[platform] Separete the location_service lib

Signed-off-by: Ferenc Géczi <ferenc.gm@gmail.com>

platform/location_service/qt_location_service.hpp

@@ -0,0 +1,28 @@
+#pragma once
+
+#include "platform/location_service/location_service.hpp"
+
+#include <QGeoPositionInfoSource>
+
+class QtLocationService : public QObject, public location::LocationService
+{
+  Q_OBJECT
+  QGeoPositionInfoSource *m_positionSource;
+  // Unfortunately when the source is `geoclue2`
+  // we would need access to the `Active` D-Bus property
+  // https://www.freedesktop.org/software/geoclue/docs
+  // /gdbus-org.freedesktop.GeoClue2.Client.html#gdbus-property-org-freedesktop-GeoClue2-Client.Active
+  // But `QGeoPositionInfoSource` doesn't expose that so we have to deduce its state.
+  bool m_clientIsActive = false;
+
+public:
+  explicit QtLocationService(location::LocationObserver &, std::string const &);
+  virtual ~QtLocationService() {};
+  virtual void Start();
+  virtual void Stop();
+
+public slots:
+  void OnLocationUpdate(QGeoPositionInfo const &);
+  void OnErrorOccurred(QGeoPositionInfoSource::Error);
+  void OnSupportedPositioningMethodsChanged();
+};