Qml Singleton Wrapper for Q_Gadget Base-Type with static Q_INVOKABLE functions

[Konstantin Schraubek]

Hey guys,

is there a way to do make a Qml Singleton Wrapper for a Q_GADGET class (not inherinting from QObject) and be able to call static Q_INVOKABLE marked functions (from Base Class) from Qml?
Goal is to not bloat the c++ api with all that QObject inherited functions but have same naming and all between qml/c++. That means the base class cant inherint from QObject - with QObject inherintacne in the base class it would probalby work by exposing the base class directly to qml.

Basic Idea is:

class BasicConversions
{
	Q_GADGET
		
	public:
		Q_INVOKABLE static double DegreesToMil(int degrees);
		Q_INVOKABLE static double DegreesToMil(double degrees);
		
};

namespace MathQml
{
	class BasicConversionsQml : public QObject, public BasicConversions
	{
		Q_OBJECT
	public:
		    static QObject* qmlInstance(QQmlEngine* engine, QJSEngine* scriptEngine);
	};
}

qmlRegisterSingletonType<MathQml::BasicConversionsQml>("Math", 1, 0, "BasicConversions", &MathQml::BasicConversionsQml::qmlInstance);

[Maximilian Goldstein]

Hi,

I'm afraid exposing the Q_GADGET as a singleton directly just isn't an option.

You may either expose it as an Q_PROPERTY of a QObject or write a wrapper QObject class that has the same Q_INVOKABLEs and then calls the version of the Q_GADGET class internally (this will obviously require adjustments if you decide to change or extend your Q_GADGET class itself).

Hope one of these alternatives is viable for you.