Can C++ signal be called from QML

Vinoth Rajendran4

class Hello : public QObject
{
    Q_OBJECT

signals:
    void sampleSignal();
};

// main.cpp
Hello obj;
engine.rootContext()->setContextProperty("Hello", (*QObject) (&obj));

// QML
MouseArea {
    anchors.fill: parent
    onClicked: {
       Hello.sampleSignal()
    }
}

I tried calling c++ signal from QML. Seems to be working fine. But i could not find any documentation for it.
So i just need to know, if this is valid ?

KroMignon

@Vinoth-Rajendran4 said in Can C++ signal be called from QML:

Can you please direct me to the documentation link if any available ?

Take a look at this: https://doc.qt.io/qt-5/qtqml-cppintegration-exposecppattributes.html#exposing-signals

Any public signal of a QObject-derived type is accessible from QML code.

The QML engine automatically creates a signal handler for any signal of a QObject-derived type that is used from QML. Signal handlers are always named on<Signal> where <Signal> is the name of the signal, with the first letter capitalized. All parameters passed by the signal are available in the signal handler through the parameter names.

sierdzio

@Vinoth-Rajendran4 said in Can C++ signal be called from QML:

So i just need to know, if this is valid ?

Yes.

Vinoth Rajendran4

@sierdzio : Thanks .. But i could not find any documentation regarding this. Can you please direct me to the documentation link if any available ?

KroMignon

@Vinoth-Rajendran4 said in Can C++ signal be called from QML:

Can you please direct me to the documentation link if any available ?

Take a look at this: https://doc.qt.io/qt-5/qtqml-cppintegration-exposecppattributes.html#exposing-signals

Any public signal of a QObject-derived type is accessible from QML code.

The QML engine automatically creates a signal handler for any signal of a QObject-derived type that is used from QML. Signal handlers are always named on<Signal> where <Signal> is the name of the signal, with the first letter capitalized. All parameters passed by the signal are available in the signal handler through the parameter names.