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packages/flutter_mozilla_components/lib/src/domain/services/gecko_event.dart

@@ -19,6 +19,7 @@ typedef IconUpdateEvent = ({String url, Uint8List bytes});
 typedef ThumbnailEvent = ({String tabId, Uint8List? bytes});
 typedef FindResultsEvent = ({String tabId, List<FindResultState> results});
 typedef LongPressEvent = ({String tabId, HitResult hitResult});
+typedef ScrollEvent = ({String tabId, int scrollY});
 
 class GeckoEventService extends GeckoStateEvents {
   // Stream controllers
@@ -37,6 +38,7 @@ class GeckoEventService extends GeckoStateEvents {
   final _thumbnailSubject = PublishSubject<ThumbnailEvent>();
   final _findResultsSubject = PublishSubject<FindResultsEvent>();
   final _longPressSubject = PublishSubject<LongPressEvent>();
+  final _scrollEventSubject = PublishSubject<ScrollEvent>();
 
   final _tabAddedSubject = PublishSubject<String>();
 
@@ -56,6 +58,7 @@ class GeckoEventService extends GeckoStateEvents {
   Stream<ThumbnailEvent> get thumbnailEvents => _thumbnailSubject.stream;
   Stream<FindResultsEvent> get findResultsEvent => _findResultsSubject.stream;
   Stream<LongPressEvent> get longPressEvent => _longPressSubject.stream;
+  Stream<ScrollEvent> get scrollEvent => _scrollEventSubject.stream;
 
   Stream<String> get tabAddedStream => _tabAddedSubject.stream;
 
@@ -166,6 +169,14 @@ class GeckoEventService extends GeckoStateEvents {
     _tabAddedSubject.addWhenMoreRecent(timestamp, null, tabId);
   }
 
+  @override
+  void onScrollChange(int timestamp, String tabId, int scrollY) {
+    _scrollEventSubject.addWhenMoreRecent(timestamp, tabId, (
+      tabId: tabId,
+      scrollY: scrollY,
+    ));
+  }
+
   GeckoEventService.setUp({
     BinaryMessenger? binaryMessenger,
     String messageChannelSuffix = '',
@@ -188,6 +199,7 @@ class GeckoEventService extends GeckoStateEvents {
     unawaited(_thumbnailSubject.close());
     unawaited(_findResultsSubject.close());
     unawaited(_longPressSubject.close());
+    unawaited(_scrollEventSubject.close());
     unawaited(_tabAddedSubject.close());
   }
 }

packages/flutter_mozilla_components/lib/src/pigeons/gecko.g.dart

@@ -4338,6 +4338,8 @@ abstract class GeckoStateEvents {
 
   void onLongPress(int timestamp, String id, HitResult hitResult);
 
+  void onScrollChange(int timestamp, String tabId, int scrollY);
+
   static void setUp(GeckoStateEvents? api, {BinaryMessenger? binaryMessenger, String messageChannelSuffix = '',}) {
     messageChannelSuffix = messageChannelSuffix.isNotEmpty ? '.$messageChannelSuffix' : '';
     {
@@ -4750,6 +4752,37 @@ abstract class GeckoStateEvents {
         });
       }
     }
+    {
+      final BasicMessageChannel<Object?> pigeonVar_channel = BasicMessageChannel<Object?>(
+          'dev.flutter.pigeon.flutter_mozilla_components.GeckoStateEvents.onScrollChange$messageChannelSuffix', pigeonChannelCodec,
+          binaryMessenger: binaryMessenger);
+      if (api == null) {
+        pigeonVar_channel.setMessageHandler(null);
+      } else {
+        pigeonVar_channel.setMessageHandler((Object? message) async {
+          assert(message != null,
+          'Argument for dev.flutter.pigeon.flutter_mozilla_components.GeckoStateEvents.onScrollChange was null.');
+          final List<Object?> args = (message as List<Object?>?)!;
+          final int? arg_timestamp = (args[0] as int?);
+          assert(arg_timestamp != null,
+              'Argument for dev.flutter.pigeon.flutter_mozilla_components.GeckoStateEvents.onScrollChange was null, expected non-null int.');
+          final String? arg_tabId = (args[1] as String?);
+          assert(arg_tabId != null,
+              'Argument for dev.flutter.pigeon.flutter_mozilla_components.GeckoStateEvents.onScrollChange was null, expected non-null String.');
+          final int? arg_scrollY = (args[2] as int?);
+          assert(arg_scrollY != null,
+              'Argument for dev.flutter.pigeon.flutter_mozilla_components.GeckoStateEvents.onScrollChange was null, expected non-null int.');
+          try {
+            api.onScrollChange(arg_timestamp!, arg_tabId!, arg_scrollY!);
+            return wrapResponse(empty: true);
+          } on PlatformException catch (e) {
+            return wrapResponse(error: e);
+          }          catch (e) {
+            return wrapResponse(error: PlatformException(code: 'error', message: e.toString()));
+          }
+        });
+      }
+    }
   }
 }