QGeoPositionInfoSource ¶

概要 ¶

详细描述 ¶

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 接口。

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 QGeoPositionInfoSource ( parent ) ¶

param parent

QObject

Creates a position source with the specified parent .

PySide2.QtPositioning.QGeoPositionInfoSource. Error ¶

The Error enumeration represents the errors which can occur.

常量	描述
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	没有发生错误。
QGeoPositionInfoSource.UnknownSourceError	发生无法识别的错误。

PySide2.QtPositioning.QGeoPositionInfoSource. PositioningMethod ¶

Defines the types of positioning methods.

常量	描述
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 ( ) ¶

返回类型

字符串列表

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

PySide2.QtPositioning.QGeoPositionInfoSource. backendProperty ( name ) ¶

参数

name – unicode

返回类型

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 .

另请参阅

setBackendProperty

static PySide2.QtPositioning.QGeoPositionInfoSource. createDefaultSource ( parent ) ¶

参数

parent – QObject

返回类型

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 ( 参数 , parent ) ¶

参数

• 参数 –

• parent – QObject

返回类型

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 参数 to the factory to configure the source.

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

参数

• sourceName – unicode

• parent – QObject

返回类型

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 , 参数 , parent ) ¶

参数

• sourceName – unicode

• 参数 –

• parent – QObject

返回类型

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 参数 to the factory to configure the source.

PySide2.QtPositioning.QGeoPositionInfoSource. error ( ) ¶

返回类型

Error

返回最后发生的错误类型。

PySide2.QtPositioning.QGeoPositionInfoSource. error ( arg__1 ) ¶

参数

arg__1 – Error

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

参数

fromSatellitePositioningMethodsOnly – bool

返回类型

QGeoPositionInfo

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

若 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 ( ) ¶

返回类型

int

PySide2.QtPositioning.QGeoPositionInfoSource. positionUpdated ( update ) ¶

参数

update – QGeoPositionInfo

PySide2.QtPositioning.QGeoPositionInfoSource. preferredPositioningMethods ( ) ¶

返回类型

PositioningMethods

Returns the positioning methods set by setPreferredPositioningMethods() .

另请参阅

setPreferredPositioningMethods()

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

参数

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 ) ¶

参数

• name – unicode

• value – object

返回类型

bool

Sets the backend-specific property named name to value 。返回 true 当成功时， 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 .

另请参阅

backendProperty

PySide2.QtPositioning.QGeoPositionInfoSource. setPreferredPositioningMethods ( methods ) ¶

参数

methods – PositioningMethods

Sets the preferred positioning methods for this source to methods .

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

若 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.

注意

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

另请参阅

preferredPositioningMethods() supportedPositioningMethods()

PySide2.QtPositioning.QGeoPositionInfoSource. setUpdateInterval ( msec ) ¶

参数

msec – int

另请参阅

updateInterval()

PySide2.QtPositioning.QGeoPositionInfoSource. sourceName ( ) ¶

返回类型

unicode

PySide2.QtPositioning.QGeoPositionInfoSource. startUpdates ( ) ¶

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

若 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 ( ) ¶

返回类型

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:

平台	简要描述
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.

另请参阅

supportedPositioningMethodsChanged() setPreferredPositioningMethods()

PySide2.QtPositioning.QGeoPositionInfoSource. supportedPositioningMethodsChanged ( ) ¶

PySide2.QtPositioning.QGeoPositionInfoSource. updateInterval ( ) ¶

返回类型

int

另请参阅

setUpdateInterval()

PySide2.QtPositioning.QGeoPositionInfoSource. updateTimeout ( ) ¶