private void OnPropertyChanged(object sender, PropertyChangedEventArgs args)
{
ForEachCallback(args.PropertyName, (callbacksForProperty, currentNode) =>
{
IWeakEventCallback <PropertyChangedEventArgs> callback = (IWeakEventCallback <PropertyChangedEventArgs>)currentNode.Value;
if (!callback.Invoke(sender, args))
{
callbacksForProperty.MarkForRemove(currentNode);
}
return(true);
});
}
private void OnPropertyChanging(object sender, PropertyChangingEventArgs args)
{
//var callbacksForProperty = LookupCallbacksForProperty(args.PropertyName);
//if (callbacksForProperty == null)
//{
// return;
//}
//ulong version = callbacksForProperty.Version;
//var currentNode = callbacksForProperty.StartIterating(version);
//try
//{
// while (currentNode != null)
// {
// IWeakEventCallback<PropertyChangingEventArgs> callback = currentNode.Value as IWeakEventCallback<PropertyChangingEventArgs>;
// if (callback != null)
// {
// if (!callback.Invoke(sender, args))
// {
// callbacksForProperty.MarkForRemove(currentNode);
// }
// }
// currentNode = callbacksForProperty.GetNext(version, currentNode);
// }
//}
//finally
//{
// callbacksForProperty.StopIterating();
//}
ForEachCallback(args.PropertyName, (callbacksForProperty, currentNode) =>
{
IWeakEventCallback <PropertyChangingEventArgs> callback = currentNode.Value as IWeakEventCallback <PropertyChangingEventArgs>;
if (callback != null)
{
if (!callback.Invoke(sender, args))
{
callbacksForProperty.MarkForRemove(currentNode);
}
}
return(true);
});
}
public void RemoveListener(object listener, string propertyName, object rootSubject)
{
ForEachCallback(propertyName, (callbacksForProperty, currentNode) =>
{
IWeakEventCallback <PropertyChangedEventArgs> callback = (IWeakEventCallback <PropertyChangedEventArgs>)currentNode.Value;
object listenerForCallback = callback.ListenerReference.Target;
object rootSubjectForCallback = callback.RootSubject.Target;
if (listenerForCallback == null)
{
callbacksForProperty.MarkForRemove(currentNode);
}
else if (listenerForCallback == listener && rootSubject == rootSubjectForCallback)
{
callbacksForProperty.MarkForRemove(currentNode);
return(false);
}
return(true);
});
}
public Guid Register(IWeakEventCallback callback)
{
if (callback == null)
{
return Guid.Empty;
}
var id = Guid.NewGuid();
_references[id] = new WeakReference<IWeakEventCallback>(callback);
return id;
}
/// <summary>
/// Register callback.
/// </summary>
/// <param name="callback">Weak event callback.</param>
/// <returns>Callback registration token.</returns>
public Guid AddCallback(IWeakEventCallback callback)
{
lock (_lock)
{
if (_containers.Count == 0)
{
_containers.Insert(0, new WeakEventContainer());
}
if (_containers[0].Count > MaxCount)
{
_containers.Insert(0, new WeakEventContainer());
}
return _containers[0].Register(callback);
}
}
