drawer: navigate by country

lib/model/collection_filters.dart

@@ -24,6 +24,15 @@ class TagFilter extends CollectionFilter {
   bool filter(ImageEntry entry) => entry.xmpSubjects.contains(tag);
 }
 
+class CountryFilter extends CollectionFilter {
+  final String country;
+
+  const CountryFilter(this.country);
+
+  @override
+  bool filter(ImageEntry entry) => entry.isLocated && entry.addressDetails.countryName == country;
+}
+
 class VideoFilter extends CollectionFilter {
   @override
   bool filter(ImageEntry entry) => entry.isVideo;

lib/model/collection_lens.dart

@@ -28,7 +28,7 @@ class CollectionLens with ChangeNotifier {
         this.sortFactor = sortFactor ?? SortFactor.date {
     _subscriptions.add(source.eventBus.on<EntryAddedEvent>().listen((e) => onEntryAdded()));
     _subscriptions.add(source.eventBus.on<EntryRemovedEvent>().listen((e) => onEntryRemoved(e.entry)));
-    _subscriptions.add(source.eventBus.on<MetadataChangedEvent>().listen((e) => onMetadataChanged()));
+    _subscriptions.add(source.eventBus.on<CatalogMetadataChangedEvent>().listen((e) => onMetadataChanged()));
     onEntryAdded();
   }
 

lib/model/collection_source.dart

@@ -12,6 +12,7 @@ class CollectionSource {
 
   List<String> sortedAlbums = List.unmodifiable(const Iterable.empty());
   List<String> sortedTags = List.unmodifiable(const Iterable.empty());
+  List<String> sortedCountries = List.unmodifiable(const Iterable.empty());
 
   List<ImageEntry> get entries => List.unmodifiable(_rawEntries);
 
@@ -35,7 +36,7 @@ class CollectionSource {
       }
     });
     debugPrint('$runtimeType loadCatalogMetadata complete in ${stopwatch.elapsed.inMilliseconds}ms with ${saved.length} saved entries');
-    onMetadataChanged();
+    onCatalogMetadataChanged();
   }
 
   Future<void> loadAddresses() async {
@@ -48,6 +49,7 @@ class CollectionSource {
       }
     });
     debugPrint('$runtimeType loadAddresses complete in ${stopwatch.elapsed.inMilliseconds}ms with ${saved.length} saved entries');
+    onAddressMetadataChanged();
   }
 
   Future<void> catalogEntries() async {
@@ -65,15 +67,10 @@ class CollectionSource {
     if (newMetadata.isEmpty) return;
 
     await metadataDb.saveMetadata(List.unmodifiable(newMetadata));
-    onMetadataChanged();
+    onCatalogMetadataChanged();
     debugPrint('$runtimeType catalogEntries complete in ${stopwatch.elapsed.inSeconds}s with ${newMetadata.length} new entries');
   }
 
-  void onMetadataChanged() {
-    updateTags();
-    eventBus.fire(MetadataChangedEvent());
-  }
-
   Future<void> locateEntries() async {
     final stopwatch = Stopwatch()..start();
     final unlocatedEntries = _rawEntries.where((entry) => entry.hasGps && !entry.isLocated).toList();
@@ -89,9 +86,20 @@ class CollectionSource {
       }
     });
     await metadataDb.saveAddresses(List.unmodifiable(newAddresses));
+    onAddressMetadataChanged();
     debugPrint('$runtimeType locateEntries complete in ${stopwatch.elapsed.inMilliseconds}ms');
   }
 
+  void onCatalogMetadataChanged() {
+    updateTags();
+    eventBus.fire(CatalogMetadataChangedEvent());
+  }
+
+  void onAddressMetadataChanged() {
+    updateLocations();
+    eventBus.fire(AddressMetadataChangedEvent());
+  }
+
   void updateAlbums() {
     final albums = _rawEntries.map((entry) => entry.directory).toSet();
     final sorted = albums.toList()
@@ -104,9 +112,14 @@ class CollectionSource {
   }
 
   void updateTags() {
-    final tags = _rawEntries.expand((entry) => entry.xmpSubjects).toSet();
-    final sorted = tags.toList()..sort(compareAsciiUpperCase);
-    sortedTags = List.unmodifiable(sorted);
+    final tags = _rawEntries.expand((entry) => entry.xmpSubjects).toSet().toList()..sort(compareAsciiUpperCase);
+    sortedTags = List.unmodifiable(tags);
+  }
+
+  void updateLocations() {
+    final locatedEntries = _rawEntries.where((entry) => entry.isLocated);
+    final countries = locatedEntries.map((entry) => entry.addressDetails.countryName).toSet().toList()..sort(compareAsciiUpperCase);
+    sortedCountries = List.unmodifiable(countries);
   }
 
   void add(ImageEntry entry) {
@@ -140,7 +153,9 @@ class CollectionSource {
   }
 }
 
-class MetadataChangedEvent {}
+class AddressMetadataChangedEvent {}
+
+class CatalogMetadataChangedEvent {}
 
 class EntryAddedEvent {
   final ImageEntry entry;

lib/widgets/album/all_collection_drawer.dart

@@ -20,7 +20,7 @@ class AllCollectionDrawer extends StatefulWidget {
 }
 
 class _AllCollectionDrawerState extends State<AllCollectionDrawer> {
-  bool _albumsExpanded = false, _tagsExpanded = false;
+  bool _albumsExpanded = false, _tagsExpanded = false, _countriesExpanded = false;
 
   @override
   Widget build(BuildContext context) {
@@ -113,6 +113,16 @@ class _AllCollectionDrawerState extends State<AllCollectionDrawer> {
           dense: true,
           filter: TagFilter(tag),
         );
+    final buildCountryEntry = (country) => _FilteredCollectionNavTile(
+          collection: collection,
+          leading: Icon(
+            OMIcons.place,
+            color: stringToColor(country),
+          ),
+          title: country,
+          dense: true,
+          filter: CountryFilter(country),
+        );
 
     final regularAlbums = [], appAlbums = [], specialAlbums = [];
     for (var album in source.sortedAlbums) {
@@ -130,6 +140,7 @@ class _AllCollectionDrawerState extends State<AllCollectionDrawer> {
     }
 
     final tags = source.sortedTags;
+    final countries = source.sortedCountries;
     final drawerItems = [
       header,
       gifEntry,
@@ -186,6 +197,28 @@ class _AllCollectionDrawerState extends State<AllCollectionDrawer> {
             children: tags.map(buildTagEntry).toList(),
           ),
         ),
+      if (countries.isNotEmpty)
+        SafeArea(
+          top: false,
+          bottom: false,
+          child: ExpansionTile(
+            leading: const Icon(OMIcons.place),
+            title: Row(
+              children: [
+                const Text('Countries'),
+                const Spacer(),
+                Text(
+                  '${countries.length}',
+                  style: TextStyle(
+                    color: (_countriesExpanded ? Theme.of(context).accentColor : Colors.white).withOpacity(.6),
+                  ),
+                ),
+              ],
+            ),
+            onExpansionChanged: (expanded) => setState(() => _countriesExpanded = expanded),
+            children: countries.map(buildCountryEntry).toList(),
+          ),
+        ),
     ];
 
     return Drawer(