_getPositionInfo() {
    const {value, getAlignStyle} = this.props;

    const x = getAttributeFunctor(this.props, 'x')(value);
    const y = getAttributeFunctor(this.props, 'y')(value);

    const align = this._getAlign(x, y);

    return {
      position: getAlignStyle
        ? getAlignStyle(align, x, y)
        : this._getAlignStyle(align, x, y),
      positionClassName: this._getAlignClassNames(align)
    };
  }
Get the position for the hint and the appropriate class name.
@returns {{style: Object, positionClassName: string}} Style and className for the
hint.
@private