How to call a QML function from c++ in BB10

First, not clear on BB10, what i know is on desktop, but the method maybe no difference;

two way:

1) signal and slot; refer to http://qt-project.org/doc/qt-4.8/qtbinding.html#receiving-signals

2) metaObject

example(qt 4.8):

you would need an ID in your QML element, so that we can get the object in C++:

QDeclarativeView* mpView = //get view from whatever function QObject *rootObject = mpView->rootObject(); //this is the rootObject of QML view QObject *obj = rootObject->findChild<QObject *>(/*your element ID*/); if (obj != NULL) { QVariant data = // what you need put in; bool ret = QMetaObject::invokeMethod(obj, "loadingData", Q_ARG(QVariant, data)); if (!ret) QDebug<<"invoke failure."; } 

You can access property of QML element from C++ easily, but calling function is going to be difficult.

But instead you can emit a signal from c++ and connect a function in qml to signal and execute required code there.

Expose C++ object to QML

qmlDocument->setContextProperty("_someClass", someClass); 

which has signal defined say someSignal()

When ever you need to call QML function , emit someSignal()

emit someSignal() 

In QML connect function to C++ signal

someClass.someSignal.connect(qmlFunction); function qmlFunction() { ... } 

You can find details information here.