QGeoPositionInfoSource

The QGeoPositionInfoSource class is an abstract base class for the distribution of positional updates. More…

Inherited by: QNmeaPositionInfoSource

Synopsis

Functions

• def backendProperty (name)

• def preferredPositioningMethods ()

• def setBackendProperty (name, value)

• def sourceName ()

• def updateInterval ()

Virtual functions

• def error ()

• def lastKnownPosition ([fromSatellitePositioningMethodsOnly=false])

• def minimumUpdateInterval ()

• def requestUpdate ([timeout=0])

• def setPreferredPositioningMethods (methods)

• def setUpdateInterval (msec)

• def startUpdates ()

• def stopUpdates ()

• def supportedPositioningMethods ()

Signals

• def error (arg__1)

• def positionUpdated (update)

• def supportedPositioningMethodsChanged ()

• def updateTimeout ()

Static functions

• def availableSources ()

• def createDefaultSource (parameters, parent)

• def createDefaultSource (parent)

• def createSource (sourceName, parameters, parent)

• def createSource (sourceName, parent)

Detailed Description

The static function createDefaultSource() creates a default position source that is appropriate for the platform, if one is available. Otherwise, QGeoPositionInfoSource will check for available plugins that implement the QGeoPositionInfoSourceFactory interface.

Users of a QGeoPositionInfoSource subclass can request the current position using requestUpdate() , or start and stop regular position updates using startUpdates() and stopUpdates() . When an update is available, positionUpdated() is emitted. The last known position can be accessed with lastKnownPosition() .

If regular position 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
QGeoPositionInfoSource *source = QGeoPositionInfoSource::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 position source may have a minimum value requirement for update intervals, as returned by minimumUpdateInterval() .

class PySide2.QtPositioning.QGeoPositionInfoSource(parent)

param parent:

PySide2.QtCore.QObject

Creates a position source with the specified parent .

PySide2.QtPositioning.QGeoPositionInfoSource.Error

The Error enumeration represents the errors which can occur.

Constant	Description
QGeoPositionInfoSource.AccessError	The connection setup to the remote positioning backend failed because the application lacked the required privileges.
QGeoPositionInfoSource.ClosedError	The remote positioning backend closed the connection, which happens for example in case the user is switching location services to off. As soon as the location service is re-enabled regular updates will resume.
QGeoPositionInfoSource.NoError	No error has occurred.
QGeoPositionInfoSource.UnknownSourceError	An unidentified error occurred.

PySide2.QtPositioning.QGeoPositionInfoSource.PositioningMethod

Defines the types of positioning methods.

Constant	Description
QGeoPositionInfoSource.NoPositioningMethods	None of the positioning methods.
QGeoPositionInfoSource.SatellitePositioningMethods	Satellite-based positioning methods such as GPS or GLONASS.
QGeoPositionInfoSource.NonSatellitePositioningMethods	Other positioning methods such as 3GPP cell identifier or WiFi based positioning.
QGeoPositionInfoSource.AllPositioningMethods	Satellite-based positioning methods as soon as available. Otherwise non-satellite based methods.

static PySide2.QtPositioning.QGeoPositionInfoSource.availableSources()

Return type:

list of strings

Returns a list of available source plugins. This includes any default backend plugin for the current platform.

PySide2.QtPositioning.QGeoPositionInfoSource.backendProperty(name)

Parameters:

name – str

Return type:

object

Returns the value of the backend-specific property named name , if present. Otherwise, the returned value will be invalid. Supported backend-specific properties are listed and described in Qt Positioning plugins#Default plugins .

See also

setBackendProperty

static PySide2.QtPositioning.QGeoPositionInfoSource.createDefaultSource(parent)

Parameters:

parent – PySide2.QtCore.QObject

Return type:

PySide2.QtPositioning.QGeoPositionInfoSource

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

Returns 0 if the system has no default position source, no valid plugins could be found or the user does not have the permission to access the current position.

static PySide2.QtPositioning.QGeoPositionInfoSource.createDefaultSource(parameters, parent)

Parameters:

• parameters –

• parent – PySide2.QtCore.QObject

Return type:

PySide2.QtPositioning.QGeoPositionInfoSource

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

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

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

static PySide2.QtPositioning.QGeoPositionInfoSource.createSource(sourceName, parent)

Parameters:

• sourceName – str

• parent – PySide2.QtCore.QObject

Return type:

PySide2.QtPositioning.QGeoPositionInfoSource

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

Returns 0 if the plugin cannot be found.

static PySide2.QtPositioning.QGeoPositionInfoSource.createSource(sourceName, parameters, parent)

Parameters:

• sourceName – str

• parameters –

• parent – PySide2.QtCore.QObject

Return type:

PySide2.QtPositioning.QGeoPositionInfoSource

Creates and returns a position 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.

PySide2.QtPositioning.QGeoPositionInfoSource.error()

Return type:

Error

Returns the type of error that last occurred.

PySide2.QtPositioning.QGeoPositionInfoSource.error(arg__1)

Parameters:

arg__1 – Error

PySide2.QtPositioning.QGeoPositionInfoSource.lastKnownPosition([fromSatellitePositioningMethodsOnly=false])

Parameters:

fromSatellitePositioningMethodsOnly – bool

Return type:

PySide2.QtPositioning.QGeoPositionInfo

Returns an update containing the last known position, or a null update if none is available.

If fromSatellitePositioningMethodsOnly is true, this returns the last known position received from a satellite positioning method; if none is available, a null update is returned.

PySide2.QtPositioning.QGeoPositionInfoSource.minimumUpdateInterval()

Return type:

int

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

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

PySide2.QtPositioning.QGeoPositionInfoSource.positionUpdated(update)

Parameters:

update – PySide2.QtPositioning.QGeoPositionInfo

PySide2.QtPositioning.QGeoPositionInfoSource.preferredPositioningMethods()

Return type:

PositioningMethods

Returns the positioning methods set by setPreferredPositioningMethods() .

See also

setPreferredPositioningMethods()

PySide2.QtPositioning.QGeoPositionInfoSource.requestUpdate([timeout=0])

Parameters:

timeout – int

Attempts to get the current position and emit positionUpdated() with this information. If the current position cannot be found within the given timeout (in milliseconds) or if timeout is less than the value returned by minimumUpdateInterval() , updateTimeout() 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.

If the source uses multiple positioning methods, it tries to get the current position from the most accurate positioning method within the given timeout.

PySide2.QtPositioning.QGeoPositionInfoSource.setBackendProperty(name, value)

Parameters:

• name – str

• value – object

Return type:

bool

Sets the backend-specific property named name to value . Returns true on success, false otherwise. Backend-specific properties can be used to configure the positioning subsystem behavior at runtime. Supported backend-specific properties are listed and described in Qt Positioning plugins#Default plugins .

See also

backendProperty

PySide2.QtPositioning.QGeoPositionInfoSource.setPreferredPositioningMethods(methods)

Parameters:

methods – PositioningMethods

Sets the preferred positioning methods for this source to methods .

If methods includes a method that is not supported by the source, the unsupported method will be ignored.

If methods does not include a single method available/supported by the source, the preferred methods will be set to the set of methods which the source has available. If the source has no method availabe (e.g. because its Location service is turned off or it does not offer a Location service), the passed methods are accepted as they are.

Note

When reimplementing this method, subclasses must call the base method implementation to ensure preferredPositioningMethods() returns the correct value.

See also

preferredPositioningMethods() supportedPositioningMethods()

PySide2.QtPositioning.QGeoPositionInfoSource.setUpdateInterval(msec)

Parameters:

msec – int

This property holds 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 so that returns the correct value.

PySide2.QtPositioning.QGeoPositionInfoSource.sourceName()

Return type:

str

This property holds This property holds the unique name of the position 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 position source implementation.

PySide2.QtPositioning.QGeoPositionInfoSource.startUpdates()

Starts emitting updates at regular intervals as specified by setUpdateInterval() .

If setUpdateInterval() has not been called, the source will emit updates as soon as they become available.

An updateTimeout() signal will be emitted if this QGeoPositionInfoSource subclass determines that it will not be able to provide regular updates. This could happen if a satellite fix is lost or if a hardware error is detected. Position updates will recommence if the data becomes available later on. The updateTimeout() signal will not be emitted again until after the periodic updates resume.

On iOS, starting from version 8, Core Location framework requires additional entries in the application’s Info.plist with keys NSLocationAlwaysUsageDescription or NSLocationWhenInUseUsageDescription and a string to be displayed in the authorization prompt. The key NSLocationWhenInUseUsageDescription is used when requesting permission to use location services while the app is in the foreground. The key NSLocationAlwaysUsageDescription is used when requesting permission to use location services whenever the app is running (both the foreground and the background). If both entries are defined, NSLocationWhenInUseUsageDescription has a priority in the foreground mode.

PySide2.QtPositioning.QGeoPositionInfoSource.stopUpdates()

Stops emitting updates at regular intervals.

PySide2.QtPositioning.QGeoPositionInfoSource.supportedPositioningMethods()

Return type:

PositioningMethods

Returns the positioning methods available to this source. Availability is defined as being usable at the time of calling this function. Therefore user settings like turned off location service or limitations to Satellite-based position providers are reflected by this function. Runtime notifications when the status changes can be obtained via supportedPositioningMethodsChanged() .

Not all platforms distinguish the different positioning methods or communicate the current user configuration of the device. The following table provides an overview of the current platform situation:

Platform	Brief Description
Android	Individual provider status and general Location service state are known and communicated when location service is active.
GeoClue	Hardcoced to always return AllPositioningMethods .
GeoClue2	Individual providers are not distinguishable but disabled Location services reflected.
iOS/tvOS	Hardcoced to always return AllPositioningMethods .
macOS	Hardcoced to always return AllPositioningMethods .
Windows (UWP)	Individual providers are not distinguishable but disabled Location services reflected.

See also

supportedPositioningMethodsChanged() setPreferredPositioningMethods()

PySide2.QtPositioning.QGeoPositionInfoSource.supportedPositioningMethodsChanged()

PySide2.QtPositioning.QGeoPositionInfoSource.updateInterval()

Return type:

int

This property holds 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 so that returns the correct value.

PySide2.QtPositioning.QGeoPositionInfoSource.updateTimeout()