Joseph Carroll Messages: 156 Registered: May 2012 Location: Milwaukee, WI
Not sure what you mean by styling engine / skin event, but I am assuming you mean the CSS styling engine and the different CSS properties / style elementss.
You are able to subscribe to widget events through the topic UIEvents.UIElement.TOPIC_WIDGET. However, (AFAIK) I do not believe there is a way to receive CSS styling events.
Workbench UI events are published from the UIEventPublisher which utilizes the emf notifier framework. Because the CSS styling engine was designed for use in 3.x and 4.x using the same notifier framework would not be possible. After a brief review of the AbstractCSSEngine and its subclasses, it does not appear as though any store a list of listeners for notification.
You might want to investigate AbstractCSSEngine/CSSEngineImpl a little more yourself.