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Today's Topics:
1. Re: help with type error in a wxHaskell program (Kim-Ee Yeoh)
2. Re: help with type error in a wxHaskell program (Jason J. Corso)
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Message: 1
Date: Sun, 22 Nov 2015 10:52:13 +0700
From: Kim-Ee Yeoh <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: Re: [Haskell-beginners] help with type error in a wxHaskell
program
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<capy+zdtqzhcof+zwy42jnrxqq7azmxl_kzqxl2xzbb3prfp...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
On Sat, Nov 21, 2015 at 8:28 PM, Jason J. Corso <[email protected]>
wrote:
> But, I get a type error that I do not understand
>
> Couldn't match expected type ?IO (Window a0)?
> with actual type ?[Prop (Frame ())] -> IO (Frame ())?
> Probable cause: ?frame? is applied to too few arguments
>
This is a consequence of the line "f <- frame" in
gui :: IO ()
gui = do
f <- frame
let s = map (\t -> staticText f [text := show t]) [1..10]
set f [layout := margin 10 ( row 2 $ map (\x -> (widget x)) s)]
I have no experience at all with wxHaskell. But for the sake of forward
motion, substituting with "f <- frame []" should work.
-- Kim-Ee
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Message: 2
Date: Sun, 22 Nov 2015 06:37:02 -0500
From: "Jason J. Corso" <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: Re: [Haskell-beginners] help with type error in a wxHaskell
program
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Thank you both for the help. There was another mistake after this
piece. The let s = map... led to a [IO (StaticText())] and it had to
be changed as below. The below code works. Thanks again.
module Main where
import Graphics.UI.WX
main :: IO ()
main
= start gui
gui :: IO ()
gui = do
f <- frame [text := "First Fix!"]
ss <- mapM (\t -> staticText f [text := show t]) [1..10]
set f [layout := margin 10 ( row 2 $ map (\x -> (widget x)) ss)]
Jason
On Sat, Nov 21, 2015 at 10:52 PM, Kim-Ee Yeoh <[email protected]> wrote:
>
> On Sat, Nov 21, 2015 at 8:28 PM, Jason J. Corso <[email protected]>
> wrote:
>>
>> But, I get a type error that I do not understand
>>
>> Couldn't match expected type ?IO (Window a0)?
>> with actual type ?[Prop (Frame ())] -> IO (Frame ())?
>> Probable cause: ?frame? is applied to too few arguments
>
>
> This is a consequence of the line "f <- frame" in
>
> gui :: IO ()
> gui = do
> f <- frame
> let s = map (\t -> staticText f [text := show t]) [1..10]
> set f [layout := margin 10 ( row 2 $ map (\x -> (widget x)) s)]
>
> I have no experience at all with wxHaskell. But for the sake of forward
> motion, substituting with "f <- frame []" should work.
>
> -- Kim-Ee
>
> _______________________________________________
> Beginners mailing list
> [email protected]
> http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
>
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