]> scripts.mit.edu Git - autoinstalls/wordpress.git/blobdiff - wp-admin/js/customize-widgets.js
WordPress 4.7-scripts
[autoinstalls/wordpress.git] / wp-admin / js / customize-widgets.js
index f5c4328d01708c69d36a470639ecc731aadc9eee..25c1eb5b7a6274af7ad7c251c1c933530eeb7ba2 100644 (file)
@@ -8,6 +8,7 @@
                l10n;
 
        api.Widgets = api.Widgets || {};
+       api.Widgets.savedWidgetIds = {};
 
        // Link settings
        api.Widgets.data = _wpCustomizeWidgetsSettings || {};
@@ -33,7 +34,7 @@
                multi_number: null,
                name: null,
                id_base: null,
-               transport: 'refresh',
+               transport: null,
                params: [],
                width: null,
                height: null,
@@ -69,8 +70,7 @@
                                this.search( this.terms );
                        }
 
-                       // If search is blank, show all themes
-                       // Useful for resetting the views when you clean the input
+                       // If search is blank, set all the widgets as they matched the search to reset the views.
                        if ( this.terms === '' ) {
                                this.each( function ( widget ) {
                                        widget.set( 'search_matched', true );
                events: {
                        'input #widgets-search': 'search',
                        'keyup #widgets-search': 'search',
-                       'change #widgets-search': 'search',
-                       'search #widgets-search': 'search',
                        'focus .widget-tpl' : 'focus',
                        'click .widget-tpl' : '_submit',
                        'keypress .widget-tpl' : '_submit',
                // Cache sidebar control which has opened panel
                currentSidebarControl: null,
                $search: null,
+               $clearResults: null,
+               searchMatchesCount: null,
 
                initialize: function() {
                        var self = this;
 
                        this.$search = $( '#widgets-search' );
 
+                       this.$clearResults = this.$el.find( '.clear-results' );
+
                        _.bindAll( this, 'close' );
 
                        this.listenTo( this.collection, 'change', this.updateList );
 
                        this.updateList();
 
+                       // Set the initial search count to the number of available widgets.
+                       this.searchMatchesCount = this.collection.length;
+
                        // If the available widgets panel is open and the customize controls are
                        // interacted with (i.e. available widgets panel is blurred) then close the
-                       // available widgets panel.
-                       $( '#customize-controls' ).on( 'click keydown', function( e ) {
+                       // available widgets panel. Also close on back button click.
+                       $( '#customize-controls, #available-widgets .customize-section-title' ).on( 'click keydown', function( e ) {
                                var isAddNewBtn = $( e.target ).is( '.add-new-widget, .add-new-widget *' );
                                if ( $( 'body' ).hasClass( 'adding-widget' ) && ! isAddNewBtn ) {
                                        self.close();
                                }
                        } );
 
+                       // Clear the search results and trigger a `keyup` event to fire a new search.
+                       this.$clearResults.on( 'click', function() {
+                               self.$search.val( '' ).focus().trigger( 'keyup' );
+                       } );
+
                        // Close the panel if the URL in the preview changes
                        api.previewer.bind( 'url', this.close );
                },
                        var firstVisible;
 
                        this.collection.doSearch( event.target.value );
+                       // Update the search matches count.
+                       this.updateSearchMatchesCount();
+                       // Announce how many search results.
+                       this.announceSearchMatches();
 
                        // Remove a widget from being selected if it is no longer visible
                        if ( this.selected && ! this.selected.is( ':visible' ) ) {
                                        this.select( firstVisible );
                                }
                        }
+
+                       // Toggle the clear search results button.
+                       if ( '' !== event.target.value ) {
+                               this.$clearResults.addClass( 'is-visible' );
+                       } else if ( '' === event.target.value ) {
+                               this.$clearResults.removeClass( 'is-visible' );
+                       }
+
+                       // Set a CSS class on the search container when there are no search results.
+                       if ( ! this.searchMatchesCount ) {
+                               this.$el.addClass( 'no-widgets-found' );
+                       } else {
+                               this.$el.removeClass( 'no-widgets-found' );
+                       }
+               },
+
+               // Update the count of the available widgets that have the `search_matched` attribute.
+               updateSearchMatchesCount: function() {
+                       this.searchMatchesCount = this.collection.where({ search_matched: true }).length;
                },
 
+               // Send a message to the aria-live region to announce how many search results.
+               announceSearchMatches: _.debounce( function() {
+                       var message = l10n.widgetsFound.replace( '%d', this.searchMatchesCount ) ;
+
+                       if ( ! this.searchMatchesCount ) {
+                               message = l10n.noWidgetsFound;
+                       }
+
+                       wp.a11y.speak( message );
+               }, 500 ),
+
                // Changes visibility of available widgets
                updateList: function() {
                        this.collection.each( function( widget ) {
 
                // Adds a selected widget to the sidebar
                submit: function( widgetTpl ) {
-                       var widgetId, widget;
+                       var widgetId, widget, widgetFormControl;
 
                        if ( ! widgetTpl ) {
                                widgetTpl = this.selected;
                                return;
                        }
 
-                       this.currentSidebarControl.addWidget( widget.get( 'id_base' ) );
+                       widgetFormControl = this.currentSidebarControl.addWidget( widget.get( 'id_base' ) );
+                       if ( widgetFormControl ) {
+                               widgetFormControl.focus();
+                       }
 
                        this.close();
                },
                        // Reset search
                        this.collection.doSearch( '' );
 
-                       this.$search.focus();
+                       if ( ! api.settings.browser.mobile ) {
+                               this.$search.focus();
+                       }
                },
 
                // Closes the panel
                                this.close( { returnFocus: true } );
                        }
 
-                       if ( isTab && ( isShift && isSearchFocused || ! isShift && isLastWidgetFocused ) ) {
+                       if ( this.currentSidebarControl && isTab && ( isShift && isSearchFocused || ! isShift && isLastWidgetFocused ) ) {
                                this.currentSidebarControl.container.find( '.add-new-widget' ).focus();
                                event.preventDefault();
                        }
                /**
                 * @since 4.1.0
                 */
-               initialize: function ( id, options ) {
+               initialize: function( id, options ) {
                        var control = this;
-                       api.Control.prototype.initialize.call( control, id, options );
-                       control.expanded = new api.Value();
+
+                       control.widgetControlEmbedded = false;
+                       control.widgetContentEmbedded = false;
+                       control.expanded = new api.Value( false );
                        control.expandedArgumentsQueue = [];
-                       control.expanded.bind( function ( expanded ) {
+                       control.expanded.bind( function( expanded ) {
                                var args = control.expandedArgumentsQueue.shift();
                                args = $.extend( {}, control.defaultExpandedArguments, args );
                                control.onChangeExpanded( expanded, args );
                        });
-                       control.expanded.set( false );
+                       control.altNotice = true;
+
+                       api.Control.prototype.initialize.call( control, id, options );
                },
 
                /**
-                * Set up the control
+                * Set up the control.
+                *
+                * @since 3.9.0
                 */
                ready: function() {
-                       this._setupModel();
-                       this._setupWideWidget();
-                       this._setupControlToggle();
-                       this._setupWidgetTitle();
-                       this._setupReorderUI();
-                       this._setupHighlightEffects();
-                       this._setupUpdateUI();
-                       this._setupRemoveUI();
+                       var control = this;
+
+                       /*
+                        * Embed a placeholder once the section is expanded. The full widget
+                        * form content will be embedded once the control itself is expanded,
+                        * and at this point the widget-added event will be triggered.
+                        */
+                       if ( ! control.section() ) {
+                               control.embedWidgetControl();
+                       } else {
+                               api.section( control.section(), function( section ) {
+                                       var onExpanded = function( isExpanded ) {
+                                               if ( isExpanded ) {
+                                                       control.embedWidgetControl();
+                                                       section.expanded.unbind( onExpanded );
+                                               }
+                                       };
+                                       if ( section.expanded() ) {
+                                               onExpanded( true );
+                                       } else {
+                                               section.expanded.bind( onExpanded );
+                                       }
+                               } );
+                       }
+               },
+
+               /**
+                * Embed the .widget element inside the li container.
+                *
+                * @since 4.4.0
+                */
+               embedWidgetControl: function() {
+                       var control = this, widgetControl;
+
+                       if ( control.widgetControlEmbedded ) {
+                               return;
+                       }
+                       control.widgetControlEmbedded = true;
+
+                       widgetControl = $( control.params.widget_control );
+                       control.container.append( widgetControl );
+
+                       control._setupModel();
+                       control._setupWideWidget();
+                       control._setupControlToggle();
+
+                       control._setupWidgetTitle();
+                       control._setupReorderUI();
+                       control._setupHighlightEffects();
+                       control._setupUpdateUI();
+                       control._setupRemoveUI();
+               },
+
+               /**
+                * Embed the actual widget form inside of .widget-content and finally trigger the widget-added event.
+                *
+                * @since 4.4.0
+                */
+               embedWidgetContent: function() {
+                       var control = this, widgetContent;
+
+                       control.embedWidgetControl();
+                       if ( control.widgetContentEmbedded ) {
+                               return;
+                       }
+                       control.widgetContentEmbedded = true;
+
+                       widgetContent = $( control.params.widget_content );
+                       control.container.find( '.widget-content:first' ).append( widgetContent );
 
                        /*
                         * Trigger widget-added event so that plugins can attach any event
                         * listeners and dynamic UI elements.
                         */
-                       $( document ).trigger( 'widget-added', [ this.container.find( '.widget:first' ) ] );
+                       $( document ).trigger( 'widget-added', [ control.container.find( '.widget:first' ) ] );
+
                },
 
                /**
                _setupModel: function() {
                        var self = this, rememberSavedWidgetId;
 
-                       api.Widgets.savedWidgetIds = api.Widgets.savedWidgetIds || [];
-
                        // Remember saved widgets so we know which to trash (move to inactive widgets sidebar)
                        rememberSavedWidgetId = function() {
                                api.Widgets.savedWidgetIds[self.params.widget_id] = true;
                 */
                _setupReorderUI: function() {
                        var self = this, selectSidebarItem, $moveWidgetArea,
-                               $reorderNav, updateAvailableSidebars;
+                               $reorderNav, updateAvailableSidebars, template;
 
                        /**
                         * select the provided sidebar list item in the move widget area
                         * Add the widget reordering elements to the widget control
                         */
                        this.container.find( '.widget-title-action' ).after( $( api.Widgets.data.tpl.widgetReorderNav ) );
-                       $moveWidgetArea = $(
-                               _.template( api.Widgets.data.tpl.moveWidgetArea, {
+
+
+                       template = _.template( api.Widgets.data.tpl.moveWidgetArea );
+                       $moveWidgetArea = $( template( {
                                        sidebars: _( api.Widgets.registeredSidebars.toArray() ).pluck( 'attributes' )
                                } )
                        );
                         * Update available sidebars when their rendered state changes
                         */
                        updateAvailableSidebars = function() {
-                               var $sidebarItems = $moveWidgetArea.find( 'li' ), selfSidebarItem;
+                               var $sidebarItems = $moveWidgetArea.find( 'li' ), selfSidebarItem,
+                                       renderedSidebarCount = 0;
 
                                selfSidebarItem = $sidebarItems.filter( function(){
                                        return $( this ).data( 'id' ) === self.params.sidebar_id;
 
                                $sidebarItems.each( function() {
                                        var li = $( this ),
-                                               sidebarId,
-                                               sidebar;
+                                               sidebarId, sidebar, sidebarIsRendered;
 
                                        sidebarId = li.data( 'id' );
                                        sidebar = api.Widgets.registeredSidebars.get( sidebarId );
+                                       sidebarIsRendered = sidebar.get( 'is_rendered' );
 
-                                       li.toggle( sidebar.get( 'is_rendered' ) );
+                                       li.toggle( sidebarIsRendered );
 
-                                       if ( li.hasClass( 'selected' ) && ! sidebar.get( 'is_rendered' ) ) {
+                                       if ( sidebarIsRendered ) {
+                                               renderedSidebarCount += 1;
+                                       }
+
+                                       if ( li.hasClass( 'selected' ) && ! sidebarIsRendered ) {
                                                selectSidebarItem( selfSidebarItem );
                                        }
                                } );
+
+                               if ( renderedSidebarCount > 1 ) {
+                                       self.container.find( '.move-widget' ).show();
+                               } else {
+                                       self.container.find( '.move-widget' ).hide();
+                               }
                        };
 
                        updateAvailableSidebars();
 
                                        if ( isMoveUp ) {
                                                self.moveUp();
-                                               $( '#screen-reader-messages' ).text( l10n.widgetMovedUp );
+                                               wp.a11y.speak( l10n.widgetMovedUp );
                                        } else {
                                                self.moveDown();
-                                               $( '#screen-reader-messages' ).text( l10n.widgetMovedDown );
+                                               wp.a11y.speak( l10n.widgetMovedDown );
                                        }
 
                                        $( this ).focus(); // re-focus after the container was moved
                        /**
                         * Handle selecting a sidebar to move to
                         */
-                       this.container.find( '.widget-area-select' ).on( 'click keypress', 'li', function( e ) {
+                       this.container.find( '.widget-area-select' ).on( 'click keypress', 'li', function( event ) {
                                if ( event.type === 'keypress' && ( event.which !== 13 && event.which !== 32 ) ) {
                                        return;
                                }
-                               e.preventDefault();
+                               event.preventDefault();
                                selectSidebarItem( $( this ) );
                        } );
 
                        $saveBtn = this.container.find( '.widget-control-save' );
                        $saveBtn.val( l10n.saveBtnLabel );
                        $saveBtn.attr( 'title', l10n.saveBtnTooltip );
-                       $saveBtn.removeClass( 'button-primary' ).addClass( 'button-secondary' );
+                       $saveBtn.removeClass( 'button-primary' );
                        $saveBtn.on( 'click', function( e ) {
                                e.preventDefault();
                                self.updateWidget( { disable_form: true } ); // @todo disable_form is unused?
 
                        // Handle widgets that support live previews
                        $widgetContent.on( 'change input propertychange', ':input', function( e ) {
-                               if ( self.liveUpdateMode ) {
-                                       if ( e.type === 'change' ) {
-                                               self.updateWidget();
-                                       } else if ( this.checkValidity && this.checkValidity() ) {
-                                               updateWidgetDebounced();
-                                       }
+                               if ( ! self.liveUpdateMode ) {
+                                       return;
+                               }
+                               if ( e.type === 'change' || ( this.checkValidity && this.checkValidity() ) ) {
+                                       updateWidgetDebounced();
                                }
                        } );
 
                 * comparing the loaded form with the sanitized form, whose fields will
                 * be aligned to copy the sanitized over. The elements returned by this
                 * are passed into this._getInputsSignature(), and they are iterated
-                * over when copying sanitized values over to the the form loaded.
+                * over when copying sanitized values over to the form loaded.
                 *
                 * @param {jQuery} container element in which to look for inputs
                 * @returns {jQuery} inputs
                },
 
                /**
-                * Get the property that represents the state of an input.
+                * Get the state for an input depending on its type.
                 *
-                * @param {jQuery|DOMElement} input
-                * @returns {string}
+                * @param {jQuery|Element} input
+                * @returns {string|boolean|array|*}
                 * @private
                 */
-               _getInputStatePropertyName: function( input ) {
-                       var $input = $( input );
+               _getInputState: function( input ) {
+                       input = $( input );
+                       if ( input.is( ':radio, :checkbox' ) ) {
+                               return input.prop( 'checked' );
+                       } else if ( input.is( 'select[multiple]' ) ) {
+                               return input.find( 'option:selected' ).map( function () {
+                                       return $( this ).val();
+                               } ).get();
+                       } else {
+                               return input.val();
+                       }
+               },
 
-                       if ( $input.is( ':radio, :checkbox' ) ) {
-                               return 'checked';
+               /**
+                * Update an input's state based on its type.
+                *
+                * @param {jQuery|Element} input
+                * @param {string|boolean|array|*} state
+                * @private
+                */
+               _setInputState: function ( input, state ) {
+                       input = $( input );
+                       if ( input.is( ':radio, :checkbox' ) ) {
+                               input.prop( 'checked', state );
+                       } else if ( input.is( 'select[multiple]' ) ) {
+                               if ( ! $.isArray( state ) ) {
+                                       state = [];
+                               } else {
+                                       // Make sure all state items are strings since the DOM value is a string
+                                       state = _.map( state, function ( value ) {
+                                               return String( value );
+                                       } );
+                               }
+                               input.find( 'option' ).each( function () {
+                                       $( this ).prop( 'selected', -1 !== _.indexOf( state, String( this.value ) ) );
+                               } );
                        } else {
-                               return 'value';
+                               input.val( state );
                        }
                },
 
                        var self = this, instanceOverride, completeCallback, $widgetRoot, $widgetContent,
                                updateNumber, params, data, $inputs, processing, jqxhr, isChanged;
 
+                       // The updateWidget logic requires that the form fields to be fully present.
+                       self.embedWidgetContent();
+
                        args = $.extend( {
                                instance: null,
                                complete: null,
                        params = {};
                        params.action = 'update-widget';
                        params.wp_customize = 'on';
-                       params.nonce = api.Widgets.data.nonce;
-                       params.theme = api.settings.theme.stylesheet;
+                       params.nonce = api.settings.nonce['update-widget'];
+                       params.customize_theme = api.settings.theme.stylesheet;
+                       params.customized = wp.customize.previewer.query().customized;
 
                        data = $.param( params );
                        $inputs = this._getInputs( $widgetContent );
                        // we know if it got sanitized; if there is no difference in the sanitized value,
                        // then we do not need to touch the UI and mess up the user's ongoing editing.
                        $inputs.each( function() {
-                               var input = $( this ),
-                                       property = self._getInputStatePropertyName( this );
-                               input.data( 'state' + updateNumber, input.prop( property ) );
+                               $( this ).data( 'state' + updateNumber, self._getInputState( this ) );
                        } );
 
                        if ( instanceOverride ) {
                        }
                        data += '&' + $widgetContent.find( '~ :input' ).serialize();
 
+                       if ( this._previousUpdateRequest ) {
+                               this._previousUpdateRequest.abort();
+                       }
                        jqxhr = $.post( wp.ajax.settings.url, data );
+                       this._previousUpdateRequest = jqxhr;
 
                        jqxhr.done( function( r ) {
                                var message, sanitizedForm,     $sanitizedInputs, hasSameInputsInResponse,
                                                $inputs.each( function( i ) {
                                                        var $input = $( this ),
                                                                $sanitizedInput = $( $sanitizedInputs[i] ),
-                                                               property = self._getInputStatePropertyName( this ),
                                                                submittedState, sanitizedState, canUpdateState;
 
                                                        submittedState = $input.data( 'state' + updateNumber );
-                                                       sanitizedState = $sanitizedInput.prop( property );
+                                                       sanitizedState = self._getInputState( $sanitizedInput );
                                                        $input.data( 'sanitized', sanitizedState );
 
-                                                       canUpdateState = ( submittedState !== sanitizedState && ( args.ignoreActiveElement || ! $input.is( document.activeElement ) )   );
+                                                       canUpdateState = ( ! _.isEqual( submittedState, sanitizedState ) && ( args.ignoreActiveElement || ! $input.is( document.activeElement ) ) );
                                                        if ( canUpdateState ) {
-                                                               $input.prop( property, sanitizedState );
+                                                               self._setInputState( $input, sanitizedState );
                                                        }
                                                } );
 
                 * @param {Object} args  merged on top of this.defaultActiveArguments
                 */
                onChangeExpanded: function ( expanded, args ) {
-                       var self = this, $widget, $inside, complete, prevComplete;
+                       var self = this, $widget, $inside, complete, prevComplete, expandControl;
+
+                       self.embedWidgetControl(); // Make sure the outer form is embedded so that the expanded state can be set in the UI.
+                       if ( expanded ) {
+                               self.embedWidgetContent();
+                       }
 
                        // If the expanded state is unchanged only manipulate container expanded states
                        if ( args.unchanged ) {
                        $widget = this.container.find( 'div.widget:first' );
                        $inside = $widget.find( '.widget-inside:first' );
 
-                       if ( expanded ) {
-
-                               self.expandControlSection();
+                       expandControl = function() {
 
                                // Close all other widget controls before expanding this one
                                api.control.each( function( otherControl ) {
 
                                self.container.trigger( 'expand' );
                                self.container.addClass( 'expanding' );
+                       };
+
+                       if ( expanded ) {
+                               if ( api.section.has( self.section() ) ) {
+                                       api.section( self.section() ).expand( {
+                                               completeCallback: expandControl
+                                       } );
+                               } else {
+                                       expandControl();
+                               }
                        } else {
 
                                complete = function() {
                }
        } );
 
+       /**
+        * wp.customize.Widgets.WidgetsPanel
+        *
+        * Customizer panel containing the widget area sections.
+        *
+        * @since 4.4.0
+        */
+       api.Widgets.WidgetsPanel = api.Panel.extend({
+
+               /**
+                * Add and manage the display of the no-rendered-areas notice.
+                *
+                * @since 4.4.0
+                */
+               ready: function () {
+                       var panel = this;
+
+                       api.Panel.prototype.ready.call( panel );
+
+                       panel.deferred.embedded.done(function() {
+                               var panelMetaContainer, noRenderedAreasNotice, shouldShowNotice;
+                               panelMetaContainer = panel.container.find( '.panel-meta' );
+                               noRenderedAreasNotice = $( '<div></div>', {
+                                       'class': 'no-widget-areas-rendered-notice'
+                               });
+                               noRenderedAreasNotice.append( $( '<em></em>', {
+                                       text: l10n.noAreasRendered
+                               } ) );
+                               panelMetaContainer.append( noRenderedAreasNotice );
+
+                               shouldShowNotice = function() {
+                                       return ( 0 === _.filter( panel.sections(), function( section ) {
+                                               return section.active();
+                                       } ).length );
+                               };
+
+                               /*
+                                * Set the initial visibility state for rendered notice.
+                                * Update the visibility of the notice whenever a reflow happens.
+                                */
+                               noRenderedAreasNotice.toggle( shouldShowNotice() );
+                               api.previewer.deferred.active.done( function () {
+                                       noRenderedAreasNotice.toggle( shouldShowNotice() );
+                               });
+                               api.bind( 'pane-contents-reflowed', function() {
+                                       var duration = ( 'resolved' === api.previewer.deferred.active.state() ) ? 'fast' : 0;
+                                       if ( shouldShowNotice() ) {
+                                               noRenderedAreasNotice.slideDown( duration );
+                                       } else {
+                                               noRenderedAreasNotice.slideUp( duration );
+                                       }
+                               });
+                       });
+               },
+
+               /**
+                * Allow an active widgets panel to be contextually active even when it has no active sections (widget areas).
+                *
+                * This ensures that the widgets panel appears even when there are no
+                * sidebars displayed on the URL currently being previewed.
+                *
+                * @since 4.4.0
+                *
+                * @returns {boolean}
+                */
+               isContextuallyActive: function() {
+                       var panel = this;
+                       return panel.active();
+               }
+       });
+
        /**
         * wp.customize.Widgets.SidebarSection
         *
                                items: '> .customize-control-widget_form',
                                handle: '.widget-top',
                                axis: 'y',
+                               tolerance: 'pointer',
                                connectWith: '.accordion-section-content:has(.customize-control-sidebar_widgets)',
                                update: function() {
                                        var widgetContainerIds = self.$sectionContent.sortable( 'toArray' ), widgetIds;
                        /**
                         * Keyboard-accessible reordering
                         */
-                       this.container.find( '.reorder-toggle' ).on( 'click keydown', function( event ) {
-                               if ( event.type === 'keydown' && ! ( event.which === 13 || event.which === 32 ) ) { // Enter or Spacebar
-                                       return;
-                               }
-
+                       this.container.find( '.reorder-toggle' ).on( 'click', function() {
                                self.toggleReordering( ! self.isReordering );
                        } );
                },
                _setupAddition: function() {
                        var self = this;
 
-                       this.container.find( '.add-new-widget' ).on( 'click keydown', function( event ) {
-                               if ( event.type === 'keydown' && ! ( event.which === 13 || event.which === 32 ) ) { // Enter or Spacebar
-                                       return;
-                               }
+                       this.container.find( '.add-new-widget' ).on( 'click', function() {
+                               var addNewWidgetBtn = $( this );
 
                                if ( self.$sectionContent.hasClass( 'reordering' ) ) {
                                        return;
                                }
 
                                if ( ! $( 'body' ).hasClass( 'adding-widget' ) ) {
+                                       addNewWidgetBtn.attr( 'aria-expanded', 'true' );
                                        api.Widgets.availableWidgetsPanel.open( self );
                                } else {
+                                       addNewWidgetBtn.attr( 'aria-expanded', 'false' );
                                        api.Widgets.availableWidgetsPanel.close();
                                }
                        } );
                                }
                        });
 
-                       if ( ! widgetControls.length ) {
+                       if ( 0 === widgetControls.length || ( 1 === api.Widgets.registeredSidebars.length && widgetControls.length <= 1 ) ) {
+                               this.container.find( '.reorder-toggle' ).hide();
                                return;
+                       } else {
+                               this.container.find( '.reorder-toggle' ).show();
                        }
 
                        $( widgetControls ).each( function () {
                 * @todo We should have a reordering state instead and rename this to onChangeReordering
                 */
                toggleReordering: function( showOrHide ) {
+                       var addNewWidgetBtn = this.$sectionContent.find( '.add-new-widget' ),
+                               reorderBtn = this.container.find( '.reorder-toggle' ),
+                               widgetsTitle = this.$sectionContent.find( '.widget-title' );
+
                        showOrHide = Boolean( showOrHide );
 
                        if ( showOrHide === this.$sectionContent.hasClass( 'reordering' ) ) {
                                        formControl.collapse();
                                } );
 
-                               this.$sectionContent.find( '.first-widget .move-widget' ).focus();
-                               this.$sectionContent.find( '.add-new-widget' ).prop( 'tabIndex', -1 );
+                               addNewWidgetBtn.attr({ 'tabindex': '-1', 'aria-hidden': 'true' });
+                               reorderBtn.attr( 'aria-label', l10n.reorderLabelOff );
+                               wp.a11y.speak( l10n.reorderModeOn );
+                               // Hide widget titles while reordering: title is already in the reorder controls.
+                               widgetsTitle.attr( 'aria-hidden', 'true' );
                        } else {
-                               this.$sectionContent.find( '.add-new-widget' ).prop( 'tabIndex', 0 );
+                               addNewWidgetBtn.removeAttr( 'tabindex aria-hidden' );
+                               reorderBtn.attr( 'aria-label', l10n.reorderLabelOn );
+                               wp.a11y.speak( l10n.reorderModeOff );
+                               widgetsTitle.attr( 'aria-hidden', 'false' );
                        }
                },
 
                /**
+                * Get the widget_form Customize controls associated with the current sidebar.
+                *
+                * @since 3.9.0
                 * @return {wp.customize.controlConstructor.widget_form[]}
                 */
                getWidgetFormControls: function() {
-                       var formControls;
+                       var formControls = [];
 
-                       formControls = _( this.setting() ).map( function( widgetId ) {
+                       _( this.setting() ).each( function( widgetId ) {
                                var settingId = widgetIdToSettingId( widgetId ),
                                        formControl = api.control( settingId );
-
-                               if ( ! formControl ) {
-                                       return;
+                               if ( formControl ) {
+                                       formControls.push( formControl );
                                }
-
-                               return formControl;
                        } );
 
                        return formControls;
                        isExistingWidget = api.has( settingId );
                        if ( ! isExistingWidget ) {
                                settingArgs = {
-                                       transport: 'refresh',
+                                       transport: api.Widgets.data.selectiveRefreshableWidgets[ widget.get( 'id_base' ) ] ? 'postMessage' : 'refresh',
                                        previewer: this.setting.previewer
                                };
                                setting = api.create( settingId, settingId, '', settingArgs );
                                        is_new: ! isExistingWidget,
                                        width: widget.get( 'width' ),
                                        height: widget.get( 'height' ),
-                                       is_wide: widget.get( 'is_wide' )
+                                       is_wide: widget.get( 'is_wide' ),
+                                       active: true
                                },
                                previewer: self.setting.previewer
                        } );
 
                        controlContainer.slideDown( function() {
                                if ( isExistingWidget ) {
-                                       widgetFormControl.expand();
                                        widgetFormControl.updateWidget( {
-                                               instance: widgetFormControl.setting(),
-                                               complete: function( error ) {
-                                                       if ( error ) {
-                                                               throw error;
-                                                       }
-                                                       widgetFormControl.focus();
-                                               }
+                                               instance: widgetFormControl.setting()
                                        } );
-                               } else {
-                                       widgetFormControl.focus();
                                }
                        } );
 
                }
        } );
 
-       // Register models for custom section and control types
+       // Register models for custom panel, section, and control types
+       $.extend( api.panelConstructor, {
+               widgets: api.Widgets.WidgetsPanel
+       });
        $.extend( api.sectionConstructor, {
                sidebar: api.Widgets.SidebarSection
        });
                return foundControl;
        };
 
+       /**
+        * Initialize Edit Menu button in Nav Menu widget.
+        */
+       $( document ).on( 'widget-added', function( event, widgetContainer ) {
+               var parsedWidgetId, widgetControl, navMenuSelect, editMenuButton;
+               parsedWidgetId = parseWidgetId( widgetContainer.find( '> .widget-inside > .form > .widget-id' ).val() );
+               if ( 'nav_menu' !== parsedWidgetId.id_base ) {
+                       return;
+               }
+               widgetControl = api.control( 'widget_nav_menu[' + String( parsedWidgetId.number ) + ']' );
+               if ( ! widgetControl ) {
+                       return;
+               }
+               navMenuSelect = widgetContainer.find( 'select[name*="nav_menu"]' );
+               editMenuButton = widgetContainer.find( '.edit-selected-nav-menu > button' );
+               if ( 0 === navMenuSelect.length || 0 === editMenuButton.length ) {
+                       return;
+               }
+               navMenuSelect.on( 'change', function() {
+                       if ( api.section.has( 'nav_menu[' + navMenuSelect.val() + ']' ) ) {
+                               editMenuButton.parent().show();
+                       } else {
+                               editMenuButton.parent().hide();
+                       }
+               });
+               editMenuButton.on( 'click', function() {
+                       var section = api.section( 'nav_menu[' + navMenuSelect.val() + ']' );
+                       if ( section ) {
+                               focusConstructWithBreadcrumb( section, widgetControl );
+                       }
+               } );
+       } );
+
+       /**
+        * Focus (expand) one construct and then focus on another construct after the first is collapsed.
+        *
+        * This overrides the back button to serve the purpose of breadcrumb navigation.
+        *
+        * @param {wp.customize.Section|wp.customize.Panel|wp.customize.Control} focusConstruct - The object to initially focus.
+        * @param {wp.customize.Section|wp.customize.Panel|wp.customize.Control} returnConstruct - The object to return focus.
+        */
+       function focusConstructWithBreadcrumb( focusConstruct, returnConstruct ) {
+               focusConstruct.focus();
+               function onceCollapsed( isExpanded ) {
+                       if ( ! isExpanded ) {
+                               focusConstruct.expanded.unbind( onceCollapsed );
+                               returnConstruct.focus();
+                       }
+               }
+               focusConstruct.expanded.bind( onceCollapsed );
+       }
+
        /**
         * @param {String} widgetId
         * @returns {Object}