FractionallySizedBox constructor Null safety

const FractionallySizedBox(
  1. {Key? key,
  2. AlignmentGeometry alignment = Alignment.center,
  3. double? widthFactor,
  4. double? heightFactor,
  5. Widget? child}
)

Creates a widget that sizes its child to a fraction of the total available space.

If non-null, the widthFactor and heightFactor arguments must be non-negative.

Implementation

const FractionallySizedBox({
  super.key,
  this.alignment = Alignment.center,
  this.widthFactor,
  this.heightFactor,
  super.child,
}) : assert(alignment != null),
     assert(widthFactor == null || widthFactor >= 0.0),
     assert(heightFactor == null || heightFactor >= 0.0);