C++ enum to QML ComboBox

[Babs]

Hello is there any way to use directly Enum from C++ as QML ComboBox model?

[Gojir4]

@Babs Hi,

If your enums are defined in a QObject subclass, you can extract list of them quite easily using Qt Meta-Object System

[JonB]

@Gojir4
Should the OP also possibly read through https://woboq.com/blog/q_enum.html? Does that (Q_ENUM) give a convenient wrapper?

[Gojir4]

@JonB You're right. I should have precised that Q_ENUM macro is required to register the enum in the Meta-Object system.
What do you mean by "a convenient wrapper" ?

[JonB]

@Gojir4
I don't do Qt C++. I didn't know whether you can make meta-object calls directly without the need for that macro. Or of course you could write the code directly, for all I know you might have said whatever the Q_ENUM macro is isn't a "convenient wrapper to access the meta-system" here, you don't like it or you don't want to have to write C++ to access from QML, or something like those.

[Babs]

@Gojir4 I define my enum class like this

class QTOBJECTDICTONNARY_EXPORT  CanOpenNmtCmdSpecifs {
    Q_GADGET

public:
    enum Enum {
        StartNode = 0x01,
        StopNode  = 0x02,
        SetPreOp  = 0x80,
        ResetNode = 0x81,
        ResetComm = 0x82,
    };
    Q_ENUM (Enum)
};
typedef CanOpenNmtCmdSpecifs::Enum CanOpenNmtCmdSpecif;

And try to expose it to QML in that way

qmlRegisterType<CanOpenNmtCmdSpecif>("NMTCmd",1,0,"NMTCmd");

The problem is that i get the error : staticMetaObject' is not a member of 'CanOpenNmtCmdSpecifs::Enum'
const char *className = T::staticMetaObject.className();
~~~~~~~~~~~~~~~~~~~~^
Is the Q_GADGET use instead of Q_OBJECT the probblem?

[Gojir4]

@Babs You're declaring the enum and not the type here:

qmlRegisterType<CanOpenNmtCmdSpecif>("NMTCmd",1,0,"NMTCmd");

Should not it be :

qmlRegisterType<CanOpenNmtCmdSpecifs>("NMTCmd",1,0,"NMTCmd");

Also I'm not sure it works with the typedef, and it's unecessary in c++ you can write.

 enum CanOpenNmtCmdSpecif{
        StartNode = 0x01,
        StopNode  = 0x02,
        SetPreOp  = 0x80,
        ResetNode = 0x81,
        ResetComm = 0x82,
    };
    Q_ENUM (CanOpenNmtCmdSpecif)

[Babs]

@Gojir4 Indeed the register doesn't work with typeDef. Thank you for your assistance.
Regards,

[Gojir4]

@Babs You're welcome ! Please don't forget to set the post as solved if your issue is fixed. Thanks !