3f2b17f602
FormattingContext can now calculate the intrinsic sizes (min-content and max-content in both axes) for a given Layout::Box. This is a rather expensive operation, as it necessitates performing two throwaway layouts of the subtree rooted at the box. Fortunately, we can cache the results of these calculations, as intrinsic sizes don't change based on other context around the box. They are intrinsic after all. :^)
96 lines
3.5 KiB
C++
96 lines
3.5 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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const FormattingContext* 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(const Box&);
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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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struct MinAndMaxContentSize {
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float min_content_size { 0 };
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float max_content_size { 0 };
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};
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MinAndMaxContentSize calculate_min_and_max_content_width(Layout::Box const&) const;
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MinAndMaxContentSize calculate_min_and_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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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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FormattingState::IntrinsicSizes calculate_intrinsic_sizes(Layout::Box const&) const;
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OwnPtr<FormattingContext> layout_inside(Box const&, LayoutMode);
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void compute_position(Box const&);
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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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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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