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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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15
components/layout/flow.rs
View file

@ -967,13 +967,23 @@ impl fmt::Debug for BaseFlow {
"".to_owned()
};
let flags_string = if !self.flags.is_empty() {
format!("\nflags={:?}", self.flags)
} else {
"".to_owned()
};
write!(
f,
"\nsc={:?}\
\npos={:?}{}{}\
\nfloatspec-in={:?}\
\nfloatspec-out={:?}\
\noverflow={:?}{}{}{}",
\noverflow={:?}\
{child_count_string}\
{absolute_descendants_string}\
{damage_string}\
{flags_string}",
self.stacking_context_id,
self.position,
if self.flags.contains(FlowFlags::FLOATS_LEFT) {
@ -989,9 +999,6 @@ impl fmt::Debug for BaseFlow {
self.speculated_float_placement_in,
self.speculated_float_placement_out,
self.overflow,
child_count_string,
absolute_descendants_string,
damage_string
)
}
}