Re: [wxhaskell-users] how to make custom controls?

[Conal E. <co...@co...>]

Thanks much for the pointers, Mads.  I read the binview source code, which
uses a global mutable table to store per-instance data.  I wonder if there'=
s
a nicer way.  did you ever find one?  - Conal

On Nov 28, 2007 9:47 AM, Mads Lindstr=F8m <mad...@ya...> wrote:

> Hi
>
> Conal Elliott wrote:
> > I want to make (or find) a float-valued slider that displays its
> > current value and maybe its bounds.  Does anyone have advice about
> > doing that sort of thing.  I want the result to have have a
> > control-like interface, including a gettable attribute for the current
> > (float) value.  Thanks,  - Conal
>
> To have a gettable attribute you need to make the type containing the
> slider an instance of Valued. See
> http://wxhaskell.sourceforge.net/doc/Graphics.UI.WX.Classes.html#t%
> 3AValued and:
>
> import qualified Graphics.UI.WX as Wx
>
> instance Wx.Valued YourTypeContainingTheSlider where
>    value =3D Wx.newAttr "Value" ioActionToGetValue ioActionToSetValue
>
> there is also other classes you can make your type an instance of. See
> the link above. You should properly make it an instance of Widget as a
> minimum.
>
> I also asked about something similar before. I got this reply
>
> http://www.mail-archive.com/wxh...@li.../msg0026=
0.html.
>
>
> Greetings,
>
> Mads Lindstr=F8m
>
>
>