Called when drag starts into down direction

drag,start,down: Efl.Object;

EFL_UI_EVENT_DRAG_START_DOWN(Efl_Object *)

static void
on_efl_ui_event_drag_start_down(void *data, const Efl_Event *event)
{
    Efl_Object *info = event->info;
    Eo *obj = event->object;
    Data *d = data;
 
    /* event hander code */
}
 
static void
setup_event_handler(Eo *obj, Data *d)
{
    efl_event_callback_add(obj, EFL_UI_EVENT_DRAG_START_DOWN, on_efl_ui_event_drag_start_down, d);
}