Positioned constructor

const Positioned({ Key? key, double? left, double? top, double? right, 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 (left, right, 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:

• Positioned.directional, which specifies the widget's horizontal position using start and end rather than left and right.
• PositionedDirectional, which is similar to Positioned.directional but adapts to the ambient Directionality.

Implementation

const Positioned(
    {super.key,
    this.left,
    this.top,
    this.right,
    this.bottom,
    this.width,
    this.height,
    required this.child})
    : assert(left == null || right == null || width == null),
      assert(top == null || bottom == null || height == null);