HeadersFragment.java revision 056561d81012983d2d27b8665c4aeabb427174cb 
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 mHeadersEnabled = true;
51    private boolean mHeadersGone = false;
52    private int mBackgroundColor;
53    private boolean mBackgroundColorSet;
54
55    private static final PresenterSelector sHeaderPresenter = new SinglePresenterSelector(
56            new RowHeaderPresenter(R.layout.lb_header));
57
58    public HeadersFragment() {
59        setPresenterSelector(sHeaderPresenter);
60    }
61
62    public void setOnHeaderClickedListener(OnHeaderClickedListener listener) {
63        mOnHeaderClickedListener = listener;
64    }
65
66    public void setOnItemSelectedListener(OnItemSelectedListener listener) {
67        mOnItemSelectedListener = listener;
68    }
69
70    @Override
71    protected void onRowSelected(ViewGroup parent, View view, int position, long id) {
72        if (mOnItemSelectedListener != null) {
73            if (position >= 0) {
74                Row row = (Row) getAdapter().get(position);
75                mOnItemSelectedListener.onItemSelected(null, row);
76            } else {
77                mOnItemSelectedListener.onItemSelected(null, null);
78            }
79        }
80    }
81
82    private final ItemBridgeAdapter.AdapterListener mAdapterListener =
83            new ItemBridgeAdapter.AdapterListener() {
84        @Override
85        public void onCreate(ItemBridgeAdapter.ViewHolder viewHolder) {
86            View headerView = viewHolder.getViewHolder().view;
87            headerView.setOnClickListener(new View.OnClickListener() {
88                @Override
89                public void onClick(View v) {
90                    if (mOnHeaderClickedListener != null) {
91                        mOnHeaderClickedListener.onHeaderClicked();
92                    }
93                }
94            });
95            headerView.setFocusable(true);
96            headerView.setFocusableInTouchMode(true);
97            headerView.addOnLayoutChangeListener(sLayoutChangeListener);
98        }
99
100    };
101
102    private static OnLayoutChangeListener sLayoutChangeListener = new OnLayoutChangeListener() {
103        @Override
104        public void onLayoutChange(View v, int left, int top, int right, int bottom,
105            int oldLeft, int oldTop, int oldRight, int oldBottom) {
106            v.setPivotX(0);
107            v.setPivotY(v.getMeasuredHeight() / 2);
108        }
109    };
110
111    @Override
112    protected int getLayoutResourceId() {
113        return R.layout.lb_headers_fragment;
114    }
115
116    @Override
117    public void onViewCreated(View view, Bundle savedInstanceState) {
118        super.onViewCreated(view, savedInstanceState);
119        final VerticalGridView listView = getVerticalGridView();
120        if (listView == null) {
121            return;
122        }
123        if (getBridgeAdapter() != null) {
124            FocusHighlightHelper.setupHeaderItemFocusHighlight(listView);
125        }
126        listView.setBackgroundColor(getBackgroundColor());
127        listView.setVisibility(mHeadersGone ? View.GONE : View.VISIBLE);
128        listView.setLayoutEnabled(mHeadersEnabled);
129    }
130
131    void setHeadersEnabled(boolean enabled) {
132        mHeadersEnabled = enabled;
133        final VerticalGridView listView = getVerticalGridView();
134        if (listView != null) {
135            listView.setLayoutEnabled(mHeadersEnabled);
136        }
137    }
138
139    void setHeadersGone(boolean gone) {
140        mHeadersGone = gone;
141        final VerticalGridView listView = getVerticalGridView();
142        if (listView != null) {
143            listView.setVisibility(mHeadersGone ? View.GONE : View.VISIBLE);
144        }
145    }
146
147    @Override
148    protected void updateAdapter() {
149        super.updateAdapter();
150        ItemBridgeAdapter adapter = getBridgeAdapter();
151        if (adapter != null) {
152            adapter.setAdapterListener(mAdapterListener);
153        }
154        if (adapter != null && getVerticalGridView() != null) {
155            FocusHighlightHelper.setupHeaderItemFocusHighlight(getVerticalGridView());
156        }
157    }
158
159    void setBackgroundColor(int color) {
160        mBackgroundColor = color;
161        mBackgroundColorSet = true;
162
163        if (getVerticalGridView() != null) {
164            getVerticalGridView().setBackgroundColor(mBackgroundColor);
165        }
166    }
167
168    int getBackgroundColor() {
169        if (getActivity() == null) {
170            throw new IllegalStateException("Activity must be attached");
171        }
172
173        if (mBackgroundColorSet) {
174            return mBackgroundColor;
175        }
176
177        TypedValue outValue = new TypedValue();
178        getActivity().getTheme().resolveAttribute(R.attr.defaultBrandColor, outValue, true);
179        return getResources().getColor(outValue.resourceId);
180    }
181}
182