1 /* 2 * Copyright (C) 2015 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.google.android.setupdesign.items; 18 19 import android.content.Context; 20 import android.content.res.TypedArray; 21 import android.util.AttributeSet; 22 import android.util.Log; 23 import com.google.android.setupdesign.R; 24 import java.util.ArrayList; 25 26 /** An abstract item hierarchy; provides default implementation for ID and observers. */ 27 public abstract class AbstractItemHierarchy implements ItemHierarchy { 28 29 /* static section */ 30 31 private static final String TAG = "AbstractItemHierarchy"; 32 33 /* non-static section */ 34 35 private final ArrayList<Observer> observers = new ArrayList<>(); 36 private int id = 0; 37 AbstractItemHierarchy()38 public AbstractItemHierarchy() {} 39 AbstractItemHierarchy(Context context, AttributeSet attrs)40 public AbstractItemHierarchy(Context context, AttributeSet attrs) { 41 TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.SudAbstractItem); 42 id = a.getResourceId(R.styleable.SudAbstractItem_android_id, 0); 43 a.recycle(); 44 } 45 setId(int id)46 public void setId(int id) { 47 this.id = id; 48 } 49 getId()50 public int getId() { 51 return id; 52 } 53 getViewId()54 public int getViewId() { 55 return getId(); 56 } 57 58 @Override registerObserver(Observer observer)59 public void registerObserver(Observer observer) { 60 observers.add(observer); 61 } 62 63 @Override unregisterObserver(Observer observer)64 public void unregisterObserver(Observer observer) { 65 observers.remove(observer); 66 } 67 68 /** @see Observer#onChanged(ItemHierarchy) */ notifyChanged()69 public void notifyChanged() { 70 for (Observer observer : observers) { 71 observer.onChanged(this); 72 } 73 } 74 75 /** @see Observer#onItemRangeChanged(ItemHierarchy, int, int) */ notifyItemRangeChanged(int position, int itemCount)76 public void notifyItemRangeChanged(int position, int itemCount) { 77 if (position < 0) { 78 Log.w(TAG, "notifyItemRangeChanged: Invalid position=" + position); 79 return; 80 } 81 if (itemCount < 0) { 82 Log.w(TAG, "notifyItemRangeChanged: Invalid itemCount=" + itemCount); 83 return; 84 } 85 86 for (Observer observer : observers) { 87 observer.onItemRangeChanged(this, position, itemCount); 88 } 89 } 90 91 /** @see Observer#onItemRangeInserted(ItemHierarchy, int, int) */ notifyItemRangeInserted(int position, int itemCount)92 public void notifyItemRangeInserted(int position, int itemCount) { 93 if (position < 0) { 94 Log.w(TAG, "notifyItemRangeInserted: Invalid position=" + position); 95 return; 96 } 97 if (itemCount < 0) { 98 Log.w(TAG, "notifyItemRangeInserted: Invalid itemCount=" + itemCount); 99 return; 100 } 101 102 for (Observer observer : observers) { 103 observer.onItemRangeInserted(this, position, itemCount); 104 } 105 } 106 107 /** @see Observer#onItemRangeMoved(ItemHierarchy, int, int, int) */ notifyItemRangeMoved(int fromPosition, int toPosition, int itemCount)108 public void notifyItemRangeMoved(int fromPosition, int toPosition, int itemCount) { 109 if (fromPosition < 0) { 110 Log.w(TAG, "notifyItemRangeMoved: Invalid fromPosition=" + fromPosition); 111 return; 112 } 113 if (toPosition < 0) { 114 Log.w(TAG, "notifyItemRangeMoved: Invalid toPosition=" + toPosition); 115 return; 116 } 117 if (itemCount < 0) { 118 Log.w(TAG, "notifyItemRangeMoved: Invalid itemCount=" + itemCount); 119 return; 120 } 121 122 for (Observer observer : observers) { 123 observer.onItemRangeMoved(this, fromPosition, toPosition, itemCount); 124 } 125 } 126 127 /** @see Observer#onItemRangeRemoved(ItemHierarchy, int, int) */ notifyItemRangeRemoved(int position, int itemCount)128 public void notifyItemRangeRemoved(int position, int itemCount) { 129 if (position < 0) { 130 Log.w(TAG, "notifyItemRangeInserted: Invalid position=" + position); 131 return; 132 } 133 if (itemCount < 0) { 134 Log.w(TAG, "notifyItemRangeInserted: Invalid itemCount=" + itemCount); 135 return; 136 } 137 138 for (Observer observer : observers) { 139 observer.onItemRangeRemoved(this, position, itemCount); 140 } 141 } 142 } 143