[REBOL] VID List 'supply function and dynamic widget reinitialization
From: geza67::freestart::hu at: 23-Apr-2002 21:37
Hello REBOLers,
A week ago or two I got nice ideas to reinitialize/redraw toggles in
an iterated list. Now I am stuck with a more complex structure, namely
the rotary.
I tried several initialization strategies, some of them even did not
let to "rotate" the rotary, i.e. it stayed the same.
The model below characterizes best my wishes: I store the state (the
'index? of 'data list) of the rotary in a global context list, where
the n-th cell will be set to 'index? In the scenario n is the row
count of the list, thus the 'count word of the 'supply function.
rebol[]
c: ["1" "2" "3" "4"]
l: ["first" "second" "third" "fourth"]
view layout [
list 600x400 [
across
cnt: info "1"
answer: rotary 240 [
poke a to-integer cnt/text index? answer/data
] data copy head l
] supply [
if count > length? l [face/show?: false exit]
face/show?: true
switch index [
1 [
face/text: pick c count
]
2 [
face/text: probe pick l a/:count
]
]
]
do [a: [1 1 1 1]]
]
Unfortunately, the code - the intention, to set the
variables in the action block of the rotary and restore their state in
the supply function, is not working.
It seems that answer/data is common among ALL list rows - clicking on
any row will advance the common 'data list to the next slot, thus
answer/data is not individual(separate) amongst the list rows.
All seems to spurious to me: is the supply function Janus-faced, i.e.
represents "read" _and_ "write" states: I thought, that the action
block of the actual widget in a list could be used to store its state,
and the supply routine could read this state and redraw the screen
element accordingly. I thought, the kind of reinitialization I used
int the above is useful, but it seems, it is not :-(
--
Best regards,
Geza Lakner MD mailto:[geza67--freestart--hu]
