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LibWeb: Compute content width before static position for abspos elements

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In some scenarios, correctly computing the static position may depend on
the content width having been calculated beforehand.
This commit is contained in:
implicitfield 2024-03-02 21:53:25 +04:00 • committed by Andreas Kling
parent 18fe86adc3
commit e3b1d4a141
3 changed files with 72 additions and 4 deletions
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17
Userland/Libraries/LibWeb/Layout/FormattingContext.cpp
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@ -656,7 +656,7 @@ CSSPixels FormattingContext::compute_height_for_replaced_element(Box const& box,
void FormattingContext::compute_width_for_absolutely_positioned_non_replaced_element(Box const& box, AvailableSpace const& available_space)
{
auto width_of_containing_block = available_space.width.to_px_or_zero();
auto& computed_values = box.computed_values();
auto const& computed_values = box.computed_values();
auto zero_value = CSS::Length::make_px(0);
auto margin_left = CSS::Length::make_auto();
@ -699,10 +699,20 @@ void FormattingContext::compute_width_for_absolutely_positioned_non_replaced_ele
// Then, if the 'direction' property of the element establishing the static-position containing block
// is 'ltr' set 'left' to the static position and apply rule number three below;
// otherwise, set 'right' to the static position and apply rule number one below.
// FIXME: This is very hackish.
// NOTE: As with compute_height_for_absolutely_positioned_non_replaced_element, we actually apply these
// steps in the opposite order since the static position may depend on the width of the box.
auto result = calculate_shrink_to_fit_widths(box);
auto available_width = solve_for_width();
CSSPixels content_width = min(max(result.preferred_minimum_width, available_width.to_px(box)), result.preferred_width);
width = CSS::Length::make_px(content_width);
m_state.get_mutable(box).set_content_width(content_width);
auto static_position = calculate_static_position(box);
left = static_position.x();
goto Rule3;
right = solve_for_right();
}
// If none of the three is auto:
@ -765,7 +775,6 @@ void FormattingContext::compute_width_for_absolutely_positioned_non_replaced_ele
// 3. 'width' and 'right' are 'auto' and 'left' is not 'auto',
// then the width is shrink-to-fit. Then solve for 'right'
else if (width.is_auto() && computed_right.is_auto() && !computed_left.is_auto()) {
Rule3:
auto result = calculate_shrink_to_fit_widths(box);
auto available_width = solve_for_width();
width = CSS::Length::make_px(min(max(result.preferred_minimum_width, available_width.to_px(box)), result.preferred_width));