Werner Thie wrote:
> Hi
>
> Don't know if Ken with it's server side UI generation has a fancy
> designer at hand (my LISP experience was before GUIs) but going further
> than aggregating a few elements, UI writing and maintenance becomes a
> pain real fast.
What we do in Lisp is use macros and other neat features of the language
to make the code assembling a GUI so dense that it is faster to juggle
the code than it would be to mess with a GUI builder:
(defun search-panel-kt (self)
(hbox (:align-y 'middle :spacing 12)
(:allow-grow-y :js-false
:padding 4)
(lbl "Search for:")
(textfield :symbol-string ;; WARNING -- new and untested
:add '(:flex 1)
:allow-grow-x t
:onchangevalue (lambda (self req)
(let ((sympart (req-val req "value")))
(setf (sym-seg (u^ qxl-session)) sympart))))
(button "Search" (:enabled (c? (> (length (value (psib))) 1)))
:onexec (b-when sympart (value (psib))
(print `(:sympart-onexec ,sympart))
(setf (sym-seg (u^ qxl-session)) sympart)))))
And because it is code (and because I am driving qooxdoo dynamically
from the code) I can move things around in the code and hit refresh in
the browser and see the result. Even against a "build" version, which I
only need to regenerate if I start using a new qx class.
Note also the "enabled" rule*. In this case it is just looking at
another widget, but it could also being looking at business data and
making a decision based on business logic. Even better, instead of just
deciding the enabled state of a widget, a rule for the children of a
composite widget could decide to put up a whole new (or just slightly
modified interface) based on business logic. This lets GUIs be leaner,
smarter, and more helpful, showing users only what is appropriate for
the state of their particular browsing experience as it unfolds.
kt
* Actually, I took that rule out of the demo. A bit of trouble detecting
/as they type/ (that being the whole idea) whether the field is empty or
not -- the (I think) "input" event happens before the text gets updated,
so I ended up guessing (badly) based on the keystrokes whether the field
was empty or not and punted on that.
--
http://www.stuckonalgebra.com
"The best Algebra tutorial program I have seen... in a class by itself."
Macworld
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