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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/. */
use crate::cell::ArcRefCell;
use crate::context::LayoutContext;
use crate::dom_traversal::{
BoxSlot, Contents, NodeAndStyleInfo, NodeExt, NonReplacedContents, TraversalHandler,
};
use crate::element_data::LayoutBox;
use crate::formatting_contexts::{IndependentFormattingContext, IndependentLayout};
use crate::fragments::Tag;
use crate::positioned::{AbsolutelyPositionedBox, PositioningContext};
use crate::sizing::{BoxContentSizes, ContentSizes, ContentSizesRequest};
use crate::style_ext::DisplayGeneratingBox;
use crate::ContainingBlock;
use rayon::iter::{IntoParallelIterator, ParallelIterator};
use servo_arc::Arc;
use std::borrow::Cow;
use style::values::computed::Length;
use style::values::specified::text::TextDecorationLine;
use style::Zero;
// FIXME: `min-width: auto` is not zero: https://drafts.csswg.org/css-flexbox/#min-size-auto
#[derive(Debug, Serialize)]
pub(crate) struct FlexContainer {
children: Vec<ArcRefCell<FlexLevelBox>>,
}
#[derive(Debug, Serialize)]
pub(crate) enum FlexLevelBox {
FlexItem(IndependentFormattingContext),
OutOfFlowAbsolutelyPositionedBox(Arc<AbsolutelyPositionedBox>),
}
impl FlexContainer {
pub fn construct<'dom>(
context: &LayoutContext,
info: &NodeAndStyleInfo<impl NodeExt<'dom>>,
contents: NonReplacedContents,
content_sizes: ContentSizesRequest,
propagated_text_decoration_line: TextDecorationLine,
) -> (Self, BoxContentSizes) {
let text_decoration_line =
propagated_text_decoration_line | info.style.clone_text_decoration_line();
let mut builder = FlexContainerBuilder {
context,
info,
text_decoration_line,
contiguous_text_runs: Vec::new(),
jobs: Vec::new(),
has_text_runs: false,
};
contents.traverse(context, info, &mut builder);
let content_sizes = content_sizes.compute(|| {
// FIXME
ContentSizes::zero()
});
(builder.finish(), content_sizes)
}
}
/// https://drafts.csswg.org/css-flexbox/#flex-items
struct FlexContainerBuilder<'a, 'dom, Node> {
context: &'a LayoutContext<'a>,
info: &'a NodeAndStyleInfo<Node>,
text_decoration_line: TextDecorationLine,
contiguous_text_runs: Vec<TextRun<'dom, Node>>,
/// To be run in parallel with rayon in `finish`
jobs: Vec<FlexLevelJob<'dom, Node>>,
has_text_runs: bool,
}
enum FlexLevelJob<'dom, Node> {
/// Or pseudo-element
Element {
info: NodeAndStyleInfo<Node>,
display: DisplayGeneratingBox,
contents: Contents,
box_slot: BoxSlot<'dom>,
},
TextRuns(Vec<TextRun<'dom, Node>>),
}
struct TextRun<'dom, Node> {
info: NodeAndStyleInfo<Node>,
text: Cow<'dom, str>,
}
impl<'a, 'dom, Node: 'dom> TraversalHandler<'dom, Node> for FlexContainerBuilder<'a, 'dom, Node>
where
Node: NodeExt<'dom>,
{
fn handle_text(&mut self, info: &NodeAndStyleInfo<Node>, text: Cow<'dom, str>) {
self.contiguous_text_runs.push(TextRun {
info: info.clone(),
text,
})
}
/// Or pseudo-element
fn handle_element(
&mut self,
info: &NodeAndStyleInfo<Node>,
display: DisplayGeneratingBox,
contents: Contents,
box_slot: BoxSlot<'dom>,
) {
// FIXME: are text runs considered "contiguous" if they are only separated
// by an out-of-flow abspos element?
// (That is, are they wrapped in the same anonymous flex item, or each its own?)
self.wrap_any_text_in_anonymous_block_container();
self.jobs.push(FlexLevelJob::Element {
info: info.clone(),
display,
contents,
box_slot,
})
}
}
/// https://drafts.csswg.org/css-text/#white-space
fn is_only_document_white_space<Node>(run: &TextRun<'_, Node>) -> bool {
// FIXME: is this the right definition? See
// https://github.com/w3c/csswg-drafts/issues/5146
// https://github.com/w3c/csswg-drafts/issues/5147
run.text
.bytes()
.all(|byte| matches!(byte, b' ' | b'\n' | b'\t'))
}
impl<'a, 'dom, Node: 'dom> FlexContainerBuilder<'a, 'dom, Node>
where
Node: NodeExt<'dom>,
{
fn wrap_any_text_in_anonymous_block_container(&mut self) {
let runs = std::mem::take(&mut self.contiguous_text_runs);
if runs.iter().all(is_only_document_white_space) {
// There is no text run, or they all only contain document white space characters
} else {
self.jobs.push(FlexLevelJob::TextRuns(runs));
self.has_text_runs = true;
}
}
fn finish(mut self) -> FlexContainer {
self.wrap_any_text_in_anonymous_block_container();
let anonymous_style = if self.has_text_runs {
Some(
self.context
.shared_context()
.stylist
.style_for_anonymous::<Node::ConcreteElement>(
&self.context.shared_context().guards,
&style::selector_parser::PseudoElement::ServoText,
&self.info.style,
),
)
} else {
None
};
let mut children = std::mem::take(&mut self.jobs)
.into_par_iter()
.map(|job| match job {
FlexLevelJob::TextRuns(runs) => ArcRefCell::new(FlexLevelBox::FlexItem(
IndependentFormattingContext::construct_for_text_runs(
self.context,
&self
.info
.new_replacing_style(anonymous_style.clone().unwrap()),
runs.into_iter().map(|run| crate::flow::inline::TextRun {
tag: Tag::from_node_and_style_info(&run.info),
text: run.text.into(),
parent_style: run.info.style,
}),
ContentSizesRequest::None, // FIXME: request sizes when we start using them
self.text_decoration_line,
),
)),
FlexLevelJob::Element {
info,
display,
contents,
box_slot,
} => {
let display_inside = match display {
DisplayGeneratingBox::OutsideInside { inside, .. } => inside,
};
let box_ = if info.style.get_box().position.is_absolutely_positioned() {
// https://drafts.csswg.org/css-flexbox/#abspos-items
ArcRefCell::new(FlexLevelBox::OutOfFlowAbsolutelyPositionedBox(Arc::new(
AbsolutelyPositionedBox::construct(
self.context,
&info,
display_inside,
contents,
),
)))
} else {
ArcRefCell::new(FlexLevelBox::FlexItem(
IndependentFormattingContext::construct(
self.context,
&info,
display_inside,
contents,
ContentSizesRequest::None, // FIXME: request sizes when we start using them
self.text_decoration_line,
),
))
};
box_slot.set(LayoutBox::FlexLevel(box_.clone()));
box_
},
})
.collect::<Vec<_>>();
// https://drafts.csswg.org/css-flexbox/#order-modified-document-order
children.sort_by_key(|child| match &*child.borrow() {
FlexLevelBox::FlexItem(item) => item.style.clone_order(),
// “Absolutely-positioned children of a flex container are treated
// as having order: 0 for the purpose of determining their painting order
// relative to flex items.”
FlexLevelBox::OutOfFlowAbsolutelyPositionedBox(_) => 0,
});
FlexContainer { children }
}
}
impl FlexContainer {
pub(crate) fn layout(
&self,
layout_context: &LayoutContext,
positioning_context: &mut PositioningContext,
containing_block: &ContainingBlock,
tree_rank: usize,
) -> IndependentLayout {
// FIXME
let _ = layout_context;
let _ = positioning_context;
let _ = containing_block;
let _ = tree_rank;
IndependentLayout {
fragments: Vec::new(),
content_block_size: Length::zero(),
}
}
}
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