffoldState> _scaffoldKey = new GlobalKey<ScaffoldState>();
  Home({ Key key, this.grid: false }) : super(key: key);

  final bool grid;

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      key: _scaffoldKey,
      body: new CustomScrollView(
        slivers: <Widget>[
          new SliverAppBar(
            actions: <Widget>[
              new IconButton(
                icon: new Icon(Icons.bug_report),
                onPressed: () => _toggleGrid(context, !grid)
              )
            ]
          ),
          _buildBody(context),
        ]
      )
    );
  }

  Widget _buildBody(BuildContext context) {
    if (grid) {
      return new SliverGrid(
        gridDelegate: new SliverGridDelegateWithMaxCrossAxisExtent(maxCrossAxisExtent: 500.0),
        delegate: new SliverChildListDelegate(<Widget>[])
      );
    }
    else {
      return new SliverList(delegate: new SliverChildListDelegate(<Widget>[new SizedBox()]));
    }
  }

  void _toggleGrid(BuildContext context, bool grid) {
    Navigator.push(context, new MaterialPageRoute<Null>(
      builder: (BuildContext context) {
        return new Home(grid: grid);
      }
    ));
  }
}

void main() {
  runApp(new MaterialApp(home: new Home()));
}

@abarth
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abarth commented Feb 10, 2017

Doesn't throw an exception anymore. It's still banana pants crazy code. The global key is static and used in both routes. That's not really legal because they're both on screen at the same time during the transition...

In any case, the assert is fixed in the new world.

@abarth abarth closed this as completed Feb 10, 2017
@abarth abarth moved this from Unsorted to Metabugs in Scrolling Refactor Feb 10, 2017
@abarth abarth moved this from Metabugs to DONE in Scrolling Refactor Feb 10, 2017
@Hixie Hixie removed this from CLOSED in Scrolling Refactor Jun 22, 2017
cdotstout pushed a commit to cdotstout/flutter that referenced this issue Apr 3, 2018
@cbracken
Revert "Update //garnet (flutter#4611)" (flutter#4617)
293b37c 
This reverts commit 47cae4d.
This reverts commit 9b9de0e.
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github-actions bot commented Sep 5, 2021

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.

@github-actions github-actions bot locked as resolved and limited conversation to collaborators Sep 5, 2021
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