AppListDialogFragment: add implementation for excluding applications

Signed-off-by: Eric Kuck <eric@bluelinelabs.com>

app/src/main/java/com/wireguard/android/databinding/BindingAdapters.java

@@ -9,16 +9,18 @@ package com.wireguard.android.databinding;
 import android.databinding.BindingAdapter;
 import android.databinding.ObservableList;
 import android.databinding.adapters.ListenerUtil;
+import android.support.v7.widget.LinearLayoutManager;
+import android.support.v7.widget.RecyclerView;
 import android.text.InputFilter;
 import android.widget.LinearLayout;
 import android.widget.ListView;
 import android.widget.TextView;
 
 import com.wireguard.android.R;
-import com.wireguard.util.Keyed;
 import com.wireguard.android.util.ObservableKeyedList;
 import com.wireguard.android.widget.ToggleSwitch;
 import com.wireguard.android.widget.ToggleSwitch.OnBeforeCheckedChangeListener;
+import com.wireguard.util.Keyed;
 
 /**
  * Static methods for use by generated code in the Android data binding library.
@@ -91,9 +93,39 @@ public final class BindingAdapters {
         adapter.setList(newList);
     }
 
+    @BindingAdapter({"items", "layout"})
+    public static <K, E extends Keyed<? extends K>>
+    void setItems(final RecyclerView view,
+                  final ObservableKeyedList<K, E> oldList, final int oldLayoutId,
+                  final ObservableKeyedList<K, E> newList, final int newLayoutId) {
+        if (view.getLayoutManager() == null)
+            view.setLayoutManager(new LinearLayoutManager(view.getContext(), RecyclerView.VERTICAL, false));
+
+        if (oldList == newList && oldLayoutId == newLayoutId)
+            return;
+        // The ListAdapter interface is not generic, so this cannot be checked.
+        @SuppressWarnings("unchecked") ObservableKeyedRecyclerViewAdapter<K, E> adapter =
+                (ObservableKeyedRecyclerViewAdapter<K, E>) view.getAdapter();
+        // If the layout changes, any existing adapter must be replaced.
+        if (adapter != null && oldList != null && oldLayoutId != newLayoutId) {
+            adapter.setList(null);
+            adapter = null;
+        }
+        // Avoid setting an adapter when there is no new list or layout.
+        if (newList == null || newLayoutId == 0)
+            return;
+        if (adapter == null) {
+            adapter = new ObservableKeyedRecyclerViewAdapter<>(view.getContext(), newLayoutId, newList);
+            view.setAdapter(adapter);
+        }
+        // Either the list changed, or this is an entirely new listener because the layout changed.
+        adapter.setList(newList);
+    }
+
     @BindingAdapter("onBeforeCheckedChanged")
     public static void setOnBeforeCheckedChanged(final ToggleSwitch view,
                                                  final OnBeforeCheckedChangeListener listener) {
         view.setOnBeforeCheckedChangeListener(listener);
     }
+
 }

app/src/main/java/com/wireguard/android/databinding/ObservableKeyedRecyclerViewAdapter.java

@@ -0,0 +1,135 @@
+package com.wireguard.android.databinding;
+
+import android.content.Context;
+import android.databinding.DataBindingUtil;
+import android.databinding.ObservableList;
+import android.databinding.ViewDataBinding;
+import android.support.annotation.NonNull;
+import android.support.v7.widget.RecyclerView;
+import android.support.v7.widget.RecyclerView.Adapter;
+import android.view.LayoutInflater;
+import android.view.ViewGroup;
+
+import com.wireguard.android.BR;
+import com.wireguard.android.util.ObservableKeyedList;
+import com.wireguard.util.Keyed;
+
+import java.lang.ref.WeakReference;
+
+/**
+ * A generic {@code RecyclerView.Adapter} backed by a {@code ObservableKeyedList}.
+ */
+
+class ObservableKeyedRecyclerViewAdapter<K, E extends Keyed<? extends K>> extends Adapter<ObservableKeyedRecyclerViewAdapter.ViewHolder> {
+
+    private final OnListChangedCallback<E> callback = new OnListChangedCallback<>(this);
+    private final int layoutId;
+    private final LayoutInflater layoutInflater;
+    private ObservableKeyedList<K, E> list;
+
+    ObservableKeyedRecyclerViewAdapter(final Context context, final int layoutId,
+                                       final ObservableKeyedList<K, E> list) {
+        this.layoutId = layoutId;
+        layoutInflater = LayoutInflater.from(context);
+        setList(list);
+    }
+
+    @Override
+    public int getItemCount() {
+        return list != null ? list.size() : 0;
+    }
+
+    private E getItem(final int position) {
+        if (list == null || position < 0 || position >= list.size())
+            return null;
+        return list.get(position);
+    }
+
+    @Override
+    public long getItemId(final int position) {
+        final K key = getKey(position);
+        return key != null ? key.hashCode() : -1;
+    }
+
+    private K getKey(final int position) {
+        final E item = getItem(position);
+        return item != null ? item.getKey() : null;
+    }
+
+    @NonNull @Override
+    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
+        return new ViewHolder(DataBindingUtil.inflate(layoutInflater, layoutId, parent, false));
+    }
+
+    @Override
+    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
+        holder.binding.setVariable(BR.collection, list);
+        holder.binding.setVariable(BR.key, getKey(position));
+        holder.binding.setVariable(BR.item, getItem(position));
+        holder.binding.executePendingBindings();
+    }
+
+    void setList(final ObservableKeyedList<K, E> newList) {
+        if (list != null)
+            list.removeOnListChangedCallback(callback);
+        list = newList;
+        if (list != null) {
+            list.addOnListChangedCallback(callback);
+        }
+        notifyDataSetChanged();
+    }
+
+    private static final class OnListChangedCallback<E extends Keyed<?>>
+            extends ObservableList.OnListChangedCallback<ObservableList<E>> {
+
+        private final WeakReference<ObservableKeyedRecyclerViewAdapter<?, E>> weakAdapter;
+
+        private OnListChangedCallback(final ObservableKeyedRecyclerViewAdapter<?, E> adapter) {
+            weakAdapter = new WeakReference<>(adapter);
+        }
+
+        @Override
+        public void onChanged(final ObservableList<E> sender) {
+            final ObservableKeyedRecyclerViewAdapter adapter = weakAdapter.get();
+            if (adapter != null)
+                adapter.notifyDataSetChanged();
+            else
+                sender.removeOnListChangedCallback(this);
+        }
+
+        @Override
+        public void onItemRangeChanged(final ObservableList<E> sender, final int positionStart,
+                                       final int itemCount) {
+            onChanged(sender);
+        }
+
+        @Override
+        public void onItemRangeInserted(final ObservableList<E> sender, final int positionStart,
+                                        final int itemCount) {
+            onChanged(sender);
+        }
+
+        @Override
+        public void onItemRangeMoved(final ObservableList<E> sender, final int fromPosition,
+                                     final int toPosition, final int itemCount) {
+            onChanged(sender);
+        }
+
+        @Override
+        public void onItemRangeRemoved(final ObservableList<E> sender, final int positionStart,
+                                       final int itemCount) {
+            onChanged(sender);
+        }
+    }
+
+    public static class ViewHolder extends RecyclerView.ViewHolder {
+        final ViewDataBinding binding;
+
+        public ViewHolder(ViewDataBinding binding) {
+            super(binding.getRoot());
+
+            this.binding = binding;
+        }
+    }
+
+}