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package com.wireguard.android;
import android.content.Context;
import android.databinding.DataBindingUtil;
import android.databinding.ObservableList;
import android.databinding.ViewDataBinding;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListAdapter;
import java.lang.ref.WeakReference;
/**
* A generic ListAdapter backed by an ObservableList.
*/
class ObservableListAdapter<T> extends BaseAdapter implements ListAdapter {
private final OnListChangedCallback<T> callback = new OnListChangedCallback<>(this);
private final int layoutId;
private final LayoutInflater layoutInflater;
private ObservableList<T> list;
ObservableListAdapter(final Context context, final int layoutId, final ObservableList<T> list) {
this.layoutId = layoutId;
layoutInflater = LayoutInflater.from(context);
setList(list);
}
@Override
public int getCount() {
return list != null ? list.size() : 0;
}
@Override
public T getItem(final int position) {
return list != null ? list.get(position) : null;
}
@Override
public long getItemId(final int position) {
return position;
}
@Override
public View getView(final int position, final View convertView, final ViewGroup parent) {
ViewDataBinding binding = DataBindingUtil.getBinding(convertView);
if (binding == null)
binding = DataBindingUtil.inflate(layoutInflater, layoutId, parent, false);
binding.setVariable(BR.item, getItem(position));
binding.executePendingBindings();
return binding.getRoot();
}
public void setList(final ObservableList<T> newList) {
if (list != null)
list.removeOnListChangedCallback(callback);
list = newList;
if (list != null) {
list.addOnListChangedCallback(callback);
}
notifyDataSetChanged();
}
private static class OnListChangedCallback<U>
extends ObservableList.OnListChangedCallback<ObservableList<U>> {
private final WeakReference<ObservableListAdapter<U>> weakAdapter;
private OnListChangedCallback(final ObservableListAdapter<U> adapter) {
weakAdapter = new WeakReference<>(adapter);
}
@Override
public void onChanged(final ObservableList<U> sender) {
final ObservableListAdapter<U> adapter = weakAdapter.get();
if (adapter != null)
adapter.notifyDataSetChanged();
else
sender.removeOnListChangedCallback(this);
}
@Override
public void onItemRangeChanged(final ObservableList<U> sender, final int positionStart,
final int itemCount) {
onChanged(sender);
}
@Override
public void onItemRangeInserted(final ObservableList<U> sender, final int positionStart,
final int itemCount) {
onChanged(sender);
}
@Override
public void onItemRangeMoved(final ObservableList<U> sender, final int fromPosition,
final int toPosition, final int itemCount) {
onChanged(sender);
}
@Override
public void onItemRangeRemoved(final ObservableList<U> sender, final int positionStart,
final int itemCount) {
onChanged(sender);
}
}
}
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