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      1 /*
      2  * Copyright (C) 2016 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.dvr.ui.browse;
     18 
     19 import android.app.Activity;
     20 import android.content.Context;
     21 import android.support.annotation.CallSuper;
     22 import android.support.v17.leanback.widget.Presenter;
     23 import android.view.View;
     24 import android.view.View.OnClickListener;
     25 import android.view.ViewGroup;
     26 import com.android.tv.common.SoftPreconditions;
     27 import com.android.tv.dvr.ui.DvrUiHelper;
     28 import java.util.HashSet;
     29 import java.util.Set;
     30 
     31 /**
     32  * An abstract class to present DVR items in {@link RecordingCardView}, which is mainly used in
     33  * {@link DvrBrowseFragment}. DVR items might include: {@link
     34  * com.android.tv.dvr.data.ScheduledRecording}, {@link com.android.tv.dvr.data.RecordedProgram}, and
     35  * {@link com.android.tv.dvr.data.SeriesRecording}.
     36  */
     37 public abstract class DvrItemPresenter<T> extends Presenter {
     38     protected final Context mContext;
     39     private final Set<DvrItemViewHolder> mBoundViewHolders = new HashSet<>();
     40     private final OnClickListener mOnClickListener = onCreateOnClickListener();
     41 
     42     protected class DvrItemViewHolder extends ViewHolder {
     43         DvrItemViewHolder(RecordingCardView view) {
     44             super(view);
     45         }
     46 
     47         protected RecordingCardView getView() {
     48             return (RecordingCardView) view;
     49         }
     50 
     51         protected void onBound(T item) {}
     52 
     53         protected void onUnbound() {}
     54     }
     55 
     56     DvrItemPresenter(Context context) {
     57         mContext = context;
     58     }
     59 
     60     @Override
     61     public final ViewHolder onCreateViewHolder(ViewGroup parent) {
     62         return onCreateDvrItemViewHolder();
     63     }
     64 
     65     @Override
     66     public final void onBindViewHolder(ViewHolder baseHolder, Object item) {
     67         DvrItemViewHolder viewHolder;
     68         T dvrItem;
     69         try {
     70             viewHolder = (DvrItemViewHolder) baseHolder;
     71             Class<T> itemType = (Class<T>) item.getClass();
     72             dvrItem = itemType.cast(item);
     73         } catch (ClassCastException e) {
     74             SoftPreconditions.checkState(false);
     75             return;
     76         }
     77         viewHolder.view.setTag(item);
     78         viewHolder.view.setOnClickListener(mOnClickListener);
     79         onBindDvrItemViewHolder(viewHolder, dvrItem);
     80         viewHolder.onBound(dvrItem);
     81         mBoundViewHolders.add(viewHolder);
     82     }
     83 
     84     @Override
     85     @CallSuper
     86     public void onUnbindViewHolder(ViewHolder baseHolder) {
     87         DvrItemViewHolder viewHolder = (DvrItemViewHolder) baseHolder;
     88         mBoundViewHolders.remove(viewHolder);
     89         viewHolder.onUnbound();
     90         viewHolder.view.setTag(null);
     91         viewHolder.view.setOnClickListener(null);
     92     }
     93 
     94     /** Unbinds all bound view holders. */
     95     public void unbindAllViewHolders() {
     96         // When browse fragments are destroyed, RecyclerView would not call presenters'
     97         // onUnbindViewHolder(). We should handle it by ourselves to prevent resources leaks.
     98         for (ViewHolder viewHolder : new HashSet<>(mBoundViewHolders)) {
     99             onUnbindViewHolder(viewHolder);
    100         }
    101     }
    102 
    103     /** This method will be called when a {@link DvrItemViewHolder} is needed to be created. */
    104     protected abstract DvrItemViewHolder onCreateDvrItemViewHolder();
    105 
    106     /** This method will be called when a {@link DvrItemViewHolder} is bound to a DVR item. */
    107     protected abstract void onBindDvrItemViewHolder(DvrItemViewHolder viewHolder, T item);
    108 
    109     /** Returns context. */
    110     protected Context getContext() {
    111         return mContext;
    112     }
    113 
    114     /** Creates {@link OnClickListener} for DVR library's card views. */
    115     protected OnClickListener onCreateOnClickListener() {
    116         return new OnClickListener() {
    117             @Override
    118             public void onClick(View view) {
    119                 if (view instanceof RecordingCardView) {
    120                     RecordingCardView v = (RecordingCardView) view;
    121                     DvrUiHelper.startDetailsActivity(
    122                             (Activity) v.getContext(), v.getTag(), v.getImageView(), false);
    123                 }
    124             }
    125         };
    126     }
    127 }
    128