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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/. */
//! https://drafts.csswg.org/css-sizing/
use crate::style_ext::ComputedValuesExt;
use style::properties::ComputedValues;
use style::values::computed::{Length, LengthPercentage, Percentage};
use style::values::generics::length::MaxSize;
use style::Zero;
/// Which min/max-content values should be computed during box construction
#[derive(Clone, Copy, Debug)]
pub(crate) enum ContentSizesRequest {
Inline,
None,
}
impl ContentSizesRequest {
pub fn inline_if(condition: bool) -> Self {
if condition {
Self::Inline
} else {
Self::None
}
}
pub fn requests_inline(self) -> bool {
match self {
Self::Inline => true,
Self::None => false,
}
}
pub fn if_requests_inline<T>(self, f: impl FnOnce() -> T) -> Option<T> {
match self {
Self::Inline => Some(f()),
Self::None => None,
}
}
pub fn compute(self, compute_inline: impl FnOnce() -> ContentSizes) -> BoxContentSizes {
match self {
Self::Inline => BoxContentSizes::Inline(compute_inline()),
Self::None => BoxContentSizes::NoneWereRequested,
}
}
}
#[derive(Clone, Debug)]
pub(crate) struct ContentSizes {
pub min_content: Length,
pub max_content: Length,
}
/// https://drafts.csswg.org/css-sizing/#intrinsic-sizes
impl ContentSizes {
pub fn zero() -> Self {
Self {
min_content: Length::zero(),
max_content: Length::zero(),
}
}
pub fn max_assign(&mut self, other: &Self) {
self.min_content.max_assign(other.min_content);
self.max_content.max_assign(other.max_content);
}
/// Relevant to outer intrinsic inline sizes, for percentages from padding and margin.
pub fn adjust_for_pbm_percentages(&mut self, percentages: Percentage) {
// " Note that this may yield an infinite result, but undefined results
// (zero divided by zero) must be treated as zero. "
if self.max_content.px() == 0. {
// Avoid a potential `NaN`.
// Zero is already the result we want regardless of `denominator`.
} else {
let denominator = (1. - percentages.0).max(0.);
self.max_content = Length::new(self.max_content.px() / denominator);
}
}
}
/// Optional min/max-content for storage in the box tree
#[derive(Debug)]
pub(crate) enum BoxContentSizes {
NoneWereRequested, // … during box construction
Inline(ContentSizes),
}
impl BoxContentSizes {
fn expect_inline(&self) -> &ContentSizes {
match self {
Self::NoneWereRequested => panic!("Accessing content size that was not requested"),
Self::Inline(s) => s,
}
}
/// https://dbaron.org/css/intrinsic/#outer-intrinsic
pub fn outer_inline(&self, style: &ComputedValues) -> ContentSizes {
let (mut outer, percentages) = self.outer_inline_and_percentages(style);
outer.adjust_for_pbm_percentages(percentages);
outer
}
pub(crate) fn outer_inline_and_percentages(
&self,
style: &ComputedValues,
) -> (ContentSizes, Percentage) {
// FIXME: account for 'box-sizing'
let inline_size = style.box_size().inline;
let min_inline_size = style
.min_box_size()
.inline
.percentage_relative_to(Length::zero())
.auto_is(Length::zero);
let max_inline_size = match style.max_box_size().inline {
MaxSize::None => None,
MaxSize::LengthPercentage(ref lp) => lp.to_length(),
};
let clamp = |l: Length| l.clamp_between_extremums(min_inline_size, max_inline_size);
// Percentages for 'width' are treated as 'auto'
let inline_size = inline_size.map(|lp| lp.to_length());
// The (inner) min/max-content are only used for 'auto'
let mut outer = match inline_size.non_auto().flatten() {
None => {
let inner = self.expect_inline().clone();
ContentSizes {
min_content: clamp(inner.min_content),
max_content: clamp(inner.max_content),
}
},
Some(length) => {
let length = clamp(length);
ContentSizes {
min_content: length,
max_content: length,
}
},
};
let mut pbm_lengths = Length::zero();
let mut pbm_percentages = Percentage::zero();
let padding = style.padding();
let border = style.border_width();
let margin = style.margin();
pbm_lengths += border.inline_sum();
let mut add = |x: LengthPercentage| {
if let Some(l) = x.to_length() {
pbm_lengths += l;
}
if let Some(p) = x.to_percentage() {
pbm_percentages += p;
}
};
add(padding.inline_start);
add(padding.inline_end);
margin.inline_start.non_auto().map(&mut add);
margin.inline_end.non_auto().map(&mut add);
outer.min_content += pbm_lengths;
outer.max_content += pbm_lengths;
(outer, pbm_percentages)
}
/// https://drafts.csswg.org/css2/visudet.html#shrink-to-fit-float
pub(crate) fn shrink_to_fit(&self, available_size: Length) -> Length {
let inline = self.expect_inline();
available_size
.max(inline.min_content)
.min(inline.max_content)
}
}
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