if (editor instanceof CompilationUnitEditor) { fListener= new ElementChangedListener(); JavaCore.addElementChangedListener(fListener); }
fViewer= viewer; fViewer.addProjectionListener(this); projectionEnabled();
	public void install(JavaEditor editor) {		fEditor= editor;		if (editor instanceof CompilationUnitEditor) {			fListener= new ElementChangedListener();			JavaCore.addElementChangedListener(fListener);		}	}