problem with gbutton

problem with gbutton

[Angela Zhu]

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Hi,

Can anyone give me an example how to set a GButton.button to be
insensitive or not according to a boolean value "isActive"?

-- 
Thanks,
Angela Zhu
------------------------------------------
Dept. of CS, Rice University
http://www.cs.rice.edu/~yz2/
------------------------------------------

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Re: [Caml-list] problem with gbutton

[Julien Moutinho]

On Fri, Nov 02, 2007 at 05:48:01PM -0500, Angela Zhu wrote:
> Can anyone give me an example how to set a GButton.button to be
> insensitive or not according to a boolean value "isActive"?

The method #misc#set_sensitive, used by a few examples
in the sources of LablGTK, and documented here:
  http://plus.kaist.ac.kr/~shoh/ocaml/lablgtk2/lablgtk-2.4.0/doc/html/GObj.misc_ops.html#METHODset_sensitive
may do the job:

% cat test.ml
let _ =
    let window = GWindow.window ()
      ~show: true in
    let button = GButton.button ()
      ~label: "hello"
      ~packing: window#add in
    let isActive = false in
    button#misc#set_sensitive isActive;
    ignore (window#connect#destroy
      ~callback: GMain.quit);
    GMain.main ()

% ocamlc -o test -I +lablgtk2 lablgtk.cma gtkInit.cmo test.ml
% ./test

HTH,
  Julien.

Re: [Caml-list] problem with gbutton

[Angela Zhu]

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I also want to add

      GMain.Idle.add ~callback:(fun () ->  true);

But I keep getting:

***********
Expecting function has type ?prio:int -> (unit -> bool) -> Glib.Idle.id
This argument cannot be applied with label ~callback

Any idea?

Thanks,
Angela



On 11/2/07, Julien Moutinho <julien.moutinho@gmail.com> wrote:
>
> On Fri, Nov 02, 2007 at 05:48:01PM -0500, Angela Zhu wrote:
> > Can anyone give me an example how to set a GButton.button to be
> > insensitive or not according to a boolean value "isActive"?
>
> The method #misc#set_sensitive, used by a few examples
> in the sources of LablGTK, and documented here:
>
> http://plus.kaist.ac.kr/~shoh/ocaml/lablgtk2/lablgtk-2.4.0/doc/html/GObj.misc_ops.html#METHODset_sensitive
> may do the job:
>
> % cat test.ml
> let _ =
>     let window = GWindow.window ()
>       ~show: true in
>     let button = GButton.button ()
>       ~label: "hello"
>       ~packing: window#add in
>     let isActive = false in
>     button#misc#set_sensitive isActive;
>     ignore (window#connect#destroy
>       ~callback: GMain.quit);
>     GMain.main ()
>
> % ocamlc -o test -I +lablgtk2 lablgtk.cma gtkInit.cmo test.ml
> % ./test
>
> HTH,
>   Julien.
>
> _______________________________________________
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> Bug reports: http://caml.inria.fr/bin/caml-bugs
>



-- 
Regards,
Angela Zhu
------------------------------------------
Dept. of CS, Rice University
http://www.cs.rice.edu/~yz2/
------------------------------------------

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Re: [Caml-list] problem with gbutton

[Julien Moutinho]

On Fri, Nov 02, 2007 at 10:20:24PM -0500, Angela Zhu wrote:
> I also want to add
> 
>       GMain.Idle.add ~callback:(fun () ->  true);
> 
> But I keep getting:
> 
> ***********
> Expecting function has type ?prio:int -> (unit -> bool) -> Glib.Idle.id
> This argument cannot be applied with label ~callback
> 
> Any idea?
As said by the error message, the signature of GMain.Idle.add is:
  ?prio:int ->      (* an optional argument: the priority  *)
  (unit -> bool) -> (* an anonymous argument: the callback *)
  Glib.Idle.id      (* the returned value: an identifier   *)
Here no argument of GMain.Idle.add has a label named "callback",
hence the error you get.

Instead do the following:
  let id = GMain.Idle.add (fun _ -> true) in

Also, there is a manual chapter on labels:
  http://caml.inria.fr/pub/docs/manual-ocaml/manual006.html

And by the way, do not forget that there is a mailing list
dedicated to LablGTK:
  http://yquem.inria.fr/cgi-bin/mailman/listinfo/lablgtk

HTH.

Re: [Caml-list] problem with gbutton

[Angela Zhu]

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It works.
Thanks!

-Angela

On 11/2/07, Julien Moutinho <julien.moutinho@gmail.com> wrote:
>
> On Fri, Nov 02, 2007 at 10:20:24PM -0500, Angela Zhu wrote:
> > I also want to add
> >
> >       GMain.Idle.add ~callback:(fun () ->  true);
> >
> > But I keep getting:
> >
> > ***********
> > Expecting function has type ?prio:int -> (unit -> bool) -> Glib.Idle.id
> > This argument cannot be applied with label ~callback
> >
> > Any idea?
> As said by the error message, the signature of GMain.Idle.add is:
>   ?prio:int ->      (* an optional argument: the priority  *)
>   (unit -> bool) -> (* an anonymous argument: the callback *)
>   Glib.Idle.id      (* the returned value: an identifier   *)
> Here no argument of GMain.Idle.add has a label named "callback",
> hence the error you get.
>
> Instead do the following:
>   let id = GMain.Idle.add (fun _ -> true) in
>
> Also, there is a manual chapter on labels:
>   http://caml.inria.fr/pub/docs/manual-ocaml/manual006.html
>
> And by the way, do not forget that there is a mailing list
> dedicated to LablGTK:
>   http://yquem.inria.fr/cgi-bin/mailman/listinfo/lablgtk
>
> HTH.
>
>


-- 
Regards,
Angela Zhu
------------------------------------------
Dept. of CS, Rice University
http://www.cs.rice.edu/~yz2/
------------------------------------------

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