HeadersFragment.java revision 4cf79b1c4d38a190317961891f9fd052836710fd 
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.os.Bundle;
19import android.support.v17.leanback.R;
20import android.support.v17.leanback.widget.FocusHighlightHelper;
21import android.support.v17.leanback.widget.ItemBridgeAdapter;
22import android.support.v17.leanback.widget.Presenter;
23import android.support.v17.leanback.widget.PresenterSelector;
24import android.support.v17.leanback.widget.OnItemSelectedListener;
25import android.support.v17.leanback.widget.Row;
26import android.support.v17.leanback.widget.RowHeaderPresenter;
27import android.support.v17.leanback.widget.SinglePresenterSelector;
28import android.support.v17.leanback.widget.VerticalGridView;
29import android.support.v7.widget.RecyclerView;
30import android.util.TypedValue;
31import android.view.LayoutInflater;
32import android.view.View;
33import android.view.ViewGroup;
34import android.view.View.OnLayoutChangeListener;
35
36import java.util.ArrayList;
37import java.util.List;
38
39/**
40 * An internal fragment containing a list of row headers.
41 */
42public class HeadersFragment extends BaseRowFragment {
43
44    interface OnHeaderClickedListener {
45        void onHeaderClicked();
46    }
47
48    private OnItemSelectedListener mOnItemSelectedListener;
49    private OnHeaderClickedListener mOnHeaderClickedListener;
50    private boolean mShow = true;
51    private int mBackgroundColor;
52    private boolean mBackgroundColorSet;
53
54    private static final PresenterSelector sHeaderPresenter = new SinglePresenterSelector(
55            new RowHeaderPresenter());
56
57    public HeadersFragment() {
58        setPresenterSelector(sHeaderPresenter);
59    }
60
61    public void setOnHeaderClickedListener(OnHeaderClickedListener listener) {
62        mOnHeaderClickedListener = listener;
63    }
64
65    public void setOnItemSelectedListener(OnItemSelectedListener listener) {
66        mOnItemSelectedListener = listener;
67    }
68
69    @Override
70    protected void onRowSelected(ViewGroup parent, View view, int position, long id) {
71        if (mOnItemSelectedListener != null) {
72            if (position >= 0) {
73                Row row = (Row) getAdapter().get(position);
74                mOnItemSelectedListener.onItemSelected(null, row);
75            }
76        }
77    }
78
79    private final ItemBridgeAdapter.AdapterListener mAdapterListener =
80            new ItemBridgeAdapter.AdapterListener() {
81        @Override
82        public void onCreate(ItemBridgeAdapter.ViewHolder viewHolder) {
83            View headerView = viewHolder.getViewHolder().view;
84            headerView.setOnClickListener(new View.OnClickListener() {
85                @Override
86                public void onClick(View v) {
87                    if (mOnHeaderClickedListener != null) {
88                        mOnHeaderClickedListener.onHeaderClicked();
89                    }
90                }
91            });
92            headerView.setFocusable(true);
93            headerView.setFocusableInTouchMode(true);
94            headerView.addOnLayoutChangeListener(sLayoutChangeListener);
95        }
96
97        @Override
98        public void onAttachedToWindow(ItemBridgeAdapter.ViewHolder viewHolder) {
99            View headerView = viewHolder.getViewHolder().view;
100            if (mInTransition) {
101                updateHeaderViewForTransition(headerView, viewHolder.getPosition());
102            }
103        }
104    };
105
106    /**
107     * Preparing headerView for transition.
108     */
109    private void updateHeaderViewForTransition(View headerView, Integer position) {
110        final VerticalGridView listView = getVerticalGridView();
111        if (position == listView.getSelectedPosition()) {
112            headerView.setId(mReparentHeaderId);
113        } else {
114            headerView.setId(View.NO_ID);
115        }
116        headerView.setTag(R.id.lb_header_transition_position, position);
117    }
118
119    /**
120     * Preparing all headerViews for transition.
121     */
122    private void updateHeaderViewsForTransition() {
123        final VerticalGridView listView = getVerticalGridView();
124        if (listView == null) {
125            return;
126        }
127        final int count = listView.getChildCount();
128        for (int i = 0; i < count; i++) {
129            View child = listView.getChildAt(i);
130            updateHeaderViewForTransition(child,
131                    listView.getChildViewHolder(child).getPosition());
132        }
133    }
134
135    @Override
136    void onTransitionStart() {
137        super.onTransitionStart();
138        updateHeaderViewsForTransition();
139    }
140
141    private static OnLayoutChangeListener sLayoutChangeListener = new OnLayoutChangeListener() {
142        @Override
143        public void onLayoutChange(View v, int left, int top, int right, int bottom,
144            int oldLeft, int oldTop, int oldRight, int oldBottom) {
145            v.setPivotX(0);
146            v.setPivotY(v.getMeasuredHeight() / 2);
147        }
148    };
149
150    @Override
151    protected int getLayoutResourceId() {
152        return R.layout.lb_headers_fragment;
153    }
154
155    @Override
156    public void onViewCreated(View view, Bundle savedInstanceState) {
157        super.onViewCreated(view, savedInstanceState);
158        final VerticalGridView listView = getVerticalGridView();
159        if (listView == null) {
160            return;
161        }
162        if (getBridgeAdapter() != null) {
163            FocusHighlightHelper.setupHeaderItemFocusHighlight(listView);
164        }
165        listView.setBackgroundColor(getBackgroundColor());
166    }
167
168    void setHeadersVisiblity(boolean show) {
169        mShow = show;
170        final VerticalGridView listView = getVerticalGridView();
171        if (listView != null) {
172            listView.setLayoutEnabled(show);
173        }
174    }
175
176    @Override
177    protected void updateAdapter() {
178        super.updateAdapter();
179        ItemBridgeAdapter adapter = getBridgeAdapter();
180        if (adapter != null) {
181            adapter.setAdapterListener(mAdapterListener);
182        }
183        if (adapter != null && getVerticalGridView() != null) {
184            FocusHighlightHelper.setupHeaderItemFocusHighlight(getVerticalGridView());
185        }
186    }
187
188    void setBackgroundColor(int color) {
189        mBackgroundColor = color;
190        mBackgroundColorSet = true;
191
192        if (getVerticalGridView() != null) {
193            getVerticalGridView().setBackgroundColor(mBackgroundColor);
194        }
195    }
196
197    int getBackgroundColor() {
198        if (getActivity() == null) {
199            throw new IllegalStateException("Activity must be attached");
200        }
201
202        if (mBackgroundColorSet) {
203            return mBackgroundColor;
204        }
205
206        TypedValue outValue = new TypedValue();
207        getActivity().getTheme().resolveAttribute(android.R.attr.colorBackground, outValue, true);
208        return getResources().getColor(outValue.resourceId);
209    }
210}
211