createBoxPainter method

  1. @override
_UnderlinePainter createBoxPainter ([VoidCallback onChanged ])
override

Returns a BoxPainter that will paint this decoration.

The onChanged argument configures BoxPainter.onChanged. It can be omitted if there is no chance that the painter will change (for example, if it is a BoxDecoration with definitely no DecorationImage).

Implementation 

@override
_UnderlinePainter createBoxPainter([VoidCallback onChanged]) {
  return _UnderlinePainter(this, onChanged);
}