button_bind_closure.rs

let generate_button = Button::new_with_label("Generate spiral");

generate_button.connect_clicked(clone!(
        box_vert, image_gtk, spiral => move |_| {

    // Remove existing image from layout box
    box_vert.remove(&image_gtk);

    // Generate new image
    let image_gtk: gtk::Image = spiral.generate_to_gtk();

    // Put new image to the layout box
    box_vert.pack_start(&image_gtk, false, false, 20);
    window.show_all();
}));