Gradient colors overlapping with each other

[wajahat414]

The following assertion was thrown during paint():
RenderBox was not laid out: RenderViewport#bc66b NEEDS-PAINT
'package:flutter/src/rendering/box.dart':
Failed assertion: line 1979 pos 12: 'hasSize'


Either the assertion indicates an error in the framework itself, or we should provide substantially more information in this error message to help you determine and fix the underlying cause.
In either case, please report this assertion by filing a bug on GitHub:
  https://github.com/flutter/flutter/issues/new?template=2_bug.md

The relevant error-causing widget was: 
  ListView ListView:file:///C:/Users/akram/myapp/lib/presentation/history/History.dart:127:28
When the exception was thrown, this was the stack: 
#2      RenderBox.size (package:flutter/src/rendering/box.dart:1979:12)
#3      RenderBox.paintBounds (package:flutter/src/rendering/box.dart:2617:41)
#4      PaintingContext._repaintCompositedChild (package:flutter/src/rendering/object.dart:140:56)
#5      PaintingContext.repaintCompositedChild (package:flutter/src/rendering/object.dart:100:5)
#6      PaintingContext._compositeChild (package:flutter/src/rendering/object.dart:198:7)
#7      PaintingContext.paintChild (package:flutter/src/rendering/object.dart:185:7)
#8      RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:140:15)
#9      RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2477:7)
#10     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:187:13)
#11     RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:140:15)
#12     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2477:7)
#13     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:187:13)
#14     RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:140:15)
#15     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2477:7)
#16     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:187:13)
#17     RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:140:15)
#18     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2477:7)
#19     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:187:13)
#20     RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:140:15)
#21     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2477:7)
#22     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:187:13)
#23     RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:140:15)
#24     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2477:7)
#25     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:187:13)
#26     RenderBoxContainerDefaultsMixin.defaultPaint (package:flutter/src/rendering/box.dart:2844:15)
#27     RenderFlex.paint (package:flutter/src/rendering/flex.dart:1078:7)
#28     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2477:7)
#29     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:187:13)
#30     RenderBoxContainerDefaultsMixin.defaultPaint (package:flutter/src/rendering/box.dart:2844:15)
#31     RenderCustomMultiChildLayoutBox.paint (package:flutter/src/rendering/custom_layout.dart:408:5)
#32     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2477:7)
#33     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:187:13)
#34     RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:140:15)
#35     _RenderInkFeatures.paint (package:flutter/src/material/material.dart:598:11)
#36     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2477:7)
#37     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:187:13)
#38     RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:140:15)
#39     PaintingContext.pushLayer (package:flutter/src/rendering/object.dart:387:12)
#40     RenderPhysicalModel.paint (package:flutter/src/rendering/proxy_box.dart:1951:15)
#41     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2477:7)
#42     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:187:13)
#43     RenderBoxContainerDefaultsMixin.defaultPaint (package:flutter/src/rendering/box.dart:2844:15)
#44     RenderCustomMultiChildLayoutBox.paint (package:flutter/src/rendering/custom_layout.dart:408:5)
#45     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2477:7)
#46     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:187:13)
#47     RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:140:15)
#48     _RenderInkFeatures.paint (package:flutter/src/material/material.dart:598:11)
#49     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2477:7)
#50     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:187:13)
#51     RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:140:15)
#52     PaintingContext.pushLayer (package:flutter/src/rendering/object.dart:387:12)
#53     RenderPhysicalModel.paint (package:flutter/src/rendering/proxy_box.dart:1951:15)
#54     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2477:7)
#55     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:187:13)
#56     RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:140:15)
#57     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2477:7)
#58     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:187:13)
#59     RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:140:15)
#60     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2477:7)
#61     PaintingContext._repaintCompositedChild (package:flutter/src/rendering/object.dart:141:11)
#62     PaintingContext.repaintCompositedChild (package:flutter/src/rendering/object.dart:100:5)
#63     PipelineOwner.flushPaint (package:flutter/src/rendering/object.dart:995:29)
#64     RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:506:19)
#65     WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:892:13)
#66     RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:370:5)
#67     SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1146:15)
#68     SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1083:9)
#69     SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:997:5)
#73     _invoke (dart:ui/hooks.dart:151:10)
#74     PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:308:5)
#75     _drawFrame (dart:ui/hooks.dart:115:31)
(elided 5 frames from class _AssertionError and dart:async)
The following RenderObject was being processed when the exception was fired: RenderIgnorePointer#e186c relayoutBoundary=up10
...  needs compositing
...  parentData: <none> (can use size)
...  constraints: BoxConstraints(0.0<=w<=392.7, 0.0<=h<=Infinity)
...  size: MISSING
...  ignoring: false
...  ignoringSemantics: false
RenderObject: RenderIgnorePointer#e186c relayoutBoundary=up10
  needs compositing
  parentData: <none> (can use size)
  constraints: BoxConstraints(0.0<=w<=392.7, 0.0<=h<=Infinity)
  size: MISSING
  ignoring: false
  ignoringSemantics: false
...  child: RenderViewport#bc66b NEEDS-PAINT
...    needs compositing
...    parentData: <none> (can use size)
...    constraints: BoxConstraints(0.0<=w<=392.7, 0.0<=h<=Infinity)
...    layer: OffsetLayer#bfdde DETACHED
...      handles: 1
...      offset: Offset(0.0, 0.0)
...    size: MISSING
...    axisDirection: down
...    crossAxisDirection: right
...    offset: ScrollPositionWithSingleContext#f6624(offset: 0.0, range: null..null, viewport: null, ScrollableState, AlwaysScrollableScrollPhysics -> BouncingScrollPhysics -> RangeMaintainingScrollPhysics, IdleScrollActivity#30f36, ScrollDirection.idle)
...    anchor: 0.0
...    center child: RenderSliverPadding#fc714 NEEDS-LAYOUT NEEDS-PAINT
...      parentData: paintOffset=Offset(0.0, 0.0)
...      constraints: MISSING
...      geometry: null
...      padding: EdgeInsets.zero
...      textDirection: ltr
...      child: RenderSliverList#aefd6 NEEDS-LAYOUT NEEDS-PAINT
...        parentData: paintOffset=Offset(0.0, 0.0)
...        constraints: MISSING
...        geometry: null
...        no children current live
====================================================================================================

[apgapg]

Okay I shall check. Can you please share sample code for reproduction?

[apgapg]

I tried checking but example code works fine. Please check if for length of gradient list.

[wajahat414]

Sorry, the Problem Was with some other code, I thought Graph is causing the problem, but it was strange changing gradient length was actually affecting the behavior, you can close this issue,

[wajahat414]

Can you tell me How to avoid
color Overlap when we apply gradient at the union of two gradeints they mix up with each other , I think it is better if one of the gradients doesn't mix with each other

[wajahat414]

In ring Shape

[apgapg]

hm, never thought of this case. May be this is occurring due to rounded ends. I shall check this. Can you please share gradient list? this would make debug easy

[wajahat414]

final gradientList = <List>[
[Color.fromRGBO(255, 255, 255, 1.0),
Color.fromRGBO(251, 192, 14, 1.0),

],
[
Color.fromRGBO(41, 179, 255, 1.0),

Color.fromRGBO(255, 255, 255, 1.0),

],

];