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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 std::ops::{Add, AddAssign};
use app_units::Au;
use serde::Serialize;
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;
use style::Zero;
use crate::style_ext::{Clamp, ComputedValuesExt};
#[derive(Clone, Copy, Debug, Serialize)]
pub(crate) struct ContentSizes {
pub min_content: Au,
pub max_content: Au,
}
/// <https://drafts.csswg.org/css-sizing/#intrinsic-sizes>
impl ContentSizes {
pub fn map(&self, f: impl Fn(Au) -> Au) -> Self {
Self {
min_content: f(self.min_content),
max_content: f(self.max_content),
}
}
pub fn max(&self, other: Self) -> Self {
Self {
min_content: self.min_content.max(other.min_content),
max_content: self.max_content.max(other.max_content),
}
}
pub fn max_assign(&mut self, other: Self) {
*self = self.max(other);
}
pub fn union(&self, other: &Self) -> Self {
Self {
min_content: self.min_content.max(other.min_content),
max_content: self.max_content + other.max_content,
}
}
}
impl Zero for ContentSizes {
fn zero() -> Self {
Self {
min_content: Au::zero(),
max_content: Au::zero(),
}
}
fn is_zero(&self) -> bool {
self.min_content.is_zero() && self.max_content.is_zero()
}
}
impl Add for ContentSizes {
type Output = Self;
fn add(self, rhs: Self) -> Self {
Self {
min_content: self.min_content + rhs.min_content,
max_content: self.max_content + rhs.max_content,
}
}
}
impl AddAssign for ContentSizes {
fn add_assign(&mut self, rhs: Self) {
*self = self.add(rhs)
}
}
impl ContentSizes {
/// <https://drafts.csswg.org/css2/visudet.html#shrink-to-fit-float>
pub fn shrink_to_fit(&self, available_size: Au) -> Au {
available_size.max(self.min_content).min(self.max_content)
}
}
pub(crate) fn outer_inline(
style: &ComputedValues,
containing_block_writing_mode: WritingMode,
get_content_size: impl FnOnce() -> ContentSizes,
) -> ContentSizes {
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);
// For margins and paddings, a cyclic percentage is resolved against zero
// for determining intrinsic size contributions.
// https://drafts.csswg.org/css-sizing-3/#min-percentage-contribution
let zero = Length::zero();
let pb_lengths = border.inline_sum() +
padding.inline_start.percentage_relative_to(zero) +
padding.inline_end.percentage_relative_to(zero);
let mut m_lengths = zero;
if let Some(m) = margin.inline_start.non_auto() {
m_lengths += m.percentage_relative_to(zero)
}
if let Some(m) = margin.inline_end.non_auto() {
m_lengths += m.percentage_relative_to(zero)
}
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(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: Au| {
l.clamp_between_extremums(min_inline_size.into(), max_inline_size.map(|t| t.into()))
};
let border_box_sizes = match inline_size {
Some(non_auto) => {
let clamped = clamp(non_auto.into());
let border_box_size = match box_sizing {
BoxSizing::ContentBox => clamped + pb_lengths.into(),
BoxSizing::BorderBox => clamped,
};
ContentSizes {
min_content: border_box_size,
max_content: border_box_size,
}
},
None => get_content_size().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.into(),
BoxSizing::BorderBox => clamp(content_box_size + pb_lengths.into()),
}
}),
};
border_box_sizes.map(|s| s + m_lengths.into())
}
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