lcsvcn / cool-stepper-reloaded Goto Github PK

  Widget _buildChooseRoute(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.all(8.0),
      child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Padding(
              padding: const EdgeInsets.only(bottom: 10.0),
              child: Center(
                  child: Lottie.asset('asset/animation/choose-route.json',
                      height: 200)),
            ),
            const Padding(
              padding: EdgeInsets.only(bottom: 10.0),
              child:
                  Text('Available routes:', style: TextStyle(fontSize: 14.0)),
            ),
            Expanded(
              flex: 1,
              child: ListView.builder(
                  shrinkWrap: true,
                  itemCount: RouteDefinitionUtil.available().length,
                  itemBuilder: (context, index) {
                    return RadioListTile<int>(
                      controlAffinity: ListTileControlAffinity.trailing,
                      value: RouteDefinitionUtil.available()[index].id,
                      title: Text(RouteDefinitionUtil.available()[index].name,
                          style: const TextStyle(fontSize: 14.0)),
                      subtitle: Text(
                          RouteDefinitionUtil.available()[index].description,
                          style: const TextStyle(fontSize: 12.0)),
                      groupValue: _formModel.routeId,
                      onChanged: (value) {
                        if (value != null) {
                          setState(() {
                            _formModel.routeId = value;
                          });
                        }
                      },
                    );
                  }),
            )
          ]),
    );
  }

 List<CoolStep> _buildSteps(BuildContext context) {
    List<CoolStep> aSteps = [];
    aSteps.add(CoolStep(
        title: 'Select journey route',
        subtitle: 'Choose from one of 21 different routes',
        content: _buildChooseRoute(context),
        validation: () {
          return null;
        }));

The following assertion was thrown during performLayout():
RenderFlex children have non-zero flex but incoming height constraints are unbounded.

When a column is in a parent that does not provide a finite height constraint, for example if it is in a vertical scrollable, it will try to shrink-wrap its children along the vertical 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 vertical 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#de429 relayoutBoundary=up13 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
  parentData: offset=Offset(0.0, 0.0) (can use size)
  constraints: BoxConstraints(0.0<=w<=395.4, 0.0<=h<=Infinity)
  size: MISSING
  direction: vertical
  mainAxisAlignment: start
  mainAxisSize: max
  crossAxisAlignment: start
  textDirection: ltr
  verticalDirection: down
...  child 1: RenderPadding#c6761 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
...    parentData: offset=Offset(0.0, 0.0); flex=null; fit=null
...    constraints: MISSING
...    size: MISSING
...    padding: EdgeInsets(0.0, 0.0, 0.0, 10.0)
...    textDirection: ltr
...    child: RenderPositionedBox#2e295 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
...      parentData: offset=Offset(0.0, 0.0)
...      constraints: MISSING
...      size: MISSING
...      alignment: Alignment.center
...      textDirection: ltr
...      widthFactor: expand
...      heightFactor: expand
...      child: RenderRepaintBoundary#4a3b7 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
...        needs compositing
...        parentData: offset=Offset(0.0, 0.0)
...        constraints: MISSING
...        size: MISSING
...        usefulness ratio: no metrics collected yet (never painted)
...        child: RenderLottie#17c01 NEEDS-LAYOUT NEEDS-PAINT
...          parentData: <none>
...          constraints: MISSING
...          size: MISSING
...          composition: null
...          height: 200.0
...          alignment: Alignment.center
...  child 2: RenderPadding#aeaae NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
...    parentData: offset=Offset(0.0, 0.0); flex=null; fit=null
...    constraints: MISSING
...    size: MISSING
...    padding: EdgeInsets(0.0, 0.0, 0.0, 10.0)
...    textDirection: ltr
...    child: RenderParagraph#8c534 NEEDS-LAYOUT NEEDS-PAINT
...      parentData: offset=Offset(0.0, 0.0)
...      constraints: MISSING
...      size: MISSING
...      textAlign: start
...      textDirection: ltr
...      softWrap: wrapping at box width
...      overflow: clip
...      textScaleFactor: 1.1
...      locale: en_US
...      maxLines: unlimited
...      text: TextSpan
...        debugLabel: ((englishLike bodyMedium 2014).merge(blackMountainView bodyMedium)).merge(unknown)
...        inherit: false
...        color: Color(0xdd000000)
...        family: Roboto
...        size: 14.0
...        weight: 400
...        baseline: alphabetic
...        decoration: TextDecoration.none
...        "Available routes:"
...  child 3: RenderRepaintBoundary#84622 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
...    needs compositing
...    parentData: offset=Offset(0.0, 0.0); flex=1; fit=FlexFit.tight
...    constraints: MISSING
...    size: MISSING
...    usefulness ratio: no metrics collected yet (never painted)
...    child: RenderCustomPaint#f2eb0 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
...      parentData: <none>
...      constraints: MISSING
...      size: MISSING
...      painter: null
...      foregroundPainter: _GlowingOverscrollIndicatorPainter(_GlowController(color: Color(0xff2196f3), axis: vertical), _GlowController(color: Color(0xff2196f3), axis: vertical))
...      child: RenderRepaintBoundary#500f5 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
...        needs compositing
...        parentData: <none>
...        constraints: MISSING
...        size: MISSING
...        usefulness ratio: no metrics collected yet (never painted)
...        child: _RenderScrollSemantics#08b55 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
...          parentData: <none>
...          constraints: MISSING
...          semantic boundary
...          size: MISSING
The creator information is set to: Column ← Padding ← Padding ← _SingleChildViewport ← IgnorePointer-[GlobalKey#56705] ← Semantics ← Listener ← _GestureSemantics ← RawGestureDetector-[LabeledGlobalKey<RawGestureDetectorState>#8afcb] ← Listener ← _ScrollableScope ← _ScrollSemantics-[GlobalKey#2f880] ← ⋯
The nearest ancestor providing an unbounded width constraint is: _RenderSingleChildViewport#69502 relayoutBoundary=up10 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
...  needs compositing
...  parentData: <none> (can use size)
...  constraints: BoxConstraints(0.0<=w<=411.4, 0.0<=h<=621.8)
...  size: MISSING
...  offset: Offset(0.0, -0.0)

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