gtk:notebook-tab-detachable (notebook child)

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

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

Note that two notebooks must share a common group identifier, see the gtk:notebook-group-name function, to allow automatic notebook tabs interchange between them.

If you want a widget to interact with a notebook through DnD, that is, accept dragged notebook tabs from it, it must be set as a drop destination by adding to it a gtk:drop-target controller that accepts the GType "GtkNotebookPage". The :value value of said drop target will be preloaded with a gtk:notebook-page object that corresponds to the dropped notebook tab, so you can process the value via "accept" or "drop" signals.

Note that you should use the gtk:notebook-detach-tab function instead of the gtk:notebook-remove-page function if you want to remove the notebook tab from the source notebook as part of accepting a drop. Otherwise, the source notebook will think that the dragged tab was removed from underneath the ongoing drag operation, and will initiate a drag cancel animation.

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

static void
on_drag_data_received (GtkWidget        *widget,
                       GdkDrop          *drop,
                       GtkSelectionData *data,
                       guint             time,
                       gpointer          user_data)
{
  GtkDrag *drag;
  GtkWidget *notebook;
  GtkWidget **child;


  drag = gtk_drop_get_drag (drop);
  notebook = g_object_get_data (drag, "gtk-notebook-drag-origin");
  child = (void*) gtk_selection_data_get_data (data);


  // process_widget (*child);


  gtk_notebook_detach_tab (GTK_NOTEBOOK (notebook), *child);
}