Use of gtk spin buttons [WAS Re: Margins Plugin Bug]

[Olivier Fourdan]

Oh..., and I almost forgot. You need to #include <math.h> since you use
ceil() and floor()

Cheers,
Olivier.

On Sun, 2003-03-30 at 16:37, Olivier Fourdan wrote:
> On Wed, 2003-03-26 at 09:43, Jasper Huijsmans wrote:
> > Yeah, this is a gtk bug. Spinbuttons don't update their value properly
> > when using the keyboard. Nothing we can do about it, I'm afraid. I
> > didn't check if the gtk people know about it, though (yeah, I'm lazy).
> 
> No it's not. It's a bug in your code :P
> 
> The correct way to get value changes is to connect a "value_changed"
> event to the spin adjustment, something like :
>    
> g_signal_connect(G_OBJECT(gtk_spin_button_get_adjustment(GTK_SPIN_BUTTON(spin))), "value_changed", G_CALLBACK(a_callback), a_pointer);
> 
> This, obviously , changes the callback function since the widget is now
> a GtkAdjustment (and not a GtkSpin anymore).
> 
> The (int) value can then be retrieved with :
> 
>     val = gtk_adjustment_get_value(GTK_ADJUSTMENT(widget));
>     if (val - floor (val) < ceil (val) - val)
>     {
>         n = floor (val);
>     }
>     else
>     {
>         n = ceil (val);
>     }
> 
> Humm, and yes, that probably needs to be fixed elsewhere (in
> xfce4-panel, maybe :). I just fixed the margin plug-in for now.
> 
> Cheers,
-- 
Olivier Fourdan <fourdan at xfce.org>
http://www.xfce.org