Qt Positioning Plugins
Qt Positioning provides the majority of its functionality through plugins. This document outlines how to develop a new position plugin.
Default plugins
Some plugins already ship with Qt. These are:
android | Wraps Android positioning subsystem. Available only on Android. |
corelocation | A Core Location backend wraps iOS and macOS positioning subsystems. Available only on Apple platforms supporting corelocation. |
geoclue2 | A GeoClue v2 backend that provides an interface to the GeoClue v2 D-Bus service. |
gypsy | A Gypsy backend that provides an interface to the Gypsy daemon. |
winrt | Wraps WinRT positioning subsystem. Available only on WinRT and Windows10. |
nmea | An NMEA backend that parses NMEA streams from a GPS receiver to provide position updates. This plugin can use serial port, socket or file as a source. |
positionpoll | A backend providing only area monitoring functionalities via polling on position updates. |
Plugin Description
Each plugin is described by a json file. The json describes the plugins capabilities and version. Below is an example of a json file used by the postionpoll plugin:
{ "Keys": ["positionpoll"], "Provider": "positionpoll", "Position": false, "Satellite": false, "Monitor": true, "Priority": 1000, "Testable": true }
The entries have the following meaning:
Key | Description |
---|---|
Keys | The unique name/key of the plugin. Each position plugin must have a unique name. |
Provider | The provider name of the services. Multiple plugins may have the same name. In such cases the Version string will be used to further distinguish the plugins. |
Position | Set to true if the plugin implements a QGeoPositionInfoSource. |
Satellite | Set to true if the plugin implements a QGeoSatelliteInfoSource. |
Monitor | Set to true if the plugin implements a QGeoAreaMonitorSource. |
Priority | The plugin priority. If multiple plugins have the same provider name, the plugin with the higest priority will be used. |
Implementing Plugins
A plugin implementer needs to subclass QGeoPositionInfoSourceFactory and override one or more of its functions. If a plugin does not support a specific feature the function should return 0 or utilize the default implementation.
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