Flutter Expanded 源码

class Expanded extends Flexible {
  /// Creates a widget that expands a child of a [Row], [Column], or [Flex]
  /// so that the child fills the available space along the flex widget's
  /// main axis.
  const Expanded({
    super.key,
    super.flex,
    required super.child,
  }) : super(fit: FlexFit.tight);
}