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 
17 package com.android.gallery3d.ingest.adapter;
18 
19 import android.annotation.TargetApi;
20 import android.os.Build;
21 
22 import java.util.ArrayList;
23 import java.util.Collection;
24 
25 /**
26  * Helper to keep checked state in sync.
27  */
28 @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR1)
29 public abstract class CheckBroker {
30   private Collection<OnCheckedChangedListener> mListeners =
31       new ArrayList<OnCheckedChangedListener>();
32 
33   /**
34    * Listener for item checked state changes.
35    */
36   public interface OnCheckedChangedListener {
onCheckedChanged(int position, boolean isChecked)37     public void onCheckedChanged(int position, boolean isChecked);
38 
onBulkCheckedChanged()39     public void onBulkCheckedChanged();
40   }
41 
setItemChecked(int position, boolean checked)42   public abstract void setItemChecked(int position, boolean checked);
43 
onCheckedChange(int position, boolean checked)44   public void onCheckedChange(int position, boolean checked) {
45     if (isItemChecked(position) != checked) {
46       for (OnCheckedChangedListener l : mListeners) {
47         l.onCheckedChanged(position, checked);
48       }
49     }
50   }
51 
onBulkCheckedChange()52   public void onBulkCheckedChange() {
53     for (OnCheckedChangedListener l : mListeners) {
54       l.onBulkCheckedChanged();
55     }
56   }
57 
isItemChecked(int position)58   public abstract boolean isItemChecked(int position);
59 
registerOnCheckedChangeListener(OnCheckedChangedListener l)60   public void registerOnCheckedChangeListener(OnCheckedChangedListener l) {
61     mListeners.add(l);
62   }
63 
unregisterOnCheckedChangeListener(OnCheckedChangedListener l)64   public void unregisterOnCheckedChangeListener(OnCheckedChangedListener l) {
65     mListeners.remove(l);
66   }
67 }
68