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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
//! Generic types for CSS handling of specified and computed values of
use crate::values::animated::ToAnimatedZero;
use crate::values::generics::ratio::Ratio;
/// A generic type for representing a CSS [position](https://drafts.csswg.org/css-values/#position).
#[derive(
Animate,
Clone,
ComputeSquaredDistance,
Copy,
Debug,
Deserialize,
MallocSizeOf,
PartialEq,
Serialize,
SpecifiedValueInfo,
ToAnimatedValue,
ToAnimatedZero,
ToComputedValue,
ToResolvedValue,
ToShmem,
)]
#[repr(C)]
pub struct GenericPosition<H, V> {
/// The horizontal component of position.
pub horizontal: H,
/// The vertical component of position.
pub vertical: V,
}
impl<H, V> PositionComponent for Position<H, V>
where
H: PositionComponent,
V: PositionComponent,
{
#[inline]
fn is_center(&self) -> bool {
self.horizontal.is_center() && self.vertical.is_center()
}
}
pub use self::GenericPosition as Position;
impl<H, V> Position<H, V> {
/// Returns a new position.
pub fn new(horizontal: H, vertical: V) -> Self {
Self {
horizontal,
vertical,
}
}
}
/// Implements a method that checks if the position is centered.
pub trait PositionComponent {
/// Returns if the position component is 50% or center.
/// For pixel lengths, it always returns false.
fn is_center(&self) -> bool;
}
/// A generic type for representing an `Auto | <position>`.
/// This is used by <offset-anchor> for now.
#[derive(
Animate,
Clone,
ComputeSquaredDistance,
Copy,
Debug,
Deserialize,
MallocSizeOf,
Parse,
PartialEq,
Serialize,
SpecifiedValueInfo,
ToAnimatedZero,
ToAnimatedValue,
ToComputedValue,
ToCss,
ToResolvedValue,
ToShmem,
)]
#[repr(C, u8)]
pub enum GenericPositionOrAuto<Pos> {
/// The <position> value.
Position(Pos),
/// The keyword `auto`.
Auto,
}
pub use self::GenericPositionOrAuto as PositionOrAuto;
impl<Pos> PositionOrAuto<Pos> {
/// Return `auto`.
#[inline]
pub fn auto() -> Self {
PositionOrAuto::Auto
}
/// Return true if it is 'auto'.
#[inline]
pub fn is_auto(&self) -> bool {
matches!(self, PositionOrAuto::Auto)
}
}
/// A generic value for the `z-index` property.
#[derive(
Animate,
Clone,
ComputeSquaredDistance,
Copy,
Debug,
MallocSizeOf,
PartialEq,
Parse,
SpecifiedValueInfo,
ToAnimatedZero,
ToComputedValue,
ToCss,
ToResolvedValue,
ToShmem,
)]
#[repr(C, u8)]
pub enum GenericZIndex<I> {
/// An integer value.
Integer(I),
/// The keyword `auto`.
Auto,
}
pub use self::GenericZIndex as ZIndex;
impl<Integer> ZIndex<Integer> {
/// Returns `auto`
#[inline]
pub fn auto() -> Self {
ZIndex::Auto
}
/// Returns whether `self` is `auto`.
#[inline]
pub fn is_auto(self) -> bool {
matches!(self, ZIndex::Auto)
}
/// Returns the integer value if it is an integer, or `auto`.
#[inline]
pub fn integer_or(self, auto: Integer) -> Integer {
match self {
ZIndex::Integer(n) => n,
ZIndex::Auto => auto,
}
}
}
/// Ratio or None.
#[derive(
Animate,
Clone,
ComputeSquaredDistance,
Copy,
Debug,
MallocSizeOf,
PartialEq,
SpecifiedValueInfo,
ToComputedValue,
ToCss,
ToResolvedValue,
ToShmem,
)]
#[repr(C, u8)]
pub enum PreferredRatio<N> {
/// Without specified ratio
#[css(skip)]
None,
/// With specified ratio
Ratio(
#[animation(field_bound)]
#[css(field_bound)]
#[distance(field_bound)]
Ratio<N>,
),
}
/// A generic value for the `aspect-ratio` property, the value is `auto || <ratio>`.
#[derive(
Animate,
Clone,
ComputeSquaredDistance,
Copy,
Debug,
MallocSizeOf,
PartialEq,
SpecifiedValueInfo,
ToComputedValue,
ToCss,
ToResolvedValue,
ToShmem,
)]
#[repr(C)]
pub struct GenericAspectRatio<N> {
/// Specifiy auto or not.
#[animation(constant)]
#[css(represents_keyword)]
pub auto: bool,
/// The preferred aspect-ratio value.
#[animation(field_bound)]
#[css(field_bound)]
#[distance(field_bound)]
pub ratio: PreferredRatio<N>,
}
pub use self::GenericAspectRatio as AspectRatio;
impl<N> AspectRatio<N> {
/// Returns `auto`
#[inline]
pub fn auto() -> Self {
AspectRatio {
auto: true,
ratio: PreferredRatio::None,
}
}
}
impl<N> ToAnimatedZero for AspectRatio<N> {
#[inline]
fn to_animated_zero(&self) -> Result<Self, ()> {
Err(())
}
}