| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.setupwizardlib.items; |
| |
| import android.util.SparseIntArray; |
| import android.view.LayoutInflater; |
| import android.view.View; |
| import android.view.ViewGroup; |
| import android.widget.BaseAdapter; |
| |
| /** |
| * An adapter typically used with ListView to display an {@link |
| * com.android.setupwizardlib.items.ItemHierarchy}. The item hierarchy used to create this adapter |
| * can be inflated by {@link ItemInflater} from XML. |
| */ |
| public class ItemAdapter extends BaseAdapter implements ItemHierarchy.Observer { |
| |
| private final ItemHierarchy itemHierarchy; |
| private final ViewTypes viewTypes = new ViewTypes(); |
| |
| public ItemAdapter(ItemHierarchy hierarchy) { |
| itemHierarchy = hierarchy; |
| itemHierarchy.registerObserver(this); |
| refreshViewTypes(); |
| } |
| |
| @Override |
| public int getCount() { |
| return itemHierarchy.getCount(); |
| } |
| |
| @Override |
| public IItem getItem(int position) { |
| return itemHierarchy.getItemAt(position); |
| } |
| |
| @Override |
| public long getItemId(int position) { |
| return position; |
| } |
| |
| @Override |
| public int getItemViewType(int position) { |
| IItem item = getItem(position); |
| int layoutRes = item.getLayoutResource(); |
| return viewTypes.get(layoutRes); |
| } |
| |
| @Override |
| public int getViewTypeCount() { |
| return viewTypes.size(); |
| } |
| |
| private void refreshViewTypes() { |
| for (int i = 0; i < getCount(); i++) { |
| IItem item = getItem(i); |
| viewTypes.add(item.getLayoutResource()); |
| } |
| } |
| |
| @Override |
| public View getView(int position, View convertView, ViewGroup parent) { |
| IItem item = getItem(position); |
| if (convertView == null) { |
| LayoutInflater inflater = LayoutInflater.from(parent.getContext()); |
| convertView = inflater.inflate(item.getLayoutResource(), parent, false); |
| } |
| item.onBindView(convertView); |
| return convertView; |
| } |
| |
| @Override |
| public void onChanged(ItemHierarchy hierarchy) { |
| refreshViewTypes(); |
| notifyDataSetChanged(); |
| } |
| |
| @Override |
| public void onItemRangeChanged(ItemHierarchy itemHierarchy, int positionStart, int itemCount) { |
| onChanged(itemHierarchy); |
| } |
| |
| @Override |
| public void onItemRangeInserted(ItemHierarchy itemHierarchy, int positionStart, int itemCount) { |
| onChanged(itemHierarchy); |
| } |
| |
| @Override |
| public void onItemRangeMoved( |
| ItemHierarchy itemHierarchy, int fromPosition, int toPosition, int itemCount) { |
| onChanged(itemHierarchy); |
| } |
| |
| @Override |
| public void onItemRangeRemoved(ItemHierarchy itemHierarchy, int positionStart, int itemCount) { |
| onChanged(itemHierarchy); |
| } |
| |
| @Override |
| public boolean isEnabled(int position) { |
| return getItem(position).isEnabled(); |
| } |
| |
| public ItemHierarchy findItemById(int id) { |
| return itemHierarchy.findItemById(id); |
| } |
| |
| public ItemHierarchy getRootItemHierarchy() { |
| return itemHierarchy; |
| } |
| |
| /** |
| * A helper class to pack a sparse set of integers (e.g. resource IDs) to a contiguous list of |
| * integers (e.g. adapter positions), providing mapping to retrieve the original ID from a given |
| * position. This is used to pack the view types of the adapter into contiguous integers from a |
| * given layout resource. |
| */ |
| private static class ViewTypes { |
| private final SparseIntArray positionMap = new SparseIntArray(); |
| private int nextPosition = 0; |
| |
| public int add(int id) { |
| if (positionMap.indexOfKey(id) < 0) { |
| positionMap.put(id, nextPosition); |
| nextPosition++; |
| } |
| return positionMap.get(id); |
| } |
| |
| public int size() { |
| return positionMap.size(); |
| } |
| |
| public int get(int id) { |
| return positionMap.get(id); |
| } |
| } |
| } |