811a5a4a |
1 | /* |
2 | * Copyright (C) 2011 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 android.support.v2.widget; |
18 | |
19 | import android.database.Cursor; |
20 | import android.widget.Filter; |
21 | |
22 | /** |
23 | * <p>The CursorFilter delegates most of the work to the CursorAdapter. |
24 | * Subclasses should override these delegate methods to run the queries |
25 | * and convert the results into String that can be used by auto-completion |
26 | * widgets.</p> |
27 | */ |
28 | class CursorFilter extends Filter { |
29 | |
30 | CursorFilterClient mClient; |
31 | |
32 | interface CursorFilterClient { |
33 | CharSequence convertToString(Cursor cursor); |
34 | Cursor runQueryOnBackgroundThread(CharSequence constraint); |
35 | Cursor getCursor(); |
36 | void changeCursor(Cursor cursor); |
37 | } |
38 | |
39 | CursorFilter(CursorFilterClient client) { |
40 | mClient = client; |
41 | } |
42 | |
43 | @Override |
44 | public CharSequence convertResultToString(Object resultValue) { |
45 | return mClient.convertToString((Cursor) resultValue); |
46 | } |
47 | |
48 | @Override |
49 | protected FilterResults performFiltering(CharSequence constraint) { |
50 | Cursor cursor = mClient.runQueryOnBackgroundThread(constraint); |
51 | |
52 | FilterResults results = new FilterResults(); |
53 | if (cursor != null) { |
54 | results.count = cursor.getCount(); |
55 | results.values = cursor; |
56 | } else { |
57 | results.count = 0; |
58 | results.values = null; |
59 | } |
60 | return results; |
61 | } |
62 | |
63 | @Override |
64 | protected void publishResults(CharSequence constraint, FilterResults results) { |
65 | Cursor oldCursor = mClient.getCursor(); |
66 | |
67 | if (results.values != null && results.values != oldCursor) { |
68 | mClient.changeCursor((Cursor) results.values); |
69 | } |
70 | } |
71 | } |