hasAttributeValue property 
    
    
        
  
    
      
  
      bool
      get
      
hasAttributeValue
      override
     
    
  Returns true if has a value.
 
    
  Implementation
  @override
bool get hasAttributeValue {
  if (_values.isNotEmpty) {
    if (_values.length == 1) {
      return _values[0].isNotEmpty;
    } else {
      return true;
    }
  }
  return false;
}