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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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10
components/layout/query.rs
View file

@ -9,7 +9,7 @@ use crate::context::LayoutContext;
use crate::display_list::items::{DisplayList, OpaqueNode, ScrollOffsetMap};
use crate::display_list::IndexableText;
use crate::flow::{Flow, GetBaseFlow};
use crate::fragment::{Fragment, FragmentBorderBoxIterator, SpecificFragmentInfo};
use crate::fragment::{Fragment, FragmentBorderBoxIterator, FragmentFlags, SpecificFragmentInfo};
use crate::inline::InlineFragmentNodeFlags;
use crate::opaque_node::OpaqueNodeMethods;
use crate::sequential;
@ -666,11 +666,9 @@ impl FragmentBorderBoxIterator for ParentOffsetBorderBoxIterator {
self.has_processed_node = true;
}
} else if self.node_offset_box.is_none() {
// TODO(gw): Is there a less fragile way of checking whether this
// fragment is the body element, rather than just checking that
// it's at level 1 (below the root node)?
let is_body_element = level == 1;
let is_body_element = fragment
.flags
.contains(FragmentFlags::IS_BODY_ELEMENT_OF_HTML_ELEMENT_ROOT);
let is_valid_parent = match (
is_body_element,
fragment.style.get_box().position,