This is an illustration of how to integrate a GUI library (in this case gi-gtk)
into dunai,
using bearriver for arrowised FRP.
Though still at a prototype stage it already provides a very convenient way to write programs,
e.g. the following simple counter:
main :: IO ()
main = runGUI $ proc () -> do
-- set up buttons
(up, upBtn) <- button "Up" -< ()
(down, downBtn) <- button "Down" -< ()
-- compute value and display it
value <- accumBy (flip ($)) (0::Int) -< lMerge ((+1) <$ up) (subtract 1 <$ down)
valueDisplay <- entry -< T.pack . show <$> value
-- layout widgets in boxes
btnBox <- box Gtk.OrientationVertical -< updated $ sequenceA
[ (,True,True,0) . Some <$> upBtn
, (,True,True,0) . Some <$> downBtn
]
windowBox <- box Gtk.OrientationHorizontal -< updated $ sequenceA
[ (,False,False,0) . Some <$> entryWidget valueDisplay
, (,True ,True ,0) . Some <$> btnBox
]
arr updated -< windowBox
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent