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use super::{Smart, StyleChain};
use crate::geom::{Abs, Axes, Corners, Em, Length, Numeric, Rel, Sides};
use crate::library::text::TextNode;
/// A property that is resolved with other properties from the style chain.
pub trait Resolve {
/// The type of the resolved output.
type Output;
/// Resolve the value using the style chain.
fn resolve(self, styles: StyleChain) -> Self::Output;
}
impl Resolve for Em {
type Output = Abs;
fn resolve(self, styles: StyleChain) -> Self::Output {
if self.is_zero() {
Abs::zero()
} else {
self.at(styles.get(TextNode::SIZE))
}
}
}
impl Resolve for Length {
type Output = Abs;
fn resolve(self, styles: StyleChain) -> Self::Output {
self.abs + self.em.resolve(styles)
}
}
impl<T: Resolve> Resolve for Option<T> {
type Output = Option<T::Output>;
fn resolve(self, styles: StyleChain) -> Self::Output {
self.map(|v| v.resolve(styles))
}
}
impl<T: Resolve> Resolve for Smart<T> {
type Output = Smart<T::Output>;
fn resolve(self, styles: StyleChain) -> Self::Output {
self.map(|v| v.resolve(styles))
}
}
impl<T: Resolve> Resolve for Axes<T> {
type Output = Axes<T::Output>;
fn resolve(self, styles: StyleChain) -> Self::Output {
self.map(|v| v.resolve(styles))
}
}
impl<T: Resolve> Resolve for Sides<T> {
type Output = Sides<T::Output>;
fn resolve(self, styles: StyleChain) -> Self::Output {
self.map(|v| v.resolve(styles))
}
}
impl<T: Resolve> Resolve for Corners<T> {
type Output = Corners<T::Output>;
fn resolve(self, styles: StyleChain) -> Self::Output {
self.map(|v| v.resolve(styles))
}
}
impl<T> Resolve for Rel<T>
where
T: Resolve + Numeric,
<T as Resolve>::Output: Numeric,
{
type Output = Rel<<T as Resolve>::Output>;
fn resolve(self, styles: StyleChain) -> Self::Output {
self.map(|abs| abs.resolve(styles))
}
}
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