<?php

/**

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

 *

 * @package WordPress

 * @subpackage List_Table

 * @since 3.1.0

 */

/**

 * Fetch an instance of a WP_List_Table class.

 *

 * @access private

 * @since 3.1.0

 *

 * @param string $class The type of the list table, which is the class name.

 * @param array $args Optional. Arguments to pass to the class. Accepts 'screen'.

 * @return object|bool Object on success, false if the class does not exist.

 */

function _get_list_table( $class, $args = array() ) {

	$core_classes = array(

		//Site Admin

		'WP_Posts_List_Table' => 'posts',

		'WP_Media_List_Table' => 'media',

		'WP_Terms_List_Table' => 'terms',

		'WP_Users_List_Table' => 'users',

		'WP_Comments_List_Table' => 'comments',

		'WP_Post_Comments_List_Table' => 'comments',

		'WP_Links_List_Table' => 'links',

		'WP_Plugin_Install_List_Table' => 'plugin-install',

		'WP_Themes_List_Table' => 'themes',

		'WP_Theme_Install_List_Table' => array( 'themes', 'theme-install' ),

		'WP_Plugins_List_Table' => 'plugins',

		// Network Admin

		'WP_MS_Sites_List_Table' => 'ms-sites',

		'WP_MS_Users_List_Table' => 'ms-users',

		'WP_MS_Themes_List_Table' => 'ms-themes',

	);

	if ( isset( $core_classes[ $class ] ) ) {

		foreach ( (array) $core_classes[ $class ] as $required )

			require_once( ABSPATH . 'wp-admin/includes/class-wp-' . $required . '-list-table.php' );

		if ( isset( $args['screen'] ) )

			$args['screen'] = convert_to_screen( $args['screen'] );

		elseif ( isset( $GLOBALS['hook_suffix'] ) )

			$args['screen'] = get_current_screen();

		else

			$args['screen'] = null;

		return new $class( $args );

	}

	return false;

}

/**

 * Register column headers for a particular screen.

 *

 * @since 2.7.0

 *

 * @param string $screen The handle for the screen to add help to. This is usually the hook name returned by the add_*_page() functions.

 * @param array $columns An array of columns with column IDs as the keys and translated column names as the values

 * @see get_column_headers(), print_column_headers(), get_hidden_columns()

 */

function register_column_headers($screen, $columns) {

	$wp_list_table = new _WP_List_Table_Compat($screen, $columns);

}

/**

 * Prints column headers for a particular screen.

 *

 * @since 2.7.0

 */

function print_column_headers($screen, $id = true) {

	$wp_list_table = new _WP_List_Table_Compat($screen);

	$wp_list_table->print_column_headers($id);

}

/**

 * Helper class to be used only by back compat functions

 *

 * @since 3.1.0

 */

class _WP_List_Table_Compat extends WP_List_Table {

	var $_screen;

	var $_columns;

	function _WP_List_Table_Compat( $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 );

		}

	}

	function get_column_info() {

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

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

		$sortable = array();

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

	}

	function get_columns() {

		return $this->_columns;

	}

}