[Haskell-cafe] Problem with Gtk2hs

[Stefan O'Rear]

On Sat, Dec 08, 2007 at 08:33:36PM +0000, Andrew Coppin wrote:
> I just spent the evening writing a library that's a thin layer over Gtk2hs. 
> It took an age to get it to compile, but eventually it worked. Yay!
>
> When I ran it, I got this:
>
> Test2: gtk/Graphics/UI/Gtk/Gdk/PixbufData.hs.pp:58:0: No instance nor 
> default method for class operation Data.Array.Base.getNumElements
>
> Er... wow.
>
> OK, at this point, I am completely stumped. Any hints?

That's pretty obviously a bug - Graphics.UI.Gtk.Gdk.PixbufData doesn't
fully implement the (M)Array class.

> (Also, the documentation for Graphics.UI.Gtk.Misc.DrawingArea suggests that 
> you may want to draw a Pixbuf using the pixbufRenderToDrawable function - 
> but GHC complains that this function doesn't exist. I had to use drawPixbuf 
> instead. Wow that has a lot of parameters... In particular, the final two 
> don't seem to be documented. Interesting. They're both 0 in the "fastdraw" 
> demo.)

Stefan
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