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- /*
- * Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
- #pragma once
- #include <AK/HashMap.h>
- #include <LibGfx/Point.h>
- #include <LibWeb/Layout/Box.h>
- #include <LibWeb/Layout/LineBox.h>
- #include <LibWeb/Painting/PaintableBox.h>
- namespace Web::Layout {
- enum class SizeConstraint {
- None,
- MinContent,
- MaxContent,
- };
- class AvailableSize;
- class AvailableSpace;
- struct LayoutState {
- LayoutState()
- : m_root(*this)
- {
- }
- explicit LayoutState(LayoutState const* parent)
- : m_parent(parent)
- , m_root(find_root())
- {
- used_values_per_layout_node.resize(m_root.used_values_per_layout_node.size());
- }
- LayoutState const& find_root() const
- {
- LayoutState const* root = this;
- for (auto* state = m_parent; state; state = state->m_parent)
- root = state;
- return *root;
- }
- struct UsedValues {
- NodeWithStyleAndBoxModelMetrics const& node() const { return *m_node; }
- void set_node(NodeWithStyleAndBoxModelMetrics&, UsedValues const* containing_block_used_values);
- float content_width() const { return m_content_width; }
- float content_height() const { return m_content_height; }
- void set_content_width(float);
- void set_content_height(float);
- bool has_definite_width() const { return m_has_definite_width && width_constraint == SizeConstraint::None; }
- bool has_definite_height() const { return m_has_definite_height && height_constraint == SizeConstraint::None; }
- // Returns the available space for content inside this layout box.
- // If the space in an axis is indefinite, and the outer space is an intrinsic sizing constraint,
- // the constraint is used in that axis instead.
- AvailableSpace available_inner_space_or_constraints_from(AvailableSpace const& outer_space) const;
- void set_content_offset(Gfx::FloatPoint);
- void set_content_x(float);
- void set_content_y(float);
- Gfx::FloatPoint offset;
- SizeConstraint width_constraint { SizeConstraint::None };
- SizeConstraint height_constraint { SizeConstraint::None };
- float margin_left { 0 };
- float margin_right { 0 };
- float margin_top { 0 };
- float margin_bottom { 0 };
- float border_left { 0 };
- float border_right { 0 };
- float border_top { 0 };
- float border_bottom { 0 };
- float padding_left { 0 };
- float padding_right { 0 };
- float padding_top { 0 };
- float padding_bottom { 0 };
- float inset_left { 0 };
- float inset_right { 0 };
- float inset_top { 0 };
- float inset_bottom { 0 };
- Vector<LineBox> line_boxes;
- float margin_box_left() const { return margin_left + border_left + padding_left; }
- float margin_box_right() const { return margin_right + border_right + padding_right; }
- float margin_box_top() const { return margin_top + border_top + padding_top; }
- float margin_box_bottom() const { return margin_bottom + border_bottom + padding_bottom; }
- float margin_box_width() const { return margin_box_left() + content_width() + margin_box_right(); }
- float margin_box_height() const { return margin_box_top() + content_height() + margin_box_bottom(); }
- float border_box_left() const { return border_left + padding_left; }
- float border_box_right() const { return border_right + padding_right; }
- float border_box_top() const { return border_top + padding_top; }
- float border_box_bottom() const { return border_bottom + padding_bottom; }
- float border_box_width() const { return border_box_left() + content_width() + border_box_right(); }
- float border_box_height() const { return border_box_top() + content_height() + border_box_bottom(); }
- Optional<Painting::PaintableBox::OverflowData> overflow_data;
- Painting::PaintableBox::OverflowData& ensure_overflow_data()
- {
- if (!overflow_data.has_value())
- overflow_data = Painting::PaintableBox::OverflowData {};
- return *overflow_data;
- }
- Optional<LineBoxFragmentCoordinate> containing_line_box_fragment;
- void add_floating_descendant(Box const& box) { m_floating_descendants.set(&box); }
- auto const& floating_descendants() const { return m_floating_descendants; }
- private:
- AvailableSize available_width_inside() const;
- AvailableSize available_height_inside() const;
- Layout::NodeWithStyleAndBoxModelMetrics* m_node { nullptr };
- float m_content_width { 0 };
- float m_content_height { 0 };
- bool m_has_definite_width { false };
- bool m_has_definite_height { false };
- HashTable<Box const*> m_floating_descendants;
- };
- float resolved_definite_width(Box const&) const;
- float resolved_definite_height(Box const&) const;
- void commit();
- // NOTE: get_mutable() will CoW the UsedValues if it's inherited from an ancestor state;
- UsedValues& get_mutable(NodeWithStyleAndBoxModelMetrics const&);
- // NOTE: get() will not CoW the UsedValues.
- UsedValues const& get(NodeWithStyleAndBoxModelMetrics const&) const;
- Vector<OwnPtr<UsedValues>> used_values_per_layout_node;
- // We cache intrinsic sizes once determined, as they will not change over the course of a full layout.
- // This avoids computing them several times while performing flex layout.
- struct IntrinsicSizes {
- Optional<float> min_content_width;
- Optional<float> max_content_width;
- Optional<float> min_content_height;
- Optional<float> max_content_height;
- };
- HashMap<NodeWithStyleAndBoxModelMetrics const*, NonnullOwnPtr<IntrinsicSizes>> mutable intrinsic_sizes;
- LayoutState const* m_parent { nullptr };
- LayoutState const& m_root;
- };
- Gfx::FloatRect absolute_content_rect(Box const&, LayoutState const&);
- Gfx::FloatRect margin_box_rect(Box const&, LayoutState const&);
- Gfx::FloatRect margin_box_rect_in_ancestor_coordinate_space(Box const& box, Box const& ancestor_box, LayoutState const&);
- Gfx::FloatRect border_box_rect(Box const&, LayoutState const&);
- Gfx::FloatRect border_box_rect_in_ancestor_coordinate_space(Box const& box, Box const& ancestor_box, LayoutState const&);
- Gfx::FloatRect content_box_rect(Box const&, LayoutState const&);
- Gfx::FloatRect content_box_rect_in_ancestor_coordinate_space(Box const& box, Box const& ancestor_box, LayoutState const&);
- }
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