| /* |
| * Copyright (C) 2007 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.widget; |
| |
| import android.database.Cursor; |
| |
| /** |
| * <p>The CursorFilter delegates most of the work to the CursorAdapter. |
| * Subclasses should override these delegate methods to run the queries |
| * and convert the results into String that can be used by auto-completion |
| * widgets.</p> |
| */ |
| class CursorFilter extends Filter { |
| |
| CursorFilterClient mClient; |
| |
| interface CursorFilterClient { |
| CharSequence convertToString(Cursor cursor); |
| Cursor runQueryOnBackgroundThread(CharSequence constraint); |
| Cursor getCursor(); |
| void changeCursor(Cursor cursor); |
| } |
| |
| CursorFilter(CursorFilterClient client) { |
| mClient = client; |
| } |
| |
| @Override |
| public CharSequence convertResultToString(Object resultValue) { |
| return mClient.convertToString((Cursor) resultValue); |
| } |
| |
| @Override |
| protected FilterResults performFiltering(CharSequence constraint) { |
| Cursor cursor = mClient.runQueryOnBackgroundThread(constraint); |
| |
| FilterResults results = new FilterResults(); |
| if (cursor != null) { |
| results.count = cursor.getCount(); |
| results.values = cursor; |
| } else { |
| results.count = 0; |
| results.values = null; |
| } |
| return results; |
| } |
| |
| @Override |
| protected void publishResults(CharSequence constraint, FilterResults results) { |
| Cursor oldCursor = mClient.getCursor(); |
| |
| if (results.values != null && results.values != oldCursor) { |
| mClient.changeCursor((Cursor) results.values); |
| } |
| } |
| } |