RowsFragment.java revision 1c33346ba79177e64fe33da70ee73547d7bb15f7 
1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
5 * in compliance with the License. You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software distributed under the License
10 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
11 * or implied. See the License for the specific language governing permissions and limitations under
12 * the License.
13 */
14package android.support.v17.leanback.app;
15
16import android.animation.TimeAnimator;
17import android.animation.TimeAnimator.TimeListener;
18import android.graphics.Canvas;
19import android.os.Bundle;
20import android.support.v17.leanback.R;
21import android.support.v17.leanback.graphics.ColorOverlayDimmer;
22import android.support.v17.leanback.widget.ItemBridgeAdapter;
23import android.support.v17.leanback.widget.VerticalGridView;
24import android.support.v17.leanback.widget.OnItemSelectedListener;
25import android.support.v17.leanback.widget.OnItemClickedListener;
26import android.support.v17.leanback.widget.RowPresenter;
27import android.support.v17.leanback.widget.Presenter;
28import android.support.v17.leanback.widget.RowPresenter.ViewHolder;
29import android.support.v7.widget.RecyclerView;
30import android.util.Log;
31import android.view.View;
32import android.view.ViewGroup;
33import android.view.animation.DecelerateInterpolator;
34import android.view.animation.Interpolator;
35
36/**
37 * An ordered set of rows of leanback widgets.
38 */
39public class RowsFragment extends BaseRowFragment {
40
41    /**
42     * Internal helper class that manages row select animation and apply a default
43     * dim to each row.
44     */
45    final class RowViewHolderExtra implements TimeListener {
46        final RowPresenter mRowPresenter;
47        final RowPresenter.ViewHolder mRowViewHolder;
48
49        final TimeAnimator mSelectAnimator = new TimeAnimator();
50        final ColorOverlayDimmer mColorDimmer;
51        int mSelectAnimatorDurationInUse;
52        Interpolator mSelectAnimatorInterpolatorInUse;
53        float mSelectLevelAnimStart;
54        float mSelectLevelAnimDelta;
55
56        RowViewHolderExtra(ItemBridgeAdapter.ViewHolder ibvh) {
57            mRowPresenter = (RowPresenter) ibvh.getPresenter();
58            mRowViewHolder = (ViewHolder) ibvh.getViewHolder();
59            mSelectAnimator.setTimeListener(this);
60            if (mRowPresenter.getSelectEffectEnabled()
61                    && mRowPresenter.isUsingDefaultSelectEffect()) {
62                mColorDimmer = ColorOverlayDimmer.createDefault(ibvh.itemView.getContext());
63            } else {
64                mColorDimmer = null;
65            }
66        }
67
68        @Override
69        public void onTimeUpdate(TimeAnimator animation, long totalTime, long deltaTime) {
70            float fraction;
71            if (totalTime >= mSelectAnimatorDurationInUse) {
72                fraction = 1;
73                mSelectAnimator.end();
74            } else {
75                fraction = (float) (totalTime / (double) mSelectAnimatorDurationInUse);
76            }
77            if (mSelectAnimatorInterpolatorInUse != null) {
78                fraction = mSelectAnimatorInterpolatorInUse.getInterpolation(fraction);
79            }
80            float level =  mSelectLevelAnimStart + fraction * mSelectLevelAnimDelta;
81            if (mColorDimmer != null) {
82                mColorDimmer.setActiveLevel(level);
83            }
84            mRowPresenter.setSelectLevel(mRowViewHolder, level);
85        }
86
87        void animateSelect(boolean select, boolean immediate) {
88            endAnimation();
89            final float end = select ? 1 : 0;
90            if (immediate) {
91                mRowPresenter.setSelectLevel(mRowViewHolder, end);
92                if (mColorDimmer != null) {
93                    mColorDimmer.setActiveLevel(end);
94                }
95            } else if (mRowPresenter.getSelectLevel(mRowViewHolder) != end) {
96                mSelectAnimatorDurationInUse = mSelectAnimatorDuration;
97                mSelectAnimatorInterpolatorInUse = mSelectAnimatorInterpolator;
98                mSelectLevelAnimStart = mRowPresenter.getSelectLevel(mRowViewHolder);
99                mSelectLevelAnimDelta = end - mSelectLevelAnimStart;
100                mSelectAnimator.start();
101            }
102        }
103
104        void endAnimation() {
105            mSelectAnimator.end();
106        }
107
108        void drawDimForSelection(Canvas c) {
109            if (mColorDimmer != null) {
110                mColorDimmer.drawColorOverlay(c, mRowViewHolder.view, false);
111            }
112        }
113    }
114
115    private static final String TAG = "RowsFragment";
116    private static final boolean DEBUG = false;
117
118    private BackgroundParams mBackgroundParams;
119    private ItemBridgeAdapter.ViewHolder mSelectedViewHolder;
120    private boolean mExpand = true;
121    private boolean mViewsCreated;
122
123    private OnItemSelectedListener mOnItemSelectedListener;
124    private OnItemClickedListener mOnItemClickedListener;
125
126    // Select animation and interpolator are not intended to exposed at this moment.
127    // They might be synced with vertical scroll animation later.
128    int mSelectAnimatorDuration;
129    Interpolator mSelectAnimatorInterpolator = new DecelerateInterpolator(2);
130
131    /**
132     * Set background parameters.
133     * @deprecated Use BackgroundManager instead
134     */
135    @Deprecated
136    public void setBackgroundParams(BackgroundParams params) {
137        mBackgroundParams = params;
138    }
139
140    /**
141     * Returns the background parameters.
142     * @deprecated Use BackgroundManager instead
143     */
144    @Deprecated
145    public BackgroundParams getBackgroundParams() {
146        return mBackgroundParams;
147    }
148
149    /**
150     * Sets an item clicked listener.
151     */
152    public void setOnItemClickedListener(OnItemClickedListener listener) {
153        mOnItemClickedListener = listener;
154        if (mViewsCreated) {
155            throw new IllegalStateException(
156                    "Item clicked listener must be set before views are created");
157        }
158    }
159
160    /**
161     * Returns the item clicked listener.
162     */
163    public OnItemClickedListener getOnItemClickedListener() {
164        return mOnItemClickedListener;
165    }
166
167    /**
168     * Set the visibility of titles/hovercard of browse rows.
169     */
170    public void setExpand(boolean expand) {
171        final int count = getVerticalGridView().getChildCount();
172        if (DEBUG) Log.v(TAG, "setExpand " + expand + " count " + count);
173        mExpand = expand;
174        for (int i = 0; i < count; i++) {
175            View view = getVerticalGridView().getChildAt(i);
176            ItemBridgeAdapter.ViewHolder vh = (ItemBridgeAdapter.ViewHolder) getVerticalGridView().getChildViewHolder(view);
177            setRowViewExpanded(vh, mExpand);
178        }
179    }
180
181    /**
182     * Sets an item selection listener.
183     */
184    public void setOnItemSelectedListener(OnItemSelectedListener listener) {
185        mOnItemSelectedListener = listener;
186        VerticalGridView listView = getVerticalGridView();
187        if (listView != null) {
188            final int count = listView.getChildCount();
189            for (int i = 0; i < count; i++) {
190                View view = listView.getChildAt(i);
191                ItemBridgeAdapter.ViewHolder vh = (ItemBridgeAdapter.ViewHolder)
192                        listView.getChildViewHolder(view);
193                setOnItemSelectedListener(vh, mOnItemSelectedListener);
194            }
195        }
196    }
197
198    @Override
199    protected void onRowSelected(ViewGroup parent, View view, int position, long id) {
200        ItemBridgeAdapter.ViewHolder vh = (view == null) ? null :
201            (ItemBridgeAdapter.ViewHolder) getVerticalGridView().getChildViewHolder(view);
202
203        if (mSelectedViewHolder != vh) {
204            if (DEBUG) Log.v(TAG, "new row selected position " + position + " view " + view);
205
206            if (mSelectedViewHolder != null) {
207                setRowViewSelected(mSelectedViewHolder, false, false);
208            }
209            mSelectedViewHolder = vh;
210            if (mSelectedViewHolder != null) {
211                setRowViewSelected(mSelectedViewHolder, true, false);
212            }
213        }
214    }
215
216    @Override
217    protected int getLayoutResourceId() {
218        return R.layout.lb_rows_fragment;
219    }
220
221    @Override
222    public void onCreate(Bundle savedInstanceState) {
223        super.onCreate(savedInstanceState);
224        mSelectAnimatorDuration = getResources().getInteger(R.integer.lb_browse_rows_anim_duration);
225    }
226
227    @Override
228    public void onViewCreated(View view, Bundle savedInstanceState) {
229        if (DEBUG) Log.v(TAG, "onViewCreated");
230        super.onViewCreated(view, savedInstanceState);
231        getVerticalGridView().setItemAlignmentViewId(R.id.row_list);
232        getVerticalGridView().addItemDecoration(mItemDecoration);
233    }
234
235    private RecyclerView.ItemDecoration mItemDecoration = new RecyclerView.ItemDecoration() {
236        @Override
237        public void onDrawOver(Canvas c, RecyclerView parent) {
238            final int count = parent.getChildCount();
239            for (int i = 0; i < count; i++) {
240                ItemBridgeAdapter.ViewHolder ibvh = (ItemBridgeAdapter.ViewHolder)
241                        parent.getViewHolderForChildAt(i);
242                RowViewHolderExtra extra = (RowViewHolderExtra) ibvh.getExtraObject();
243                extra.drawDimForSelection(c);
244            }
245        }
246    };
247
248    private static void setRowViewExpanded(ItemBridgeAdapter.ViewHolder vh, boolean expanded) {
249        ((RowPresenter) vh.getPresenter()).setRowViewExpanded(
250                (RowPresenter.ViewHolder) vh.getViewHolder(), expanded);
251    }
252
253    private static void setRowViewSelected(ItemBridgeAdapter.ViewHolder vh, boolean selected, boolean immediate) {
254        RowViewHolderExtra extra = (RowViewHolderExtra) vh.getExtraObject();
255        extra.animateSelect(selected, immediate);
256        ((RowPresenter) vh.getPresenter()).setRowViewSelected(
257                (RowPresenter.ViewHolder) vh.getViewHolder(), selected);
258    }
259
260    private static void setOnItemSelectedListener(ItemBridgeAdapter.ViewHolder vh,
261            OnItemSelectedListener listener) {
262        ((RowPresenter) vh.getPresenter()).setOnItemSelectedListener(listener);
263    }
264
265    private final ItemBridgeAdapter.AdapterListener mBridgeAdapterListener = new ItemBridgeAdapter.AdapterListener() {
266        @Override
267        public void onAddPresenter(Presenter presenter) {
268            ((RowPresenter) presenter).setOnItemClickedListener(mOnItemClickedListener);
269        }
270        @Override
271        public void onCreate(ItemBridgeAdapter.ViewHolder vh) {
272            mViewsCreated = true;
273            vh.setExtraObject(new RowViewHolderExtra(vh));
274        }
275        @Override
276        public void onAttachedToWindow(ItemBridgeAdapter.ViewHolder vh) {
277            if (DEBUG) Log.v(TAG, "onAttachToWindow");
278            setRowViewExpanded(vh, mExpand);
279            setOnItemSelectedListener(vh, mOnItemSelectedListener);
280        }
281        @Override
282        public void onBind(ItemBridgeAdapter.ViewHolder vh) {
283            setRowViewSelected(vh, false, true);
284        }
285        @Override
286        public void onUnbind(ItemBridgeAdapter.ViewHolder vh) {
287            RowViewHolderExtra extra = (RowViewHolderExtra) vh.getExtraObject();
288            extra.endAnimation();
289        }
290    };
291
292    @Override
293    protected void updateAdapter() {
294        super.updateAdapter();
295        mSelectedViewHolder = null;
296        mViewsCreated = false;
297
298        ItemBridgeAdapter adapter = getBridgeAdapter();
299        if (adapter != null) {
300            adapter.setAdapterListener(mBridgeAdapterListener);
301        }
302    }
303}
304