ProxyBox

snippet.packages.flutter.lib.src.rendering.proxy_box.3263.

  

// ignore_for_file: directives_ordering
// ignore_for_file: unnecessary_import
// ignore_for_file: unused_import
// ignore_for_file: unused_element
// ignore_for_file: unused_local_variable
import 'dart:async';
import 'dart:convert';
import 'dart:math' as math;
import 'dart:typed_data';
import 'dart:ui' as ui;
import 'package:flutter_test/flutter_test.dart';
import 'package:flutter/material.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/widgets.dart';
import 'package:flutter/gestures.dart';
import 'package:flutter/painting.dart';
import 'package:flutter/physics.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/semantics.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/scheduler.dart';
import 'package:flutter/animation.dart';
import 'package:flutter/services.dart';

// From: packages/flutter/lib/src/rendering/proxy_box.dart:3263
class PngHome extends StatefulWidget {
  const PngHome({Key? key}) : super(key: key);

  @override
  State createState() => _PngHomeState();
}

class _PngHomeState extends State {
  GlobalKey globalKey = GlobalKey();

  Future _capturePng() async {
    final RenderRepaintBoundary boundary = globalKey.currentContext!.findRenderObject()! as RenderRepaintBoundary;
    final ui.Image image = await boundary.toImage();
    final ByteData? byteData = await image.toByteData(format: ui.ImageByteFormat.png);
    final Uint8List pngBytes = byteData!.buffer.asUint8List();
    print(pngBytes);
  }

  @override
  Widget build(BuildContext context) {
    return RepaintBoundary(
      key: globalKey,
      child: Center(
        child: TextButton(
          onPressed: _capturePng,
          child: const Text('Hello World', textDirection: TextDirection.ltr),
        ),
      ),
    );
  }
}