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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 import com.android.tv.R;
     21 import com.android.tv.data.ProgramDataManager;
     22 import com.android.tv.recommendation.RecentChannelEvaluator;
     23 import com.android.tv.recommendation.Recommender;
     24 
     25 public class ChannelsRow extends ItemListRow {
     26     public static final String ID = ChannelsRow.class.getName();
     27 
     28     /** Minimum count for recent channels. */
     29     public static final int MIN_COUNT_FOR_RECENT_CHANNELS = 5;
     30     /** Maximum count for recent channels. */
     31     public static final int MAX_COUNT_FOR_RECENT_CHANNELS = 10;
     32 
     33     private Recommender mTvRecommendation;
     34     private ChannelsRowAdapter mChannelsAdapter;
     35     private ChannelsPosterPrefetcher mChannelsPosterPrefetcher;
     36 
     37     public ChannelsRow(Context context, Menu menu, ProgramDataManager programDataManager) {
     38         super(context, menu, R.string.menu_title_channels, R.dimen.card_layout_height, null);
     39         mTvRecommendation =
     40                 new Recommender(
     41                         getContext(),
     42                         new Recommender.Listener() {
     43                             @Override
     44                             public void onRecommenderReady() {
     45                                 mChannelsAdapter.update();
     46                                 mChannelsPosterPrefetcher.prefetch();
     47                             }
     48 
     49                             @Override
     50                             public void onRecommendationChanged() {
     51                                 mChannelsAdapter.update();
     52                                 mChannelsPosterPrefetcher.prefetch();
     53                             }
     54                         },
     55                         true);
     56         mTvRecommendation.registerEvaluator(new RecentChannelEvaluator());
     57         mChannelsAdapter =
     58                 new ChannelsRowAdapter(
     59                         context,
     60                         mTvRecommendation,
     61                         MIN_COUNT_FOR_RECENT_CHANNELS,
     62                         MAX_COUNT_FOR_RECENT_CHANNELS);
     63         setAdapter(mChannelsAdapter);
     64         mChannelsPosterPrefetcher =
     65                 new ChannelsPosterPrefetcher(context, programDataManager, mChannelsAdapter);
     66     }
     67 
     68     @Override
     69     public void release() {
     70         super.release();
     71         if (mTvRecommendation != null) {
     72             mTvRecommendation.release();
     73             mTvRecommendation = null;
     74         }
     75         mChannelsPosterPrefetcher.cancel();
     76     }
     77 
     78     /** Handle the update event of the recent channel. */
     79     @Override
     80     public void onRecentChannelsChanged() {
     81         mChannelsPosterPrefetcher.prefetch();
     82     }
     83 
     84     @Override
     85     public String getId() {
     86         return ID;
     87     }
     88 }
     89