HeadersFragment.java revision d736653bfee7fc83fc68d57d0e0bee5fa807287f 
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(R.layout.lb_header));
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            } else {
76                mOnItemSelectedListener.onItemSelected(null, null);
77            }
78        }
79    }
80
81    private final ItemBridgeAdapter.AdapterListener mAdapterListener =
82            new ItemBridgeAdapter.AdapterListener() {
83        @Override
84        public void onCreate(ItemBridgeAdapter.ViewHolder viewHolder) {
85            View headerView = viewHolder.getViewHolder().view;
86            headerView.setOnClickListener(new View.OnClickListener() {
87                @Override
88                public void onClick(View v) {
89                    if (mOnHeaderClickedListener != null) {
90                        mOnHeaderClickedListener.onHeaderClicked();
91                    }
92                }
93            });
94            headerView.setFocusable(true);
95            headerView.setFocusableInTouchMode(true);
96            headerView.addOnLayoutChangeListener(sLayoutChangeListener);
97        }
98
99    };
100
101    private static OnLayoutChangeListener sLayoutChangeListener = new OnLayoutChangeListener() {
102        @Override
103        public void onLayoutChange(View v, int left, int top, int right, int bottom,
104            int oldLeft, int oldTop, int oldRight, int oldBottom) {
105            v.setPivotX(0);
106            v.setPivotY(v.getMeasuredHeight() / 2);
107        }
108    };
109
110    @Override
111    protected int getLayoutResourceId() {
112        return R.layout.lb_headers_fragment;
113    }
114
115    @Override
116    public void onViewCreated(View view, Bundle savedInstanceState) {
117        super.onViewCreated(view, savedInstanceState);
118        final VerticalGridView listView = getVerticalGridView();
119        if (listView == null) {
120            return;
121        }
122        if (getBridgeAdapter() != null) {
123            FocusHighlightHelper.setupHeaderItemFocusHighlight(listView);
124        }
125        listView.setBackgroundColor(getBackgroundColor());
126    }
127
128    void setHeadersVisiblity(boolean show) {
129        mShow = show;
130        final VerticalGridView listView = getVerticalGridView();
131        if (listView != null) {
132            listView.setLayoutEnabled(show);
133        }
134    }
135
136    @Override
137    protected void updateAdapter() {
138        super.updateAdapter();
139        ItemBridgeAdapter adapter = getBridgeAdapter();
140        if (adapter != null) {
141            adapter.setAdapterListener(mAdapterListener);
142        }
143        if (adapter != null && getVerticalGridView() != null) {
144            FocusHighlightHelper.setupHeaderItemFocusHighlight(getVerticalGridView());
145        }
146    }
147
148    void setBackgroundColor(int color) {
149        mBackgroundColor = color;
150        mBackgroundColorSet = true;
151
152        if (getVerticalGridView() != null) {
153            getVerticalGridView().setBackgroundColor(mBackgroundColor);
154        }
155    }
156
157    int getBackgroundColor() {
158        if (getActivity() == null) {
159            throw new IllegalStateException("Activity must be attached");
160        }
161
162        if (mBackgroundColorSet) {
163            return mBackgroundColor;
164        }
165
166        TypedValue outValue = new TypedValue();
167        getActivity().getTheme().resolveAttribute(android.R.attr.colorBackground, outValue, true);
168        return getResources().getColor(outValue.resourceId);
169    }
170}
171