resolve method
Implementation
@override
T resolve(data, tag) {
if (data is Color && tag == #shadowColor) shadowColor = data;
if (data is double && tag == #shadowBlur) shadowBlur = data;
if (data is double && tag == #shadowSpread) shadowSpread = data;
if (data is Offset && tag == #shadowOffset) shadowOffset = data;
if (data is DecorationPosition && tag == #position) shadowPosition = data;
return super.resolve(data, tag);
}