113 lines
3.5 KiB
Java
113 lines
3.5 KiB
Java
package com.wireguard.android;
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import android.content.Context;
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import android.databinding.DataBindingUtil;
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import android.databinding.ObservableMap;
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import android.databinding.ViewDataBinding;
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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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import android.widget.ListAdapter;
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import java.lang.ref.WeakReference;
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import java.util.ArrayList;
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import java.util.Collections;
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/**
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* A generic ListAdapter backed by a TreeMap that adds observability.
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*/
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class ObservableMapAdapter<K extends Comparable<K>, V> extends BaseAdapter implements ListAdapter {
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private ArrayList<K> keys;
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private final int layoutId;
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private final LayoutInflater layoutInflater;
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private ObservableSortedMap<K, V> map;
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private final OnMapChangedCallback<K, V> callback = new OnMapChangedCallback<>(this);
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ObservableMapAdapter(final Context context, final int layoutId,
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final ObservableSortedMap<K, V> map) {
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layoutInflater = LayoutInflater.from(context);
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this.layoutId = layoutId;
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setMap(map);
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}
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@Override
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public int getCount() {
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return map != null ? map.size() : 0;
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}
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@Override
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public V getItem(final int position) {
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if (map == null || position < 0 || position >= map.size())
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return null;
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return map.get(getKeys().get(position));
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}
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@Override
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public long getItemId(final int position) {
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if (map == null || position < 0 || position >= map.size())
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return -1;
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return map.get(getKeys().get(position)).hashCode();
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}
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public int getItemPosition(final K key) {
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if (map == null)
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return -1;
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return Collections.binarySearch(getKeys(), key);
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}
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private ArrayList<K> getKeys() {
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if (keys == null)
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keys = new ArrayList<>(map.keySet());
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return keys;
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}
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@Override
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public View getView(final int position, final View convertView, final ViewGroup parent) {
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ViewDataBinding binding = DataBindingUtil.getBinding(convertView);
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if (binding == null)
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binding = DataBindingUtil.inflate(layoutInflater, layoutId, parent, false);
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binding.setVariable(BR.item, getItem(position));
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binding.executePendingBindings();
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return binding.getRoot();
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}
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@Override
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public boolean hasStableIds() {
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return true;
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}
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public void setMap(final ObservableSortedMap<K, V> newMap) {
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if (map != null)
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map.removeOnMapChangedCallback(callback);
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keys = null;
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map = newMap;
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if (map != null) {
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map.addOnMapChangedCallback(callback);
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}
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notifyDataSetChanged();
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}
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private static class OnMapChangedCallback<K extends Comparable<K>, V>
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extends ObservableMap.OnMapChangedCallback<ObservableSortedMap<K, V>, K, V> {
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private final WeakReference<ObservableMapAdapter<K, V>> weakAdapter;
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private OnMapChangedCallback(final ObservableMapAdapter<K, V> adapter) {
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weakAdapter = new WeakReference<>(adapter);
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}
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@Override
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public void onMapChanged(final ObservableSortedMap<K, V> sender, final K key) {
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final ObservableMapAdapter<K, V> adapter = weakAdapter.get();
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if (adapter != null) {
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adapter.keys = null;
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adapter.notifyDataSetChanged();
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} else {
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sender.removeOnMapChangedCallback(this);
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}
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}
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}
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}
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