[Haskell-cafe] wxHaskell: convenience functions

[Mark Carter]

Actually, I can see how my requirement of not wanting to pass in cbEdit 
might not be so good. From an FP point of view, that's just asking for 
trouble. A better solution would appear to be to put the cbEdit in as a 
parameter, and just face the fact that all callers will be required to 
pass an extra parameter.

Mark Carter wrote:

>
>
> I'm experimenting with wxHaskell, and I've got something like:
>
> main = run mainFrame
>
> mainFrame = do -- main application frame
>    ...
>    cbEdit <- checkBox p1 [text := "Edit Mode",  on command ::=  
> onCbEdit textlog]
>    ...
>  where
>    ...
>
> It would be useful to have some convenience function, let's say, 
> isEditing, which works out whether cbEdit is checked, or not. That 
> way, one could just pass this in as a parameter without requiring any 
> extra code. The problem is, I can't see how it can be done. I've tried 
> various things in the main section, and nothing worked. I tried 
> putting the following defintion into the where clause:
>
>    isEditing = do
>        checkedp <- get cbEdit checked
>        return checkedp
>
> but the compiler complained that cbEdit is not in scope. I /could/ 
> pass in cbEdit as a parameter to isEditing, but I'd rather not.
>
>
>        
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