Introduce new theme customizer to replace theme preview. Rough first pass. props koopersmith, ocean90. see #19910.

Merges in http://plugins.svn.wordpress.org/gandalf/branches/dev/ rev 510148.

git-svn-id: https://develop.svn.wordpress.org/trunk@19995 602fd350-edb4-49c9-b593-d223f7449a82

wp-includes/js/customize-preview.dev.js

@@ -0,0 +1,59 @@
+(function( exports, $ ){
+	var api = wp.customize;
+
+	api.Preview = api.Messenger.extend({
+		/**
+		 * Requires params:
+		 *  - url    - the URL of preview frame
+		 *
+		 * @todo: Perhaps add a window.onbeforeunload dialog in case the theme
+		 *        somehow attempts to leave the page and we don't catch it
+		 *        (which really shouldn't happen).
+		 */
+		initialize: function( url, options ) {
+			var self = this;
+
+			$.extend( this, options || {} );
+
+			api.Messenger.prototype.initialize.call( this, url );
+
+			this.body = $( document.body );
+			this.body.on( 'click.preview', 'a', function( event ) {
+				event.preventDefault();
+				self.send( 'url', $(this).attr('href') );
+			});
+
+			// You cannot submit forms.
+			// @todo: Namespace customizer settings so that we can mix the
+			//        $_POST data with the customize setting $_POST data.
+			this.body.on( 'submit.preview', 'form', function( event ) {
+				event.preventDefault();
+			});
+
+			this.bind( 'url', function( url ) {
+				this.url( url );
+				this.refresh();
+			});
+		},
+		refresh: function() {
+			this.submit({
+				target: this.iframe.prop('name'),
+				action: this.url()
+			});
+		},
+		submit: function( props ) {
+			if ( props )
+				this.form.prop( props );
+			this.form.submit();
+			if ( props )
+				this.form.prop( this._formOriginalProps );
+		}
+	});
+
+	$( function() {
+		var preview;
+
+		preview = new api.Preview( api.settings.parent );
+	});
+
+})( wp, jQuery );