<?php

/**

 * Helper functions for displaying a list of items in an ajaxified HTML table.

 *

 * @package WordPress

 * @subpackage List_Table

 * @since 4.7.0

 */

/**

 * Helper class to be used only by back compat functions.

 *

 * @since 3.1.0

 */

class _WP_List_Table_Compat extends WP_List_Table {

	public $_screen;

	public $_columns;

	/**

	 * Constructor.

	 *

	 * @since 3.1.0

	 *

	 * @param string|WP_Screen $screen  The screen hook name or screen object.

	 * @param string[]         $columns An array of columns with column IDs as the keys

	 *                                  and translated column names as the values.

	 */

	public function __construct( $screen, $columns = array() ) {

		if ( is_string( $screen ) ) {

			$screen = convert_to_screen( $screen );

		}

		$this->_screen = $screen;

		if ( ! empty( $columns ) ) {

			$this->_columns = $columns;

			add_filter( 'manage_' . $screen->id . '_columns', array( $this, 'get_columns' ), 0 );

		}

	}

	/**

	 * Gets a list of all, hidden, and sortable columns.

	 *

	 * @since 3.1.0

	 *

	 * @return array

	 */

	protected function get_column_info() {

		$columns  = get_column_headers( $this->_screen );

		$hidden   = get_hidden_columns( $this->_screen );

		$sortable = array();

		$primary  = $this->get_default_primary_column_name();

		return array( $columns, $hidden, $sortable, $primary );

	}

	/**

	 * Gets a list of columns.

	 *

	 * @since 3.1.0

	 *

	 * @return array

	 */

	public function get_columns() {

		return $this->_columns;

	}

}