[Haskell-cafe] How to use clipboard in Gtk2Hs
I'm making a text editor with Gtk2Hs, and I want to implement copy paste with TextView. I read the api document but I can't find how to use the Gtk.Clipboard object. Without context menu basically included in the TextView widget, How can I implement copy paste? ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Deferred instance declarations (context without type variables)
hello, I have a question about context in type signature. I would like to write a function, say (f :: T - T) which also relies on an instance of class C being defined for T. The problem is, I don't want this instance defined at the same time f is defined, instead I would like to defer this definition until f is called (in some other module). Naively the code would look like this: = module DefineF where class C a where fC :: a - a data T = T f :: (C T) = T - T f T = fC T = module CallF where instance C T where fC = id call = f T = The definition of f in DefineF won't compile because All of the type variables .. are already in scope. Could you recommend any other way to achieve what I am trying to do? An interesting thing is that I can easily make the code compile with the same meaning by changing the declaration of T to include a dummy type variable: data T a = T it's just a pity that I have to trick the compiler in such an ugly way. Cheers, Misha ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] How to use clipboard in Gtk2Hs
On Sat, 2006-09-16 at 18:32 +0900, Yu, Jae-Myoung wrote: I'm making a text editor with Gtk2Hs, and I want to implement copy paste with TextView. I read the api document but I can't find how to use the Gtk.Clipboard object. Without context menu basically included in the TextView widget, How can I implement copy paste? Btw, it's best to ask Gtk2Hs questions on the Gtk2Hs users list: [EMAIL PROTECTED] The copy paste for TextView works with the normal keybindings, eg ctl-c/ctl-v/ctl-x (or any other custom ones that have been setup). To do manual or custom clipboard stuff needs the Clipboard object which we have not bound yet. If that's a priority for you we can have a go at binding that before the upcoming Gtk2Hs 0.9.11 release. If you want it to help then we'll gladly accept patches via darcs send. Duncan ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Serialising types with existential data constructors
Klaus Ostermann and I allude to this non-trivial extensibility problem in our GPCE 2006 paper and we started to look into ways (not in that paper) to resolve the problem in a principled way. I'm really looking forward to that! For now I'll probably use Template Haskell to register all instances that have to be serialized and output the mapping head-type in the end. Cheers, Misha ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
