color method
Implementation
Color? color(dynamic id) {
if(id is Color) {
return id;
}
if(id == null) {
return null;
}
final val = value(id);
var color;
if(val is Color) {
color = val;
} else if(val is TextStyle) {
color = val.color;
} else {
_throwUnsupportedType(id, val);
}
return color;
}