WordPress 4.2
[autoinstalls/wordpress.git] / wp-includes / class-wp-customize-setting.php
index dd49f79f2675bf5734b19022baee3162e5aae286..f8f9ce083b9d786d508db9f27044ba8759a828d0 100644 (file)
@@ -1,40 +1,95 @@
 <?php
 /**
- * Customize Setting Class.
+ * WordPress Customize Setting classes
  *
  * @package WordPress
  * @subpackage Customize
  * @since 3.4.0
  */
+
+/**
+ * Customize Setting class.
+ *
+ * Handles saving and sanitizing of settings.
+ *
+ * @since 3.4.0
+ *
+ * @see WP_Customize_Manager
+ */
 class WP_Customize_Setting {
+       /**
+        * @access public
+        * @var WP_Customize_Manager
+        */
        public $manager;
+
+       /**
+        * @access public
+        * @var string
+        */
        public $id;
 
-       public $type            = 'theme_mod';
-       public $capability      = 'edit_theme_options';
+       /**
+        * @access public
+        * @var string
+        */
+       public $type = 'theme_mod';
+
+       /**
+        * Capability required to edit this setting.
+        *
+        * @var string
+        */
+       public $capability = 'edit_theme_options';
+
+       /**
+        * Feature a theme is required to support to enable this setting.
+        *
+        * @access public
+        * @var string
+        */
        public $theme_supports  = '';
        public $default         = '';
        public $transport       = 'refresh';
 
+       /**
+        * Server-side sanitization callback for the setting's value.
+        *
+        * @var callback
+        */
        public $sanitize_callback    = '';
        public $sanitize_js_callback = '';
 
+       /**
+        * Whether or not the setting is initially dirty when created.
+        *
+        * This is used to ensure that a setting will be sent from the pane to the
+        * preview when loading the Customizer. Normally a setting only is synced to
+        * the preview if it has been changed. This allows the setting to be sent
+        * from the start.
+        *
+        * @since 4.2.0
+        * @access public
+        * @var bool
+        */
+       public $dirty = false;
+
        protected $id_data = array();
-       private $_post_value; // Cached, sanitized $_POST value.
 
        /**
         * Constructor.
         *
+        * Any supplied $args override class property defaults.
+        *
         * @since 3.4.0
         *
         * @param WP_Customize_Manager $manager
-        * @param string $id An specific ID of the setting. Can be a
-        *                   theme mod or option name.
-        * @param array $args Setting arguments.
-        * @return WP_Customize_Setting
+        * @param string               $id      An specific ID of the setting. Can be a
+        *                                      theme mod or option name.
+        * @param array                $args    Setting arguments.
         */
-       function __construct( $manager, $id, $args = array() ) {
-               $keys = array_keys( get_class_vars( __CLASS__ ) );
+       public function __construct( $manager, $id, $args = array() ) {
+               $keys = array_keys( get_object_vars( $this ) );
                foreach ( $keys as $key ) {
                        if ( isset( $args[ $key ] ) )
                                $this->$key = $args[ $key ];
@@ -57,16 +112,54 @@ class WP_Customize_Setting {
 
                if ( $this->sanitize_js_callback )
                        add_filter( "customize_sanitize_js_{$this->id}", $this->sanitize_js_callback, 10, 2 );
+       }
+
+       /**
+        * The ID for the current blog when the preview() method was called.
+        *
+        * @since 4.2.0
+        * @access protected
+        * @var int
+        */
+       protected $_previewed_blog_id;
 
-               return $this;
+       /**
+        * Return true if the current blog is not the same as the previewed blog.
+        *
+        * @since 4.2.0
+        * @access public
+        *
+        * @return bool|null Returns null if preview() has not been called yet.
+        */
+       public function is_current_blog_previewed() {
+               if ( ! isset( $this->_previewed_blog_id ) ) {
+                       return null;
+               }
+               return ( get_current_blog_id() === $this->_previewed_blog_id );
        }
 
+       /**
+        * Original non-previewed value stored by the preview method.
+        *
+        * @see WP_Customize_Setting::preview()
+        * @since 4.1.1
+        * @var mixed
+        */
+       protected $_original_value;
+
        /**
         * Handle previewing the setting.
         *
         * @since 3.4.0
         */
        public function preview() {
+               if ( ! isset( $this->_original_value ) ) {
+                       $this->_original_value = $this->value();
+               }
+               if ( ! isset( $this->_previewed_blog_id ) ) {
+                       $this->_previewed_blog_id = get_current_blog_id();
+               }
+
                switch( $this->type ) {
                        case 'theme_mod' :
                                add_filter( 'theme_mod_' . $this->id_data[ 'base' ], array( $this, '_preview_filter' ) );
@@ -80,13 +173,40 @@ class WP_Customize_Setting {
                                }
                                break;
                        default :
-                               do_action( 'customize_preview_' . $this->id );
+
+                               /**
+                                * Fires when the {@see WP_Customize_Setting::preview()} method is called for settings
+                                * not handled as theme_mods or options.
+                                *
+                                * The dynamic portion of the hook name, `$this->id`, refers to the setting ID.
+                                *
+                                * @since 3.4.0
+                                *
+                                * @param WP_Customize_Setting $this {@see WP_Customize_Setting} instance.
+                                */
+                               do_action( "customize_preview_{$this->id}", $this );
+
+                               /**
+                                * Fires when the {@see WP_Customize_Setting::preview()} method is called for settings
+                                * not handled as theme_mods or options.
+                                *
+                                * The dynamic portion of the hook name, `$this->type`, refers to the setting type.
+                                *
+                                * @since 4.1.0
+                                *
+                                * @param WP_Customize_Setting $this {@see WP_Customize_Setting} instance.
+                                */
+                               do_action( "customize_preview_{$this->type}", $this );
                }
        }
 
        /**
         * Callback function to filter the theme mods and options.
         *
+        * If switch_to_blog() was called after the preview() method, and the current
+        * blog is now not the same blog, then this method does a no-op and returns
+        * the original value.
+        *
         * @since 3.4.0
         * @uses WP_Customize_Setting::multidimensional_replace()
         *
@@ -94,45 +214,60 @@ class WP_Customize_Setting {
         * @return mixed New or old value.
         */
        public function _preview_filter( $original ) {
-               return $this->multidimensional_replace( $original, $this->id_data[ 'keys' ], $this->post_value() );
+               if ( ! $this->is_current_blog_previewed() ) {
+                       return $original;
+               }
+
+               $undefined = new stdClass(); // symbol hack
+               $post_value = $this->post_value( $undefined );
+               if ( $undefined === $post_value ) {
+                       $value = $this->_original_value;
+               } else {
+                       $value = $post_value;
+               }
+
+               return $this->multidimensional_replace( $original, $this->id_data['keys'], $value );
        }
 
        /**
-        * Set the value of the parameter for a specific theme.
+        * Check user capabilities and theme supports, and then save
+        * the value of the setting.
         *
         * @since 3.4.0
         *
-        * @return bool False if cap check fails or value isn't set.
+        * @return false|null False if cap check fails or value isn't set.
         */
-       public final function save() {
+       final public function save() {
                $value = $this->post_value();
 
                if ( ! $this->check_capabilities() || ! isset( $value ) )
                        return false;
 
-               do_action( 'customize_save_' . $this->id_data[ 'base' ] );
+               /**
+                * Fires when the WP_Customize_Setting::save() method is called.
+                *
+                * The dynamic portion of the hook name, `$this->id_data['base']` refers to
+                * the base slug of the setting name.
+                *
+                * @since 3.4.0
+                *
+                * @param WP_Customize_Setting $this {@see WP_Customize_Setting} instance.
+                */
+               do_action( 'customize_save_' . $this->id_data[ 'base' ], $this );
 
                $this->update( $value );
        }
 
        /**
-        * Fetches, validates, and sanitizes the $_POST value.
+        * Fetch and sanitize the $_POST value for the setting.
         *
         * @since 3.4.0
         *
         * @param mixed $default A default value which is used as a fallback. Default is null.
         * @return mixed The default value on failure, otherwise the sanitized value.
         */
-       public final function post_value( $default = null ) {
-               if ( isset( $this->_post_value ) )
-                       return $this->_post_value;
-
-               $result = $this->manager->post_value( $this );
-
-               if ( isset( $result ) )
-                       return $this->_post_value = $result;
-               else
-                       return $default;
+       final public function post_value( $default = null ) {
+               return $this->manager->post_value( $this, $default );
        }
 
        /**
@@ -144,12 +279,21 @@ class WP_Customize_Setting {
         * @return mixed Null if an input isn't valid, otherwise the sanitized value.
         */
        public function sanitize( $value ) {
-               $value = stripslashes_deep( $value );
+               $value = wp_unslash( $value );
+
+               /**
+                * Filter a Customize setting value in un-slashed form.
+                *
+                * @since 3.4.0
+                *
+                * @param mixed                $value Value of the setting.
+                * @param WP_Customize_Setting $this  WP_Customize_Setting instance.
+                */
                return apply_filters( "customize_sanitize_{$this->id}", $value, $this );
        }
 
        /**
-        * Set the value of the parameter for a specific theme.
+        * Save the value of the setting, using the related API.
         *
         * @since 3.4.0
         *
@@ -160,12 +304,24 @@ class WP_Customize_Setting {
                switch( $this->type ) {
                        case 'theme_mod' :
                                return $this->_update_theme_mod( $value );
-                               break;
+
                        case 'option' :
                                return $this->_update_option( $value );
-                               break;
+
                        default :
-                               return do_action( 'customize_update_' . $this->type, $value );
+
+                               /**
+                                * Fires when the {@see WP_Customize_Setting::update()} method is called for settings
+                                * not handled as theme_mods or options.
+                                *
+                                * The dynamic portion of the hook name, `$this->type`, refers to the type of setting.
+                                *
+                                * @since 3.4.0
+                                *
+                                * @param mixed                $value Value of the setting.
+                                * @param WP_Customize_Setting $this  WP_Customize_Setting instance.
+                                */
+                               return do_action( 'customize_update_' . $this->type, $value, $this );
                }
        }
 
@@ -190,12 +346,12 @@ class WP_Customize_Setting {
        }
 
        /**
-        * Update the theme mod from the value of the parameter.
+        * Update the option from the value of the setting.
         *
         * @since 3.4.0
         *
         * @param mixed $value The value to update.
-        * @return mixed The result of saving the value.
+        * @return bool|null The result of saving the value.
         */
        protected function _update_option( $value ) {
                // Handle non-array option.
@@ -210,13 +366,14 @@ class WP_Customize_Setting {
        }
 
        /**
-        * Fetch the value of the parameter for a specific theme.
+        * Fetch the value of the setting.
         *
         * @since 3.4.0
         *
-        * @return mixed The requested value.
+        * @return mixed The value.
         */
        public function value() {
+               // Get the callback that corresponds to the setting type.
                switch( $this->type ) {
                        case 'theme_mod' :
                                $function = 'get_theme_mod';
@@ -225,6 +382,20 @@ class WP_Customize_Setting {
                                $function = 'get_option';
                                break;
                        default :
+
+                               /**
+                                * Filter a Customize setting value not handled as a theme_mod or option.
+                                *
+                                * The dynamic portion of the hook name, `$this->id_date['base']`, refers to
+                                * the base slug of the setting name.
+                                *
+                                * For settings handled as theme_mods or options, see those corresponding
+                                * functions for available hooks.
+                                *
+                                * @since 3.4.0
+                                *
+                                * @param mixed $default The setting default value. Default empty.
+                                */
                                return apply_filters( 'customize_value_' . $this->id_data[ 'base' ], $this->default );
                }
 
@@ -238,13 +409,24 @@ class WP_Customize_Setting {
        }
 
        /**
-        * Escape the parameter's value for use in JavaScript.
+        * Sanitize the setting's value for use in JavaScript.
         *
         * @since 3.4.0
         *
         * @return mixed The requested escaped value.
         */
        public function js_value() {
+
+               /**
+                * Filter a Customize setting value for use in JavaScript.
+                *
+                * The dynamic portion of the hook name, `$this->id`, refers to the setting ID.
+                *
+                * @since 3.4.0
+                *
+                * @param mixed                $value The setting value.
+                * @param WP_Customize_Setting $this  {@see WP_Customize_Setting} instance.
+                */
                $value = apply_filters( "customize_sanitize_js_{$this->id}", $this->value(), $this );
 
                if ( is_string( $value ) )
@@ -254,13 +436,13 @@ class WP_Customize_Setting {
        }
 
        /**
-        * Check if the theme supports the setting and check user capabilities.
+        * Validate user capabilities whether the theme supports the setting.
         *
         * @since 3.4.0
         *
         * @return bool False if theme doesn't support the setting or user can't change setting, otherwise true.
         */
-       public final function check_capabilities() {
+       final public function check_capabilities() {
                if ( $this->capability && ! call_user_func_array( 'current_user_can', (array) $this->capability ) )
                        return false;
 
@@ -300,8 +482,15 @@ class WP_Customize_Setting {
                        $node = &$node[ $key ];
                }
 
-               if ( $create && ! isset( $node[ $last ] ) )
-                       $node[ $last ] = array();
+               if ( $create ) {
+                       if ( ! is_array( $node ) ) {
+                               // account for an array overriding a string or object value
+                               $node = array();
+                       }
+                       if ( ! isset( $node[ $last ] ) ) {
+                               $node[ $last ] = array();
+                       }
+               }
 
                if ( ! isset( $node[ $last ] ) )
                        return;
@@ -344,7 +533,7 @@ class WP_Customize_Setting {
         *
         * @param $root
         * @param $keys
-        * @param $default A default value which is used as a fallback. Default is null.
+        * @param mixed $default A default value which is used as a fallback. Default is null.
         * @return mixed The requested value or the default value.
         */
        final protected function multidimensional_get( $root, $keys, $default = null ) {
@@ -375,9 +564,9 @@ class WP_Customize_Setting {
  *
  * Results should be properly handled using another setting or callback.
  *
- * @package WordPress
- * @subpackage Customize
  * @since 3.4.0
+ *
+ * @see WP_Customize_Setting
  */
 class WP_Customize_Filter_Setting extends WP_Customize_Setting {
 
@@ -392,9 +581,9 @@ class WP_Customize_Filter_Setting extends WP_Customize_Setting {
  *
  * Results should be properly handled using another setting or callback.
  *
- * @package WordPress
- * @subpackage Customize
  * @since 3.4.0
+ *
+ * @see WP_Customize_Setting
  */
 final class WP_Customize_Header_Image_Setting extends WP_Customize_Setting {
        public $id = 'header_image_data';
@@ -420,16 +609,17 @@ final class WP_Customize_Header_Image_Setting extends WP_Customize_Setting {
 }
 
 /**
- * @package WordPress
- * @subpackage Customize
+ * Customizer Background Image Setting class.
+ *
  * @since 3.4.0
+ *
+ * @see WP_Customize_Setting
  */
 final class WP_Customize_Background_Image_Setting extends WP_Customize_Setting {
        public $id = 'background_image_thumb';
 
        /**
         * @since 3.4.0
-        * @uses remove_theme_mod()
         *
         * @param $value
         */