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layout: Implement proper absolute child position for flexbox (#33346)

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This implements the requirements outlined in the [flexbox specification]
about how to position absolute children of flex containers. We must
establish a static position rectangle (to use if all insets are auto)
and also align the child into that rectangle.

[flebox specification]: https://drafts.csswg.org/css-flexbox/#abspos-items

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
Co-authored-by: Oriol Brufau <obrufau@igalia.com>
This commit is contained in:
Martin Robinson 2024-09-09 07:44:16 -07:00 • committed by GitHub
parent a3a86d5913
commit d169a82d2e
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20 changed files with 678 additions and 724 deletions
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32
components/layout_2020/flow/mod.rs
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@ -15,6 +15,7 @@ use style::computed_values::float::T as Float;
use style::logical_geometry::WritingMode;
use style::properties::ComputedValues;
use style::values::computed::{Length, LengthOrAuto, Size};
use style::values::specified::align::AlignFlags;
use style::values::specified::{Display, TextAlignKeyword};
use style::Zero;
@ -594,7 +595,6 @@ fn layout_block_level_children_in_parallel(
placement_state.place_fragment_and_update_baseline(&mut fragment, None);
child_positioning_context.adjust_static_position_of_hoisted_fragments(
&fragment,
containing_block.effective_writing_mode(),
PositioningContextLength::zero(),
);
positioning_context.append(child_positioning_context);
@ -632,7 +632,6 @@ fn layout_block_level_children_sequentially(
.place_fragment_and_update_baseline(&mut fragment, Some(sequential_layout_state));
positioning_context.adjust_static_position_of_hoisted_fragments(
&fragment,
containing_block.effective_writing_mode(),
positioning_context_length_before_layout,
);
@ -709,11 +708,14 @@ impl BlockLevelBox {
BlockLevelBox::OutOfFlowAbsolutelyPositionedBox(box_) => {
let hoisted_box = AbsolutelyPositionedBox::to_hoisted(
box_.clone(),
// This is incorrect, however we do not know the
// correct positioning until later, in place_block_level_fragment,
// and this value will be adjusted there
LogicalVec2::zero(),
containing_block,
// This is incorrect, however we do not know the correct positioning
// until later, in PlacementState::place_fragment, and this value will be
// adjusted there
PhysicalRect::zero(),
LogicalVec2 {
inline: AlignFlags::START,
block: AlignFlags::START,
},
);
let hoisted_fragment = hoisted_box.fragment.clone();
positioning_context.push(hoisted_box);
@ -1817,11 +1819,17 @@ impl PlacementState {
}
},
Fragment::AbsoluteOrFixedPositioned(fragment) => {
let offset = LogicalVec2 {
block: (self.current_margin.solve() + self.current_block_direction_position),
inline: Au::zero(),
};
fragment.borrow_mut().adjust_offsets(offset);
// The alignment of absolutes in block flow layout is always "start", so the size of
// the static position rectangle does not matter.
fragment.borrow_mut().static_position_rect = LogicalRect {
start_corner: LogicalVec2 {
block: (self.current_margin.solve() +
self.current_block_direction_position),
inline: Au::zero(),
},
size: LogicalVec2::zero(),
}
.to_physical(self.writing_mode);
},
Fragment::Float(box_fragment) => {
let sequential_layout_state = sequential_layout_state