/// <summary>
/// Register the given observer
/// </summary>
public void Attach(IFieldsObserver observer)
{
if (observer == null)
{
return;
}
List <IFieldsObserver> observers;
if (!_fieldsObservers.TryGetValue(observer.EntityType, out observers))
{
observers = new List <IFieldsObserver>();
_fieldsObservers[observer.EntityType] = observers;
}
// since we are using the same window for displaying
var existingObserver = observers.FirstOrDefault(o => o.Id == observer.Id);
if (existingObserver != null)
{
observers.Remove(existingObserver);
}
observers.Add(observer);
}
/// <summary>
/// Unregister the given observer
/// </summary>
public void Detach(IFieldsObserver observer)
{
if (observer == null)
{
return;
}
List <IFieldsObserver> observers;
if (!_fieldsObservers.TryGetValue(observer.EntityType, out observers))
{
return;
}
observers.Remove(observer);
if (observers.Count == 0)
{
_fieldsObservers.Remove(observer.EntityType);
}
}