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Detect body elements during layout

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During layout it is often useful, for various specification reasons, to
know if an element is the `<body>` element of an `<html>` element root. There
are a couple places where a brittle heuristic is used to detect `<body>`
elements. This information is going to be even more important to
properly handle `<html>` elements that inherit their overflow property from
their `<body>` children.

Implementing this properly requires updating the DOM wrapper interface.
This check does reach up to the parent of thread-safe nodes, but this is
essentially the same kind of operation that `parent_style()` does, so is
ostensibly safe.

This change should not change any behavior and is just a preparation
step for properly handle `<body>` overflow.
This commit is contained in:
Martin Robinson 2023-04-30 20:21:58 +02:00
parent 77a184a0e7
commit 72302e2dae
26 changed files with 487 additions and 277 deletions
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9
components/layout_2020/flow/construct.rs
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@ -12,7 +12,6 @@ use crate::flow::float::FloatBox;
use crate::flow::inline::{InlineBox, InlineFormattingContext, InlineLevelBox, TextRun};
use crate::flow::{BlockContainer, BlockFormattingContext, BlockLevelBox};
use crate::formatting_contexts::IndependentFormattingContext;
use crate::fragments::Tag;
use crate::positioned::AbsolutelyPositionedBox;
use crate::style_ext::{DisplayGeneratingBox, DisplayInside, DisplayOutside};
use rayon::iter::{IntoParallelIterator, ParallelIterator};
@ -384,7 +383,7 @@ where
if let Some(text) = new_text_run_contents {
inlines.push(ArcRefCell::new(InlineLevelBox::TextRun(TextRun {
tag: Tag::from_node_and_style_info(info),
base_fragment_info: info.into(),
parent_style: Arc::clone(&info.style),
text,
})))
@ -495,7 +494,7 @@ where
// Whatever happened before, all we need to do before recurring
// is to remember this ongoing inline level box.
self.ongoing_inline_boxes_stack.push(InlineBox {
tag: Tag::from_node_and_style_info(info),
base_fragment_info: info.into(),
style: info.style.clone(),
first_fragment: true,
last_fragment: false,
@ -556,7 +555,7 @@ where
.rev()
.map(|ongoing| {
let fragmented = InlineBox {
tag: ongoing.tag,
base_fragment_info: ongoing.base_fragment_info,
style: ongoing.style.clone(),
first_fragment: ongoing.first_fragment,
// The fragmented boxes before the block level element
@ -755,7 +754,7 @@ where
BlockLevelCreator::SameFormattingContextBlock(contents) => {
let (contents, contains_floats) = contents.finish(context, info);
let block_level_box = ArcRefCell::new(BlockLevelBox::SameFormattingContextBlock {
tag: Tag::from_node_and_style_info(info),
base_fragment_info: info.into(),
contents,
style: Arc::clone(&info.style),
});