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      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 
     17 package com.android.quicksearchbox.ui;
     18 
     19 import com.android.quicksearchbox.Corpus;
     20 import com.android.quicksearchbox.CorpusRanker;
     21 
     22 import android.database.DataSetObserver;
     23 import android.graphics.drawable.Drawable;
     24 import android.util.Log;
     25 import android.view.View;
     26 import android.view.ViewGroup;
     27 import android.widget.BaseAdapter;
     28 
     29 import java.util.List;
     30 
     31 /**
     32  * Adapter for showing a list of sources in the source selection activity.
     33  */
     34 public class CorporaAdapter extends BaseAdapter {
     35 
     36     private static final String TAG = "CorporaAdapter";
     37     private static final boolean DBG = false;
     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