On 10/29/07, Ken Tilton <[EMAIL PROTECTED]> wrote: > Andy Chambers wrote: > > On 10/29/07, Andy Chambers <[EMAIL PROTECTED]> wrote:
> > OK. I think I know why its not working. The ffi call never gets made > > because cells only uses it if either the new or old value is not nil. > > Properties are propagated from the Lisp model to Gtk by "observers" on a > slot. Celtk and Cells-Gtk generate these observers as part of the > macroexpansion of the def<i forget> macro to which it seems you > correctly added the slot. It should not matter that the value (as you > imply) never changes, because Cells understands that an initial > propagation is necessary so observers and observed start out in synch. > > You can check that you see an observer in the macroexpansion, then that > that is being called. If not, I would have a concern that Cells-Gtk has > not been upgraded to use the latest version of Cells, because I have a > faint recollection that possibly older versions do not propagate a nil > initial value. I would be shocked if it did not propagate a non-nil > value, so one thing you might try as a sanity check is to specify a > non-nil just to see if anything fires. The observer is being created in the macro-expansion. That's how I knew to add the ffi definition (how cool is it that the software knew what function it needed to call before I did :-)). My immediate problem is fixed by overriding the generated observer to always propagate the value so I think you're spot on about cells-gtk not using the latest cells but I'm starting to have some fun now and feel a lot more confident about trying to upgrade. Cheers, Andy _______________________________________________ cells-gtk-devel site list [email protected] http://common-lisp.net/mailman/listinfo/cells-gtk-devel
