QGeoSatelliteInfoSource Class

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

Header: #include <QGeoSatelliteInfoSource>
qmake: QT += positioning
Since: Qt 5.2
Inherits: QObject

Public Types

enum Error { AccessError, ClosedError, NoError, UnknownSourceError }

Properties

  • 1 property inherited from QObject

Public Functions

QGeoSatelliteInfoSource(QObject *parent)
virtual ~QGeoSatelliteInfoSource()
virtual QGeoSatelliteInfoSource::Error error() const = 0
virtual int minimumUpdateInterval() const = 0
virtual void setUpdateInterval(int msec)
QString sourceName() const
int updateInterval() const
  • 31 public functions inherited from QObject

Public Slots

virtual void requestUpdate(int timeout = 0) = 0
virtual void startUpdates() = 0
virtual void stopUpdates() = 0
  • 1 public slot inherited from QObject

Signals

void error(QGeoSatelliteInfoSource::Error)
void requestTimeout()
void satellitesInUseUpdated(const QList<QGeoSatelliteInfo> &satellites)
void satellitesInViewUpdated(const QList<QGeoSatelliteInfo> &satellites)

Static Public Members

QStringList availableSources()
QGeoSatelliteInfoSource *createDefaultSource(QObject *parent)
QGeoSatelliteInfoSource *createSource(const QString &sourceName, QObject *parent)
const QMetaObject staticMetaObject
  • 9 static public members inherited from QObject

Additional Inherited Members

  • 9 protected functions inherited from QObject

Detailed Description

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

The static function QGeoSatelliteInfoSource::createDefaultSource() creates a default satellite data source that is appropriate for the platform, if one is available. Otherwise, available QGeoPositionInfoSourceFactory plugins will be checked for one that has a satellite data source available.

Call startUpdates() and stopUpdates() to start and stop regular updates, or requestUpdate() to request a single update. When an update is available, satellitesInViewUpdated() and/or satellitesInUseUpdated() will be emitted.

If regular satellite updates are required, setUpdateInterval() can be used to specify how often these updates should be emitted. If no interval is specified, updates are simply provided whenever they are available. For example:


  // Emit updates every 10 seconds if available
  QGeoSatelliteInfoSource *source = QGeoSatelliteInfoSource::createDefaultSource(0);
  if (source)
      source->setUpdateInterval(10000);

To remove an update interval that was previously set, call setUpdateInterval() with a value of 0.

Note that the satellite source may have a minimum value requirement for update intervals, as returned by minimumUpdateInterval().

Member Type Documentation

enum QGeoSatelliteInfoSource::Error

The Error enumeration represents the errors which can occur.

ConstantValueDescription
QGeoSatelliteInfoSource::AccessError0The connection setup to the satellite backend failed because the application lacked the required privileges.
QGeoSatelliteInfoSource::ClosedError1The satellite backend closed the connection, which happens for example in case the user is switching location services to off. This object becomes invalid and should be deleted. A new satellite source can be created by calling createDefaultSource() later on.
QGeoSatelliteInfoSource::NoError2No error has occurred.
QGeoSatelliteInfoSource::UnknownSourceError-1An unidentified error occurred.

Property Documentation

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:

virtual int minimumUpdateInterval() const = 0

updateInterval : int

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:

int updateInterval() const
virtual void setUpdateInterval(int msec)

Member Function Documentation

QGeoSatelliteInfoSource::QGeoSatelliteInfoSource(QObject *parent)

Creates a satellite source with the specified parent.

[virtual] 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.

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

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

Returns 0 if the plugin cannot be found.

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

[signal] void QGeoSatelliteInfoSource::error(QGeoSatelliteInfoSource::Error)

Note: Signal error is overloaded in this class. To connect to this signal by using the function pointer syntax, Qt provides a convenient helper for obtaining the function pointer as shown in this example:


  connect(geoSatelliteInfoSource, QOverload<QGeoSatelliteInfoSource::Error>::of(&QGeoSatelliteInfoSource::error),
      [=](QGeoSatelliteInfoSource::Error ){ /* ... */ });

[signal] void QGeoSatelliteInfoSource::requestTimeout()

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

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

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

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()

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