stats on filtered collection pages

lib/widgets/album/filtered_collection_page.dart

@@ -1,8 +1,12 @@
 import 'package:aves/model/collection_filters.dart';
 import 'package:aves/model/collection_lens.dart';
+import 'package:aves/widgets/album/all_collection_page.dart';
 import 'package:aves/widgets/album/thumbnail_collection.dart';
+import 'package:aves/widgets/common/menu_row.dart';
 import 'package:aves/widgets/common/providers/media_query_data_provider.dart';
+import 'package:aves/widgets/stats.dart';
 import 'package:flutter/material.dart';
+import 'package:outline_material_icons/outline_material_icons.dart';
 import 'package:provider/provider.dart';
 
 class FilteredCollectionPage extends StatelessWidget {
@@ -23,6 +27,7 @@ class FilteredCollectionPage extends StatelessWidget {
           child: ThumbnailCollection(
             appBar: SliverAppBar(
               title: Text(title),
+              actions: _buildActions(),
               floating: true,
             ),
           ),
@@ -31,4 +36,43 @@ class FilteredCollectionPage extends StatelessWidget {
       ),
     );
   }
+
+  static List<Widget> _buildActions() {
+    return [
+      Builder(
+        builder: (context) => Consumer<CollectionLens>(
+          builder: (context, collection, child) => PopupMenuButton<AlbumAction>(
+            itemBuilder: (context) => [
+              PopupMenuItem(
+                value: AlbumAction.stats,
+                child: MenuRow(text: 'Stats', icon: OMIcons.pieChart),
+              ),
+            ],
+            onSelected: (action) => _onActionSelected(context, collection, action),
+          ),
+        ),
+      ),
+    ];
+  }
+
+  static void _onActionSelected(BuildContext context, CollectionLens collection, AlbumAction action) {
+    switch (action) {
+      case AlbumAction.stats:
+        _goToStats(context, collection);
+        break;
+      default:
+        break;
+    }
+  }
+
+  static Future _goToStats(BuildContext context, CollectionLens collection) {
+    return Navigator.push(
+      context,
+      MaterialPageRoute(
+        builder: (context) => StatsPage(
+          collection: collection,
+        ),
+      ),
+    );
+  }
 }