non-Q_OBJECT/Q_GADGET based template class registration in QML

[semlanik]

Hi all,

I would like to register non-Q_OBJECT/Q_GADGET class in qml. In fact it's template class that wraps int32/64.
I started investigating arround QQmlValueTypeProvider, but seems didn't make all neccessary registrations.

Here is code https://git.semlanik.org/semlanik/qtprotobuf/src/dev_semlanik

This line examples/simplechat/main.qml:125 is trying to assign property of type qtprotobuf::fixed32 and as expected throws:
qrc:/main.qml:125 Invalid property assignment: unsupported type "qtprotobuf::fixed32"

What are preconditions for MetaType to be accessible out of QQmlValueTypeProvider?

Thank you in advance.

Regards,
Alexey.

PS: Yes I know that there are some "public" ways to handle this, but it's on my own to support it in future.

[KroMignon]

@semlanik As far as I know, only QObject derived classes can be registered to QML => Registering C++ Types with the QML Type System

[semlanik]

@KroMignon, you are partially right, using public API yes, it's only possible to register classes with generated staticMetaObject. But there are hidden ways as always. One of examples QVector3D, I tried to reproduce stuff applied on QVector3D, but it doesn't work for me.

[semlanik]

@semlanik seems QQmlMetaType::registerCustomStringConverter solved my issue. Will dig deeper into QQmlValueTypeProvider, later.