DropdownButtonHideUnderline constructor

const DropdownButtonHideUnderline({Key key, @required Widget child })

Creates a DropdownButtonHideUnderline. A non-null child must be given.

Implementation 

const DropdownButtonHideUnderline({
  Key key,
  @required Widget child,
}) : assert(child != null),
     super(key: key, child: child);