Red updating text in VID using reactive method - 


red [needs: 'view]  num: ["1^/"] k: num/1  view [      size 600x600      txt: text 30x50 k      ar: area 300x400 "" focus on-change[          txt/size: ar/size          len: length? split face/text newline          either (len - face/data) > 0 [                append num append form (len + 1) newline                face/data: len          ][                remove tail num                face/data: face/data - 1            ]           txt/text: form num      ]      [ar/data: 0] ]

this red program contains "text face" , "area face". text face contains vertical list of serial numbers. when newline added in area face, serial number increase per number of lines. , when line removed in area face, serial number decrease well.

this using non-reactive method. there reactive approach it?

i believe we're looking react function. reactive framework introduced in this blog post , there similar example of converting example using on-change reactive version.

anyhow, reading lot lately red, , looking first exercise; to-list implementation improved probably, view declaration more compact now:

red [needs: 'view]  to-list: function [text][     ; converts text area string list of numbers separated newlines     txt: copy text     append txt "dummy" ; handle empty lines     len: length? split txt newline     x: copy ""     repeat len [ append x mold append x newline] ]  view [      size 600x600      text 30x600 react [         face/text: to-list text-area/text     ]     text-area: area 300x400 "" ]

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