HeadersFragment.java revision 9652881bb6af5a2b76f89d683bd420336f4bf463 
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 */
14
15package android.support.v17.leanback.app;
16
17import android.graphics.Color;
18import android.graphics.drawable.Drawable;
19import android.graphics.drawable.GradientDrawable;
20import android.os.Bundle;
21import android.support.v17.leanback.R;
22import android.support.v17.leanback.widget.FocusHighlightHelper;
23import android.support.v17.leanback.widget.ItemBridgeAdapter;
24import android.support.v17.leanback.widget.PresenterSelector;
25import android.support.v17.leanback.widget.OnItemSelectedListener;
26import android.support.v17.leanback.widget.Row;
27import android.support.v17.leanback.widget.RowHeaderPresenter;
28import android.support.v17.leanback.widget.SinglePresenterSelector;
29import android.support.v17.leanback.widget.VerticalGridView;
30import android.util.TypedValue;
31import android.view.View;
32import android.view.ViewGroup;
33import android.view.View.OnLayoutChangeListener;
34import android.widget.FrameLayout;
35
36/**
37 * An internal fragment containing a list of row headers.
38 */
39public class HeadersFragment extends BaseRowFragment {
40
41    interface OnHeaderClickedListener {
42        void onHeaderClicked();
43    }
44
45    private OnItemSelectedListener mOnItemSelectedListener;
46    private OnHeaderClickedListener mOnHeaderClickedListener;
47    private boolean mHeadersEnabled = true;
48    private boolean mHeadersGone = false;
49    private int mBackgroundColor;
50    private boolean mBackgroundColorSet;
51
52    private static final PresenterSelector sHeaderPresenter = new SinglePresenterSelector(
53            new RowHeaderPresenter(R.layout.lb_header));
54
55    public HeadersFragment() {
56        setPresenterSelector(sHeaderPresenter);
57    }
58
59    public void setOnHeaderClickedListener(OnHeaderClickedListener listener) {
60        mOnHeaderClickedListener = listener;
61    }
62
63    public void setOnItemSelectedListener(OnItemSelectedListener listener) {
64        mOnItemSelectedListener = listener;
65    }
66
67    @Override
68    protected VerticalGridView findGridViewFromRoot(View view) {
69        return (VerticalGridView) view.findViewById(R.id.browse_headers);
70    }
71
72    @Override
73    protected void onRowSelected(ViewGroup parent, View view, int position, long id) {
74        if (mOnItemSelectedListener != null) {
75            if (position >= 0) {
76                Row row = (Row) getAdapter().get(position);
77                mOnItemSelectedListener.onItemSelected(null, row);
78            } else {
79                mOnItemSelectedListener.onItemSelected(null, null);
80            }
81        }
82    }
83
84    private final ItemBridgeAdapter.AdapterListener mAdapterListener =
85            new ItemBridgeAdapter.AdapterListener() {
86        @Override
87        public void onCreate(ItemBridgeAdapter.ViewHolder viewHolder) {
88            View headerView = viewHolder.getViewHolder().view;
89            headerView.setOnClickListener(new View.OnClickListener() {
90                @Override
91                public void onClick(View v) {
92                    if (mOnHeaderClickedListener != null) {
93                        mOnHeaderClickedListener.onHeaderClicked();
94                    }
95                }
96            });
97            headerView.setFocusable(true);
98            headerView.setFocusableInTouchMode(true);
99            if (mWrapper != null) {
100                viewHolder.itemView.addOnLayoutChangeListener(sLayoutChangeListener);
101            } else {
102                headerView.addOnLayoutChangeListener(sLayoutChangeListener);
103            }
104        }
105
106    };
107
108    private static OnLayoutChangeListener sLayoutChangeListener = new OnLayoutChangeListener() {
109        @Override
110        public void onLayoutChange(View v, int left, int top, int right, int bottom,
111            int oldLeft, int oldTop, int oldRight, int oldBottom) {
112            v.setPivotX(0);
113            v.setPivotY(v.getMeasuredHeight() / 2);
114        }
115    };
116
117    @Override
118    protected int getLayoutResourceId() {
119        return R.layout.lb_headers_fragment;
120    }
121
122    @Override
123    public void onViewCreated(View view, Bundle savedInstanceState) {
124        super.onViewCreated(view, savedInstanceState);
125        final VerticalGridView listView = getVerticalGridView();
126        if (listView == null) {
127            return;
128        }
129        if (getBridgeAdapter() != null) {
130            FocusHighlightHelper.setupHeaderItemFocusHighlight(listView);
131        }
132        view.setBackgroundColor(getBackgroundColor());
133        if (mBackgroundColorSet) {
134            updateFadingEdgeToBrandColor();
135        }
136        updateListViewVisibility();
137    }
138
139    private void updateListViewVisibility() {
140        final VerticalGridView listView = getVerticalGridView();
141        if (listView != null) {
142            getView().setVisibility(mHeadersGone ? View.GONE : View.VISIBLE);
143            if (!mHeadersGone) {
144                if (mHeadersEnabled) {
145                    listView.setChildrenVisibility(View.VISIBLE);
146                } else {
147                    listView.setChildrenVisibility(View.INVISIBLE);
148                }
149            }
150        }
151    }
152
153    void setHeadersEnabled(boolean enabled) {
154        mHeadersEnabled = enabled;
155        updateListViewVisibility();
156    }
157
158    void setHeadersGone(boolean gone) {
159        mHeadersGone = gone;
160        updateListViewVisibility();
161    }
162
163    // Wrapper needed because of conflict between RecyclerView's use of alpha
164    // for ADD animations, and RowHeaderPresnter's use of alpha for selected level.
165    private final ItemBridgeAdapter.Wrapper mWrapper = new ItemBridgeAdapter.Wrapper() {
166        @Override
167        public void wrap(View wrapper, View wrapped) {
168            ((FrameLayout) wrapper).addView(wrapped);
169        }
170
171        @Override
172        public View createWrapper(View root) {
173            return new FrameLayout(root.getContext());
174        }
175    };
176    @Override
177    protected void updateAdapter() {
178        super.updateAdapter();
179        ItemBridgeAdapter adapter = getBridgeAdapter();
180        if (adapter != null) {
181            adapter.setAdapterListener(mAdapterListener);
182            adapter.setWrapper(mWrapper);
183        }
184        if (adapter != null && getVerticalGridView() != null) {
185            FocusHighlightHelper.setupHeaderItemFocusHighlight(getVerticalGridView());
186        }
187    }
188
189    void setBackgroundColor(int color) {
190        mBackgroundColor = color;
191        mBackgroundColorSet = true;
192
193        if (getView() != null) {
194            getView().setBackgroundColor(mBackgroundColor);
195            updateFadingEdgeToBrandColor();
196        }
197    }
198
199    private void updateFadingEdgeToBrandColor() {
200        View fadingView = getView().findViewById(R.id.fade_out_edge);
201        Drawable background = fadingView.getBackground();
202        if (background instanceof GradientDrawable) {
203            background.mutate();
204            ((GradientDrawable) background).setColors(
205                    new int[]{Color.TRANSPARENT,mBackgroundColor});
206        }
207    }
208
209    int getBackgroundColor() {
210        if (getActivity() == null) {
211            throw new IllegalStateException("Activity must be attached");
212        }
213
214        if (mBackgroundColorSet) {
215            return mBackgroundColor;
216        }
217
218        TypedValue outValue = new TypedValue();
219        getActivity().getTheme().resolveAttribute(R.attr.defaultBrandColor, outValue, true);
220        return getResources().getColor(outValue.resourceId);
221    }
222}
223