CorporaAdapter.java revision ce4cdcf739b57563ddcdbed6944128b8c1f7522a 
1/*
2 * Copyright (C) 2009 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.quicksearchbox.ui;
18
19import com.android.quicksearchbox.Corpus;
20import com.android.quicksearchbox.CorpusRanker;
21
22import android.database.DataSetObserver;
23import android.graphics.drawable.Drawable;
24import android.util.Log;
25import android.view.View;
26import android.view.ViewGroup;
27import android.widget.BaseAdapter;
28
29import java.util.List;
30
31/**
32 * Adapter for showing a list of sources in the source selection activity.
33 */
34public class CorporaAdapter extends BaseAdapter {
35
36    private static final String TAG = "CorporaAdapter";
37    private static final boolean DBG = true;
38
39    private final CorpusViewFactory mViewFactory;
40
41    private final CorpusRanker mRanker;
42
43    private final DataSetObserver mCorporaObserver = new CorporaObserver();
44
45    private List<Corpus> mRankedEnabledCorpora;
46
47    private boolean mGridView;
48
49    private CorporaAdapter(CorpusViewFactory viewFactory,
50            CorpusRanker ranker, boolean gridView) {
51        mViewFactory = viewFactory;
52        mRanker = ranker;
53        mGridView = gridView;
54        mRanker.registerDataSetObserver(mCorporaObserver);
55        updateCorpora();
56    }
57
58    public static CorporaAdapter createListAdapter(CorpusViewFactory viewFactory,
59            CorpusRanker ranker) {
60        return new CorporaAdapter(viewFactory, ranker, false);
61    }
62
63    public static CorporaAdapter createGridAdapter(CorpusViewFactory viewFactory,
64            CorpusRanker ranker) {
65        return new CorporaAdapter(viewFactory, ranker, true);
66    }
67
68    private void updateCorpora() {
69        mRankedEnabledCorpora = mRanker.getRankedCorpora();
70        notifyDataSetChanged();
71    }
72
73    public void close() {
74        mRanker.unregisterDataSetObserver(mCorporaObserver);
75    }
76
77    public int getCount() {
78        return 1 + mRankedEnabledCorpora.size();
79    }
80
81    public Corpus getItem(int position) {
82        if (position == 0) {
83            return null;
84        } else {
85            return mRankedEnabledCorpora.get(position - 1);
86        }
87    }
88
89    public long getItemId(int position) {
90        return position;
91    }
92
93    /**
94     * Gets the position of the given corpus.
95     */
96    public int getCorpusPosition(Corpus corpus) {
97        if (corpus == null) {
98            return 0;
99        }
100        int count = getCount();
101        for (int i = 0; i < count; i++) {
102            if (corpus.equals(getItem(i))) {
103                return i;
104            }
105        }
106        Log.w(TAG, "Corpus not in adapter: " + corpus);
107        return 0;
108    }
109
110    public View getView(int position, View convertView, ViewGroup parent) {
111        CorpusView view = (CorpusView) convertView;
112        if (view == null) {
113            view = createView(parent);
114        }
115        Corpus corpus = getItem(position);
116        Drawable icon;
117        CharSequence label;
118        if (corpus == null) {
119            icon = mViewFactory.getGlobalSearchIcon();
120            label = mViewFactory.getGlobalSearchLabel();
121        } else {
122            icon = corpus.getCorpusIcon();
123            label = corpus.getLabel();
124        }
125        if (DBG) Log.d(TAG, "Binding " + position + ", label=" + label);
126        view.setIcon(icon);
127        view.setLabel(label);
128        return view;
129    }
130
131    protected CorpusView createView(ViewGroup parent) {
132        if (mGridView) {
133            return mViewFactory.createGridCorpusView(parent);
134        } else {
135            return mViewFactory.createListCorpusView(parent);
136        }
137    }
138
139    private class CorporaObserver extends DataSetObserver {
140        @Override
141        public void onChanged() {
142            updateCorpora();
143        }
144
145        @Override
146        public void onInvalidated() {
147            updateCorpora();
148        }
149    }
150
151}
152