tweaks

Signed-off-by: dom <githubaccount56556@proton.me>

lib/common/widgets/flutter/pop_scope.dart

@@ -0,0 +1,44 @@
+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+abstract class PopScopeState<T extends StatefulWidget> extends State<T>
+    implements PopEntry<T> {
+  ModalRoute<dynamic>? _route;
+
+  @override
+  void onPopInvoked(bool didPop) {}
+
+  @override
+  late final ValueNotifier<bool> canPopNotifier;
+
+  void initCanPopNotifier() {
+    canPopNotifier = ValueNotifier<bool>(false);
+  }
+
+  @override
+  void initState() {
+    super.initState();
+    initCanPopNotifier();
+  }
+
+  @override
+  void didChangeDependencies() {
+    super.didChangeDependencies();
+    final ModalRoute<dynamic>? nextRoute = ModalRoute.of(context);
+    if (nextRoute != _route) {
+      _route?.unregisterPopEntry(this);
+      _route = nextRoute;
+      _route?.registerPopEntry(this);
+    }
+  }
+
+  @override
+  void dispose() {
+    _route?.unregisterPopEntry(this);
+    canPopNotifier.dispose();
+    super.dispose();
+  }
+}