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LibWeb: Move FFC layout algorithm step 8 to a separate function

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This commit is contained in:
Andreas Kling 2021-10-13 22:17:33 +02:00
parent 3402584646
commit 8f027b4792
Notes: sideshowbarker 2024-07-18 02:46:31 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/8f027b47920
2 changed files with 36 additions and 28 deletions
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62
Userland/Libraries/LibWeb/Layout/FlexFormattingContext.cpp
View File

@ -109,33 +109,7 @@ void FlexFormattingContext::run(Box& flex_container, LayoutMode)
}
// 8. Calculate the cross size of each flex line.
if (flex_lines.size() == 1 && has_definite_cross_size(flex_container)) {
flex_lines[0].cross_size = specified_cross_size(flex_container);
} else {
for (auto& flex_line : flex_lines) {
// FIXME: Implement 8.1
// FIXME: This isn't spec but makes sense here
if (has_definite_cross_size(flex_container) && flex_container.computed_values().align_items() == CSS::AlignItems::Stretch) {
flex_line.cross_size = specified_cross_size(flex_container) / flex_lines.size();
continue;
}
// 8.2
float largest_hypothetical_cross_size = 0;
for (auto& flex_item : flex_line.items) {
if (largest_hypothetical_cross_size < flex_item->hypothetical_cross_size_with_margins())
largest_hypothetical_cross_size = flex_item->hypothetical_cross_size_with_margins();
}
// 8.3
flex_line.cross_size = max(0.0f, largest_hypothetical_cross_size);
}
if (flex_lines.size() == 1) {
clamp(flex_lines[0].cross_size, cross_min_size, cross_max_size);
}
}
calculate_cross_size_of_each_flex_line(flex_container, flex_lines, cross_min_size, cross_max_size);
// 9. Handle 'align-content: stretch'.
// FIXME: This
@ -930,6 +904,38 @@ float FlexFormattingContext::determine_hypothetical_cross_size_of_item(Box& box)
BlockFormattingContext context(verify_cast<BlockContainer>(box), this);
context.compute_width(box);
return box.width();
};
}
// https://www.w3.org/TR/css-flexbox-1/#algo-cross-line
void FlexFormattingContext::calculate_cross_size_of_each_flex_line(const Box& flex_container, Vector<FlexLine>& flex_lines, float cross_min_size, float cross_max_size)
{
if (flex_lines.size() == 1 && has_definite_cross_size(flex_container)) {
flex_lines[0].cross_size = specified_cross_size(flex_container);
} else {
for (auto& flex_line : flex_lines) {
// FIXME: Implement 8.1
// FIXME: This isn't spec but makes sense here
if (has_definite_cross_size(flex_container) && flex_container.computed_values().align_items() == CSS::AlignItems::Stretch) {
flex_line.cross_size = specified_cross_size(flex_container) / flex_lines.size();
continue;
}
// 8.2
float largest_hypothetical_cross_size = 0;
for (auto& flex_item : flex_line.items) {
if (largest_hypothetical_cross_size < flex_item->hypothetical_cross_size_with_margins())
largest_hypothetical_cross_size = flex_item->hypothetical_cross_size_with_margins();
}
// 8.3
flex_line.cross_size = max(0.0f, largest_hypothetical_cross_size);
}
if (flex_lines.size() == 1) {
clamp(flex_lines[0].cross_size, cross_min_size, cross_max_size);
}
}
}
}

2
Userland/Libraries/LibWeb/Layout/FlexFormattingContext.h
View File

@ -68,6 +68,8 @@ private:
float determine_hypothetical_cross_size_of_item(Box&);
void calculate_cross_size_of_each_flex_line(Box const& flex_container, Vector<FlexLine>&, float cross_min_size, float cross_max_size);
bool is_row_layout() const { return m_flex_direction == CSS::FlexDirection::Row || m_flex_direction == CSS::FlexDirection::RowReverse; }
CSS::FlexDirection m_flex_direction {};