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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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5
Userland/Libraries/LibWeb/DOM/Document.cpp
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@ -5454,10 +5454,13 @@ RefPtr<Painting::DisplayList> Document::record_display_list(PaintConfig config)
display_list->set_device_pixels_per_css_pixel(page().client().device_pixels_per_css_pixel());
Vector<RefPtr<Painting::ScrollFrame>> scroll_state;
scroll_state.resize(viewport_paintable.scroll_state.size());
scroll_state.resize(viewport_paintable.scroll_state.size() + viewport_paintable.sticky_state.size());
for (auto& [_, scrollable_frame] : viewport_paintable.scroll_state) {
scroll_state[scrollable_frame->id] = scrollable_frame;
}
for (auto& [_, scrollable_frame] : viewport_paintable.sticky_state) {
scroll_state[scrollable_frame->id] = scrollable_frame;
}
display_list->set_scroll_state(move(scroll_state));