private async Task ExecuteDeleteItemCommand(IAimTimerListItemViewModel aimTimerListItemViewModel)
 {
     if (await _alertManager.DisplayAlert("Warning!", "Would you like to remove the timer completely?", "Yes", "No"))
     {
         _aimTimerService.DeleteAimTimer(aimTimerListItemViewModel.GetAimTimerItem().AimTimer);
         AimTimerListItemViewModels.Remove(aimTimerListItemViewModel);
     }
 }
        private void OnItemUpdated(IAimTimerItem aimTimerItem)
        {
            var result = AimTimerListItemViewModels.FirstOrDefault(i => i.GetAimTimerItem() == aimTimerItem);

            if (result == null)
            {
                //_aimTimerNotificationService.Stop();
                result = _aimTimerItemViewModelFactory.Create(aimTimerItem);
                AimTimerListItemViewModels.Add(result);
                //_aimTimerNotificationService.Start();
            }
            result.Refresh();
        }
        public void Init()
        {
            //_aimTimerNotificationService.Stop();
            AimTimerListItemViewModels.CollectionChanged -= AimTimerItemViewModels_CollectionChanged;
            //_aimTimerNotificationService.OnStatusChanged -= AimTimerNotificationService_OnStatusChanged;
            _messagingCenter.Unsubscribe <IAimTimerItem>(this, MessagingCenterMessages.AimTimerUpdated);

            AimTimerListItemViewModels.Clear();
            foreach (var aimTimerItem in _aimTimerService.GetActiveAimTimers())
            {
                AimTimerListItemViewModels.Add(_aimTimerItemViewModelFactory.Create(aimTimerItem));
            }

            //_aimTimerNotificationService.SetItemsToFollow(AimTimerListItemViewModels.Select(i => i.GetAimTimerItem()).ToList());
            AimTimerListItemViewModels.CollectionChanged += AimTimerItemViewModels_CollectionChanged;
            //_aimTimerNotificationService.OnStatusChanged += AimTimerNotificationService_OnStatusChanged;
            //_aimTimerNotificationService.Start();
            _messagingCenter.Subscribe <IAimTimerItem>(this, MessagingCenterMessages.AimTimerUpdated, OnItemUpdated);

            InitTimer();

            OnPropertyChanged(nameof(Title));
        }