// Copyright 2021 The Flutter team. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'entry_widget.dart';

void main() => runApp(const MyApp(color: Colors.blue));

@pragma('vm:entry-point')
void topMain() => runApp(const MyApp(color: Colors.green));

@pragma('vm:entry-point')
void bottomMain() => runApp(const MyApp(color: Colors.purple));

class MyApp extends StatelessWidget {
  const MyApp({Key? key, required this.color}) : super(key: key);

  final MaterialColor color;

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: color,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);
  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  int? _counter = 0;
  late MethodChannel _channel;

  @override
  void initState() {
    super.initState();
    _channel = const MethodChannel('multiple-flutters');
    _channel.setMethodCallHandler((call) async {
      if (call.method == "setCount") {
        // A notification that the host platform's data model has been updated.
        setState(() {
          _counter = call.arguments as int?;
        });
      } else {
        throw Exception('not implemented ${call.method}');
      }
    });
  }

  void _incrementCounter() {
    // Mutations to the data model are forwarded to the host platform.
    _channel.invokeMethod<void>("incrementCount", _counter);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: SingleChildScrollView(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              const MyEntryWiget(),
              const Text(
                'You have pushed the button this many times:',
              ),
              Text(
                '$_counter',
                style: Theme.of(context).textTheme.headline4,
              ),
              TextButton(
                onPressed: _incrementCounter,
                child: const Text('Add'),
              ),
              TextButton(
                onPressed: () {
                  _channel.invokeMethod<void>("next", _counter);
                },
                child: const Text('Next'),
              ),
            ],
          ),
        ),
      ),
    );
  }
}

import 'dart:typed_data';
import 'dart:ui';

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

class MyEntryWiget extends StatefulWidget {
  const MyEntryWiget({Key? key}) : super(key: key);

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

class _MyEntryWigetState extends State<MyEntryWiget> {
  late GlobalKey _globalKey;
  Uint8List? screenshot;
  @override
  void initState() {
    super.initState();
    _globalKey = GlobalKey();
  }

  @override
  Widget build(BuildContext context) {
    return RepaintBoundary(
        key: _globalKey,
        child: Column(
          children: [
            Container(
                width: 120,
                height: 120,
                child: Image.network(
                    "https://avatars.githubusercontent.com/u/30870216?v=4")),
            TextButton(
              onPressed: () async {
                screenshot = await captureImage(_globalKey);
                if (screenshot != null) setState(() {});
              },
              child: Text(
                "screen shot",
                style: TextStyle(color: Colors.red),
              ),
            ),
            if (screenshot != null) Image.memory(screenshot!),
          ],
        ));
    ;
  }

  /// pass return  data to any platform to show
  Future<Uint8List?> captureImage(GlobalKey rootKey) async {
    try {
      RenderRepaintBoundary boundary =
          rootKey.currentContext!.findRenderObject() as RenderRepaintBoundary;
      var image = await boundary.toImage(pixelRatio: 3.0);
      ByteData? byteData = await image.toByteData(format: ImageByteFormat.png);
      Uint8List? pngBytes = byteData?.buffer.asUint8List();
      return pngBytes;
    } catch (e) {
      print(e);
    }
    return null;
  }
}

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