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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/. */
+
+//! Generic types for CSS handling of specified and computed values of
+//! [`position`](https://drafts.csswg.org/css-backgrounds-3/#position)
+
+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.
+/// https://drafts.fxtf.org/motion-1/#offset-anchor-property
+#[derive(
+ Animate,
+ Clone,
+ ComputeSquaredDistance,
+ Copy,
+ Debug,
+ Deserialize,
+ MallocSizeOf,
+ Parse,
+ PartialEq,
+ Serialize,
+ SpecifiedValueInfo,
+ ToAnimatedZero,
+ 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
+ }
+}
+
+/// 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(())
+ }
+}