Implement followAircraft for X-Plane

ref T266

src/xswiftbus/org.swift_project.xswiftbus.traffic.xml

@@ -78,5 +78,8 @@ R"(<node>
       <arg type="s" direction="out"/>
       <arg type="d" direction="out"/>
     </method>
+    <method name="setFollowedAircraft">
+       <arg name="callsign" type="s" direction="in"/>
+    </method>
   </interface>
 </node>)"

src/xswiftbus/traffic.cpp

@@ -393,6 +393,14 @@ namespace XSwiftBus
         }
     }
 
+    void CTraffic::setFollowedAircraft(const std::string &callsign)
+    {
+        auto planeIt = m_planesByCallsign.find(callsign);
+        if (planeIt == m_planesByCallsign.end()) { return; }
+
+        orbitRemotePlane(callsign);
+    }
+
     const char *introspection_traffic =
         DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
 #include "org.swift_project.xswiftbus.traffic.xml"
@@ -655,6 +663,17 @@ namespace XSwiftBus
                     ;                   sendDBusMessage(reply);
                 });
             }
+            else if (message.getMethodName() == "setFollowedAircraft")
+            {
+                maybeSendEmptyDBusReply(wantsReply, sender, serial);
+                std::string callsign;
+                message.beginArgumentRead();
+                message.getArgument(callsign);
+                queueDBusCall([ = ]()
+                {
+                    setFollowedAircraft(callsign);
+                });
+            }
             else
             {
                 // Unknown message. Tell DBus that we cannot handle it

src/xswiftbus/traffic.h

@@ -114,6 +114,9 @@ namespace XSwiftBus
         //! Get the ground elevation at an arbitrary position
         double getEelevationAtPosition(const std::string &callsign, double latitude, double longitude, double altitude);
 
+        //! Sets the aircraft with callsign to be followed in plane view
+        void setFollowedAircraft(const std::string &callsign);
+
         int processDBus() override;
 
     protected: