Stack constructor

Stack({Key key, AlignmentGeometry alignment: AlignmentDirectional.topStart, TextDirection textDirection, StackFit fit: StackFit.loose, Overflow overflow: Overflow.clip, List<Widget> children: const [] })

Creates a stack layout widget.

By default, the non-positioned children of the stack are aligned by their top left corners.

Implementation 

Stack({
  Key key,
  this.alignment = AlignmentDirectional.topStart,
  this.textDirection,
  this.fit = StackFit.loose,
  this.overflow = Overflow.clip,
  List<Widget> children = const <Widget>[],
}) : super(key: key, children: children);