Re: [glade--]radiobutton "clicked" signal handler

[Christof Petig <christof petig-baender de>]

Syed Sajjad Lateef wrote:
> On Wed, 29 May 2002, Christof Petig wrote:
>
>
> > Syed Sajjad Lateef wrote:
> >
> > > 1. I would like only B's signal handler called when B is clicked. I don't
> > > want to have the signal handler for A called. How can I do this?
> >
> > Please ask on the gtkmm mailing list and then tell me, too. I'd love to 
> > know myself, but didn't find the time to ask or investigate.
>
>
> Thanks, Christof. And, Thank You, for creating and maintaining glademm. 
>
> After further investigation, I created a separate Gtk::RadioButton::Group 
> object for each radio button. This ensured that the signal for each radio 
> button was sent only to that button.

You seem to be looking for a checkbutton. checkbuttons don't have 
groups. Perhaps even a button will fit your needs (a button has no 
state: active/inactive aka pressed in, released out).

> Initially, I tried assigning 'user_data' to each button and then accessing
> the 'user_data' from each callback function. I was hoping that only the 
> user_data for the button that was clicked would be sent to both buttons. 
> But, no, different user_data (corresponding to each button) was sent to 
> those buttons. 

Of course, data belongs to a connect and is only sent to that callback.

> I realize that this is a non-standard way of using the radio button. But,
> I need circular "active" areas for an imagemap. Until I can figure out a
> way to do an imagemap correctly in Gtk--/glademm, I am using the circular
> radiobuttons to define the active areas of the imagemap (therefore, a
> different theme would not be of much help).

I think using an image (there is danger with glade-1: you can't assign a 
file. And there are problems with gtkmm1.2: I wasn't able to load a xpm 
into an image with three or four lines of code and finally gave up - not 
too interesting once gtkmm-2 support works well.) and connecting to 
button press/button_release (event.x and event.y tell you the relative 
position) would the way to go.

 Yours
    Christof