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b13a8706e1
After speaking with fantasai at CSSWG about this, it turns out I had misunderstood intrinsic heights. I originally believed all intrinsic sizes had to be computed with no influence from the surrounding context. As it turns out, intrinsic heights *are* influenced by the available width, since it's needed to determine where lines break. The APIs for calculating min-content and max-content heights now take the available width as inputs. This instantly improves layout in many cases where we'd previously make things way too wide.
122 lines
4.9 KiB
C++
122 lines
4.9 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/AvailableSpace.h>
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#include <LibWeb/Layout/LayoutState.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, AvailableSpace const&) = 0;
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// This function returns the automatic content height of the context's root box.
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virtual float automatic_content_width() const { return 0; }
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// This function returns the automatic content height of the context's root box.
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virtual float automatic_content_height() const = 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(LayoutState const&, ReplacedBox const&, AvailableSpace const&);
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static float compute_height_for_replaced_element(LayoutState const&, ReplacedBox const&, AvailableSpace const&);
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OwnPtr<FormattingContext> create_independent_formatting_context_if_needed(LayoutState&, 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&, AvailableSize const& available_width) const;
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float calculate_max_content_height(Layout::Box const&, AvailableSize const& available_width) const;
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float calculate_fit_content_height(Layout::Box const&, AvailableSpace const&) const;
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float calculate_fit_content_width(Layout::Box const&, AvailableSpace const&) const;
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virtual float greatest_child_width(Box const&);
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float containing_block_width_for(Box const& box) const { return containing_block_width_for(box, m_state); }
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float containing_block_height_for(Box const& box) const { return containing_block_height_for(box, m_state); }
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static float containing_block_width_for(Box const&, LayoutState const&);
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static float containing_block_height_for(Box const&, LayoutState const&);
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float compute_box_y_position_with_respect_to_siblings(Box const&) const;
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float calculate_stretch_fit_width(Box const&, AvailableSize const&) const;
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virtual bool can_determine_size_of_child() const { return false; }
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virtual void determine_width_of_child(Box const&, AvailableSpace const&) { }
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virtual void determine_height_of_child(Box const&, AvailableSpace const&) { }
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virtual Gfx::FloatPoint calculate_static_position(Box const&) const;
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protected:
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FormattingContext(Type, LayoutState&, Box const&, FormattingContext* parent = nullptr);
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float calculate_fit_content_size(float min_content_size, float max_content_size, AvailableSize const&) const;
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OwnPtr<FormattingContext> layout_inside(Box const&, LayoutMode, AvailableSpace const&);
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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(LayoutState const&, ReplacedBox const&, CSS::Size const& computed_width, AvailableSpace const&);
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static float tentative_height_for_replaced_element(LayoutState const&, ReplacedBox const&, CSS::Size const& computed_height, AvailableSpace const&);
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float compute_auto_height_for_block_formatting_context_root(BlockContainer const&) const;
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float compute_auto_height_for_block_level_element(Box const&, AvailableSpace const&) const;
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ShrinkToFitResult calculate_shrink_to_fit_widths(Box const&);
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void layout_absolutely_positioned_element(Box const&, AvailableSpace const&);
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void compute_width_for_absolutely_positioned_element(Box const&, AvailableSpace const&);
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void compute_width_for_absolutely_positioned_non_replaced_element(Box const&, AvailableSpace const&);
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void compute_width_for_absolutely_positioned_replaced_element(ReplacedBox const&, AvailableSpace const&);
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void compute_height_for_absolutely_positioned_element(Box const&, AvailableSpace const&);
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void compute_height_for_absolutely_positioned_non_replaced_element(Box const&, AvailableSpace const&);
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void compute_height_for_absolutely_positioned_replaced_element(ReplacedBox const&, AvailableSpace 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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LayoutState& m_state;
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};
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}
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