gtk_image_abstraction.rs

type ImageRef = Rc<RefCell<Option<gtk::Image>>>;

#[derive(Clone)]
struct ImageWrapper {
    internal_value: ImageRef
}

impl ImageWrapper {
    fn new() -> ImageWrapper {
        ImageWrapper { internal_value: Rc::new(RefCell::new(None)) }
    }

    fn get_image(&self) -> Result<gtk::Image, &str> {
        let image_wrapper = self.internal_value.borrow();
        match image_wrapper.as_ref() {
            Some(image) => Ok(image.clone()),
            None => Err("Expected an image!")
        }
    }

    fn set_image(&self, image_gtk: gtk::Image) {
        let mut image = self.internal_value.borrow_mut();
        *image = Some(image_gtk);
    }
}