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7022f451e1
Also, we drop the pref, layout.css.aspect-ratio-number.enabled, becacuse the spec of css-sizing-4 uses Number now. Differential Revision: https://phabricator.services.mozilla.com/D75233
95 lines
3 KiB
Rust
95 lines
3 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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//! CSS handling for the computed value of
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//! [`position`][position] values.
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//!
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//! [position]: https://drafts.csswg.org/css-backgrounds-3/#position
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use crate::values::computed::{Integer, LengthPercentage, NonNegativeNumber, Percentage};
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use crate::values::generics::position::AspectRatio as GenericAspectRatio;
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use crate::values::generics::position::Position as GenericPosition;
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use crate::values::generics::position::PositionComponent as GenericPositionComponent;
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use crate::values::generics::position::PositionOrAuto as GenericPositionOrAuto;
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use crate::values::generics::position::Ratio as GenericRatio;
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use crate::values::generics::position::ZIndex as GenericZIndex;
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pub use crate::values::specified::position::{GridAutoFlow, GridTemplateAreas, MasonryAutoFlow};
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use crate::Zero;
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use std::cmp::{Ordering, PartialOrd};
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use std::fmt::{self, Write};
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use style_traits::{CssWriter, ToCss};
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/// The computed value of a CSS `<position>`
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pub type Position = GenericPosition<HorizontalPosition, VerticalPosition>;
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/// The computed value of an `auto | <position>`
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pub type PositionOrAuto = GenericPositionOrAuto<Position>;
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/// The computed value of a CSS horizontal position.
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pub type HorizontalPosition = LengthPercentage;
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/// The computed value of a CSS vertical position.
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pub type VerticalPosition = LengthPercentage;
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impl Position {
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/// `50% 50%`
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#[inline]
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pub fn center() -> Self {
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Self::new(
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LengthPercentage::new_percent(Percentage(0.5)),
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LengthPercentage::new_percent(Percentage(0.5)),
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)
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}
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/// `0% 0%`
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#[inline]
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pub fn zero() -> Self {
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Self::new(LengthPercentage::zero(), LengthPercentage::zero())
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}
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}
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impl ToCss for Position {
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fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
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where
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W: Write,
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{
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self.horizontal.to_css(dest)?;
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dest.write_str(" ")?;
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self.vertical.to_css(dest)
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}
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}
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impl GenericPositionComponent for LengthPercentage {
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fn is_center(&self) -> bool {
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match self.to_percentage() {
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Some(Percentage(per)) => per == 0.5,
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_ => false,
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}
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}
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}
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/// A computed value for the `z-index` property.
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pub type ZIndex = GenericZIndex<Integer>;
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/// A computed <ratio> value.
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pub type Ratio = GenericRatio<NonNegativeNumber>;
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impl PartialOrd for Ratio {
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fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
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f64::partial_cmp(
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&((self.0).0 as f64 * (other.1).0 as f64),
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&((self.1).0 as f64 * (other.0).0 as f64),
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)
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}
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}
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impl Ratio {
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/// Returns a new Ratio.
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pub fn new(a: f32, b: f32) -> Self {
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GenericRatio(a.into(), b.into())
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}
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}
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/// A computed value for the `aspect-ratio` property.
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pub type AspectRatio = GenericAspectRatio<NonNegativeNumber>;
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