internal override void Reload(RecyclerViewObservableAdapterBase adapter)
{
var groupedAdapter = (RecyclerViewObservableGroupedAdapterBase)adapter;
ItemsMap.Clear();
ItemsMap.Add(ItemMap.CreateForHeader());
var sectionsCount = groupedAdapter.GetSectionsCount();
for (var section = 0; section < sectionsCount; section++)
{
ItemsMap.Add(ItemMap.CreateForSectionHeader(groupedAdapter.GetItemsGroup(section)?.Key));
var sectionItemsCount = groupedAdapter.GetSectionItemsCount(section);
for (var row = 0; row < sectionItemsCount; row++)
{
ItemsMap.Add(ItemMap.CreateForItem(groupedAdapter.GetItem(section, row)));
}
ItemsMap.Add(ItemMap.CreateForSectionFooter(groupedAdapter.GetItemsGroup(section)?.Key));
}
ItemsMap.Add(ItemMap.CreateForFooter());
groupedAdapter.NotifyDataSetChanged();
}
internal void ReplaceItems(int section, [NotNull] NotifyCollectionChangedEventArgs args, [NotNull] RecyclerView.Adapter adapter)
{
var oldStartingIndex = GetItemPlainOffset(section, args.OldStartingIndex);
var count = 0;
foreach (var item in args.NewItems.NotNull())
{
ItemsMap[oldStartingIndex + count++] = ItemMap.CreateForItem(item);
}
adapter.NotifyItemRangeChanged(oldStartingIndex, count);
}
internal void AddItems(int section, [NotNull] NotifyCollectionChangedEventArgs args, [NotNull] RecyclerView.Adapter adapter)
{
var newStartingIndex = GetItemPlainOffset(section, args.NewStartingIndex);
var count = 0;
foreach (var item in args.NewItems.NotNull())
{
ItemsMap.Insert(newStartingIndex + count++, ItemMap.CreateForItem(item));
}
adapter.NotifyItemRangeInserted(newStartingIndex, count);
}
internal void AddGroups([NotNull] NotifyCollectionChangedEventArgs args, [NotNull] RecyclerView.Adapter adapter)
{
var newStartingIndex = GetSectionPlainOffset(args.NewStartingIndex);
var count = 0;
foreach (IGrouping <object, object> itemsGroup in args.NewItems.NotNull())
{
ItemsMap.Insert(newStartingIndex + count++, ItemMap.CreateForSectionHeader(itemsGroup?.Key));
if (itemsGroup != null)
{
foreach (var item in itemsGroup)
{
ItemsMap.Insert(newStartingIndex + count++, ItemMap.CreateForItem(item));
}
}
ItemsMap.Insert(newStartingIndex + count++, ItemMap.CreateForSectionFooter(itemsGroup?.Key));
}
adapter.NotifyItemRangeInserted(newStartingIndex, count);
}
