private void HandleCounter(AggregatedMessageCounter sender)
{
if (_counter.HasMessages)
{
var indicator = GetOrCreateIndicator();
if (indicator == null) return;
indicator.Visibility = Visibility.Visible;
}
else
{
if (_indicator == null) return;
_indicator.Visibility = Visibility.Collapsed;
}
}
public void StartListen()
{
_aggregatedCounter = CreateAggregatedCounter();
_interlocutorUnit = ModelContext
.Interlocutors
.HandleCollectionChanges(initialOrAdd: interlocutor =>
{
if (_counters.ContainsKey(interlocutor))
{
return;
}
var counter = new UnreadMessageCounter(interlocutor, this);
_counters.Add(interlocutor, counter);
Feed.Subscribe(counter);
}, removed: interlocutor =>
{
if (!_counters.ContainsKey(interlocutor)) return;
var counter = _counters[interlocutor];
foreach (var msg in counter.TrackingMessages.ToList())
{
MarkAsRead(msg);
}
Feed.Unsubscribe(counter);
_counters.Remove(interlocutor);
});
}
public void Initialize()
{
_counter = StateManager.AggregatedCounter;
_counterUnit = _counter.SubscribeToChange(() => _counter.HasMessages, HandleCounter);
}
private AggregatedMessageCounter CreateAggregatedCounter()
{
var counter = new AggregatedMessageCounter();
Feed.Subscribe(counter);
return counter;
}