Make a Column with an Expanded Widget scrollable

avatar
4412    1 year ago

I want to make a infinit height column (because of expanded widget) scrollable, but a SingleChildScrollView does not do the job.

new Scaffold(
    backgroundColor: Color.fromRGBO(245, 245, 245, 1.0),
    body: new Container(
      child: SingleChildScrollView(
        child: new Column(
          mainAxisSize: MainAxisSize.max,
          children: <Widget>[
            header,
            new Expanded(
              child: pageView,
            )
          ],
        )
      )
    ),
  )

Error Message:

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.

Answers { 1 }
avatar
1 year ago

try this:

new Scaffold(
backgroundColor: Color.fromRGBO(245, 245, 245, 1.0),
body: new Container(
  child: SingleChildScrollView(
    child: Sizedbox(
      height: MediaQuery.of(context).size.height // or something simular :)
      child: new Column(
        mainAxisSize: MainAxisSize.max,
        children: <Widget>[
          header,
          new Expanded(
            child: pageView,
          ),
        ],
      ),
    ),
  ),
),

),