use crate::*;

pub struct Layered<'a>(Collection<'a>);

impl<'a> Layered<'a> {
    pub fn new () -> Self {
        Self(Collection::new())
    }
}

impl<'a> Render for Layered<'a> {
    fn render (&self, buf: &mut Buffer, area: Rect) -> Usually<Rect> {
        for layer in self.0.0.iter() {
            layer.render(buf, area)?;
        }
        Ok(area)
    }
}

impl<'a> Collect<'a> for Layered<'a> {
    fn add_box (mut self, item: Box<dyn Render + 'a>) -> Self {
        self.0 = self.0.add_box(item);
        self
    }
    fn add_ref (mut self, item: &'a dyn Render) -> Self {
        self.0 = self.0.add_ref(item);
        self
    }
}