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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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19
components/layout_2020/flow/mod.rs
View file

@ -11,8 +11,9 @@ use crate::flow::inline::InlineFormattingContext;
use crate::formatting_contexts::{
IndependentFormattingContext, IndependentLayout, NonReplacedFormattingContext,
};
use crate::fragment_tree::BaseFragmentInfo;
use crate::fragments::{
AnonymousFragment, BoxFragment, CollapsedBlockMargins, CollapsedMargin, Fragment, Tag,
AnonymousFragment, BoxFragment, CollapsedBlockMargins, CollapsedMargin, Fragment,
};
use crate::geom::flow_relative::{Rect, Sides, Vec2};
use crate::positioned::{AbsolutelyPositionedBox, PositioningContext};
@ -50,7 +51,7 @@ pub(crate) enum BlockContainer {
#[derive(Debug, Serialize)]
pub(crate) enum BlockLevelBox {
SameFormattingContextBlock {
tag: Tag,
base_fragment_info: BaseFragmentInfo,
#[serde(skip_serializing)]
style: Arc<ComputedValues>,
contents: BlockContainer,
@ -306,7 +307,7 @@ impl BlockLevelBox {
) -> Fragment {
match self {
BlockLevelBox::SameFormattingContextBlock {
tag,
base_fragment_info: tag,
style,
contents,
} => Fragment::Box(positioning_context.layout_maybe_position_relative_fragment(
@ -335,7 +336,7 @@ impl BlockLevelBox {
|_positioning_context| {
layout_in_flow_replaced_block_level(
containing_block,
replaced.tag,
replaced.base_fragment_info,
&replaced.style,
&replaced.contents,
)
@ -352,7 +353,7 @@ impl BlockLevelBox {
layout_context,
positioning_context,
containing_block,
non_replaced.tag,
non_replaced.base_fragment_info,
&non_replaced.style,
NonReplacedContents::EstablishesAnIndependentFormattingContext(
non_replaced,
@ -420,7 +421,7 @@ fn layout_in_flow_non_replaced_block_level(
layout_context: &LayoutContext,
positioning_context: &mut PositioningContext,
containing_block: &ContainingBlock,
tag: Tag,
base_fragment_info: BaseFragmentInfo,
style: &Arc<ComputedValues>,
block_level_kind: NonReplacedContents,
tree_rank: usize,
@ -559,7 +560,7 @@ fn layout_in_flow_non_replaced_block_level(
},
};
BoxFragment::new(
tag,
base_fragment_info,
style.clone(),
fragments,
content_rect,
@ -575,7 +576,7 @@ fn layout_in_flow_non_replaced_block_level(
/// https://drafts.csswg.org/css2/visudet.html#inline-replaced-height
fn layout_in_flow_replaced_block_level<'a>(
containing_block: &ContainingBlock,
tag: Tag,
base_fragment_info: BaseFragmentInfo,
style: &Arc<ComputedValues>,
replaced: &ReplacedContent,
) -> BoxFragment {
@ -600,7 +601,7 @@ fn layout_in_flow_replaced_block_level<'a>(
};
let block_margins_collapsed_with_children = CollapsedBlockMargins::from_margin(&margin);
BoxFragment::new(
tag,
base_fragment_info,
style.clone(),
fragments,
content_rect,