statefulwidgetlifecycle.dart

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      home: Main(),
    );
  }
}

class Main extends StatefulWidget {
  const Main({super.key});

  @override
  State<Main> createState() => _MainState();
}

class _MainState extends State<Main> {
  int number = 0;
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Lifecycle application'),
        actions: [
          ElevatedButton(
              onPressed: () {
                setState(() {
                  number ++;
                });
              }, child: const Text('Change Parent Widget Data'))
        ],
      ),
      body: Center(
        child: ElevatedButton(
          child: Text('Go to home screen'),
          onPressed: (){
            Navigator.push(context, MaterialPageRoute(builder: (_)=> Home(number: number)));
          },
        ),
      ),
    );
  }
}



class Home extends StatefulWidget {
   const Home({super.key, required this.number});
  final int number;

  @override
  State<Home> createState() => _HomeState();
}

class _HomeState extends State<Home> {
  int number = 0;
  final TextEditingController _textEditingController = TextEditingController();
  @override
  void initState() {
    super.initState();
    debugPrint('init state is called');
  }
  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    debugPrint('did change dependency is called');
  }
  @override
  Widget build(BuildContext context) {
    debugPrint('build method is called');
    return Scaffold(
      body: Column(
      mainAxisAlignment: MainAxisAlignment.center,
      children: [
        Text('Data from parent ${widget.number}'),
        const Divider(),
        Text('Data from This widget $number'),
        const Divider(),
        ElevatedButton(onPressed: (){
          setState(() {
            number ++;
          });
        }, child: const Text('Change Data')),
         TextField(
          controller: _textEditingController,
        ),
      ],
    ),
    );
  }
  @override
  void didUpdateWidget(covariant Home oldWidget) {
    super.didUpdateWidget(oldWidget);
    debugPrint('did update widget is called');
    debugPrint('old data is ${oldWidget.number} new data is ${widget.number}');
  }

  @override
  void dispose() {
    super.dispose();
    debugPrint('dispose widget is called');
  }

}