asBoxConstraints method
Returns BoxConstraints that reflects the sliver constraints.
The minExtent
and maxExtent
are used as the constraints in the main
axis. If non-null, the given crossAxisExtent
is used as a tight
constraint in the cross axis. Otherwise, the crossAxisExtent
from this
object is used as a constraint in the cross axis.
Useful for slivers that have RenderBox children.
Implementation
BoxConstraints asBoxConstraints({
double minExtent = 0.0,
double maxExtent = double.infinity,
double crossAxisExtent,
}) {
crossAxisExtent ??= this.crossAxisExtent;
switch (axis) {
case Axis.horizontal:
return BoxConstraints(
minHeight: crossAxisExtent,
maxHeight: crossAxisExtent,
minWidth: minExtent,
maxWidth: maxExtent,
);
case Axis.vertical:
return BoxConstraints(
minWidth: crossAxisExtent,
maxWidth: crossAxisExtent,
minHeight: minExtent,
maxHeight: maxExtent,
);
}
return null;
}