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65 lines
1.8 KiB
Rust
65 lines
1.8 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 http://mozilla.org/MPL/2.0/. */
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//! Generic types for CSS values related to backgrounds.
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use crate::values::IsAuto;
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use std::fmt::{self, Write};
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use style_traits::{CssWriter, ToCss};
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/// A generic value for the `background-size` property.
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#[derive(
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Animate,
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Clone,
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ComputeSquaredDistance,
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Copy,
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Debug,
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MallocSizeOf,
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PartialEq,
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SpecifiedValueInfo,
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ToAnimatedValue,
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ToAnimatedZero,
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ToComputedValue,
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)]
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pub enum BackgroundSize<LengthOrPercentageOrAuto> {
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/// `<width> <height>`
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Explicit {
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/// Explicit width.
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width: LengthOrPercentageOrAuto,
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/// Explicit height.
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height: LengthOrPercentageOrAuto,
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},
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/// `cover`
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#[animation(error)]
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Cover,
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/// `contain`
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#[animation(error)]
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Contain,
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}
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impl<LengthOrPercentageOrAuto> ToCss for BackgroundSize<LengthOrPercentageOrAuto>
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where
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LengthOrPercentageOrAuto: ToCss + IsAuto,
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{
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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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match self {
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BackgroundSize::Explicit { width, height } => {
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width.to_css(dest)?;
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// NOTE(emilio): We should probably simplify all these in case
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// `width == `height`, but all other browsers agree on only
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// special-casing `auto`.
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if !width.is_auto() || !height.is_auto() {
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dest.write_str(" ")?;
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height.to_css(dest)?;
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}
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Ok(())
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},
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BackgroundSize::Cover => dest.write_str("cover"),
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BackgroundSize::Contain => dest.write_str("contain"),
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}
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}
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}
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