import 'dart:async';
import 'dart:ui';

import 'package:flutter/material.dart';
import 'package:flutter/scheduler.dart' show SchedulerBinding, Ticker;

void main() {
  WidgetsFlutterBinding.ensureInitialized();

  // ignore: invalid_use_of_protected_member
  SchedulerBinding.instance.ensureFrameCallbacksRegistered();

  final onBeginFrame = PlatformDispatcher.instance.onBeginFrame;
  final onDrawFrame = PlatformDispatcher.instance.onDrawFrame;

  PlatformDispatcher.instance.onBeginFrame = (Duration elapsed) {
    print('+' * 30);
    final frameNumber = PlatformDispatcher.instance.frameData.frameNumber;
    print('frameNumber from onBeginFrame callback: $frameNumber');
    onBeginFrame!(elapsed);
    print('___finish onBeginFrame');
  };

  PlatformDispatcher.instance.onDrawFrame = () {
    print('___start onDrawFrame');
    onDrawFrame!();
    final frameNumber = PlatformDispatcher.instance.frameData.frameNumber;
    print('frameNumber from onDrawFrame callback: $frameNumber');
    print('-' * 30);
  };

  runApp(const App());
}

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

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

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

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

class _HomeState extends State<Home> with TickerProviderStateMixin {
  Ticker? ticker;

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

    SchedulerBinding.instance.addPersistentFrameCallback((_) {
      final frameNumber = PlatformDispatcher.instance.frameData.frameNumber;
      print('frameNumber from the persistent callback: $frameNumber');
    });

    ticker = createTicker((_) {
      final frameNumber = PlatformDispatcher.instance.frameData.frameNumber;
      print('frameNumber from the transient callback: $frameNumber');
      scheduleMicrotask(() {
        final frameNumber = PlatformDispatcher.instance.frameData.frameNumber;
        print('frameNumber from the microtask callback: $frameNumber');
      });
      SchedulerBinding.instance.addPostFrameCallback((_) {
        final frameNumber = PlatformDispatcher.instance.frameData.frameNumber;
        print('frameNumber from the postframe callback: $frameNumber');
      });
    })..start();

    Timer(const Duration(seconds: 1), () {
      ticker?.dispose();
      ticker = null;
    });
  }

  @override
  void dispose() {
    ticker?.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return const Placeholder();
  }
}