Hi,

I'm trying to define some graphical presentation types in CLIM 1.0,
and I can't see from the manual how to place the "location"
parameters.

I have a type like "city", and I want to be able to say:

(present current-city 'city
        :stream stream
        :color clim:+red+
        :X 235
        :Y 115
        :orientation 'vertical)

The problem is, I can't see form any of the examples, how to add the
keyword arguments to the defintion:

(clim:define-presentation-method clim:present
    (city (type city) stream (view clim:textual-view)
        &key color x y orientation)
...

This doesn't work, as I get an error from CLIM:

keyword :COLOR

(Any change in params results in the first keyword giving the error,
so it's not that COLOR was ill-defined).

Is it possible to do what I want?

Also, I'm using CLIM:TEXTUAL-VIEW because it's the only
presentation-type I know of, but I really should be defining a
GRAPHICAL-VIEW for this shouldn't I?  How is this done?  The manual is
rather obtuse on this matter.

jas

--
--------------------------------------------------------------------------
Jeffrey A. Sullivan             | Research Scientist et al.

72511,402    (Compuserve)       | University of Southern California

mailing list.  I'm not a CLIM expert, and I'm basing my response on
knowledge of Dynamic Windows, on which CLIM is based, and which I believe
is very similar in the area of your question.

Presentation options are specified in DEFINE-PRESENTATION-TYPE, and you
include them in the presentation type specifier when you call PRESENT.  For
example:

(clim:define-presentation-type city ()
  :options (color x y orientation)
  ...)

(present current-city '((city) :color clim:+red+ :x 235 :y 115
                               :orientation 'vertical))

Your presentation method can then access the variables COLOR, X, Y, and
ORIENTATION.
--
Barry Margolin
System Manager, Thinking Machines Corp.

First of all, I'm not really a CLIM wizard (but I'm working on it) so
these solutions may involve some testing on your part.  However, I
needed similar features and found the manual a little confusing.  I
got help from the CLIM mailing list, which you should try sometime.

I assume you have "city" defined similarly to this:

(define-presentation-type city ()
  :options (color x y orientation))

If not, that's where your first problem is.

This should be as follows (see the discussion on presentation type
specifiers in the manual):

(present current-city '((city) :color clim:+red+
                               :x 235
                               :y 115
                               :orientation vertical)
         :stream stream
         :view +graphical-view+)   ; see below

                                    ^^^^^^^^^^^^^^^^^
                                    graphical-view ; see below

I think if you call present as I have outlined above, you won't get
the errors for having the keyword arguments.  On the other hand you
don't even need them.  According to the CLIM-2 spec, they become
automatically lexically available in the body of your definition.

CLIM-2 has different types of view.  Here's what I do in CLIM-1:

(defclass graphical-view (textual-view)
          ()
  (:documentation "A new view for graphical representations of
objects."))

(defvar +graphical-view+ (make-instance 'graphical-view)
  "An instance of the view graphical-view.")

This is where the :view came into my present call above.

You should also specify a default method which doesn't specialize
on the view.  I also set the default-view for the panes in which my
graphical objects are displayed.

Randy

P.S.  If you need more help, feel free to e-mail me.
--
Randy A. Coulman                |       ARIES Laboratory
Research Assistant              |       Department of Computational Science
                                |       University of Saskatchewan