[REBOL] Re: Liquid Project : connection with datas...
From: moliad:aei:ca at: 16-Oct-2003 0:14
sorry for the time it took to reply,
I was trying to find a bug which in the end is not a bug... it had only
forgotten to create the pipe (in example B)...
----- Original Message -----
From: "Philippe Oehler" <[info--id-net--ch]>
> Hi there,
>
> For those who hadn't read the concept of liquid, read it. That's great !
thanks! all the effort is not it vain, then... :-)
> I have a question. How can I connect VID elements (i should say Liquid
> Elements) to block of data that aren't VID elements ?
you must, of course, open the liquid library
and then, in the code, before or after building a liquid-vid layout, you use the
attach method to attach one valve to another valve's pipe.
example A: valve created after
;----------------------8<--------------------------
rebol []
liquid: open-library 'liquid 0.0.5
lvid: open-library 'liquid-vid 0.0.5
lvid-style: lvid/style ; because VID's layout does not support objects paths...
gui: layout [
across
styles lvid-style
value-sldr: slider 200x20 min 1 max 100
field attach value-sldr 50
]
valve: liquify liquid/valve! []
valve/attach value-sldr/valve ; attach this valve to that slider
valve/handle [
print data + 20
]
valve/refill none ; calls an update just on this valve with the pipe's current
value.
view gui
;-----------------------8<-------------------------
example B: valve created before
rebol []
liquid: open-library 'liquid 0.0.5
lvid: open-library 'liquid-vid 0.0.5
lvid-style: lvid/style ; because VID's layout does not support objects paths...
myvalve: liquify liquid/valve! [
pipe/create
handle [print data + 20]
]
view layout [
across
styles lvid-style
fld: field 50
value-sldr: slider 200x20 min 1 max 100 connect myvalve
]
;-----------------------8<-------------------------
both code snippets create exactly the same internal setup.
-From now on, any change to the slider is updated in the field, any change in
the field is updated to the slider.
-A print will ALSO be done (value + 20), everytime the value changes.
-The field is validated according to slider because it is attached to it. Since
validation is persistent, entering a string in the field will reset the field to
zero (0). Furthermore, because is uses a more flexible to-integer
(steel-utils/as-integer), you can write extra string data (like a %, $, ? even
words) and the numeric value in it will still be extracted... rebol's to-integer
would just crash. the code.
both examples can be further reduced, but it will make it harder to understand
so I left them like so.
HTH!
-MAx
