use crate::*;
use std::ops::Deref;

/// Render target.
pub trait Output: Send + Sync + Sized {
    /// Unit of length
    type Unit: Coordinate;
    /// Rectangle without offset
    type Size: Size<Self::Unit>;
    /// Rectangle with offset
    type Area: Area<Self::Unit>;
    /// Current output area
    fn area (&self) -> Self::Area;
    /// Mutable pointer to area
    fn area_mut (&mut self) -> &mut Self::Area;
    /// Render widget in area
    fn place <'t, T: Render<Self> + ?Sized> (&mut self, area: Self::Area, content: &'t T);
    #[inline] fn x (&self) -> Self::Unit { self.area().x() }
    #[inline] fn y (&self) -> Self::Unit { self.area().y() }
    #[inline] fn w (&self) -> Self::Unit { self.area().w() }
    #[inline] fn h (&self) -> Self::Unit { self.area().h() }
    #[inline] fn wh (&self) -> Self::Size { self.area().wh().into() }
}