How to add Column widget to Row widget in Flutter?-CodePudding

I want to add Column widget to Row widget.

I have a data structure as follows:

Scaffold
 - Padding
    - SingleChildScrollView
       - Column
          - Row
             - CircleAvatar
             - Column (The Column I am talking about below)
                - Text
                - Row
                   - Expanded
                      - MaterialButton
                   - Expanded
                      - Container
                   - Expanded
                      - MaterialButton
          - ListTile

When adding a Column to a Row, I get an error:

════════ Exception caught by rendering library ═════════════════════════════════
The following assertion was thrown during performLayout():
RenderFlex children have non-zero flex but incoming width constraints are unbounded.

When a row is in a parent that does not provide a finite width constraint, for example if it is in a horizontal scrollable, it will try to shrink-wrap its children along the horizontal axis. Setting a flex on a child (e.g. using Expanded) indicates that the child is to expand to fill the remaining space in the horizontal direction.
These two directives are mutually exclusive. If a parent is to shrink-wrap its child, the child cannot simultaneously expand to fit its parent.

Consider setting mainAxisSize to MainAxisSize.min and using FlexFit.loose fits for the flexible children (using Flexible rather than Expanded). This will allow the flexible children to size themselves to less than the infinite remaining space they would otherwise be forced to take, and then will cause the RenderFlex to shrink-wrap the children rather than expanding to fit the maximum constraints provided by the parent.

If this message did not help you determine the problem, consider using debugDumpRenderTree():
  https://flutter.dev/debugging/#rendering-layer
  http://api.flutter.dev/flutter/rendering/debugDumpRenderTree.html
The affected RenderFlex is: RenderFlex#acbae relayoutBoundary=up15 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
    parentData: offset=Offset(0.0, 0.0); flex=null; fit=null (can use size)
    constraints: BoxConstraints(unconstrained)
    size: MISSING
    direction: horizontal
    mainAxisAlignment: start
    mainAxisSize: max
    crossAxisAlignment: center
    textDirection: ltr
    verticalDirection: down
    child 1: RenderConstrainedBox#404ec NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
        parentData: offset=Offset(0.0, 0.0); flex=3; fit=FlexFit.tight
        constraints: MISSING
        size: MISSING
        additionalConstraints: BoxConstraints(w=180.0, h=50.0)
        child: RenderSemanticsAnnotations#4f838 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
            parentData: <none>
            constraints: MISSING
            semantic boundary
            size: MISSING
            child: _RenderInputPadding#04251 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
                parentData: <none>
                constraints: MISSING
                size: MISSING
                child: RenderConstrainedBox#3337d NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
                    parentData: offset=Offset(0.0, 0.0)
                    constraints: MISSING
                    size: MISSING
                    additionalConstraints: BoxConstraints(88.0<=w<=Infinity, 36.0<=h<=Infinity)
    child 2: RenderLimitedBox#593aa NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
        parentData: offset=Offset(0.0, 0.0); flex=1; fit=FlexFit.tight
        constraints: MISSING
        size: MISSING
        maxWidth: 0.0
        maxHeight: 0.0
        child: RenderConstrainedBox#d1172 NEEDS-LAYOUT NEEDS-PAINT
            parentData: <none>
            constraints: MISSING
            size: MISSING
            additionalConstraints: BoxConstraints(biggest)
    child 3: RenderConstrainedBox#42764 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
        parentData: offset=Offset(0.0, 0.0); flex=3; fit=FlexFit.tight
        constraints: MISSING
        size: MISSING
        additionalConstraints: BoxConstraints(w=180.0, h=50.0)
        child: RenderSemanticsAnnotations#7ec96 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
            parentData: <none>
            constraints: MISSING
            semantic boundary
            size: MISSING
            child: _RenderInputPadding#6aa1f NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
                parentData: <none>
                constraints: MISSING
                size: MISSING
                child: RenderConstrainedBox#e1f60 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
                    parentData: offset=Offset(0.0, 0.0)
                    constraints: MISSING
                    size: MISSING
                    additionalConstraints: BoxConstraints(88.0<=w<=Infinity, 36.0<=h<=Infinity)
The creator information is set to: Row ← Column ← Row ← Column ← _SingleChildViewport ← IgnorePointer-[GlobalKey#10aed] ← Semantics ← Listener ← _GestureSemantics ← RawGestureDetector-[LabeledGlobalKey<RawGestureDetectorState>#23575] ← Listener ← _ScrollableScope ← ⋯
The nearest ancestor providing an unbounded width constraint is: RenderFlex#ede32 relayoutBoundary=up13 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE

See also: https://flutter.dev/layout/

If none of the above helps enough to fix this problem, please don't hesitate to file a bug:
  https://github.com/flutter/flutter/issues/new?template=2_bug.md
The relevant error-causing widget was
Row
When the exception was thrown, this was the stack
#0      RenderFlex.performLayout.<anonymous closure>
#1      RenderFlex.performLayout
#2      RenderObject.layout
#3      RenderBox.layout
#4      ChildLayoutHelper.layoutChild
#5      RenderFlex._computeSizes
#6      RenderFlex.performLayout
#7      RenderObject.layout
#8      RenderBox.layout
#9      ChildLayoutHelper.layoutChild
#10     RenderFlex._computeSizes
#11     RenderFlex.performLayout
#12     RenderObject.layout
#13     RenderBox.layout
#14     ChildLayoutHelper.layoutChild
#15     RenderFlex._computeSizes
#16     RenderFlex.performLayout
#17     RenderObject.layout
#18     RenderBox.layout
#19     _RenderSingleChildViewport.performLayout
#20     RenderObject.layout
#21     RenderBox.layout
#22     RenderProxyBoxMixin.performLayout
#23     RenderObject.layout
#24     RenderBox.layout
#25     RenderProxyBoxMixin.performLayout
#26     RenderObject.layout
#27     RenderBox.layout
#28     RenderProxyBoxMixin.performLayout
#29     RenderObject.layout
#30     RenderBox.layout
#31     RenderProxyBoxMixin.performLayout
#32     RenderObject.layout
#33     RenderBox.layout
#34     RenderProxyBoxMixin.performLayout
#35     RenderObject.layout
#36     RenderBox.layout
#37     RenderProxyBoxMixin.performLayout
#38     RenderObject.layout
#39     RenderBox.layout
#40     RenderProxyBoxMixin.performLayout
#41     RenderObject.layout
#42     RenderBox.layout
#43     RenderProxyBoxMixin.performLayout
#44     RenderCustomPaint.performLayout
#45     RenderObject.layout
#46     RenderBox.layout
#47     RenderProxyBoxMixin.performLayout
#48     RenderObject.layout
#49     RenderBox.layout
#50     RenderPadding.performLayout
#51     RenderObject.layout
#52     RenderBox.layout
#53     MultiChildLayoutDelegate.layoutChild
#54     _ScaffoldLayout.performLayout
#55     MultiChildLayoutDelegate._callPerformLayout
#56     RenderCustomMultiChildLayoutBox.performLayout
#57     RenderObject._layoutWithoutResize
#58     PipelineOwner.flushLayout
#59     RendererBinding.drawFrame
#60     WidgetsBinding.drawFrame
#61     RendererBinding._handlePersistentFrameCallback
#62     SchedulerBinding._invokeFrameCallback
#63     SchedulerBinding.handleDrawFrame
#64     SchedulerBinding._handleDrawFrame
#68     _invoke (dart:ui/hooks.dart:150:10)
#69     PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:318:5)
#70     _drawFrame (dart:ui/hooks.dart:115:31)
(elided 3 frames from dart:async)
The following RenderObject was being processed when the exception was fired: RenderFlex#acbae relayoutBoundary=up15 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
RenderObject: RenderFlex#acbae relayoutBoundary=up15 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
    parentData: offset=Offset(0.0, 0.0); flex=null; fit=null (can use size)
    constraints: BoxConstraints(unconstrained)
    size: MISSING
    direction: horizontal
    mainAxisAlignment: start
    mainAxisSize: max
    crossAxisAlignment: center
    textDirection: ltr
    verticalDirection: down
    child 1: RenderConstrainedBox#404ec NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
        parentData: offset=Offset(0.0, 0.0); flex=3; fit=FlexFit.tight
        constraints: MISSING
        size: MISSING
        additionalConstraints: BoxConstraints(w=180.0, h=50.0)
        child: RenderSemanticsAnnotations#4f838 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
            parentData: <none>
            constraints: MISSING
            semantic boundary
            size: MISSING
            child: _RenderInputPadding#04251 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
                parentData: <none>
                constraints: MISSING
                size: MISSING
                child: RenderConstrainedBox#3337d NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
                    parentData: offset=Offset(0.0, 0.0)
                    constraints: MISSING
                    size: MISSING
                    additionalConstraints: BoxConstraints(88.0<=w<=Infinity, 36.0<=h<=Infinity)
    child 2: RenderLimitedBox#593aa NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
        parentData: offset=Offset(0.0, 0.0); flex=1; fit=FlexFit.tight
        constraints: MISSING
        size: MISSING
        maxWidth: 0.0
        maxHeight: 0.0
        child: RenderConstrainedBox#d1172 NEEDS-LAYOUT NEEDS-PAINT
            parentData: <none>
            constraints: MISSING
            size: MISSING
            additionalConstraints: BoxConstraints(biggest)
    child 3: RenderConstrainedBox#42764 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
        parentData: offset=Offset(0.0, 0.0); flex=3; fit=FlexFit.tight
        constraints: MISSING
        size: MISSING
        additionalConstraints: BoxConstraints(w=180.0, h=50.0)
        child: RenderSemanticsAnnotations#7ec96 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
            parentData: <none>
            constraints: MISSING
            semantic boundary
            size: MISSING
            child: _RenderInputPadding#6aa1f NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
                parentData: <none>
                constraints: MISSING
                size: MISSING
                child: RenderConstrainedBox#e1f60 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
                    parentData: offset=Offset(0.0, 0.0)
                    constraints: MISSING
                    size: MISSING
                    additionalConstraints: BoxConstraints(88.0<=w<=Infinity, 36.0<=h<=Infinity)
════════════════════════════════════════════════════════════════════════════════

…

My code:

Row(
  children: [
    CircleAvatar(
      backgroundImage: NetworkImage(userAvatarUrl),
    ),
    Column(
      children: [
        Text(userName),
        Row(
          children: …,
        ),
      ],
    ),
  ],
),

Feel free to leave a comment if you need more information.

How to add Column widget to Row widget? I would appreciate any help. Thank you in advance!

CodePudding user response：

If the children inside the Row inside the Column can be Expanded, then considering wrapping the Column in an Expanded like so:

Row(
  children: [
    CircleAvatar(
      backgroundImage: NetworkImage(userAvatarUrl),
    ),
    Expanded(
      child: Column(
        children: [
          Text(userName),
          Row(
            children: …,
          ),
      ],
    ),
    )
  ],
),