Flow({Key key, @required FlowDelegate delegate, List<Widget> children: const [] })

Creates a flow layout.

Wraps each of the given children in a RepaintBoundary to avoid repainting the children when the flow repaints.

The delegate argument must not be null.

Source 

Flow({
  Key key,
  @required this.delegate,
  List<Widget> children: const <Widget>[],
}) : super(key: key, children: RepaintBoundary.wrapAll(children)) {
  assert(delegate != null);
}