Thanks. I just added the export to Widget and manually compiled it here. I also changed the type definition of EventM as pointed out in an earlier message I sent. This bug is still present in the current version of gtk2hs. To elaborate: With the current definition of EventM
type EventM t a = ReaderT (Ptr t) IO a it is impossible to use (EventM t) as an argument to a monad transformer, e.g. type EventMWithState t a = StateT MyState (EventM t) a. There are two ways to make this possible. Either EventM becomes a newtype, along with the necessary boilerplate. That's probably not necessary here. The second option is to define type EventM t = ReaderT (Ptr t) IO. This allows (EventM t) to be combined with monad transformers. Cheers, Norbert On Thu, Oct 30, 2014 at 3:32 AM, Axel Simon <axel.si...@in.tum.de> wrote: > Hi Norbert, > > On 29.10.2014, at 22:37, Norbert Zeh <n...@cs.dal.ca> wrote: > > > Hi folks, > > > > I just tried to connect to the sizeAllocate signal of the Widget type, > but the type of this signal is Signal self (Allocation -> IO ()). Thus, > the function I provide as an argument needs to take an Allocation as an > argument, but I cannot declare a function of this type because Allocation > seems to be only exported by the hidden module > Graphics.UI.Gtk.General.Structs. Any advice on how to react to > sizeAllocate signals? > > > > Well, it’s a bug, it should be exported from Widget. However, it’s only a > type synonym to Rectangle which is public, so using the Rectangle > constructor should be possible. > > Cheers, > Axel > > > Thanks, > > Norbert > > > ------------------------------------------------------------------------------ > > _______________________________________________ > > Gtk2hs-devel mailing list > > Gtk2hs-devel@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/gtk2hs-devel > >
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