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LibWeb: Move available_space_for_line() from IFC to BFC

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This is preparation for allowing blocks with their own internal BFC to
flow around floating boxes in the parent BFC.

Note that IFC still has the available_space_for_line() API, which
returns space available within the IFC's own containing block, while the
BFC available_space_for_line() returns space available within its root.
This commit is contained in:
Andreas Kling 2022-03-17 12:30:30 +01:00
parent fc6b7fcd97
commit ef8a72ff3f
5 changed files with 36 additions and 32 deletions
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25
Userland/Libraries/LibWeb/Layout/BlockFormattingContext.cpp
View file

@ -692,4 +692,29 @@ void BlockFormattingContext::layout_list_item_marker(ListItemBox const& list_ite
list_item_state.content_height = marker_state.content_height;
}
BlockFormattingContext::AvailableSpaceForLineInfo BlockFormattingContext::available_space_for_line(float y) const
{
AvailableSpaceForLineInfo info;
for (auto const& floating_box : m_left_floats.boxes.in_reverse()) {
auto rect = margin_box_rect_in_ancestor_coordinate_space(floating_box, root(), m_state);
if (rect.contains_vertically(y)) {
info.left = rect.right() + 1;
break;
}
}
info.right = m_state.get(root()).content_width;
for (auto const& floating_box : m_right_floats.boxes.in_reverse()) {
auto rect = margin_box_rect_in_ancestor_coordinate_space(floating_box, root(), m_state);
if (rect.contains_vertically(y)) {
info.right = rect.left();
break;
}
}
return info;
}
}

2
Userland/Libraries/LibWeb/Layout/BlockFormattingContext.h
View file

@ -38,6 +38,8 @@ public:
void add_absolutely_positioned_box(Box const& box) { m_absolutely_positioned_boxes.append(box); }
AvailableSpaceForLineInfo available_space_for_line(float y) const;
private:
virtual bool is_block_formatting_context() const final { return true; }

5
Userland/Libraries/LibWeb/Layout/FormattingContext.h
View file

@ -65,6 +65,11 @@ protected:
OwnPtr<FormattingContext> layout_inside(Box const&, LayoutMode);
void compute_position(Box const&);
struct AvailableSpaceForLineInfo {
float left { 0 };
float right { 0 };
};
struct ShrinkToFitResult {
float preferred_width { 0 };
float preferred_minimum_width { 0 };

31
Userland/Libraries/LibWeb/Layout/InlineFormattingContext.cpp
View file

@ -36,37 +36,14 @@ BlockFormattingContext const& InlineFormattingContext::parent() const
return static_cast<BlockFormattingContext const&>(*FormattingContext::parent());
}
InlineFormattingContext::AvailableSpaceForLineInfo InlineFormattingContext::available_space_for_line(float y) const
FormattingContext::AvailableSpaceForLineInfo InlineFormattingContext::available_space_for_line(float y) const
{
// NOTE: Floats are relative to the BFC root box, not necessarily the containing block of this IFC.
auto box_in_root_rect = margin_box_rect_in_ancestor_coordinate_space(containing_block(), parent().root(), m_state);
float y_in_root = box_in_root_rect.y() + y;
AvailableSpaceForLineInfo info;
auto const& bfc = parent();
for (ssize_t i = bfc.left_side_floats().boxes.size() - 1; i >= 0; --i) {
auto const& floating_box = bfc.left_side_floats().boxes.at(i);
auto rect = margin_box_rect_in_ancestor_coordinate_space(floating_box, parent().root(), m_state);
if (rect.contains_vertically(y_in_root)) {
info.left = rect.right() + 1;
break;
}
}
info.right = m_state.get(containing_block()).content_width;
for (ssize_t i = bfc.right_side_floats().boxes.size() - 1; i >= 0; --i) {
auto const& floating_box = bfc.right_side_floats().boxes.at(i);
auto rect = margin_box_rect_in_ancestor_coordinate_space(floating_box, parent().root(), m_state);
if (rect.contains_vertically(y_in_root)) {
info.right = rect.left();
break;
}
}
return info;
auto space = parent().available_space_for_line(y_in_root);
space.right = min(space.right, m_state.get(containing_block()).content_width);
return space;
}
void InlineFormattingContext::run(Box const&, LayoutMode layout_mode)

5
Userland/Libraries/LibWeb/Layout/InlineFormattingContext.h
View file

@ -27,11 +27,6 @@ public:
void dimension_box_on_line(Box const&, LayoutMode);
struct AvailableSpaceForLineInfo {
float left { 0 };
float right { 0 };
};
AvailableSpaceForLineInfo available_space_for_line(float y) const;
private: