add onSelection callback

lib/models/emoji.dart

@@ -7,12 +7,19 @@ part "emoji.g.dart";
 @Freezed(toJson: false, fromJson: false)
 @JsonSerializable(createToJson: false)
 class Emoji({
-  @JsonKey(fromJson: Emoji.widgetFromJson, name: "emoji")
+  @JsonKey(
+    fromJson: Emoji.widgetFromJson,
+    readValue: Emoji.readWidgetValueFromJson,
+  )
   required final Widget widget,
+  @JsonKey(name: "emoji") required final String value,
   required final IList<String> aliases,
   required final String description,
   required final IList<String> tags,
 }) with _$Emoji {
   static Widget widgetFromJson(String emoji) => Text(emoji);
+
+  static String readWidgetValueFromJson(Map<dynamic, dynamic> json, _) =>
+      json["emoji"];
   factory Emoji.fromJson(Map<String, Object?> json) => _$EmojiFromJson(json);
 }

lib/widgets/emoji_picker.dart

@@ -1,3 +1,5 @@
+import "dart:async";
+
 import "package:collection/collection.dart";
 import "package:fast_immutable_collections/fast_immutable_collections.dart";
 import "package:flutter_hooks/flutter_hooks.dart";
@@ -11,14 +13,19 @@ import "package:super_sliver_list/super_sliver_list.dart";
 
 final class const EmojiPicker({
   final IList<EmojiCategory> extraCategories = const IList.empty(),
+  required final FutureOr<void> Function(String value) onSelection,
   super.key,
 }) extends HookConsumerWidget {
   @override
   Widget build(BuildContext context, WidgetRef ref) {
     final selectedCategory = useState<int?>(null);
+
     final scrollController = useScrollController();
     final listController = useMemoized(ListController.new);
 
+    final categoryScrollController = useScrollController();
+    final categoryListController = useMemoized(ListController.new);
+
     useEffect(() {
       void onChange() {
         final range = listController.visibleRange;
@@ -27,6 +34,13 @@ final class const EmojiPicker({
           if (selectedCategory.value != firstVisible) {
             WidgetsBinding.instance.addPostFrameCallback((_) {
               selectedCategory.value = firstVisible;
+              categoryListController.animateToItem(
+                index: firstVisible,
+                scrollController: categoryScrollController,
+                alignment: 0,
+                duration: (_) => Duration(milliseconds: 300),
+                curve: (_) => Curves.easeInOut,
+              );
             });
           }
         }
@@ -43,7 +57,9 @@ final class const EmojiPicker({
           .watch(EmojiController.provider)
           .betterWhen(
             data: (categories) {
-              final combined = categories.addAll(extraCategories);
+              final combined = useMemoized(
+                () => categories.addAll(extraCategories),
+              );
 
               return Column(
                 spacing: 4,
@@ -56,8 +72,10 @@ final class const EmojiPicker({
                   ),
                   SizedBox(
                     height: 48,
-                    child: ListView(
+                    child: SuperListView(
                       scrollDirection: .horizontal,
+                      controller: categoryScrollController,
+                      listController: categoryListController,
                       children: combined
                           .mapIndexed(
                             (index, category) => Padding(
@@ -97,21 +115,30 @@ final class const EmojiPicker({
                           crossAxisAlignment: CrossAxisAlignment.start,
                           children: [
                             DividerText(category.name),
-                            Wrap(
+                            GridView.builder(
-                              children: category.emojis
+                              gridDelegate:
-                                  .map(
+                                  const SliverGridDelegateWithMaxCrossAxisExtent(
-                                    (emoji) => IconButton(
+                                    maxCrossAxisExtent: 56,
-                                      onPressed: () {},
+                                    mainAxisExtent: 56,
+                                  ),
+                              itemCount: category.emojis.length,
+                              shrinkWrap: true,
+                              physics: NeverScrollableScrollPhysics(),
+                              itemBuilder: (context, index) {
+                                final emoji = category.emojis[index];
+
+                                return IconButton(
+                                  padding: EdgeInsets.zero,
+                                  onPressed: () async {
+                                    Navigator.of(context).pop();
+                                    await onSelection(emoji.value);
+                                  },
                                   icon: SizedBox.square(
                                     dimension: 36,
-                                        child: FittedBox(
+                                    child: FittedBox(child: emoji.widget),
-                                          fit: .contain,
-                                          child: emoji.widget,
                                   ),
-                                      ),
+                                );
-                                    ),
+                              },
-                                  )
-                                  .toList(),
                             ),
                           ],
                         );

lib/widgets/room_chat.dart

@@ -244,7 +244,11 @@ final class const RoomChat({
                         showDragHandle: true,
                         isScrollControlled: true,
                         context: context,
-                        builder: (context) => EmojiPicker(),
+                        builder: (context) => EmojiPicker(
+                          onSelection: (value) => notifier
+                              .sendReaction(value, event)
+                              .onError(showError),
+                        ),
                       );
                     },
                   ),