QGeoSatelliteInfoSource Class | Qt Positioning (original) (raw)

The QGeoSatelliteInfoSource class is an abstract base class for the distribution of satellite information updates. More...

Property Documentation

[read-only] minimumUpdateInterval : const int

This property holds the minimum time (in milliseconds) required to retrieve a satellite update.

This is the minimum value accepted by setUpdateInterval() and requestUpdate().

Access functions:

[bindable] updateInterval : int

Note: This property supports QProperty bindings.

This property holds the requested interval in milliseconds between each update.

If the update interval is not set (or is set to 0) the source will provide updates as often as necessary.

If the update interval is set, the source will provide updates at an interval as close to the requested interval as possible. If the requested interval is less than the minimumUpdateInterval(), the minimum interval is used instead.

Changes to the update interval will happen as soon as is practical, however the time the change takes may vary between implementations. Whether or not the elapsed time from the previous interval is counted as part of the new interval is also implementation dependent.

The default value for this property is 0.

Note: Subclass implementations must call the base implementation of setUpdateInterval() so that updateInterval() returns the correct value.

Access functions:

Member Function Documentation

[virtual noexcept] QGeoSatelliteInfoSource::~QGeoSatelliteInfoSource()

Destroys the satellite source.

[static] QStringList QGeoSatelliteInfoSource::availableSources()

Returns a list of available source plugins, including the default system backend if one is available.

[virtual, since 6.2] QVariant QGeoSatelliteInfoSource::backendProperty(const QString &name) const

Returns the value of the backend-specific property named name, if present. Otherwise the returned value will be invalid.

This function was introduced in Qt 6.2.

See also setBackendProperty.

[static] QGeoSatelliteInfoSource *QGeoSatelliteInfoSource::createDefaultSource(QObject *parent)

Creates and returns a source with the specified parent that reads from the system's default source of satellite update information, or the highest priority available plugin.

Returns nullptr if the system has no default satellite source, no valid plugins could be found or the user does not have the permission to access the satellite data.

[static, since Qt 5.14] QGeoSatelliteInfoSource *QGeoSatelliteInfoSource::createDefaultSource(const QVariantMap &parameters, QObject *parent)

Creates and returns a satellite source with the given parent that reads from the system's default sources of satellite data, or the plugin with the highest available priority.

Returns nullptr if the system has no default satellite source, no valid plugins could be found or the user does not have the permission to access the satellite information.

This method passes parameters to the factory to configure the source.

This function was introduced in Qt 5.14.

[static] QGeoSatelliteInfoSource *QGeoSatelliteInfoSource::createSource(const QString &sourceName, QObject *parent)

Creates and returns a source with the given parent, by loading the plugin named sourceName.

Returns nullptr if the plugin cannot be found.

[static, since Qt 5.14] QGeoSatelliteInfoSource *QGeoSatelliteInfoSource::createSource(const QString &sourceName, const QVariantMap &parameters, QObject *parent)

Creates and returns a satellite source with the given parent, by loading the plugin named sourceName.

Returns nullptr if the plugin cannot be found.

This method passes parameters to the factory to configure the source.

This function was introduced in Qt 5.14.

[pure virtual] QGeoSatelliteInfoSource::Error QGeoSatelliteInfoSource::error() const

Returns the last error that occurred.

[signal] void QGeoSatelliteInfoSource::errorOccurred(QGeoSatelliteInfoSource::Error satelliteError)

This signal is emitted after an error occurred. The satelliteError parameter describes the type of error that occurred.

[pure virtual slot] void QGeoSatelliteInfoSource::requestUpdate(int timeout = 0)

Attempts to get the current satellite information and emit satellitesInViewUpdated() and satellitesInUseUpdated() with this information. If the current satellite information cannot be found within the given timeout (in milliseconds) or if timeout is less than the value returned by minimumUpdateInterval(), an errorOccurred() signal with UpdateTimeoutError is emitted.

If the timeout is zero, the timeout defaults to a reasonable timeout period as appropriate for the source.

This does nothing if another update request is in progress. However it can be called even if startUpdates() has already been called and regular updates are in progress.

Note: Since Qt6 this method always resets the last error to NoError before requesting the satellite information.

[signal] void QGeoSatelliteInfoSource::satellitesInUseUpdated(const QList<QGeoSatelliteInfo> &satellites)

If startUpdates() or requestUpdate() is called, this signal is emitted when an update is available on the number of satellites that are currently in use.

These are the satellites that are used to get a "fix" - that is, those used to determine the current position.

The satellites parameter holds the satellites currently in use.

[signal] void QGeoSatelliteInfoSource::satellitesInViewUpdated(const QList<QGeoSatelliteInfo> &satellites)

If startUpdates() or requestUpdate() is called, this signal is emitted when an update is available on the satellites that are currently in view.

The satellites parameter holds the satellites currently in view.

[virtual, since 6.2] bool QGeoSatelliteInfoSource::setBackendProperty(const QString &name, const QVariant &value)

Sets the backend-specific property named name to value. Returns true on success, false otherwise. Backend-specific properties can be used to configure the satellite info subsystem behavior at runtime.

This function was introduced in Qt 6.2.

See also backendProperty.

QString QGeoSatelliteInfoSource::sourceName() const

Returns the unique name of the satellite source implementation in use.

This is the same name that can be passed to createSource() in order to create a new instance of a particular satellite source implementation.

[pure virtual slot] void QGeoSatelliteInfoSource::startUpdates()

Starts emitting updates at regular intervals. The updates will be provided whenever new satellite information becomes available.

If satellite information cannot be retrieved or some other form of timeout has occurred the satellitesInViewUpdated() and satellitesInUseUpdated() signals may be emitted with empty parameter lists.

Note: Since Qt6 this method always resets the last error to NoError before starting the updates.

See also satellitesInViewUpdated() and satellitesInUseUpdated().

[pure virtual slot] void QGeoSatelliteInfoSource::stopUpdates()

Stops emitting updates at regular intervals.