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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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34
Tests/LibWeb/Layout/expected/abspos-flexbox-with-auto-width.txt Normal file
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@ -0,0 +1,34 @@
Viewport <#document> at (0,0) content-size 800x600 children: not-inline
BlockContainer <html> at (0,0) content-size 800x116 [BFC] children: not-inline
BlockContainer <body> at (8,8) content-size 784x100 children: not-inline
BlockContainer <div#containing-block> at (8,8) content-size 200x100 children: not-inline
BlockContainer <(anonymous)> at (8,8) content-size 200x0 children: inline
TextNode <#text>
Box <div#inner-flex> at (8,8) content-size 200x0 flex-container(row) [FFC] children: not-inline
BlockContainer <(anonymous)> (not painted) [BFC] children: inline
TextNode <#text>
BlockContainer <div> at (83,8) content-size 50x100 positioned [BFC] children: not-inline
BlockContainer <(anonymous)> at (83,8) content-size 50x0 children: inline
TextNode <#text>
BlockContainer <span> at (83,8) content-size 50x0 children: not-inline
BlockContainer <(anonymous)> at (83,8) content-size 50x0 children: inline
TextNode <#text>
BlockContainer <(anonymous)> (not painted) [BFC] children: inline
TextNode <#text>
BlockContainer <(anonymous)> at (8,8) content-size 200x0 children: inline
TextNode <#text>
BlockContainer <(anonymous)> at (8,108) content-size 784x0 children: inline
TextNode <#text>
ViewportPaintable (Viewport<#document>) [0,0 800x600]
PaintableWithLines (BlockContainer<HTML>) [0,0 800x116]
PaintableWithLines (BlockContainer<BODY>) [8,8 784x100]
PaintableWithLines (BlockContainer<DIV>#containing-block) [8,8 200x100]
PaintableWithLines (BlockContainer(anonymous)) [8,8 200x0]
PaintableBox (Box<DIV>#inner-flex) [8,8 200x0] overflow: [83,8 50x100]
PaintableWithLines (BlockContainer<DIV>) [83,8 50x100]
PaintableWithLines (BlockContainer(anonymous)) [83,8 50x0]
PaintableWithLines (BlockContainer<SPAN>) [83,8 50x0]
PaintableWithLines (BlockContainer(anonymous)) [83,8 50x0]
PaintableWithLines (BlockContainer(anonymous)) [8,8 200x0]
PaintableWithLines (BlockContainer(anonymous)) [8,108 784x0]

25
Tests/LibWeb/Layout/input/abspos-flexbox-with-auto-width.html Normal file
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@ -0,0 +1,25 @@
<!DOCTYPE html>
<style>
#containing-block {
width: 200px;
height: 100px;
background: red;
}
#inner-flex {
display: flex;
justify-content: center;
}
span {
display: block;
width: 50px;
}
</style>
<div id="containing-block">
<div id="inner-flex">
<div style="position: absolute; height: 100px; background: green;">
<span></span>
</div>
</div>
</div>

17
Userland/Libraries/LibWeb/Layout/FormattingContext.cpp
View file

@ -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) 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 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 zero_value = CSS::Length::make_px(0);
auto margin_left = CSS::Length::make_auto(); 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 // 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; // 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. // 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); auto static_position = calculate_static_position(box);
left = static_position.x(); left = static_position.x();
goto Rule3; right = solve_for_right();
} }
// If none of the three is auto: // 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', // 3. 'width' and 'right' are 'auto' and 'left' is not 'auto',
// then the width is shrink-to-fit. Then solve for 'right' // then the width is shrink-to-fit. Then solve for 'right'
else if (width.is_auto() && computed_right.is_auto() && !computed_left.is_auto()) { else if (width.is_auto() && computed_right.is_auto() && !computed_left.is_auto()) {
Rule3:
auto result = calculate_shrink_to_fit_widths(box); auto result = calculate_shrink_to_fit_widths(box);
auto available_width = solve_for_width(); 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)); width = CSS::Length::make_px(min(max(result.preferred_minimum_width, available_width.to_px(box)), result.preferred_width));