<?php

/**

 * WordPress Administration Screen API.

 *

 * @package WordPress

 * @subpackage Administration

 */

/**

 * Get the column headers for a screen

 *

 * @since 2.7.0

 *

 * @param string|WP_Screen $screen The screen you want the headers for

 * @return array Containing the headers in the format id => UI String

 */

function get_column_headers( $screen ) {

	if ( is_string( $screen ) )

		$screen = convert_to_screen( $screen );

	static $column_headers = array();

	if ( ! isset( $column_headers[ $screen->id ] ) )

		$column_headers[ $screen->id ] = apply_filters( 'manage_' . $screen->id . '_columns', array() );

	return $column_headers[ $screen->id ];

}

/**

 * Get a list of hidden columns.

 *

 * @since 2.7.0

 *

 * @param string|WP_Screen $screen The screen you want the hidden columns for

 * @return array

 */

function get_hidden_columns( $screen ) {

	if ( is_string( $screen ) )

		$screen = convert_to_screen( $screen );

	return (array) get_user_option( 'manage' . $screen->id . 'columnshidden' );

}

/**

 * Prints the meta box preferences for screen meta.

 *

 * @since 2.7.0

 *

 * @param string|WP_Screen $screen

 */

function meta_box_prefs( $screen ) {

	global $wp_meta_boxes;

	if ( is_string( $screen ) )

		$screen = convert_to_screen( $screen );

	if ( empty($wp_meta_boxes[$screen->id]) )

		return;

	$hidden = get_hidden_meta_boxes($screen);

	foreach ( array_keys($wp_meta_boxes[$screen->id]) as $context ) {

		foreach ( array_keys($wp_meta_boxes[$screen->id][$context]) as $priority ) {

			foreach ( $wp_meta_boxes[$screen->id][$context][$priority] as $box ) {

				if ( false == $box || ! $box['title'] )

					continue;

				// Submit box cannot be hidden

				if ( 'submitdiv' == $box['id'] || 'linksubmitdiv' == $box['id'] )

					continue;

				$box_id = $box['id'];

				echo '<label for="' . $box_id . '-hide">';

				echo '<input class="hide-postbox-tog" name="' . $box_id . '-hide" type="checkbox" id="' . $box_id . '-hide" value="' . $box_id . '"' . (! in_array($box_id, $hidden) ? ' checked="checked"' : '') . ' />';

				echo "{$box['title']}</label>\n";

			}

		}

	}

}

/**

 * Get Hidden Meta Boxes

 *

 * @since 2.7.0

 *

 * @param string|WP_Screen $screen Screen identifier

 * @return array Hidden Meta Boxes

 */

function get_hidden_meta_boxes( $screen ) {

	if ( is_string( $screen ) )

		$screen = convert_to_screen( $screen );

	$hidden = get_user_option( "metaboxhidden_{$screen->id}" );

	$use_defaults = ! is_array( $hidden );

	// Hide slug boxes by default

	if ( $use_defaults ) {

		$hidden = array();

		if ( 'post' == $screen->base ) {

			if ( 'post' == $screen->post_type || 'page' == $screen->post_type )

				$hidden = array('slugdiv', 'trackbacksdiv', 'postcustom', 'postexcerpt', 'commentstatusdiv', 'commentsdiv', 'authordiv', 'revisionsdiv');

			else

				$hidden = array( 'slugdiv' );

		}

		$hidden = apply_filters( 'default_hidden_meta_boxes', $hidden, $screen );

	}

	return apply_filters( 'hidden_meta_boxes', $hidden, $screen, $use_defaults );

}

/**

 * Register and configure an admin screen option

 *

 * @since 3.1.0

 *

 * @param string $option An option name.

 * @param mixed $args Option-dependent arguments.

 */

function add_screen_option( $option, $args = array() ) {

	$current_screen = get_current_screen();

	if ( ! $current_screen )

		return;

	$current_screen->add_option( $option, $args );

}

/**

 * Displays a screen icon.

 *

 * @uses get_screen_icon()

 * @since 2.7.0

 *

 * @param string|WP_Screen $screen Optional. Accepts a screen object (and defaults to the current screen object)

 * 	which it uses to determine an icon HTML ID. Or, if a string is provided, it is used to form the icon HTML ID.

 */

function screen_icon( $screen = '' ) {

	echo get_screen_icon( $screen );

}

/**

 * Gets a screen icon.

 *

 * @since 3.2.0

 *

 * @param string|WP_Screen $screen Optional. Accepts a screen object (and defaults to the current screen object)

 * 	which it uses to determine an icon HTML ID. Or, if a string is provided, it is used to form the icon HTML ID.

 * @return string HTML for the screen icon.

 */

function get_screen_icon( $screen = '' ) {

	if ( empty( $screen ) )

		$screen = get_current_screen();

	elseif ( is_string( $screen ) )

		$icon_id = $screen;

	$class = 'icon32';

	if ( empty( $icon_id ) ) {

		if ( ! empty( $screen->parent_base ) )

			$icon_id = $screen->parent_base;

		else

			$icon_id = $screen->base;

		if ( 'page' == $screen->post_type )

			$icon_id = 'edit-pages';

		if ( $screen->post_type )

			$class .= ' ' . sanitize_html_class( 'icon32-posts-' . $screen->post_type );

	}

	return '<div id="icon-' . esc_attr( $icon_id ) . '" class="' . $class . '"><br /></div>';

}

/**

 * Get the current screen object

 *

 * @since 3.1.0

 *

 * @return WP_Screen Current screen object

 */

function get_current_screen() {

	global $current_screen;

	if ( ! isset( $current_screen ) )

		return null;

	return $current_screen;

}

/**

 * Set the current screen object

 *

 * @since 3.0.0

 * @uses $current_screen

 *

 * @param mixed $hook_name Optional. The hook name (also known as the hook suffix) used to determine the screen,

 *	or an existing screen object.

 */

function set_current_screen( $hook_name = '' ) {

	WP_Screen::get( $hook_name )->set_current_screen();

}

/**

 * A class representing the admin screen.

 *

 * @since 3.3.0

 * @access public

 */

final class WP_Screen {

	/**

	 * Any action associated with the screen. 'add' for *-add.php and *-new.php screens. Empty otherwise.

	 *

	 * @since 3.3.0

	 * @var string

	 * @access public

	 */

	public $action;

	/**

	 * The base type of the screen. This is typically the same as $id but with any post types and taxonomies stripped.

	 * For example, for an $id of 'edit-post' the base is 'edit'.

	 *

	 * @since 3.3.0

	 * @var string

	 * @access public

	 */

	public $base;

	/**

	 * The number of columns to display. Access with get_columns().

	 *

	 * @since 3.4.0

	 * @var int

	 * @access private

	 */

	private $columns = 0;

	/**

	 * The unique ID of the screen.

	 *

	 * @since 3.3.0

	 * @var string

	 * @access public

	 */

	public $id;

	/**

	 * Whether the screen is in the network admin.

	 *

	 * @since 3.3.0

	 * @var bool

	 * @access public

	 */

	public $is_network;

	/**

	 * Whether the screen is in the user admin.

	 *

	 * @since 3.3.0

	 * @var bool

	 * @access public

	 */

	public $is_user;

	/**

	 * The base menu parent.

	 * This is derived from $parent_file by removing the query string and any .php extension.

	 * $parent_file values of 'edit.php?post_type=page' and 'edit.php?post_type=post' have a $parent_base of 'edit'.

	 *

	 * @since 3.3.0

	 * @var string

	 * @access public

	 */

	public $parent_base;

	/**

	 * The parent_file for the screen per the admin menu system.

	 * Some $parent_file values are 'edit.php?post_type=page', 'edit.php', and 'options-general.php'.

	 *

	 * @since 3.3.0

	 * @var string

	 * @access public

	 */

	public $parent_file;

	/**

	 * The post type associated with the screen, if any.

	 * The 'edit.php?post_type=page' screen has a post type of 'page'.

	 * The 'edit-tags.php?taxonomy=$taxonomy&post_type=page' screen has a post type of 'page'.

	 *

	 * @since 3.3.0

	 * @var string

	 * @access public

	 */

	public $post_type;

	/**

	 * The taxonomy associated with the screen, if any.

	 * The 'edit-tags.php?taxonomy=category' screen has a taxonomy of 'category'.

	 * @since 3.3.0

	 * @var string

	 * @access public

	 */

	public $taxonomy;

	/**

	 * The help tab data associated with the screen, if any.

 	 *

 	 * @since 3.3.0

 	 * @var array

 	 * @access private

 	 */

	private $_help_tabs = array();

 	/**

	 * The help sidebar data associated with screen, if any.

	 *

	 * @since 3.3.0

	 * @var string

	 * @access private

 	 */

	private $_help_sidebar = '';

	/**

	 * Stores old string-based help.

	 */

	private static $_old_compat_help = array();

	/**

	 * The screen options associated with screen, if any.

	 *

	 * @since 3.3.0

	 * @var array

	 * @access private

	 */

	private $_options = array();

	/**

	 * The screen object registry.

	 *

	 * @since 3.3.0

	 * @var array

	 * @access private

	 */

	private static $_registry = array();

	/**

	 * Stores the result of the public show_screen_options function.

	 *

	 * @since 3.3.0

	 * @var bool

	 * @access private

	 */

	private $_show_screen_options;

	/**

	 * Stores the 'screen_settings' section of screen options.

	 *

	 * @since 3.3.0

	 * @var string

	 * @access private

	 */

	private $_screen_settings;

 	/**

	 * Fetches a screen object.

 	 *

 	 * @since 3.3.0

	 * @access public

 	 *

	 * @param string $hook_name Optional. The hook name (also known as the hook suffix) used to determine the screen.

	 * 	Defaults to the current $hook_suffix global.

	 * @return WP_Screen Screen object.

 	 */

	public static function get( $hook_name = '' ) {

		if ( is_a( $hook_name, 'WP_Screen' ) )

			return $hook_name;

		$post_type = $taxonomy = null;

		$is_network = $is_user = false;

		$action = '';

		if ( $hook_name )

			$id = $hook_name;

		else

			$id = $GLOBALS['hook_suffix'];

		// For those pesky meta boxes.

		if ( $hook_name && post_type_exists( $hook_name ) ) {

			$post_type = $id;

			$id = 'post'; // changes later. ends up being $base.

		} else {

			if ( '.php' == substr( $id, -4 ) )

				$id = substr( $id, 0, -4 );

			if ( 'post-new' == $id || 'link-add' == $id || 'media-new' == $id || 'user-new' == $id ) {

				$id = substr( $id, 0, -4 );

				$action = 'add';

			}

		}

		if ( ! $post_type && $hook_name ) {

			if ( '-network' == substr( $id, -8 ) ) {

				$id = substr( $id, 0, -8 );

				$is_network = true;

			} elseif ( '-user' == substr( $id, -5 ) ) {

				$id = substr( $id, 0, -5 );

				$is_user = true;

			}

			$id = sanitize_key( $id );

			if ( 'edit-comments' != $id && 'edit-tags' != $id && 'edit-' == substr( $id, 0, 5 ) ) {

				$maybe = substr( $id, 5 );

				if ( taxonomy_exists( $maybe ) ) {

 					$id = 'edit-tags';

					$taxonomy = $maybe;

				} elseif ( post_type_exists( $maybe ) ) {

					$id = 'edit';

					$post_type = $maybe;

				}

 			}

		} else {

			$is_network = is_network_admin();

			$is_user = is_user_admin();

		}

		if ( 'index' == $id )

			$id = 'dashboard';

		$base = $id;

		// If this is the current screen, see if we can be more accurate for post types and taxonomies.

		if ( ! $hook_name ) {

			if ( isset( $_REQUEST['post_type'] ) )

				$post_type = post_type_exists( $_REQUEST['post_type'] ) ? $_REQUEST['post_type'] : false;

			if ( isset( $_REQUEST['taxonomy'] ) )

				$taxonomy = taxonomy_exists( $_REQUEST['taxonomy'] ) ? $_REQUEST['taxonomy'] : false;

			switch ( $base ) {

				case 'post' :

					if ( isset( $_GET['post'] ) )

						$post_id = (int) $_GET['post'];

					elseif ( isset( $_POST['post_ID'] ) )