HeadersFragment.java revision 268de3d2ea3de1be0725a80bbc79dd7b8b18617e 
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            }
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    };
98
99    private static OnLayoutChangeListener sLayoutChangeListener = new OnLayoutChangeListener() {
100        @Override
101        public void onLayoutChange(View v, int left, int top, int right, int bottom,
102            int oldLeft, int oldTop, int oldRight, int oldBottom) {
103            v.setPivotX(0);
104            v.setPivotY(v.getMeasuredHeight() / 2);
105        }
106    };
107
108    @Override
109    protected int getLayoutResourceId() {
110        return R.layout.lb_headers_fragment;
111    }
112
113    @Override
114    public void onViewCreated(View view, Bundle savedInstanceState) {
115        super.onViewCreated(view, savedInstanceState);
116        final VerticalGridView listView = getVerticalGridView();
117        if (listView == null) {
118            return;
119        }
120        if (getBridgeAdapter() != null) {
121            FocusHighlightHelper.setupHeaderItemFocusHighlight(listView);
122        }
123        listView.setBackgroundColor(getBackgroundColor());
124    }
125
126    void setHeadersVisiblity(boolean show) {
127        mShow = show;
128        final VerticalGridView listView = getVerticalGridView();
129        if (listView != null) {
130            listView.setLayoutEnabled(show);
131        }
132    }
133
134    @Override
135    protected void updateAdapter() {
136        super.updateAdapter();
137        ItemBridgeAdapter adapter = getBridgeAdapter();
138        if (adapter != null) {
139            adapter.setAdapterListener(mAdapterListener);
140        }
141        if (adapter != null && getVerticalGridView() != null) {
142            FocusHighlightHelper.setupHeaderItemFocusHighlight(getVerticalGridView());
143        }
144    }
145
146    void setBackgroundColor(int color) {
147        mBackgroundColor = color;
148        mBackgroundColorSet = true;
149
150        if (getVerticalGridView() != null) {
151            getVerticalGridView().setBackgroundColor(mBackgroundColor);
152        }
153    }
154
155    int getBackgroundColor() {
156        if (getActivity() == null) {
157            throw new IllegalStateException("Activity must be attached");
158        }
159
160        if (mBackgroundColorSet) {
161            return mBackgroundColor;
162        }
163
164        TypedValue outValue = new TypedValue();
165        getActivity().getTheme().resolveAttribute(android.R.attr.colorBackground, outValue, true);
166        return getResources().getColor(outValue.resourceId);
167    }
168}
169