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4f6fc3d3a6
Before, querying any of the four intrinsic sizes would cause us to calculate all of them (the four being min-content width/height, and max-content width/height). Now, the helper functions only calculate the specific intrinsic size requested. It's then cached at the root formatting context level, so that it's never calculated twice within the same layout pass.
101 lines
3.6 KiB
C++
101 lines
3.6 KiB
C++
/*
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* Copyright (c) 2020-2022, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/OwnPtr.h>
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#include <LibWeb/Forward.h>
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#include <LibWeb/Layout/FormattingState.h>
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namespace Web::Layout {
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class FormattingContext {
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public:
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virtual ~FormattingContext();
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enum class Type {
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Block,
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Inline,
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Flex,
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Table,
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SVG,
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};
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virtual void run(Box const&, LayoutMode) = 0;
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Box const& context_box() const { return m_context_box; }
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FormattingContext* parent() { return m_parent; }
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FormattingContext const* parent() const { return m_parent; }
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Type type() const { return m_type; }
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bool is_block_formatting_context() const { return type() == Type::Block; }
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virtual bool inhibits_floating() const { return false; }
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static bool creates_block_formatting_context(Box const&);
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static float compute_width_for_replaced_element(FormattingState const&, ReplacedBox const&);
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static float compute_height_for_replaced_element(FormattingState const&, ReplacedBox const&);
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OwnPtr<FormattingContext> create_independent_formatting_context_if_needed(FormattingState&, Box const& child_box);
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virtual void parent_context_did_dimension_child_root_box() { }
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float calculate_min_content_width(Layout::Box const&) const;
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float calculate_max_content_width(Layout::Box const&) const;
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float calculate_min_content_height(Layout::Box const&) const;
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float calculate_max_content_height(Layout::Box const&) const;
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float calculate_fit_content_height(Layout::Box const&, Optional<float> available_height) const;
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float calculate_fit_content_width(Layout::Box const&, Optional<float> available_width) const;
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virtual float greatest_child_width(Box const&);
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protected:
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FormattingContext(Type, FormattingState&, Box const&, FormattingContext* parent = nullptr);
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float calculate_fit_content_size(float min_content_size, float max_content_size, Optional<float> available_space) const;
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OwnPtr<FormattingContext> layout_inside(Box const&, LayoutMode);
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void compute_inset(Box const& box);
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struct SpaceUsedByFloats {
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float left { 0 };
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float right { 0 };
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};
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struct ShrinkToFitResult {
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float preferred_width { 0 };
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float preferred_minimum_width { 0 };
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};
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static float tentative_width_for_replaced_element(FormattingState const&, ReplacedBox const&, CSS::Length const& width);
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static float tentative_height_for_replaced_element(FormattingState const&, ReplacedBox const&, CSS::Length const& height);
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static float compute_auto_height_for_block_formatting_context_root(FormattingState const&, BlockContainer const&);
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static float compute_auto_height_for_block_level_element(FormattingState const&, Box const&);
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static float calculate_auto_height(FormattingState const& state, Box const& box);
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ShrinkToFitResult calculate_shrink_to_fit_widths(Box const&);
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void layout_absolutely_positioned_element(Box const&);
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void compute_width_for_absolutely_positioned_element(Box const&);
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void compute_width_for_absolutely_positioned_non_replaced_element(Box const&);
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void compute_width_for_absolutely_positioned_replaced_element(ReplacedBox const&);
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void compute_height_for_absolutely_positioned_element(Box const&);
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void compute_height_for_absolutely_positioned_non_replaced_element(Box const&);
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void compute_height_for_absolutely_positioned_replaced_element(ReplacedBox const&);
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Type m_type {};
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FormattingContext* m_parent { nullptr };
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Box const& m_context_box;
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FormattingState& m_state;
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};
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}
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