text: /* global _wpCustomizeLoaderSettings, confirm */
  /*
   * Expose a public API that allows the customizer to be
   * loaded on any page.
   */
  window.wp = window.wp || {};
  
  (function( exports, $ ){
  	var api = wp.customize,
  		Loader;
  
  	$.extend( $.support, {
  		history: !! ( window.history && history.pushState ),
  		hashchange: ('onhashchange' in window) && (document.documentMode === undefined || document.documentMode > 7)
  	});
  
  	/**
  	 * Allows the Customizer to be overlayed on any page.
  	 *
  	 * By default, any element in the body with the load-customize class will open
  	 * an iframe overlay with the URL specified.
  	 *
  	 *     e.g. <a class="load-customize" href="<?php echo wp_customize_url(); ?>">Open Customizer</a>
  	 *
  	 * @augments wp.customize.Events
  	 */
  	Loader = $.extend( {}, api.Events, {
  		/**
  		 * Setup the Loader; triggered on document#ready.
  		 */
  		initialize: function() {
  			this.body = $( document.body );
  
  			// Ensure the loader is supported.
  			// Check for settings, postMessage support, and whether we require CORS support.
  			if ( ! Loader.settings || ! $.support.postMessage || ( ! $.support.cors && Loader.settings.isCrossDomain ) ) {
  				return;
  			}
  
  			this.window  = $( window );
  			this.element = $( '<div id="customize-container" />' ).appendTo( this.body );
  
  			// Bind events for opening and closing the overlay.
  			this.bind( 'open', this.overlay.show );
  			this.bind( 'close', this.overlay.hide );
  
  			// Any element in the body with the `load-customize` class opens
  			// the Customizer.
  			$('#wpbody').on( 'click', '.load-customize', function( event ) {
  				event.preventDefault();
  
  				// Store a reference to the link that opened the Customizer.
  				Loader.link = $(this);
  				// Load the theme.
  				Loader.open( Loader.link.attr('href') );
  			});
  
  			// Add navigation listeners.
  			if ( $.support.history ) {
  				this.window.on( 'popstate', Loader.popstate );
  			}
  
  			if ( $.support.hashchange ) {
  				this.window.on( 'hashchange', Loader.hashchange );
  				this.window.triggerHandler( 'hashchange' );
  			}
  		},
  
  		popstate: function( e ) {
  			var state = e.originalEvent.state;
  			if ( state && state.customize ) {
  				Loader.open( state.customize );
  			} else if ( Loader.active ) {
  				Loader.close();
  			}
  		},
  
  		hashchange: function() {
  			var hash = window.location.toString().split('#')[1];
  
  			if ( hash && 0 === hash.indexOf( 'wp_customize=on' ) ) {
  				Loader.open( Loader.settings.url + '?' + hash );
  			}
  
  			if ( ! hash && ! $.support.history ) {
  				Loader.close();
  			}
  		},
  
  		beforeunload: function () {
  			if ( ! Loader.saved() ) {
  				return Loader.settings.l10n.saveAlert;
  			}
  		},
  
  		/**
  		 * Open the Customizer overlay for a specific URL.
  		 *
  		 * @param  string src URL to load in the Customizer.
  		 */
  		open: function( src ) {
  
  			if ( this.active ) {
  				return;
  			}
  
  			// Load the full page on mobile devices.
  			if ( Loader.settings.browser.mobile ) {
  				return window.location = src;
  			}
  
  			// Store the document title prior to opening the Live Preview
  			this.originalDocumentTitle = document.title;
  
  			this.active = true;
  			this.body.addClass('customize-loading');
  
  			/*
  			 * Track the dirtiness state (whether the drafted changes have been published)
  			 * of the Customizer in the iframe. This is used to decide whether to display
  			 * an AYS alert if the user tries to close the window before saving changes.
  			 */
  			this.saved = new api.Value( true );
  
  			this.iframe = $( '<iframe />', { 'src': src, 'title': Loader.settings.l10n.mainIframeTitle } ).appendTo( this.element );
  			this.iframe.one( 'load', this.loaded );
  
  			// Create a postMessage connection with the iframe.
  			this.messenger = new api.Messenger({
  				url: src,
  				channel: 'loader',
  				targetWindow: this.iframe[0].contentWindow
  			});
  
  			// Wait for the connection from the iframe before sending any postMessage events.
  			this.messenger.bind( 'ready', function() {
  				Loader.messenger.send( 'back' );
  			});
  
  			this.messenger.bind( 'close', function() {
  				if ( $.support.history ) {
  					history.back();
  				} else if ( $.support.hashchange ) {
  					window.location.hash = '';
  				} else {
  					Loader.close();
  				}
  			});
  
  			// Prompt AYS dialog when navigating away
  			$( window ).on( 'beforeunload', this.beforeunload );
  
  			this.messenger.bind( 'saved', function () {
  				Loader.saved( true );
  			} );
  			this.messenger.bind( 'change', function () {
  				Loader.saved( false );
  			} );
  
  			this.messenger.bind( 'title', function( newTitle ){
  				window.document.title = newTitle;
  			});
  
  			this.pushState( src );
  
  			this.trigger( 'open' );
  		},
  
  		pushState: function ( src ) {
  			var hash = src.split( '?' )[1];
  
  			// Ensure we don't call pushState if the user hit the forward button.
  			if ( $.support.history && window.location.href !== src ) {
  				history.pushState( { customize: src }, '', src );
  			} else if ( ! $.support.history && $.support.hashchange && hash ) {
  				window.location.hash = 'wp_customize=on&' + hash;
  			}
  
  			this.trigger( 'open' );
  		},
  
  		/**
  		 * Callback after the Customizer has been opened.
  		 */
  		opened: function() {
  			Loader.body.addClass( 'customize-active full-overlay-active' );
  		},
  
  		/**
  		 * Close the Customizer overlay and return focus to the link that opened it.
  		 */
  		close: function() {
  			if ( ! this.active ) {
  				return;
  			}
  
  			// Display AYS dialog if Customizer is dirty
  			if ( ! this.saved() && ! confirm( Loader.settings.l10n.saveAlert ) ) {
  				// Go forward since Customizer is exited by history.back()
  				history.forward();
  				return;
  			}
  
  			this.active = false;
  
  			this.trigger( 'close' );
  
  			// Restore document title prior to opening the Live Preview
  			if ( this.originalDocumentTitle ) {
  				document.title = this.originalDocumentTitle;
  			}
  
  			// Return focus to link that was originally clicked.
  			if ( this.link ) {
  				this.link.focus();
  			}
  		},
  
  		/**
  		 * Callback after the Customizer has been closed.
  		 */
  		closed: function() {
  			Loader.iframe.remove();
  			Loader.messenger.destroy();
  			Loader.iframe    = null;
  			Loader.messenger = null;
  			Loader.saved     = null;
  			Loader.body.removeClass( 'customize-active full-overlay-active' ).removeClass( 'customize-loading' );
  			$( window ).off( 'beforeunload', Loader.beforeunload );
  		},
  
  		/**
  		 * Callback for the `load` event on the Customizer iframe.
  		 */
  		loaded: function() {
  			Loader.body.removeClass('customize-loading');
  		},
  
  		/**
  		 * Overlay hide/show utility methods.
  		 */
  		overlay: {
  			show: function() {
  				this.element.fadeIn( 200, Loader.opened );
  			},
  
  			hide: function() {
  				this.element.fadeOut( 200, Loader.closed );
  			}
  		}
  	});
  
  	// Bootstrap the Loader on document#ready.
  	$( function() {
  		Loader.settings = _wpCustomizeLoaderSettings;
  		Loader.initialize();
  	});
  
  	// Expose the API publicly on window.wp.customize.Loader
  	api.Loader = Loader;
  })( wp, jQuery );
  