/*
* Method for synchronization if the collection of the ViewModels changed with the
* cases add, remove and reset.
*/
private void ViewModelCollectionChanged(object bookCollectionVM, NotifyCollectionChangedEventArgs e)
{
if (synchDisabled)
{
return;
}
// Disable synchronization
synchDisabled = true;
switch (e.Action)
{
//add a new book to the model collection
case NotifyCollectionChangedAction.Add:
foreach (var newBook in e.NewItems.OfType <BookViewModel>().Select(v => v.wrappedBook).OfType <Book>())
{
bookCollection.Add(newBook);
}
break;
//remove a book from the model collection
case NotifyCollectionChangedAction.Remove:
foreach (var oldBook in e.OldItems.OfType <BookViewModel>().Select(v => v.wrappedBook).OfType <Book>())
{
bookCollection.Remove(oldBook);
}
break;
/*
* reset the model collection by clearing the collection and adding the models of the
* saved viewmodels.
*/
case NotifyCollectionChangedAction.Reset:
bookCollection.Clear();
foreach (var book in e.NewItems.OfType <BookViewModel>().Select(v => v.wrappedBook).OfType <Book>())
{
bookCollection.Add(book);
}
break;
}
//Enable synchronization
synchDisabled = false;
}
