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.SuggestionCursor; 20 import com.android.quicksearchbox.Suggestions; 21 22 import android.content.Context; 23 import android.database.DataSetObserver; 24 import android.view.ViewGroup; 25 26 /** 27 * View shown at the bottom of the suggestions list. 28 */ 29 public abstract class SuggestionsFooter { 30 31 private final DataSetObserver mDataSetObserver = new AdapterObserver(); 32 33 private final Context mContext; 34 35 private SuggestionsAdapter mAdapter; 36 37 public SuggestionsFooter(Context context) { 38 mContext = context; 39 } 40 41 public abstract void addToContainer(ViewGroup parent); 42 43 protected abstract void onSuggestionsChanged(); 44 45 protected Context getContext() { 46 return mContext; 47 } 48 49 public void setAdapter(SuggestionsAdapter adapter) { 50 if (mAdapter == adapter) { 51 return; 52 } 53 if (mAdapter != null) { 54 mAdapter.unregisterDataSetObserver(mDataSetObserver); 55 } 56 mAdapter = adapter; 57 if (mAdapter != null) { 58 mAdapter.registerDataSetObserver(mDataSetObserver); 59 } 60 onSuggestionsChanged(); 61 } 62 63 protected Suggestions getSuggestions() { 64 return mAdapter == null ? null : mAdapter.getSuggestions(); 65 } 66 67 protected SuggestionCursor getCurrentSuggestions() { 68 return mAdapter == null ? null : mAdapter.getCurrentSuggestions(); 69 } 70 71 private class AdapterObserver extends DataSetObserver { 72 @Override 73 public void onChanged() { 74 onSuggestionsChanged(); 75 } 76 77 @Override 78 public void onInvalidated() { 79 onSuggestionsChanged(); 80 } 81 } 82 83 } 84
