void AddOrUpdateScrollListener()
{
RemoveScrollListener();
_recyclerViewScrollListener = CreateScrollListener();
AddOnScrollListener(_recyclerViewScrollListener);
}
void RemoveScrollListener()
{
if (_recyclerViewScrollListener == null)
return;
_recyclerViewScrollListener.Dispose();
ClearOnScrollListeners();
_recyclerViewScrollListener = null;
}
protected virtual void TearDownOldElement(ItemsView oldElement)
{
if (oldElement == null)
{
return;
}
// Stop listening for layout property changes
if (_layout != null)
{
_layout.PropertyChanged -= LayoutPropertyChanged;
}
// Stop listening for property changes
oldElement.PropertyChanged -= OnElementPropertyChanged;
// Stop listening for ScrollTo requests
oldElement.ScrollToRequested -= ScrollToRequested;
if (_recyclerViewScrollListener != null)
{
_recyclerViewScrollListener.Dispose();
ClearOnScrollListeners();
_recyclerViewScrollListener = null;
}
if (ItemsViewAdapter != null)
{
// Stop watching for empty items or scroll adjustments
_emptyCollectionObserver.Stop(ItemsViewAdapter);
_itemsUpdateScrollObserver.Stop(ItemsViewAdapter);
// Unhook whichever adapter is active
SetAdapter(null);
_emptyViewAdapter?.Dispose();
ItemsViewAdapter?.Dispose();
}
if (_snapManager != null)
{
_snapManager.Dispose();
_snapManager = null;
}
if (_itemDecoration != null)
{
RemoveItemDecoration(_itemDecoration);
}
}
public RecyclerViewVerseViewAdapter(Context context, RecyclerView recyclerView, LinearLayoutManager layoutManager, int chapterHeadingVerseOffset)
{
_recyclerView = recyclerView;
_layoutManager = layoutManager;
_chapterHeadingVerseOffset = chapterHeadingVerseOffset;
_scrollListener = new RecyclerViewScrollListener();
_scrollListener.Scrolled += ScrollListenerOnScrolled;
_recyclerView.AddOnScrollListener(_scrollListener);
_swipeTouchListener = new SwipeTouchListener(context);
_swipeTouchListener.OnDown += SwipeTouchListenerOnOnDown;
_swipeTouchListener.OnSwipeLeft += SwipeTouchListenerOnOnSwipeLeft;
_swipeTouchListener.OnSwipeRight += SwipeTouchListenerOnOnSwipeRight;
_recyclerView.SetOnTouchListener(_swipeTouchListener);
}
protected virtual void SetUpNewElement(TItemsView newElement)
{
if (newElement == null)
{
ItemsView = null;
return;
}
ItemsView = newElement;
ItemsView.PropertyChanged += OnElementPropertyChanged;
// TODO hartez 2018/06/06 20:49:14 Review whether we can just do this in the constructor
if (Tracker == null)
{
Tracker = new VisualElementTracker(this);
}
this.EnsureId();
UpdateItemsSource();
_layout = GetItemsLayout();
SetLayoutManager(SelectLayoutManager(_layout));
UpdateSnapBehavior();
UpdateBackgroundColor();
UpdateFlowDirection();
UpdateItemSpacing();
UpdateHorizontalScrollBarVisibility();
UpdateVerticalScrollBarVisibility();
// Keep track of the ItemsLayout's property changes
if (_layout != null)
{
_layout.PropertyChanged += LayoutPropertyChanged;
}
// Listen for ScrollTo requests
ItemsView.ScrollToRequested += ScrollToRequested;
_recyclerViewScrollListener = new RecyclerViewScrollListener <TItemsView, TItemsViewSource>(ItemsView, ItemsViewAdapter);
AddOnScrollListener(_recyclerViewScrollListener);
}
