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 { 37 public void onCheckedChanged(int position, boolean isChecked); 38 39 public void onBulkCheckedChanged(); 40 } 41 42 public abstract void setItemChecked(int position, boolean checked); 43 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 52 public void onBulkCheckedChange() { 53 for (OnCheckedChangedListener l : mListeners) { 54 l.onBulkCheckedChanged(); 55 } 56 } 57 58 public abstract boolean isItemChecked(int position); 59 60 public void registerOnCheckedChangeListener(OnCheckedChangedListener l) { 61 mListeners.add(l); 62 } 63 64 public void unregisterOnCheckedChangeListener(OnCheckedChangedListener l) { 65 mListeners.remove(l); 66 } 67 } 68
