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package com.wireguard.android;
import android.content.Context;
import android.databinding.DataBindingUtil;
import android.databinding.ObservableArrayMap;
import android.databinding.ObservableMap;
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 ObservableMap.
*/
class ObservableArrayMapAdapter<K, V> extends BaseAdapter implements ListAdapter {
private final int layoutId;
private final LayoutInflater layoutInflater;
private ObservableArrayMap<K, V> map;
private final OnMapChangedCallback<K, V> callback = new OnMapChangedCallback<>(this);
ObservableArrayMapAdapter(Context context, int layoutId, ObservableArrayMap<K, V> map) {
this.layoutInflater = LayoutInflater.from(context);
this.layoutId = layoutId;
setMap(map);
}
@Override
public int getCount() {
return map != null ? map.size() : 0;
}
@Override
public V getItem(int position) {
return map != null ? map.get(map.keyAt(position)) : null;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, 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 setMap(ObservableArrayMap<K, V> newMap) {
if (map != null)
map.removeOnMapChangedCallback(callback);
map = newMap;
if (map != null) {
map.addOnMapChangedCallback(callback);
}
}
private static class OnMapChangedCallback<K, V>
extends ObservableMap.OnMapChangedCallback<ObservableMap<K, V>, K, V> {
private final WeakReference<ObservableArrayMapAdapter<K, V>> weakAdapter;
private OnMapChangedCallback(ObservableArrayMapAdapter<K, V> adapter) {
weakAdapter = new WeakReference<>(adapter);
}
@Override
public void onMapChanged(ObservableMap<K, V> sender, K key) {
final ObservableArrayMapAdapter<K, V> adapter = weakAdapter.get();
if (adapter != null)
adapter.notifyDataSetChanged();
else
sender.removeOnMapChangedCallback(this);
}
}
}
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