protected virtual void UpdateEmptyView()
{
if (ItemsViewAdapter == null || ItemsView == null)
{
return;
}
var emptyView = ItemsView?.EmptyView;
var emptyViewTemplate = ItemsView?.EmptyViewTemplate;
if (emptyView != null || emptyViewTemplate != null)
{
if (_emptyViewAdapter == null)
{
_emptyViewAdapter = new EmptyViewAdapter(ItemsView);
}
_emptyViewAdapter.EmptyView = emptyView;
_emptyViewAdapter.EmptyViewTemplate = emptyViewTemplate;
_emptyCollectionObserver.Start(ItemsViewAdapter);
}
else
{
_emptyCollectionObserver.Stop(ItemsViewAdapter);
}
UpdateEmptyViewVisibility();
}
protected virtual void UpdateItemsUpdatingScrollMode()
{
if (ItemsViewAdapter == null || ItemsView == null)
{
return;
}
if (ItemsView.ItemsUpdatingScrollMode == ItemsUpdatingScrollMode.KeepItemsInView)
{
// Keeping the current items in view is the default, so we don't need to watch for data changes
_itemsUpdateScrollObserver.Stop(ItemsViewAdapter);
}
else
{
_itemsUpdateScrollObserver.Start(ItemsViewAdapter);
}
}
protected virtual void UpdateEmptyView()
{
if (ItemsViewAdapter == null || ItemsView == null)
{
return;
}
var emptyView = ItemsView?.EmptyView;
var emptyViewTemplate = ItemsView?.EmptyViewTemplate;
if (emptyView != null || emptyViewTemplate != null)
{
if (_emptyViewAdapter == null)
{
_emptyViewAdapter = new EmptyViewAdapter(ItemsView);
}
if (ItemsView is StructuredItemsView structuredItemsView)
{
_emptyViewAdapter.Header = structuredItemsView.Header;
_emptyViewAdapter.HeaderTemplate = structuredItemsView.HeaderTemplate;
_emptyViewAdapter.Footer = structuredItemsView.Footer;
_emptyViewAdapter.FooterTemplate = structuredItemsView.FooterTemplate;
}
_emptyViewAdapter.EmptyView = emptyView;
_emptyViewAdapter.EmptyViewTemplate = emptyViewTemplate;
_emptyCollectionObserver.Start(ItemsViewAdapter);
_emptyViewAdapter.NotifyDataSetChanged();
}
else
{
_emptyCollectionObserver.Stop(ItemsViewAdapter);
}
UpdateEmptyViewVisibility();
}
