HeadersSupportFragment.java revision 7f43e18536eae40705d5c63830e9edb283f196ad 
1/* This file is auto-generated from HeadersFragment.java.  DO NOT MODIFY. */
2
3/*
4 * Copyright (C) 2014 The Android Open Source Project
5 *
6 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
7 * in compliance with the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software distributed under the License
12 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
13 * or implied. See the License for the specific language governing permissions and limitations under
14 * the License.
15 */
16
17package android.support.v17.leanback.app;
18
19import android.content.Context;
20import android.graphics.Color;
21import android.graphics.drawable.Drawable;
22import android.graphics.drawable.GradientDrawable;
23import android.os.Bundle;
24import android.support.v17.leanback.R;
25import android.support.v17.leanback.widget.FocusHighlightHelper;
26import android.support.v17.leanback.widget.ItemBridgeAdapter;
27import android.support.v17.leanback.widget.PresenterSelector;
28import android.support.v17.leanback.widget.OnItemViewSelectedListener;
29import android.support.v17.leanback.widget.Row;
30import android.support.v17.leanback.widget.RowHeaderPresenter;
31import android.support.v17.leanback.widget.SinglePresenterSelector;
32import android.support.v17.leanback.widget.VerticalGridView;
33import android.support.v7.widget.RecyclerView;
34import android.util.TypedValue;
35import android.view.View;
36import android.view.ViewGroup;
37import android.view.View.OnLayoutChangeListener;
38import android.widget.FrameLayout;
39
40/**
41 * An internal fragment containing a list of row headers.
42 */
43public class HeadersSupportFragment extends BaseRowSupportFragment {
44
45    interface OnHeaderClickedListener {
46        void onHeaderClicked();
47    }
48
49    interface OnHeaderViewSelectedListener {
50        void onHeaderSelected(RowHeaderPresenter.ViewHolder viewHolder, Row row);
51    }
52
53    private OnHeaderViewSelectedListener mOnHeaderViewSelectedListener;
54    private OnHeaderClickedListener mOnHeaderClickedListener;
55    private boolean mHeadersEnabled = true;
56    private boolean mHeadersGone = false;
57    private int mBackgroundColor;
58    private boolean mBackgroundColorSet;
59
60    private static final PresenterSelector sHeaderPresenter = new SinglePresenterSelector(
61            new RowHeaderPresenter(R.layout.lb_header));
62
63    public HeadersSupportFragment() {
64        setPresenterSelector(sHeaderPresenter);
65    }
66
67    public void setOnHeaderClickedListener(OnHeaderClickedListener listener) {
68        mOnHeaderClickedListener = listener;
69    }
70
71    public void setOnHeaderViewSelectedListener(OnHeaderViewSelectedListener listener) {
72        mOnHeaderViewSelectedListener = listener;
73    }
74
75    @Override
76    VerticalGridView findGridViewFromRoot(View view) {
77        return (VerticalGridView) view.findViewById(R.id.browse_headers);
78    }
79
80    @Override
81    void onRowSelected(RecyclerView parent, RecyclerView.ViewHolder viewHolder,
82            int position, int subposition) {
83        if (mOnHeaderViewSelectedListener != null) {
84            if (viewHolder != null && position >= 0) {
85                Row row = (Row) getAdapter().get(position);
86                ItemBridgeAdapter.ViewHolder vh = (ItemBridgeAdapter.ViewHolder) viewHolder;
87                mOnHeaderViewSelectedListener.onHeaderSelected(
88                        (RowHeaderPresenter.ViewHolder) vh.getViewHolder(), row);
89            } else {
90                mOnHeaderViewSelectedListener.onHeaderSelected(null, null);
91            }
92        }
93    }
94
95    private final ItemBridgeAdapter.AdapterListener mAdapterListener =
96            new ItemBridgeAdapter.AdapterListener() {
97        @Override
98        public void onCreate(ItemBridgeAdapter.ViewHolder viewHolder) {
99            View headerView = viewHolder.getViewHolder().view;
100            headerView.setOnClickListener(new View.OnClickListener() {
101                @Override
102                public void onClick(View v) {
103                    if (mOnHeaderClickedListener != null) {
104                        mOnHeaderClickedListener.onHeaderClicked();
105                    }
106                }
107            });
108            headerView.setFocusable(true);
109            headerView.setFocusableInTouchMode(true);
110            if (mWrapper != null) {
111                viewHolder.itemView.addOnLayoutChangeListener(sLayoutChangeListener);
112            } else {
113                headerView.addOnLayoutChangeListener(sLayoutChangeListener);
114            }
115        }
116
117    };
118
119    private static OnLayoutChangeListener sLayoutChangeListener = new OnLayoutChangeListener() {
120        @Override
121        public void onLayoutChange(View v, int left, int top, int right, int bottom,
122            int oldLeft, int oldTop, int oldRight, int oldBottom) {
123            v.setPivotX(v.getLayoutDirection() == View.LAYOUT_DIRECTION_RTL ? v.getWidth() : 0);
124            v.setPivotY(v.getMeasuredHeight() / 2);
125        }
126    };
127
128    @Override
129    int getLayoutResourceId() {
130        return R.layout.lb_headers_fragment;
131    }
132
133    @Override
134    public void onViewCreated(View view, Bundle savedInstanceState) {
135        super.onViewCreated(view, savedInstanceState);
136        final VerticalGridView listView = getVerticalGridView();
137        if (listView == null) {
138            return;
139        }
140        if (getBridgeAdapter() != null) {
141            FocusHighlightHelper.setupHeaderItemFocusHighlight(listView);
142        }
143        if (mBackgroundColorSet) {
144            view.setBackgroundColor(mBackgroundColor);
145            updateFadingEdgeToBrandColor(mBackgroundColor);
146        }
147        updateListViewVisibility();
148    }
149
150    private void updateListViewVisibility() {
151        final VerticalGridView listView = getVerticalGridView();
152        if (listView != null) {
153            getView().setVisibility(mHeadersGone ? View.GONE : View.VISIBLE);
154            if (!mHeadersGone) {
155                if (mHeadersEnabled) {
156                    listView.setChildrenVisibility(View.VISIBLE);
157                } else {
158                    listView.setChildrenVisibility(View.INVISIBLE);
159                }
160            }
161        }
162    }
163
164    void setHeadersEnabled(boolean enabled) {
165        mHeadersEnabled = enabled;
166        updateListViewVisibility();
167    }
168
169    void setHeadersGone(boolean gone) {
170        mHeadersGone = gone;
171        updateListViewVisibility();
172    }
173
174    static class NoOverlappingFrameLayout extends FrameLayout {
175
176        public NoOverlappingFrameLayout(Context context) {
177            super(context);
178        }
179
180        /**
181         * Avoid creating hardware layer for header dock.
182         */
183        @Override
184        public boolean hasOverlappingRendering() {
185            return false;
186        }
187    }
188
189    // Wrapper needed because of conflict between RecyclerView's use of alpha
190    // for ADD animations, and RowHeaderPresnter's use of alpha for selected level.
191    private final ItemBridgeAdapter.Wrapper mWrapper = new ItemBridgeAdapter.Wrapper() {
192        @Override
193        public void wrap(View wrapper, View wrapped) {
194            ((FrameLayout) wrapper).addView(wrapped);
195        }
196
197        @Override
198        public View createWrapper(View root) {
199            return new NoOverlappingFrameLayout(root.getContext());
200        }
201    };
202    @Override
203    void updateAdapter() {
204        super.updateAdapter();
205        ItemBridgeAdapter adapter = getBridgeAdapter();
206        if (adapter != null) {
207            adapter.setAdapterListener(mAdapterListener);
208            adapter.setWrapper(mWrapper);
209        }
210        if (adapter != null && getVerticalGridView() != null) {
211            FocusHighlightHelper.setupHeaderItemFocusHighlight(getVerticalGridView());
212        }
213    }
214
215    void setBackgroundColor(int color) {
216        mBackgroundColor = color;
217        mBackgroundColorSet = true;
218
219        if (getView() != null) {
220            getView().setBackgroundColor(mBackgroundColor);
221            updateFadingEdgeToBrandColor(mBackgroundColor);
222        }
223    }
224
225    private void updateFadingEdgeToBrandColor(int backgroundColor) {
226        View fadingView = getView().findViewById(R.id.fade_out_edge);
227        Drawable background = fadingView.getBackground();
228        if (background instanceof GradientDrawable) {
229            background.mutate();
230            ((GradientDrawable) background).setColors(
231                    new int[] {Color.TRANSPARENT, backgroundColor});
232        }
233    }
234
235    @Override
236    void onTransitionStart() {
237        super.onTransitionStart();
238        if (!mHeadersEnabled) {
239            // When enabling headers fragment,  the RowHeaderView gets a focus but
240            // isShown() is still false because its parent is INVSIBILE, accessibility
241            // event is not sent.
242            // Workaround is: prevent focus to a child view during transition and put
243            // focus on it after transition is done.
244            final VerticalGridView listView = getVerticalGridView();
245            if (listView != null) {
246                listView.setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS);
247                if (listView.hasFocus()) {
248                    listView.requestFocus();
249                }
250            }
251        }
252    }
253
254    @Override
255    void onTransitionEnd() {
256        if (mHeadersEnabled) {
257            final VerticalGridView listView = getVerticalGridView();
258            if (listView != null) {
259                listView.setDescendantFocusability(ViewGroup.FOCUS_AFTER_DESCENDANTS);
260                if (listView.hasFocus()) {
261                    listView.requestFocus();
262                }
263            }
264        }
265        super.onTransitionEnd();
266    }
267}
268