Function update

pub fn update<'a, S: AsRef<str> + Send + Sync + Clone + 'static, Message: Clone + 'static, AppMessage: Clone + 'static>(
    event: &Event,
    layout: Layout<'_>,
    cursor: Cursor,
    shell: &mut Shell<'_, Message>,
    on_selected: Arc<dyn Fn(usize) -> Message + Send + Sync + 'static>,
    selected: Option<usize>,
    selections: &[S],
    state: impl FnOnce() -> &'a mut State,
    _window_id: Option<Id>,
    on_surface_action: Option<Arc<dyn Fn(Action) -> Message + Send + Sync + 'static>>,
    action_map: Option<Arc<dyn Fn(Message) -> AppMessage + Send + Sync + 'static>>,
    icons: &[Handle],
    gap: f32,
    padding: Padding,
    text_size: Option<f32>,
    font: Option<Font>,
    selected_option: Option<usize>,
) -> Status

Processes an Event and updates the State of a Dropdown accordingly.