RE: A question about radio button

["Dugas, Alan" <alan dugas analog com>]

I'm not aware of a single function that does this.  However, there are 2 ways of
gettting this information that I can think of using
gtk_toggle_button_get_active() - which returns TRUE if a button is active;

(1) connect to the "toggled" signal for each radio button and determine the
active button using "gtk_toggle_button_get_active( GTK_TOGGLE_BUTTON(
radio_button ) )" in your callback function.  Note: This is necessary because
the previously selected radio button emits the "toggled" signal when it
de-activates in addtion to the newly selected button emitting the "toggled"
signal when it activates.

(2) get a singly linked list (i.e. a GSList) of all the radio buttons in a
particular group using gtk_radio_button_group() and perform a check on each
button in the list until you find the active button using
"gtk_toggle_button_get_active( GTK_TOGGLE_BUTTON( radio_button ) )".

Hope this helps.



                                -- Stupid Genius
P.S.
a GSList is defined in glib.h as;

typedef struct _GSList GSList;

struct _GSList
{
        gpointer  data;         /* in this example data would be a radio button
*/
        GSList    *next;                /* a pointer to the next GSList in the
linked list or NULL if data is the last item in the linked list */
};

> ----------
> From:         Jiang[SMTP:jiangh1999 263 net]
> Reply To:     wildcrane chinaren com
> Sent:         Sunday, October 29, 2000 8:14 AM
> To:   GTK Application Development List
> Subject:      A question about radio button
>
> Hi, Everyone,
> I am a beginner in GTK. I  wonder whether there is some function that will
> tell which radio button is currently active in a group of radio button. Maybe
> that will need to follow through the linked list, but I am not clear about the
> operation of  GSList . Would you help me? 
> Thanks for your considerations!   
>
> -- 
>
>
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