Re: GtkNotebook and callback

[Arno <dark-arno ifrance com>]

TORRI Vincent wrote:

> On Sun, 17 Nov 2002, Arno wrote:
>
>  
>
> > Hello,
> >
> > I make a callback on my GtkNotebook :
> > g_signal_connect (G_OBJECT (notebook), "switch_page",
> >            G_CALLBACK (notebook_changed_cb),
> >            NULL);
> >
> > And in my fonction I do :
> > notebook_changed_cb (GtkNotebook *notebook, GtkNotebookPage *page,
> >             guint numero_page, gpointer data)
> > {
> >  const gchar *text;
> >
> >  text = gtk_notebook_get_menu_label_text(notebook, GTK_WIDGET(page));
> >    
>
> You have to pass the child of your page, not page itself (a 
> GtkNotebookPage is not a GtkWidget). You can get the child of your current 
> page with
>
>  GtkWidget *child;
>  child = gtk_notebook_get_nth_page (notebook, 
> gtk_notebook_get_current_page (notebook));
>  
Thank you. I didn't know how I could get the child.

> >  printf("Label: %s\n", text);
> > }
> >
> > But I have a little pb when I use this solution:
> > (check_tsr:592): GLib-GObject-WARNING **: invalid uninstantiatable type 
> > `(null)' in cast to `GtkWidget'
> >
> > (check_tsr:592): Gtk-CRITICAL **: file gtknotebook.c: line 4905 
> > (gtk_notebook_get_menu_label_text): assertion `GTK_IS_WIDGET (child)' failed
> > Label: (null)
> >
> >
> > It said that it could cast my GtkNotebookPage to a widget. So I search 
> > in the code source and I do this :
> >
> > struct _GtkNotebookPage
> > {
> >  GtkWidget *child;
> >  GtkWidget *tab_label;
> >  GtkWidget *menu_label;
> >  GtkWidget *last_focus_child;    /* Last descendant of the page that 
> > had focus */
> >
> >  guint default_menu : 1;    /* If true, we create the menu label ourself */
> >  guint default_tab  : 1;    /* If true, we create the tab label ourself */
> >  guint expand       : 1;
> >  guint fill         : 1;
> >  guint pack         : 1;
> >
> >  GtkRequisition requisition;
> >  GtkAllocation allocation;
> >
> >  guint mnemonic_activate_signal;
> > };
> >
> > void
> > notebook_changed_cb (GtkNotebook *notebook, GtkNotebookPage *page,
> >             guint numero_page, gpointer data)
> > {
> >  const gchar *text;
> >
> >  printf("Page: %p,   Child:%p\n", page, page->child);
> >  printf("Diff: %d\n", (int)page->child - (int)page);
> >  text = gtk_notebook_get_menu_label_text(notebook, 
> > GTK_WIDGET(page->child));
> >  printf("Label: %s\n", text);
> > }
> >
> > And I obtain :
> >
> > Page: 0x80c8e00,   Child:0x80c8be8
> > Diff: -536
> > Label: List of packets
> >
> >
> > With this solution I obtain the name of the current menu but I need to 
> > copy the struct _GtkNotebookPage from the source to my project. I don't 
> > think that it's the good solution. So if you could help me. I use GTK2.
> >
> > Also, I don't understand why (int)page->child - (int)page) equal to -536
> >    
>
> What kind of result would you want to have ? You compute the difference of 
> two adresses, so the result could be (almost) every number, I think.
>  

Yes, in fact I don't know :)

> regards
>
> Vincent TORRI
>
>  
>
> > Thx ;)
> > Arno
> >
> >
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> >
> >    
>
>  




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