mirror of
https://github.com/LadybirdBrowser/ladybird.git
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175 lines
8.3 KiB
C++
175 lines
8.3 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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Grid,
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Table,
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SVG,
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InternalReplaced, // Internal hack formatting context for replaced elements. FIXME: Get rid of this.
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InternalDummy, // Internal hack formatting context for unimplemented things. FIXME: Get rid of this.
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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 CSSPixels automatic_content_width() const = 0;
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// This function returns the automatic content height of the context's root box.
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virtual CSSPixels 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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[[nodiscard]] static Optional<Type> formatting_context_type_created_by_box(Box const&);
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static bool creates_block_formatting_context(Box const&);
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CSSPixels compute_table_box_width_inside_table_wrapper(Box const&, AvailableSpace const&);
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CSSPixels compute_table_box_height_inside_table_wrapper(Box const&, AvailableSpace const&);
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CSSPixels compute_width_for_replaced_element(Box const&, AvailableSpace const&) const;
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CSSPixels compute_height_for_replaced_element(Box const&, AvailableSpace const&) 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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CSSPixels calculate_min_content_width(Layout::Box const&) const;
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CSSPixels calculate_max_content_width(Layout::Box const&) const;
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CSSPixels calculate_min_content_height(Layout::Box const&, CSSPixels width) const;
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CSSPixels calculate_max_content_height(Layout::Box const&, CSSPixels width) const;
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CSSPixels calculate_fit_content_height(Layout::Box const&, AvailableSpace const&) const;
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CSSPixels calculate_fit_content_width(Layout::Box const&, AvailableSpace const&) const;
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CSSPixels calculate_inner_width(Layout::Box const&, AvailableSize const&, CSS::Size const& width) const;
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CSSPixels calculate_inner_height(Layout::Box const&, AvailableSize const&, CSS::Size const& height) const;
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virtual CSSPixels greatest_child_width(Box const&) const;
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[[nodiscard]] CSSPixelRect absolute_content_rect(Box const&) const;
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[[nodiscard]] CSSPixelRect absolute_content_rect(LayoutState::UsedValues const&) const;
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[[nodiscard]] CSSPixelRect margin_box_rect(Box const&) const;
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[[nodiscard]] CSSPixelRect margin_box_rect_in_ancestor_coordinate_space(Box const&, Box const& ancestor_box) const;
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[[nodiscard]] CSSPixelRect margin_box_rect(LayoutState::UsedValues const&) const;
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[[nodiscard]] CSSPixelRect margin_box_rect_in_ancestor_coordinate_space(LayoutState::UsedValues const&, Box const& ancestor_box) const;
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[[nodiscard]] CSSPixelRect border_box_rect(Box const&) const;
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[[nodiscard]] CSSPixelRect border_box_rect(LayoutState::UsedValues const&) const;
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[[nodiscard]] CSSPixelRect border_box_rect_in_ancestor_coordinate_space(Box const&, Box const& ancestor_box) const;
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[[nodiscard]] CSSPixelRect border_box_rect_in_ancestor_coordinate_space(LayoutState::UsedValues const&, Box const& ancestor_box) const;
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[[nodiscard]] CSSPixelRect content_box_rect(Box const&) const;
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[[nodiscard]] CSSPixelRect content_box_rect(LayoutState::UsedValues const&) const;
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[[nodiscard]] CSSPixelRect content_box_rect_in_ancestor_coordinate_space(Box const&, Box const& ancestor_box) const;
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[[nodiscard]] CSSPixelRect content_box_rect_in_ancestor_coordinate_space(LayoutState::UsedValues const&, Box const& ancestor_box) const;
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[[nodiscard]] CSSPixels box_baseline(Box const&) const;
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[[nodiscard]] CSSPixelRect content_box_rect_in_static_position_ancestor_coordinate_space(Box const&, Box const& ancestor_box) const;
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[[nodiscard]] CSSPixels containing_block_width_for(NodeWithStyleAndBoxModelMetrics const&) const;
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[[nodiscard]] CSSPixels containing_block_height_for(NodeWithStyleAndBoxModelMetrics const&) const;
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[[nodiscard]] AvailableSize containing_block_width_as_available_size(NodeWithStyleAndBoxModelMetrics const&) const;
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[[nodiscard]] AvailableSize containing_block_height_as_available_size(NodeWithStyleAndBoxModelMetrics const&) const;
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[[nodiscard]] CSSPixels calculate_stretch_fit_width(Box const&, AvailableSize const&) const;
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[[nodiscard]] CSSPixels calculate_stretch_fit_height(Box const&, AvailableSize const&) const;
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virtual CSSPixelPoint calculate_static_position(Box const&) const;
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bool can_skip_is_anonymous_text_run(Box&);
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void compute_inset(NodeWithStyleAndBoxModelMetrics const&);
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protected:
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FormattingContext(Type, LayoutState&, Box const&, FormattingContext* parent = nullptr);
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static bool should_treat_width_as_auto(Box const&, AvailableSpace const&);
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static bool should_treat_height_as_auto(Box const&, AvailableSpace const&);
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[[nodiscard]] bool should_treat_max_width_as_none(Box const&, AvailableSize const&) const;
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[[nodiscard]] bool should_treat_max_height_as_none(Box const&, AvailableSize const&) const;
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OwnPtr<FormattingContext> layout_inside(Box const&, LayoutMode, AvailableSpace const&);
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struct SpaceUsedByFloats {
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CSSPixels left { 0 };
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CSSPixels right { 0 };
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};
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struct SpaceUsedAndContainingMarginForFloats {
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// Width for left / right floats, including their own margins.
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CSSPixels left_used_space;
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CSSPixels right_used_space;
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// Left / right total margins from the outermost containing block to the floating element.
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// Each block in the containing chain adds its own margin and we store the total here.
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CSSPixels left_total_containing_margin;
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CSSPixels right_total_containing_margin;
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JS::GCPtr<Box const> matching_left_float_box;
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};
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struct ShrinkToFitResult {
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CSSPixels preferred_width { 0 };
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CSSPixels preferred_minimum_width { 0 };
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};
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CSSPixels tentative_width_for_replaced_element(Box const&, CSS::Size const& computed_width, AvailableSpace const&) const;
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CSSPixels tentative_height_for_replaced_element(Box const&, CSS::Size const& computed_height, AvailableSpace const&) const;
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CSSPixels compute_auto_height_for_block_formatting_context_root(Box const&) const;
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[[nodiscard]] CSSPixelSize solve_replaced_size_constraint(CSSPixels input_width, CSSPixels input_height, 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(Box const&, AvailableSpace const&);
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enum class BeforeOrAfterInsideLayout {
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Before,
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After,
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};
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void compute_height_for_absolutely_positioned_element(Box const&, AvailableSpace const&, BeforeOrAfterInsideLayout);
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void compute_height_for_absolutely_positioned_non_replaced_element(Box const&, AvailableSpace const&, BeforeOrAfterInsideLayout);
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void compute_height_for_absolutely_positioned_replaced_element(Box const&, AvailableSpace const&, BeforeOrAfterInsideLayout);
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[[nodiscard]] Optional<CSSPixels> compute_auto_height_for_absolutely_positioned_element(Box const&, AvailableSpace const&, BeforeOrAfterInsideLayout) const;
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[[nodiscard]] Box const* box_child_to_derive_baseline_from(Box const&) const;
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Type m_type {};
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FormattingContext* m_parent { nullptr };
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JS::NonnullGCPtr<Box const> m_context_box;
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LayoutState& m_state;
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};
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bool box_is_sized_as_replaced_element(Box const&);
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}
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