Examples with ListUpdateCallback android.support.v7.util.ListUpdateCallback used on opensource projects

Example 1 with ListUpdateCallback

use of android.support.v7.util.ListUpdateCallback in project FastAdapter by mikepenz.

the class FastAdapterDiffUtil method set.

public static <A extends ItemAdapter<Item>, Item extends IItem> A set(final A adapter, final List<Item> items, final DiffCallback<Item> callback, final boolean detectMoves) {
    if (adapter.isUseIdDistributor()) {
        IdDistributor.checkIds(items);
    }
    //first collapse all items
    adapter.getFastAdapter().collapse(false);
    //if we have a comparator then sort
    if (adapter.getComparator() != null) {
        Collections.sort(items, adapter.getComparator());
    }
    //map the types
    adapter.mapPossibleTypes(items);
    //remember the old items
    final List<Item> oldItems = adapter.getAdapterItems();
    DiffUtil.DiffResult result = DiffUtil.calculateDiff(new DiffUtil.Callback() {

        @Override
        public int getOldListSize() {
            return oldItems.size();
        }

        @Override
        public int getNewListSize() {
            return items.size();
        }

        @Override
        public boolean areItemsTheSame(int oldItemPosition, int newItemPosition) {
            return callback.areItemsTheSame(oldItems.get(oldItemPosition), items.get(newItemPosition));
        }

        @Override
        public boolean areContentsTheSame(int oldItemPosition, int newItemPosition) {
            return callback.areContentsTheSame(oldItems.get(oldItemPosition), items.get(newItemPosition));
        }

        @Nullable
        @Override
        public Object getChangePayload(int oldItemPosition, int newItemPosition) {
            Object result = callback.getChangePayload(oldItems.get(oldItemPosition), oldItemPosition, items.get(newItemPosition), newItemPosition);
            return result == null ? super.getChangePayload(oldItemPosition, newItemPosition) : result;
        }
    }, detectMoves);
    //make sure the new items list is not a reference of the already mItems list
    if (items != oldItems) {
        //remove all previous items
        if (!oldItems.isEmpty()) {
            oldItems.clear();
        }
        //add all new items to the list
        oldItems.addAll(items);
    }
    result.dispatchUpdatesTo(new ListUpdateCallback() {

        @Override
        public void onInserted(int position, int count) {
            adapter.getFastAdapter().notifyAdapterItemRangeInserted(adapter.getFastAdapter().getPreItemCountByOrder(adapter.getOrder()) + position, count);
        }

        @Override
        public void onRemoved(int position, int count) {
            adapter.getFastAdapter().notifyAdapterItemRangeRemoved(adapter.getFastAdapter().getPreItemCountByOrder(adapter.getOrder()) + position, count);
        }

        @Override
        public void onMoved(int fromPosition, int toPosition) {
            adapter.getFastAdapter().notifyAdapterItemMoved(adapter.getFastAdapter().getPreItemCountByOrder(adapter.getOrder()) + fromPosition, toPosition);
        }

        @Override
        public void onChanged(int position, int count, Object payload) {
            adapter.getFastAdapter().notifyAdapterItemRangeChanged(adapter.getFastAdapter().getPreItemCountByOrder(adapter.getOrder()) + position, count, payload);
        }
    });
    return adapter;
}