Re: How to copy data between widgets?

["RomÃn Gorojovsky" <rgorojovsky gmail com>]

On 8/8/06, Michael L Torrie <torriem chem byu edu> wrote:
> On Tue, 2006-08-08 at 11:48 -0300, RomÃn Gorojovsky wrote:
> > As I said before, It's a problem with my C, not my gtk.  A quite
> > embarrassing mistake, sorry for wasting your time.
>
> Another way to do it is to assign each widget a string name using
> g_object_set_data.  Once this is set, then in your callback you can use
> the emitting-object's GtkWidget pointer to lookup the parent widget and
> then search down the widget hiearchy for the named label widget.

Ah! this is another thing that I wanted to know, how to follow the
widget hierarchy.  The example is good enough, thanks.

> Glade-generated code (which is of course deprecated but demonstrates
> this solution) does this:
>
> #define GLADE_HOOKUP_OBJECT(component,widget,name) \
>   g_object_set_data_full (G_OBJECT (component), name, \
>     gtk_widget_ref (widget), (GDestroyNotify) gtk_widget_unref)
>
> #define GLADE_HOOKUP_OBJECT_NO_REF(component,widget,name) \
>   g_object_set_data (G_OBJECT (component), name, widget)
>
>
>
> GtkWidget*
> lookup_widget                          (GtkWidget       *widget,
>                                         const gchar     *widget_name)
> {
>   GtkWidget *parent, *found_widget;
>
>   for (;;)
>     {
>       if (GTK_IS_MENU (widget))
>         parent = gtk_menu_get_attach_widget (GTK_MENU (widget));
>       else
>         parent = widget->parent;
>       if (!parent)
>         parent = (GtkWidget*) g_object_get_data (G_OBJECT (widget),
> "GladeParentKey");
>       if (parent == NULL)
>         break;
>       widget = parent;
>     }
>
>   found_widget = (GtkWidget*) g_object_get_data (G_OBJECT (widget),
>                                                  widget_name);
>   if (!found_widget)
>     g_warning ("Widget not found: %s", widget_name);
>   return found_widget;
> }
>
> GtkWidget*
> create_window1 (void)
> {
>   GtkWidget *window1;
>   GtkWidget *vbox1;
>   GtkWidget *label;
>   GtkWidget *entry;
>   GtkWidget *button;
>
>   window1 = gtk_window_new (GTK_WINDOW_TOPLEVEL);
>   gtk_window_set_title (GTK_WINDOW (window1), _("window1"));
>
>   vbox1 = gtk_vbox_new (FALSE, 0);
>   gtk_widget_show (vbox1);
>   gtk_container_add (GTK_CONTAINER (window1), vbox1);
>
>   label = gtk_label_new (_("label1"));
>   gtk_widget_show (label);
>   gtk_box_pack_start (GTK_BOX (vbox1), label, FALSE, FALSE, 0);
>
>   entry = gtk_entry_new ();
>   gtk_widget_show (entry);
>   gtk_box_pack_start (GTK_BOX (vbox1), entry, FALSE, FALSE, 0);
>
>   button = gtk_button_new_with_mnemonic (_("button1"));
>   gtk_widget_show (button);
>   gtk_box_pack_start (GTK_BOX (vbox1), button, FALSE, FALSE, 0);
>
>   /* Store pointers to all widgets, for use by lookup_widget(). */
>   GLADE_HOOKUP_OBJECT_NO_REF (window1, window1, "window1");
>   GLADE_HOOKUP_OBJECT (window1, vbox1, "vbox1");
>   GLADE_HOOKUP_OBJECT (window1, label, "label");
>   GLADE_HOOKUP_OBJECT (window1, entry, "entry");
>   GLADE_HOOKUP_OBJECT (window1, button, "button");
>
>   return window1;
> }
>
>
> This is somewhat arbitrary, and you could use your own method for doing
> the names and searching.  I've found this type of thing to work very
> well.
>
> Michael
>
>
> >
> > Thanks a lot again.
> >
> > > Cheers,
> > >                     -Tristan
> > >
> >
> >


--
RomÃn