Qt Positioning provides the majority of its functionality through plugins. This document outlines how to develop a new position plugin.
Some plugins already ship with Qt. These are:
| android | Wraps Android positioning subsystem. Available only on Android. |
| corelocation | 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. |
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. |
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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