prepare for multiple apps

apps/weblibre/lib/presentation/hooks/sampled_value_notifier.dart

@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 2024-2026 Fabian Freund.
+ *
+ * This file is part of WebLibre
+ * (see https://weblibre.eu).
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+import 'package:flutter/widgets.dart';
+import 'package:flutter_hooks/flutter_hooks.dart';
+import 'package:weblibre/utils/sampled_value_notifier.dart';
+
+/// A custom hook that creates a sampled ValueNotifier from another ValueNotifier
+ValueNotifier<T> useSampledValueNotifier<T>({
+  required ValueNotifier<T> source,
+  required Duration sampleDuration,
+}) {
+  return use(
+    _SampledValueNotifierHook<T>(
+      source: source,
+      sampleDuration: sampleDuration,
+    ),
+  );
+}
+
+/// Hook implementation for sampled ValueNotifier
+class _SampledValueNotifierHook<T> extends Hook<ValueNotifier<T>> {
+  final ValueNotifier<T> source;
+  final Duration sampleDuration;
+
+  const _SampledValueNotifierHook({
+    required this.source,
+    required this.sampleDuration,
+  });
+
+  @override
+  _SampledValueNotifierHookState<T> createState() =>
+      _SampledValueNotifierHookState<T>();
+}
+
+class _SampledValueNotifierHookState<T>
+    extends HookState<ValueNotifier<T>, _SampledValueNotifierHook<T>> {
+  late SampledValueNotifier<T> _sampledNotifier;
+
+  @override
+  void initHook() {
+    super.initHook();
+    _sampledNotifier = SampledValueNotifier<T>(
+      source: hook.source,
+      sampleDuration: hook.sampleDuration,
+    );
+  }
+
+  @override
+  ValueNotifier<T> build(BuildContext context) {
+    return _sampledNotifier;
+  }
+
+  @override
+  void dispose() {
+    _sampledNotifier.dispose();
+    super.dispose();
+  }
+
+  @override
+  String get debugLabel => 'useSampledValueNotifier<$T>';
+}