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/*
* 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);
}
}
}
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