QML and C++11 Enums

freddy311082

Hi guys... I have a litter question..

Can I use C++11 enums in QML ??

I can define my enums on my c++ class and export it to qml, but can I use instead normal enum a c++11 enum using:

enum class A{v1,v2}

????

that is my quesiton

regards

p3c0

Hi @freddy311082 Yes indeed we can definitely use. You have to declare it as a metatype using Q_DECLARE_METATYPE. I regularly use them. Check it here and usage is here.

freddy311082

@p3c0 said:

here

thanks... that answer my question

rgards

p3c0

@freddy311082 You're Welcome. Please mark the post as solved if done.

seyed

@p3c0 but how can you use following enums?

enum class Animal { dog, deer, cat, bird, human };  // enum class
enum class Mammal { kangaroo, deer, human };        // another enum class

Note that deer is in both enum classes. How you distinguish these?

raven-worx

@seyed
you don't. You should name them already differently to make it clear. See Qt enums for example.

enum Animal { dogAnimal, deerAnimal, catAnimal, birdAnimal, humanAnimal };
enum Mammal { kangarooMammal , deerMammal , humanMammal  }

freddy311082

@seyed

Hi. I had the same issue and as Qt Enums doesn't let you use as you describe before, what I did was create a single class per Enum, also I export each class to QML to use it. So, if you have

enum Animal { dogAnimal, deerAnimal, catAnimal, birdAnimal, humanAnimal };

at least I did:

class Animal : public QObject
{
    Q_OBJECT
public:
    Animal(QObject* parent = nullptr);
    enum class AnimalEnum { dog, deer, cat, bird, human };;
    virtual ~Animal(){}
};

Q_DECLARE_METATYPE(Animal::AnimalEnum);

The same for Mammal enum. After that, you can register this classes to be used in QML, and you will be available to do

Animal.deer
Mammal.deer

at least, is what I do when I have a situation like yours

Regards