layout method
layout API.
Implementation
@override
PwBox layout(Context context, BoxConstraints constraints) {
final double h = height ?? 12;
final double w = constraints.hasBoundedWidth ? constraints.maxWidth : 200;
final double t = thickness ?? 0.8;
final String c = color ?? 'B0BEC5';
return _DividerBox(PwSize(w, h), t, c, indent, endIndent);
}