sized_box_shrink_expand

Use SizedBox shrink and expand named constructors.

Use SizedBox.shrink(...) and SizedBox.expand(...) constructors appropriately.

Either the SizedBox.shrink(...) or SizedBox.expand(...) constructor should be used instead of the more general SizedBox(...) constructor when one of the named constructors capture the intent of the code more succinctly.

Examples

BAD:

Widget buildLogo() {
  return SizedBox(
    height: 0,
    width: 0,
    child: const MyLogo(),
  );
}

Widget buildLogo() {
  return SizedBox(
    height: double.infinity,
    width: double.infinity,
    child: const MyLogo(),
  );
}

GOOD:

Widget buildLogo() {
  return SizedBox.shrink(
    child: const MyLogo(),
  );
}

Widget buildLogo() {
  return SizedBox.expand(
    child: const MyLogo(),
  );
}

To enable the sized_box_shrink_expand rule, add sized_box_shrink_expand under linter > rules in your analysis_options.yaml file:

linter:
  rules:
    - sized_box_shrink_expand

If you're instead using the YAML map syntax to configure linter rules, add sized_box_shrink_expand: true under linter > rules:

linter:
  rules:
    sized_box_shrink_expand: true

Unless stated otherwise, the documentation on this site reflects Dart 3.6.0. Page last updated on 2025-01-27. View source or report an issue.