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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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26
components/layout_2020/dom_traversal.rs
View file

@ -5,6 +5,7 @@
use crate::cell::ArcRefCell;
use crate::context::LayoutContext;
use crate::element_data::{LayoutBox, LayoutDataForElement};
use crate::fragment_tree::{BaseFragmentInfo, FragmentFlags, Tag};
use crate::geom::PhysicalSize;
use crate::replaced::{CanvasInfo, CanvasSource, ReplacedContent};
use crate::style_ext::{Display, DisplayGeneratingBox, DisplayInside, DisplayOutside};
@ -74,6 +75,31 @@ impl<Node: Clone> NodeAndStyleInfo<Node> {
}
}
impl<'dom, Node> From<&NodeAndStyleInfo<Node>> for BaseFragmentInfo
where
Node: NodeExt<'dom>,
{
fn from(info: &NodeAndStyleInfo<Node>) -> Self {
let pseudo = info.pseudo_element_type.map(|pseudo| match pseudo {
WhichPseudoElement::Before => PseudoElement::Before,
WhichPseudoElement::After => PseudoElement::After,
});
let threadsafe_node = info.node.to_threadsafe();
let flags = match threadsafe_node.as_element() {
Some(element) if element.is_body_element_of_html_element_root() => {
FragmentFlags::IS_BODY_ELEMENT_OF_HTML_ELEMENT_ROOT
},
_ => FragmentFlags::empty(),
};
Self {
tag: Tag::new_pseudo(threadsafe_node.opaque(), pseudo),
flags,
}
}
}
pub(super) enum Contents {
/// Refers to a DOM subtree, plus `::before` and `::after` pseudo-elements.
OfElement,