refs #395, allow to disconnect SIGNAL/SLOTS from provider and gracefully shutdown airspace and analyzer

src/blackmisc/simulation/remoteaircraftprovider.h

@@ -27,6 +27,7 @@ namespace BlackMisc
         //! Direct thread safe in memory access to remote aircraft
         //! \note Can not be derived from QObject (as for the signals), as this would create multiple
         //!       inheritance. Hence Q_DECLARE_INTERFACE is used.
+        //! \ingroup remoteaircraftprovider
         class BLACKMISC_EXPORT IRemoteAircraftProvider
         {
         public:
@@ -106,6 +107,10 @@ namespace BlackMisc
                 std::function<void(const BlackMisc::Simulation::CAirspaceAircraftSnapshot &)> aircraftSnapshot
             ) = 0;
 
+            //! Disconnect signals from receiver. As the interface is no QObject, slots can not be connected directly.
+            virtual bool disconnectRemoteAircraftProviderSignals(
+                QObject *receiver
+            ) = 0;
         };
 
         //! Class which can be directly used to access an \sa IRemoteAircraftProvider object

src/blackmisc/simulation/remoteaircraftproviderdummy.cpp

@@ -80,6 +80,12 @@ namespace BlackMisc
             return s1 && s2 && s3 && s4;
         }
 
+        bool CRemoteAircraftProviderDummy::disconnectRemoteAircraftProviderSignals(QObject *receiver)
+        {
+            if (!receiver) { return false; }
+            return this->disconnect(receiver);
+        }
+
         bool CRemoteAircraftProviderDummy::updateAircraftEnabled(const CCallsign &callsign, bool enabledForRendering, const QString &originator)
         {
             Q_UNUSED(originator);

src/blackmisc/simulation/remoteaircraftproviderdummy.h

@@ -67,6 +67,9 @@ namespace BlackMisc
                 std::function<void(const BlackMisc::Simulation::CAirspaceAircraftSnapshot &)> aircraftSnapshotSlot
             ) override;
 
+            //! \copydoc IRemoteAircraftProvider::disconnectRemoteAircraftProviderSignals
+            virtual bool disconnectRemoteAircraftProviderSignals(QObject *receiver) override;
+
             //! \copydoc IRemoteAircraftProvider::updateAircraftEnabled
             virtual bool updateAircraftEnabled(const BlackMisc::Aviation::CCallsign &callsign, bool enabledForRendering, const QString &originator) override;