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use super::*;
/// A value that is composed of a relative and an absolute part.
#[derive(Default, Copy, Clone, Eq, PartialEq, Hash)]
pub struct Rel<T: Numeric> {
/// The relative part.
pub rel: Ratio,
/// The absolute part.
pub abs: T,
}
impl<T: Numeric> Rel<T> {
/// The zero relative.
pub fn zero() -> Self {
Self { rel: Ratio::zero(), abs: T::zero() }
}
/// A relative with a ratio of `100%` and no absolute part.
pub fn one() -> Self {
Self { rel: Ratio::one(), abs: T::zero() }
}
/// Create a new relative from its parts.
pub fn new(rel: Ratio, abs: T) -> Self {
Self { rel, abs }
}
/// Whether both parts are zero.
pub fn is_zero(self) -> bool {
self.rel.is_zero() && self.abs == T::zero()
}
/// Whether the relative part is one and the absolute part is zero.
pub fn is_one(self) -> bool {
self.rel.is_one() && self.abs == T::zero()
}
/// Evaluate this relative to the given `whole`.
pub fn relative_to(self, whole: T) -> T {
self.rel.of(whole) + self.abs
}
/// Map the absolute part with `f`.
pub fn map<F, U>(self, f: F) -> Rel<U>
where
F: FnOnce(T) -> U,
U: Numeric,
{
Rel { rel: self.rel, abs: f(self.abs) }
}
}
impl Rel<Length> {
/// Try to divide two relative lengths.
pub fn try_div(self, other: Self) -> Option<f64> {
if self.rel.is_zero() && other.rel.is_zero() {
self.abs.try_div(other.abs)
} else if self.abs.is_zero() && other.abs.is_zero() {
Some(self.rel / other.rel)
} else {
None
}
}
}
impl<T: Numeric> Debug for Rel<T> {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
match (self.rel.is_zero(), self.abs.is_zero()) {
(false, false) => write!(f, "{:?} + {:?}", self.rel, self.abs),
(false, true) => self.rel.fmt(f),
(true, _) => self.abs.fmt(f),
}
}
}
impl From<Abs> for Rel<Length> {
fn from(abs: Abs) -> Self {
Rel::from(Length::from(abs))
}
}
impl From<Em> for Rel<Length> {
fn from(em: Em) -> Self {
Rel::from(Length::from(em))
}
}
impl<T: Numeric> From<T> for Rel<T> {
fn from(abs: T) -> Self {
Self { rel: Ratio::zero(), abs }
}
}
impl<T: Numeric> From<Ratio> for Rel<T> {
fn from(rel: Ratio) -> Self {
Self { rel, abs: T::zero() }
}
}
impl<T: Numeric + PartialOrd> PartialOrd for Rel<T> {
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
if self.rel.is_zero() && other.rel.is_zero() {
self.abs.partial_cmp(&other.abs)
} else if self.abs.is_zero() && other.abs.is_zero() {
self.rel.partial_cmp(&other.rel)
} else {
None
}
}
}
impl<T: Numeric> Neg for Rel<T> {
type Output = Self;
fn neg(self) -> Self {
Self { rel: -self.rel, abs: -self.abs }
}
}
impl<T: Numeric> Add for Rel<T> {
type Output = Self;
fn add(self, other: Self) -> Self::Output {
Self {
rel: self.rel + other.rel,
abs: self.abs + other.abs,
}
}
}
impl<T: Numeric> Sub for Rel<T> {
type Output = Self;
fn sub(self, other: Self) -> Self::Output {
self + -other
}
}
impl<T: Numeric> Mul<f64> for Rel<T> {
type Output = Self;
fn mul(self, other: f64) -> Self::Output {
Self { rel: self.rel * other, abs: self.abs * other }
}
}
impl<T: Numeric> Mul<Rel<T>> for f64 {
type Output = Rel<T>;
fn mul(self, other: Rel<T>) -> Self::Output {
other * self
}
}
impl<T: Numeric> Div<f64> for Rel<T> {
type Output = Self;
fn div(self, other: f64) -> Self::Output {
Self { rel: self.rel / other, abs: self.abs / other }
}
}
impl<T: Numeric + AddAssign> AddAssign for Rel<T> {
fn add_assign(&mut self, other: Self) {
self.rel += other.rel;
self.abs += other.abs;
}
}
impl<T: Numeric + SubAssign> SubAssign for Rel<T> {
fn sub_assign(&mut self, other: Self) {
self.rel -= other.rel;
self.abs -= other.abs;
}
}
impl<T: Numeric + MulAssign<f64>> MulAssign<f64> for Rel<T> {
fn mul_assign(&mut self, other: f64) {
self.rel *= other;
self.abs *= other;
}
}
impl<T: Numeric + DivAssign<f64>> DivAssign<f64> for Rel<T> {
fn div_assign(&mut self, other: f64) {
self.rel /= other;
self.abs /= other;
}
}
impl<T: Numeric> Add<T> for Ratio {
type Output = Rel<T>;
fn add(self, other: T) -> Self::Output {
Rel::from(self) + Rel::from(other)
}
}
impl<T: Numeric> Add<T> for Rel<T> {
type Output = Self;
fn add(self, other: T) -> Self::Output {
self + Rel::from(other)
}
}
impl<T: Numeric> Add<Ratio> for Rel<T> {
type Output = Self;
fn add(self, other: Ratio) -> Self::Output {
self + Rel::from(other)
}
}
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))
}
}
impl Fold for Rel<Abs> {
type Output = Self;
fn fold(self, _: Self::Output) -> Self::Output {
self
}
}
impl Fold for Rel<Length> {
type Output = Self;
fn fold(self, _: Self::Output) -> Self::Output {
self
}
}
cast_to_value! {
v: Rel<Abs> => v.map(Length::from).into()
}
|
