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Layout: Implement CSS Grid using taffy (#32619)
* Add layout.grid.enabled pref Signed-off-by: Nico Burns <nico@nicoburns.com> * Add taffy dependency Signed-off-by: Nico Burns <nico@nicoburns.com> * Import taffy <-> stylo conversion code from taffy_stylo crate Signed-off-by: Nico Burns <nico@nicoburns.com> * Add `Grid` variant to DisplayInside Signed-off-by: Nico Burns <nico@nicoburns.com> * Implement CSS Grid using Taffy Signed-off-by: Nico Burns <nico@nicoburns.com> Import full stylo_taffy crate Signed-off-by: Nico Burns <nico@nicoburns.com> Squashed PR feedback changes Deduplicate is_document_only_whitespace Signed-off-by: Nico Burns <nico@nicoburns.com> Import taffy::AvailableSpace Signed-off-by: Nico Burns <nico@nicoburns.com> Rename FlexContext to TaffyContainerContext Signed-off-by: Nico Burns <nico@nicoburns.com> Eliminate references to flexbox in taffy/layout module Signed-off-by: Nico Burns <nico@nicoburns.com> Use constructors for geom types Signed-off-by: Nico Burns <nico@nicoburns.com> Remove comment about abspos elements splitting contiguous text runs Signed-off-by: Nico Burns <nico@nicoburns.com> Remove reference to flexbox in taffy/construct Signed-off-by: Nico Burns <nico@nicoburns.com> Deduplicate construction of flexbox/grid containers Signed-off-by: Nico Burns <nico@nicoburns.com> Make anonymous text runs InFlow Signed-off-by: Nico Burns <nico@nicoburns.com> Remove commented code Signed-off-by: Nico Burns <nico@nicoburns.com> Update comments Signed-off-by: Nico Burns <nico@nicoburns.com> Inline/vendor the stylo/taffy interop code Signed-off-by: Nico Burns <nico@nicoburns.com> * Update test expectations Signed-off-by: Nico Burns <nico@nicoburns.com> * Fix nits from PR review Signed-off-by: Nico Burns <nico@nicoburns.com> --------- Signed-off-by: Nico Burns <nico@nicoburns.com>
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508 changed files with 2057 additions and 10408 deletions
238
components/layout_2020/construct_modern.rs
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238
components/layout_2020/construct_modern.rs
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/* 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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//! Layout construction code that is shared between modern layout modes (Flexbox and CSS Grid)
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use std::borrow::Cow;
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use rayon::iter::{IntoParallelIterator, ParallelIterator};
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use style::values::computed::TextDecorationLine;
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use crate::context::LayoutContext;
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use crate::dom::{BoxSlot, NodeExt};
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use crate::dom_traversal::{Contents, NodeAndStyleInfo, TraversalHandler};
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use crate::flow::inline::construct::InlineFormattingContextBuilder;
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use crate::flow::{BlockContainer, BlockFormattingContext};
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use crate::formatting_contexts::{
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IndependentFormattingContext, NonReplacedFormattingContext,
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NonReplacedFormattingContextContents,
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};
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use crate::style_ext::DisplayGeneratingBox;
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/// <https://drafts.csswg.org/css-flexbox/#flex-items>
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pub(crate) struct ModernContainerBuilder<'a, 'dom, Node> {
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context: &'a LayoutContext<'a>,
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info: &'a NodeAndStyleInfo<Node>,
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text_decoration_line: TextDecorationLine,
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contiguous_text_runs: Vec<ModernContainerTextRun<'dom, Node>>,
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/// To be run in parallel with rayon in `finish`
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jobs: Vec<ModernContainerJob<'dom, Node>>,
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has_text_runs: bool,
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}
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enum ModernContainerJob<'dom, Node> {
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ElementOrPseudoElement {
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info: NodeAndStyleInfo<Node>,
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display: DisplayGeneratingBox,
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contents: Contents,
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box_slot: BoxSlot<'dom>,
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},
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TextRuns(Vec<ModernContainerTextRun<'dom, Node>>),
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}
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struct ModernContainerTextRun<'dom, Node> {
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info: NodeAndStyleInfo<Node>,
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text: Cow<'dom, str>,
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}
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impl<Node> ModernContainerTextRun<'_, Node> {
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/// <https://drafts.csswg.org/css-text/#white-space>
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fn is_only_document_white_space(&self) -> bool {
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// FIXME: is this the right definition? See
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// https://github.com/w3c/csswg-drafts/issues/5146
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// https://github.com/w3c/csswg-drafts/issues/5147
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self.text
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.bytes()
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.all(|byte| matches!(byte, b' ' | b'\n' | b'\t'))
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}
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}
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pub(crate) enum ModernItemKind {
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InFlow,
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OutOfFlow,
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}
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pub(crate) struct ModernItem<'dom> {
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pub kind: ModernItemKind,
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pub order: i32,
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pub box_slot: Option<BoxSlot<'dom>>,
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pub formatting_context: IndependentFormattingContext,
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}
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impl<'a, 'dom, Node: 'dom> TraversalHandler<'dom, Node> for ModernContainerBuilder<'a, 'dom, Node>
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where
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Node: NodeExt<'dom>,
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{
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fn handle_text(&mut self, info: &NodeAndStyleInfo<Node>, text: Cow<'dom, str>) {
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self.contiguous_text_runs.push(ModernContainerTextRun {
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info: info.clone(),
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text,
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})
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}
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/// Or pseudo-element
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fn handle_element(
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&mut self,
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info: &NodeAndStyleInfo<Node>,
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display: DisplayGeneratingBox,
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contents: Contents,
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box_slot: BoxSlot<'dom>,
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) {
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self.wrap_any_text_in_anonymous_block_container();
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self.jobs.push(ModernContainerJob::ElementOrPseudoElement {
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info: info.clone(),
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display,
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contents,
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box_slot,
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})
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}
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}
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impl<'a, 'dom, Node: 'dom> ModernContainerBuilder<'a, 'dom, Node>
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where
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Node: NodeExt<'dom>,
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{
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pub fn new(
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context: &'a LayoutContext<'a>,
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info: &'a NodeAndStyleInfo<Node>,
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text_decoration_line: TextDecorationLine,
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) -> Self {
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ModernContainerBuilder {
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context,
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info,
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text_decoration_line,
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contiguous_text_runs: Vec::new(),
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jobs: Vec::new(),
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has_text_runs: false,
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}
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}
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fn wrap_any_text_in_anonymous_block_container(&mut self) {
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let runs = std::mem::take(&mut self.contiguous_text_runs);
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if runs
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.iter()
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.all(ModernContainerTextRun::is_only_document_white_space)
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{
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// There is no text run, or they all only contain document white space characters
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} else {
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self.jobs.push(ModernContainerJob::TextRuns(runs));
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self.has_text_runs = true;
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}
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}
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pub(crate) fn finish(mut self) -> Vec<ModernItem<'dom>> {
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self.wrap_any_text_in_anonymous_block_container();
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let anonymous_style = if self.has_text_runs {
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Some(
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self.context
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.shared_context()
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.stylist
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.style_for_anonymous::<Node::ConcreteElement>(
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&self.context.shared_context().guards,
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&style::selector_parser::PseudoElement::ServoAnonymousBox,
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&self.info.style,
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),
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)
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} else {
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None
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};
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let mut children: Vec<ModernItem> = std::mem::take(&mut self.jobs)
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.into_par_iter()
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.filter_map(|job| match job {
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ModernContainerJob::TextRuns(runs) => {
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let mut inline_formatting_context_builder =
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InlineFormattingContextBuilder::new();
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for flex_text_run in runs.into_iter() {
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inline_formatting_context_builder
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.push_text(flex_text_run.text, &flex_text_run.info);
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}
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let inline_formatting_context = inline_formatting_context_builder.finish(
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self.context,
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self.text_decoration_line,
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true, /* has_first_formatted_line */
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false, /* is_single_line_text_box */
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self.info.style.writing_mode.to_bidi_level(),
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)?;
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let block_formatting_context = BlockFormattingContext::from_block_container(
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BlockContainer::InlineFormattingContext(inline_formatting_context),
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);
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let info = &self.info.new_anonymous(anonymous_style.clone().unwrap());
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let non_replaced = NonReplacedFormattingContext {
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base_fragment_info: info.into(),
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style: info.style.clone(),
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content_sizes_result: Default::default(),
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contents: NonReplacedFormattingContextContents::Flow(
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block_formatting_context,
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),
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};
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let formatting_context =
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IndependentFormattingContext::NonReplaced(non_replaced);
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Some(ModernItem {
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kind: ModernItemKind::InFlow,
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order: 0,
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box_slot: None,
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formatting_context,
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})
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},
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ModernContainerJob::ElementOrPseudoElement {
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info,
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display,
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contents,
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box_slot,
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} => {
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let is_abspos = info.style.get_box().position.is_absolutely_positioned();
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let formatting_context = IndependentFormattingContext::construct(
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self.context,
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&info,
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display.display_inside(),
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contents,
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// Text decorations are not propagated to any out-of-flow descendants.
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if is_abspos {
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TextDecorationLine::NONE
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} else {
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self.text_decoration_line
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},
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);
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if is_abspos {
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Some(ModernItem {
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kind: ModernItemKind::OutOfFlow,
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order: 0,
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box_slot: Some(box_slot),
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formatting_context,
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})
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} else {
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Some(ModernItem {
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kind: ModernItemKind::InFlow,
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order: info.style.clone_order(),
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box_slot: Some(box_slot),
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formatting_context,
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})
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}
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},
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})
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.collect::<Vec<_>>();
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// https://drafts.csswg.org/css-flexbox/#order-modified-document-order
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children.sort_by_key(|child| child.order);
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children
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}
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}
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