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LibWeb: Add "position: sticky" support

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Sticky positioning is implemented by modifying the algorithm for
assigning and refreshing scroll frames. Now, elements with
"position: sticky" are assigned their own scroll frame, and their
position is refreshed independently from regular scroll boxes.
Refreshing the scroll offsets for sticky boxes does not require display
list invalidation.

A separate hash map is used for the scroll frames of sticky boxes. This
is necessary because a single paintable box can have two scroll frames
if it 1) has "position: sticky" and 2) contains scrollable overflow.
This commit is contained in:
Aliaksandr Kalenik 2024-08-24 19:20:31 +02:00 • committed by Alexander Kalenik
commit 30b636e90b
Notes: github-actions[bot] 2024-08-30 17:03:56 +00:00
20 changed files with 705 additions and 2 deletions
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1
Userland/Libraries/LibWeb/Painting/Paintable.cpp
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@ -26,6 +26,7 @@ Paintable::Paintable(Layout::Node const& layout_node)
}
m_fixed_position = computed_values.position() == CSS::Positioning::Fixed;
m_sticky_position = computed_values.position() == CSS::Positioning::Sticky;
m_absolutely_positioned = computed_values.position() == CSS::Positioning::Absolute;
m_floating = layout_node.is_floating();
m_inline = layout_node.is_inline();