_valueUpDownForKeyEvent(value, keyCode) {
    const step = this._useDecimal ? 0.1 : 1;

    if (keyCode === keyCodes.ARROW_UP) {
      value += step;
    } else if (keyCode === keyCodes.ARROW_DOWN) {
      value -= step;
    }

    return value;
  }
value up down for input
@param {number} value - original value number
@param {number} keyCode - input event key code
@returns {number} value - changed value
@private