1/*
2 * Copyright (C) 2013 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.gallery3d.ingest.adapter;
18
19import java.util.ArrayList;
20import java.util.Collection;
21
22public abstract class CheckBroker {
23    private Collection<OnCheckedChangedListener> mListeners =
24            new ArrayList<OnCheckedChangedListener>();
25
26    public interface OnCheckedChangedListener {
27        public void onCheckedChanged(int position, boolean isChecked);
28        public void onBulkCheckedChanged();
29    }
30
31    public abstract void setItemChecked(int position, boolean checked);
32
33    public void onCheckedChange(int position, boolean checked) {
34        if (isItemChecked(position) != checked) {
35            for (OnCheckedChangedListener l : mListeners) {
36                l.onCheckedChanged(position, checked);
37            }
38        }
39    }
40
41    public void onBulkCheckedChange() {
42        for (OnCheckedChangedListener l : mListeners) {
43            l.onBulkCheckedChanged();
44        }
45    }
46
47    public abstract boolean isItemChecked(int position);
48
49    public void registerOnCheckedChangeListener(OnCheckedChangedListener l) {
50        mListeners.add(l);
51    }
52
53    public void unregisterOnCheckedChangeListener(OnCheckedChangedListener l) {
54        mListeners.remove(l);
55    }
56}
57