diff --git a/lib/src/utils/matrix_gesture_detector.dart b/lib/src/utils/matrix_gesture_detector.dart
index d8495d7..f75969a 100644
--- a/lib/src/utils/matrix_gesture_detector.dart
+++ b/lib/src/utils/matrix_gesture_detector.dart
@@ -123,15 +123,15 @@ class MatrixGestureDetectorState extends State<MatrixGestureDetector> {
     );
   }
 
-  _ValueUpdater<Offset> translationUpdater = _ValueUpdater(
+  ValueUpdater<Offset> translationUpdater = ValueUpdater(
     value: Offset.zero,
     onUpdate: (oldVal, newVal) => newVal - oldVal,
   );
-  _ValueUpdater<double> scaleUpdater = _ValueUpdater(
+  ValueUpdater<double> scaleUpdater = ValueUpdater(
     value: 1.0,
     onUpdate: (oldVal, newVal) => newVal / oldVal,
   );
-  _ValueUpdater<double> rotationUpdater = _ValueUpdater(
+  ValueUpdater<double> rotationUpdater = ValueUpdater(
     value: 0.0,
     onUpdate: (oldVal, newVal) => newVal - oldVal,
   );
@@ -221,13 +221,13 @@ class MatrixGestureDetectorState extends State<MatrixGestureDetector> {
   }
 }
 
-typedef _OnUpdate<T> = T Function(T oldValue, T newValue);
+typedef OnUpdate<T> = T Function(T oldValue, T newValue);
 
-class _ValueUpdater<T> {
-  final _OnUpdate<T> onUpdate;
+class ValueUpdater<T> {
+  final OnUpdate<T> onUpdate;
   T value;
 
-  _ValueUpdater({
+  ValueUpdater({
     required this.value,
     required this.onUpdate,
   });
diff --git a/lib/src/views/main_control_views/filters_view.dart b/lib/src/views/main_control_views/filters_view.dart
index 566a8e4..dc4aad3 100644
--- a/lib/src/views/main_control_views/filters_view.dart
+++ b/lib/src/views/main_control_views/filters_view.dart
@@ -7,12 +7,12 @@ import 'package:flutter_story_editor/src/theme/style.dart';
 
 class FiltersView extends StatefulWidget {
 
-  List<List<double>> selectedFilters = [];
+  final List<List<double>> selectedFilters;
   final List<File>? selectedFiles;
   final int currentPageIndex;
   final Function(List<double>) onFilterChange;
 
-  FiltersView({super.key,  this.selectedFilters = const [], this.selectedFiles, required this.currentPageIndex, required this.onFilterChange});
+  const FiltersView({super.key,  required this.selectedFilters, this.selectedFiles, required this.currentPageIndex, required this.onFilterChange});
 
   @override
   State<FiltersView> createState() => _FiltersViewState();