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layout: Collect both start and end baselines for fragments (#31230)

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This change starts collecting the starting baseline set for fragments,
which is necessary for some layout modes (flex and tables, namely) as
well as being important for the implementation of `align-items`. In
addition, it converts baseline measurement to use `Au` everywhere.

Co-authored-by: Oriol Brufau <obrufau@igalia.com>
This commit is contained in:
Martin Robinson 2024-02-05 19:06:05 +01:00 • committed by GitHub
parent 28bde741ed
commit 7f13316f24
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GPG key ID: B5690EEEBB952194
10 changed files with 112 additions and 101 deletions
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7
components/layout_2020/flexbox/layout.rs
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@ -25,7 +25,7 @@ use super::geom::{
use super::{FlexContainer, FlexLevelBox};
use crate::cell::ArcRefCell;
use crate::context::LayoutContext;
use crate::formatting_contexts::{IndependentFormattingContext, IndependentLayout};
use crate::formatting_contexts::{Baselines, IndependentFormattingContext, IndependentLayout};
use crate::fragment_tree::{BoxFragment, CollapsedBlockMargins, Fragment};
use crate::geom::{AuOrAuto, LengthOrAuto, LogicalRect, LogicalSides, LogicalVec2};
use crate::positioned::{AbsolutelyPositionedBox, PositioningContext, PositioningContextLength};
@ -410,7 +410,7 @@ impl FlexContainer {
IndependentLayout {
fragments,
content_block_size: content_block_size.into(),
last_inflow_baseline_offset: None,
baselines: Baselines::default(),
}
}
}
@ -848,6 +848,7 @@ impl FlexLine<'_> {
let margin = flex_context.sides_to_flow_relative(*margin);
let collapsed_margin = CollapsedBlockMargins::from_margin(&margin);
(
// TODO: We should likely propagate baselines from `display: flex`.
BoxFragment::new(
item.box_.base_fragment_info(),
item.box_.style().clone(),
@ -857,8 +858,6 @@ impl FlexLine<'_> {
flex_context.sides_to_flow_relative(item.border.map(|t| (*t).into())),
margin,
None, /* clearance */
// TODO: We should likely propagate baselines from `display: flex`.
None, /* last_inflow_baseline_offset */
collapsed_margin,
),
item_result.positioning_context,