Interfaces between C++ and QML Code in Qt Positioning

Overview

Qt Positioning utilizes two methods to simplify exchange of position data between C++ and QML code.

Direct mapping

Qt Positioning allow you to pass the following value types from QML to C++, and vice versa:

QVariant Based integration

This section provides information on how to integrate QGeoAddress and QGeoLocation.

Address - QGeoAddress

The Address.address property is used to provide an interface between C++ and QML code. First a pointer to an Address object must be obtained from C++, then the property() and setProperty() functions must be used to get and set the address property.

The following piece of code gets the QGeoAddress object from C++:

 QGeoAddress geoAddress = qmlObject->property("address").value<QGeoAddress>();

The following piece of code sets the address property of the QML object based on a QGeoAddress object from C++:

qmlObject->setProperty("address", QVariant::fromValue(geoAddress));

Location - QGeoLocation

The Location.location property is used to provide an interface between C++ and QML code. First a pointer to a Location object must be obtained from C++, then the property() and setProperty() functions must be used to get and set the location property.

The following piece of code gets the QGeoLocation object from C++:

QGeoLocation geoLocation = qmlObject->property("location").value<QGeoLocation>();

The following piece of code sets the location property of the QML object based on a QGeoLocation object from C++:

qmlObject->setProperty("location", QVariant::fromValue(geoLocation));