1 files changed, 164 insertions, 0 deletions
diff --git a/src/wp-includes/js/customize-loader.js b/src/wp-includes/js/customize-loader.js
new file mode 100644
index 0000000000..2ecbbe0fbf
--- /dev/null
+++ b/src/wp-includes/js/customize-loader.js
@@ -0,0 +1,164 @@
+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)
+	});
+
+	Loader = $.extend( {}, api.Events, {
+		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 );
+
+			this.bind( 'open', this.overlay.show );
+			this.bind( 'close', this.overlay.hide );
+
+			$('#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( e ) {
+			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();
+		},
+
+		open: function( src ) {
+			var hash;
+
+			if ( this.active )
+				return;
+
+			// Load the full page on mobile devices.
+			if ( Loader.settings.browser.mobile )
+				return window.location = src;
+
+			this.active = true;
+			this.body.addClass('customize-loading');
+
+			this.iframe = $( '<iframe />', { src: src }).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();
+			});
+
+			this.messenger.bind( 'activated', function( location ) {
+				if ( location )
+					window.location = location;
+			});
+
+			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' );
+		},
+
+		opened: function() {
+			Loader.body.addClass( 'customize-active full-overlay-active' );
+		},
+
+		close: function() {
+			if ( ! this.active )
+				return;
+			this.active = false;
+
+			this.trigger( 'close' );
+
+			// Return focus to link that was originally clicked.
+			if ( this.link )
+				this.link.focus();
+		},
+
+		closed: function() {
+			Loader.iframe.remove();
+			Loader.messenger.destroy();
+			Loader.iframe    = null;
+			Loader.messenger = null;
+			Loader.body.removeClass( 'customize-active full-overlay-active' ).removeClass( 'customize-loading' );
+		},
+
+		loaded: function() {
+			Loader.body.removeClass('customize-loading');
+		},
+
+		overlay: {
+			show: function() {
+				this.element.fadeIn( 200, Loader.opened );
+			},
+
+			hide: function() {
+				this.element.fadeOut( 200, Loader.closed );
+			}
+		}
+	});
+
+	$( function() {
+		Loader.settings = _wpCustomizeLoaderSettings;
+		Loader.initialize();
+	});
+
+	// Expose the API to the world.
+	api.Loader = Loader;
+})( wp, jQuery );