sized_box_for_whitespace
Use a 'SizedBox' to add whitespace to a layout.
Description
#The analyzer produces this diagnostic when a Container
is created using only the height
and/or width
arguments.
Example
#The following code produces this diagnostic because the Container
has only the width
argument:
dart
import 'package:flutter/material.dart';
Widget buildRow() {
return Row(
children: <Widget>[
const Text('...'),
Container(
width: 4,
child: Text('...'),
),
const Expanded(
child: Text('...'),
),
],
);
}
Common fixes
#Replace the Container
with a SizedBox
of the same dimensions:
dart
import 'package:flutter/material.dart';
Widget buildRow() {
return Row(
children: <Widget>[
Text('...'),
SizedBox(
width: 4,
child: Text('...'),
),
Expanded(
child: Text('...'),
),
],
);
}
Unless stated otherwise, the documentation on this site reflects Dart 3.7.3. Page last updated on 2025-05-08. View source or report an issue.