public BookmarksTableSource(BookmarksViewDataSource dataSource)
{
_bookmarks = dataSource;
if (_bookmarks is INotifyCollectionChanged incc)
{
var listener = new Internal.WeakEventListener <INotifyCollectionChanged, object, NotifyCollectionChangedEventArgs>(incc);
listener.OnEventAction = (instance, source, eventArgs) => CollectionChanged?.Invoke(this, eventArgs);
listener.OnDetachAction = (instance, weakEventListener) => instance.CollectionChanged -= weakEventListener.OnEvent;
incc.CollectionChanged += listener.OnEvent;
}
}
internal BookmarksAdapter(Context?context, BookmarksViewDataSource dataSource)
{
_context = context;
_dataSource = dataSource;
_shadowList = dataSource.ToList();
var listener = new Internal.WeakEventListener <INotifyCollectionChanged, object, NotifyCollectionChangedEventArgs>(dataSource)
{
OnEventAction = (instance, source, eventArgs) =>
{
switch (eventArgs.Action)
{
case NotifyCollectionChangedAction.Add:
_shadowList.InsertRange(eventArgs.NewStartingIndex, eventArgs.NewItems.OfType <Bookmark>());
NotifyItemInserted(eventArgs.NewStartingIndex);
break;
case NotifyCollectionChangedAction.Remove:
_shadowList.RemoveRange(eventArgs.OldStartingIndex, eventArgs.OldItems.Count);
NotifyItemRemoved(eventArgs.OldStartingIndex);
break;
case NotifyCollectionChangedAction.Reset:
_shadowList = _dataSource.ToList();
NotifyDataSetChanged();
break;
case NotifyCollectionChangedAction.Move:
_shadowList = _dataSource.ToList();
NotifyDataSetChanged();
break;
case NotifyCollectionChangedAction.Replace:
_shadowList[eventArgs.OldStartingIndex] = (Bookmark)eventArgs.NewItems[0];
NotifyItemChanged(eventArgs.OldStartingIndex);
break;
}
},
OnDetachAction = (instance, weakEventListener) => instance.CollectionChanged -= weakEventListener.OnEvent,
};
dataSource.CollectionChanged += listener.OnEvent;
}