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

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'EditableText keys test',
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key}) : super(key: key);

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

class _MyHomePageState extends State<MyHomePage> {
  TextEditingController _textController;
  FocusNode _focusNode;

  @override
  void initState() {
    super.initState();
    _textController = TextEditingController(text: 'some\nmulti\nline\ntext\n\njust\na few\nlines\nmore\n...\n...\n');
    _focusNode = FocusNode(
      onKey: (_, RawKeyEvent keyEvent) {
        if (keyEvent is! RawKeyDownEvent) return false;
        final Set<LogicalKeyboardKey> keysPressed = LogicalKeyboardKey.collapseSynonyms(RawKeyboard.instance.keysPressed);
        print('FocusNode onKey RawKeyEvent: $keyEvent | keysPressed: $keysPressed');
        return false;
      }
    );
  }

  @override
  void dispose() {
    _focusNode.dispose();
    _textController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('EditableText keys test')),
      body: Container(
        margin: EdgeInsets.all(10.0),
        child: EditableText(
          controller: _textController,
          focusNode: _focusNode,
          maxLines: null,
          autofocus: true,
          style: TextStyle(fontSize: 24.0, color: Colors.black),
          cursorColor: Colors.amber,
          backgroundCursorColor: Colors.grey,
        ),
      ),
    );
  }
}

[+3072 ms] flutter: FocusNode onKey RawKeyEvent: RawKeyDownEvent#a196a(logicalKey: LogicalKeyboardKey#70050(keyId: "0x100070050", keyLabel: "", debugName: "Arrow
Left"), physicalKey: PhysicalKeyboardKey#70050(usbHidUsage: "0x00070050", debugName: "Arrow Left")) | keysPressed: {LogicalKeyboardKey#70050(keyId: "0x100070050",
keyLabel: "", debugName: "Arrow Left")}

[+4243 ms] flutter: FocusNode onKey RawKeyEvent: RawKeyDownEvent#54d29(logicalKey: LogicalKeyboardKey#70050(keyId: "0x100070050", keyLabel: "", debugName: "Arrow
Left"), physicalKey: PhysicalKeyboardKey#70050(usbHidUsage: "0x00070050", debugName: "Arrow Left")) | keysPressed: {LogicalKeyboardKey#70004(keyId: "0x100070004",
keyLabel: "Key A", debugName: "Key A"), LogicalKeyboardKey#70050(keyId: "0x100070050", keyLabel: "", debugName: "Arrow Left")}