public static void SubscribeCollectionItems <T>(this SubscribableCollection <T> collection, Action <T, PropertyChangedEventArgs> handler)
where T : INotifyPropertyChanged
{
void itemsHandler(object item, PropertyChangedEventArgs e)
{
handler((T)item, e);
}
void collectionHandler(object sender, NotifyCollectionChangedEventArgs e)
{
if (e.Action == NotifyCollectionChangedAction.Add || e.Action == NotifyCollectionChangedAction.Remove)
{
if (e.NewItems != null)
{
foreach (T item in e.NewItems)
{
item.PropertyChanged += itemsHandler;
}
}
if (e.OldItems != null)
{
foreach (T item in e.OldItems)
{
item.PropertyChanged -= itemsHandler;
}
}
}
}
collection.CollectionChanged += collectionHandler;
}
protected virtual bool RefillCollection <T>(ref SubscribableCollection <T> storage, IEnumerable <T> value, [CallerMemberName] string propertyName = "")
{
if (storage == value || value == null)
{
return(false);
}
else
{
OnPropertyChanging(propertyName);
if (storage == null)
{
if (value is SubscribableCollection <T> initCollection)
{
storage = initCollection;
}
else
{
storage = new SubscribableCollection <T>();
storage.AddRange(value);
}
}
else
{
storage.ReplaceWhole(value);
}
OnPropertyChanged(propertyName);
return(true);
}
}