PositionedDirectional constructor

const PositionedDirectional({Key key, double start, double top, double end, double bottom, double width, double height, @required Widget child })

Creates a widget that controls where a child of a Stack is positioned.

Only two out of the three horizontal values (start, end, width), and only two out of the three vertical values (top, bottom, height), can be set. In each case, at least one of the three must be null.

See also:

Implementation 

const PositionedDirectional({
  Key key,
  this.start,
  this.top,
  this.end,
  this.bottom,
  this.width,
  this.height,
  @required this.child,
}) : super(key: key);