1-) FLUTTER - içerden dışarıya veya dışardan içeriye metot tetikleme vs

main.dart

body: DisaVeriAktarmaPage(
  onDisaVeriAktar: (String deger) {
    print("buradayim " + deger);
  },
),

DisaVeriAktarmaPage.dart

import 'package:flutter/material.dart';

class DisaVeriAktarmaPage extends StatefulWidget {
  final Function onDisaVeriAktar;

  DisaVeriAktarmaPage({required this.onDisaVeriAktar, Key? key})
      : super(key: key);

  @override
  DisaVeriAktarmaPageState createState() => DisaVeriAktarmaPageState();
}

class DisaVeriAktarmaPageState extends State<DisaVeriAktarmaPage> {
  @override
  Widget build(BuildContext context) {
    return Container(
      child: ElevatedButton(
        child: Text("Veri Gönder"),
        onPressed: () {
          print("merhaba");
          widget.onDisaVeriAktar("rambo");
        },
      ),
    );
  }
}