1/*
2 * Copyright 2018 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package androidx.recyclerview.widget;
18
19import androidx.annotation.NonNull;
20
21/**
22 * ListUpdateCallback that dispatches update events to the given adapter.
23 *
24 * @see DiffUtil.DiffResult#dispatchUpdatesTo(RecyclerView.Adapter)
25 */
26public final class AdapterListUpdateCallback implements ListUpdateCallback {
27    @NonNull
28    private final RecyclerView.Adapter mAdapter;
29
30    /**
31     * Creates an AdapterListUpdateCallback that will dispatch update events to the given adapter.
32     *
33     * @param adapter The Adapter to send updates to.
34     */
35    public AdapterListUpdateCallback(@NonNull RecyclerView.Adapter adapter) {
36        mAdapter = adapter;
37    }
38
39    /** {@inheritDoc} */
40    @Override
41    public void onInserted(int position, int count) {
42        mAdapter.notifyItemRangeInserted(position, count);
43    }
44
45    /** {@inheritDoc} */
46    @Override
47    public void onRemoved(int position, int count) {
48        mAdapter.notifyItemRangeRemoved(position, count);
49    }
50
51    /** {@inheritDoc} */
52    @Override
53    public void onMoved(int fromPosition, int toPosition) {
54        mAdapter.notifyItemMoved(fromPosition, toPosition);
55    }
56
57    /** {@inheritDoc} */
58    @Override
59    public void onChanged(int position, int count, Object payload) {
60        mAdapter.notifyItemRangeChanged(position, count, payload);
61    }
62}
63