walker.taxonomy-single-term.php

<?php

if ( ! class_exists( 'Taxonomy_Single_Term_Walker' ) && class_exists( 'Walker' ) ) :

/**
 * Walker to output an unordered list of taxonomy radio <input> elements.
 *
 * @see Walker
 * @see wp_category_checklist()
 * @see wp_terms_checklist()
 * @since 0.1.2
 */
class Taxonomy_Single_Term_Walker extends Walker {
	public $tree_type = 'category';
	public $db_fields = array( 'parent' => 'parent', 'id' => 'term_id' ); //TODO: decouple this

	public function __construct( $hierarchical, $input_element ) {
		$this->hierarchical = $hierarchical;
		$this->input_element = $input_element;
	}

	/**
	 * Starts the list before the elements are added.
	 *
	 * @see Walker:start_lvl()
	 *
	 * @since 0.1.2
	 *
	 * @param string $output Passed by reference. Used to append additional content.
	 * @param int    $depth  Depth of category. Used for tab indentation.
	 * @param array  $args   An array of arguments. @see wp_terms_checklist()
	 */
	public function start_lvl( &$output, $depth = 0, $args = array() ) {
		if ( 'radio' == $this->input_element ) {
			$indent = str_repeat("\t", $depth);
			$output .= "$indent<ul class='children'>\n";
		}
	}

	/**
	 * Ends the list of after the elements are added.
	 *
	 * @see Walker::end_lvl()
	 *
	 * @since 0.1.2
	 *
	 * @param string $output Passed by reference. Used to append additional content.
	 * @param int    $depth  Depth of category. Used for tab indentation.
	 * @param array  $args   An array of arguments. @see wp_terms_checklist()
	 */
	public function end_lvl( &$output, $depth = 0, $args = array() ) {
		if ( 'radio' == $this->input_element ) {
			$indent = str_repeat("\t", $depth);
			$output .= "$indent</ul>\n";
		}
	}

	/**
	 * Start the element output.
	 *
	 * @see Walker::start_el()
	 *
	 * @since 0.1.2
	 *
	 * @param string $output   Passed by reference. Used to append additional content.
	 * @param object $term The current term object.
	 * @param int    $depth    Depth of the term in reference to parents. Default 0.
	 * @param array  $args     An array of arguments. @see wp_terms_checklist()
	 * @param int    $id       ID of the current term.
	 */
	public function start_el( &$output, $term, $depth = 0, $args = array(), $id = 0 ) {

		$taxonomy = empty( $args['taxonomy'] ) ? 'category' : $args['taxonomy'];
		$name = $taxonomy == 'category' ? 'post_category' : 'tax_input['.$taxonomy.']';
		// input name
		$name = $this->hierarchical ? $name .'[]' : $name;
		// input value
		$value = $this->hierarchical ? $term->term_id : $term->slug;

		$selected_cats = empty( $args['selected_cats'] ) ? array() : $args['selected_cats'];
		$in_selected   = in_array( $term->term_id, $selected_cats );

		$args = array(
			'id'            => esc_attr( $taxonomy .'-'. $term->term_id ),
			'name'          => esc_attr( $name ),
			'value'         => esc_attr( $value ),
			'checked'       => checked( $in_selected, true, false ),
			'selected'      => selected( $in_selected, true, false ),
			'disabled'      => disabled( empty( $args['disabled'] ), false, false ),
			'label'         => esc_html( apply_filters('the_category', $term->name ) ),
			'depth'         => $depth,
		);

		$output .= 'radio' == $this->input_element
			? $this->start_el_radio( $args )
			: $this->start_el_select( $args );
	}

	/**
	 * Creates the opening markup for the radio input
	 *
	 * @since  0.2.0
	 *
	 * @param  array  $args Array of arguments for creating the element
	 *
	 * @return string       Opening li element and radio input
	 */
	public function start_el_radio( $args ) {
		return "\n".sprintf(
			'<li id="%s"><label class="selectit"><input value="%s" type="radio" name="%s" id="in-%s" %s %s/>%s</label>',
			$args['id'],
			$args['value'],
			$args['name'],
			$args['id'],
			$args['checked'],
			$args['disabled'],
			$args['label']
		);
	}

	/**
	 * Creates the opening markup for the select input
	 *
	 * @since  0.2.0
	 *
	 * @param  array  $args Array of arguments for creating the element
	 *
	 * @return string       Opening option element and option text
	 */
	public function start_el_select( $args ) {
		$pad = str_repeat('&nbsp;', $args['depth'] * 3);

		return "\n".sprintf(
			'<option %s %s id="%s" value="%s" class="class-single-term">%s',
			$args['selected'],
			$args['disabled'],
			$args['id'],
			$args['value'],
			$pad . $args['label']
		);
	}

	/**
	 * Ends the element output, if needed.
	 *
	 * @see Walker::end_el()
	 *
	 * @since 0.1.2
	 *
	 * @param string $output   Passed by reference. Used to append additional content.
	 * @param object $term The current term object.
	 * @param int    $depth    Depth of the term in reference to parents. Default 0.
	 * @param array  $args     An array of arguments. @see wp_terms_checklist()
	 */
	public function end_el( &$output, $term, $depth = 0, $args = array() ) {
		if ( 'radio' == $this->input_element ) {
			$output .= "</li>\n";
		} else {
			$output .= "</option>\n";
		}
	}

}

endif; // class_exists check