Re: Gtk2::SpinButton with blank value

["Tadej Borovšak" <tadeboro gmail com>]

Hi,

maybe "output" signal may help. See here:
http://library.gnome.org/devel/gtk/stable/GtkSpinButton.html#GtkSpinButton-output


2008/11/13 muppet <scott asofyet org>:
>
> On Nov 10, 2008, at 3:19 PM, Jeffrey Ratcliffe wrote:
>
>> I'd like to set a Gtk2::SpinButton to a blank value in certain
>> situations.
>>
>> set_value() complains that "" isn't numeric, but Gtk2::SpinButton
>> inherits from Gtk2::Entry, so set_text() should work, but is simply
>> ignored (or possibly set, and updated to the nearest numeric value, as
>> happens when entering a blank value manually and hitting return).
>>
>> Is it doable?
>
>
> Looking at the C code in gtkspinbutton.c, i think you could override the
> GtkEditable's insert_text method with your own thing that allows you to slip
> a BlankableSpinButton into a "blank" state.
>
> But we don't have the infrastructure you need to implement your own
> overrides for Gtk2::Editable methods.
>
> D'oh.
>
> You could override the insert-text signal, but to get stuff to happen
> correctly, you'd either have to reimplement the whole thing from
> gtkspinbutton.c or chain up -- and in chaining up, you bump into a
> deficiency of Glib::Object::signal_chain_from_overridden(), namely that it
> doesn't know how to unmarshal the stuff we give to custom signal marshalers.
>  In other words, we crash.
>
> Double d'oh.
>
>
> So, without binding work, no, not doable by "clean" methods.
>
> You could do dirty stuff like hook into focus-out and prevent it restoring
> the numeric value, but that'll be tedious and fragile.
>
>
> The obvious question is, why do you want to do this?  What are these certain
> situations?  Maybe there's another solution that doesn't involve hackery
> here...
>
>
> --
> Teeter tots are shaped like marshmallows.
>  -- Zella.
>
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