hide toolbar on scrool

packages/flutter_mozilla_components/android/src/main/kotlin/eu/weblibre/flutter_mozilla_components/middleware/FlutterEventMiddleware.kt

@@ -133,6 +133,15 @@ class FlutterEventMiddleware(private val flutterEvents: GeckoStateEvents) : Midd
                     ) { _ -> }
                 }
             }
+            is ReaderAction.UpdateReaderScrollYAction -> {
+                runOnUiThread {
+                    flutterEvents.onScrollChange(
+                        System.currentTimeMillis(),
+                        action.tabId,
+                        action.scrollY.toLong()
+                    ) { _ -> }
+                }
+            }
             else -> {
                 //logger.debug("Event fired: " + action.javaClass.name)
             }

packages/flutter_mozilla_components/android/src/main/kotlin/eu/weblibre/flutter_mozilla_components/pigeons/Gecko.g.kt

@@ -3998,6 +3998,23 @@ class GeckoStateEvents(private val binaryMessenger: BinaryMessenger, private val
       } 
     }
   }
+  fun onScrollChange(timestampArg: Long, tabIdArg: String, scrollYArg: Long, callback: (Result<Unit>) -> Unit)
+{
+    val separatedMessageChannelSuffix = if (messageChannelSuffix.isNotEmpty()) ".$messageChannelSuffix" else ""
+    val channelName = "dev.flutter.pigeon.flutter_mozilla_components.GeckoStateEvents.onScrollChange$separatedMessageChannelSuffix"
+    val channel = BasicMessageChannel<Any?>(binaryMessenger, channelName, codec)
+    channel.send(listOf(timestampArg, tabIdArg, scrollYArg)) {
+      if (it is List<*>) {
+        if (it.size > 1) {
+          callback(Result.failure(FlutterError(it[0] as String, it[1] as String, it[2] as String?)))
+        } else {
+          callback(Result.success(Unit))
+        }
+      } else {
+        callback(Result.failure(GeckoPigeonUtils.createConnectionError(channelName)))
+      } 
+    }
+  }
 }
 /** Generated class from Pigeon that represents Flutter messages that can be called from Kotlin. */
 class GeckoLogging(private val binaryMessenger: BinaryMessenger, private val messageChannelSuffix: String = "") {