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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/. */
//! CSS handling for the computed value of
//! [`position`][position] values.
//!
//! [position]: https://drafts.csswg.org/css-backgrounds-3/#position
use crate::values::computed::{Integer, LengthPercentage, NonNegativeNumber, Percentage};
use crate::values::generics::position::AspectRatio as GenericAspectRatio;
use crate::values::generics::position::Position as GenericPosition;
use crate::values::generics::position::PositionComponent as GenericPositionComponent;
use crate::values::generics::position::PositionOrAuto as GenericPositionOrAuto;
use crate::values::generics::position::ZIndex as GenericZIndex;
pub use crate::values::specified::position::{GridAutoFlow, GridTemplateAreas, MasonryAutoFlow};
use crate::Zero;
use std::fmt::{self, Write};
use style_traits::{CssWriter, ToCss};
/// The computed value of a CSS `<position>`
pub type Position = GenericPosition<HorizontalPosition, VerticalPosition>;
/// The computed value of an `auto | <position>`
pub type PositionOrAuto = GenericPositionOrAuto<Position>;
/// The computed value of a CSS horizontal position.
pub type HorizontalPosition = LengthPercentage;
/// The computed value of a CSS vertical position.
pub type VerticalPosition = LengthPercentage;
impl Position {
/// `50% 50%`
#[inline]
pub fn center() -> Self {
Self::new(
LengthPercentage::new_percent(Percentage(0.5)),
LengthPercentage::new_percent(Percentage(0.5)),
)
}
/// `0% 0%`
#[inline]
pub fn zero() -> Self {
Self::new(LengthPercentage::zero(), LengthPercentage::zero())
}
}
impl ToCss for Position {
fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
where
W: Write,
{
self.horizontal.to_css(dest)?;
dest.write_char(' ')?;
self.vertical.to_css(dest)
}
}
impl GenericPositionComponent for LengthPercentage {
fn is_center(&self) -> bool {
match self.to_percentage() {
Some(Percentage(per)) => per == 0.5,
_ => false,
}
}
}
/// A computed value for the `z-index` property.
pub type ZIndex = GenericZIndex<Integer>;
/// A computed value for the `aspect-ratio` property.
pub type AspectRatio = GenericAspectRatio<NonNegativeNumber>;
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