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
- minimumUpdateInterval : const int
- updateInterval : int
- 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) |
- 2 signals inherited from QObject
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.
Constant | Value | Description |
---|---|---|
QGeoSatelliteInfoSource::AccessError | 0 | The connection setup to the satellite backend failed because the application lacked the required privileges. |
QGeoSatelliteInfoSource::ClosedError | 1 | The 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::NoError | 2 | No error has occurred. |
QGeoSatelliteInfoSource::UnknownSourceError | -1 | An 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.