File includes/types/CMB2_Type_Taxonomy_Select_Hierarchical.php

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<?php
/**
 * CMB taxonomy_select_hierarchical field type
 *
 * @since  2.6.1
 *
 * @category  WordPress_Plugin
 * @package   CMB2
 * @author    CMB2 team
 * @license   GPL-2.0+
 * @link      https://cmb2.io
 */
class CMB2_Type_Taxonomy_Select_Hierarchical extends CMB2_Type_Taxonomy_Select {

    /**
     * Parent term ID when looping hierarchical terms.
     *
     * @since  2.6.1
     *
     * @var integer
     */
    protected $parent = 0;

    /**
     * Child loop depth.
     *
     * @since  2.6.1
     *
     * @var integer
     */
    protected $level = 0;

    public function render() {
        return $this->rendered(
            $this->types->select( array(
                'options' => $this->get_term_options(),
            ), 'taxonomy_select_hierarchical' )
        );
    }

    public function select_option( $args = array() ) {
        if ( $this->level > 0 ) {
            $args['label'] = str_repeat( '&nbsp;&nbsp;&nbsp;&nbsp;', $this->level ) . $args['label'];
        }
        $option = parent::select_option( $args );
        $children = $this->build_children( $this->current_term, $this->saved_term );

        if ( ! empty( $children ) ) {
            $option .= $children;
        }

        return $option;
    }

    /**
     * Build children hierarchy.
     *
     * @since  2.6.1
     *
     * @param  array        $terms Array of child terms.
     * @param  array|string $saved Array of terms set to the object, or single term slug.
     *
     * @return string              Child option output.
     */
    public function child_option_output( $terms, $saved ) {
        $this->level++;
        $output = $this->loop_terms( $terms, $saved );
        $this->level--;

        return $output;
    }

}

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