1/*
2 * Copyright (C) 2017 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 */
16package com.android.car.media.drawer;
17
18import android.content.Context;
19import android.graphics.PorterDuff;
20import android.graphics.drawable.Drawable;
21import android.media.MediaDescription;
22import android.media.browse.MediaBrowser;
23import android.media.session.MediaSession;
24import android.support.annotation.Nullable;
25import android.util.Log;
26import com.android.car.app.DrawerItemViewHolder;
27import com.android.car.media.MediaPlaybackModel;
28import com.android.car.media.R;
29
30import java.util.ArrayList;
31import java.util.List;
32
33/**
34 * {@link MediaItemsFetcher} implementation that fetches items from a specific {@link MediaBrowser}
35 * node.
36 * <p>
37 * It optionally supports surfacing the Media app's queue as the last item.
38 */
39class MediaBrowserItemsFetcher implements MediaItemsFetcher {
40    private static final String TAG = "Media.BrowserFetcher";
41
42    /**
43     * An id that can be returned from {@link MediaBrowser.MediaItem#getMediaId()} to indicate that
44     * a {@link android.media.browse.MediaBrowser.MediaItem} representing the play queue has been
45     * clicked.
46     */
47    static final String PLAY_QUEUE_MEDIA_ID = "com.android.car.media.drawer.PLAY_QUEUE";
48
49    private final Context mContext;
50    private final MediaPlaybackModel mMediaPlaybackModel;
51    private final String mMediaId;
52    private final boolean mShowQueueItem;
53    private final MediaItemOnClickListener mItemClickListener;
54    private ItemsUpdatedCallback mCallback;
55    private List<MediaBrowser.MediaItem> mItems = new ArrayList<>();
56    private boolean mQueueAvailable;
57
58    MediaBrowserItemsFetcher(Context context, MediaPlaybackModel model,
59            MediaItemOnClickListener listener, String mediaId, boolean showQueueItem) {
60        mContext = context;
61        mMediaPlaybackModel = model;
62        mItemClickListener = listener;
63        mMediaId = mediaId;
64        mShowQueueItem = showQueueItem;
65    }
66
67    @Override
68    public void start(ItemsUpdatedCallback callback) {
69        mCallback = callback;
70        updateQueueAvailability();
71        mMediaPlaybackModel.getMediaBrowser().subscribe(mMediaId, mSubscriptionCallback);
72        mMediaPlaybackModel.addListener(mModelListener);
73    }
74
75    private final MediaPlaybackModel.Listener mModelListener =
76            new MediaPlaybackModel.AbstractListener() {
77        @Override
78        public void onQueueChanged(List<MediaSession.QueueItem> queue) {
79            updateQueueAvailability();
80        }
81        @Override
82        public void onSessionDestroyed(CharSequence destroyedMediaClientName) {
83            updateQueueAvailability();
84        }
85    };
86
87    private final MediaBrowser.SubscriptionCallback mSubscriptionCallback =
88        new MediaBrowser.SubscriptionCallback() {
89            @Override
90            public void onChildrenLoaded(String parentId, List<MediaBrowser.MediaItem> children) {
91                mItems.clear();
92                mItems.addAll(children);
93                mCallback.onItemsUpdated();
94            }
95
96            @Override
97            public void onError(String parentId) {
98                Log.e(TAG, "Error loading children of: " + mMediaId);
99                mItems.clear();
100                mCallback.onItemsUpdated();
101            }
102        };
103
104    private void updateQueueAvailability() {
105        if (mShowQueueItem && !mMediaPlaybackModel.getQueue().isEmpty()) {
106            mQueueAvailable = true;
107        }
108    }
109
110    @Override
111    public int getItemCount() {
112        int size = mItems.size();
113        if (mQueueAvailable) {
114            size++;
115        }
116        return size;
117    }
118
119    @Override
120    public boolean usesSmallLayout(int position) {
121        if (mQueueAvailable && position == mItems.size()) {
122            return true;
123        }
124        return MediaItemsFetcher.usesSmallLayout(mItems.get(position).getDescription());
125    }
126
127    @Override
128    public void populateViewHolder(DrawerItemViewHolder holder, int position) {
129        if (mQueueAvailable && position == mItems.size()) {
130            holder.getTitle().setText(mMediaPlaybackModel.getQueueTitle());
131            return;
132        }
133        MediaBrowser.MediaItem item = mItems.get(position);
134        MediaItemsFetcher.populateViewHolderFrom(holder, item.getDescription());
135
136        if (holder.getRightIcon() == null) {
137            return;
138        }
139
140        if (item.isBrowsable()) {
141            int iconColor = mContext.getColor(R.color.car_tint);
142            Drawable drawable = mContext.getDrawable(R.drawable.ic_chevron_right);
143            drawable.setColorFilter(iconColor, PorterDuff.Mode.SRC_IN);
144            holder.getRightIcon().setImageDrawable(drawable);
145        } else {
146            holder.getRightIcon().setImageDrawable(null);
147        }
148    }
149
150    @Override
151    public void onItemClick(int position) {
152        if (mItemClickListener == null) {
153            return;
154        }
155
156        MediaBrowser.MediaItem item = mQueueAvailable && position == mItems.size()
157                ? createPlayQueueMediaItem()
158                : mItems.get(position);
159
160        mItemClickListener.onMediaItemClicked(item);
161    }
162
163    /**
164     * Creates and returns a {@link android.media.browse.MediaBrowser.MediaItem} that represents an
165     * entry for the play queue. A play queue media item will have a media id of
166     * {@link #PLAY_QUEUE_MEDIA_ID} and is {@link MediaBrowser.MediaItem#FLAG_BROWSABLE}.
167     */
168    private MediaBrowser.MediaItem createPlayQueueMediaItem() {
169        MediaDescription description = new MediaDescription.Builder()
170                .setMediaId(PLAY_QUEUE_MEDIA_ID)
171                .setTitle(mMediaPlaybackModel.getQueueTitle())
172                .build();
173
174        return new MediaBrowser.MediaItem(description, MediaBrowser.MediaItem.FLAG_BROWSABLE);
175    }
176
177    @Override
178    public void cleanup() {
179        mMediaPlaybackModel.removeListener(mModelListener);
180        mMediaPlaybackModel.getMediaBrowser().unsubscribe(mMediaId);
181        mCallback = null;
182    }
183
184    @Override
185    public int getScrollPosition() {
186        return MediaItemsFetcher.DONT_SCROLL;
187    }
188}
189