flutter_app_android/lib/presentation/navigation/route_guards.dart

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import '../screens/auth/login_screen.dart';
import '../providers/auth_provider.dart';

class ProtectedRoute extends StatelessWidget {
  final Widget child;
  final String? routeName;
  
  const ProtectedRoute({
    super.key,
    required this.child,
    this.routeName,
  });
  
  @override
  Widget build(BuildContext context) {
    final authProvider = Provider.of<AuthProvider>(context);
    
    if (authProvider.isAuthenticated) {
      return child;
    } else {
      return LoginScreen(
        onSuccess: () {
          // 如果有routeName，可以使用pushReplacementNamed
          if (routeName != null) {
            Navigator.of(context).pushReplacementNamed(routeName!);
          } else {
            // 否则使用原来的方式
            Navigator.of(context).pushReplacement(
              MaterialPageRoute(builder: (_) => child),
            );
          }
        },
      );
    }
  }
}