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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::logical_geometry::WritingMode;
use style::properties::longhands::box_sizing::computed_value::T as BoxSizing;
use style::properties::ComputedValues;
use style::values::computed::{Length, LengthPercentage, Percentage};
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, Serialize)]
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(),
}
}
fn map(&self, f: impl Fn(Length) -> Length) -> Self {
Self {
min_content: f(self.min_content),
max_content: f(self.max_content),
}
}
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, Serialize)]
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,
containing_block_writing_mode: WritingMode,
) -> ContentSizes {
let (mut outer, percentages) =
self.outer_inline_and_percentages(style, containing_block_writing_mode);
outer.adjust_for_pbm_percentages(percentages);
outer
}
pub(crate) fn outer_inline_and_percentages(
&self,
style: &ComputedValues,
containing_block_writing_mode: WritingMode,
) -> (ContentSizes, Percentage) {
let padding = style.padding(containing_block_writing_mode);
let border = style.border_width(containing_block_writing_mode);
let margin = style.margin(containing_block_writing_mode);
let mut pbm_percentages = Percentage::zero();
let mut decompose = |x: &LengthPercentage| {
pbm_percentages += x.to_percentage().unwrap_or_else(Zero::zero);
x.to_length().unwrap_or_else(Zero::zero)
};
let pb_lengths =
border.inline_sum() + decompose(padding.inline_start) + decompose(padding.inline_end);
let mut m_lengths = Length::zero();
if let Some(m) = margin.inline_start.non_auto() {
m_lengths += decompose(m)
}
if let Some(m) = margin.inline_end.non_auto() {
m_lengths += decompose(m)
}
let box_sizing = style.get_position().box_sizing;
let inline_size = style
.box_size(containing_block_writing_mode)
.inline
.non_auto()
// Percentages for 'width' are treated as 'auto'
.and_then(|lp| lp.to_length());
let min_inline_size = style
.min_box_size(containing_block_writing_mode)
.inline
// Percentages for 'min-width' are treated as zero
.percentage_relative_to(Length::zero())
// FIXME: 'auto' is not zero in Flexbox
.auto_is(Length::zero);
let max_inline_size = style
.max_box_size(containing_block_writing_mode)
.inline
// Percentages for 'max-width' are treated as 'none'
.and_then(|lp| lp.to_length());
let clamp = |l: Length| l.clamp_between_extremums(min_inline_size, max_inline_size);
let border_box_sizes = match inline_size {
Some(non_auto) => {
let clamped = clamp(non_auto);
let border_box_size = match box_sizing {
BoxSizing::ContentBox => clamped + pb_lengths,
BoxSizing::BorderBox => clamped,
};
ContentSizes {
min_content: border_box_size,
max_content: border_box_size,
}
},
None => self.expect_inline().map(|content_box_size| {
match box_sizing {
// Clamp to 'min-width' and 'max-width', which are sizing the…
BoxSizing::ContentBox => clamp(content_box_size) + pb_lengths,
BoxSizing::BorderBox => clamp(content_box_size + pb_lengths),
}
}),
};
let outer = border_box_sizes.map(|s| s + m_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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