/// <summary>
/// Called whenever one of the inner collection changed.
/// </summary>
/// <param name="managerType">Type of the manager we subscribed to.</param>
/// <param name="sender">The collection that sent the event.</param>
/// <param name="e">Information about the event.</param>
/// <returns>True if was able to perform the required operation.</returns>
/// <remarks><see cref="IWeakEventListener"/> implementation.</remarks>
public bool ReceiveWeakEvent(Type managerType, object sender, EventArgs e)
{
if (TargetObject != null && TargetProperty != null)
{
if (managerType == typeof(CollectionChangedEventManager))
{
// Update only if collection change event args matches the allowed actions for notification:
if (e is NotifyCollectionChangedEventArgs collectionargs && ActionsToNotify.HasFlag(collectionargs.Action))
{
// Update binding target when collection changed:
if (updateTargetAction != null)
{
if (Application.Current.Dispatcher.CheckAccess())
{
updateTargetAction.Invoke();
}
else
{
Application.Current.Dispatcher.BeginInvoke(updateTargetAction);
}
}
}
}
}
else if (sender is INotifyCollectionChanged collection)
{
CollectionChangedEventManager.RemoveListener(collection, this); // our binding expression is not used anymore, we can shut listening down.
}
return(true); // always return true otherwise ugly exception happen in the framework core.
}
/// <summary>
/// Called whenever one of the inner collection changed.
/// </summary>
/// <param name="managerType">Type of the manager we subscribed to.</param>
/// <param name="sender">The collection that sent the event.</param>
/// <param name="e">Information about the event.</param>
/// <returns>True if was able to perform the required operation.</returns>
/// <remarks><see cref="IWeakEventListener"/> implementation.</remarks>
public bool ReceiveWeakEvent(Type managerType, object sender, EventArgs e)
{
if (IsExtensionValid)
{
if (managerType == typeof(CollectionChangedEventManager))
{
// Update only if collection change event args matches the allowed actions for notification:
if (e is NotifyCollectionChangedEventArgs collectionargs && ActionsToNotify.HasFlag(collectionargs.Action))
{
// Update binding target when collection changed:
(GeneratedMultibindingExpression.Target as MultiBindingExpression).UpdateTarget();
return(true);
}
else
{
return(false);
}
}
}