RenderPadding constructor

RenderPadding({@required EdgeInsetsGeometry padding, TextDirection textDirection, RenderBox child })

Creates a render object that insets its child.

The padding argument must not be null and must have non-negative insets.

Implementation 

RenderPadding({
  @required EdgeInsetsGeometry padding,
  TextDirection textDirection,
  RenderBox child,
}) : assert(padding != null),
     assert(padding.isNonNegative),
     _textDirection = textDirection,
     _padding = padding,
     super(child);