Re: modifiable dialog button labels?

[Lance Dillon <riffraff169 yahoo com>]

> ________________________________
> From: Roger Davis <rbd soest hawaii edu>
> To: Lance Dillon <riffraff169 yahoo com> 
> Cc: "gtk-app-devel-list gnome org" <gtk-app-devel-list gnome org> 
> Sent: Thursday, March 8, 2012 2:07 AM
> Subject: Re: modifiable dialog button labels?
>
>
>
> On Wed, 7 Mar 2012, Lance Dillon wrote:
>
> > you can use gtk_get_action_area() to get the GtkBox that that is the action
> > area, that itself contains the buttons.  I believe you can then get all the
> > child widgets, which would be the GtkButtons.
> >
> > The  docs for GtkDialog describes it some, but doesn't talk about getting the
> > buttons.  I think you would have to go to the page for GtkBox for how to get
> > the children.
>
> Hi Lance,
>
> The GtkDialog documentation tells only how to access the action area, not its children. Searching around I 
> see a gtk_container_get_children() which presumably returns a list of GtkWidget pointers. Is there a way I 
> can look at a widget pointer and detrmine the widget's type, i.e., figure out whether or not it's a button? 
> I see references to a gtk_widget_get_type() on the web, but no good examples of how it's used, and it 
> appears to be not present at all in my own GTK release's GtkWidget documentation. There also seem to be some 
> related type discovery functions in the gobject library such as g_type(), etc., but so far I have not found 
> any useful examples of how I might use them to figure out if any particular widget pointer is a button or 
> not.
>
> Thanks,
>
> Roger
>
> You would then use g_type_is_a() (possibly), perhaps with G_TYPE_FROM_INSTANCE and g_type_from_name():

GList *g,*g1;
g1=g=gtk_container_get_children(GTK_CONTAINER(gtk_dialog_get_action_area(dialogbox)));

while(g1);

if (g_type_is_a(G_TYPE_FROM_INSTANCE(g1->data),g_type_from_name("GtkButton"))) {
  /* do something with button */
  g1=g_list_next(g1);
}

g_list_free(g);



You can of course create the dialog without buttons with gtk_dialog_new(), then add buttons manually with 
gtk_dialog_add_button(), and save the return value which is the widget, then change the labels on the 
buttons  when you need to.  That may be easier than the above:

GtkWidget *d;
d=gtk_dialog_new();
GtkButton *b1,*b2;
b1=gtk_dialog_add_button(GTK_DIALOG(d),"Wine",1);
b2=gtk_dialog_add_button(GTK_DIALOG(d),"Beer",2);

Then do your gtk_dialog_run() later.  Then when you need to change the values, you can just do 
gtk_button_set_label(b1,"Dog"); gtk_button_set_label(b2,"Cat"), then reshow your dialog and gtk_dialog_run() 
again.