WordPress 4.4
[autoinstalls/wordpress.git] / wp-admin / includes / screen.php
index 3572446d89e33af03f47168d1be91c230572db86..8db0cde4336a72d2618cfeef6ffa1e745fd9884d 100644 (file)
@@ -11,6 +11,8 @@
  *
  * @since 2.7.0
  *
+ * @staticvar array $column_headers
+ *
  * @param string|WP_Screen $screen The screen you want the headers for
  * @return array Containing the headers in the format id => UI String
  */
@@ -49,10 +51,35 @@ function get_column_headers( $screen ) {
  * @return array
  */
 function get_hidden_columns( $screen ) {
-       if ( is_string( $screen ) )
+       if ( is_string( $screen ) ) {
                $screen = convert_to_screen( $screen );
+       }
+
+       $hidden = get_user_option( 'manage' . $screen->id . 'columnshidden' );
+
+       if ( ! $hidden ) {
+               $hidden = array();
+
+               /**
+                * Filter the default list of hidden columns.
+                *
+                * @since 4.4.0
+                *
+                * @param array     $hidden An array of columns hidden by default.
+                * @param WP_Screen $screen WP_Screen object of the current screen.
+                */
+               $hidden = apply_filters( 'default_hidden_columns', $hidden, $screen );
+       }
 
-       return (array) get_user_option( 'manage' . $screen->id . 'columnshidden' );
+       /**
+        * Filter the list of hidden columns.
+        *
+        * @since 4.4.0
+        *
+        * @param array     $hidden An array of hidden columns.
+        * @param WP_Screen $screen WP_Screen object of the current screen.
+        */
+       return apply_filters( 'hidden_columns', $hidden, $screen );
 }
 
 /**
@@ -60,6 +87,8 @@ function get_hidden_columns( $screen ) {
  *
  * @since 2.7.0
  *
+ * @global array $wp_meta_boxes
+ *
  * @param WP_Screen $screen
  */
 function meta_box_prefs( $screen ) {
@@ -73,9 +102,12 @@ function meta_box_prefs( $screen ) {
 
        $hidden = get_hidden_meta_boxes($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 ) {
+       foreach ( array_keys( $wp_meta_boxes[ $screen->id ] ) as $context ) {
+               foreach ( array( 'high', 'core', 'default', 'low' ) as $priority ) {
+                       if ( ! isset( $wp_meta_boxes[ $screen->id ][ $context ][ $priority ] ) ) {
+                               continue;
+                       }
+                       foreach ( $wp_meta_boxes[ $screen->id ][ $context ][ $priority ] as $box ) {
                                if ( false == $box || ! $box['title'] )
                                        continue;
                                // Submit box cannot be hidden
@@ -162,6 +194,8 @@ function add_screen_option( $option, $args = array() ) {
  *
  * @since 3.1.0
  *
+ * @global WP_Screen $current_screen
+ *
  * @return WP_Screen Current screen object
  */
 function get_current_screen() {
@@ -179,1007 +213,8 @@ function get_current_screen() {
  * @since 3.0.0
  *
  * @param mixed $hook_name Optional. The hook name (also known as the hook suffix) used to determine the screen,
- *     or an existing screen object.
+ *                            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;
-
-       /**
-        * Which admin the screen is in. network | user | site | false
-        *
-        * @since 3.5.0
-        * @var string
-        * @access protected
-        */
-       protected $in_admin;
-
-       /**
-        * Whether the screen is in the network admin.
-        *
-        * Deprecated. Use in_admin() instead.
-        *
-        * @since 3.3.0
-        * @deprecated 3.5.0
-        * @var bool
-        * @access public
-        */
-       public $is_network;
-
-       /**
-        * Whether the screen is in the user admin.
-        *
-        * Deprecated. Use in_admin() instead.
-        *
-        * @since 3.3.0
-        * @deprecated 3.5.0
-        * @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|WP_Screen $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 ( $hook_name instanceof WP_Screen ) {
-                       return $hook_name;
-               }
-
-               $post_type = $taxonomy = null;
-               $in_admin = 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 );
-                               $in_admin = 'network';
-                       } elseif ( '-user' == substr( $id, -5 ) ) {
-                               $id = substr( $id, 0, -5 );
-                               $in_admin = 'user';
-                       }
-
-                       $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;
-                               }
-                       }
-
-                       if ( ! $in_admin )
-                               $in_admin = 'site';
-               } else {
-                       if ( defined( 'WP_NETWORK_ADMIN' ) && WP_NETWORK_ADMIN )
-                               $in_admin = 'network';
-                       elseif ( defined( 'WP_USER_ADMIN' ) && WP_USER_ADMIN )
-                               $in_admin = 'user';
-                       else
-                               $in_admin = 'site';
-               }
-
-               if ( 'index' == $id )
-                       $id = 'dashboard';
-               elseif ( 'front' == $id )
-                       $in_admin = false;
-
-               $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'] ) )
-                                               $post_id = (int) $_POST['post_ID'];
-                                       else
-                                               $post_id = 0;
-
-                                       if ( $post_id ) {
-                                               $post = get_post( $post_id );
-                                               if ( $post )
-                                                       $post_type = $post->post_type;
-                                       }
-                                       break;
-                               case 'edit-tags' :
-                                       if ( null === $post_type && is_object_in_taxonomy( 'post', $taxonomy ? $taxonomy : 'post_tag' ) )
-                                               $post_type = 'post';
-                                       break;
-                       }
-               }
-
-               switch ( $base ) {
-                       case 'post' :
-                               if ( null === $post_type )
-                                       $post_type = 'post';
-                               $id = $post_type;
-                               break;
-                       case 'edit' :
-                               if ( null === $post_type )
-                                       $post_type = 'post';
-                               $id .= '-' . $post_type;
-                               break;
-                       case 'edit-tags' :
-                               if ( null === $taxonomy )
-                                       $taxonomy = 'post_tag';
-                               // The edit-tags ID does not contain the post type. Look for it in the request.
-                               if ( null === $post_type ) {
-                                       $post_type = 'post';
-                                       if ( isset( $_REQUEST['post_type'] ) && post_type_exists( $_REQUEST['post_type'] ) )
-                                               $post_type = $_REQUEST['post_type'];
-                               }
-
-                               $id = 'edit-' . $taxonomy;
-                               break;
-               }
-
-               if ( 'network' == $in_admin ) {
-                       $id   .= '-network';
-                       $base .= '-network';
-               } elseif ( 'user' == $in_admin ) {
-                       $id   .= '-user';
-                       $base .= '-user';
-               }
-
-               if ( isset( self::$_registry[ $id ] ) ) {
-                       $screen = self::$_registry[ $id ];
-                       if ( $screen === get_current_screen() )
-                               return $screen;
-               } else {
-                       $screen = new WP_Screen();
-                       $screen->id     = $id;
-               }
-
-               $screen->base       = $base;
-               $screen->action     = $action;
-               $screen->post_type  = (string) $post_type;
-               $screen->taxonomy   = (string) $taxonomy;
-               $screen->is_user    = ( 'user' == $in_admin );
-               $screen->is_network = ( 'network' == $in_admin );
-               $screen->in_admin   = $in_admin;
-
-               self::$_registry[ $id ] = $screen;
-
-               return $screen;
-       }
-
-       /**
-        * Makes the screen object the current screen.
-        *
-        * @see set_current_screen()
-        * @since 3.3.0
-        */
-       public function set_current_screen() {
-               global $current_screen, $taxnow, $typenow;
-               $current_screen = $this;
-               $taxnow = $this->taxonomy;
-               $typenow = $this->post_type;
-
-               /**
-                * Fires after the current screen has been set.
-                *
-                * @since 3.0.0
-                *
-                * @param WP_Screen $current_screen Current WP_Screen object.
-                */
-               do_action( 'current_screen', $current_screen );
-       }
-
-       /**
-        * Constructor
-        *
-        * @since 3.3.0
-        * @access private
-        */
-       private function __construct() {}
-
-       /**
-        * Indicates whether the screen is in a particular admin
-        *
-        * @since 3.5.0
-        *
-        * @param string $admin The admin to check against (network | user | site).
-        * If empty any of the three admins will result in true.
-        * @return boolean True if the screen is in the indicated admin, false otherwise.
-        *
-        */
-       public function in_admin( $admin = null ) {
-               if ( empty( $admin ) )
-                       return (bool) $this->in_admin;
-
-               return ( $admin == $this->in_admin );
-       }
-
-       /**
-        * Sets the old string-based contextual help for the screen.
-        *
-        * For backwards compatibility.
-        *
-        * @since 3.3.0
-        *
-        * @param WP_Screen $screen A screen object.
-        * @param string $help Help text.
-        */
-       public static function add_old_compat_help( $screen, $help ) {
-               self::$_old_compat_help[ $screen->id ] = $help;
-       }
-
-       /**
-        * Set the parent information for the screen.
-        * This is called in admin-header.php after the menu parent for the screen has been determined.
-        *
-        * @since 3.3.0
-        *
-        * @param string $parent_file The parent file of the screen. Typically the $parent_file global.
-        */
-       public function set_parentage( $parent_file ) {
-               $this->parent_file = $parent_file;
-               list( $this->parent_base ) = explode( '?', $parent_file );
-               $this->parent_base = str_replace( '.php', '', $this->parent_base );
-       }
-
-       /**
-        * Adds an option for the screen.
-        * Call this in template files after admin.php is loaded and before admin-header.php is loaded to add screen options.
-        *
-        * @since 3.3.0
-        *
-        * @param string $option Option ID
-        * @param mixed $args Option-dependent arguments.
-        */
-       public function add_option( $option, $args = array() ) {
-               $this->_options[ $option ] = $args;
-       }
-
-       /**
-        * Remove an option from the screen.
-        *
-        * @since 3.8.0
-        *
-        * @param string $option Option ID.
-        */
-       public function remove_option( $option ) {
-               unset( $this->_options[ $option ] );
-       }
-
-       /**
-        * Remove all options from the screen.
-        *
-        * @since 3.8.0
-        */
-       public function remove_options() {
-               $this->_options = array();
-       }
-
-       /**
-        * Get the options registered for the screen.
-        *
-        * @since 3.8.0
-        *
-        * @return array Options with arguments.
-        */
-       public function get_options() {
-               return $this->_options;
-       }
-
-       /**
-        * Gets the arguments for an option for the screen.
-        *
-        * @since 3.3.0
-        *
-        * @param string $option Option name.
-        * @param string $key    Optional. Specific array key for when the option is an array.
-        *                       Default false.
-        * @return string The option value if set, null otherwise.
-        */
-       public function get_option( $option, $key = false ) {
-               if ( ! isset( $this->_options[ $option ] ) )
-                       return null;
-               if ( $key ) {
-                       if ( isset( $this->_options[ $option ][ $key ] ) )
-                               return $this->_options[ $option ][ $key ];
-                       return null;
-               }
-               return $this->_options[ $option ];
-       }
-
-       /**
-        * Gets the help tabs registered for the screen.
-        *
-        * @since 3.4.0
-        *
-        * @return array Help tabs with arguments.
-        */
-       public function get_help_tabs() {
-               return $this->_help_tabs;
-       }
-
-       /**
-        * Gets the arguments for a help tab.
-        *
-        * @since 3.4.0
-        *
-        * @param string $id Help Tab ID.
-        * @return array Help tab arguments.
-        */
-       public function get_help_tab( $id ) {
-               if ( ! isset( $this->_help_tabs[ $id ] ) )
-                       return null;
-               return $this->_help_tabs[ $id ];
-       }
-
-       /**
-        * Add a help tab to the contextual help for the screen.
-        * Call this on the load-$pagenow hook for the relevant screen.
-        *
-        * @since 3.3.0
-        *
-        * @param array $args
-        * - string   - title    - Title for the tab.
-        * - string   - id       - Tab ID. Must be HTML-safe.
-        * - string   - content  - Help tab content in plain text or HTML. Optional.
-        * - callback - callback - A callback to generate the tab content. Optional.
-        *
-        */
-       public function add_help_tab( $args ) {
-               $defaults = array(
-                       'title'    => false,
-                       'id'       => false,
-                       'content'  => '',
-                       'callback' => false,
-               );
-               $args = wp_parse_args( $args, $defaults );
-
-               $args['id'] = sanitize_html_class( $args['id'] );
-
-               // Ensure we have an ID and title.
-               if ( ! $args['id'] || ! $args['title'] )
-                       return;
-
-               // Allows for overriding an existing tab with that ID.
-               $this->_help_tabs[ $args['id'] ] = $args;
-       }
-
-       /**
-        * Removes a help tab from the contextual help for the screen.
-        *
-        * @since 3.3.0
-        *
-        * @param string $id The help tab ID.
-        */
-       public function remove_help_tab( $id ) {
-               unset( $this->_help_tabs[ $id ] );
-       }
-
-       /**
-        * Removes all help tabs from the contextual help for the screen.
-        *
-        * @since 3.3.0
-        */
-       public function remove_help_tabs() {
-               $this->_help_tabs = array();
-       }
-
-       /**
-        * Gets the content from a contextual help sidebar.
-        *
-        * @since 3.4.0
-        *
-        * @return string Contents of the help sidebar.
-        */
-       public function get_help_sidebar() {
-               return $this->_help_sidebar;
-       }
-
-       /**
-        * Add a sidebar to the contextual help for the screen.
-        * Call this in template files after admin.php is loaded and before admin-header.php is loaded to add a sidebar to the contextual help.
-        *
-        * @since 3.3.0
-        *
-        * @param string $content Sidebar content in plain text or HTML.
-        */
-       public function set_help_sidebar( $content ) {
-               $this->_help_sidebar = $content;
-       }
-
-       /**
-        * Gets the number of layout columns the user has selected.
-        *
-        * The layout_columns option controls the max number and default number of
-        * columns. This method returns the number of columns within that range selected
-        * by the user via Screen Options. If no selection has been made, the default
-        * provisioned in layout_columns is returned. If the screen does not support
-        * selecting the number of layout columns, 0 is returned.
-        *
-        * @since 3.4.0
-        *
-        * @return int Number of columns to display.
-        */
-       public function get_columns() {
-               return $this->columns;
-       }
-
-       /**
-        * Render the screen's help section.
-        *
-        * This will trigger the deprecated filters for backwards compatibility.
-        *
-        * @since 3.3.0
-        */
-       public function render_screen_meta() {
-
-               /**
-                * Filter the legacy contextual help list.
-                *
-                * @since 2.7.0
-                * @deprecated 3.3.0 Use get_current_screen()->add_help_tab() or
-                *                   get_current_screen()->remove_help_tab() instead.
-                *
-                * @param array     $old_compat_help Old contextual help.
-                * @param WP_Screen $this            Current WP_Screen instance.
-                */
-               self::$_old_compat_help = apply_filters( 'contextual_help_list', self::$_old_compat_help, $this );
-
-               $old_help = isset( self::$_old_compat_help[ $this->id ] ) ? self::$_old_compat_help[ $this->id ] : '';
-
-               /**
-                * Filter the legacy contextual help text.
-                *
-                * @since 2.7.0
-                * @deprecated 3.3.0 Use get_current_screen()->add_help_tab() or
-                *                   get_current_screen()->remove_help_tab() instead.
-                *
-                * @param string    $old_help  Help text that appears on the screen.
-                * @param string    $screen_id Screen ID.
-                * @param WP_Screen $this      Current WP_Screen instance.
-                *
-                */
-               $old_help = apply_filters( 'contextual_help', $old_help, $this->id, $this );
-
-               // Default help only if there is no old-style block of text and no new-style help tabs.
-               if ( empty( $old_help ) && ! $this->get_help_tabs() ) {
-
-                       /**
-                        * Filter the default legacy contextual help text.
-                        *
-                        * @since 2.8.0
-                        * @deprecated 3.3.0 Use get_current_screen()->add_help_tab() or
-                        *                   get_current_screen()->remove_help_tab() instead.
-                        *
-                        * @param string $old_help_default Default contextual help text.
-                        */
-                       $default_help = apply_filters( 'default_contextual_help', '' );
-                       if ( $default_help )
-                               $old_help = '<p>' . $default_help . '</p>';
-               }
-
-               if ( $old_help ) {
-                       $this->add_help_tab( array(
-                               'id'      => 'old-contextual-help',
-                               'title'   => __('Overview'),
-                               'content' => $old_help,
-                       ) );
-               }
-
-               $help_sidebar = $this->get_help_sidebar();
-
-               $help_class = 'hidden';
-               if ( ! $help_sidebar )
-                       $help_class .= ' no-sidebar';
-
-               // Time to render!
-               ?>
-               <div id="screen-meta" class="metabox-prefs">
-
-                       <div id="contextual-help-wrap" class="<?php echo esc_attr( $help_class ); ?>" tabindex="-1" aria-label="<?php esc_attr_e('Contextual Help Tab'); ?>">
-                               <div id="contextual-help-back"></div>
-                               <div id="contextual-help-columns">
-                                       <div class="contextual-help-tabs">
-                                               <ul>
-                                               <?php
-                                               $class = ' class="active"';
-                                               foreach ( $this->get_help_tabs() as $tab ) :
-                                                       $link_id  = "tab-link-{$tab['id']}";
-                                                       $panel_id = "tab-panel-{$tab['id']}";
-                                                       ?>
-
-                                                       <li id="<?php echo esc_attr( $link_id ); ?>"<?php echo $class; ?>>
-                                                               <a href="<?php echo esc_url( "#$panel_id" ); ?>" aria-controls="<?php echo esc_attr( $panel_id ); ?>">
-                                                                       <?php echo esc_html( $tab['title'] ); ?>
-                                                               </a>
-                                                       </li>
-                                               <?php
-                                                       $class = '';
-                                               endforeach;
-                                               ?>
-                                               </ul>
-                                       </div>
-
-                                       <?php if ( $help_sidebar ) : ?>
-                                       <div class="contextual-help-sidebar">
-                                               <?php echo $help_sidebar; ?>
-                                       </div>
-                                       <?php endif; ?>
-
-                                       <div class="contextual-help-tabs-wrap">
-                                               <?php
-                                               $classes = 'help-tab-content active';
-                                               foreach ( $this->get_help_tabs() as $tab ):
-                                                       $panel_id = "tab-panel-{$tab['id']}";
-                                                       ?>
-
-                                                       <div id="<?php echo esc_attr( $panel_id ); ?>" class="<?php echo $classes; ?>">
-                                                               <?php
-                                                               // Print tab content.
-                                                               echo $tab['content'];
-
-                                                               // If it exists, fire tab callback.
-                                                               if ( ! empty( $tab['callback'] ) )
-                                                                       call_user_func_array( $tab['callback'], array( $this, $tab ) );
-                                                               ?>
-                                                       </div>
-                                               <?php
-                                                       $classes = 'help-tab-content';
-                                               endforeach;
-                                               ?>
-                                       </div>
-                               </div>
-                       </div>
-               <?php
-               // Setup layout columns
-
-               /**
-                * Filter the array of screen layout columns.
-                *
-                * This hook provides back-compat for plugins using the back-compat
-                * filter instead of add_screen_option().
-                *
-                * @since 2.8.0
-                *
-                * @param array     $empty_columns Empty array.
-                * @param string    $screen_id     Screen ID.
-                * @param WP_Screen $this          Current WP_Screen instance.
-                */
-               $columns = apply_filters( 'screen_layout_columns', array(), $this->id, $this );
-
-               if ( ! empty( $columns ) && isset( $columns[ $this->id ] ) )
-                       $this->add_option( 'layout_columns', array('max' => $columns[ $this->id ] ) );
-
-               if ( $this->get_option( 'layout_columns' ) ) {
-                       $this->columns = (int) get_user_option("screen_layout_$this->id");
-
-                       if ( ! $this->columns && $this->get_option( 'layout_columns', 'default' ) )
-                               $this->columns = $this->get_option( 'layout_columns', 'default' );
-               }
-               $GLOBALS[ 'screen_layout_columns' ] = $this->columns; // Set the global for back-compat.
-
-               // Add screen options
-               if ( $this->show_screen_options() )
-                       $this->render_screen_options();
-               ?>
-               </div>
-               <?php
-               if ( ! $this->get_help_tabs() && ! $this->show_screen_options() )
-                       return;
-               ?>
-               <div id="screen-meta-links">
-               <?php if ( $this->get_help_tabs() ) : ?>
-                       <div id="contextual-help-link-wrap" class="hide-if-no-js screen-meta-toggle">
-                       <a href="#contextual-help-wrap" id="contextual-help-link" class="show-settings" aria-controls="contextual-help-wrap" aria-expanded="false"><?php _e( 'Help' ); ?></a>
-                       </div>
-               <?php endif;
-               if ( $this->show_screen_options() ) : ?>
-                       <div id="screen-options-link-wrap" class="hide-if-no-js screen-meta-toggle">
-                       <a href="#screen-options-wrap" id="show-settings-link" class="show-settings" aria-controls="screen-options-wrap" aria-expanded="false"><?php _e( 'Screen Options' ); ?></a>
-                       </div>
-               <?php endif; ?>
-               </div>
-               <?php
-       }
-
-       public function show_screen_options() {
-               global $wp_meta_boxes;
-
-               if ( is_bool( $this->_show_screen_options ) )
-                       return $this->_show_screen_options;
-
-               $columns = get_column_headers( $this );
-
-               $show_screen = ! empty( $wp_meta_boxes[ $this->id ] ) || $columns || $this->get_option( 'per_page' );
-
-               switch ( $this->base ) {
-                       case 'widgets':
-                               $this->_screen_settings = '<p><a id="access-on" href="widgets.php?widgets-access=on">' . __('Enable accessibility mode') . '</a><a id="access-off" href="widgets.php?widgets-access=off">' . __('Disable accessibility mode') . "</a></p>\n";
-                               break;
-                       case 'post' :
-                               $expand = '<div class="editor-expand hidden"><label for="editor-expand-toggle">';
-                               $expand .= '<input type="checkbox" id="editor-expand-toggle"' . checked( get_user_setting( 'editor_expand', 'on' ), 'on', false ) . ' />';
-                               $expand .= __( 'Enable full-height editor and distraction-free functionality.' ) . '</label></div>';
-                               $this->_screen_settings = $expand;
-                               break;
-                       default:
-                               $this->_screen_settings = '';
-                               break;
-               }
-
-               /**
-                * Filter the screen settings text displayed in the Screen Options tab.
-                *
-                * This filter is currently only used on the Widgets screen to enable
-                * accessibility mode.
-                *
-                * @since 3.0.0
-                *
-                * @param string    $screen_settings Screen settings.
-                * @param WP_Screen $this            WP_Screen object.
-                */
-               $this->_screen_settings = apply_filters( 'screen_settings', $this->_screen_settings, $this );
-
-               if ( $this->_screen_settings || $this->_options )
-                       $show_screen = true;
-
-               /**
-                * Filter whether to show the Screen Options tab.
-                *
-                * @since 3.2.0
-                *
-                * @param bool      $show_screen Whether to show Screen Options tab.
-                *                               Default true.
-                * @param WP_Screen $this        Current WP_Screen instance.
-                */
-               $this->_show_screen_options = apply_filters( 'screen_options_show_screen', $show_screen, $this );
-               return $this->_show_screen_options;
-       }
-
-       /**
-        * Render the screen options tab.
-        *
-        * @since 3.3.0
-        */
-       public function render_screen_options() {
-               global $wp_meta_boxes;
-
-               $columns = get_column_headers( $this );
-               $hidden  = get_hidden_columns( $this );
-
-               ?>
-               <div id="screen-options-wrap" class="hidden" tabindex="-1" aria-label="<?php esc_attr_e('Screen Options Tab'); ?>">
-               <form id="adv-settings" method="post">
-               <?php if ( isset( $wp_meta_boxes[ $this->id ] ) || $this->get_option( 'per_page' ) || ( $columns && empty( $columns['_title'] ) ) ) : ?>
-                       <h5><?php _e( 'Show on screen' ); ?></h5>
-               <?php
-               endif;
-
-               if ( isset( $wp_meta_boxes[ $this->id ] ) ) : ?>
-                       <div class="metabox-prefs">
-                               <?php
-                                       meta_box_prefs( $this );
-
-                                       if ( 'dashboard' === $this->id && has_action( 'welcome_panel' ) && current_user_can( 'edit_theme_options' ) ) {
-                                               if ( isset( $_GET['welcome'] ) ) {
-                                                       $welcome_checked = empty( $_GET['welcome'] ) ? 0 : 1;
-                                                       update_user_meta( get_current_user_id(), 'show_welcome_panel', $welcome_checked );
-                                               } else {
-                                                       $welcome_checked = get_user_meta( get_current_user_id(), 'show_welcome_panel', true );
-                                                       if ( 2 == $welcome_checked && wp_get_current_user()->user_email != get_option( 'admin_email' ) )
-                                                               $welcome_checked = false;
-                                               }
-                                               echo '<label for="wp_welcome_panel-hide">';
-                                               echo '<input type="checkbox" id="wp_welcome_panel-hide"' . checked( (bool) $welcome_checked, true, false ) . ' />';
-                                               echo _x( 'Welcome', 'Welcome panel' ) . "</label>\n";
-                                       }
-                               ?>
-                               <br class="clear" />
-                       </div>
-                       <?php endif;
-                       if ( $columns ) :
-                               if ( ! empty( $columns['_title'] ) ) : ?>
-                       <h5><?php echo $columns['_title']; ?></h5>
-                       <?php endif; ?>
-                       <div class="metabox-prefs">
-                               <?php
-                               $special = array('_title', 'cb', 'comment', 'media', 'name', 'title', 'username', 'blogname');
-
-                               foreach ( $columns as $column => $title ) {
-                                       // Can't hide these for they are special
-                                       if ( in_array( $column, $special ) )
-                                               continue;
-                                       if ( empty( $title ) )
-                                               continue;
-
-                                       if ( 'comments' == $column )
-                                               $title = __( 'Comments' );
-                                       $id = "$column-hide";
-                                       echo '<label for="' . $id . '">';
-                                       echo '<input class="hide-column-tog" name="' . $id . '" type="checkbox" id="' . $id . '" value="' . $column . '"' . checked( !in_array($column, $hidden), true, false ) . ' />';
-                                       echo "$title</label>\n";
-                               }
-                               ?>
-                               <br class="clear" />
-                       </div>
-               <?php endif;
-
-               $this->render_screen_layout();
-               $this->render_per_page_options();
-               echo $this->_screen_settings;
-
-               ?>
-               <div><?php wp_nonce_field( 'screen-options-nonce', 'screenoptionnonce', false ); ?></div>
-               </form>
-               </div>
-               <?php
-       }
-
-       /**
-        * Render the option for number of columns on the page
-        *
-        * @since 3.3.0
-        */
-       public function render_screen_layout() {
-               if ( ! $this->get_option('layout_columns') )
-                       return;
-
-               $screen_layout_columns = $this->get_columns();
-               $num = $this->get_option( 'layout_columns', 'max' );
-
-               ?>
-               <h5 class="screen-layout"><?php _e('Screen Layout'); ?></h5>
-               <div class='columns-prefs'><?php
-                       _e('Number of Columns:');
-                       for ( $i = 1; $i <= $num; ++$i ):
-                               ?>
-                               <label class="columns-prefs-<?php echo $i; ?>">
-                                       <input type='radio' name='screen_columns' value='<?php echo esc_attr( $i ); ?>'
-                                               <?php checked( $screen_layout_columns, $i ); ?> />
-                                       <?php echo esc_html( $i ); ?>
-                               </label>
-                               <?php
-                       endfor; ?>
-               </div>
-               <?php
-       }
-
-       /**
-        * Render the items per page option
-        *
-        * @since 3.3.0
-        */
-       public function render_per_page_options() {
-               if ( null === $this->get_option( 'per_page' ) ) {
-                       return;
-               }
-
-               $per_page_label = $this->get_option( 'per_page', 'label' );
-               if ( null === $per_page_label ) {
-                       $per_page_label = __( 'Number of items per page:' );
-               }
-
-               $option = $this->get_option( 'per_page', 'option' );
-               if ( ! $option ) {
-                       $option = str_replace( '-', '_', "{$this->id}_per_page" );
-               }
-
-               $per_page = (int) get_user_option( $option );
-               if ( empty( $per_page ) || $per_page < 1 ) {
-                       $per_page = $this->get_option( 'per_page', 'default' );
-                       if ( ! $per_page ) {
-                               $per_page = 20;
-                       }
-               }
-
-               if ( 'edit_comments_per_page' == $option ) {
-                       $comment_status = isset( $_REQUEST['comment_status'] ) ? $_REQUEST['comment_status'] : 'all';
-
-                       /** This filter is documented in wp-admin/includes/class-wp-comments-list-table.php */
-                       $per_page = apply_filters( 'comments_per_page', $per_page, $comment_status );
-               } elseif ( 'categories_per_page' == $option ) {
-                       /** This filter is documented in wp-admin/includes/class-wp-terms-list-table.php */
-                       $per_page = apply_filters( 'edit_categories_per_page', $per_page );
-               } else {
-                       /** This filter is documented in wp-admin/includes/class-wp-list-table.php */
-                       $per_page = apply_filters( $option, $per_page );
-               }
-
-               // Back compat
-               if ( isset( $this->post_type ) ) {
-                       /** This filter is documented in wp-admin/includes/class-wp-posts-list-table.php */
-                       $per_page = apply_filters( 'edit_posts_per_page', $per_page, $this->post_type );
-               }
-
-               ?>
-               <div class="screen-options">
-                       <?php if ( $per_page_label ) : ?>
-                               <label for="<?php echo esc_attr( $option ); ?>"><?php echo $per_page_label; ?></label>
-                               <input type="number" step="1" min="1" max="999" class="screen-per-page" name="wp_screen_options[value]"
-                                       id="<?php echo esc_attr( $option ); ?>" maxlength="3"
-                                       value="<?php echo esc_attr( $per_page ); ?>" />
-                       <?php endif;
-
-                       echo get_submit_button( __( 'Apply' ), 'button', 'screen-options-apply', false ); ?>
-                       <input type="hidden" name="wp_screen_options[option]" value="<?php echo esc_attr( $option ); ?>" />
-               </div>
-               <?php
-       }
-}