protected override void OnElementChanged(ElementChangedEventArgs <ListView> e)
{
base.OnElementChanged(e);
if (e.OldElement != null)
{
e.OldElement.ItemSelected -= OnElementItemSelected;
e.OldElement.ScrollToRequested -= OnElementScrollToRequested;
((ITemplatedItemsView <Cell>)e.OldElement).TemplatedItems.CollectionChanged -= OnCollectionChanged;
if (Control != null)
{
Control.Loaded -= ControlOnLoaded;
}
}
if (e.NewElement != null)
{
e.NewElement.ItemSelected += OnElementItemSelected;
e.NewElement.ScrollToRequested += OnElementScrollToRequested;
((ITemplatedItemsView <Cell>)e.NewElement).TemplatedItems.CollectionChanged += OnCollectionChanged;
if (List == null)
{
List = new ListViewTransparent
{
IsSynchronizedWithCurrentItem = false,
ItemTemplate = (global::Windows.UI.Xaml.DataTemplate)WApp.Current.Resources["CellTemplate"],
HeaderTemplate = (global::Windows.UI.Xaml.DataTemplate)WApp.Current.Resources["View"],
FooterTemplate = (global::Windows.UI.Xaml.DataTemplate)WApp.Current.Resources["View"],
ItemContainerStyle = (global::Windows.UI.Xaml.Style)WApp.Current.Resources["FormsListViewItem"],
GroupStyleSelector = (GroupStyleSelector)WApp.Current.Resources["ListViewGroupSelector"]
};
List.SelectionChanged += OnControlSelectionChanged;
}
ReloadData();
UpdateGrouping();
UpdateHeader();
UpdateFooter();
UpdateSelectionMode();
UpdateWindowsSpecificSelectionMode();
ClearSizeEstimate();
UpdateVerticalScrollBarVisibility();
UpdateHorizontalScrollBarVisibility();
if (Control != null)
{
Control.Loaded += ControlOnLoaded;
}
}
}
protected override void Dispose(bool disposing)
{
if (_disposed)
{
return;
}
_disposed = true;
if (disposing)
{
if (List != null)
{
foreach (ViewToRendererConverter.WrapperControl wrapperControl in FindDescendants <ViewToRendererConverter.WrapperControl>(List))
{
wrapperControl.CleanUp();
}
if (_subscribedToTapped)
{
_subscribedToTapped = false;
List.Tapped -= ListOnTapped;
}
if (_subscribedToItemClick)
{
_subscribedToItemClick = false;
List.ItemClick -= OnListItemClicked;
}
List.SelectionChanged -= OnControlSelectionChanged;
if (_collectionViewSource != null)
{
_collectionViewSource.Source = null;
}
List.DataContext = null;
// Leaving this here as a warning because setting this to null causes
// an AccessViolationException if you run Issue1975
// List.ItemsSource = null;
List = null;
}
if (_zoom != null)
{
_zoom.ViewChangeCompleted -= OnViewChangeCompleted;
_zoom = null;
}
}
base.Dispose(disposing);
}