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      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 
     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
     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
     73     public void onRecentChannelsChanged() {
     74         mChannelsPosterPrefetcher.prefetch();
     75     }
     76 
     77     @Override
     78     public String getId() {
     79         return ID;
     80     }
     81 }
     82