ok, after some mailing with Kenny - this works:
(defpackage CellsChat
(:use :cl :cells))
(in-package :CellsChat)
(defparameter *newline* (princ-to-string #\Newline))
(defmodel Participant ()
((chat :cell nil :accessor chat-of :initarg :chat
:initform (error "Participants need something for its `chat'-slot."))
(username :cell nil :accessor username-of :initarg :username
:initform (error "CellsChat needs a `username'."))
(speech :cell :ephemeral :accessor speech-of :initarg :speech
:initform (c-in nil))))
(defmethod initialize-instance :after ((participant Participant) &key)
(push participant (participants-of (chat-of participant))))
(defobserver speech ((participant Participant))
;; `new-value' always refers to the slot `speech'
;; since that is what we're observing
(when new-value
(dolist (participant (participants-of (chat-of participant)))
(format t "Update interface for '~A', appending: ~A~%"
(username-of participant) new-value))))
(defmethod say ((participant Participant) (what string))
(setf (speech-of participant)
(concatenate 'string (username-of participant) ": " what *newline*)))
(defmodel Chat ()
((text-box :accessor text-box-of
:initform (c? (concatenate 'string
;; conversation till now..
(or .cache "")
;; well, ok then - this is neat O_o
(some 'speech-of
(participants-of self)))))
(participants :accessor participants-of
:initform (c-in nil))))
(defun testChat ()
(let* ((chat (make-instance 'Chat))
(user1 (make-instance 'Participant :username "user1" :chat chat))
(user2 (make-instance 'Participant :username "user2" :chat chat)))
(say user1 "Hello, anyone here?")
(say user2 "Well hello there - I'm here :)")
(say user1 "Cool .. what's up?")
(say user2 "Just doing some Lisp-hacking -- you?")
(say user1 "Naaaw .. nothing; I'm kind of tired, so I'm just
sitting in the sun here listening to some music")))
..pretty darn cool :)
--
Mvh,
Lars Rune Nøstdal
http://lars.nostdal.org/
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