defaultComputeDistanceToFirstActualBaseline method Null safety

double? defaultComputeDistanceToFirstActualBaseline(
  1. TextBaseline baseline
)

Returns the baseline of the first child with a baseline.

Useful when the children are displayed vertically in the same order they appear in the child list.

Implementation

double? defaultComputeDistanceToFirstActualBaseline(TextBaseline baseline) {
  assert(!debugNeedsLayout);
  ChildType? child = firstChild;
  while (child != null) {
    final ParentDataType? childParentData = child.parentData as ParentDataType?;
    final double? result = child.getDistanceToActualBaseline(baseline);
    if (result != null)
      return result + childParentData!.offset.dy;
    child = childParentData!.nextSibling;
  }
  return null;
}