debugAssertIsValid method
override
In debug mode, throws an exception if the object is not in a valid configuration. Otherwise, returns true.
This is intended to be used as follows:
assert(myDecoration.debugAssertIsValid());
Implementation
@override
bool debugAssertIsValid() {
assert(shape != BoxShape.circle || borderRadius == null); // Can't have a border radius if you're a circle.
return super.debugAssertIsValid();
}