BufferedKeys class abstract

A minimal buffer interface for synchronously reading the state of keys.

When reading directly from the terminal using dart:io, you can either:

1. Block the program until a key is pressed (stdin.readByteSync()).
2. Capture event codes as they are received (stdin.listen()).

BufferedKeys provides a synchronous API for the state of key codes:

import 'dart:io' as io;

void main() async {
  const frames = Duration(milliseconds: 1000 ~/ 60);
  const qKey = 0x51;
  final bufferedKeys = BufferedKeys.fromStream(io.stdin);

  io.stdout.writeln('Press Q to exit.');
  await for (final _ in Stream.periodic(frames)) {
    if (bufferedKeys.isPressed(qKey)) {
      break;
    }
    bufferedKeys.clear();
  }

  await bufferedKeys.close();
}