Re: Obtaining current value from a GtkHscale

[Ben Johnson <ben blarg net>]

On Fri, Jul 22, 2005 at 05:11:53PM -0500, Douglas Vechinski wrote:
> On Fri, 2005-07-22 at 13:31 -0700, Ben Johnson wrote:
> > On Fri, Jul 22, 2005 at 02:02:15PM -0500, Douglas Vechinski wrote:
> > > 
> > > I've been searching the GTK API trying to figure out what is probably a
> > > simple question.  How do I get the current value from a GtkHscale scale
> > > bar?
> > 
> > When I'm having trouble finding a function I need for a given widget,
> > especially when the need for such a function seems obvious, I start
> > looking at what the widget is a subclass of.  that's what you need to do
> > in this case.  I think gtk_range_get_value() is what you're looking for.
> > 
> > - Ben
> 
> But this still requires knowing the associated GtkRange pointer.  As I

a GtkHScale "is a" GtkRange.  maybe you need to learn more about object
orientation?  check out the object hierarchy:

  GObject
   +----GtkObject
         +----GtkWidget
               +----GtkRange
                     +----GtkScale
                           +----GtkHScale

GtkHScale is subclassed from GtkScale, which is subclassed from
GtkRange, which is subclassed from...  blah blah blah.  That means you
can treat a valid GtkHScale* as a valid GtkRange*.

GtkWidget* p = gtk_hscale_new_with_range (0, 100, 1);
gtk_widget_show( p );
printf("%f\n", gtk_range_get_value(GTK_RANGE(p)) );

as for getting the pointer to GtkHScale, look for information about
lookup_widget().  you should see it used in Glade tutorials.

- Ben