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LibWeb: Rewrite FFC "resolve flexible lengths" algorithm from draft spec

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The draft CSS-FLEXBOX-1 spec had a more detailed description of this
algorithm, so let's use that as our basis for the implementation.

Test by Aliaksandr. :^)
This commit is contained in:
Andreas Kling 2023-03-08 21:18:35 +01:00
parent 1cd61723f0
commit 109ed27423
4 changed files with 268 additions and 149 deletions
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18
Userland/Libraries/LibWeb/Layout/FlexFormattingContext.h
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@ -61,6 +61,21 @@ private:
float scaled_flex_shrink_factor { 0 };
float desired_flex_fraction { 0 };
CSSPixels outer_hypothetical_main_size() const
{
return hypothetical_main_size + margins.main_before + margins.main_after + borders.main_before + borders.main_after + padding.main_before + padding.main_after;
}
CSSPixels outer_target_main_size() const
{
return target_main_size + margins.main_before + margins.main_after + borders.main_before + borders.main_after + padding.main_before + padding.main_after;
}
CSSPixels outer_flex_base_size() const
{
return flex_base_size + margins.main_before + margins.main_after + borders.main_before + borders.main_after + padding.main_before + padding.main_after;
}
// The used main size of this flex item. Empty until determined.
Optional<CSSPixels> main_size {};
@ -91,6 +106,9 @@ private:
CSSPixels cross_size { 0 };
CSSPixels remaining_free_space { 0 };
float chosen_flex_fraction { 0 };
float sum_of_flex_factor_of_unfrozen_items() const;
float sum_of_scaled_flex_shrink_factor_of_unfrozen_items() const;
};
bool has_definite_main_size(Box const&) const;