Red []
view compose [
text (rejoin [{The sum of } figs: [1 2 3 4] { is: }])
answer: text {}
return
button "Push me to calculate" on-click [answer/text: to-string sum figs]
]
@9214 pointed you to Linux GTK builds of Red. My example was tested in macOS so haven't tried it on Linux but you'll need GTK & 32bit compatibility libraries installed for it to work.
The VID has changed a little bit over time. Here's the example in Rebol2 View...
Rebol []
view layout compose [
across
text (rejoin [{The sum of } figs: [1 2 3 4] { is: }])
answer: text {......}
return
button "Push me to calculate" 200x20 [
answer/text: to-string sum figs
show answer
]
]
And here it is in Rebol 3 / R3-GUI...
load-gui
view compose [
hgroup [
text (rejoin [{The sum of } figs: [1 2 3 4] { is: }])
answer: text {......}
return
button "Push me to calculate" on-click [
set-face answer to-string sum figs
]
]
]
Both scripts above worked fine on my Ubuntu 18 Linux.
NB. Rebol doesn't come with a SUM function so here's one defined...
sum: func [s /local total] [
total: 0
forall s [total: total + s/1]
total
]
TclTk is extremely cryptic. I used to code IVR scripts for Cisco access servers in early 20th, most of them still in use today. A couple of unsuccessful attempts were made to customize them by other people, but nobody (including me myself) knows how do they work. The art had been lost forever.
In comparison to many popular languages (e.g., Python, Java), to success with Tcl (not only about Tcl), one needs to be a real fan, because it's not about engineering, it's about passion and art
Here's the same code in Red VID...