[Haskell-cafe] wxHaskell not in scope

[Lennart Augustsson]

Variables bound in the do block are not in scope in the where.
Use a let inside the do for onOpen instead.

On Thu, Apr 16, 2009 at 11:53 PM, Tsunkiet Man <temp.tsun at gmail.com> wrote:
> Hello,
>
> I'm trying to create a GUI by using wxHaskell. However I get the weird error
> message of "Not in scope "dt"", well so I sorted them so that my so called
> "dt" was in scope, however it failed. Can someone please tell me how I can
> solve this error?
>
>            ... A lot of code that is not relevant in my opinion, if I'm
> wrong please correct me and I will post my full code
>
>             --Debug text --
>             dt <- staticText f [text := "Hello world!"]
>
>             imagePanel <- panel f [position := Point 2 2, clientSize := Size
> 100 100, tooltip := "This is a drawPanel", bgcolor := rgb 255 255 255]
>             set f [ clientSize := Size 700 500,
>                     menuBar := [mFile, mHelp],
>                     visible := True,
>                     on (menu exit) := close f,
>                     on (menu open) := onOpen f vFile ]
>
>
>             return ()
>
>             where
>                 onOpen :: Frame a -> Var b -> IO ()
>                 onOpen frame var = do   file <- fileOpenDialog frame False
> True "Open File" [("PGM bestanden (*.pgm)",["*.pgm"]),("Alle bestanden
> (*.*)",["*.*"])] "" ""
>                                         case file of
>                                             Nothing ->      return ()
>                                             Just file ->    set dt [text :=
> "HELLO"]
>                                                             return ()
>
> Thank you for your help, I really owe haskell-cafe.
>
> Greetings Tsunkiet Man
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>