createBoxPainter method
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
BoxPainter createBoxPainter([void Function()? onChanged]) => _DottedBorder(
linePosition: linePosition,
borderRadius: borderRadius,
strokeWidth: strokeWidth,
shape: shape,
color: color,
dash: dash,
);