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LibWeb: Move line boxes from Layout::Box to BlockContainer

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Per the spec, only a BlockContainer" can have line boxes, so let's not
clutter up every Layout::Box with line boxes.

This also allows us to establish an invariant that BFC and IFC always
operate on a Layout::BlockContainer.

Note that if BlockContainer has all block-level children, its line boxes
are not used for anything. They are only used in the all inline-level
children scenario.
This commit is contained in:
Andreas Kling 2021-10-06 21:53:25 +02:00
parent a0bea52a5f
commit f73aa8e2bd
13 changed files with 80 additions and 74 deletions
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19
Userland/Libraries/LibWeb/Layout/BlockFormattingContext.h
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@ -8,6 +8,7 @@
#include <AK/Vector.h>
#include <LibWeb/Forward.h>
#include <LibWeb/Layout/BlockContainer.h>
#include <LibWeb/Layout/FormattingContext.h>
namespace Web::Layout {
@ -15,7 +16,7 @@ namespace Web::Layout {
// https://drafts.csswg.org/css-display/#block-formatting-context
class BlockFormattingContext : public FormattingContext {
public:
explicit BlockFormattingContext(Box&, FormattingContext* parent);
explicit BlockFormattingContext(BlockContainer&, FormattingContext* parent);
~BlockFormattingContext();
virtual void run(Box&, LayoutMode) override;
@ -25,12 +26,12 @@ public:
const Vector<Box*>& left_floating_boxes() const { return m_left_floating_boxes; }
const Vector<Box*>& right_floating_boxes() const { return m_right_floating_boxes; }
static float compute_theoretical_height(const Box&);
static float compute_theoretical_height(Box const&);
void compute_width(Box&);
// https://drafts.csswg.org/css-display/#block-formatting-context-root
Box& root() { return context_box(); }
Box const& root() const { return context_box(); }
BlockContainer& root() { return static_cast<BlockContainer&>(context_box()); }
BlockContainer const& root() const { return static_cast<BlockContainer const&>(context_box()); }
protected:
static void compute_height(Box&);
@ -45,13 +46,13 @@ private:
void layout_initial_containing_block(LayoutMode);
void layout_block_level_children(Box&, LayoutMode);
void layout_inline_children(Box&, LayoutMode);
void layout_block_level_children(BlockContainer&, LayoutMode);
void layout_inline_children(BlockContainer&, LayoutMode);
void place_block_level_replaced_element_in_normal_flow(Box& child, Box& container);
void place_block_level_non_replaced_element_in_normal_flow(Box& child, Box& container);
void place_block_level_replaced_element_in_normal_flow(Box& child, BlockContainer const&);
void place_block_level_non_replaced_element_in_normal_flow(Box& child, BlockContainer const&);
void layout_floating_child(Box&, Box& containing_block);
void layout_floating_child(Box& child, BlockContainer const& containing_block);
void apply_transformations_to_children(Box&);