[mcclim-devel] Update object of a presentation.

[Paul Werkowski]

> 
> I have found it much more difficult to figure out how to take this UI
> model and map it onto process control applications, which are of primary
> interest to me.  In such applications, there is an external process,
> operating asynchronously with the program, that sends (conceptually, at
> any rate) updates that should be reflected on the display, so that the
> user remains aware of the state of the process.
> 
> Such applications seem to map less cleanly onto the CLIM model, and
> *may* fit more nicely onto constraint-based UI frameworks like Garnet
> and whatever that cells thing is...
> 
>

All you really have to do is modify your object and get REDISPLAY to
run. This happens by default when :incremental-redisplay is true
and the object modification is the result of a command (including some
command invoked by define-presentation-to-command-translator).

Look at Examples/stopwatch.lisp to see how an external process can cause
the display to be updated.

Paul