/*
* Copyright (c) 2014 OpenSilk Productions LLC
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.opensilk.common.ui.recycler;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.ViewGroup;
/**
* Created by drew on 11/23/14.
*/
public class HeaderRecyclerAdapter<VH extends RecyclerView.ViewHolder> extends RecyclerListAdapter<View, RecyclerView.ViewHolder> {
protected final RecyclerListAdapter<?, VH> wrappedAdapter;
public HeaderRecyclerAdapter(RecyclerListAdapter<?, VH> wrappedAdapter) {
super();
this.wrappedAdapter = wrappedAdapter;
this.wrappedAdapter.registerAdapterDataObserver(observer);
}
public void addHeader(View v) {
addItem(v);
}
public int getNumHeaders() {
return getItems().size();
}
@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
wrappedAdapter.onAttachedToRecyclerView(recyclerView);
}
@Override
public void onDetachedFromRecyclerView(RecyclerView recyclerView) {
wrappedAdapter.onDetachedFromRecyclerView(recyclerView);
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
if (i < 0) {
return new RecyclerView.ViewHolder(getItem((i + 1) * -1)) {};
}
return wrappedAdapter.onCreateViewHolder(viewGroup, i);
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int i) {
if (i < getNumHeaders()) {
return;
}
wrappedAdapter.onBindViewHolder((VH)viewHolder, i - getNumHeaders());
}
@Override
public int getItemCount() {
return super.getItemCount() + wrappedAdapter.getItemCount();
}
@Override
public int getItemViewType(int position) {
if (position < getNumHeaders()) {
return (position * -1) - 1;
}
return wrappedAdapter.getItemViewType(position - getNumHeaders());
}
final RecyclerView.AdapterDataObserver observer = new RecyclerView.AdapterDataObserver() {
@Override
public void onChanged() {
notifyDataSetChanged();
}
@Override
public void onItemRangeChanged(int positionStart, int itemCount) {
notifyItemRangeChanged(positionStart + getNumHeaders(), itemCount);
}
@Override
public void onItemRangeInserted(int positionStart, int itemCount) {
notifyItemRangeInserted(positionStart + getNumHeaders(), itemCount);
}
@Override
public void onItemRangeRemoved(int positionStart, int itemCount) {
notifyItemRangeRemoved(positionStart + getNumHeaders(), itemCount);
}
@Override
public void onItemRangeMoved(int fromPosition, int toPosition, int itemCount) {
notifyItemMoved(fromPosition + getNumHeaders(), toPosition + getNumHeaders());
}
@Override
public void onItemRangeChanged(int positionStart, int itemCount, Object payload) {
notifyItemRangeChanged(positionStart, itemCount, payload);
}
};
}