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