1 /*
2  * Copyright (C) 2015 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.tv.menu;
18 
19 import android.content.Context;
20 
21 import com.android.tv.R;
22 import com.android.tv.data.ProgramDataManager;
23 import com.android.tv.recommendation.RecentChannelEvaluator;
24 import com.android.tv.recommendation.Recommender;
25 
26 public class ChannelsRow extends ItemListRow {
27     public static final String ID = ChannelsRow.class.getName();
28 
29     private static final int MIN_COUNT_FOR_RECENT_CHANNELS = 5;
30     private static final int MAX_COUNT_FOR_RECENT_CHANNELS = 10;
31 
32     private Recommender mTvRecommendation;
33     private ChannelsRowAdapter mChannelsAdapter;
34     private ChannelsPosterPrefetcher mChannelsPosterPrefetcher;
35 
ChannelsRow(Context context, Menu menu, ProgramDataManager programDataManager)36     public ChannelsRow(Context context, Menu menu, ProgramDataManager programDataManager) {
37         super(context, menu, R.string.menu_title_channels, R.dimen.card_layout_height, null);
38         mTvRecommendation = new Recommender(getContext(), new Recommender.Listener() {
39             @Override
40             public void onRecommenderReady() {
41                 mChannelsAdapter.update();
42                 mChannelsPosterPrefetcher.prefetch();
43             }
44 
45             @Override
46             public void onRecommendationChanged() {
47                 mChannelsAdapter.update();
48                 mChannelsPosterPrefetcher.prefetch();
49             }
50         }, true);
51         mTvRecommendation.registerEvaluator(new RecentChannelEvaluator());
52         mChannelsAdapter = new ChannelsRowAdapter(context, mTvRecommendation,
53                 MIN_COUNT_FOR_RECENT_CHANNELS, MAX_COUNT_FOR_RECENT_CHANNELS);
54         setAdapter(mChannelsAdapter);
55         mChannelsPosterPrefetcher = new ChannelsPosterPrefetcher(context, programDataManager,
56                 mChannelsAdapter);
57     }
58 
59     @Override
release()60     public void release() {
61         super.release();
62         if (mTvRecommendation != null) {
63             mTvRecommendation.release();
64             mTvRecommendation = null;
65         }
66         mChannelsPosterPrefetcher.cancel();
67     }
68 
69     /**
70      * Handle the update event of the recent channel.
71      */
72     @Override
onRecentChannelsChanged()73     public void onRecentChannelsChanged() {
74         mChannelsPosterPrefetcher.prefetch();
75     }
76 
77     @Override
getId()78     public String getId() {
79         return ID;
80     }
81 }
82