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