gtk:notebook-tab-detachable (notebook child)

notebook -- a gtk:notebook widget
child -- a gtk:widget child page
detachable -- a boolean whether the tab is detachable or not

The gtk:notebook-tab-detachable function returns whether the tab content can be detached from the notebook to another notebook or widget. The (setf gtk:notebook-tab-detachable) function sets whether the tab can be detached.

Note that two notebooks must share a common group identificator, see the gtk:notebook-group-name function, to allow automatic tabs interchange between them. If you want a widget to interact with a notebook through DnD, that is accept dragged tabs from it, it must be set as a drop destination and accept the "GTK_NOTEBOOK_TAB" target. The notebook will fill the selection with a GtkWidget** pointing to the child widget that corresponds to the dropped tab.

static void
on_drop_zone_drag_data_received (GtkWidget        *widget,
                                 GdkDragContext   *context,
                                 gint              x,
                                 gint              y,
                                 GtkSelectionData *selection_data,
                                 guint             info,
                                 guint             time,
                                 gpointer          user_data)
{
  GtkWidget *notebook;
  GtkWidget **child;


  notebook = gtk_drag_get_source_widget (context);
  child = (void*) gtk_selection_data_get_data (selection_data);


  process_widget (*child);
  gtk_container_remove (GTK_CONTAINER (notebook), *child);
}    

If you want a notebook to accept drags from other widgets, you will have to set your own DnD code to do it.