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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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21
components/layout_2020/flow/inline.rs
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@ -7,9 +7,9 @@ use crate::context::LayoutContext;
use crate::flow::float::FloatBox;
use crate::flow::FlowLayout;
use crate::formatting_contexts::IndependentFormattingContext;
use crate::fragment_tree::BaseFragmentInfo;
use crate::fragments::{
AnonymousFragment, BoxFragment, CollapsedBlockMargins, DebugId, FontMetrics, Fragment, Tag,
TextFragment,
AnonymousFragment, BoxFragment, CollapsedBlockMargins, FontMetrics, Fragment, TextFragment,
};
use crate::geom::flow_relative::{Rect, Sides, Vec2};
use crate::positioned::{
@ -51,7 +51,7 @@ pub(crate) enum InlineLevelBox {
#[derive(Debug, Serialize)]
pub(crate) struct InlineBox {
pub tag: Tag,
pub base_fragment_info: BaseFragmentInfo,
#[serde(skip_serializing)]
pub style: Arc<ComputedValues>,
pub first_fragment: bool,
@ -62,7 +62,7 @@ pub(crate) struct InlineBox {
/// https://www.w3.org/TR/css-display-3/#css-text-run
#[derive(Debug, Serialize)]
pub(crate) struct TextRun {
pub tag: Tag,
pub base_fragment_info: BaseFragmentInfo,
#[serde(skip_serializing)]
pub parent_style: Arc<ComputedValues>,
pub text: String,
@ -82,7 +82,7 @@ struct InlineNestingLevelState<'box_tree> {
}
struct PartialInlineBoxFragment<'box_tree> {
tag: Tag,
base_fragment_info: BaseFragmentInfo,
style: Arc<ComputedValues>,
start_corner: Vec2<Length>,
padding: Sides<Length>,
@ -471,7 +471,7 @@ impl InlineBox {
let text_decoration_line =
ifc.current_nesting_level.text_decoration_line | style.clone_text_decoration_line();
PartialInlineBoxFragment {
tag: self.tag,
base_fragment_info: self.base_fragment_info,
style,
start_corner,
padding,
@ -512,7 +512,7 @@ impl<'box_tree> PartialInlineBoxFragment<'box_tree> {
};
let mut fragment = BoxFragment::new(
self.tag,
self.base_fragment_info,
self.style.clone(),
std::mem::take(&mut nesting_level.fragments_so_far),
content_rect,
@ -580,7 +580,7 @@ fn layout_atomic(
.make_fragments(&replaced.style, size.clone());
let content_rect = Rect { start_corner, size };
BoxFragment::new(
replaced.tag,
replaced.base_fragment_info,
replaced.style.clone(),
fragments,
content_rect,
@ -655,7 +655,7 @@ fn layout_atomic(
},
};
BoxFragment::new(
non_replaced.tag,
non_replaced.base_fragment_info,
non_replaced.style.clone(),
independent_layout.fragments,
content_rect,
@ -836,8 +836,7 @@ impl TextRun {
ifc.current_nesting_level
.fragments_so_far
.push(Fragment::Text(TextFragment {
tag: self.tag,
debug_id: DebugId::new(),
base: self.base_fragment_info.into(),
parent_style: self.parent_style.clone(),
rect,
font_metrics,