QtSensors.creating-a-sensor-plugin

How a Sensor Plugin is Loaded

Since sensor backends are created on demand, the sensor plugin is loaded and asked to register the sensor backends it handles. The plugin should implement QSensorPluginInterface::registerSensors() and call QSensorManager::registerBackend() to register available backends. Typically the plugin will also inherit from QSensorBackendFactory and implement QSensorBackendFactory::createBackend() in order to instantiate backends it has registered.

The simplest plugin will have just once sensor backend although there is no reason that multiple sensor backends cannot be in a plugin.

An example follows.

class MyPluginClass : public QObject, public QSensorPluginInterface, public QSensorBackendFactory
{
Q_OBJECT
//Q_PLUGIN_METADATA(IID "com.qt-project.Qt.QSensorPluginInterface/1.0" FILE "plugin.json")
Q_INTERFACES(QSensorPluginInterface)
public:
void registerSensors()
{
QSensorManager::registerBackend(QAccelerometer::type, MyBackend::id, this);
}
QSensorBackend createBackend(QSensor sensor)
{
if (sensor->identifier() == MyBackend::id)
return new MyBackend(sensor);
return 0;
}
};