1. Import

lib/content_views/utils/content_view_widget.dart

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+import 'package:flutter/cupertino.dart';
+
+import 'header_info.dart';
+
+abstract class ContentViewWidget extends StatefulWidget {
+  const ContentViewWidget({super.key});
+
+  Future<HeaderInfo> getHeaderInfo(BuildContext context);
+
+  void close() {
+    close();
+  }
+}

lib/content_views/utils/header_info.dart

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+import 'package:flutter/material.dart';
+
+class HeaderInfo {
+  late Widget titleWidget;
+  late bool rightButtonEnabled;
+  late bool rightButtonVisible;
+  late Future<Widget?>? rightButtonImage;
+  late Function rightButtonOnPressed;
+
+  HeaderInfo({required this.titleWidget, required this.rightButtonEnabled, required this.rightButtonVisible, this.rightButtonImage, required this.rightButtonOnPressed});
+}

lib/content_views/utils/widget_stack.dart

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+class WidgetStack<E> {
+  final _list = <E>[];
+
+  void push(E value) => _list.add(value);
+
+  E pop() => _list.removeLast();
+
+  E get peek => _list.last;
+
+  bool get isEmpty => _list.isEmpty;
+  bool get isNotEmpty => _list.isNotEmpty;
+
+  void clear() => _list.clear();
+
+  @override
+  String toString() => _list.toString();
+}