public RestoraniViewModel()
 {
     //postavljanje komandi
     SearchCommand = new RelayCommand<object>(obaviSearch, mozelSearch);
     //lambda funkcije iz RPR da se ne prave metode za minorne stvari
     OpenSearchCommand = new RelayCommand<object>((object parametar) => SearchMode = true, (object parametar) => true);
     CloseSearchCommand = new RelayCommand<object>((object parametar) => SearchMode = false, (object parametar) => true);
     Restorani = new ObservableCollection<Restoran>();
     RestoraniDS = new RestoranDataSource();
     SearchOpcije = new SearchOpcije();
     //defaultne opcije da ima nekih restorana
     SearchOpcije.GeoSirina = 40.7;
     SearchOpcije.GeoDuzina = -74;
     //povuci restorane i kad se obavi upit, pozovi restorani loaded
     RestoraniDS.dajRestoraneFourSquare(SearchOpcije,RestoraniLoaded);
 }
 public async void dajRestoraneFourSquare(SearchOpcije so, Action callback)
 {
     Restorani = new List<Restoran>();
     //povuci opcije iz json file
     JsonObject servicesConfig = JsonValue.Parse(File.ReadAllText("ServicesConfig.json")).GetObject();
     //samo jednom ide registracija
     if (con == null)
     {
         con = new FourSqareConnector(servicesConfig.GetNamedObject("FourSquareApiService").GetNamedObject("options"));
         await con.authenticate();
     }
     VenService = new VenusService(con.OAuthToken);
     await VenService.getVenus(so.GeoSirina, so.GeoDuzina);
     foreach(Venue v in VenService.Venues)
     {
         Restorani.Add(new Restoran(v));
     }
     callback();
 }