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Close Part Listener [message #847713]

Tue, 17 April 2012 15:25

Philippe Fry

Messages: 8
Registered: April 2012

Junior Member

Hi,

Can you tell me the best practice to be informed when user close a Part ? I thought add a PartListener on a EPartService, but I don't know where is the best place to do that. I tried to add and Addon to my E4 application model but the EPartService injected is an AplicationPartServiceImpl (not a PartServiceImpl), and the add of a PartListener throws new UnsupportedOperationException("Listeners should only be attached/removed from a window's part service");

Futhermore I would like to be notified when user close a certain kind of part (of type CompatibilityEditor)

I cannot annotate a method in my view with @PreDestroy (and do my stuff in this method) because I have not write the view's code myself is't a org.eclipse.ui.internal.e4.compatibility.CompatibilityEditor

Because I use compatibility layer my views are opened like that :
PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage()
.openEditor(..., DiagramEditor.DIAGRAM_EDITOR_ID);

Thanks a lot

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Re: Close Part Listener [message #847968 is a reply to message #847713]

Tue, 17 April 2012 20:53

Eclipse User

The framework sends events for a lot of event types and you can easily subscribe to those using the IEventBroker. Here is an addon that registers a listener like the one you require. I haven't tested it with compatibility layers but it should work.

public class TestAddon {
	
	private EventHandler testHandler;
	@PostConstruct
	public void pc(IEventBroker eventBroker)
	{
		testHandler = new EventHandler() {
			
			@Override
			public void handleEvent(Event event) {
				Object part = event.getProperty(UIEvents.EventTags.ELEMENT);
				boolean tbr =(Boolean) event.getProperty(UIEvents.EventTags.NEW_VALUE);
				if (part instanceof MPart){
					System.out.println("Part "+((MPart)part).getElementId()+" is "+(!tbr?"NOT":"")+" visible");
				}
			}
		};
		eventBroker.subscribe(UIEvents.UIElement.TOPIC_TOBERENDERED, testHandler);
	}
	
	//....................
}

So the idea is:
- implement an event handler, check that the ELEMENT event tag is instance of MPart, get the new value (NEW_VALUE event tag) and do what you wish with it.
- subscribe this handler to the TOBERENDERED topic
- unsubscribe when you're done.

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