import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/scheduler.dart';

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

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage>
    with SingleTickerProviderStateMixin {
  final _key = GlobalKey();
  late final _ticker = createTicker((elapsed) => _rasterizeSync());

  @override
  void initState() {
    super.initState();

    SchedulerBinding.instance.addPostFrameCallback((_) {
      _ticker.start();
    });
  }

  @override
  void dispose() {
    _ticker.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return RepaintBoundary(
      key: _key,
      child: Scaffold(
        appBar: AppBar(
          backgroundColor: Theme.of(context).colorScheme.inversePrimary,
          title: Text(widget.title),
        ),
        body: const Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              Text(
                'To image sync leak',
              ),
            ],
          ),
        ),
      ),
    );
  }

  void _rasterizeSync() {
    final image =
        (_key.currentContext!.findRenderObject() as RenderRepaintBoundary)
            .toImageSync();
    image.dispose();
  }
}