1 files changed, 110 insertions, 0 deletions
diff --git a/app/src/main/java/com/wireguard/android/bindings/ObservableListAdapter.java b/app/src/main/java/com/wireguard/android/bindings/ObservableListAdapter.java
new file mode 100644
index 00000000..5b54ecaf
--- /dev/null
+++ b/app/src/main/java/com/wireguard/android/bindings/ObservableListAdapter.java
@@ -0,0 +1,110 @@
+package com.wireguard.android.bindings;
+
+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 com.wireguard.android.BR;
+
+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);
+        }
+    }
+}