HeadersSupportFragment.java revision 42752c860a26deacca04ea9ebeb00ddb4d8ce2fc 
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.OnItemSelectedListener;
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.util.TypedValue;
34import android.view.View;
35import android.view.ViewGroup;
36import android.view.View.OnLayoutChangeListener;
37import android.widget.FrameLayout;
38
39/**
40 * An internal fragment containing a list of row headers.
41 */
42public class HeadersSupportFragment extends BaseRowSupportFragment {
43
44    interface OnHeaderClickedListener {
45        void onHeaderClicked();
46    }
47
48    private OnItemSelectedListener mOnItemSelectedListener;
49    private OnHeaderClickedListener mOnHeaderClickedListener;
50    private boolean mHeadersEnabled = true;
51    private boolean mHeadersGone = false;
52    private int mBackgroundColor;
53    private boolean mBackgroundColorSet;
54
55    private static final PresenterSelector sHeaderPresenter = new SinglePresenterSelector(
56            new RowHeaderPresenter(R.layout.lb_header));
57
58    public HeadersSupportFragment() {
59        setPresenterSelector(sHeaderPresenter);
60    }
61
62    public void setOnHeaderClickedListener(OnHeaderClickedListener listener) {
63        mOnHeaderClickedListener = listener;
64    }
65
66    public void setOnItemSelectedListener(OnItemSelectedListener listener) {
67        mOnItemSelectedListener = listener;
68    }
69
70    @Override
71    VerticalGridView findGridViewFromRoot(View view) {
72        return (VerticalGridView) view.findViewById(R.id.browse_headers);
73    }
74
75    @Override
76    void onRowSelected(ViewGroup parent, View view, int position, long id) {
77        if (mOnItemSelectedListener != null) {
78            if (position >= 0) {
79                Row row = (Row) getAdapter().get(position);
80                mOnItemSelectedListener.onItemSelected(null, row);
81            } else {
82                mOnItemSelectedListener.onItemSelected(null, null);
83            }
84        }
85    }
86
87    private final ItemBridgeAdapter.AdapterListener mAdapterListener =
88            new ItemBridgeAdapter.AdapterListener() {
89        @Override
90        public void onCreate(ItemBridgeAdapter.ViewHolder viewHolder) {
91            View headerView = viewHolder.getViewHolder().view;
92            headerView.setOnClickListener(new View.OnClickListener() {
93                @Override
94                public void onClick(View v) {
95                    if (mOnHeaderClickedListener != null) {
96                        mOnHeaderClickedListener.onHeaderClicked();
97                    }
98                }
99            });
100            headerView.setFocusable(true);
101            headerView.setFocusableInTouchMode(true);
102            if (mWrapper != null) {
103                viewHolder.itemView.addOnLayoutChangeListener(sLayoutChangeListener);
104            } else {
105                headerView.addOnLayoutChangeListener(sLayoutChangeListener);
106            }
107        }
108
109    };
110
111    private static OnLayoutChangeListener sLayoutChangeListener = new OnLayoutChangeListener() {
112        @Override
113        public void onLayoutChange(View v, int left, int top, int right, int bottom,
114            int oldLeft, int oldTop, int oldRight, int oldBottom) {
115            v.setPivotX(0);
116            v.setPivotY(v.getMeasuredHeight() / 2);
117        }
118    };
119
120    @Override
121    int getLayoutResourceId() {
122        return R.layout.lb_headers_fragment;
123    }
124
125    @Override
126    public void onViewCreated(View view, Bundle savedInstanceState) {
127        super.onViewCreated(view, savedInstanceState);
128        final VerticalGridView listView = getVerticalGridView();
129        if (listView == null) {
130            return;
131        }
132        if (getBridgeAdapter() != null) {
133            FocusHighlightHelper.setupHeaderItemFocusHighlight(listView);
134        }
135        view.setBackgroundColor(getBackgroundColor());
136        updateFadingEdgeToBrandColor(getBackgroundColor());
137        updateListViewVisibility();
138    }
139
140    private void updateListViewVisibility() {
141        final VerticalGridView listView = getVerticalGridView();
142        if (listView != null) {
143            getView().setVisibility(mHeadersGone ? View.GONE : View.VISIBLE);
144            if (!mHeadersGone) {
145                if (mHeadersEnabled) {
146                    listView.setChildrenVisibility(View.VISIBLE);
147                } else {
148                    listView.setChildrenVisibility(View.INVISIBLE);
149                }
150            }
151        }
152    }
153
154    void setHeadersEnabled(boolean enabled) {
155        mHeadersEnabled = enabled;
156        updateListViewVisibility();
157    }
158
159    void setHeadersGone(boolean gone) {
160        mHeadersGone = gone;
161        updateListViewVisibility();
162    }
163
164    static class NoOverlappingFrameLayout extends FrameLayout {
165
166        public NoOverlappingFrameLayout(Context context) {
167            super(context);
168        }
169
170        /**
171         * Avoid creating hardware layer for header dock.
172         */
173        @Override
174        public boolean hasOverlappingRendering() {
175            return false;
176        }
177    }
178
179    // Wrapper needed because of conflict between RecyclerView's use of alpha
180    // for ADD animations, and RowHeaderPresnter's use of alpha for selected level.
181    private final ItemBridgeAdapter.Wrapper mWrapper = new ItemBridgeAdapter.Wrapper() {
182        @Override
183        public void wrap(View wrapper, View wrapped) {
184            ((FrameLayout) wrapper).addView(wrapped);
185        }
186
187        @Override
188        public View createWrapper(View root) {
189            return new NoOverlappingFrameLayout(root.getContext());
190        }
191    };
192    @Override
193    void updateAdapter() {
194        super.updateAdapter();
195        ItemBridgeAdapter adapter = getBridgeAdapter();
196        if (adapter != null) {
197            adapter.setAdapterListener(mAdapterListener);
198            adapter.setWrapper(mWrapper);
199        }
200        if (adapter != null && getVerticalGridView() != null) {
201            FocusHighlightHelper.setupHeaderItemFocusHighlight(getVerticalGridView());
202        }
203    }
204
205    void setBackgroundColor(int color) {
206        mBackgroundColor = color;
207        mBackgroundColorSet = true;
208
209        if (getView() != null) {
210            getView().setBackgroundColor(mBackgroundColor);
211            updateFadingEdgeToBrandColor(mBackgroundColor);
212        }
213    }
214
215    private void updateFadingEdgeToBrandColor(int backgroundColor) {
216        View fadingView = getView().findViewById(R.id.fade_out_edge);
217        Drawable background = fadingView.getBackground();
218        if (background instanceof GradientDrawable) {
219            background.mutate();
220            ((GradientDrawable) background).setColors(
221                    new int[] {Color.TRANSPARENT, backgroundColor});
222        }
223    }
224
225    int getBackgroundColor() {
226        if (getActivity() == null) {
227            throw new IllegalStateException("Activity must be attached");
228        }
229
230        if (mBackgroundColorSet) {
231            return mBackgroundColor;
232        }
233
234        TypedValue outValue = new TypedValue();
235        getActivity().getTheme().resolveAttribute(R.attr.defaultBrandColor, outValue, true);
236        return getResources().getColor(outValue.resourceId);
237    }
238
239    @Override
240    void onTransitionStart() {
241        super.onTransitionStart();
242        if (!mHeadersEnabled) {
243            // When enabling headers fragment,  the RowHeaderView gets a focus but
244            // isShown() is still false because its parent is INVSIBILE, accessibility
245            // event is not sent.
246            // Workaround is: prevent focus to a child view during transition and put
247            // focus on it after transition is done.
248            final VerticalGridView listView = getVerticalGridView();
249            if (listView != null) {
250                listView.setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS);
251                if (listView.hasFocus()) {
252                    listView.requestFocus();
253                }
254            }
255        }
256    }
257
258    @Override
259    void onTransitionEnd() {
260        if (mHeadersEnabled) {
261            final VerticalGridView listView = getVerticalGridView();
262            if (listView != null) {
263                listView.setDescendantFocusability(ViewGroup.FOCUS_AFTER_DESCENDANTS);
264                if (listView.hasFocus()) {
265                    listView.requestFocus();
266                }
267            }
268        }
269        super.onTransitionEnd();
270    }
271}
272