protected void AddWeakEventListener(INotifyPropertyChanged source, PropertyChangedEventHandler handler)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
if (handler == null)
{
throw new ArgumentNullException("handler");
}
// Add listener to internal list
PropertyChangedEventListener listener = new PropertyChangedEventListener(source, handler);
property_changed_listeners.Add(listener);
// Add listener to event manager
PropertyChangedEventManager.AddListener(source, listener, "");
}
protected void RemoveWeakEventListener(INotifyPropertyChanged source, PropertyChangedEventHandler handler)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
if (handler == null)
{
throw new ArgumentNullException("handler");
}
// Find listener in internal list
PropertyChangedEventListener listener = property_changed_listeners.LastOrDefault(l => l.Source == source && l.Handler == handler);
if (listener != null)
{
// Remove listener from internal list and event manager
property_changed_listeners.Remove(listener);
PropertyChangedEventManager.RemoveListener(source, listener, "");
}
}