call method

@override String? call(TerminalKeyboardEvent event)

Implementation

@override
String? call(TerminalKeyboardEvent event) {
  if (event.type == TerminalKeyEventType.release) {
    return null;
  }
  if (!event.alt || event.ctrl || event.shift) {
    return null;
  }
  if (event.platform == TerminalTargetPlatform.macos) {
    if (!event.state.altSendsEscapeMode) return null;
  } else {
    if (!event.state.altEscPrefixMode) return null;
  }

  final key = event.key;
  if (key.index < TerminalKey.keyA.index ||
      key.index > TerminalKey.keyZ.index) {
    return null;
  }
  final charCode = key.index - TerminalKey.keyA.index + 65;
  return String.fromCharCodes([0x1b, charCode]);
}