Orm Finnendahl o.finnendahl@mh-freiburg.de writes:

Hi,

I'm trying to realize a specialized browser for nested tree structures (displayed as graphics) using mcclim. I just started to learn clim and there are quite a few things still unclear to me (I read the paper of Ciccarelli and most resources I could get a hold of, though).

As a starting point I use the clim-fig example in the demo package and managed to implement feedback during movement of figures (dragging) and hooking into the highlight function of the drawing pane.

I need to access the data structure being presented within the context of the highlight method (invoked on mouse-over). Below is the highlight method specialized on the figure type of clim-fig. The "record" arg contains the output-record which seems to maintain a copy of the graphical representation information of the figure object, but I have no idea how to access the figure itself or the slots of its representation in the application frame.

(define-presentation-method highlight-presentation ((type figure) record (stream (eql (find-pane-named *application-frame* 'canvas))) (state (eql :highlight)))

...)

Can anybody help?

Thanks, Orm Finnendahl

The output record is also the presentation (a presentation is a kind of output record), so use the PRESENTATION-OBJECT function to retrieve the object associated with it.