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LibWeb: Account for scroll offset in hit-testing

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The hit-testing position is now shifted by the scroll offsets before
performing any checks for containment. This is implemented by assigning
each PaintableBox/InlinePaintable an offset corresponding to the scroll
frame in which it is contained. The non-scroll-adjusted position is
still passed down when recursing to children because the assigned
offset accumulated for nested scroll frames.

With this change, hit testing works in the Inspector.
Fixes https://github.com/SerenityOS/serenity/issues/22068
This commit is contained in:
Aliaksandr Kalenik 2024-01-29 06:28:17 +01:00 • committed by Andreas Kling
parent beb1c85b6b
commit 556679fedd
7 changed files with 81 additions and 10 deletions
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2
Userland/Libraries/LibWeb/Painting/ViewportPaintable.cpp
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@ -82,9 +82,11 @@ void ViewportPaintable::assign_scroll_frame_ids(HashMap<Painting::PaintableBox c
if (paintable.is_paintable_box()) {
auto const& paintable_box = static_cast<PaintableBox const&>(paintable);
const_cast<PaintableBox&>(paintable_box).set_scroll_frame_id(scroll_frame_id->id);
const_cast<PaintableBox&>(paintable_box).set_enclosing_scroll_frame_offset(scroll_frame_id->offset);
} else if (paintable.is_inline_paintable()) {
auto const& inline_paintable = static_cast<InlinePaintable const&>(paintable);
const_cast<InlinePaintable&>(inline_paintable).set_scroll_frame_id(scroll_frame_id->id);
const_cast<InlinePaintable&>(inline_paintable).set_enclosing_scroll_frame_offset(scroll_frame_id->offset);
}
break;
}