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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
//! Lists have various ways of being animated, this module implements them.
//!
//! See https://drafts.csswg.org/web-animations-1/#animating-properties
/// https://drafts.csswg.org/web-animations-1/#by-computed-value
pub mod by_computed_value {
use crate::values::{
animated::{Animate, Procedure},
distance::{ComputeSquaredDistance, SquaredDistance},
};
use std::iter::FromIterator;
#[allow(missing_docs)]
pub fn animate<T, C>(left: &[T], right: &[T], procedure: Procedure) -> Result<C, ()>
where
T: Animate,
C: FromIterator<T>,
{
if left.len() != right.len() {
return Err(());
}
left.iter()
.zip(right.iter())
.map(|(left, right)| left.animate(right, procedure))
.collect()
}
#[allow(missing_docs)]
pub fn squared_distance<T>(left: &[T], right: &[T]) -> Result<SquaredDistance, ()>
where
T: ComputeSquaredDistance,
{
if left.len() != right.len() {
return Err(());
}
left.iter()
.zip(right.iter())
.map(|(left, right)| left.compute_squared_distance(right))
.sum()
}
}
/// This is the animation used for some of the types like shadows and filters, where the
/// interpolation happens with the zero value if one of the sides is not present.
///
/// https://drafts.csswg.org/web-animations-1/#animating-shadow-lists
pub mod with_zero {
use crate::values::animated::ToAnimatedZero;
use crate::values::{
animated::{Animate, Procedure},
distance::{ComputeSquaredDistance, SquaredDistance},
};
use itertools::{EitherOrBoth, Itertools};
use std::iter::FromIterator;
#[allow(missing_docs)]
pub fn animate<T, C>(left: &[T], right: &[T], procedure: Procedure) -> Result<C, ()>
where
T: Animate + Clone + ToAnimatedZero,
C: FromIterator<T>,
{
if procedure == Procedure::Add {
return Ok(left.iter().chain(right.iter()).cloned().collect());
}
left.iter()
.zip_longest(right.iter())
.map(|it| match it {
EitherOrBoth::Both(left, right) => left.animate(right, procedure),
EitherOrBoth::Left(left) => left.animate(&left.to_animated_zero()?, procedure),
EitherOrBoth::Right(right) => right.to_animated_zero()?.animate(right, procedure),
})
.collect()
}
#[allow(missing_docs)]
pub fn squared_distance<T>(left: &[T], right: &[T]) -> Result<SquaredDistance, ()>
where
T: ToAnimatedZero + ComputeSquaredDistance,
{
left.iter()
.zip_longest(right.iter())
.map(|it| match it {
EitherOrBoth::Both(left, right) => left.compute_squared_distance(right),
EitherOrBoth::Left(item) | EitherOrBoth::Right(item) => {
item.to_animated_zero()?.compute_squared_distance(item)
},
})
.sum()
}
}
/// https://drafts.csswg.org/web-animations-1/#repeatable-list
pub mod repeatable_list {
use crate::values::{
animated::{Animate, Procedure},
distance::{ComputeSquaredDistance, SquaredDistance},
};
use std::iter::FromIterator;
#[allow(missing_docs)]
pub fn animate<T, C>(left: &[T], right: &[T], procedure: Procedure) -> Result<C, ()>
where
T: Animate,
C: FromIterator<T>,
{
use num_integer::lcm;
// If the length of either list is zero, the least common multiple is undefined.
if left.is_empty() || right.is_empty() {
return Err(());
}
let len = lcm(left.len(), right.len());
left.iter()
.cycle()
.zip(right.iter().cycle())
.take(len)
.map(|(left, right)| left.animate(right, procedure))
.collect()
}
#[allow(missing_docs)]
pub fn squared_distance<T>(left: &[T], right: &[T]) -> Result<SquaredDistance, ()>
where
T: ComputeSquaredDistance,
{
use num_integer::lcm;
if left.is_empty() || right.is_empty() {
return Err(());
}
let len = lcm(left.len(), right.len());
left.iter()
.cycle()
.zip(right.iter().cycle())
.take(len)
.map(|(left, right)| left.compute_squared_distance(right))
.sum()
}
}
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