java - How to handle close tab in eclipse RCP 4 -

i want make validation when pulse close button of tab in eclipse rcp 4 application , if validation fails prevent de close.

if don't want use part.setdirty(true) isavehandler greg-449 montioned, listen model events , correct things there. in direction of this:

public class preventcloseaddon {     @postconstruct     public void init(final ieventbroker eventbroker, final epartservice partservice) {         eventhandler tbrhandler = new eventhandler() {             @override             public void handleevent(event event) {                 if (!uievents.isset(event))                     return;                 object element = event.getproperty(uievents.eventtags.element);                 if (element instanceof mpart) {                     mpart part = (mpart) element;                     if (!part.istoberendered()) {                         // ... validate here ...                         part.settoberendered(true);                         partservice.activate(part);                     }                 }             }         };         eventbroker.subscribe(uievents.uielement.topic_toberendered, tbrhandler);     } } 

you should aware part rendered again code.