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LibWeb: Add some basic paint tree traversal helpers

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Give the Paintable class some basic helpers for traversing the paint
tree. Note that they actually piggy-back on the layout tree for links
between nodes.
This commit is contained in:
Andreas Kling 2022-04-08 15:19:02 +02:00
parent 40f090c7e8
commit dcbb83a33e
2 changed files with 49 additions and 0 deletions
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16
Userland/Libraries/LibWeb/Painting/Paintable.cpp
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@ -46,4 +46,20 @@ Optional<HitTestResult> Paintable::hit_test(Gfx::FloatPoint const&, HitTestType)
return {};
}
Paintable const* Paintable::first_child() const
{
auto* layout_child = m_layout_node.first_child();
for (; layout_child && !layout_child->paintable(); layout_child = layout_child->next_sibling())
;
return layout_child ? layout_child->paintable() : nullptr;
}
Paintable const* Paintable::next_sibling() const
{
auto* layout_node = m_layout_node.next_sibling();
for (; layout_node && !layout_node->paintable(); layout_node = layout_node->next_sibling())
;
return layout_node ? layout_node->paintable() : nullptr;
}
}