search: custom app bar

lib/main.dart

@@ -94,23 +94,21 @@ class _HomePageState extends State<HomePage> {
 
   @override
   Widget build(BuildContext context) {
-    return MediaQueryDataProvider(
-      child: FutureBuilder(
-          future: _appSetup,
-          builder: (context, AsyncSnapshot<void> snapshot) {
-            if (snapshot.hasError) return const Icon(OMIcons.error);
-            if (snapshot.connectionState != ConnectionState.done) return const SizedBox.shrink();
-            debugPrint('$runtimeType FutureBuilder builder');
-            return _sharedEntry != null
-                ? SingleFullscreenPage(
-                    entry: _sharedEntry,
-                  )
-                : MediaStoreCollectionProvider(
-                    child: Consumer<CollectionLens>(
-                      builder: (context, collection, child) => CollectionPage(collection),
-                    ),
-                  );
-          }),
-    );
+    return FutureBuilder(
+        future: _appSetup,
+        builder: (context, AsyncSnapshot<void> snapshot) {
+          if (snapshot.hasError) return const Icon(OMIcons.error);
+          if (snapshot.connectionState != ConnectionState.done) return const SizedBox.shrink();
+          debugPrint('$runtimeType app setup future complete');
+          return _sharedEntry != null
+              ? SingleFullscreenPage(
+                  entry: _sharedEntry,
+                )
+              : MediaStoreCollectionProvider(
+                  child: Consumer<CollectionLens>(
+                    builder: (context, collection, child) => CollectionPage(collection),
+                  ),
+                );
+        });
   }
 }

lib/model/collection_lens.dart

@@ -74,9 +74,19 @@ class CollectionLens with ChangeNotifier {
 
   Object heroTag(ImageEntry entry) => '$hashCode${entry.uri}';
 
+  void addFilter(CollectionFilter filter) {
+    if (filters.contains(filter)) return;
+    filters.add(filter);
+    onFilterChanged();
+  }
+
   void removeFilter(CollectionFilter filter) {
     if (!filters.contains(filter)) return;
     filters.remove(filter);
+    onFilterChanged();
+  }
+
+  void onFilterChanged() {
     _applyFilters();
     _applySort();
     _applyGroup();

lib/widgets/album/collection_app_bar.dart

@@ -1,35 +1,138 @@
 import 'package:aves/model/collection_lens.dart';
+import 'package:aves/model/filters/query.dart';
 import 'package:aves/model/settings.dart';
+import 'package:aves/widgets/album/collection_page.dart';
 import 'package:aves/widgets/album/filter_bar.dart';
-import 'package:aves/widgets/album/search_delegate.dart';
 import 'package:aves/widgets/common/menu_row.dart';
 import 'package:aves/widgets/stats.dart';
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:outline_material_icons/outline_material_icons.dart';
 import 'package:pedantic/pedantic.dart';
 import 'package:provider/provider.dart';
 
-class AllCollectionAppBar extends SliverAppBar {
-  AllCollectionAppBar()
-      : super(
-          title: const Text('Aves'),
+class CollectionAppBar extends StatefulWidget implements PreferredSizeWidget {
+  final ValueNotifier<PageState> stateNotifier;
+
+  @override
+  final Size preferredSize = Size.fromHeight(kToolbarHeight + FilterBar.preferredHeight);
+
+  CollectionAppBar({this.stateNotifier});
+
+  @override
+  _CollectionAppBarState createState() => _CollectionAppBarState();
+}
+
+class _CollectionAppBarState extends State<CollectionAppBar> with SingleTickerProviderStateMixin {
+  final TextEditingController _searchFieldController = TextEditingController();
+
+  AnimationController _browseToSearchAnimation;
+
+  ValueNotifier<PageState> get stateNotifier => widget.stateNotifier;
+
+  @override
+  void initState() {
+    super.initState();
+    _browseToSearchAnimation = AnimationController(
+      duration: const Duration(milliseconds: 300),
+      vsync: this,
+    );
+    _registerWidget(widget);
+  }
+
+  @override
+  void didUpdateWidget(CollectionAppBar oldWidget) {
+    super.didUpdateWidget(oldWidget);
+    _unregisterWidget(oldWidget);
+    _registerWidget(widget);
+  }
+
+  @override
+  void dispose() {
+    _unregisterWidget(widget);
+    _browseToSearchAnimation.dispose();
+    super.dispose();
+  }
+
+  void _registerWidget(CollectionAppBar widget) {
+    stateNotifier.addListener(_onStateChange);
+  }
+
+  void _unregisterWidget(CollectionAppBar widget) {
+    stateNotifier.removeListener(_onStateChange);
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return ValueListenableBuilder<PageState>(
+      valueListenable: stateNotifier,
+      builder: (context, state, child) {
+        debugPrint('$runtimeType builder state=$state');
+        return SliverAppBar(
+          leading: _buildAppBarLeading(),
+          title: _buildAppBarTitle(),
           actions: _buildActions(),
           bottom: FilterBar(),
           floating: true,
         );
+      },
+    );
+  }
 
-  static List<Widget> _buildActions() {
+  Widget _buildAppBarLeading() {
+    VoidCallback onPressed;
+    String tooltip;
+    switch (stateNotifier.value) {
+      case PageState.browse:
+        onPressed = () => Scaffold.of(context).openDrawer();
+        tooltip = MaterialLocalizations.of(context).openAppDrawerTooltip;
+        break;
+      case PageState.search:
+        onPressed = () => stateNotifier.value = PageState.browse;
+        tooltip = MaterialLocalizations.of(context).backButtonTooltip;
+        break;
+    }
+    return IconButton(
+      icon: AnimatedIcon(
+        icon: AnimatedIcons.menu_arrow,
+        progress: _browseToSearchAnimation,
+      ),
+      onPressed: onPressed,
+      tooltip: tooltip,
+    );
+  }
+
+  Widget _buildAppBarTitle() {
+    switch (stateNotifier.value) {
+      case PageState.browse:
+        return const Text('Aves');
+      case PageState.search:
+        return SearchField(
+          stateNotifier: stateNotifier,
+          controller: _searchFieldController,
+        );
+    }
+    return null;
+  }
+
+  List<Widget> _buildActions() {
     return [
       Builder(
-        builder: (context) => Consumer<CollectionLens>(
-          builder: (context, collection, child) => IconButton(
-            icon: Icon(OMIcons.search),
-            onPressed: () => showSearch(
-              context: context,
-              delegate: ImageSearchDelegate(collection),
-            ),
-          ),
-        ),
+        builder: (context) {
+          switch (stateNotifier.value) {
+            case PageState.browse:
+              return IconButton(
+                icon: Icon(OMIcons.search),
+                onPressed: () => stateNotifier.value = PageState.search,
+              );
+            case PageState.search:
+              return IconButton(
+                icon: Icon(OMIcons.clear),
+                onPressed: () => _searchFieldController.clear(),
+              );
+          }
+          return null;
+        },
       ),
       Builder(
         builder: (context) => Consumer<CollectionLens>(
@@ -68,19 +171,19 @@ class AllCollectionAppBar extends SliverAppBar {
                 child: MenuRow(text: 'Stats', icon: OMIcons.pieChart),
               ),
             ],
-            onSelected: (action) => _onActionSelected(context, collection, action),
+            onSelected: (action) => _onActionSelected(collection, action),
           ),
         ),
       ),
     ];
   }
 
-  static void _onActionSelected(BuildContext context, CollectionLens collection, CollectionAction action) async {
+  void _onActionSelected(CollectionLens collection, CollectionAction action) async {
     // wait for the popup menu to hide before proceeding with the action
     await Future.delayed(const Duration(milliseconds: 300));
     switch (action) {
       case CollectionAction.stats:
-        unawaited(_goToStats(context, collection));
+        unawaited(_goToStats(collection));
         break;
       case CollectionAction.groupByAlbum:
         settings.collectionGroupFactor = GroupFactor.album;
@@ -109,7 +212,7 @@ class AllCollectionAppBar extends SliverAppBar {
     }
   }
 
-  static Future _goToStats(BuildContext context, CollectionLens collection) {
+  Future<void> _goToStats(CollectionLens collection) {
     return Navigator.push(
       context,
       MaterialPageRoute(
@@ -119,6 +222,45 @@ class AllCollectionAppBar extends SliverAppBar {
       ),
     );
   }
+
+  void _onStateChange() {
+    if (stateNotifier.value == PageState.search) {
+      _browseToSearchAnimation.forward();
+    } else {
+      _browseToSearchAnimation.reverse();
+      _searchFieldController.clear();
+    }
+  }
+}
+
+class SearchField extends StatelessWidget {
+  final ValueNotifier<PageState> stateNotifier;
+  final TextEditingController controller;
+
+  const SearchField({
+    @required this.stateNotifier,
+    @required this.controller,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final collection = Provider.of<CollectionLens>(context);
+    return TextField(
+      controller: controller,
+      decoration: const InputDecoration(
+        hintText: 'Search...',
+        border: InputBorder.none,
+      ),
+      autofocus: true,
+      onSubmitted: (query) {
+        query = query.trim();
+        if (query.isNotEmpty) {
+          collection.addFilter(QueryFilter(query));
+        }
+        stateNotifier.value = PageState.browse;
+      },
+    );
+  }
 }
 
 enum CollectionAction { stats, groupByAlbum, groupByMonth, groupByDay, sortByDate, sortBySize, sortByName }

lib/widgets/album/collection_page.dart

@@ -3,6 +3,7 @@ import 'package:aves/widgets/album/collection_app_bar.dart';
 import 'package:aves/widgets/album/collection_drawer.dart';
 import 'package:aves/widgets/album/thumbnail_collection.dart';
 import 'package:aves/widgets/common/data_providers/media_query_data_provider.dart';
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 
@@ -13,13 +14,12 @@ class CollectionPage extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    debugPrint('$runtimeType build');
     return MediaQueryDataProvider(
       child: ChangeNotifierProvider<CollectionLens>.value(
         value: collection,
         child: Scaffold(
-          body: ThumbnailCollection(
-            appBar: AllCollectionAppBar(),
-          ),
+          body: CollectionPageBody(),
           drawer: CollectionDrawer(
             source: collection.source,
           ),
@@ -29,3 +29,27 @@ class CollectionPage extends StatelessWidget {
     );
   }
 }
+
+class CollectionPageBody extends StatelessWidget {
+  final ValueNotifier<PageState> _stateNotifier = ValueNotifier(PageState.browse);
+
+  @override
+  Widget build(BuildContext context) {
+    return WillPopScope(
+      onWillPop: () {
+        if (_stateNotifier.value == PageState.search) {
+          _stateNotifier.value = PageState.browse;
+          return SynchronousFuture(false);
+        }
+        return SynchronousFuture(true);
+      },
+      child: ThumbnailCollection(
+        appBar: CollectionAppBar(
+          stateNotifier: _stateNotifier,
+        ),
+      ),
+    );
+  }
+}
+
+enum PageState { browse, search }

lib/widgets/album/filter_bar.dart

@@ -6,12 +6,13 @@ import 'package:provider/provider.dart';
 class FilterBar extends StatelessWidget implements PreferredSizeWidget {
   static const EdgeInsets padding = EdgeInsets.symmetric(horizontal: 8);
 
+  static final double preferredHeight = kMinInteractiveDimension + padding.vertical;
+
   @override
-  final Size preferredSize = Size.fromHeight(kMinInteractiveDimension + padding.vertical);
+  final Size preferredSize = Size.fromHeight(preferredHeight);
 
   @override
   Widget build(BuildContext context) {
-    debugPrint('$runtimeType build');
     final collection = Provider.of<CollectionLens>(context);
     final filters = collection.filters.toList()..sort();
 

lib/widgets/album/thumbnail_collection.dart

@@ -21,6 +21,7 @@ class ThumbnailCollection extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    debugPrint('$runtimeType build');
     final collection = Provider.of<CollectionLens>(context);
     final sections = collection.sections;
     final sectionKeys = sections.keys.toList();
@@ -45,6 +46,7 @@ class ThumbnailCollection extends StatelessWidget {
             child: ValueListenableBuilder(
               valueListenable: _columnCountNotifier,
               builder: (context, columnCount, child) {
+                debugPrint('$runtimeType builder columnCount=$columnCount');
                 final scrollView = CustomScrollView(
                   key: _scrollableKey,
                   primary: true,