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* Use 2024 style edition Signed-off-by: Simon Wülker <simon.wuelker@arcor.de> * Reformat all code Signed-off-by: Simon Wülker <simon.wuelker@arcor.de> --------- Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>
276 lines
10 KiB
Rust
276 lines
10 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 https://mozilla.org/MPL/2.0/. */
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//! <https://drafts.csswg.org/css-sizing/>
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use std::cell::LazyCell;
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use std::ops::{Add, AddAssign};
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use app_units::Au;
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use style::Zero;
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use style::values::computed::LengthPercentage;
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use crate::context::LayoutContext;
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use crate::geom::Size;
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use crate::style_ext::{AspectRatio, Clamp, ComputedValuesExt, ContentBoxSizesAndPBM, LayoutStyle};
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use crate::{ConstraintSpace, IndefiniteContainingBlock, LogicalVec2};
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#[derive(PartialEq)]
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pub(crate) enum IntrinsicSizingMode {
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/// Used to refer to a min-content contribution or max-content contribution.
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/// This is the size that a box contributes to its containing block’s min-content
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/// or max-content size. Note this is based on the outer size of the box,
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/// and takes into account the relevant sizing properties of the element.
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/// <https://drafts.csswg.org/css-sizing-3/#contributions>
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Contribution,
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/// Used to refer to a min-content size or max-content size.
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/// This is the size based on the contents of an element, without regard for its context.
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/// Note this is usually based on the inner (content-box) size of the box,
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/// and ignores the relevant sizing properties of the element.
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/// <https://drafts.csswg.org/css-sizing-3/#intrinsic>
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Size,
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}
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#[derive(Clone, Copy, Debug, Default)]
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pub(crate) struct ContentSizes {
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pub min_content: Au,
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pub max_content: Au,
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}
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/// <https://drafts.csswg.org/css-sizing/#intrinsic-sizes>
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impl ContentSizes {
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pub fn max(&self, other: Self) -> Self {
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Self {
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min_content: self.min_content.max(other.min_content),
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max_content: self.max_content.max(other.max_content),
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}
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}
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pub fn max_assign(&mut self, other: Self) {
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*self = self.max(other);
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}
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pub fn union(&self, other: &Self) -> Self {
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Self {
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min_content: self.min_content.max(other.min_content),
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max_content: self.max_content + other.max_content,
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}
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}
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pub fn map(&self, f: impl Fn(Au) -> Au) -> Self {
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Self {
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min_content: f(self.min_content),
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max_content: f(self.max_content),
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}
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}
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}
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impl Zero for ContentSizes {
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fn zero() -> Self {
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Au::zero().into()
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}
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fn is_zero(&self) -> bool {
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self.min_content.is_zero() && self.max_content.is_zero()
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}
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}
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impl Add for ContentSizes {
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type Output = Self;
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fn add(self, rhs: Self) -> Self {
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Self {
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min_content: self.min_content + rhs.min_content,
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max_content: self.max_content + rhs.max_content,
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}
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}
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}
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impl AddAssign for ContentSizes {
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fn add_assign(&mut self, rhs: Self) {
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*self = self.add(rhs)
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}
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}
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impl ContentSizes {
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/// Clamps the provided amount to be between the min-content and the max-content.
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/// This is called "shrink-to-fit" in CSS2, and "fit-content" in CSS Sizing.
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/// <https://drafts.csswg.org/css2/visudet.html#shrink-to-fit-float>
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/// <https://drafts.csswg.org/css-sizing/#funcdef-width-fit-content>
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pub fn shrink_to_fit(&self, available_size: Au) -> Au {
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// This formula is slightly different than what the spec says,
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// to ensure that the minimum wins for a malformed ContentSize
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// whose min_content is larger than its max_content.
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available_size.min(self.max_content).max(self.min_content)
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}
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}
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impl From<Au> for ContentSizes {
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fn from(size: Au) -> Self {
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Self {
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min_content: size,
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max_content: size,
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}
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}
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}
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#[allow(clippy::too_many_arguments)]
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pub(crate) fn outer_inline(
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layout_style: &LayoutStyle,
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containing_block: &IndefiniteContainingBlock,
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auto_minimum: &LogicalVec2<Au>,
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auto_block_size_stretches_to_containing_block: bool,
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is_replaced: bool,
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establishes_containing_block: bool,
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get_preferred_aspect_ratio: impl FnOnce(&LogicalVec2<Au>) -> Option<AspectRatio>,
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get_content_size: impl FnOnce(&ConstraintSpace) -> InlineContentSizesResult,
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) -> InlineContentSizesResult {
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let ContentBoxSizesAndPBM {
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content_box_sizes,
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pbm,
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mut depends_on_block_constraints,
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} = layout_style.content_box_sizes_and_padding_border_margin(containing_block);
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let margin = pbm.margin.map(|v| v.auto_is(Au::zero));
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let pbm_sums = LogicalVec2 {
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block: pbm.padding_border_sums.block + margin.block_sum(),
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inline: pbm.padding_border_sums.inline + margin.inline_sum(),
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};
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let style = layout_style.style();
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let content_size = LazyCell::new(|| {
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let constraint_space = if establishes_containing_block {
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let available_block_size = containing_block
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.size
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.block
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.map(|v| Au::zero().max(v - pbm_sums.block));
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let automatic_size = if content_box_sizes.block.preferred.is_initial() &&
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auto_block_size_stretches_to_containing_block
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{
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depends_on_block_constraints = true;
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Size::Stretch
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} else {
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Size::FitContent
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};
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ConstraintSpace::new(
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content_box_sizes.block.resolve_extrinsic(
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automatic_size,
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auto_minimum.block,
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available_block_size,
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),
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style.writing_mode,
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get_preferred_aspect_ratio(&pbm.padding_border_sums),
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)
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} else {
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// This assumes that there is no preferred aspect ratio, or that there is no
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// block size constraint to be transferred so the ratio is irrelevant.
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// We only get into here for anonymous blocks, for which the assumption holds.
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ConstraintSpace::new(
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containing_block.size.block.into(),
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containing_block.writing_mode,
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None,
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)
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};
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get_content_size(&constraint_space)
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});
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let resolve_non_initial = |inline_size| {
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Some(match inline_size {
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Size::Initial => return None,
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Size::Numeric(numeric) => (numeric, numeric, false),
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Size::MinContent => (
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content_size.sizes.min_content,
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content_size.sizes.min_content,
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content_size.depends_on_block_constraints,
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),
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Size::MaxContent => (
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content_size.sizes.max_content,
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content_size.sizes.max_content,
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content_size.depends_on_block_constraints,
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),
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Size::Stretch | Size::FitContent => (
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content_size.sizes.min_content,
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content_size.sizes.max_content,
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content_size.depends_on_block_constraints,
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),
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})
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};
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let (mut preferred_min_content, preferred_max_content, preferred_depends_on_block_constraints) =
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resolve_non_initial(content_box_sizes.inline.preferred)
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.unwrap_or_else(|| resolve_non_initial(Size::FitContent).unwrap());
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let (mut min_min_content, mut min_max_content, mut min_depends_on_block_constraints) =
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resolve_non_initial(content_box_sizes.inline.min).unwrap_or((
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auto_minimum.inline,
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auto_minimum.inline,
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false,
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));
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let (mut max_min_content, max_max_content, max_depends_on_block_constraints) =
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resolve_non_initial(content_box_sizes.inline.max)
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.map(|(min_content, max_content, depends_on_block_constraints)| {
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(
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Some(min_content),
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Some(max_content),
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depends_on_block_constraints,
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)
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})
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.unwrap_or_default();
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// https://drafts.csswg.org/css-sizing-3/#replaced-percentage-min-contribution
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// > If the box is replaced, a cyclic percentage in the value of any max size property
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// > or preferred size property (width/max-width/height/max-height), is resolved against
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// > zero when calculating the min-content contribution in the corresponding axis.
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//
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// This means that e.g. the min-content contribution of `width: calc(100% + 100px)`
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// should be 100px, but it's just zero on other browsers, so we do the same.
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if is_replaced {
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let has_percentage = |size: Size<LengthPercentage>| {
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// We need a comment here to avoid breaking `./mach test-tidy`.
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matches!(size, Size::Numeric(numeric) if numeric.has_percentage())
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};
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if content_box_sizes.inline.preferred.is_initial() &&
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has_percentage(style.box_size(containing_block.writing_mode).inline)
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{
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preferred_min_content = Au::zero();
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}
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if content_box_sizes.inline.max.is_initial() &&
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has_percentage(style.max_box_size(containing_block.writing_mode).inline)
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{
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max_min_content = Some(Au::zero());
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}
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}
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// Regardless of their sizing properties, tables are always forced to be at least
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// as big as their min-content size, so floor the minimums.
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if layout_style.is_table() {
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min_min_content.max_assign(content_size.sizes.min_content);
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min_max_content.max_assign(content_size.sizes.min_content);
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min_depends_on_block_constraints |= content_size.depends_on_block_constraints;
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}
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InlineContentSizesResult {
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sizes: ContentSizes {
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min_content: preferred_min_content
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.clamp_between_extremums(min_min_content, max_min_content) +
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pbm_sums.inline,
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max_content: preferred_max_content
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.clamp_between_extremums(min_max_content, max_max_content) +
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pbm_sums.inline,
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},
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depends_on_block_constraints: depends_on_block_constraints &&
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(preferred_depends_on_block_constraints ||
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min_depends_on_block_constraints ||
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max_depends_on_block_constraints),
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}
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}
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#[derive(Clone, Copy, Debug)]
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pub(crate) struct InlineContentSizesResult {
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pub sizes: ContentSizes,
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pub depends_on_block_constraints: bool,
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}
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pub(crate) trait ComputeInlineContentSizes {
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fn compute_inline_content_sizes(
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&self,
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layout_context: &LayoutContext,
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constraint_space: &ConstraintSpace,
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) -> InlineContentSizesResult;
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}
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