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<title>[40395] trunk/src: Customize: Auto-expand a widget area section when expanding the Widgets panel if there is only one registered sidebar and it is active.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/40395">40395</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/40395","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>westonruter</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2017-04-07 19:26:31 +0000 (Fri, 07 Apr 2017)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Customize: Auto-expand a widget area section when expanding the Widgets panel if there is only one registered sidebar and it is active.

Introduces `WP_Customize_Panel::$auto_expand_sole_section` property which allows panels to opt-in to the behavior, which the Widgets panel is made to do by default.

Props delawski, westonruter, melchoyce.
Fixes <a href="https://core.trac.wordpress.org/ticket/37471">#37471</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpadmincsscustomizecontrolscss">trunk/src/wp-admin/css/customize-controls.css</a></li>
<li><a href="#trunksrcwpadminjscustomizecontrolsjs">trunk/src/wp-admin/js/customize-controls.js</a></li>
<li><a href="#trunksrcwpincludesclasswpcustomizepanelphp">trunk/src/wp-includes/class-wp-customize-panel.php</a></li>
<li><a href="#trunksrcwpincludesclasswpcustomizewidgetsphp">trunk/src/wp-includes/class-wp-customize-widgets.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpadmincsscustomizecontrolscss"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-admin/css/customize-controls.css</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-admin/css/customize-controls.css     2017-04-07 14:35:39 UTC (rev 40394)
+++ trunk/src/wp-admin/css/customize-controls.css       2017-04-07 19:26:31 UTC (rev 40395)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -303,6 +303,11 @@
</span><span class="cx" style="display: block; padding: 0 10px">        transition: 0.18s transform cubic-bezier(0.645, 0.045, 0.355, 1), 0.18s -webkit-transform cubic-bezier(0.645, 0.045, 0.355, 1); /* easeInOutCubic */
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+#customize-theme-controls .customize-pane-child.skip-transition {
+       -webkit-transition: none;
+       transition: none;
+}
+
</ins><span class="cx" style="display: block; padding: 0 10px"> #customize-info,
</span><span class="cx" style="display: block; padding: 0 10px"> #customize-theme-controls .customize-pane-parent {
</span><span class="cx" style="display: block; padding: 0 10px">        position: relative;
</span></span></pre></div>
<a id="trunksrcwpadminjscustomizecontrolsjs"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-admin/js/customize-controls.js</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-admin/js/customize-controls.js       2017-04-07 14:35:39 UTC (rev 40394)
+++ trunk/src/wp-admin/js/customize-controls.js 2017-04-07 19:26:31 UTC (rev 40395)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -711,11 +711,19 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        var construct = this,
</span><span class="cx" style="display: block; padding: 0 10px">                                content = construct.contentContainer,
</span><span class="cx" style="display: block; padding: 0 10px">                                overlay = content.closest( '.wp-full-overlay' ),
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                elements, transitionEndCallback;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                         elements, transitionEndCallback, transitionParentPane;
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                        // Determine set of elements that are affected by the animation.
</span><span class="cx" style="display: block; padding: 0 10px">                        elements = overlay.add( content );
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        if ( _.isUndefined( construct.panel ) || '' === construct.panel() ) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+                       if ( ! construct.panel || '' === construct.panel() ) {
+                               transitionParentPane = true;
+                       } else if ( api.panel( construct.panel() ).contentContainer.hasClass( 'skip-transition' ) ) {
+                               transitionParentPane = true;
+                       } else {
+                               transitionParentPane = false;
+                       }
+                       if ( transitionParentPane ) {
</ins><span class="cx" style="display: block; padding: 0 10px">                                 elements = elements.add( '#customize-info, .customize-pane-parent' );
</span><span class="cx" style="display: block; padding: 0 10px">                        }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -996,7 +1004,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">                                overlay = section.headContainer.closest( '.wp-full-overlay' ),
</span><span class="cx" style="display: block; padding: 0 10px">                                backBtn = content.find( '.customize-section-back' ),
</span><span class="cx" style="display: block; padding: 0 10px">                                sectionTitle = section.headContainer.find( '.accordion-section-title' ).first(),
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                expand;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                         expand, panel;
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                        if ( expanded && ! content.hasClass( 'open' ) ) {
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1044,6 +1052,12 @@
</span><span class="cx" style="display: block; padding: 0 10px">                                }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                        } else if ( ! expanded && content.hasClass( 'open' ) ) {
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                                if ( section.panel() ) {
+                                       panel = api.panel( section.panel() );
+                                       if ( panel.contentContainer.hasClass( 'skip-transition' ) ) {
+                                               panel.collapse();
+                                       }
+                               }
</ins><span class="cx" style="display: block; padding: 0 10px">                                 section._animateChangeExpanded( function() {
</span><span class="cx" style="display: block; padding: 0 10px">                                        backBtn.attr( 'tabindex', '-1' );
</span><span class="cx" style="display: block; padding: 0 10px">                                        sectionTitle.attr( 'tabindex', '0' );
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1722,7 +1736,9 @@
</span><span class="cx" style="display: block; padding: 0 10px">                                overlay = accordionSection.closest( '.wp-full-overlay' ),
</span><span class="cx" style="display: block; padding: 0 10px">                                container = accordionSection.closest( '.wp-full-overlay-sidebar-content' ),
</span><span class="cx" style="display: block; padding: 0 10px">                                topPanel = panel.headContainer.find( '.accordion-section-title' ),
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                backBtn = accordionSection.find( '.customize-panel-back' );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                         backBtn = accordionSection.find( '.customize-panel-back' ),
+                               childSections = panel.sections(),
+                               skipTransition;
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                        if ( expanded && ! accordionSection.hasClass( 'current-panel' ) ) {
</span><span class="cx" style="display: block; padding: 0 10px">                                // Collapse any sibling sections/panels
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1737,35 +1753,50 @@
</span><span class="cx" style="display: block; padding: 0 10px">                                        }
</span><span class="cx" style="display: block; padding: 0 10px">                                });
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                panel._animateChangeExpanded( function() {
-                                       topPanel.attr( 'tabindex', '-1' );
-                                       backBtn.attr( 'tabindex', '0' );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                         if ( panel.params.autoExpandSoleSection && 1 === childSections.length && childSections[0].active.get() ) {
+                                       accordionSection.addClass( 'current-panel skip-transition' );
+                                       overlay.addClass( 'in-sub-panel' );
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                        backBtn.focus();
-                                       accordionSection.css( 'top', '' );
-                                       container.scrollTop( 0 );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                                 childSections[0].expand( {
+                                               completeCallback: args.completeCallback
+                                       } );
+                               } else {
+                                       panel._animateChangeExpanded( function() {
+                                               topPanel.attr( 'tabindex', '-1' );
+                                               backBtn.attr( 'tabindex', '0' );
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                        if ( args.completeCallback ) {
-                                               args.completeCallback();
-                                       }
-                               } );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                                         backBtn.focus();
+                                               accordionSection.css( 'top', '' );
+                                               container.scrollTop( 0 );
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                overlay.addClass( 'in-sub-panel' );
-                               accordionSection.addClass( 'current-panel' );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                                         if ( args.completeCallback ) {
+                                                       args.completeCallback();
+                                               }
+                                       } );
+
+                                       accordionSection.addClass( 'current-panel' );
+                                       overlay.addClass( 'in-sub-panel' );
+                               }
+
</ins><span class="cx" style="display: block; padding: 0 10px">                                 api.state( 'expandedPanel' ).set( panel );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                        } else if ( ! expanded && accordionSection.hasClass( 'current-panel' ) ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                panel._animateChangeExpanded( function() {
-                                       topPanel.attr( 'tabindex', '0' );
-                                       backBtn.attr( 'tabindex', '-1' );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                         skipTransition = accordionSection.hasClass( 'skip-transition' );
+                               if ( ! skipTransition ) {
+                                       panel._animateChangeExpanded( function() {
+                                               topPanel.attr( 'tabindex', '0' );
+                                               backBtn.attr( 'tabindex', '-1' );
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                        topPanel.focus();
-                                       accordionSection.css( 'top', '' );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                                         topPanel.focus();
+                                               accordionSection.css( 'top', '' );
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                        if ( args.completeCallback ) {
-                                               args.completeCallback();
-                                       }
-                               } );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                                         if ( args.completeCallback ) {
+                                                       args.completeCallback();
+                                               }
+                                       } );
+                               } else {
+                                       accordionSection.removeClass( 'skip-transition' );
+                               }
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                                overlay.removeClass( 'in-sub-panel' );
</span><span class="cx" style="display: block; padding: 0 10px">                                accordionSection.removeClass( 'current-panel' );
</span></span></pre></div>
<a id="trunksrcwpincludesclasswpcustomizepanelphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/class-wp-customize-panel.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/class-wp-customize-panel.php        2017-04-07 14:35:39 UTC (rev 40394)
+++ trunk/src/wp-includes/class-wp-customize-panel.php  2017-04-07 19:26:31 UTC (rev 40395)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -104,6 +104,15 @@
</span><span class="cx" style="display: block; padding: 0 10px">        public $description = '';
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        /**
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         * Auto-expand a section in a panel when the panel is expanded when the panel only has the one section.
+        *
+        * @since 4.7.4
+        * @access public
+        * @var bool
+        */
+       public $auto_expand_sole_section = false;
+
+       /**
</ins><span class="cx" style="display: block; padding: 0 10px">          * Customizer sections for this panel.
</span><span class="cx" style="display: block; padding: 0 10px">         *
</span><span class="cx" style="display: block; padding: 0 10px">         * @since 4.0.0
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -219,6 +228,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">                $array['content'] = $this->get_content();
</span><span class="cx" style="display: block; padding: 0 10px">                $array['active'] = $this->active();
</span><span class="cx" style="display: block; padding: 0 10px">                $array['instanceNumber'] = $this->instance_number;
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                $array['autoExpandSoleSection'] = $this->auto_expand_sole_section;
</ins><span class="cx" style="display: block; padding: 0 10px">                 return $array;
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span></span></pre></div>
<a id="trunksrcwpincludesclasswpcustomizewidgetsphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/class-wp-customize-widgets.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/class-wp-customize-widgets.php      2017-04-07 14:35:39 UTC (rev 40394)
+++ trunk/src/wp-includes/class-wp-customize-widgets.php        2017-04-07 19:26:31 UTC (rev 40395)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -422,6 +422,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        'description'     => __( 'Widgets are independent sections of content that can be placed into widgetized areas provided by your theme (commonly called sidebars).' ),
</span><span class="cx" style="display: block; padding: 0 10px">                        'priority'        => 110,
</span><span class="cx" style="display: block; padding: 0 10px">                        'active_callback' => array( $this, 'is_panel_active' ),
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                        'auto_expand_sole_section' => true,
</ins><span class="cx" style="display: block; padding: 0 10px">                 ) );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                foreach ( $sidebars_widgets as $sidebar_id => $sidebar_widget_ids ) {
</span></span></pre>
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