/// Provides the active bottom-nav tab index for [MainShell].
library;

import 'package:flutter/material.dart';

class ShellTabScope extends InheritedWidget {
  const ShellTabScope({
    super.key,
    required this.index,
    required super.child,
  });

  final int index;

  static int of(BuildContext context) {
    final scope = context.dependOnInheritedWidgetOfExactType<ShellTabScope>();
    assert(scope != null, 'ShellTabScope not found');
    return scope!.index;
  }

  static int? maybeOf(BuildContext context) {
    return context.dependOnInheritedWidgetOfExactType<ShellTabScope>()?.index;
  }

  @override
  bool updateShouldNotify(ShellTabScope oldWidget) => index != oldWidget.index;
}