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LibWeb: Mark fixed-length abspos element sizes as definite

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In particular, these two interesting cases:

- The containing block of an abspos box is always definite from the
  perspective of the abspos box.

- When resolving abspos box sizes from two opposing fixed insets,
  we now mark those sizes as definite (since no layout was required
  to resolve them).
This commit is contained in:
Andreas Kling 2024-02-21 15:22:31 +01:00
parent 70ce77fc72
commit 221650f3cd
1 changed files with 15 additions and 0 deletions
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15
Userland/Libraries/LibWeb/Layout/FormattingContext.cpp
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@ -1110,6 +1110,12 @@ CSSPixelPoint FormattingContext::calculate_static_position(Box const& box) const
void FormattingContext::layout_absolutely_positioned_element(Box const& box, AvailableSpace const& available_space)
{
auto& containing_block_state = m_state.get_mutable(*box.containing_block());
// The size of the containing block of an abspos box is always definite from the perspective of the abspos box.
// Since abspos boxes are laid out last, we can mark the containing block as having definite sizes at this point.
containing_block_state.set_has_definite_width(true);
containing_block_state.set_has_definite_height(true);
auto& box_state = m_state.get_mutable(box);
// The border computed values are not changed by the compute_height & width calculations below.
@ -1126,6 +1132,15 @@ void FormattingContext::layout_absolutely_positioned_element(Box const& box, Ava
// In some situations, e.g with non-auto top & bottom values, the height can be determined early.
compute_height_for_absolutely_positioned_element(box, available_space, BeforeOrAfterInsideLayout::Before);
// If the box width and/or height is fixed and/or or resolved from inset properties,
// mark the size as being definite (since layout was not required to resolve it, per CSS-SIZING-3).
if (box.computed_values().inset().left().is_length() && box.computed_values().inset().right().is_length()) {
box_state.set_has_definite_width(true);
}
if (box.computed_values().inset().top().is_length() && box.computed_values().inset().bottom().is_length()) {
box_state.set_has_definite_height(true);
}
auto independent_formatting_context = layout_inside(box, LayoutMode::Normal, box_state.available_inner_space_or_constraints_from(available_space));
compute_height_for_absolutely_positioned_element(box, available_space, BeforeOrAfterInsideLayout::After);