在Flutter web中截图

dependencies:
  flutter_html: ^2.1.2

import 'package:flutter_html/flutter_html.dart';

GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey<ScaffoldState>();

@override
Widget build(BuildContext context) {
  return Scaffold(
    key: _scaffoldKey,
    body: Html(
      key: _scaffoldKey,
      data: '<div>需要截图的内容</div>',
    ),
  );
}

Future<Uint8List> captureScreenshot() async {
  RenderRepaintBoundary boundary = _scaffoldKey.currentContext.findRenderObject();
  ui.Image image = await boundary.toImage(pixelRatio: 3.0);
  ByteData byteData = await image.toByteData(format: ui.ImageByteFormat.png);
  return byteData.buffer.asUint8List();
}

Uint8List screenshot = await captureScreenshot();
// 处理截图结果，例如保存为文件或展示在页面上