check method

@override List<A11yViolation> check(List<A11ySemanticsNodeInfo> nodes)

Inspects nodes — a snapshot captured by SemanticsTreeWalker — and returns any violations found.

Implementation

@override
List<A11yViolation> check(List<A11ySemanticsNodeInfo> nodes) {
  final violations = <A11yViolation>[];

  for (final node in nodes) {
    final siblings = node.childrenInTraversalOrder
        .where((child) => child.isInteractive && !child.isHidden)
        .toList(growable: false);
    if (siblings.length < 2) continue;

    final readingOrder = [...siblings]..sort(_byReadingOrder);
    if (_sameOrder(siblings, readingOrder)) continue;

    violations.add(
      A11yViolation(
        ruleId: id,
        severity: A11ySeverity.warning,
        bounds: node.rect,
        message:
            'Focus order among ${siblings.length} sibling widgets does '
            'not match their visual layout — a screen reader or switch '
            'control would move through them out of visual order.',
        suggestedFix:
            'Reorder the widgets in the build method to match the visual '
            'layout, or set an explicit Semantics(sortKey: ...) to '
            'control traversal order directly.',
      ),
    );
  }

  return violations;
}