[Haskell-cafe] Problem with Gtk2hs
stefanor at cox.net
Sat Dec 8 16:08:22 EST 2007
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"
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