dialog: fixed enable and disable methods

Author: rdworth

tests/unit/dialog/dialog_methods.js

@@ -68,14 +68,22 @@ test("enable", function() {
 	var expected = $('<div></div>').dialog(),
 		actual = expected.dialog('enable');
 	equals(actual, expected, 'enable is chainable');
-	ok(false, 'missing test - untested code is broken code');
+	
+	el = $('<div></div>').dialog({ disabled: true });
+	el.dialog('enable');
+	equals(el.dialog('option', 'disabled'), false, 'enable method sets disabled option to false');
+	ok(!el.parents('.ui-dialog').hasClass('ui-dialog-disabled'), 'enable method removes ui-dialog-disabled class from ui-dialog element');
 });
 
 test("disable", function() {
 	var expected = $('<div></div>').dialog(),
 		actual = expected.dialog('disable');
 	equals(actual, expected, 'disable is chainable');
-	ok(false, 'missing test - untested code is broken code');
+	
+	el = $('<div></div>').dialog({ disabled: false });
+	el.dialog('disable');
+	equals(el.dialog('option', 'disabled'), true, 'disable method sets disabled option to true');
+	ok(el.parents('.ui-dialog').hasClass('ui-dialog-disabled'), 'disable method adds ui-dialog-disabled class to ui-dialog element');
 });
 
 test("close", function() {

ui/jquery.ui.dialog.js

@@ -442,6 +442,11 @@ $.widget("ui.dialog", {
 					.removeClass(self.options.dialogClass)
 					.addClass(uiDialogClasses + value);
 				break;
+			case "disabled":
+				(value
+					? uiDialog.addClass('ui-dialog-disabled')
+					: uiDialog.removeClass('ui-dialog-disabled'));
+				break;
 			case "draggable":
 				(value
 					? self._makeDraggable()