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<title>[29051] trunk/src: Customizer: Introduce WP_Customize_Control::active() method to determine whether the control is relevant to the current context (i.e.</title>
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<div id="msg">
<dl class="meta">
<dt>Revision</dt> <dd><a href="http://core.trac.wordpress.org/changeset/29051">29051</a></dd>
<dt>Author</dt> <dd>SergeyBiryukov</dd>
<dt>Date</dt> <dd>2014-07-09 23:57:29 +0000 (Wed, 09 Jul 2014)</dd>
</dl>

<h3>Log Message</h3>
<pre>Customizer: Introduce WP_Customize_Control::active() method to determine whether the control is relevant to the current context (i.e. to the current URL being previewed).

Control can indicate its active state by a subclass overriding the 'active_callback' method, by supplying a callable 'active_callback' argument into the control's constructor, or by filtering 'customize_control_active'.

props westonruter.
see <a href="http://core.trac.wordpress.org/ticket/27993">#27993</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpadminjscustomizecontrolsjs">trunk/src/wp-admin/js/customize-controls.js</a></li>
<li><a href="#trunksrcwpadminjscustomizewidgetsjs">trunk/src/wp-admin/js/customize-widgets.js</a></li>
<li><a href="#trunksrcwpincludesclasswpcustomizecontrolphp">trunk/src/wp-includes/class-wp-customize-control.php</a></li>
<li><a href="#trunksrcwpincludesclasswpcustomizemanagerphp">trunk/src/wp-includes/class-wp-customize-manager.php</a></li>
<li><a href="#trunksrcwpincludesclasswpcustomizewidgetsphp">trunk/src/wp-includes/class-wp-customize-widgets.php</a></li>
<li><a href="#trunksrcwpincludesjscustomizepreviewwidgetsjs">trunk/src/wp-includes/js/customize-preview-widgets.js</a></li>
<li><a href="#trunksrcwpincludesjscustomizepreviewjs">trunk/src/wp-includes/js/customize-preview.js</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpadminjscustomizecontrolsjs"></a>
<div class="modfile"><h4>Modified: trunk/src/wp-admin/js/customize-controls.js (29050 => 29051)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/src/wp-admin/js/customize-controls.js      2014-07-09 22:42:28 UTC (rev 29050)
+++ trunk/src/wp-admin/js/customize-controls.js 2014-07-09 23:57:29 UTC (rev 29051)
</span><span class="lines">@@ -37,6 +37,7 @@
</span><span class="cx">                  this.id = id;
</span><span class="cx">                  this.selector = '#customize-control-' + id.replace( /\]/g, '' ).replace( /\[/g, '-' );
</span><span class="cx">                  this.container = $( this.selector );
</span><ins>+                       this.active = new api.Value( this.params.active );
</ins><span class="cx"> 
</span><span class="cx">                  settings = $.map( this.params.settings, function( value ) {
</span><span class="cx">                          return value;
</span><span class="lines">@@ -79,10 +80,30 @@
</span><span class="cx">                                  element.set( setting() );
</span><span class="cx">                          });
</span><span class="cx">                  });
</span><ins>+
+                       control.active.bind( function ( active ) {
+                               control.toggle( active );
+                       } );
+                       control.toggle( control.active() );
</ins><span class="cx">           },
</span><span class="cx"> 
</span><span class="cx">          ready: function() {},
</span><span class="cx"> 
</span><ins>+               /**
+                * Callback for change to the control's active state.
+                *
+                * Override function for custom behavior for the control being active/inactive.
+                *
+                * @param {Boolean} active
+                */
+               toggle: function ( active ) {
+                       if ( active ) {
+                               this.container.slideDown();
+                       } else {
+                               this.container.slideUp();
+                       }
+               },
+
</ins><span class="cx">           dropdownInit: function() {
</span><span class="cx">                  var control      = this,
</span><span class="cx">                          statuses     = this.container.find('.dropdown-status'),
</span><span class="lines">@@ -563,6 +584,26 @@
</span><span class="cx"> 
</span><span class="cx">                  this.bind( 'ready', this._ready );
</span><span class="cx"> 
</span><ins>+                       this.bind( 'ready', function ( data ) {
+                               if ( ! data || ! data.activeControls ) {
+                                       return;
+                               }
+
+                               // Any controls not even registered on the previewed URL are not active either
+                               api.control.each( function ( control ) {
+                                       if ( typeof data.activeControls[ control.id ] === 'undefined' ) {
+                                               data.activeControls[ control.id ] = false;
+                                       }
+                               } );
+
+                               $.each( data.activeControls, function ( id, active ) {
+                                       var control = api.control( id );
+                                       if ( control ) {
+                                               control.active( active );
+                                       }
+                               } );
+                       } );
+
</ins><span class="cx">                   this.request = $.ajax( this.previewUrl(), {
</span><span class="cx">                          type: 'POST',
</span><span class="cx">                          data: this.query,
</span></span></pre></div>
<a id="trunksrcwpadminjscustomizewidgetsjs"></a>
<div class="modfile"><h4>Modified: trunk/src/wp-admin/js/customize-widgets.js (29050 => 29051)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/src/wp-admin/js/customize-widgets.js       2014-07-09 22:42:28 UTC (rev 29050)
+++ trunk/src/wp-admin/js/customize-widgets.js  2014-07-09 23:57:29 UTC (rev 29051)
</span><span class="lines">@@ -751,13 +751,6 @@
</span><span class="cx">                          }
</span><span class="cx">                  } );
</span><span class="cx"> 
</span><del>-                       // Update widget control to indicate whether it is currently rendered
-                       api.previewer.bind( 'rendered-widgets', function( renderedWidgets ) {
-                               var isRendered = !! renderedWidgets[self.params.widget_id];
-
-                               self.container.toggleClass( 'widget-rendered', isRendered );
-                       } );
-
</del><span class="cx">                   formSyncHandler = api.Widgets.formSyncHandlers[ this.params.widget_id_base ];
</span><span class="cx">                  if ( formSyncHandler ) {
</span><span class="cx">                          $( document ).on( 'widget-synced', function( e, widget ) {
</span><span class="lines">@@ -769,6 +762,17 @@
</span><span class="cx">          },
</span><span class="cx"> 
</span><span class="cx">          /**
</span><ins>+                * Update widget control to indicate whether it is currently rendered.
+                *
+                * Overrides api.Control.toggle()
+                *
+                * @param {Boolean} active
+                */
+               toggle: function ( active ) {
+                       this.container.toggleClass( 'widget-rendered', active );
+               },
+
+               /**
</ins><span class="cx">            * Set up event handlers for widget removal
</span><span class="cx">           */
</span><span class="cx">          _setupRemoveUI: function() {
</span><span class="lines">@@ -1418,32 +1422,38 @@
</span><span class="cx">                  } );
</span><span class="cx"> 
</span><span class="cx">                  // Update the model with whether or not the sidebar is rendered
</span><del>-                       api.previewer.bind( 'rendered-sidebars', function( renderedSidebars ) {
-                               var isRendered = !! renderedSidebars[self.params.sidebar_id];
-
-                               registeredSidebar.set( 'is_rendered', isRendered );
</del><ins>+                        self.active.bind( function ( active ) {
+                               registeredSidebar.set( 'is_rendered', active );
</ins><span class="cx">                   } );
</span><ins>+               },
</ins><span class="cx"> 
</span><del>-                       // Show the sidebar section when it becomes visible
-                       registeredSidebar.on( 'change:is_rendered', function( ) {
-                               var sectionSelector = '#accordion-section-sidebar-widgets-' + this.get( 'id' ), $section;
</del><ins>+                /**
+                * Show the sidebar section when it becomes visible.
+                *
+                * Overrides api.Control.toggle()
+                *
+                * @param {Boolean} active
+                */
+               toggle: function ( active ) {
+                       var $section, sectionSelector;
</ins><span class="cx"> 
</span><del>-                               $section = $( sectionSelector );
-                               if ( this.get( 'is_rendered' ) ) {
-                                       $section.stop().slideDown( function() {
-                                               $( this ).css( 'height', 'auto' ); // so that the .accordion-section-content won't overflow
-                                       } );
</del><ins>+                        sectionSelector = '#accordion-section-sidebar-widgets-' + this.params.sidebar_id;
+                       $section = $( sectionSelector );
</ins><span class="cx"> 
</span><del>-                               } else {
-                                       // Make sure that hidden sections get closed first
-                                       if ( $section.hasClass( 'open' ) ) {
-                                               // it would be nice if accordionSwitch() in accordion.js was public
-                                               $section.find( '.accordion-section-title' ).trigger( 'click' );
-                                       }
</del><ins>+                        if ( active ) {
+                               $section.stop().slideDown( function() {
+                                       $( this ).css( 'height', 'auto' ); // so that the .accordion-section-content won't overflow
+                               } );
</ins><span class="cx"> 
</span><del>-                                       $section.stop().slideUp();
</del><ins>+                        } else {
+                               // Make sure that hidden sections get closed first
+                               if ( $section.hasClass( 'open' ) ) {
+                                       // it would be nice if accordionSwitch() in accordion.js was public
+                                       $section.find( '.accordion-section-title' ).trigger( 'click' );
</ins><span class="cx">                           }
</span><del>-                       } );
</del><ins>+
+                               $section.stop().slideUp();
+                       }
</ins><span class="cx">           },
</span><span class="cx"> 
</span><span class="cx">          /**
</span></span></pre></div>
<a id="trunksrcwpincludesclasswpcustomizecontrolphp"></a>
<div class="modfile"><h4>Modified: trunk/src/wp-includes/class-wp-customize-control.php (29050 => 29051)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/src/wp-includes/class-wp-customize-control.php     2014-07-09 22:42:28 UTC (rev 29050)
+++ trunk/src/wp-includes/class-wp-customize-control.php        2014-07-09 23:57:29 UTC (rev 29051)
</span><span class="lines">@@ -85,6 +85,19 @@
</span><span class="cx">   */
</span><span class="cx">  public $type = 'text';
</span><span class="cx"> 
</span><ins>+       /**
+        * Callback
+        *
+        * @since 4.0.0
+        *
+        * @access public
+        * @see WP_Customize_Control::active()
+        * @var callable  Callback is called with one argument, the instance of
+        *                WP_Customize_Control, and returns bool to indicate whether
+        *                the control is active (such as it relates to the URL
+        *                currently being previewed).
+        */
+       public $active_callback = '';
</ins><span class="cx"> 
</span><span class="cx">  /**
</span><span class="cx">   * Constructor.
</span><span class="lines">@@ -102,16 +115,21 @@
</span><span class="cx">  public function __construct( $manager, $id, $args = array() ) {
</span><span class="cx">          $keys = array_keys( get_object_vars( $this ) );
</span><span class="cx">          foreach ( $keys as $key ) {
</span><del>-                       if ( isset( $args[ $key ] ) )
</del><ins>+                        if ( isset( $args[ $key ] ) ) {
</ins><span class="cx">                           $this->$key = $args[ $key ];
</span><ins>+                       }
</ins><span class="cx">           }
</span><span class="cx"> 
</span><span class="cx">          $this->manager = $manager;
</span><span class="cx">          $this->id = $id;
</span><ins>+               if ( empty( $this->active_callback ) ) {
+                       $this->active_callback = array( $this, 'active_callback' );
+               }
</ins><span class="cx"> 
</span><span class="cx">          // Process settings.
</span><del>-               if ( empty( $this->settings ) )
</del><ins>+                if ( empty( $this->settings ) ) {
</ins><span class="cx">                   $this->settings = $id;
</span><ins>+               }
</ins><span class="cx"> 
</span><span class="cx">          $settings = array();
</span><span class="cx">          if ( is_array( $this->settings ) ) {
</span><span class="lines">@@ -132,8 +150,43 @@
</span><span class="cx">   */
</span><span class="cx">  public function enqueue() {}
</span><span class="cx"> 
</span><ins>+       /**
+        * Check whether control is active to current customizer preview.
+        *
+        * @since 4.0.0
+        *
+        * @return bool
+        */
+       public final function active() {
+               $control = $this;
+               $active = call_user_func( $this->active_callback, $this );
</ins><span class="cx"> 
</span><ins>+               /**
+                * Filter response of WP_Customize_Control::active().
+                *
+                * @since 4.0.0
+                *
+                * @param bool $active
+                * @param WP_Customize_Control $control
+                */
+               $active = apply_filters( 'customize_control_active', $active, $control );
+
+               return $active;
+       }
+
</ins><span class="cx">   /**
</span><ins>+        * Default callback used when invoking WP_Customize_Control::active().
+        *
+        * Subclasses can override this with their specific logic, or they may
+        * provide an 'active_callback' argument to the constructor.
+        *
+        * @return bool
+        */
+       public function active_callback() {
+               return true;
+       }
+
+       /**
</ins><span class="cx">    * Fetch a setting's value.
</span><span class="cx">   * Grabs the main setting by default.
</span><span class="cx">   *
</span><span class="lines">@@ -143,8 +196,9 @@
</span><span class="cx">   * @return mixed The requested setting's value, if the setting exists.
</span><span class="cx">   */
</span><span class="cx">  public final function value( $setting_key = 'default' ) {
</span><del>-               if ( isset( $this->settings[ $setting_key ] ) )
</del><ins>+                if ( isset( $this->settings[ $setting_key ] ) ) {
</ins><span class="cx">                   return $this->settings[ $setting_key ]->value();
</span><ins>+               }
</ins><span class="cx">   }
</span><span class="cx"> 
</span><span class="cx">  /**
</span><span class="lines">@@ -159,6 +213,7 @@
</span><span class="cx">          }
</span><span class="cx"> 
</span><span class="cx">          $this->json['type'] = $this->type;
</span><ins>+               $this->json['active'] = $this->active();
</ins><span class="cx">   }
</span><span class="cx"> 
</span><span class="cx">  /**
</span><span class="lines">@@ -256,7 +311,7 @@
</span><span class="cx">          echo $this->get_link( $setting_key );
</span><span class="cx">  }
</span><span class="cx"> 
</span><del>-       /**
</del><ins>+        /**
</ins><span class="cx">    * Render the custom attributes for the control's input element.
</span><span class="cx">   *
</span><span class="cx">   * @since 4.0.0
</span><span class="lines">@@ -995,6 +1050,13 @@
</span><span class="cx">          </span>
</span><span class="cx">          <?php
</span><span class="cx">  }
</span><ins>+
+       /**
+        * @return bool
+        */
+       function active_callback() {
+               return $this->manager->widgets->is_sidebar_rendered( $this->sidebar_id );
+       }
</ins><span class="cx"> }
</span><span class="cx"> 
</span><span class="cx"> /**
</span><span class="lines">@@ -1035,5 +1097,12 @@
</span><span class="cx">          $args = wp_list_widget_controls_dynamic_sidebar( array( 0 => $args, 1 => $widget['params'][0] ) );
</span><span class="cx">          echo $this->manager->widgets->get_widget_control( $args );
</span><span class="cx">  }
</span><ins>+
+       /**
+        * @return bool
+        */
+       function active_callback() {
+               return $this->manager->widgets->is_widget_rendered( $this->widget_id );
+       }
</ins><span class="cx"> }
</span><span class="cx"> 
</span></span></pre></div>
<a id="trunksrcwpincludesclasswpcustomizemanagerphp"></a>
<div class="modfile"><h4>Modified: trunk/src/wp-includes/class-wp-customize-manager.php (29050 => 29051)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/src/wp-includes/class-wp-customize-manager.php     2014-07-09 22:42:28 UTC (rev 29050)
+++ trunk/src/wp-includes/class-wp-customize-manager.php        2014-07-09 23:57:29 UTC (rev 29051)
</span><span class="lines">@@ -475,7 +475,8 @@
</span><span class="cx">  public function customize_preview_settings() {
</span><span class="cx">          $settings = array(
</span><span class="cx">                  'values'  => array(),
</span><del>-                       'channel' => esc_js( $_POST['customize_messenger_channel'] ),
</del><ins>+                        'channel' => wp_unslash( $_POST['customize_messenger_channel'] ),
+                       'activeControls' => array(),
</ins><span class="cx">           );
</span><span class="cx"> 
</span><span class="cx">          if ( 2 == $this->nonce_tick ) {
</span><span class="lines">@@ -488,6 +489,9 @@
</span><span class="cx">          foreach ( $this->settings as $id => $setting ) {
</span><span class="cx">                  $settings['values'][ $id ] = $setting->js_value();
</span><span class="cx">          }
</span><ins>+               foreach ( $this->controls as $id => $control ) {
+                       $settings['activeControls'][ $id ] = $control->active();
+               }
</ins><span class="cx"> 
</span><span class="cx">          ?>
</span><span class="cx">          <script type="text/javascript">
</span></span></pre></div>
<a id="trunksrcwpincludesclasswpcustomizewidgetsphp"></a>
<div class="modfile"><h4>Modified: trunk/src/wp-includes/class-wp-customize-widgets.php (29050 => 29051)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/src/wp-includes/class-wp-customize-widgets.php     2014-07-09 22:42:28 UTC (rev 29050)
+++ trunk/src/wp-includes/class-wp-customize-widgets.php        2014-07-09 23:57:29 UTC (rev 29051)
</span><span class="lines">@@ -1068,10 +1068,36 @@
</span><span class="cx">   * @param array $widget Rendered widget to tally.
</span><span class="cx">   */
</span><span class="cx">  public function tally_rendered_widgets( $widget ) {
</span><del>-               $this->rendered_widgets[$widget['id']] = true;
</del><ins>+                $this->rendered_widgets[ $widget['id'] ] = true;
</ins><span class="cx">   }
</span><span class="cx"> 
</span><span class="cx">  /**
</span><ins>+        * Determine if a widget is rendered on the page.
+        *
+        * @since 4.0.0
+        * @access public
+        *
+        * @param string $widget_id
+        * @return bool
+        */
+       public function is_widget_rendered( $widget_id ) {
+               return in_array( $widget_id, $this->rendered_widgets );
+       }
+
+       /**
+        * Determine if a sidebar is rendered on the page.
+        *
+        * @since 4.0.0
+        * @access public
+        *
+        * @param string $sidebar_id
+        * @return bool
+        */
+       public function is_sidebar_rendered( $sidebar_id ) {
+               return in_array( $sidebar_id, $this->rendered_sidebars );
+       }
+
+       /**
</ins><span class="cx">    * Tally the sidebars rendered via is_active_sidebar().
</span><span class="cx">   *
</span><span class="cx">   * Keep track of the times that is_active_sidebar() is called
</span></span></pre></div>
<a id="trunksrcwpincludesjscustomizepreviewwidgetsjs"></a>
<div class="modfile"><h4>Modified: trunk/src/wp-includes/js/customize-preview-widgets.js (29050 => 29051)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/src/wp-includes/js/customize-preview-widgets.js    2014-07-09 22:42:28 UTC (rev 29050)
+++ trunk/src/wp-includes/js/customize-preview-widgets.js       2014-07-09 23:57:29 UTC (rev 29051)
</span><span class="lines">@@ -23,11 +23,6 @@
</span><span class="cx">                  this.buildWidgetSelectors();
</span><span class="cx">                  this.highlightControls();
</span><span class="cx"> 
</span><del>-                       this.preview.bind( 'active', function() {
-                               self.preview.send( 'rendered-sidebars', self.renderedSidebars ); // @todo Only send array of IDs
-                               self.preview.send( 'rendered-widgets', self.renderedWidgets ); // @todo Only send array of IDs
-                       } );
-
</del><span class="cx">                   this.preview.bind( 'highlight-widget', self.highlightWidget );
</span><span class="cx">          },
</span><span class="cx"> 
</span></span></pre></div>
<a id="trunksrcwpincludesjscustomizepreviewjs"></a>
<div class="modfile"><h4>Modified: trunk/src/wp-includes/js/customize-preview.js (29050 => 29051)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/src/wp-includes/js/customize-preview.js    2014-07-09 22:42:28 UTC (rev 29050)
+++ trunk/src/wp-includes/js/customize-preview.js       2014-07-09 23:57:29 UTC (rev 29051)
</span><span class="lines">@@ -95,7 +95,9 @@
</span><span class="cx">                 preview.send( 'nonce', api.settings.nonce );
</span><span class="cx">         });
</span><span class="cx"> 
</span><del>-               preview.send( 'ready' );
</del><ins>+                preview.send( 'ready', {
+                       activeControls: api.settings.activeControls
+               } );
</ins><span class="cx"> 
</span><span class="cx">          /* Custom Backgrounds */
</span><span class="cx">          bg = $.map(['color', 'image', 'position_x', 'repeat', 'attachment'], function( prop ) {
</span></span></pre>
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