[Glade-devel] callbacks

[taf2 lehigh edu (Todd Fisher)]

Al,
    You might be interested in trying a library called libglade.  When 
you use libglade all you need is
the xml (.glade) file generated by glade when you click the save 
button.  A typical libglade
application might look like:
static void callback(GtkWidget, GladeXML *xml );
int main( int argc, char **argv )
{
  GladeXML *xml;
  gtk_init(&argc, &argv );
  xml = glade_xml_new( "mygladefile.glade", 0, 0);
  glade_xml_signal_connect_data( xml, "mysignal-name-from-glade",
                                                    G_CALLBACK( callback 
), xml );
  gtk_main();
    return 0;
}
void callback(GtkWidget, GladeXML *xml )
{
// get the progress bar
   GtkWidget *progressbar = glade_xml_get_widget( xml, "progressbar" );
  // do what ever you want with the progress bar widget
}

libglade api: http://developer.gnome.org/doc/API/2.0/libglade/index.html

todd

Al wrote:

> Hi at all,
>
> i followed a discussion about the callbacks with glade in witch people speaks 
> about the possibility to change the inteface.c file, but i learned from the 
> glade tutorial... 
> http://www.kplug.org/glade_tutorial/glade2_tutorial/quick_tour2.html
>
> ...that i should not change that file, because it will be overwitten every 
> time glade builds the code of my application.
>
> I need a way to exchange pointers to widget between different callbacks 
> function. Is there a way without declaring a global variable?
>
> For example my actual callbacks.c is like this:
>
> /*Initialized in main.c with the pointer to the main window*/
> extern GtkWidget *Main;
> [...]
>
> void
> on_connectFileMenuButton_activate      (GtkMenuItem     *menuitem,
>                                        gpointer         user_data)
> {
>  GtkWidget *progress=lookup_widget(Main,"progressbar");
>  short int i;
>  gdouble fraction;
>  GtkWidget *connecting=create_Connecting();
>  for(i=0;i<=100;i++)
>    {
>      fraction=((gdouble)i)/100;
>      gtk_progress_bar_set_fraction(GTK_PROGRESS_BAR(progress),fraction);
>      sleep(0.9);
>    }
>  gtk_widget_show(connecting);
>
> }
>
>
> in this case i cannot obtain a pointer to the progressbar placed into the main 
> window, because the menuitem is a little window that contains: "File, Edit" 
> and so on... (therefore an approach like:   
> lookup_widget(menuitem,"progressbar"), or 
> lookup_widget(gtk_widget_get_toplevel(menuitem),"progressbar") does not 
> work).
> My problem will be addressed if i could pass data into 
> user_data variable, but i don't know how to do that without changing the 
> interface.c
> Can someone help me?
>
> Thanks 
>
> Alberto
>
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