private void TransitionerOnSelectionChanged(object sender, SelectionChangedEventArgs e)
{
ITransitionerViewModel previousViewModel = GetViewModels(e.RemovedItems).FirstOrDefault();
ITransitionerViewModel nextVieWModel = GetViewModels(e.AddedItems).FirstOrDefault();
previousViewModel?.Hidden(nextVieWModel);
nextVieWModel?.Shown(previousViewModel);
IEnumerable <ITransitionerViewModel> GetViewModels(IList list)
{
return(list.OfType <FrameworkElement>().Select(x => x.DataContext).OfType <ITransitionerViewModel>());
}
}
private void TransitionerOnSelectionChanged(object sender, SelectionChangedEventArgs e)
{
//NB: The event raised from Selector allows for lists of items, but the current version of the Transistioner only ever puts on item in each of these lists.
ITransitionerViewModel previousViewModel = GetViewModels(e.RemovedItems).FirstOrDefault();
ITransitionerViewModel nextVieWModel = GetViewModels(e.AddedItems).FirstOrDefault();
previousViewModel?.Hidden(nextVieWModel);
nextVieWModel?.Shown(previousViewModel);
IEnumerable <ITransitionerViewModel> GetViewModels(IList list)
{
return(list.OfType <FrameworkElement>().Select(x => x.DataContext).OfType <ITransitionerViewModel>());
}
}