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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
View file

@ -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;
}

4
Userland/Libraries/LibWeb/Layout/Node.h
View file

@ -104,8 +104,8 @@ public:
bool is_flex_item() const { return m_is_flex_item; }
void set_flex_item(bool b) { m_is_flex_item = b; }
BlockContainer const* containing_block() const;
BlockContainer* containing_block() { return const_cast<BlockContainer*>(const_cast<Node const*>(this)->containing_block()); }
Box const* containing_block() const;
Box* containing_block() { return const_cast<Box*>(const_cast<Node const*>(this)->containing_block()); }
bool establishes_stacking_context() const;

2
Userland/Libraries/LibWeb/Painting/InlinePaintable.cpp
View file

@ -132,7 +132,7 @@ void InlinePaintable::for_each_fragment(Callback callback) const
{
// FIXME: This will be slow if the containing block has a lot of fragments!
Vector<Layout::LineBoxFragment const&> fragments;
containing_block()->paint_box()->for_each_fragment([&](auto& fragment) {
verify_cast<PaintableWithLines>(*containing_block()->paint_box()).for_each_fragment([&](auto& fragment) {
if (layout_node().is_inclusive_ancestor_of(fragment.layout_node()))
fragments.append(fragment);
return IterationDecision::Continue;

9
Userland/Libraries/LibWeb/Painting/Paintable.cpp
View file

@ -36,13 +36,16 @@ Paintable::DispatchEventOfSameName Paintable::handle_mousemove(Badge<EventHandle
bool Paintable::handle_mousewheel(Badge<EventHandler>, CSSPixelPoint, unsigned, unsigned, int wheel_delta_x, int wheel_delta_y)
{
if (auto* containing_block = this->containing_block()) {
if (!containing_block->is_scrollable())
if (!containing_block->is_block_container())
return false;
auto new_offset = containing_block->scroll_offset();
auto* scroll_container = static_cast<Layout::BlockContainer const*>(containing_block);
if (!scroll_container->is_scrollable())
return false;
auto new_offset = scroll_container->scroll_offset();
new_offset.translate_by(wheel_delta_x, wheel_delta_y);
// FIXME: This const_cast is gross.
// FIXME: Scroll offset shouldn't live in the layout tree.
const_cast<Layout::BlockContainer*>(containing_block)->set_scroll_offset(new_offset);
const_cast<Layout::BlockContainer*>(scroll_container)->set_scroll_offset(new_offset);
return true;
}

4
Userland/Libraries/LibWeb/Painting/Paintable.h
View file

@ -121,7 +121,7 @@ public:
void set_needs_display() const { const_cast<Layout::Node&>(*m_layout_node).set_needs_display(); }
Layout::BlockContainer const* containing_block() const
Layout::Box const* containing_block() const
{
if (!m_containing_block.has_value())
m_containing_block = m_layout_node->containing_block();
@ -141,7 +141,7 @@ protected:
private:
JS::NonnullGCPtr<Layout::Node> m_layout_node;
Optional<JS::GCPtr<Layout::BlockContainer>> mutable m_containing_block;
Optional<JS::GCPtr<Layout::Box>> mutable m_containing_block;
};
inline DOM::Node* HitTestResult::dom_node()

11
Userland/Libraries/LibWeb/Painting/PaintableBox.cpp
View file

@ -75,14 +75,9 @@ void PaintableBox::set_content_size(CSSPixelSize size)
CSSPixelPoint PaintableBox::effective_offset() const
{
CSSPixelPoint offset;
if (m_containing_line_box_fragment.has_value()) {
// FIXME: This is a hack to deal with situations where the layout tree has been garbage collected.
// We could avoid this by making the paintable tree garbage collected as well.
if (!containing_block() || !containing_block()->paint_box())
return offset;
auto const& fragment = containing_block()->paint_box()->line_boxes()[m_containing_line_box_fragment->line_box_index].fragments()[m_containing_line_box_fragment->fragment_index];
if (containing_block() && m_containing_line_box_fragment.has_value()) {
auto& paintable_with_lines = *verify_cast<PaintableWithLines>(containing_block()->paint_box());
auto const& fragment = paintable_with_lines.line_boxes()[m_containing_line_box_fragment->line_box_index].fragments()[m_containing_line_box_fragment->fragment_index];
offset = fragment.offset();
} else {
offset = m_offset;