I'm trying to create my first "real program" in haskell (something that solves integrals if polynomials) but I'm completely stumped with this part of it:
I want to make something very simple a bit like GHCi:
> user input
program output
> user input
program output
> user input
program output
>
except that my program output is images (using LaTeX to turn mathematical expressions into PNGs) - so I can't do this using System.IO. I think it will be possible with gtk2hs which I've managed to install but I can't figure out how to make this input/output dialogue.
Please show me how it's done if you have the time. Thanks a lot!
We managed to come up with the following solution, thanks to ClaudiusMaximus.
module Main where
import Graphics.UI.Gtk
main = do
initGUI
----------------
win <- windowNew
onDestroy win mainQuit
vb <- vBoxNew False 3
log <- vBoxNew False 2
sc <- scrolledWindowNew Nothing Nothing
scrolledWindowSetPolicy sc PolicyNever PolicyAutomatic
sw <- layoutNew Nothing Nothing
en <- entryNew
----------------
scrolledWindowAddWithViewport sc log
boxPackStart vb sc PackGrow 0
boxPackStart vb en PackNatural 0
set win [ containerChild := vb ]
en `onEntryActivate` do
txt <- entryGetText en
entrySetText en ""
l <- labelNew (Just txt)
boxPackStart log l PackNatural 0
widgetShowAll log
Just ran <- scrolledWindowGetVScrollbar sc
adj <- rangeGetAdjustment ran
max <- adjustmentGetUpper adj
adjustmentSetValue adj max
----------------
widgetShowAll win
mainGUI