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layout: Allow layouts to customize their used style (#35012)

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Some layouts like table need some style overrides. We were handling this
in `ComputedValuesExt`, but it was messy, unreliable and too limited.

For example, we were assuming that a style with `display: table` would
belong to a table wrapper box or table grid box. However, certain HTML
elements can ignore their `display` value and generate a different kind
of box. I think we aren't doing that yet, but we will need this.

Also, resolving the used border of a table needs layout information,
which we don't have in `ComputedValuesExt`. This patch will allow to
improve border collapsing in a follow-up.

Signed-off-by: Oriol Brufau <obrufau@igalia.com>
This commit is contained in:
Oriol Brufau 2025-01-16 08:54:47 -08:00 • committed by GitHub
parent 7e7792dfbd
commit 60dc3b26fb
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11 changed files with 368 additions and 238 deletions
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8
components/layout_2020/replaced.rs
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@ -31,8 +31,9 @@ use crate::context::LayoutContext;
use crate::dom::NodeExt;
use crate::fragment_tree::{BaseFragmentInfo, Fragment, IFrameFragment, ImageFragment};
use crate::geom::{LogicalVec2, PhysicalPoint, PhysicalRect, PhysicalSize, Size, Sizes};
use crate::layout_box_base::LayoutBoxBase;
use crate::sizing::{ComputeInlineContentSizes, ContentSizes, InlineContentSizesResult};
use crate::style_ext::{AspectRatio, Clamp, ComputedValuesExt, ContentBoxSizesAndPBM};
use crate::style_ext::{AspectRatio, Clamp, ComputedValuesExt, ContentBoxSizesAndPBM, LayoutStyle};
use crate::{ConstraintSpace, ContainingBlock, SizeConstraint};
#[derive(Debug)]
@ -567,6 +568,11 @@ impl ReplacedContents {
block: block_size,
}
}
#[inline]
pub(crate) fn layout_style<'a>(&self, base: &'a LayoutBoxBase) -> LayoutStyle<'a> {
LayoutStyle::Default(&base.style)
}
}
impl ComputeInlineContentSizes for ReplacedContents {