1 /* 2 * Copyright (C) 2009 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.camera; 18 19 import android.content.Context; 20 import android.util.AttributeSet; 21 22 import java.util.ArrayList; 23 24 /** 25 * A collection of <code>CameraPreference</code>s. It may contain other 26 * <code>PreferenceGroup</code> and form a tree structure. 27 */ 28 public class PreferenceGroup extends CameraPreference { 29 private ArrayList<CameraPreference> list = 30 new ArrayList<CameraPreference>(); 31 32 public PreferenceGroup(Context context, AttributeSet attrs) { 33 super(context, attrs); 34 } 35 36 public void addChild(CameraPreference child) { 37 list.add(child); 38 } 39 40 public void removePreference(int index) { 41 list.remove(index); 42 } 43 44 public CameraPreference get(int index) { 45 return list.get(index); 46 } 47 48 public int size() { 49 return list.size(); 50 } 51 52 @Override 53 public void reloadValue() { 54 for (CameraPreference pref : list) { 55 pref.reloadValue(); 56 } 57 } 58 59 /** 60 * Finds the preference with the given key recursively. Returns 61 * <code>null</code> if cannot find. 62 */ 63 public ListPreference findPreference(String key) { 64 // Find a leaf preference with the given key. Currently, the base 65 // type of all "leaf" preference is "ListPreference". If we add some 66 // other types later, we need to change the code. 67 for (CameraPreference pref : list) { 68 if (pref instanceof ListPreference) { 69 ListPreference listPref = (ListPreference) pref; 70 if(listPref.getKey().equals(key)) return listPref; 71 } else if(pref instanceof PreferenceGroup) { 72 ListPreference listPref = 73 ((PreferenceGroup) pref).findPreference(key); 74 if (listPref != null) return listPref; 75 } 76 } 77 return null; 78 } 79 } 80
