1 /*
2  * Copyright (C) 2024 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 
17 package com.android.systemui.media.controls.ui.util
18 
19 import androidx.recyclerview.widget.DiffUtil
20 import com.android.systemui.media.controls.ui.viewmodel.MediaCommonViewModel
21 
22 /** A [DiffUtil.Callback] to calculate difference between old and new media view-model list. */
23 class MediaViewModelCallback(
24     private val old: List<MediaCommonViewModel>,
25     private val new: List<MediaCommonViewModel>,
26 ) : DiffUtil.Callback() {
27 
getOldListSizenull28     override fun getOldListSize(): Int {
29         return old.size
30     }
31 
getNewListSizenull32     override fun getNewListSize(): Int {
33         return new.size
34     }
35 
areItemsTheSamenull36     override fun areItemsTheSame(oldIndex: Int, newIndex: Int): Boolean {
37         val oldItem = old[oldIndex]
38         val newItem = new[newIndex]
39         return if (
40             oldItem is MediaCommonViewModel.MediaControl &&
41                 newItem is MediaCommonViewModel.MediaControl
42         ) {
43             oldItem.instanceId == newItem.instanceId
44         } else {
45             oldItem is MediaCommonViewModel.MediaRecommendations &&
46                 newItem is MediaCommonViewModel.MediaRecommendations
47         }
48     }
49 
areContentsTheSamenull50     override fun areContentsTheSame(oldIndex: Int, newIndex: Int): Boolean {
51         val oldItem = old[oldIndex]
52         val newItem = new[newIndex]
53         return if (
54             oldItem is MediaCommonViewModel.MediaControl &&
55                 newItem is MediaCommonViewModel.MediaControl
56         ) {
57             oldItem.immediatelyUpdateUi == newItem.immediatelyUpdateUi
58         } else if (
59             oldItem is MediaCommonViewModel.MediaRecommendations &&
60                 newItem is MediaCommonViewModel.MediaRecommendations
61         ) {
62             oldItem.key == newItem.key && oldItem.loadingEnabled == newItem.loadingEnabled
63         } else {
64             false
65         }
66     }
67 }
68