HeadersFragment.java revision 2f97594742886d045ca1ce409ebc6e6e780452f6 
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.os.Bundle;
18import android.support.v17.leanback.R;
19import android.support.v17.leanback.widget.FocusHighlightHelper;
20import android.support.v17.leanback.widget.ItemBridgeAdapter;
21import android.support.v17.leanback.widget.Presenter;
22import android.support.v17.leanback.widget.PresenterSelector;
23import android.support.v17.leanback.widget.OnItemSelectedListener;
24import android.support.v17.leanback.widget.Row;
25import android.support.v17.leanback.widget.RowHeaderPresenter;
26import android.support.v17.leanback.widget.SinglePresenterSelector;
27import android.support.v17.leanback.widget.VerticalGridView;
28import android.support.v7.widget.RecyclerView;
29import android.view.LayoutInflater;
30import android.view.View;
31import android.view.ViewGroup;
32import android.view.View.OnLayoutChangeListener;
33
34import java.util.ArrayList;
35import java.util.List;
36
37/**
38 * An internal fragment containing a list of row headers.
39 */
40public class HeadersFragment extends BaseRowFragment {
41
42    interface OnHeaderClickedListener {
43        void onHeaderClicked();
44    }
45
46    private OnItemSelectedListener mOnItemSelectedListener;
47    private OnHeaderClickedListener mOnHeaderClickedListener;
48    private boolean mShow = true;
49
50    private static final PresenterSelector sHeaderPresenter = new SinglePresenterSelector(
51            new RowHeaderPresenter());
52
53    public HeadersFragment() {
54        setPresenterSelector(sHeaderPresenter);
55    }
56
57    public void setOnHeaderClickedListener(OnHeaderClickedListener listener) {
58        mOnHeaderClickedListener = listener;
59    }
60
61    public void setOnItemSelectedListener(OnItemSelectedListener listener) {
62        mOnItemSelectedListener = listener;
63    }
64
65    @Override
66    protected void onRowSelected(ViewGroup parent, View view, int position, long id) {
67        if (mOnItemSelectedListener != null) {
68            if (position >= 0) {
69                Row row = (Row) getAdapter().get(position);
70                mOnItemSelectedListener.onItemSelected(null, row);
71            }
72        }
73    }
74
75    private final ItemBridgeAdapter.AdapterListener mAdapterListener =
76            new ItemBridgeAdapter.AdapterListener() {
77        @Override
78        public void onCreate(ItemBridgeAdapter.ViewHolder viewHolder) {
79            View headerView = viewHolder.getViewHolder().view;
80            headerView.setOnClickListener(new View.OnClickListener() {
81                @Override
82                public void onClick(View v) {
83                    if (mOnHeaderClickedListener != null) {
84                        mOnHeaderClickedListener.onHeaderClicked();
85                    }
86                }
87            });
88            headerView.setFocusable(true);
89            headerView.setFocusableInTouchMode(true);
90            headerView.addOnLayoutChangeListener(sLayoutChangeListener);
91        }
92
93        @Override
94        public void onAttachedToWindow(ItemBridgeAdapter.ViewHolder viewHolder) {
95            View headerView = viewHolder.getViewHolder().view;
96            if (mInTransition) {
97                updateHeaderViewForTransition(headerView, viewHolder.getPosition());
98            }
99        }
100    };
101
102    /**
103     * Preparing headerView for transition.
104     */
105    private void updateHeaderViewForTransition(View headerView, Integer position) {
106        final VerticalGridView listView = getVerticalGridView();
107        if (position == listView.getSelectedPosition()) {
108            headerView.setId(mReparentHeaderId);
109        } else {
110            headerView.setId(View.NO_ID);
111        }
112        headerView.setTag(R.id.lb_header_transition_position, position);
113    }
114
115    /**
116     * Preparing all headerViews for transition.
117     */
118    private void updateHeaderViewsForTransition() {
119        final VerticalGridView listView = getVerticalGridView();
120        if (listView == null) {
121            return;
122        }
123        final int count = listView.getChildCount();
124        for (int i = 0; i < count; i++) {
125            View child = listView.getChildAt(i);
126            updateHeaderViewForTransition(child,
127                    listView.getChildViewHolder(child).getPosition());
128        }
129    }
130
131    @Override
132    void onTransitionStart() {
133        super.onTransitionStart();
134        updateHeaderViewsForTransition();
135    }
136
137    private static OnLayoutChangeListener sLayoutChangeListener = new OnLayoutChangeListener() {
138        @Override
139        public void onLayoutChange(View v, int left, int top, int right, int bottom,
140            int oldLeft, int oldTop, int oldRight, int oldBottom) {
141            v.setPivotX(0);
142            v.setPivotY(v.getMeasuredHeight() / 2);
143        }
144    };
145
146    @Override
147    protected int getLayoutResourceId() {
148        return R.layout.lb_headers_fragment;
149    }
150
151    @Override
152    public void onViewCreated(View view, Bundle savedInstanceState) {
153        super.onViewCreated(view, savedInstanceState);
154        if (getBridgeAdapter() != null && getVerticalGridView() != null) {
155            FocusHighlightHelper.setupHeaderItemFocusHighlight(getVerticalGridView());
156        }
157    }
158
159    void setHeadersVisiblity(boolean show) {
160        mShow = show;
161        final VerticalGridView listView = getVerticalGridView();
162        if (listView != null) {
163            listView.setLayoutEnabled(show);
164        }
165    }
166
167    @Override
168    protected void updateAdapter() {
169        super.updateAdapter();
170        ItemBridgeAdapter adapter = getBridgeAdapter();
171        if (adapter != null) {
172            adapter.setAdapterListener(mAdapterListener);
173        }
174        if (adapter != null && getVerticalGridView() != null) {
175            FocusHighlightHelper.setupHeaderItemFocusHighlight(getVerticalGridView());
176        }
177    }
178}
179