Return qml component from c++ function

[Redman]

Hello,

I have a C++ class which acts as a factory, creating two different classes which implement the same interface.

I already registered that factory as a singleton via QML_ELEMENT QML_SINGLETON which works perfectly. Now I want to call my create function , which returns the correct implementation, from qml.

Is this possible? If so, how?

[Bob64]

@Redman these C++ classes that implement the same interface - how do you want to use them in your QML? Where would the factory fit in on the QML side?

[GrecKo]

@Redman make the create function Q_INVOKABLE : Exposing Methods (Including Qt Slots)

[Axel Spoerl]

@GrecKo
So create() is supposed to return instances of other C++ classes, that are exposed to QML, just not as singletons?

I assume that you are familiar with this, since you have already succeeded with your singleton.

You need to expose the other classes just like the factory. As @GrecKo said, you implement a

Q_INVOKABLE NewClass *Factory::create(MaybeAnEnum type)
{
    switch (type) {
    case Redman: return new NewClassRedMan;
    case GrecKo: return new NewClassGrecKo;
    case Axel: return new NewClassAxel;
    }
}

To use it in QML, define a property of the appropriate type and assign the return value of create().

Rectangle {
    id: window
    property QtObject myClass: mySingleton.create(Redman)
}

[Mesrine]

@Redman said in Return qml component from c++ function:

Are you referring to
T*create(QQmlEngine *, QJSEngine *) function
from this docs ?