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LibWeb: Support flex item cross sizing based on intrinsic aspect ratio

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This patch implements case B from the "determine the flex base size
and hypothetical main size of each item" from the flexbox algorithm.

https://drafts.csswg.org/css-flexbox-1/#algo-main-item
This commit is contained in:
Andreas Kling 2022-07-07 12:39:24 +02:00
parent 8eb022a57d
commit 89e65e0ea1
2 changed files with 27 additions and 3 deletions
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28
Userland/Libraries/LibWeb/Layout/FlexFormattingContext.cpp
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@ -568,13 +568,35 @@ float FlexFormattingContext::calculate_indefinite_main_size(FlexItem const& item
return BlockFormattingContext::compute_theoretical_height(throwaway_state, item.box);
}
// https://drafts.csswg.org/css-flexbox-1/#propdef-flex-basis
CSS::FlexBasisData FlexFormattingContext::used_flex_basis_for_item(FlexItem const& item) const
{
auto flex_basis = item.box.computed_values().flex_basis();
if (flex_basis.type == CSS::FlexBasis::Auto) {
// https://drafts.csswg.org/css-flexbox-1/#valdef-flex-basis-auto
// When specified on a flex item, the auto keyword retrieves the value of the main size property as the used flex-basis.
// If that value is itself auto, then the used value is content.
auto const& main_size = is_row_layout() ? item.box.computed_values().width() : item.box.computed_values().height();
if (main_size.is_auto()) {
flex_basis.type = CSS::FlexBasis::Content;
} else {
flex_basis.type = CSS::FlexBasis::LengthPercentage;
flex_basis.length_percentage = main_size;
}
}
return flex_basis;
}
// https://www.w3.org/TR/css-flexbox-1/#algo-main-item
void FlexFormattingContext::determine_flex_base_size_and_hypothetical_main_size(FlexItem& flex_item)
{
auto& child_box = flex_item.box;
flex_item.flex_base_size = [&] {
auto const& used_flex_basis = child_box.computed_values().flex_basis();
auto used_flex_basis = used_flex_basis_for_item(flex_item);
// A. If the item has a definite used flex basis, that’s the flex base size.
if (used_flex_basis.is_definite()) {
@ -590,9 +612,9 @@ void FlexFormattingContext::determine_flex_base_size_and_hypothetical_main_size(
// - a definite cross size,
if (flex_item.box.has_intrinsic_aspect_ratio()
&& used_flex_basis.type == CSS::FlexBasis::Content
&& has_definite_cross_size(child_box)) {
TODO();
&& has_definite_cross_size(flex_item.box)) {
// flex_base_size is calculated from definite cross size and intrinsic aspect ratio
return resolved_definite_cross_size(flex_item.box) * flex_item.box.intrinsic_aspect_ratio().value();
}
// C. If the used flex basis is content or depends on its available space,