use crate::*;

/// Drawing target.
pub trait Out: 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>;

    /// Render drawable in area specified by `T::layout(self.area())`
    #[inline] fn place <'t, T: Content<Self> + ?Sized> (
        &mut self, content: &'t T
    ) {
        self.place_at(content.layout(self.area()), content)
    }

    /// Render drawable in area specified by `area`
    fn place_at <'t, T: Draw<Self> + ?Sized> (&mut self, area: Self::Area, content: &'t T);

    /// Current output area
    fn area (&self) -> Self::Area;
    #[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() }

    /// Mutable pointer to area.
    fn area_mut (&mut self) -> &mut Self::Area;
}