/// <summary>
/// Makes the filter aware of the <see cref="IRoutedMessageHandler"/>.
/// </summary>
/// <param name="messageHandler">The message handler.</param>
public void MakeAwareOf(IRoutedMessageHandler messageHandler)
{
var notifier = messageHandler.Unwrap() as INotifyPropertyChanged;
if (notifier == null) return;
var helper = messageHandler.GetMetadata<ItemDependencyObserver>();
if (helper != null) return;
helper = new ItemDependencyObserver(messageHandler, _methodFactory, notifier);
messageHandler.AddMetadata(helper);
}
/// <summary>
/// Makes the filter aware of the <see cref="IRoutedMessageHandler"/>.
/// </summary>
/// <param name="messageHandler">The message handler.</param>
public void MakeAwareOf(IRoutedMessageHandler messageHandler)
{
var notifier = messageHandler.Unwrap() as INotifyPropertyChanged;
if (notifier == null)
{
return;
}
var helper = messageHandler.GetMetadata <ItemDependencyObserver>();
if (helper != null)
{
return;
}
helper = new ItemDependencyObserver(messageHandler, _methodFactory, notifier);
messageHandler.AddMetadata(helper);
}