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LibWeb: Make Layout::Node::containing_block() return a Layout::Box

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Containing blocks can be formed by boxes that aren't block containers,
so let's make this return a Box and work towards type correctness here.
This commit is contained in:
Andreas Kling 2023-01-23 14:59:51 +01:00
parent d5480a44e5
commit 51555dea7c
6 changed files with 42 additions and 30 deletions
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42
Userland/Libraries/LibWeb/Layout/Node.cpp
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@ -62,26 +62,36 @@ bool Node::can_contain_boxes_with_position_absolute() const
return computed_values().position() != CSS::Position::Static || is<InitialContainingBlock>(*this);
}
BlockContainer const* Node::containing_block() const
static Box const* nearest_ancestor_capable_of_forming_a_containing_block(Node const& node)
{
for (auto const* ancestor = node.parent(); ancestor; ancestor = ancestor->parent()) {
if (ancestor->is_block_container())
return verify_cast<Box>(ancestor);
}
return nullptr;
}
Box const* Node::containing_block() const
{
if (is<TextNode>(*this))
return first_ancestor_of_type<BlockContainer>();
return nearest_ancestor_capable_of_forming_a_containing_block(*this);
auto position = computed_values().position();
// https://drafts.csswg.org/css-position-3/#absolute-cb
if (position == CSS::Position::Absolute) {
auto* ancestor = parent();
auto const* ancestor = parent();
while (ancestor && !ancestor->can_contain_boxes_with_position_absolute())
ancestor = ancestor->parent();
while (ancestor && (!is<BlockContainer>(*ancestor) || ancestor->is_anonymous()))
ancestor = ancestor->containing_block();
while (ancestor && ancestor->is_anonymous())
ancestor = nearest_ancestor_capable_of_forming_a_containing_block(*ancestor);
return static_cast<BlockContainer const*>(ancestor);
}
if (position == CSS::Position::Fixed)
return &root();
return first_ancestor_of_type<BlockContainer>();
return nearest_ancestor_capable_of_forming_a_containing_block(*this);
}
// https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Positioning/Understanding_z_index/The_stacking_context
@ -158,7 +168,9 @@ void Node::set_needs_display()
return;
if (!containing_block->paint_box())
return;
containing_block->paint_box()->for_each_fragment([&](auto& fragment) {
if (!is<Painting::PaintableWithLines>(*containing_block->paint_box()))
return;
static_cast<Painting::PaintableWithLines const&>(*containing_block->paint_box()).for_each_fragment([&](auto& fragment) {
if (&fragment.layout_node() == this || is_ancestor_of(fragment.layout_node())) {
browsing_context().set_needs_display(fragment.absolute_rect());
}
@ -173,13 +185,15 @@ CSSPixelPoint Node::box_type_agnostic_position() const
VERIFY(is_inline());
CSSPixelPoint position;
if (auto* block = containing_block()) {
block->paint_box()->for_each_fragment([&](auto& fragment) {
if (&fragment.layout_node() == this || is_ancestor_of(fragment.layout_node())) {
position = fragment.absolute_rect().location();
return IterationDecision::Break;
}
return IterationDecision::Continue;
});
if (is<Painting::PaintableWithLines>(*block)) {
static_cast<Painting::PaintableWithLines const&>(*block->paint_box()).for_each_fragment([&](auto& fragment) {
if (&fragment.layout_node() == this || is_ancestor_of(fragment.layout_node())) {
position = fragment.absolute_rect().location();
return IterationDecision::Break;
}
return IterationDecision::Continue;
});
}
}
return position;
}